draw usage graphs

app/src/main/java/sh/sar/gridflow/data/Models.kt

@@ -45,3 +45,76 @@ data class ValidationError(
     val param: String,
     val location: String
 )
+
+// New models for customer subscriptions and usage
+data class CustomerSubscription(
+    val id: Long,
+    val name: String,
+    val subscriptionId: Long,
+    val createdAt: String,
+    val deletedAt: String?,
+    val customerId: Long,
+    val subscription: SubscriptionDetails
+)
+
+data class SubscriptionDetails(
+    val id: Long,
+    val subscriptionNumber: String,
+    val status: String,
+    val serviceId: Int, // 1 = Electrical, 2 = Water
+    val hasSmartMeter: Boolean,
+    val category: ServiceCategory,
+    val customer: Customer,
+    val lastBill: LastBill?
+)
+
+data class ServiceCategory(
+    val id: Int,
+    val name: String, // "Domestic", "Business", etc.
+    val code: String,
+    val mainCategory: MainCategory
+)
+
+data class MainCategory(
+    val id: Int,
+    val name: String,
+    val code: String
+)
+
+data class Customer(
+    val id: Long,
+    val name: String,
+    val accountNumber: String,
+    val phone: String
+)
+
+data class LastBill(
+    val id: Long,
+    val billNumber: String,
+    val billAmount: String,
+    val billedUnits: String,
+    val dueDate: String,
+    val billDate: String,
+    val status: String,
+    val type: String
+)
+
+data class UsageReading(
+    val meter: MeterReading,
+    val currentReadingDate: String
+)
+
+data class MeterReading(
+    val currentUnits: String,
+    val currentReadingDate: String
+)
+
+// Outstanding bills data model
+data class OutstandingBill(
+    val id: Long,
+    val billNumber: String,
+    val billAmount: String,
+    val dueDate: String,
+    val subscriptionId: Long,
+    val serviceId: Int
+)

app/src/main/java/sh/sar/gridflow/network/FenakaApiService.kt

@@ -8,13 +8,16 @@ import okhttp3.*
 import okhttp3.MediaType.Companion.toMediaType
 import okhttp3.RequestBody.Companion.toRequestBody
 import okhttp3.logging.HttpLoggingInterceptor
+import sh.sar.gridflow.data.CustomerSubscription
 import sh.sar.gridflow.data.ErrorResponse
 import sh.sar.gridflow.data.ForgotPasswordRequest
 import sh.sar.gridflow.data.ForgotPasswordResponse
 import sh.sar.gridflow.data.LoginRequest
 import sh.sar.gridflow.data.LoginResponse
+import sh.sar.gridflow.data.OutstandingBill
 import sh.sar.gridflow.data.SignupRequest
 import sh.sar.gridflow.data.SignupResponse
+import sh.sar.gridflow.data.UsageReading
 import java.io.IOException
 
 class FenakaApiService {
@@ -221,9 +224,9 @@ class FenakaApiService {
         }
     }
     
-    suspend fun getOutstandingBills(cookie: String): ApiResult<List<Any>> = withContext(Dispatchers.IO) {
+    suspend fun getCustomerSubscriptions(cookie: String): ApiResult<List<CustomerSubscription>> = withContext(Dispatchers.IO) {
         val request = Request.Builder()
-            .url("$BASE_URL/saiph/subscriptions/summaries/outstanding")
+            .url("$BASE_URL/api/customer-subscriptions")
             .get()
             .header("Authorization", "Bearer $BEARER_TOKEN")
             .header("Content-Type", "application/json")
@@ -237,12 +240,11 @@ class FenakaApiService {
             when (response.code) {
                 200 -> {
                     val responseBody = response.body?.string() ?: "[]"
-                    // For now, we just need to know if it's empty or not
-                    val bills = gson.fromJson(responseBody, Array<Any>::class.java).toList()
-                    ApiResult.Success(bills, null)
+                    val subscriptions = gson.fromJson(responseBody, Array<CustomerSubscription>::class.java).toList()
+                    ApiResult.Success(subscriptions, null)
                 }
                 else -> {
-                    ApiResult.Error("Failed to fetch outstanding bills", response.code)
+                    ApiResult.Error("Failed to fetch customer subscriptions", response.code)
                 }
             }
         } catch (e: IOException) {
@@ -251,6 +253,84 @@ class FenakaApiService {
             ApiResult.Error("Unexpected error: ${e.message}", -1)
         }
     }
+    
+    suspend fun getSubscriptionUsage(subscriptionId: Long, cookie: String): ApiResult<List<UsageReading>> = withContext(Dispatchers.IO) {
+        Log.d(TAG, "Fetching usage for subscription: $subscriptionId")
+        
+        val request = Request.Builder()
+            .url("$BASE_URL/api/customer-subscriptions/$subscriptionId/billed-readings")
+            .get()
+            .header("Authorization", "Bearer $BEARER_TOKEN")
+            .header("Content-Type", "application/json")
+            .header("Cookie", cookie)
+            .header("Host", "api.fenaka.mv")
+            .header("User-Agent", "Dart/3.3 (dart:io)")
+            .build()
+        
+        try {
+            val response = client.newCall(request).execute()
+            Log.d(TAG, "Usage response code: ${response.code}")
+            
+            when (response.code) {
+                200 -> {
+                    val responseBody = response.body?.string() ?: "[]"
+                    Log.d(TAG, "Usage response body: $responseBody")
+                    val usageReadings = gson.fromJson(responseBody, Array<UsageReading>::class.java).toList()
+                    Log.d(TAG, "Parsed ${usageReadings.size} usage readings")
+                    ApiResult.Success(usageReadings, null)
+                }
+                else -> {
+                    Log.d(TAG, "Failed to fetch usage: ${response.code}")
+                    ApiResult.Error("Failed to fetch subscription usage", response.code)
+                }
+            }
+        } catch (e: IOException) {
+            Log.e(TAG, "Network error during usage fetch", e)
+            ApiResult.Error("Network error: ${e.message}", -1)
+        } catch (e: Exception) {
+            Log.e(TAG, "Unexpected error during usage fetch", e)
+            ApiResult.Error("Unexpected error: ${e.message}", -1)
+        }
+    }
+    
+    suspend fun getOutstandingBills(cookie: String): ApiResult<List<OutstandingBill>> = withContext(Dispatchers.IO) {
+        Log.d(TAG, "Fetching outstanding bills")
+        
+        val request = Request.Builder()
+            .url("$BASE_URL/saiph/subscriptions/summaries/outstanding")
+            .get()
+            .header("Authorization", "Bearer $BEARER_TOKEN")
+            .header("Content-Type", "application/json")
+            .header("Cookie", cookie)
+            .header("Host", "api.fenaka.mv")
+            .header("User-Agent", "Dart/3.3 (dart:io)")
+            .build()
+        
+        try {
+            val response = client.newCall(request).execute()
+            Log.d(TAG, "Outstanding bills response code: ${response.code}")
+            
+            when (response.code) {
+                200 -> {
+                    val responseBody = response.body?.string() ?: "[]"
+                    Log.d(TAG, "Outstanding bills response: $responseBody")
+                    val bills = gson.fromJson(responseBody, Array<OutstandingBill>::class.java).toList()
+                    Log.d(TAG, "Found ${bills.size} outstanding bills")
+                    ApiResult.Success(bills, null)
+                }
+                else -> {
+                    Log.d(TAG, "Failed to fetch outstanding bills: ${response.code}")
+                    ApiResult.Error("Failed to fetch outstanding bills", response.code)
+                }
+            }
+        } catch (e: IOException) {
+            Log.e(TAG, "Network error during bills fetch", e)
+            ApiResult.Error("Network error: ${e.message}", -1)
+        } catch (e: Exception) {
+            Log.e(TAG, "Unexpected error during bills fetch", e)
+            ApiResult.Error("Unexpected error: ${e.message}", -1)
+        }
+    }
 }
 
