package com.example.ui.screens

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
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.filled.*
import androidx.compose.material.icons.outlined.*
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.example.data.model.*
import com.example.ui.components.CustomLabeledTextField
import com.example.ui.theme.*
import com.example.ui.util.Localization

@Composable
fun AdminPanelScreen(
    reports: List<ScamReport>,
    selectedTab: Int,
    onTabChange: (Int) -> Unit,
    reviewingReportId: String?,
    onSelectReportForReview: (String?) -> Unit,
    adminNotesInput: String,
    onAdminNotesChange: (String) -> Unit,
    onApproveReport: (reportId: String, publishWarning: Boolean) -> Unit,
    onRejectReport: (reportId: String) -> Unit,
    lang: AppLanguage,
    onBack: () -> Unit,
    modifier: Modifier = Modifier
) {
    val pendingReports = reports.filter { it.status == ReportStatus.PENDING_REVIEW || it.status == ReportStatus.UNDER_INVESTIGATION }
    val verifiedReports = reports.filter { it.status == ReportStatus.VERIFIED_WARNING_ISSUED || it.status == ReportStatus.LEGAL_ESCALATION }
    val rejectedReports = reports.filter { it.status == ReportStatus.REJECTED }

    val activeReportList = when (selectedTab) {
        0 -> pendingReports
        1 -> verifiedReports
        else -> rejectedReports
    }

    val reviewingReport = remember(reports, reviewingReportId) {
        if (reviewingReportId != null) reports.find { it.id == reviewingReportId } else null
    }

    if (reviewingReport != null) {
        // DETAILED ADMIN REVIEW DIALOG / SCREEN
        Scaffold(
            containerColor = MaterialTheme.colorScheme.background,
            topBar = {
                Surface(
                    color = BrandNavyPrimary,
                    modifier = Modifier.fillMaxWidth()
                ) {
                    Row(
                        modifier = Modifier
                            .fillMaxWidth()
                            .statusBarsPadding()
                            .padding(horizontal = 8.dp, vertical = 8.dp),
                        verticalAlignment = Alignment.CenterVertically
                    ) {
                        IconButton(onClick = { onSelectReportForReview(null) }) {
                            Icon(Icons.Default.ArrowBack, contentDescription = "Back", tint = Color.White)
                        }
                        Text(
                            text = "${if (lang == AppLanguage.BN) "অভিযোগ পর্যালোচনা:" else "Admin Review:"} ${reviewingReport.id}",
                            style = MaterialTheme.typography.titleMedium.copy(fontWeight = FontWeight.Bold, color = Color.White)
                        )
                    }
                }
            },
            bottomBar = {
                Surface(
                    color = MaterialTheme.colorScheme.surface,
                    tonalElevation = 8.dp,
                    border = androidx.compose.foundation.BorderStroke(1.dp, LightOutline),
                    modifier = Modifier.fillMaxWidth()
                ) {
                    Column(
                        modifier = Modifier
                            .fillMaxWidth()
                            .padding(16.dp)
                            .navigationBarsPadding(),
                        verticalArrangement = Arrangement.spacedBy(8.dp)
                    ) {
                        Row(
                            modifier = Modifier.fillMaxWidth(),
                            horizontalArrangement = Arrangement.spacedBy(10.dp)
                        ) {
                            OutlinedButton(
                                onClick = { onRejectReport(reviewingReport.id) },
                                colors = ButtonDefaults.outlinedButtonColors(contentColor = StatusWarningRed),
                                shape = RoundedCornerShape(10.dp),
                                modifier = Modifier
                                    .weight(1f)
                                    .height(48.dp)
                                    .testTag("btn_admin_reject")
                            ) {
                                Icon(Icons.Default.Close, contentDescription = null, modifier = Modifier.size(16.dp))
                                Spacer(modifier = Modifier.width(4.dp))
                                Text(if (lang == AppLanguage.BN) "বাতিল করুন" else "Reject")
                            }

                            Button(
                                onClick = { onApproveReport(reviewingReport.id, true) },
                                colors = ButtonDefaults.buttonColors(containerColor = StatusWarningRed),
                                shape = RoundedCornerShape(10.dp),
                                modifier = Modifier
                                    .weight(1.5f)
                                    .height(48.dp)
                                    .testTag("btn_admin_approve_warning")
                            ) {
                                Icon(Icons.Default.Campaign, contentDescription = null, modifier = Modifier.size(16.dp))
                                Spacer(modifier = Modifier.width(4.dp))
                                Text(if (lang == AppLanguage.BN) "সতর্কতা জারি করুন" else "Publish Warning")
                            }
                        }

