Updated on 2026-08-14

data/feedback/src/main/java/com/tangem/data/feedback/DefaultFeedbackRepository.kt

@@ -3,6 +3,7 @@ package com.tangem.data.feedback
 import android.content.Context
 import android.content.pm.PackageInfo
 import android.os.Build
+import com.tangem.blockchain.common.Blockchain
 import com.tangem.data.feedback.converters.BlockchainInfoConverter
 import com.tangem.data.feedback.converters.CardInfoConverter
 import com.tangem.datasource.local.preferences.AppPreferencesStore
@@ -13,6 +14,9 @@ import com.tangem.datasource.local.walletmanager.WalletManagersStore
 import com.tangem.domain.feedback.models.*
 import com.tangem.domain.feedback.repository.FeedbackRepository
 import com.tangem.domain.wallets.models.UserWallet
+import com.tangem.domain.wallets.models.UserWalletId
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.update
 import timber.log.Timber
 import java.io.File
 import java.io.FileWriter
@@ -35,6 +39,8 @@ internal class DefaultFeedbackRepository(
     private val context: Context,
 ) : FeedbackRepository {
 
+    private val blockchainsErrors = MutableStateFlow<Map<UserWalletId, BlockchainErrorInfo>>(emptyMap())
+
     override suspend fun getUserWalletsInfo(): UserWalletsInfo {
         return UserWalletsInfo(
             selectedUserWalletId = getSelectedUserWallet().walletId.stringValue,
@@ -52,6 +58,16 @@ internal class DefaultFeedbackRepository(
             .map(BlockchainInfoConverter::convert)
     }
 
+    override suspend fun getBlockchainInfo(blockchainId: String, derivationPath: String?): BlockchainInfo? {
+        return walletManagersStore
+            .getSyncOrNull(
+                userWalletId = getSelectedUserWallet().walletId,
+                blockchain = Blockchain.fromId(blockchainId),
+                derivationPath = derivationPath,
+            )
+            ?.let(BlockchainInfoConverter::convert)
+    }
+
     override fun getPhoneInfo(): PhoneInfo {
         return PhoneInfo(
             phoneModel = Build.MODEL,
@@ -60,6 +76,22 @@ internal class DefaultFeedbackRepository(
         )
     }
 
+    override fun saveBlockchainErrorInfo(error: BlockchainErrorInfo) {
+        blockchainsErrors.update {
+            it.toMutableMap().apply {
+                put(getSelectedUserWallet().walletId, error)
+            }
+        }
+    }
+
+    override suspend fun getBlockchainErrorInfo(): BlockchainErrorInfo? {
+        return blockchainsErrors.value[getSelectedUserWallet().walletId].also {
+            if (it == null) {
+                Timber.e("Blockchain error info is null for ${getSelectedUserWallet().walletId}")
+            }
+        }
+    }
+
     override suspend fun getAppLogs(): List<AppLogModel> {
         return appPreferencesStore.getObjectMap<String>(key = PreferencesKeys.APP_LOGS_KEY)
             .map { AppLogModel(timestamp = it.key.toLong(), message = it.value) }

domain/feedback/build.gradle.kts

@@ -13,4 +13,5 @@ dependencies {
     implementation(deps.jodatime)
 
     implementation(projects.core.res)
+    implementation(projects.domain.wallets.models)
 }

domain/feedback/src/main/java/com/tangem/domain/feedback/FeedbackDataBuilder.kt

@@ -1,9 +1,6 @@
 package com.tangem.domain.feedback
 
-import com.tangem.domain.feedback.models.BlockchainInfo
+import com.tangem.domain.feedback.models.*
-import com.tangem.domain.feedback.models.CardInfo
-import com.tangem.domain.feedback.models.PhoneInfo
-import com.tangem.domain.feedback.models.UserWalletsInfo
 import com.tangem.domain.feedback.utils.breakLine
 import com.tangem.domain.feedback.models.BlockchainInfo.Addresses as BlockchainAddresses
 
@@ -68,6 +65,24 @@ internal class FeedbackDataBuilder {
         builder.appendKeyValue("App version", phoneInfo.appVersion)
     }
 