 sealed class ApiResult<T> {

app/src/main/java/sh/sar/gridflow/ui/home/HomeFragment.kt

@@ -4,57 +4,159 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.TextView
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.ViewModelProvider
+import androidx.recyclerview.widget.LinearLayoutManager
+import sh.sar.gridflow.data.CustomerSubscription
 import sh.sar.gridflow.databinding.FragmentHomeBinding
 
 class HomeFragment : Fragment() {
 
     private var _binding: FragmentHomeBinding? = null
-
-    // This property is only valid between onCreateView and
-    // onDestroyView.
     private val binding get() = _binding!!
+    
+    private lateinit var homeViewModel: HomeViewModel
+    private lateinit var subscriptionsAdapter: SubscriptionsAdapter
+    private var selectedSubscriptionId: Long? = null
 
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View {
-        val homeViewModel =
-            ViewModelProvider(this, ViewModelProvider.AndroidViewModelFactory.getInstance(requireActivity().application))
-                .get(HomeViewModel::class.java)
-
         _binding = FragmentHomeBinding.inflate(inflater, container, false)
-        val root: View = binding.root
-
-        val welcomeTextView: TextView = binding.textHome
-        val billsStatusTextView: TextView = binding.textBillsStatus
-        val progressBar = binding.progressBills
         
-        homeViewModel.welcomeText.observe(viewLifecycleOwner) {
-            welcomeTextView.text = it
+        homeViewModel = ViewModelProvider(
+            this,
+            ViewModelProvider.AndroidViewModelFactory.getInstance(requireActivity().application)
+        ).get(HomeViewModel::class.java)
+        
+        setupViews()
+        setupObservers()
+        
+        return binding.root
+    }
+    
+    private fun setupViews() {
+        // Setup subscriptions RecyclerView
+        subscriptionsAdapter = SubscriptionsAdapter { subscription ->
+            // When subscription is clicked, load its usage chart
+            selectedSubscriptionId = subscription.id
+            subscriptionsAdapter.setSelectedSubscription(subscription.id)
+            homeViewModel.loadUsageChart(subscription.id)
+            updateSelectedSubscriptionInfo(subscription)
         }
         
-        homeViewModel.billsStatus.observe(viewLifecycleOwner) {
-            billsStatusTextView.text = it
+        binding.recyclerSubscriptions.apply {
+            layoutManager = LinearLayoutManager(requireContext())
+            adapter = subscriptionsAdapter
+        }
+    }
+    
+    private fun setupObservers() {
+        // Welcome text
+        homeViewModel.welcomeText.observe(viewLifecycleOwner) { text ->
+            binding.textHome.text = text
         }
         
-        homeViewModel.isLoading.observe(viewLifecycleOwner) { isLoading ->
+        // Bills status
+        homeViewModel.billsStatus.observe(viewLifecycleOwner) { status ->
+            binding.textBillsStatus.text = status
+        }
+        
+        homeViewModel.isLoadingBills.observe(viewLifecycleOwner) { isLoading ->
+            binding.progressBills.visibility = if (isLoading) View.VISIBLE else View.GONE
             if (isLoading) {
-                progressBar.visibility = View.VISIBLE
-                billsStatusTextView.text = "Checking bills status..."
-            } else {
-                progressBar.visibility = View.GONE
+                binding.textBillsStatus.text = "Checking bills status..."
             }
         }
         