                        FilledTonalButton(
                            onClick = { onApproveReport(reviewingReport.id, false) },
                            colors = ButtonDefaults.filledTonalButtonColors(
                                containerColor = BrandNavyPrimary.copy(alpha = 0.1f),
                                contentColor = BrandNavyPrimary
                            ),
                            shape = RoundedCornerShape(10.dp),
                            modifier = Modifier
                                .fillMaxWidth()
                                .height(44.dp)
                                .testTag("btn_admin_escalate_cid")
                        ) {
                            Icon(Icons.Default.Gavel, contentDescription = null, modifier = Modifier.size(16.dp))
                            Spacer(modifier = Modifier.width(6.dp))
                            Text(if (lang == AppLanguage.BN) "আইনগত ব্যবস্থার জন্য CID Cyber এ পাঠান" else "Escalate to CID Cyber Wing")
                        }
                    }
                }
            },
            modifier = modifier.fillMaxSize()
        ) { innerPadding ->
            Column(
                modifier = Modifier
                    .fillMaxSize()
                    .padding(innerPadding)
                    .verticalScroll(rememberScrollState())
                    .padding(16.dp),
                verticalArrangement = Arrangement.spacedBy(16.dp)
            ) {
                // Duplicate Pattern Alert Card if detected
                if (reviewingReport.duplicateMatchId != null) {
                    Surface(
                        color = StatusAmberBg,
                        shape = RoundedCornerShape(12.dp),
                        border = androidx.compose.foundation.BorderStroke(1.dp, StatusAmber.copy(alpha = 0.4f)),
                        modifier = Modifier.fillMaxWidth()
                    ) {
                        Row(
                            modifier = Modifier.padding(12.dp),
                            verticalAlignment = Alignment.CenterVertically
                        ) {
                            Icon(Icons.Default.ContentCopy, contentDescription = null, tint = StatusAmber)
                            Spacer(modifier = Modifier.width(10.dp))
                            Column {
                                Text(
                                    text = if (lang == AppLanguage.BN) "ডুপ্লিকেট চক্র শনাক্ত হয়েছে!" else "Duplicate Scam Pattern Detected!",
                                    style = MaterialTheme.typography.titleSmall.copy(fontWeight = FontWeight.Bold, color = StatusAmber)
                                )
                                Text(
                                    text = if (lang == AppLanguage.BN) "একই বিকাশ নম্বর ও পেজ লিংক পূর্বের একাধিক কমপ্লেইনে পাওয়া গেছে।" else "Same bKash wallet matches existing verified fraud cases.",
                                    style = MaterialTheme.typography.bodySmall.copy(color = Color(0xFF78350F), fontSize = 11.sp)
                                )
                            }
                        }
                    }
                }

                // Incident Details
                Surface(
                    color = MaterialTheme.colorScheme.surface,
                    shape = RoundedCornerShape(12.dp),
                    border = androidx.compose.foundation.BorderStroke(1.dp, LightOutline),
                    modifier = Modifier.fillMaxWidth()
                ) {
                    Column(modifier = Modifier.padding(16.dp)) {
                        Text(
                            text = reviewingReport.targetEntityName,
                            style = MaterialTheme.typography.titleMedium.copy(fontWeight = FontWeight.Bold)
                        )
                        Text(
                            text = "${reviewingReport.scamCategory} • ${reviewingReport.city}",
                            style = MaterialTheme.typography.bodySmall.copy(color = LightTextMuted)
                        )

                        Spacer(modifier = Modifier.height(12.dp))

                        Text(
                            text = if (lang == AppLanguage.BN) "যোগাযোগ ও ওয়ালেট নম্বর:" else "Contact / Payment Info:",
                            style = MaterialTheme.typography.labelSmall.copy(color = LightTextMuted)
                        )
                        Text(
                            text = reviewingReport.contactInfo,
                            style = MaterialTheme.typography.bodyMedium.copy(fontWeight = FontWeight.SemiBold)
                        )

                        Spacer(modifier = Modifier.height(8.dp))

