package com.servicebook.ui.reportbug

import android.content.Intent
import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.core.tween
import androidx.compose.animation.expandVertically
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.shrinkVertically
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.imePadding
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.foundation.verticalScroll
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.automirrored.outlined.ArrowBack
import androidx.compose.material.icons.filled.ExpandLess
import androidx.compose.material.icons.filled.ExpandMore
import androidx.compose.material3.Card
import androidx.compose.material3.CardDefaults
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.LinearProgressIndicator
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Scaffold
import androidx.compose.material3.SegmentedButton
import androidx.compose.material3.SegmentedButtonDefaults
import androidx.compose.material3.SingleChoiceSegmentedButtonRow
import androidx.compose.material3.SnackbarHost
import androidx.compose.material3.SnackbarHostState
import androidx.compose.material3.Switch
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.role
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.semantics.stateDescription
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.input.KeyboardType
import androidx.compose.ui.unit.dp
import androidx.core.net.toUri
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import androidx.lifecycle.viewmodel.compose.viewModel
import androidx.navigation3.runtime.NavBackStack
import androidx.navigation3.runtime.NavKey
import com.servicebook.R
import com.servicebook.ServiceBookApplication
import com.servicebook.ui.TestTags
import com.servicebook.ui.theme.appTopAppBarColors
import com.servicebook.ui.util.ViewModelFactory

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun ReportBugScreen(
    backStack: NavBackStack<NavKey>,
    viewModel: ReportBugViewModel =
        viewModel(
            factory = ViewModelFactory(LocalContext.current.applicationContext as ServiceBookApplication),
        ),
) {
    val state by viewModel.state.collectAsStateWithLifecycle()
    val context = LocalContext.current
    val snackbarHostState = remember { SnackbarHostState() }
    val scrollState = rememberScrollState()

    val noEmailAppMessage = stringResource(R.string.report_bug_no_email_app)
    val expandedDescription = stringResource(R.string.a11y_state_expanded)
    val collapsedDescription = stringResource(R.string.a11y_state_collapsed)

    LaunchedEffect(Unit) {
        viewModel.effects.collect { effect ->
            when (effect) {
                is ReportBugEffect.ShowSnackbar -> snackbarHostState.showSnackbar(effect.message)
                ReportBugEffect.NavigateBack -> backStack.removeLastOrNull()
                is ReportBugEffect.FallbackToEmail -> {
                    val intent =
                        Intent(Intent.ACTION_SENDTO).apply {
                            data = "mailto:".toUri()
                            putExtra(Intent.EXTRA_EMAIL, arrayOf(effect.recipient))
                            putExtra(Intent.EXTRA_SUBJECT, effect.subject)
                            putExtra(Intent.EXTRA_TEXT, effect.body)
                        }
                    try {
                        context.startActivity(intent)
                    } catch (_: Exception) {
                        snackbarHostState.showSnackbar(noEmailAppMessage)
                    }
                }
            }
        }
    }

    Scaffold(
        snackbarHost = { SnackbarHost(snackbarHostState) },
        topBar = {
            TopAppBar(
                title = {
                    Text(
                        text = stringResource(R.string.report_bug_title),
                        modifier = Modifier.testTag(TestTags.SCREEN_TITLE),
                    )
                },
                navigationIcon = {
                    IconButton(onClick = { backStack.removeLastOrNull() }, enabled = !state.isSubmitting) {
                        Icon(
                            Icons.AutoMirrored.Outlined.ArrowBack,
                            contentDescription = stringResource(R.string.action_back),
                        )
                    }
                },
                actions = {
                    if (state.isSubmitting) {
                        CircularProgressIndicator(
                            modifier = Modifier.size(24.dp).padding(end = 16.dp).testTag(TestTags.REPORT_BUG_LOADING),
                            strokeWidth = 2.dp,
                        )
                    } else {
                        TextButton(
                            onClick = { viewModel.onEvent(ReportBugEvent.Submit) },
                            enabled = state.canSubmit,
                            modifier = Modifier.testTag(TestTags.REPORT_BUG_SUBMIT_BUTTON),
                        ) {
                            Text(stringResource(R.string.report_bug_submit))
                        }
                    }
                },
                colors = appTopAppBarColors(),
            )
        },
    ) { padding ->
        Column(
            modifier =
                Modifier
                    .fillMaxSize()
                    .padding(padding)
                    .imePadding()
                    .verticalScroll(scrollState)
                    .padding(horizontal = 16.dp, vertical = 12.dp),
            verticalArrangement = Arrangement.spacedBy(12.dp),
        ) {
            if (state.isSubmitting) {
                LinearProgressIndicator(
                    modifier = Modifier.fillMaxWidth(),
                )
            }