-        return root
+        // Subscriptions
+        homeViewModel.subscriptions.observe(viewLifecycleOwner) { subscriptions ->
+            subscriptionsAdapter.updateSubscriptions(subscriptions)
+        }
+        
+        homeViewModel.isLoadingSubscriptions.observe(viewLifecycleOwner) { isLoading ->
+            binding.progressSubscriptions.visibility = if (isLoading) View.VISIBLE else View.GONE
+            binding.recyclerSubscriptions.visibility = if (isLoading) View.GONE else View.VISIBLE
+        }
+        
+        homeViewModel.subscriptionsError.observe(viewLifecycleOwner) { error ->
+            if (error != null) {
+                binding.textSubscriptionsError.visibility = View.VISIBLE
+                binding.textSubscriptionsError.text = error
+                binding.recyclerSubscriptions.visibility = View.GONE
+            } else {
+                binding.textSubscriptionsError.visibility = View.GONE
+                binding.recyclerSubscriptions.visibility = View.VISIBLE
+            }
+        }
+        
+        // Chart data
+        homeViewModel.chartData.observe(viewLifecycleOwner) { chartData ->
+            val unit = homeViewModel.chartUnit.value ?: "Units"
+            val serviceType = homeViewModel.chartServiceType.value ?: "Unknown"
+            
+            binding.chartUsage.setData(chartData, unit, serviceType)
+            binding.chartUsage.visibility = View.VISIBLE
+            
+            // Update chart title
+            binding.textChartTitle.text = "$serviceType Usage"
+            
+            // Show chart legend
+            binding.layoutChartLegend.visibility = View.VISIBLE
+            binding.textChartUnit.text = unit
+            
+            // Hide other states
+            binding.layoutChartEmpty.visibility = View.GONE
+            binding.layoutChartError.visibility = View.GONE
+            binding.layoutChartLoading.visibility = View.GONE
+        }
+        
+        homeViewModel.isLoadingChart.observe(viewLifecycleOwner) { isLoading ->
+            if (isLoading) {
+                binding.layoutChartLoading.visibility = View.VISIBLE
+                binding.chartUsage.visibility = View.GONE
+                binding.layoutChartEmpty.visibility = View.GONE
+                binding.layoutChartError.visibility = View.GONE
+                binding.layoutChartLegend.visibility = View.GONE
+            }
+        }
+        
+        homeViewModel.chartError.observe(viewLifecycleOwner) { error ->
+            if (error != null) {
+                binding.layoutChartError.visibility = View.VISIBLE
+                binding.textChartError.text = error
+                binding.chartUsage.visibility = View.GONE
+                binding.layoutChartEmpty.visibility = View.GONE
+                binding.layoutChartLoading.visibility = View.GONE
+                binding.layoutChartLegend.visibility = View.GONE
+            }
+        }
+        
+        homeViewModel.chartUnit.observe(viewLifecycleOwner) { unit ->
+            binding.textChartUnit.text = unit
+        }
+    }
+    
+    private fun updateSelectedSubscriptionInfo(subscription: CustomerSubscription) {
+        // Show the selected subscription info
+        binding.layoutSelectedSubscription.visibility = View.VISIBLE
+        
+        // Set service icon
+        val icon = when (subscription.subscription.serviceId) {
+            1 -> "⚡" // Electrical
+            2 -> "💧" // Water
+            else -> "🔌" // Unknown
+        }
+        binding.textSelectedIcon.text = icon
+        
+        // Set subscription name (shortened)
+        binding.textSelectedName.text = subscription.name
     }
 
     override fun onDestroyView() {
         super.onDestroyView()
         _binding = null
     }
-}
+}

app/src/main/java/sh/sar/gridflow/ui/home/HomeViewModel.kt

@@ -7,9 +7,14 @@ import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.launch
+import sh.sar.gridflow.data.CustomerSubscription
+import sh.sar.gridflow.data.UsageReading
 import sh.sar.gridflow.network.ApiResult
 import sh.sar.gridflow.network.FenakaApiService
+import sh.sar.gridflow.ui.widgets.ChartDataPoint
 import sh.sar.gridflow.utils.SecureStorage
+import java.text.SimpleDateFormat
+import java.util.*
 
 class HomeViewModel(application: Application) : AndroidViewModel(application) {
 
@@ -26,17 +31,47 @@ class HomeViewModel(application: Application) : AndroidViewModel(application) {
     private val _billsStatus = MutableLiveData<String>()
     val billsStatus: LiveData<String> = _billsStatus
     
-    private val _isLoading = MutableLiveData<Boolean>()
-    val isLoading: LiveData<Boolean> = _isLoading
+    private val _isLoadingBills = MutableLiveData<Boolean>()
+    val isLoadingBills: LiveData<Boolean> = _isLoadingBills
+    
+    // Subscriptions
+    private val _subscriptions = MutableLiveData<List<CustomerSubscription>>()
+    val subscriptions: LiveData<List<CustomerSubscription>> = _subscriptions
+    
+    private val _isLoadingSubscriptions = MutableLiveData<Boolean>()
+    val isLoadingSubscriptions: LiveData<Boolean> = _isLoadingSubscriptions
+    
+    private val _subscriptionsError = MutableLiveData<String?>()
+    val subscriptionsError: LiveData<String?> = _subscriptionsError
+    
+    // Usage Chart
+    private val _chartData = MutableLiveData<List<ChartDataPoint>>()
+    val chartData: LiveData<List<ChartDataPoint>> = _chartData
+    
+    private val _chartUnit = MutableLiveData<String>()
+    val chartUnit: LiveData<String> = _chartUnit
+    
+    private val _chartServiceType = MutableLiveData<String>()
+    val chartServiceType: LiveData<String> = _chartServiceType
+    
+    private val _isLoadingChart = MutableLiveData<Boolean>()
+    val isLoadingChart: LiveData<Boolean> = _isLoadingChart
+    
+    private val _chartError = MutableLiveData<String?>()
+    val chartError: LiveData<String?> = _chartError
+    
+    private val dateFormatter = SimpleDateFormat("yyyy-MM-dd", Locale.getDefault())
     