+    fun addBlockchainError(info: BlockchainInfo, error: BlockchainErrorInfo) {
+        builder.appendKeyValue("Blockchain", info.blockchain)
+        builder.appendKeyValue("Derivation path", info.derivationPath)
+        builder.appendKeyValue("Host", info.host)
+        builder.appendKeyValue("Token", error.tokenSymbol)
+        builder.appendKeyValue("Error", error.errorMessage)
+
+        builder.appendDelimiter()
+
+        builder.appendAddresses(
+            key = "Source address${info.addresses.isMultiple(suffix = "es")}",
+            addresses = info.addresses,
+        )
+        builder.appendKeyValue("Destination address", error.destinationAddress)
+        builder.appendKeyValue("Amount", error.amount)
+        builder.appendKeyValue("Fee", error.fee ?: "Unable to receive")
+    }
+
     fun addDelimiter(): StringBuilder = builder.appendDelimiter()
 
     fun build(): String = builder.trimEnd().toString()

domain/feedback/src/main/java/com/tangem/domain/feedback/SaveBlockchainErrorUseCase.kt

@@ -0,0 +1,20 @@
+package com.tangem.domain.feedback
+
+import com.tangem.domain.feedback.models.BlockchainErrorInfo
+import com.tangem.domain.feedback.repository.FeedbackRepository
+
+/**
+ * Save last blockchain error
+ *
+ * @property feedbackRepository feedback repository
+ *
+[REDACTED_AUTHOR]
+ */
+class SaveBlockchainErrorUseCase(
+    private val feedbackRepository: FeedbackRepository,
+) {
+
+    fun invoke(error: BlockchainErrorInfo) {
+        feedbackRepository.saveBlockchainErrorInfo(error = error)
+    }
+}

domain/feedback/src/main/java/com/tangem/domain/feedback/models/BlockchainErrorInfo.kt

@@ -0,0 +1,22 @@
+package com.tangem.domain.feedback.models
+
+/**
+ * Information about blockchain's operation error
+ *
+ * @property errorMessage       message about error
+ * @property blockchainId       blockchain id
+ * @property derivationPath     derivation path
+ * @property destinationAddress destination address
+ * @property tokenSymbol        token symbol or null, if it isn't operation with token
+ * @property amount             amount
+ * @property fee                fee or null, if unable to get
+ */
+data class BlockchainErrorInfo(
+    val errorMessage: String,
+    val blockchainId: String,
+    val derivationPath: String?,
+    val destinationAddress: String,
+    val tokenSymbol: String?,
+    val amount: String,
+    val fee: String?,
+)

domain/feedback/src/main/java/com/tangem/domain/feedback/models/FeedbackEmailType.kt

@@ -0,0 +1,21 @@
+package com.tangem.domain.feedback.models
+
+/**
+ * Email feedback type
+ *
+[REDACTED_AUTHOR]
+ */
+sealed interface FeedbackEmailType {
+
+    /** User initiate request yourself. Example, button on DetailsScreen or OnboardingScreen */
+    data object DirectUserRequest : FeedbackEmailType
+
+    /** User rate the app as "can be better" */
+    data object RateCanBeBetter : FeedbackEmailType
+
+    /** User has problem with scanning */
+    data object ScanningProblem : FeedbackEmailType
+
+    /** User has problem with sending transaction */
+    data object TransactionSendingProblem : FeedbackEmailType
+}

domain/feedback/src/main/java/com/tangem/domain/feedback/repository/FeedbackRepository.kt

@@ -11,8 +11,14 @@ interface FeedbackRepository {
 
     suspend fun getBlockchainInfoList(): List<BlockchainInfo>
 
+    suspend fun getBlockchainInfo(blockchainId: String, derivationPath: String?): BlockchainInfo?
+
     fun getPhoneInfo(): PhoneInfo
 
+    fun saveBlockchainErrorInfo(error: BlockchainErrorInfo)
+
+    suspend fun getBlockchainErrorInfo(): BlockchainErrorInfo?
+
     suspend fun getAppLogs(): List<AppLogModel>
 
     suspend fun createLogFile(logs: String): File?