                        Text(
                            text = if (lang == AppLanguage.BN) "হাতিয়ে নেওয়া অর্থ:" else "Amount Lost:",
                            style = MaterialTheme.typography.labelSmall.copy(color = LightTextMuted)
                        )
                        Text(
                            text = Localization.formatCurrency(reviewingReport.moneyLostBdt, lang),
                            style = MaterialTheme.typography.titleMedium.copy(color = StatusWarningRed, fontWeight = FontWeight.Bold)
                        )

                        Spacer(modifier = Modifier.height(12.dp))

                        Text(
                            text = if (lang == AppLanguage.BN) "ঘটনার বিবরণ:" else "Description:",
                            style = MaterialTheme.typography.labelSmall.copy(color = LightTextMuted)
                        )
                        Text(
                            text = reviewingReport.incidentDescription,
                            style = MaterialTheme.typography.bodyMedium.copy(lineHeight = 20.sp)
                        )

                        Spacer(modifier = Modifier.height(12.dp))

                        Text(
                            text = "রিপোর্টার: ${reviewingReport.reporterName} (${reviewingReport.reporterPhone})",
                            style = MaterialTheme.typography.labelSmall.copy(color = LightTextSecondary)
                        )
                    }
                }

                // Evidence Attachments Preview
                Surface(
                    color = MaterialTheme.colorScheme.surface,
                    shape = RoundedCornerShape(12.dp),
                    border = androidx.compose.foundation.BorderStroke(1.dp, LightOutline),
                    modifier = Modifier.fillMaxWidth()
                ) {
                    Column(modifier = Modifier.padding(16.dp)) {
                        Text(
                            text = if (lang == AppLanguage.BN) "সংযুক্ত প্রমাণাদি প্রিভিউ" else "Evidence Preview",
                            style = MaterialTheme.typography.titleSmall.copy(fontWeight = FontWeight.Bold)
                        )
                        Spacer(modifier = Modifier.height(8.dp))

                        listOf(
                            "📱 bKash TrxID SMS receipt verified (Trx: 9J28A4KL91)",
                            "💬 Messenger extortion chat transcript with timestamp",
                            "📄 Forged embassy visa document scan"
                        ).forEach { evidence ->
                            Surface(
                                color = LightSurfaceVariant,
                                shape = RoundedCornerShape(8.dp),
                                modifier = Modifier
                                    .fillMaxWidth()
                                    .padding(vertical = 4.dp)
                            ) {
                                Row(
                                    modifier = Modifier.padding(10.dp),
                                    verticalAlignment = Alignment.CenterVertically
                                ) {
                                    Icon(Icons.Default.Attachment, contentDescription = null, tint = BrandNavyPrimary, modifier = Modifier.size(18.dp))
                                    Spacer(modifier = Modifier.width(8.dp))
                                    Text(text = evidence, style = MaterialTheme.typography.bodySmall)
                                }
                            }
                        }
                    }
                }

                // Admin Investigation Notes Input
                CustomLabeledTextField(
                    label = if (lang == AppLanguage.BN) "তদন্ত নোট ও রেফারেন্স (Admin Notes)" else "Investigation Notes & Reference",
                    value = adminNotesInput,
                    onValueChange = onAdminNotesChange,
                    placeholder = if (lang == AppLanguage.BN) "যেমন: বিকাশ স্টেটমেন্ট যাচাই করা হয়েছে, সতর্কবার্তা প্রকাশের সুপারিশ।" else "e.g., Verified bKash statement, approved for public warning.",
                    singleLine = false,
                    maxLines = 3,
                    testTag = "input_admin_notes"
                )
            }
        }
        return
    }

    // MAIN ADMIN PANEL QUEUE LIST
    Scaffold(
        containerColor = MaterialTheme.colorScheme.background,
        modifier = modifier.fillMaxSize()
    ) { innerPadding ->
        Column(
            modifier = Modifier
                .fillMaxSize()
                .padding(innerPadding)
        ) {
            // Admin Tabs
            TabRow(
                selectedTabIndex = selectedTab,
                containerColor = MaterialTheme.colorScheme.surface,
                contentColor = BrandNavyPrimary
            ) {
                Tab(
                    selected = selectedTab == 0,
                    onClick = { onTabChange(0) },
                    text = { Text("${if (lang == AppLanguage.BN) "অপেক্ষমাণ" else "Pending"} (${pendingReports.size})") }
                )
                Tab(
                    selected = selectedTab == 1,
                    onClick = { onTabChange(1) },
                    text = { Text("${if (lang == AppLanguage.BN) "অনুমোদিত" else "Verified"} (${verifiedReports.size})") }
                )
                Tab(
                    selected = selectedTab == 2,
                    onClick = { onTabChange(2) },
                    text = { Text("${if (lang == AppLanguage.BN) "বাতিল" else "Rejected"} (${rejectedReports.size})") }
                )
            }