     init {
         Log.d(TAG, "HomeViewModel initialized")
         loadUserData()
         checkOutstandingBills()
+        loadCustomerSubscriptions()
     }
     
     private fun loadUserData() {
-        val userName = secureStorage.getUserName() ?: "User"
+        val activeAccount = secureStorage.getActiveAccount()
+        val userName = activeAccount?.name ?: "User"
         Log.d(TAG, "Loading user data: $userName")
         _welcomeText.value = "Welcome\n$userName"
     }
@@ -52,14 +87,14 @@ class HomeViewModel(application: Application) : AndroidViewModel(application) {
             return
         }
         
-        _isLoading.value = true
+        _isLoadingBills.value = true
         
         viewModelScope.launch {
             Log.d(TAG, "Making API call to check outstanding bills")
             when (val result = apiService.getOutstandingBills("connect.sid=$cookie")) {
                 is ApiResult.Success -> {
                     Log.d(TAG, "Bills check successful: ${result.data.size} bills found")
-                    _isLoading.value = false
+                    _isLoadingBills.value = false
                     if (result.data.isEmpty()) {
                         _billsStatus.value = "You don't have any pending bills left"
                     } else {
@@ -68,10 +103,117 @@ class HomeViewModel(application: Application) : AndroidViewModel(application) {
                 }
                 is ApiResult.Error -> {
                     Log.d(TAG, "Bills check failed: ${result.message}")
-                    _isLoading.value = false
+                    _isLoadingBills.value = false
                     _billsStatus.value = "Unable to check bills status"
                 }
             }
         }
     }
-}
+    
+    private fun loadCustomerSubscriptions() {
+        val cookie = secureStorage.getCookie()
+        if (cookie == null) {
+            Log.d(TAG, "No cookie found, cannot load subscriptions")
+            _subscriptionsError.value = "Authentication required"
+            return
+        }
+        
+        _isLoadingSubscriptions.value = true
+        _subscriptionsError.value = null
+        
+        viewModelScope.launch {
+            Log.d(TAG, "Loading customer subscriptions")
+            when (val result = apiService.getCustomerSubscriptions("connect.sid=$cookie")) {
+                is ApiResult.Success -> {
+                    Log.d(TAG, "Subscriptions loaded successfully: ${result.data.size} found")
+                    _isLoadingSubscriptions.value = false
+                    _subscriptions.value = result.data
+                    
+                } is ApiResult.Error -> {
+                    Log.d(TAG, "Failed to load subscriptions: ${result.message}")
+                    _isLoadingSubscriptions.value = false
+                    _subscriptionsError.value = result.message
+                }
+            }
+        }
+    }
+    
+    fun loadUsageChart(subscriptionId: Long) {
+        val cookie = secureStorage.getCookie()
+        if (cookie == null) {
+            Log.d(TAG, "No cookie found, cannot load usage data")
+            _chartError.value = "Authentication required"
+            return
+        }
+        
+        // Find the subscription to get service type
+        val subscription = _subscriptions.value?.find { it.id == subscriptionId }
+        if (subscription == null) {
+            Log.d(TAG, "Subscription not found: $subscriptionId")
+            _chartError.value = "Subscription not found"
+            return
+        }
+        
+        val serviceType = when (subscription.subscription.serviceId) {
+            1 -> "Electrical"
+            2 -> "Water"
+            else -> "Unknown"
+        }
+        
+        val unit = when (subscription.subscription.serviceId) {
+            1 -> "kWh"
+            2 -> "Ltr"
+            else -> "Units"
+        }
+        
+        _isLoadingChart.value = true
+        _chartError.value = null
+        _chartServiceType.value = serviceType
+        _chartUnit.value = unit
+        
+        viewModelScope.launch {
+            Log.d(TAG, "Loading usage data for subscription: $subscriptionId")
+            when (val result = apiService.getSubscriptionUsage(subscriptionId, "connect.sid=$cookie")) {
+                is ApiResult.Success -> {
+                    Log.d(TAG, "Usage data loaded successfully: ${result.data.size} readings")
+                    _isLoadingChart.value = false
+                    
+                    // Convert usage readings to chart data points
+                    val chartPoints = result.data.mapNotNull { reading ->
+                        try {
+                            val date = dateFormatter.parse(reading.meter.currentReadingDate.substring(0, 10))
+                            val value = reading.meter.currentUnits.toFloat()
+                            val calendar = Calendar.getInstance().apply { time = date }
+                            val monthYear = "${calendar.getDisplayName(Calendar.MONTH, Calendar.SHORT, Locale.getDefault())} ${calendar.get(Calendar.YEAR)}"
+                            
+                            date?.let {
+                                ChartDataPoint(
+                                    date = it,
+                                    value = value,
+                                    label = monthYear
+                                )
+                            }
+                        } catch (e: Exception) {
+                            Log.e(TAG, "Error parsing usage reading", e)
+                            null
+                        }
+                    }.sortedBy { it.date } // Sort by date ascending
+                    
+                    _chartData.value = chartPoints
+                    
+                } is ApiResult.Error -> {
+                    Log.d(TAG, "Failed to load usage data: ${result.message}")
+                    _isLoadingChart.value = false
+                    _chartError.value = result.message
+                }
+            }
+        }
+    }
+    
+    fun refreshData() {
+        Log.d(TAG, "Refreshing all data")
+        loadUserData()
+        checkOutstandingBills()
+        loadCustomerSubscriptions()
+    }
+}

