package com.craigvg.lichun_android.ui.screens.settings

import android.content.ClipData
import android.content.ClipboardManager
import android.content.Context
import android.content.Intent
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.verticalScroll
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.automirrored.filled.ArrowBack
import androidx.compose.material.icons.filled.*
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.hilt.navigation.compose.hiltViewModel
import com.craigvg.lichun_android.ui.theme.AppColors
import com.craigvg.lichun_android.ui.theme.AppSpacing
import com.craigvg.lichun_android.ui.theme.AppTypography
import com.craigvg.lichun_android.viewmodel.GameStateViewModel
import androidx.lifecycle.compose.collectAsStateWithLifecycle

/**
 * Data export screen for GDPR compliance
 * Ported from iOS DataExportView.swift
 */
enum class ExportStatus {
    IDLE,
    REQUESTING,
    PROCESSING,
    READY,
    ERROR
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun DataExportScreen(
    gameStateViewModel: GameStateViewModel = hiltViewModel(),
    onBack: () -> Unit = {}
) {
    val exportPayload by gameStateViewModel.dataExportPayload.collectAsStateWithLifecycle()
    val currentError by gameStateViewModel.currentError.collectAsStateWithLifecycle()
    val context = LocalContext.current
    var exportStatus by remember { mutableStateOf(ExportStatus.IDLE) }
    var exportData by remember { mutableStateOf("") }
    var errorMessage by remember { mutableStateOf("") }

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text("Export Data", style = AppTypography.headline) },
                navigationIcon = {
                    IconButton(onClick = onBack) {
                        Icon(
                            imageVector = Icons.AutoMirrored.Filled.ArrowBack,
                            contentDescription = "Back",
                            tint = AppColors.primaryText
                        )
                    }
                },
                colors = TopAppBarDefaults.topAppBarColors(
                    containerColor = AppColors.surfaceElevated
                )
            )
        },
        containerColor = AppColors.background
    ) { paddingValues ->
        Column(
            modifier = Modifier
                .fillMaxSize()
                .padding(paddingValues)
                .verticalScroll(rememberScrollState())
        ) {
            // Header Icon
            Column(
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(top = AppSpacing.lg),
                horizontalAlignment = Alignment.CenterHorizontally
            ) {
                Icon(
                    imageVector = Icons.Default.Download,
                    contentDescription = null,
                    tint = AppColors.info,
                    modifier = Modifier.size(60.dp)
                )

                Spacer(modifier = Modifier.height(AppSpacing.md))

                Text(
                    text = "Export Your Data",
                    style = AppTypography.title,
                    color = AppColors.primaryText
                )

                Spacer(modifier = Modifier.height(AppSpacing.sm))

                Text(
                    text = "Request a copy of all your personal data stored in BaoLife. This includes your account information, character data, gameplay history, and more.",
                    style = AppTypography.body,
                    color = AppColors.secondaryText,
                    textAlign = TextAlign.Center,
                    modifier = Modifier.padding(horizontal = AppSpacing.md)
                )
            }

            Spacer(modifier = Modifier.height(AppSpacing.lg))

            // What's Included Section
            Column(
                modifier = Modifier.padding(horizontal = AppSpacing.md)
            ) {
                Text(
                    text = "What's Included",
                    style = AppTypography.headline,
                    color = AppColors.primaryText
                )

                Spacer(modifier = Modifier.height(AppSpacing.md))

                DataIncludedRow(
                    icon = Icons.Default.Person,
                    title = "Account Information",
                    description = "Username, email, registration date"
                )
                Spacer(modifier = Modifier.height(AppSpacing.sm))
                DataIncludedRow(
                    icon = Icons.Default.DirectionsWalk,
                    title = "Character Data",
                    description = "All character details, attributes, appearance"
                )
                Spacer(modifier = Modifier.height(AppSpacing.sm))
                DataIncludedRow(
                    icon = Icons.Default.TrendingUp,
                    title = "Game Progress",
                    description = "Achievements, statistics, records"
                )
                Spacer(modifier = Modifier.height(AppSpacing.sm))
                DataIncludedRow(
                    icon = Icons.Default.Favorite,
                    title = "Relationships",
                    description = "All relationships and affinity levels"
                )
                Spacer(modifier = Modifier.height(AppSpacing.sm))
                DataIncludedRow(
                    icon = Icons.Default.Chat,
                    title = "Conversations",
                    description = "Chat history with characters"
                )
                Spacer(modifier = Modifier.height(AppSpacing.sm))
                DataIncludedRow(
                    icon = Icons.Default.ShoppingCart,
                    title = "Purchase History",
                    description = "All in-app purchase records"
                )
            }