domain/feedback/src/main/java/com/tangem/domain/feedback/utils/AppLogsFormatter.kt

@@ -0,0 +1,61 @@
+package com.tangem.domain.feedback.utils
+
+import com.tangem.domain.feedback.models.AppLogModel
+import org.joda.time.DateTime
+import org.joda.time.format.DateTimeFormatter
+import org.joda.time.format.DateTimeFormatterBuilder
+import java.util.Locale
+
+/**
+ * App logs formatter
+ *
+[REDACTED_AUTHOR]
+ */
+internal class AppLogsFormatter {
+
+    private val dateFormatter = createDateFormatter()
+
+    /** Format [appLogs] to [String] */
+    fun format(appLogs: List<AppLogModel>): String {
+        val builder = StringBuilder()
+
+        var sum = 0
+        for (i in appLogs.lastIndex downTo 0) {
+            val log = appLogs[i]
+            val date = dateFormatter.print(DateTime(log.timestamp))
+
+            val formattedLog = "$date: ${log.message}\n"
+
+            sum += formattedLog.length
+            if (sum < GMAIL_MAX_FILE_SIZE) {
+                builder.insert(0, formattedLog)
+            } else {
+                break
+            }
+        }
+
+        return builder.toString()
+    }
+
+    // Example, 00.00 00:00:00.000
+    private fun createDateFormatter(): DateTimeFormatter {
+        return DateTimeFormatterBuilder()
+            .appendDayOfMonth(2)
+            .appendLiteral('.')
+            .appendMonthOfYear(2)
+            .appendLiteral(' ')
+            .appendHourOfDay(2)
+            .appendLiteral(':')
+            .appendMinuteOfHour(2)
+            .appendLiteral(':')
+            .appendSecondOfMinute(2)
+            .appendLiteral('.')
+            .appendMillisOfSecond(MIN_MILLIS_DIGITS)
+            .toFormatter()
+            .withLocale(Locale.getDefault())
+    }
+
+    private companion object {
+        const val MIN_MILLIS_DIGITS = 3
+    }
+}

domain/feedback/src/main/java/com/tangem/domain/feedback/utils/EmailMessageBodyResolver.kt

@@ -0,0 +1,70 @@
+package com.tangem.domain.feedback.utils
+
+import com.tangem.domain.feedback.FeedbackDataBuilder
+import com.tangem.domain.feedback.models.CardInfo
+import com.tangem.domain.feedback.models.FeedbackEmailType
+import com.tangem.domain.feedback.repository.FeedbackRepository
+
+/**
+ * Email message body resolver
+ *
+ * @property feedbackRepository feedback repository
+ *
+[REDACTED_AUTHOR]
+ */
+internal class EmailMessageBodyResolver(
+    private val feedbackRepository: FeedbackRepository,
+) {
+
+    /** Resolve email message body by [type] using [cardInfo] */
+    suspend fun resolve(type: FeedbackEmailType, cardInfo: CardInfo): String = with(FeedbackDataBuilder()) {
+        when (type) {
+            FeedbackEmailType.DirectUserRequest -> addUserRequestBody(cardInfo)
+            FeedbackEmailType.RateCanBeBetter -> addCardAndPhoneInfo(cardInfo)
+            FeedbackEmailType.ScanningProblem -> addScanningProblemBody()
+            FeedbackEmailType.TransactionSendingProblem -> addTransactionSendingProblemBody(cardInfo)
+        }
+
+        return build()
+    }
+
+    private suspend fun FeedbackDataBuilder.addUserRequestBody(cardInfo: CardInfo) {
+        addUserWalletsInfo(userWalletsInfo = feedbackRepository.getUserWalletsInfo())
+        addDelimiter()
+        addCardInfo(cardInfo)
+        addDelimiter()
+        addBlockchainInfoList(blockchainInfoList = feedbackRepository.getBlockchainInfoList())
+        addDelimiter()
+        addPhoneInfo(phoneInfo = feedbackRepository.getPhoneInfo())
+    }
+
+    private fun FeedbackDataBuilder.addScanningProblemBody() {
+        addPhoneInfo(phoneInfo = feedbackRepository.getPhoneInfo())
+    }
+
+    private suspend fun FeedbackDataBuilder.addTransactionSendingProblemBody(cardInfo: CardInfo) {
+        addCardInfo(cardInfo)
+        addDelimiter()
+
+        val blockchainError = feedbackRepository.getBlockchainErrorInfo()
+        val blockchainInfo = blockchainError?.let {
+            feedbackRepository.getBlockchainInfo(
+                blockchainId = blockchainError.blockchainId,
+                derivationPath = blockchainError.derivationPath,
+            )
+        }
+
+        if (blockchainInfo != null) {
+            addBlockchainError(blockchainInfo, blockchainError)
+            addDelimiter()
+        }
+
+        addPhoneInfo(phoneInfo = feedbackRepository.getPhoneInfo())
+    }
+
+    private fun FeedbackDataBuilder.addCardAndPhoneInfo(cardInfo: CardInfo) {
+        addCardInfo(cardInfo)
+        addDelimiter()
+        addPhoneInfo(phoneInfo = feedbackRepository.getPhoneInfo())
+    }
+}