app/src/main/java/sh/sar/gridflow/ui/home/SubscriptionDropdownItem.kt

@@ -0,0 +1,10 @@
+package sh.sar.gridflow.ui.home
+
+data class SubscriptionDropdownItem(
+    val id: Long,
+    val displayName: String,
+    val serviceType: String,
+    val serviceId: Int
+) {
+    override fun toString(): String = displayName
+}

app/src/main/java/sh/sar/gridflow/ui/home/SubscriptionsAdapter.kt

@@ -0,0 +1,124 @@
+package sh.sar.gridflow.ui.home
+
+import android.graphics.Color
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import sh.sar.gridflow.data.CustomerSubscription
+import sh.sar.gridflow.databinding.ItemSubscriptionBinding
+import java.text.NumberFormat
+import java.util.*
+
+class SubscriptionsAdapter(
+    private var subscriptions: List<CustomerSubscription> = emptyList(),
+    private var selectedSubscriptionId: Long? = null,
+    private val onSubscriptionClick: (CustomerSubscription) -> Unit = {}
+) : RecyclerView.Adapter<SubscriptionsAdapter.SubscriptionViewHolder>() {
+
+    fun updateSubscriptions(newSubscriptions: List<CustomerSubscription>) {
+        subscriptions = newSubscriptions
+        notifyDataSetChanged()
+    }
+    
+    fun setSelectedSubscription(subscriptionId: Long?) {
+        val oldSelectedIndex = subscriptions.indexOfFirst { it.id == selectedSubscriptionId }
+        val newSelectedIndex = subscriptions.indexOfFirst { it.id == subscriptionId }
+        
+        selectedSubscriptionId = subscriptionId
+        
+        // Update old selection
+        if (oldSelectedIndex != -1) {
+            notifyItemChanged(oldSelectedIndex)
+        }
+        
+        // Update new selection
+        if (newSelectedIndex != -1) {
+            notifyItemChanged(newSelectedIndex)
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SubscriptionViewHolder {
+        val binding = ItemSubscriptionBinding.inflate(
+            LayoutInflater.from(parent.context),
+            parent,
+            false
+        )
+        return SubscriptionViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(holder: SubscriptionViewHolder, position: Int) {
+        holder.bind(subscriptions[position])
+    }
+
+    override fun getItemCount(): Int = subscriptions.size
+
+    inner class SubscriptionViewHolder(
+        private val binding: ItemSubscriptionBinding
+    ) : RecyclerView.ViewHolder(binding.root) {
+
+        fun bind(subscription: CustomerSubscription) {
+            with(binding) {
+                // Check if this item is selected
+                val isSelected = subscription.id == selectedSubscriptionId
+                
+                // Show/hide selection indicator
+                viewSelectionIndicator.visibility = if (isSelected) View.VISIBLE else View.GONE
+                
+                // Set subscription name
+                textSubscriptionName.text = subscription.name
+
+                // Set subscription number
+                textSubscriptionNumber.text = "Sub: ${subscription.subscription.subscriptionNumber}"
+
+                // Set service type and icon
+                val serviceType = when (subscription.subscription.serviceId) {
+                    1 -> "Electrical"
+                    2 -> "Water"
+                    else -> "Unknown"
+                }
+                textServiceType.text = serviceType
+
+                // Set service icon
+                val (icon, iconColor) = when (subscription.subscription.serviceId) {
+                    1 -> "⚡" to Color.parseColor("#FF9800") // Orange for electrical
+                    2 -> "💧" to Color.parseColor("#2196F3") // Blue for water
+                    else -> "🔌" to Color.parseColor("#4CAF50") // Green for unknown
+                }
+                textServiceIcon.text = icon
+
+                // Set last bill info
+                val lastBill = subscription.subscription.lastBill
+                if (lastBill != null) {
+                    val amount = try {
+                        lastBill.billAmount.toDouble()
+                    } catch (e: NumberFormatException) {
+                        0.0
+                    }
+                    
+                    val formatter = NumberFormat.getCurrencyInstance(Locale("en", "MV"))
+                    formatter.currency = Currency.getInstance("MVR")
+                    textBillAmount.text = formatter.format(amount)
+
+                    // Set bill status with appropriate color
+                    val (statusText, statusColor) = when (lastBill.status.lowercase()) {
+                        "paid" -> "Paid" to Color.parseColor("#4CAF50")
+                        "pending" -> "Pending" to Color.parseColor("#FF9800")
+                        "overdue" -> "Overdue" to Color.parseColor("#F44336")
+                        else -> lastBill.status to Color.parseColor("#666666")
+                    }
+                    textBillStatus.text = statusText
+                    textBillStatus.setTextColor(statusColor)
+                } else {
+                    textBillAmount.text = "No bill"
+                    textBillStatus.text = ""
+                }
+
+                // Set click listener
+                root.setOnClickListener {
+                    onSubscriptionClick(subscription)
+                }
+            }
+        }
+    }
+}