            Spacer(modifier = Modifier.height(AppSpacing.lg))

            // Status Display
            if (exportStatus != ExportStatus.IDLE) {
                Card(
                    modifier = Modifier
                        .fillMaxWidth()
                        .padding(horizontal = AppSpacing.md),
                    shape = RoundedCornerShape(AppSpacing.cornerRadius),
                    colors = CardDefaults.cardColors(
                        containerColor = AppColors.surfaceElevated
                    )
                ) {
                    Column(
                        modifier = Modifier
                            .fillMaxWidth()
                            .padding(AppSpacing.md),
                        horizontalAlignment = Alignment.CenterHorizontally
                    ) {
                        when (exportStatus) {
                            ExportStatus.REQUESTING, ExportStatus.PROCESSING -> {
                                CircularProgressIndicator(
                                    color = AppColors.primary,
                                    modifier = Modifier.size(40.dp)
                                )
                                Spacer(modifier = Modifier.height(AppSpacing.md))
                                Text(
                                    text = if (exportStatus == ExportStatus.REQUESTING)
                                        "Requesting export..."
                                    else
                                        "Preparing your data...",
                                    style = AppTypography.body,
                                    color = AppColors.secondaryText
                                )
                                if (exportStatus == ExportStatus.PROCESSING) {
                                    Text(
                                        text = "This may take a few minutes",
                                        style = AppTypography.caption,
                                        color = AppColors.secondaryText
                                    )
                                }
                            }
                            ExportStatus.READY -> {
                                Icon(
                                    imageVector = Icons.Default.CheckCircle,
                                    contentDescription = null,
                                    tint = AppColors.success,
                                    modifier = Modifier.size(50.dp)
                                )
                                Spacer(modifier = Modifier.height(AppSpacing.sm))
                                Text(
                                    text = "Export Ready!",
                                    style = AppTypography.headline,
                                    color = AppColors.success
                                )
                                Spacer(modifier = Modifier.height(AppSpacing.md))

                                Button(
                                    onClick = {
                                        val sendIntent = Intent().apply {
                                            action = Intent.ACTION_SEND
                                            putExtra(Intent.EXTRA_TEXT, exportData)
                                            type = "text/plain"
                                        }
                                        val shareIntent = Intent.createChooser(sendIntent, "Share Export")
                                        context.startActivity(shareIntent)
                                    },
                                    modifier = Modifier.fillMaxWidth(),
                                    colors = ButtonDefaults.buttonColors(
                                        containerColor = AppColors.info
                                    ),
                                    shape = RoundedCornerShape(AppSpacing.cornerRadius)
                                ) {
                                    Icon(
                                        imageVector = Icons.Default.Share,
                                        contentDescription = null
                                    )
                                    Spacer(modifier = Modifier.width(AppSpacing.xs))
                                    Text("Share Export")
                                }

                                Spacer(modifier = Modifier.height(AppSpacing.sm))

                                OutlinedButton(
                                    onClick = {
                                        val clipboard = context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
                                        val clip = ClipData.newPlainText("BaoLife Export", exportData)
                                        clipboard.setPrimaryClip(clip)
                                    },
                                    modifier = Modifier.fillMaxWidth(),
                                    shape = RoundedCornerShape(AppSpacing.cornerRadius)
                                ) {
                                    Icon(
                                        imageVector = Icons.Default.ContentCopy,
                                        contentDescription = null
                                    )
                                    Spacer(modifier = Modifier.width(AppSpacing.xs))
                                    Text("Copy to Clipboard")
                                }
                            }
                            ExportStatus.ERROR -> {
                                Icon(
                                    imageVector = Icons.Default.Error,
                                    contentDescription = null,
                                    tint = AppColors.error,
                                    modifier = Modifier.size(50.dp)
                                )
                                Spacer(modifier = Modifier.height(AppSpacing.sm))
                                Text(
                                    text = "Export Failed",
                                    style = AppTypography.headline,
                                    color = AppColors.error
                                )
                                Text(
                                    text = errorMessage,
                                    style = AppTypography.body,
                                    color = AppColors.secondaryText,
                                    textAlign = TextAlign.Center
                                )
                            }
                            else -> {}
                        }
                    }
                }