            if (activeReportList.isEmpty()) {
                Box(
                    modifier = Modifier
                        .fillMaxSize()
                        .padding(32.dp),
                    contentAlignment = Alignment.Center
                ) {
                    Text(
                        text = if (lang == AppLanguage.BN) "এই ট্যাবে কোনো রিপোর্ট নেই" else "No reports in this queue",
                        color = LightTextMuted
                    )
                }
            } else {
                LazyColumn(
                    modifier = Modifier
                        .fillMaxSize()
                        .padding(horizontal = 16.dp),
                    contentPadding = PaddingValues(top = 12.dp, bottom = 80.dp),
                    verticalArrangement = Arrangement.spacedBy(12.dp)
                ) {
                    items(activeReportList) { rep ->
                        Surface(
                            onClick = { onSelectReportForReview(rep.id) },
                            shape = RoundedCornerShape(12.dp),
                            color = MaterialTheme.colorScheme.surface,
                            border = androidx.compose.foundation.BorderStroke(1.dp, LightOutline),
                            shadowElevation = 2.dp,
                            modifier = Modifier
                                .fillMaxWidth()
                                .testTag("admin_queue_item_${rep.id}")
                        ) {
                            Column(modifier = Modifier.padding(14.dp)) {
                                Row(
                                    modifier = Modifier.fillMaxWidth(),
                                    horizontalArrangement = Arrangement.SpaceBetween,
                                    verticalAlignment = Alignment.CenterVertically
                                ) {
                                    Text(
                                        text = rep.id,
                                        style = MaterialTheme.typography.labelMedium.copy(
                                            color = BrandBlueAccent,
                                            fontWeight = FontWeight.Bold
                                        )
                                    )
                                    Text(
                                        text = Localization.getReportStatusText(rep.status, lang),
                                        style = MaterialTheme.typography.labelSmall.copy(
                                            color = when (rep.status) {
                                                ReportStatus.VERIFIED_WARNING_ISSUED -> StatusWarningRed
                                                ReportStatus.LEGAL_ESCALATION -> Color(0xFF7E22CE)
                                                ReportStatus.PENDING_REVIEW -> StatusAmber
                                                else -> LightTextMuted
                                            },
                                            fontWeight = FontWeight.Bold
                                        )
                                    )
                                }

                                Spacer(modifier = Modifier.height(6.dp))

                                Text(
                                    text = rep.targetEntityName,
                                    style = MaterialTheme.typography.titleSmall.copy(fontWeight = FontWeight.Bold)
                                )

                                Text(
                                    text = rep.incidentDescription,
                                    style = MaterialTheme.typography.bodySmall.copy(color = LightTextSecondary),
                                    maxLines = 2
                                )

                                Spacer(modifier = Modifier.height(8.dp))

                                Row(
                                    modifier = Modifier.fillMaxWidth(),
                                    horizontalArrangement = Arrangement.SpaceBetween,
                                    verticalAlignment = Alignment.CenterVertically
                                ) {
                                    Text(
                                        text = Localization.formatCurrency(rep.moneyLostBdt, lang),
                                        style = MaterialTheme.typography.labelSmall.copy(
                                            color = StatusWarningRed,
                                            fontWeight = FontWeight.Bold
                                        )
                                    )

                                    FilledTonalButton(
                                        onClick = { onSelectReportForReview(rep.id) },
                                        shape = RoundedCornerShape(8.dp),
                                        contentPadding = PaddingValues(horizontal = 12.dp, vertical = 4.dp)
                                    ) {
                                        Text(
                                            text = if (lang == AppLanguage.BN) "রিভিউ করুন ›" else "Review ›",
                                            fontSize = 11.sp,
                                            fontWeight = FontWeight.Bold
                                        )
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}