app/src/main/java/sh/sar/gridflow/ui/widgets/BarChartView.kt

@@ -0,0 +1,195 @@
+package sh.sar.gridflow.ui.widgets
+
+import android.content.Context
+import android.graphics.*
+import android.util.AttributeSet
+import android.view.View
+import java.text.SimpleDateFormat
+import java.util.*
+import kotlin.math.max
+import kotlin.math.roundToInt
+
+data class ChartDataPoint(
+    val date: Date,
+    val value: Float,
+    val label: String
+)
+
+class BarChartView @JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = 0
+) : View(context, attrs, defStyleAttr) {
+
+    private val barPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+        color = Color.parseColor("#2196F3")
+        style = Paint.Style.FILL
+    }
+    
+    private val textPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+        color = Color.parseColor("#666666")
+        textSize = 28f
+        textAlign = Paint.Align.CENTER
+    }
+    
+    private val axisTextPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+        color = Color.parseColor("#999999")
+        textSize = 24f
+        textAlign = Paint.Align.CENTER
+    }
+    
+    private val axisPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+        color = Color.parseColor("#EEEEEE")
+        strokeWidth = 2f
+    }
+    
+    private var dataPoints: List<ChartDataPoint> = emptyList()
+    private var unit: String = ""
+    private var serviceType: String = ""
+    
+    private val padding = 60f  // Increased left padding for y-axis labels
+    private val bottomPadding = 120f
+    private val topPadding = 80f
+    
+    private val monthFormatter = SimpleDateFormat("MMM", Locale.getDefault())
+    
+    fun setData(data: List<ChartDataPoint>, unit: String, serviceType: String) {
+        this.dataPoints = data.takeLast(10).reversed() // Show last 10 months, most recent first
+        this.unit = unit
+        this.serviceType = serviceType
+        
+        // Update colors based on service type
+        when (serviceType.lowercase()) {
+            "electrical" -> {
+                barPaint.color = Color.parseColor("#FF9800") // Orange for electrical
+            }
+            "water" -> {
+                barPaint.color = Color.parseColor("#2196F3") // Blue for water
+            }
+            else -> {
+                barPaint.color = Color.parseColor("#4CAF50") // Green default
+            }
+        }
+        
+        invalidate()
+    }
+    
+    override fun onDraw(canvas: Canvas) {
+        super.onDraw(canvas)
+        
+        if (dataPoints.isEmpty()) {
+            drawEmptyState(canvas)
+            return
+        }
+        
+        val chartWidth = width - (padding * 2)
+        val chartHeight = height - bottomPadding - topPadding
+        
+        // Find max value for scaling
+        val maxValue = dataPoints.maxOfOrNull { it.value } ?: 1f
+        val niceMaxValue = getNiceMaxValue(maxValue)
+        
+        // Draw y-axis labels and grid lines
+        drawYAxisAndGrid(canvas, niceMaxValue, chartHeight)
+        
+        // Calculate bar dimensions
+        val barWidth = chartWidth / dataPoints.size * 0.8f
+        val barSpacing = chartWidth / dataPoints.size * 0.2f
+        
+        // Draw bars and x-axis labels
+        dataPoints.forEachIndexed { index, dataPoint ->
+            val barHeight = (dataPoint.value / niceMaxValue) * chartHeight
+            val x = padding + (index * (barWidth + barSpacing)) + barSpacing / 2
+            val y = topPadding + chartHeight - barHeight
+            
+            // Draw bar
+            val rect = RectF(x, y, x + barWidth, topPadding + chartHeight)
+            canvas.drawRoundRect(rect, 8f, 8f, barPaint)
+            
+            // Draw value on top of bar
+            if (barHeight > 40f) { // Only show if bar is tall enough
+                val valueText = formatValue(dataPoint.value)
+                canvas.drawText(
+                    valueText,
+                    x + barWidth / 2,
+                    y - 8f,
+                    textPaint
+                )
+            }
+            
+            // Draw month label
+            val monthText = monthFormatter.format(dataPoint.date)
+            canvas.drawText(
+                monthText,
+                x + barWidth / 2,
+                height - 60f,
+                axisTextPaint
+            )
+            
+            // Draw year if it's January or first/last item
+            val calendar = Calendar.getInstance().apply { time = dataPoint.date }
+            if (calendar.get(Calendar.MONTH) == Calendar.JANUARY || index == 0 || index == dataPoints.size - 1) {
+                val yearText = calendar.get(Calendar.YEAR).toString()
+                canvas.drawText(
+                    yearText,
+                    x + barWidth / 2,
+                    height - 32f,
+                    axisTextPaint
+                )
+            }
+        }
+    }
+    
+    private fun drawEmptyState(canvas: Canvas) {
+        val text = "No usage data available"
+        val x = width / 2f
+        val y = height / 2f
+        
+        textPaint.textAlign = Paint.Align.CENTER
+        textPaint.color = Color.parseColor("#CCCCCC")
+        canvas.drawText(text, x, y, textPaint)
+    }
+    
+    private fun drawYAxisAndGrid(canvas: Canvas, maxValue: Float, chartHeight: Float) {
+        val steps = 5
+        val stepValue = maxValue / steps
+        
+        for (i in 0..steps) {
+            val value = i * stepValue
+            val y = topPadding + chartHeight - (value / maxValue * chartHeight)
+            
+            // Draw grid line
+            canvas.drawLine(padding, y, width - padding, y, axisPaint)
+            
+            // Draw y-axis label
+            val labelText = formatValue(value)
+            axisTextPaint.textAlign = Paint.Align.RIGHT
+            canvas.drawText(labelText, padding - 8f, y + 8f, axisTextPaint)
+        }
+    }
+    
+    private fun getNiceMaxValue(maxValue: Float): Float {
+        if (maxValue <= 0) return 100f
+        
+        val magnitude = Math.pow(10.0, Math.floor(Math.log10(maxValue.toDouble()))).toFloat()
+        val normalized = maxValue / magnitude
+        
+        val niceNormalized = when {
+            normalized <= 1f -> 1f
+            normalized <= 2f -> 2f
+            normalized <= 5f -> 5f
+            else -> 10f
+        }
+        
+        return niceNormalized * magnitude
+    }
+    
+    private fun formatValue(value: Float): String {
+        return when {
+            value >= 1000f -> "${(value / 1000f).roundToInt()}k"
+            value >= 100f -> value.roundToInt().toString()
+            value >= 10f -> "%.1f".format(value)
+            else -> "%.2f".format(value)
+        }
+    }
+}