                Spacer(modifier = Modifier.height(AppSpacing.md))
            }

            // Request Button
            if (exportStatus == ExportStatus.IDLE || exportStatus == ExportStatus.ERROR) {
                Button(
                    onClick = {
                        exportStatus = ExportStatus.REQUESTING
                        errorMessage = ""
                        gameStateViewModel.clearDataExportPayload()
                        gameStateViewModel.requestDataExport()
                    },
                    modifier = Modifier
                        .fillMaxWidth()
                        .padding(horizontal = AppSpacing.md),
                    colors = ButtonDefaults.buttonColors(
                        containerColor = AppColors.info
                    ),
                    shape = RoundedCornerShape(AppSpacing.cornerRadius)
                ) {
                    Icon(
                        imageVector = Icons.Default.Download,
                        contentDescription = null
                    )
                    Spacer(modifier = Modifier.width(AppSpacing.xs))
                    Text(
                        text = if (exportStatus == ExportStatus.ERROR) "Try Again" else "Request Export"
                    )
                }
            }

            Spacer(modifier = Modifier.height(AppSpacing.md))

            // GDPR Notice
            Card(
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(horizontal = AppSpacing.md),
                shape = RoundedCornerShape(AppSpacing.cornerRadius),
                colors = CardDefaults.cardColors(
                    containerColor = AppColors.info.copy(alpha = 0.1f)
                )
            ) {
                Column(
                    modifier = Modifier.padding(AppSpacing.md)
                ) {
                    Row(
                        verticalAlignment = Alignment.CenterVertically
                    ) {
                        Icon(
                            imageVector = Icons.Default.Info,
                            contentDescription = null,
                            tint = AppColors.info,
                            modifier = Modifier.size(20.dp)
                        )
                        Spacer(modifier = Modifier.width(AppSpacing.xs))
                        Text(
                            text = "Your Rights",
                            style = AppTypography.headline,
                            color = AppColors.primaryText
                        )
                    }

                    Spacer(modifier = Modifier.height(AppSpacing.sm))

                    Text(
                        text = "Under GDPR and data protection laws, you have the right to access and receive a copy of your personal data in a portable format. This export will be provided in JSON format, which can be opened with any text editor.",
                        style = AppTypography.body,
                        color = AppColors.secondaryText
                    )

                    Spacer(modifier = Modifier.height(AppSpacing.xs))

                    Text(
                        text = "Processing time: Usually immediate, up to 30 days for complex requests.",
                        style = AppTypography.caption,
                        color = AppColors.secondaryText
                    )
                }
            }

            Spacer(modifier = Modifier.height(AppSpacing.xl))
        }
    }

    LaunchedEffect(exportStatus) {
        if (exportStatus == ExportStatus.REQUESTING) {
            exportStatus = ExportStatus.PROCESSING
        }
    }

    LaunchedEffect(exportPayload) {
        if (!exportPayload.isNullOrBlank()) {
            exportData = exportPayload!!
            exportStatus = ExportStatus.READY
        }
    }

    LaunchedEffect(currentError, exportStatus) {
        if (exportStatus == ExportStatus.REQUESTING || exportStatus == ExportStatus.PROCESSING) {
            currentError?.let {
                errorMessage = it.userMessage
                exportStatus = ExportStatus.ERROR
            }
        }
    }
}

@Composable
private fun DataIncludedRow(
    icon: ImageVector,
    title: String,
    description: String
) {
    Card(
        modifier = Modifier.fillMaxWidth(),
        shape = RoundedCornerShape(AppSpacing.cornerRadius),
        colors = CardDefaults.cardColors(
            containerColor = AppColors.info.copy(alpha = 0.08f)
        )
    ) {
        Row(
            modifier = Modifier.padding(AppSpacing.md),
            verticalAlignment = Alignment.Top
        ) {
            Icon(
                imageVector = icon,
                contentDescription = null,
                tint = AppColors.info,
                modifier = Modifier.size(20.dp)
            )
            Spacer(modifier = Modifier.width(AppSpacing.sm))
            Column {
                Text(
                    text = title,
                    style = AppTypography.bodyBold,
                    color = AppColors.primaryText
                )
                Text(
                    text = description,
                    style = AppTypography.caption,
                    color = AppColors.secondaryText
                )
            }
        }
    }
}