package com.aistudio.bonjuteri.jwlry.ui.screens

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ExperimentalLayoutApi
import androidx.compose.foundation.layout.FlowRow
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.aspectRatio
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.layout.width
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.shape.CircleShape
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.Add
import androidx.compose.material.icons.filled.AddShoppingCart
import androidx.compose.material.icons.filled.Favorite
import androidx.compose.material.icons.filled.FavoriteBorder
import androidx.compose.material.icons.filled.Remove
import androidx.compose.material.icons.outlined.CheckCircle
import androidx.compose.material.icons.outlined.Diamond
import androidx.compose.material.icons.outlined.LocalShipping
import androidx.compose.material.icons.outlined.Security
import androidx.compose.material3.Button
import androidx.compose.material3.ButtonDefaults
import androidx.compose.material3.Card
import androidx.compose.material3.CardDefaults
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.SnackbarHostState
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.material3.TopAppBarDefaults
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableLongStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.setValue
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.layout.ContentScale
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextDecoration
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import coil.compose.AsyncImage
import coil.request.ImageRequest
import com.aistudio.bonjuteri.jwlry.model.Product
import com.aistudio.bonjuteri.jwlry.ui.theme.BadgeBestSellerBg
import com.aistudio.bonjuteri.jwlry.ui.theme.BadgeDiscountBg
import com.aistudio.bonjuteri.jwlry.ui.theme.BadgeDiscountText
import com.aistudio.bonjuteri.jwlry.ui.theme.BadgeNewBg
import com.aistudio.bonjuteri.jwlry.ui.theme.ErrorRed
import com.aistudio.bonjuteri.jwlry.ui.theme.GoldPrimary
import com.aistudio.bonjuteri.jwlry.ui.theme.GoldSubtle
import com.aistudio.bonjuteri.jwlry.ui.theme.LightSurface
import com.aistudio.bonjuteri.jwlry.ui.theme.MutedGrey
import com.aistudio.bonjuteri.jwlry.ui.theme.OffWhite
import com.aistudio.bonjuteri.jwlry.ui.theme.PrimaryBlack
import com.aistudio.bonjuteri.jwlry.ui.theme.PureWhite
import com.aistudio.bonjuteri.jwlry.ui.theme.SuccessGreen
import com.aistudio.bonjuteri.jwlry.ui.theme.SurfaceBorder
import com.aistudio.bonjuteri.jwlry.ui.theme.WarningAmber
import kotlinx.coroutines.launch

@OptIn(ExperimentalMaterial3Api::class, ExperimentalLayoutApi::class)
@Composable
fun ProductDetailScreen(
    product: Product,
    isFavorite: Boolean,
    onBackClick: () -> Unit,
    onFavoriteToggle: () -> Unit,
    onAddToCart: (Long) -> Unit,
    snackbarHostState: SnackbarHostState,
    modifier: Modifier = Modifier
) {
    var quantity by remember { mutableLongStateOf(1L) }
    val scope = rememberCoroutineScope()

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text(text = product.category, style = MaterialTheme.typography.titleMedium) },
                navigationIcon = {
                    IconButton(onClick = onBackClick) {
                        Icon(
                            imageVector = Icons.AutoMirrored.Filled.ArrowBack,
                            contentDescription = "Geri"
                        )
                    }
                },
                actions = {
                    IconButton(onClick = onFavoriteToggle) {
                        Icon(
                            imageVector = if (isFavorite) Icons.Filled.Favorite else Icons.Filled.FavoriteBorder,
                            contentDescription = "Favoriye Ekle",
                            tint = if (isFavorite) ErrorRed else PrimaryBlack
                        )
                    }
                },
                colors = TopAppBarDefaults.topAppBarColors(containerColor = PureWhite)
            )
        },
        bottomBar = {
            Surface(
                color = PureWhite,
                shadowElevation = 8.dp,
                modifier = Modifier.fillMaxWidth()
            ) {
                Row(
                    modifier = Modifier
                        .fillMaxWidth()
                        .padding(horizontal = 16.dp, vertical = 12.dp),
                    verticalAlignment = Alignment.CenterVertically
                ) {
                    // Quantity selector
                    if (product.isInStock) {
                        Row(
                            verticalAlignment = Alignment.CenterVertically,
                            modifier = Modifier
                                .border(1.dp, SurfaceBorder, RoundedCornerShape(8.dp))
                                .padding(horizontal = 4.dp, vertical = 2.dp)
                        ) {
                            IconButton(
                                onClick = { if (quantity > 1) quantity-- },
                                enabled = quantity > 1,
                                modifier = Modifier.size(32.dp)
                            ) {
                                Icon(Icons.Filled.Remove, contentDescription = "Azalt", modifier = Modifier.size(16.dp))
                            }
                            Text(
                                text = quantity.toString(),
                                fontWeight = FontWeight.Bold,
                                modifier = Modifier.padding(horizontal = 8.dp)
                            )
                            IconButton(
                                onClick = { if (quantity < product.stock) quantity++ },
                                enabled = quantity < product.stock,
                                modifier = Modifier.size(32.dp)
                            ) {
                                Icon(Icons.Filled.Add, contentDescription = "Artır", modifier = Modifier.size(16.dp))
                            }
                        }
                    }