app/src/main/res/drawable/circle_background.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <solid android:color="@color/icon_circle_background" />
+    <stroke android:width="1dp" android:color="@color/icon_circle_border" />
+</shape>

app/src/main/res/drawable/selected_subscription_background.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@color/selected_subscription_background" />
+    <stroke android:width="1dp" android:color="@color/selected_subscription_border" />
+    <corners android:radius="16dp" />
+</shape>

app/src/main/res/layout/fragment_home.xml

@@ -12,7 +12,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical"
-        android:padding="20dp">
+        android:padding="16dp">
 
         <!-- Welcome Section -->
         <TextView
@@ -64,16 +64,237 @@
 
         </com.google.android.material.card.MaterialCardView>
 
-        <!-- Placeholder for future features -->
-        <TextView
+        <!-- Subscriptions Overview Card -->
+        <com.google.android.material.card.MaterialCardView
+            android:id="@+id/card_subscriptions"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:text="More features coming soon..."
-            android:textSize="14sp"
-            android:textColor="?android:attr/textColorSecondary"
-            android:gravity="center"
-            android:layout_marginTop="32dp" />
+            android:layout_marginBottom="24dp"
+            app:cardCornerRadius="12dp"
+            app:cardElevation="2dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:padding="16dp">
+
+                <TextView
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:text="Your Subscriptions"
+                    android:textSize="18sp"
+                    android:textStyle="bold"
+                    android:textColor="?android:attr/textColorPrimary"
+                    android:layout_marginBottom="12dp" />
+
+                <androidx.recyclerview.widget.RecyclerView
+                    android:id="@+id/recycler_subscriptions"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginBottom="16dp"
+                    tools:listitem="@layout/item_subscription" />
+
+                <ProgressBar
+                    android:id="@+id/progress_subscriptions"
+                    android:layout_width="32dp"
+                    android:layout_height="32dp"
+                    android:layout_gravity="center"
+                    android:visibility="gone" />
+
+                <TextView
+                    android:id="@+id/text_subscriptions_error"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:text="Unable to load subscriptions"
+                    android:textColor="?android:attr/textColorSecondary"
+                    android:gravity="center"
+                    android:visibility="gone" />
+
+            </LinearLayout>
+
+        </com.google.android.material.card.MaterialCardView>
+
+        <!-- Usage Chart Card -->
+        <com.google.android.material.card.MaterialCardView
+            android:id="@+id/card_usage_chart"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="24dp"
+            app:cardCornerRadius="12dp"
+            app:cardElevation="2dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:padding="16dp">
+
+                <!-- Chart Header -->
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="horizontal"
+                    android:gravity="center_vertical"
+                    android:layout_marginBottom="16dp">
+
+                    <TextView
+                        android:id="@+id/text_chart_title"
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="1"
+                        android:text="Usage Chart"
+                        android:textSize="18sp"
+                        android:textStyle="bold"
+                        android:textColor="?android:attr/textColorPrimary" />
+
+                    <!-- Selected Subscription Info -->
+                    <LinearLayout
+                        android:id="@+id/layout_selected_subscription"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:orientation="horizontal"
+                        android:gravity="center_vertical"
+                        android:visibility="gone"
+                        android:padding="8dp"
+                        android:background="@drawable/selected_subscription_background">
+
+                        <TextView
+                            android:id="@+id/text_selected_icon"
+                            android:layout_width="24dp"
+                            android:layout_height="24dp"
+                            android:layout_marginEnd="8dp"
+                            android:gravity="center"
+                            android:textSize="14sp"
+                            android:text="⚡" />
+
+                        <TextView
+                            android:id="@+id/text_selected_name"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:textSize="14sp"
+                            android:textColor="?android:attr/textColorPrimary"
+                            android:textStyle="bold"
+                            android:maxLines="1"
+                            android:ellipsize="end"
+                            android:maxWidth="120dp"
+                            android:text="Home" />
+
+                    </LinearLayout>
+
+                </LinearLayout>
+
+                <!-- Chart Container -->
+                <FrameLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="300dp">
+
+                    <!-- Chart View -->
+                    <sh.sar.gridflow.ui.widgets.BarChartView
+                        android:id="@+id/chart_usage"
+                        android:layout_width="match_parent"
+                        android:layout_height="match_parent"
+                        android:visibility="gone" />
+
+                    <!-- Loading State -->
+                    <LinearLayout
+                        android:id="@+id/layout_chart_loading"
+                        android:layout_width="match_parent"
+                        android:layout_height="match_parent"
+                        android:orientation="vertical"
+                        android:gravity="center"
+                        android:visibility="gone">
+
+                        <ProgressBar
+                            android:layout_width="32dp"
+                            android:layout_height="32dp"
+                            android:layout_marginBottom="8dp" />
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Loading usage data..."
+                            android:textColor="?android:attr/textColorSecondary" />
+
+                    </LinearLayout>
+
+                    <!-- Empty State -->
+                    <LinearLayout
+                        android:id="@+id/layout_chart_empty"
+                        android:layout_width="match_parent"
+                        android:layout_height="match_parent"
+                        android:orientation="vertical"
+                        android:gravity="center">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="📊"
+                            android:textSize="48sp"
+                            android:layout_marginBottom="8dp" />
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Select a subscription to view usage chart"
+                            android:textColor="?android:attr/textColorSecondary"
+                            android:textAlignment="center" />
+
+                    </LinearLayout>
+
+                    <!-- Error State -->
+                    <LinearLayout
+                        android:id="@+id/layout_chart_error"
+                        android:layout_width="match_parent"
+                        android:layout_height="match_parent"
+                        android:orientation="vertical"
+                        android:gravity="center"
+                        android:visibility="gone">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="⚠️"
+                            android:textSize="48sp"
+                            android:layout_marginBottom="8dp" />
+
+                        <TextView
+                            android:id="@+id/text_chart_error"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Unable to load usage data"
+                            android:textColor="?android:attr/textColorSecondary"
+                            android:textAlignment="center" />
+
+                    </LinearLayout>
+
+                </FrameLayout>
+
+                <!-- Chart Legend -->
+                <LinearLayout
+                    android:id="@+id/layout_chart_legend"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="horizontal"
+                    android:gravity="center"
+                    android:layout_marginTop="12dp"
+                    android:visibility="gone">
+
+                    <TextView
+                        android:id="@+id/text_chart_unit"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="kWh"
+                        android:textSize="12sp"
+                        android:textColor="?android:attr/textColorSecondary"
+                        android:textStyle="bold" />
+
+                </LinearLayout>
+
+            </LinearLayout>
+
+        </com.google.android.material.card.MaterialCardView>
 
