fix paymv qr generation part 1

app/src/main/java/sh/sar/basedbank/ui/home/PayMvQrFragment.kt

@@ -36,6 +36,7 @@ import sh.sar.basedbank.BasedBankApp
 import sh.sar.basedbank.R
 import sh.sar.basedbank.api.models.BankAccount
 import sh.sar.basedbank.databinding.FragmentPayMvQrBinding
+import sh.sar.basedbank.util.CredentialStore
 import sh.sar.basedbank.databinding.ItemAccountDropdownBinding
 import sh.sar.basedbank.util.AccountListParser
 import sh.sar.basedbank.util.PaymvQrParser
@@ -98,6 +99,8 @@ class PayMvQrFragment : Fragment() {
         }
         setupDropdown()
         binding.etAmount.addTextChangedListener { scheduleGenerate() }
+        binding.etReference.addTextChangedListener { scheduleGenerate() }
+        binding.switchIncludePhone.setOnCheckedChangeListener { _, _ -> scheduleGenerate() }
         binding.btnShare.isEnabled = false
         binding.btnSave.isEnabled = false
         binding.btnShare.setOnClickListener { shareQr() }
@@ -147,8 +150,28 @@ class PayMvQrFragment : Fragment() {
             ?.let { "%.2f".format(it) }
 
         val ctx = requireContext()
+        val includePhone = binding.switchIncludePhone.isChecked
+        val loginId = sh.sar.basedbank.util.ProfileImageStore.loginIdFromTag(account.loginTag)
+        val store = CredentialStore(ctx)
+        val mobile = if (includePhone) {
+            when (account.bank) {
+                "BML"     -> store.loadBmlUserProfile(loginId)?.mobile
+                "FAHIPAY" -> store.loadFahipayUserProfile(loginId)?.mobile
+                else      -> null
+            }?.let { m ->
+                when {
+                    m.startsWith("+") -> m
+                    m.length == 7     -> "+960$m"
+                    else              -> m
+                }
+            }
+        } else null
+
+        val purpose = binding.etReference.text?.toString()?.trim()
+            ?.takeIf { it.isNotBlank() } ?: getString(R.string.paymvqr_reference_default)
+
         val bmp = withContext(Dispatchers.Default) {
-            val payload = buildQrPayload(account.accountNumber, account.accountBriefName, acquirer, amountFormatted)
+            val payload = buildQrPayload(account.accountNumber, account.accountBriefName, acquirer, amountFormatted, mobile, purpose)
             renderQrCard(ctx, account, payload, amountFormatted)
         }
         if (_binding == null) return
@@ -166,7 +189,9 @@ class PayMvQrFragment : Fragment() {
         accountNumber: String,
         accountName: String,
         acquirer: String,
-        amountStr: String?
+        amountStr: String?,
+        mobile: String?,
+        purpose: String
     ): String {
         fun tlv(tag: String, value: String): String {
             val len = value.length
@@ -176,17 +201,30 @@ class PayMvQrFragment : Fragment() {
         val poi          = tlv("01", "11")
         val sub00        = tlv("00", "mv.favara.mpqr")
         val sub01        = tlv("01", acquirer)
+        val sub02        = tlv("02", acquirer) // repeated acquirer, as per official PayMV app
         val sub03        = tlv("03", accountNumber)
+        val sub05        = if (!mobile.isNullOrBlank()) tlv("05", mobile) else ""
         val sub10        = tlv("10", "IPAY")
-        val merchantAcct = tlv("26", sub00 + sub01 + sub03 + sub10)
+        val merchantAcct = tlv("26", sub00 + sub01 + sub02 + sub03 + sub05 + sub10)
+        val mcc          = tlv("52", "0000")
         val currency     = tlv("53", "462")
         val amountTLV    = if (!amountStr.isNullOrBlank()) tlv("54", amountStr) else ""
         val country      = tlv("58", "MV")
         val name         = tlv("59", accountName.take(25))
-        val prefix       = format + poi + merchantAcct + currency + amountTLV + country + name + "6304"
+        val ref          = generateReference()
+        val addlData     = tlv("62", tlv("05", ref) + tlv("08", purpose))
+        val timestamp    = java.time.LocalDateTime.now()
+            .format(java.time.format.DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.00000"))
+        val tag80        = tlv("80", tlv("00", "mv.favara.mpqr") + tlv("01", timestamp))
+        val prefix       = format + poi + merchantAcct + mcc + currency + amountTLV + country + name + addlData + tag80 + "6304"
         return prefix + crc16(prefix)
     }
 
+    private fun generateReference(): String {
+        val chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+        return (1..9).map { chars.random() }.joinToString("")
+    }
+
     private fun crc16(data: String): String {
         var crc = 0xFFFF
         for (c in data) {