package sh.sar.gridflow

import android.content.Intent
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.app.AppCompatDelegate
import androidx.lifecycle.lifecycleScope
import kotlinx.coroutines.launch
import sh.sar.gridflow.databinding.ActivityAddAccountBinding
import sh.sar.gridflow.network.ApiResult
import sh.sar.gridflow.network.FenakaApiService
import sh.sar.gridflow.utils.Account
import sh.sar.gridflow.utils.SecureStorage

class AddAccountActivity : AppCompatActivity() {
    
    private lateinit var binding: ActivityAddAccountBinding
    private lateinit var secureStorage: SecureStorage
    private lateinit var apiService: FenakaApiService
    
    companion object {
        private const val TAG = "AddAccountActivity"
    }
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        
        // Force system theme (follows device dark mode setting)
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
        
        Log.d(TAG, "AddAccountActivity onCreate")
        
        binding = ActivityAddAccountBinding.inflate(layoutInflater)
        setContentView(binding.root)
        
        // Set up the toolbar
        setSupportActionBar(binding.toolbar)
        supportActionBar?.setDisplayHomeAsUpEnabled(true)
        supportActionBar?.title = "Add Account"
        
        try {
            secureStorage = SecureStorage(this)
            apiService = FenakaApiService()
        } catch (e: Exception) {
            Log.e(TAG, "Failed to initialize SecureStorage, continuing without it", e)
            apiService = FenakaApiService()
            Toast.makeText(this, "Warning: Secure storage not available", Toast.LENGTH_SHORT).show()
        }
        
        setupClickListeners()
    }
    
    override fun onSupportNavigateUp(): Boolean {
        onBackPressed()
        return true
    }
    
    private fun setupClickListeners() {
        binding.btnSignIn.setOnClickListener {
            handleSignIn()
        }
        
        binding.btnRegister.setOnClickListener {
            handleRegister()
        }
        
        binding.btnForgotPassword.setOnClickListener {
            handleForgotPassword()
        }
    }
    
    private fun showLoginError(message: String) {
        val dialog = androidx.appcompat.app.AlertDialog.Builder(this)
            .setTitle("Login Failed")
            .setMessage(message)
            .setPositiveButton("Retry") { _, _ ->
                // Retry the login with the same credentials
                handleSignIn()
            }
            .setNegativeButton("Cancel") { dialog, _ ->
                dialog.dismiss()
            }
            .setCancelable(true)
            .create()
            
        dialog.show()
    }
    
    private fun handleSignIn() {
        val mobileNumber = binding.etMobileNumber.text.toString().trim()
        val password = binding.etPassword.text.toString().trim()
        
        Log.d(TAG, "handleSignIn called with mobile: $mobileNumber")
        
        if (validateInput(mobileNumber, password)) {
            Log.d(TAG, "Input validation passed, calling performLogin")
            performLogin(mobileNumber, password)
        } else {
            Log.d(TAG, "Input validation failed")
        }
    }
    
    private fun performLogin(mobile: String, password: String) {
        Log.d(TAG, "performLogin called with mobile: $mobile")
        
        // Check if account already exists
        val existingAccounts = secureStorage.getAllAccounts()
        if (existingAccounts.any { it.mobile == mobile }) {
            Toast.makeText(this, "Account already exists", Toast.LENGTH_SHORT).show()
            return
        }
        
        setLoading(true)
        
        lifecycleScope.launch {
            Log.d(TAG, "Starting coroutine for API call")
            try {
                when (val result = apiService.login(mobile, password)) {
                    is ApiResult.Success -> {
                        Log.d(TAG, "Login successful: ${result.data}")
                        
                        // Create new account object
                        val newAccount = Account(
                            id = mobile,
                            name = result.data.name ?: "",
                            mobile = mobile,
                            email = result.data.email,
                            password = password,
                            cookie = extractSessionId(result.cookie ?: ""),
                            userId = result.data.id,
                            isActive = false // Will be set as active when switched to
                        )
                        
                        // Save the new account
                        secureStorage.saveAccount(newAccount)
                        
                        setLoading(false)
                        
                        // Show success message and finish
                        Toast.makeText(this@AddAccountActivity, "Account added successfully", Toast.LENGTH_SHORT).show()
                        
                        // Return to main activity
                        val intent = Intent(this@AddAccountActivity, MainActivity::class.java)
                        intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP
                        startActivity(intent)
                        finish()
                    }
                    is ApiResult.Error -> {
                        Log.d(TAG, "Login failed: ${result.message} (code: ${result.code})")
                        setLoading(false)
                        showLoginError(result.message)
                    }
                }
            } catch (e: Exception) {
                Log.e(TAG, "Exception in performLogin coroutine", e)
                setLoading(false)
                showLoginError("Login failed: ${e.message}")
            }
        }
    }
    
    private fun extractSessionId(setCookieHeader: String): String {
        // Extract the session ID from Set-Cookie header
        return setCookieHeader.substringBefore(";").substringAfter("connect.sid=")
    }
    
    private fun setLoading(isLoading: Boolean) {
        binding.btnSignIn.isEnabled = !isLoading
        binding.btnSignIn.text = if (isLoading) "Signing in..." else "Sign In"
        
        // Disable other buttons during loading
        binding.btnRegister.isEnabled = !isLoading
        binding.btnForgotPassword.isEnabled = !isLoading
        
        // Show/hide progress indicator
        binding.etMobileNumber.isEnabled = !isLoading
        binding.etPassword.isEnabled = !isLoading
    }
    
    private fun handleRegister() {
        Log.d(TAG, "Register button clicked")
        val intent = Intent(this, RegisterActivity::class.java)
        startActivity(intent)
    }
    
    private fun handleForgotPassword() {
        Log.d(TAG, "Forgot password button clicked")
        val intent = Intent(this, ForgotPasswordActivity::class.java)
        startActivity(intent)
    }
    
    private fun validateInput(mobileNumber: String, password: String): Boolean {
        if (mobileNumber.isEmpty()) {
            binding.etMobileNumber.error = "Mobile number is required"
            return false
        }
        
        if (password.isEmpty()) {
            binding.etPassword.error = "Password is required"
            return false
        }
        
        // Client-side password validation - must be at least 8 characters
        if (password.length < 8) {
            binding.etPassword.error = "Password must be at least 8 characters"
            return false
        }
        
        // Basic Maldives mobile number validation (7xxxxxx format)
        if (!mobileNumber.matches(Regex("^[79]\\d{6}$"))) {
            binding.etMobileNumber.error = "Enter a valid Maldives mobile number"
            return false
        }
        
        return true
    }
}