package com.servicebook.ui.reportbug

import android.content.Intent
import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.animateContentSize
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.rememberScrollState
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.Button
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.MaterialTheme
import androidx.compose.material3.MediumTopAppBar
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Scaffold
import androidx.compose.material3.SnackbarHost
import androidx.compose.material3.SnackbarHostState
import androidx.compose.material3.Surface
import androidx.compose.material3.Switch
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.material3.TopAppBarDefaults
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.alpha
import androidx.compose.ui.input.nestedscroll.nestedScroll
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontWeight
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.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 scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()

    val noEmailAppMessage = stringResource(R.string.report_bug_no_email_app)
    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(
        modifier = Modifier.nestedScroll(scrollBehavior.nestedScrollConnection),
        snackbarHost = { SnackbarHost(snackbarHostState) },
        topBar = {
            MediumTopAppBar(
                title = { Text(stringResource(R.string.report_bug_title)) },
                navigationIcon = {
                    IconButton(onClick = { backStack.removeLastOrNull() }) {
                        Icon(
                            Icons.AutoMirrored.Outlined.ArrowBack,
                            contentDescription = stringResource(R.string.action_back),
                        )
                    }
                },
                scrollBehavior = scrollBehavior,
            )
        },
        bottomBar = {
            Surface(tonalElevation = 2.dp) {
                Row(
                    modifier =
                        Modifier
                            .fillMaxWidth()
                            .padding(16.dp),
                    verticalAlignment = Alignment.CenterVertically,
                ) {
                    TextButton(
                        onClick = { backStack.removeLastOrNull() },
                        modifier = Modifier.weight(1f),
                        enabled = !state.isSubmitting,
                    ) {
                        Text(stringResource(R.string.action_cancel))
                    }
                    Button(
                        onClick = { viewModel.onEvent(ReportBugEvent.Submit) },
                        enabled = state.canSubmit,
                        modifier = Modifier.weight(1f).testTag(TestTags.REPORT_BUG_SUBMIT_BUTTON),
                        shape = MaterialTheme.shapes.extraLarge,
                    ) {
                        Box(contentAlignment = Alignment.Center) {
                            Text(
                                stringResource(R.string.report_bug_submit),
                                modifier = Modifier.alpha(if (state.isSubmitting) 0f else 1f),
                            )
                            if (state.isSubmitting) {
                                CircularProgressIndicator(
                                    modifier = Modifier.size(24.dp).testTag(TestTags.REPORT_BUG_LOADING),
                                    strokeWidth = 2.dp,
                                    color = MaterialTheme.colorScheme.onPrimary,
                                )
                            }
                        }
                    }
                }
            }
        },
    ) { padding ->
        Column(
            modifier =
                Modifier
                    .fillMaxSize()
                    .padding(padding)
                    .verticalScroll(rememberScrollState())
                    .padding(16.dp),
        ) {
            // Type
            Text(
                text = stringResource(R.string.report_bug_type_section),
                style = MaterialTheme.typography.titleSmall,
                color = MaterialTheme.colorScheme.primary,
            )

            Row(modifier = Modifier.padding(vertical = 8.dp)) {
                Button(
                    onClick = { viewModel.onEvent(ReportBugEvent.TypeChanged(ReportType.BUG)) },
                    modifier = Modifier.weight(1f).testTag(TestTags.REPORT_BUG_TYPE_BUG),
                    enabled = !state.isSubmitting,
                    colors =
                        if (state.type == ReportType.BUG) {
                            androidx.compose.material3.ButtonDefaults.buttonColors()
                        } else {
                            androidx.compose.material3.ButtonDefaults.outlinedButtonColors()
                        },
                ) {
                    Text(stringResource(R.string.report_bug_type_bug))
                }
                Button(
                    onClick = { viewModel.onEvent(ReportBugEvent.TypeChanged(ReportType.SUGGESTION)) },
                    modifier = Modifier.weight(1f).testTag(TestTags.REPORT_BUG_TYPE_SUGGESTION),
                    enabled = !state.isSubmitting,
                    colors =
                        if (state.type == ReportType.SUGGESTION) {
                            androidx.compose.material3.ButtonDefaults.buttonColors()
                        } else {
                            androidx.compose.material3.ButtonDefaults.outlinedButtonColors()
                        },
                ) {
                    Text(stringResource(R.string.report_bug_type_suggestion))
                }
            }

            Spacer(Modifier.height(16.dp))

            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}/80", modifier = Modifier.fillMaxWidth())
                },
            )

            Spacer(Modifier.height(16.dp))

            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}/2000", modifier = Modifier.fillMaxWidth())
                },
            )

            Spacer(Modifier.height(16.dp))

            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,
            )

            Spacer(Modifier.height(24.dp))

            Card(
                modifier = Modifier.fillMaxWidth(),
                colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surfaceContainerLow),
            ) {
                Column(modifier = Modifier.animateContentSize()) {
                    Row(
                        modifier = Modifier.fillMaxWidth().padding(16.dp),
                        verticalAlignment = Alignment.CenterVertically,
                    ) {
                        Text(
                            stringResource(R.string.report_bug_device_info_payload),
                            style = MaterialTheme.typography.titleSmall,
                            modifier = Modifier.weight(1f),
                        )
                        IconButton(
                            onClick = { viewModel.onEvent(ReportBugEvent.ToggleDeviceInfo) },
                            modifier = Modifier.testTag(TestTags.REPORT_BUG_DEVICE_INFO_CARD),
                            enabled = !state.isSubmitting,
                        ) {
                            Icon(
                                if (state.showDeviceInfo) Icons.Default.ExpandLess else Icons.Default.ExpandMore,
                                contentDescription = null,
                            )
                        }
                    }
                    AnimatedVisibility(visible = state.showDeviceInfo) {
                        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())
                        }
                    }
                }
            }
        }
    }
}

@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)
    }
}