domain/feedback/src/main/java/com/tangem/domain/feedback/utils/EmailMessageTitleResolver.kt

@@ -0,0 +1,26 @@
+package com.tangem.domain.feedback.utils
+
+import android.content.res.Resources
+import com.tangem.domain.feedback.R
+import com.tangem.domain.feedback.models.FeedbackEmailType
+
+/**
+ * Email message title resolver
+ *
+ * @property resources resources
+ *
+[REDACTED_AUTHOR]
+ */
+internal class EmailMessageTitleResolver(private val resources: Resources) {
+
+    /** Resolve email message title by [type] */
+    fun resolve(type: FeedbackEmailType): String {
+        return when (type) {
+            FeedbackEmailType.DirectUserRequest -> R.string.feedback_preface_support
+            FeedbackEmailType.RateCanBeBetter -> R.string.feedback_preface_rate_negative
+            FeedbackEmailType.ScanningProblem -> R.string.feedback_preface_scan_failed
+            FeedbackEmailType.TransactionSendingProblem -> R.string.feedback_preface_tx_failed
+        }
+            .let(resources::getString)
+    }
+}

domain/feedback/src/main/java/com/tangem/domain/feedback/utils/EmailSubjectResolver.kt

@@ -0,0 +1,33 @@
+package com.tangem.domain.feedback.utils
+
+import android.content.res.Resources
+import com.tangem.domain.feedback.R
+import com.tangem.domain.feedback.models.CardInfo
+import com.tangem.domain.feedback.models.FeedbackEmailType
+
+/**
+ * Email subject resolver
+ *
+ * @property resources resources
+ *
+[REDACTED_AUTHOR]
+ */
+internal class EmailSubjectResolver(private val resources: Resources) {
+
+    /** Resolve email message body by [type] using [cardInfo] */
+    fun resolve(type: FeedbackEmailType, cardInfo: CardInfo): String {
+        return when (type) {
+            FeedbackEmailType.DirectUserRequest -> {
+                if (cardInfo.isStart2Coin) {
+                    R.string.feedback_subject_support
+                } else {
+                    R.string.feedback_subject_support_tangem
+                }
+            }
+            FeedbackEmailType.RateCanBeBetter -> R.string.feedback_subject_rate_negative
+            FeedbackEmailType.ScanningProblem -> R.string.feedback_subject_scan_failed
+            FeedbackEmailType.TransactionSendingProblem -> R.string.feedback_subject_tx_failed
+        }
+            .let(resources::getString)
+    }
+}

domain/feedback/src/main/java/com/tangem/domain/feedback/utils/FeedbackConstants.kt

@@ -0,0 +1,6 @@
+package com.tangem.domain.feedback.utils
+
+internal const val GMAIL_MAX_FILE_SIZE = 24_900_000 // ≈ 25 MB
+
+internal const val START2COIN_SUPPORT_EMAIL = "cardsupport@start2coin.com"
+internal const val TANGEM_SUPPORT_EMAIL = "support@tangem.com"