     </LinearLayout>
 
-</ScrollView>
+</ScrollView>

app/src/main/res/layout/item_subscription.xml

@@ -0,0 +1,110 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="horizontal"
+    android:padding="12dp"
+    android:gravity="center_vertical"
+    android:background="?android:attr/selectableItemBackground"
+    android:id="@+id/layout_subscription_item">
+
+    <!-- Service Icon -->
+    <TextView
+        android:id="@+id/text_service_icon"
+        android:layout_width="32dp"
+        android:layout_height="32dp"
+        android:layout_marginEnd="12dp"
+        android:background="@drawable/circle_background"
+        android:gravity="center"
+        android:textSize="16sp"
+        tools:text="⚡" />
+
+    <!-- Subscription Details -->
+    <LinearLayout
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:orientation="vertical">
+
+        <TextView
+            android:id="@+id/text_subscription_name"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:textSize="16sp"
+            android:textStyle="bold"
+            android:textColor="?android:attr/textColorPrimary"
+            android:maxLines="1"
+            android:ellipsize="end"
+            tools:text="Thithilee, Hirundhu Magu, Kulhudhuffushi Electricity" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            android:layout_marginTop="2dp">
+
+            <TextView
+                android:id="@+id/text_subscription_number"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:textSize="12sp"
+                android:textColor="?android:attr/textColorSecondary"
+                tools:text="Sub: 8584" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text=" • "
+                android:textSize="12sp"
+                android:textColor="?android:attr/textColorSecondary" />
+
+            <TextView
+                android:id="@+id/text_service_type"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:textSize="12sp"
+                android:textColor="?android:attr/textColorSecondary"
+                tools:text="Electrical" />
+
+        </LinearLayout>
+
+    </LinearLayout>
+
+    <!-- Last Bill Amount -->
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:gravity="end">
+
+        <TextView
+            android:id="@+id/text_bill_amount"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textSize="16sp"
+            android:textStyle="bold"
+            android:textColor="?android:attr/textColorPrimary"
+            tools:text="MVR 320.83" />
+
+        <TextView
+            android:id="@+id/text_bill_status"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textSize="12sp"
+            android:layout_marginTop="2dp"
+            tools:text="Paid"
+            tools:textColor="#4CAF50" />
+
+    </LinearLayout>
+
+    <!-- Selection Indicator -->
+    <View
+        android:id="@+id/view_selection_indicator"
+        android:layout_width="4dp"
+        android:layout_height="40dp"
+        android:layout_marginStart="8dp"
+        android:background="#2196F3"
+        android:visibility="gone" />
+
+</LinearLayout>

app/src/main/res/values-night/colors.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Material Design default colors for dark theme -->
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+    
+    <!-- Dark theme colors -->
+    <color name="icon_circle_background">#2C2C2C</color>
+    <color name="icon_circle_border">#555555</color>
+    <color name="selected_subscription_background">#1E3A8A</color>
+    <color name="selected_subscription_border">#3B82F6</color>
+</resources>

app/src/main/res/values/colors.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <!-- Material Design default colors -->
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
     <color name="purple_700">#FF3700B3</color>
@@ -7,4 +8,10 @@
     <color name="teal_700">#FF018786</color>
     <color name="black">#FF000000</color>
     <color name="white">#FFFFFFFF</color>
-</resources>
+    
+    <!-- Light theme colors -->
+    <color name="icon_circle_background">#E3F2FD</color>
+    <color name="icon_circle_border">#BBDEFB</color>
+    <color name="selected_subscription_background">#E3F2FD</color>
+    <color name="selected_subscription_border">#90CAF9</color>
+</resources>