            // Type
            Text(
                text = stringResource(R.string.report_bug_type_section),
                style = MaterialTheme.typography.titleSmall,
                color = MaterialTheme.colorScheme.primary,
            )

            SingleChoiceSegmentedButtonRow(modifier = Modifier.fillMaxWidth()) {
                SegmentedButton(
                    selected = state.type == ReportType.BUG,
                    onClick = { viewModel.onEvent(ReportBugEvent.TypeChanged(ReportType.BUG)) },
                    shape = SegmentedButtonDefaults.itemShape(index = 0, count = 2),
                    enabled = !state.isSubmitting,
                    label = { Text(stringResource(R.string.report_bug_type_bug)) },
                    modifier = Modifier.testTag(TestTags.REPORT_BUG_TYPE_BUG),
                )
                SegmentedButton(
                    selected = state.type == ReportType.SUGGESTION,
                    onClick = { viewModel.onEvent(ReportBugEvent.TypeChanged(ReportType.SUGGESTION)) },
                    shape = SegmentedButtonDefaults.itemShape(index = 1, count = 2),
                    enabled = !state.isSubmitting,
                    label = { Text(stringResource(R.string.report_bug_type_suggestion)) },
                    modifier = Modifier.testTag(TestTags.REPORT_BUG_TYPE_SUGGESTION),
                )
            }

            OutlinedTextField(
                value = state.summary,
                onValueChange = { viewModel.onEvent(ReportBugEvent.SummaryChanged(it)) },
                label = { Text(stringResource(R.string.report_bug_summary)) },
                modifier = Modifier.fillMaxWidth().testTag(TestTags.REPORT_BUG_SUMMARY_FIELD),
                singleLine = true,
                enabled = !state.isSubmitting,
                supportingText = {
                    Text(
                        "${state.summary.length}/${ReportBugViewModel.MAX_SUMMARY_LENGTH}",
                        modifier = Modifier.fillMaxWidth(),
                    )
                },
            )

            OutlinedTextField(
                value = state.description,
                onValueChange = { viewModel.onEvent(ReportBugEvent.DescriptionChanged(it)) },
                label = { Text(stringResource(R.string.report_bug_description)) },
                modifier =
                    Modifier
                        .fillMaxWidth()
                        .height(160.dp)
                        .testTag(TestTags.REPORT_BUG_DESCRIPTION_FIELD),
                enabled = !state.isSubmitting,
                supportingText = {
                    Text(
                        "${state.description.length}/${ReportBugViewModel.MAX_DESCRIPTION_LENGTH}",
                        modifier = Modifier.fillMaxWidth(),
                    )
                },
            )

            OutlinedTextField(
                value = state.contactEmail,
                onValueChange = { viewModel.onEvent(ReportBugEvent.ContactEmailChanged(it)) },
                label = { Text(stringResource(R.string.report_bug_contact_email)) },
                modifier = Modifier.fillMaxWidth().testTag(TestTags.REPORT_BUG_EMAIL_FIELD),
                singleLine = true,
                enabled = !state.isSubmitting,
                keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Email),
                isError = state.isEmailInvalid,
                supportingText =
                    if (state.isEmailInvalid) {
                        { Text(stringResource(R.string.report_bug_contact_email_invalid)) }
                    } else {
                        null
                    },
            )

            Card(
                modifier = Modifier.fillMaxWidth(),
                colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surfaceContainerLow),
            ) {
                Column {
                    Row(
                        modifier =
                            Modifier
                                .fillMaxWidth()
                                .clickable(
                                    enabled = !state.isSubmitting,
                                    onClickLabel =
                                        stringResource(
                                            if (state.showDeviceInfo) R.string.action_show_less else R.string.action_show_more,
                                        ),
                                ) {
                                    viewModel.onEvent(ReportBugEvent.ToggleDeviceInfo)
                                }
                                .padding(16.dp)
                                .testTag(TestTags.REPORT_BUG_DEVICE_INFO_CARD)
                                .semantics {
                                    stateDescription =
                                        if (state.showDeviceInfo) {
                                            expandedDescription
                                        } else {
                                            collapsedDescription
                                        }
                                    role = Role.Button
                                },
                        verticalAlignment = Alignment.CenterVertically,
                    ) {
                        Text(
                            stringResource(R.string.report_bug_device_info_payload),
                            style = MaterialTheme.typography.titleSmall,
                            modifier = Modifier.weight(1f),
                        )
                        Icon(
                            if (state.showDeviceInfo) Icons.Default.ExpandLess else Icons.Default.ExpandMore,
                            contentDescription = null,
                        )
                    }
                    AnimatedVisibility(
                        visible = state.showDeviceInfo,
                        enter =
                            expandVertically(
                                animationSpec = tween(250),
                                expandFrom = Alignment.Top,
                            ) + fadeIn(tween(250)),
                        exit =
                            shrinkVertically(
                                animationSpec = tween(250),
                                shrinkTowards = Alignment.Top,
                            ) + fadeOut(tween(250)),
                    ) {
                        Column(modifier = Modifier.padding(start = 16.dp, end = 16.dp, bottom = 16.dp)) {
                            Row(verticalAlignment = Alignment.CenterVertically, modifier = Modifier.padding(bottom = 8.dp)) {
                                Text(
                                    stringResource(R.string.report_bug_include_device_info),
                                    style = MaterialTheme.typography.bodyMedium,
                                    modifier = Modifier.weight(1f),
                                )
                                Switch(
                                    checked = state.includeDeviceInfo,
                                    onCheckedChange = { viewModel.onEvent(ReportBugEvent.IncludeDeviceInfoChanged(it)) },
                                    modifier = Modifier.testTag(TestTags.REPORT_BUG_DEVICE_INFO_TOGGLE),
                                    enabled = !state.isSubmitting,
                                )
                            }
                            DeviceInfoItem(stringResource(R.string.report_bug_app_version), state.appVersion)
                            DeviceInfoItem(stringResource(R.string.report_bug_android_version), state.androidVersion)
                            DeviceInfoItem(stringResource(R.string.report_bug_locale), state.locale)
                            DeviceInfoItem(stringResource(R.string.report_bug_device_model), state.deviceModel)
                            DeviceInfoItem(stringResource(R.string.report_bug_vault_configured), state.vaultConfigured.toString())
                        }
                    }
                }
            }

            if (!state.crashReportingEnabled) {
                Text(
                    text = stringResource(R.string.report_bug_sentry_opt_out_disclosure),
                    style = MaterialTheme.typography.labelSmall,
                    color = MaterialTheme.colorScheme.onSurfaceVariant,
                    modifier = Modifier.fillMaxWidth().testTag(TestTags.REPORT_BUG_DISCLOSURE),
                )
            }
        }
    }
}

@Composable
private fun DeviceInfoItem(
    label: String,
    value: String,
) {
    Row(modifier = Modifier.padding(vertical = 2.dp)) {
        Text(text = "$label: ", style = MaterialTheme.typography.bodySmall, fontWeight = FontWeight.Bold)
        Text(text = value, style = MaterialTheme.typography.bodySmall)
    }
}