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

                    Button(
                        onClick = {
                            onAddToCart(quantity)
                            scope.launch {
                                snackbarHostState.showSnackbar("$quantity adet ${product.title} sepete eklendi!")
                            }
                        },
                        enabled = product.isInStock,
                        modifier = Modifier
                            .weight(1f)
                            .height(48.dp)
                            .testTag("detail_add_to_cart_btn"),
                        shape = RoundedCornerShape(10.dp),
                        colors = ButtonDefaults.buttonColors(
                            containerColor = PrimaryBlack,
                            contentColor = PureWhite
                        )
                    ) {
                        Icon(
                            imageVector = Icons.Filled.AddShoppingCart,
                            contentDescription = null,
                            modifier = Modifier.size(18.dp)
                        )
                        Spacer(modifier = Modifier.width(8.dp))
                        Text(
                            text = if (product.isInStock) "Sepete Ekle (${Product.formatCurrency(product.price * quantity)})" else "Tükendi",
                            fontWeight = FontWeight.Bold,
                            fontSize = 14.sp
                        )
                    }
                }
            }
        }
    ) { padding ->
        Column(
            modifier = modifier
                .fillMaxSize()
                .padding(padding)
                .background(PureWhite)
                .verticalScroll(rememberScrollState())
        ) {
            // Product Hero Image
            Box(
                modifier = Modifier
                    .fillMaxWidth()
                    .aspectRatio(1f)
                    .background(LightSurface)
            ) {
                if (product.imageUrl.isNotBlank()) {
                    AsyncImage(
                        model = ImageRequest.Builder(LocalContext.current)
                            .data(product.imageUrl)
                            .crossfade(true)
                            .build(),
                        contentDescription = product.title,
                        modifier = Modifier.fillMaxSize(),
                        contentScale = ContentScale.Crop
                    )
                } else {
                    Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
                        Icon(
                            imageVector = Icons.Outlined.Diamond,
                            contentDescription = null,
                            tint = GoldPrimary,
                            modifier = Modifier.size(72.dp)
                        )
                    }
                }
            }

            Column(modifier = Modifier.padding(16.dp)) {
                // Badges
                FlowRow(
                    horizontalArrangement = Arrangement.spacedBy(6.dp),
                    verticalArrangement = Arrangement.spacedBy(4.dp)
                ) {
                    if (product.isNew) {
                        Box(
                            modifier = Modifier
                                .background(BadgeNewBg, RoundedCornerShape(4.dp))
                                .padding(horizontal = 8.dp, vertical = 3.dp)
                        ) {
                            Text("YENİ", color = PureWhite, fontSize = 10.sp, fontWeight = FontWeight.Bold)
                        }
                    }
                    if (product.isBestSeller) {
                        Box(
                            modifier = Modifier
                                .background(BadgeBestSellerBg, RoundedCornerShape(4.dp))
                                .padding(horizontal = 8.dp, vertical = 3.dp)
                        ) {
                            Text("ÇOK SATAN", color = PureWhite, fontSize = 10.sp, fontWeight = FontWeight.Bold)
                        }
                    }
                    if (product.hasDiscount) {
                        Box(
                            modifier = Modifier
                                .background(BadgeDiscountBg, RoundedCornerShape(4.dp))
                                .padding(horizontal = 8.dp, vertical = 3.dp)
                        ) {
                            Text(
                                "%${product.discountPercent} İNDİRİM",
                                color = BadgeDiscountText,
                                fontSize = 10.sp,
                                fontWeight = FontWeight.Bold
                            )
                        }
                    }
                }

                Spacer(modifier = Modifier.height(10.dp))

                // Product Title
                Text(
                    text = product.title,
                    style = MaterialTheme.typography.headlineSmall.copy(
                        fontWeight = FontWeight.Bold,
                        color = PrimaryBlack
                    )
                )

                Spacer(modifier = Modifier.height(4.dp))

                // SKU & Category
                Row(verticalAlignment = Alignment.CenterVertically) {
                    Text(
                        text = "SKU: ${product.sku.ifBlank { "BNJ-001" }}",
                        style = MaterialTheme.typography.bodySmall.copy(color = MutedGrey)
                    )
                    Spacer(modifier = Modifier.width(12.dp))
                    Text(
                        text = "• Kategori: ${product.category}",
                        style = MaterialTheme.typography.bodySmall.copy(color = MutedGrey)
                    )
                }

                Spacer(modifier = Modifier.height(14.dp))

                // Price display
                Row(verticalAlignment = Alignment.Bottom) {
                    Text(
                        text = product.formattedPrice,
                        style = MaterialTheme.typography.headlineMedium.copy(
                            fontWeight = FontWeight.Black,
                            color = PrimaryBlack
                        )
                    )
                    if (product.hasDiscount && product.formattedOldPrice != null) {
                        Spacer(modifier = Modifier.width(10.dp))
                        Text(
                            text = product.formattedOldPrice!!,
                            style = MaterialTheme.typography.titleMedium.copy(
                                textDecoration = TextDecoration.LineThrough,
                                color = MutedGrey
                            )
                        )
                    }
                }

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

                // Stock indicator
                Row(verticalAlignment = Alignment.CenterVertically) {
                    Box(
                        modifier = Modifier
                            .size(10.dp)
                            .background(
                                color = if (product.isInStock) SuccessGreen else ErrorRed,
                                shape = CircleShape
                            )
                    )
                    Spacer(modifier = Modifier.width(8.dp))
                    Text(
                        text = if (product.isInStock) "Stokta Var (${product.stock} adet)" else "Stokta Tükendi",
                        style = MaterialTheme.typography.bodyMedium.copy(
                            fontWeight = FontWeight.SemiBold,
                            color = if (product.isInStock) SuccessGreen else ErrorRed
                        )
                    )
                }

                Spacer(modifier = Modifier.height(20.dp))

                // Trust highlights
                Card(
                    modifier = Modifier.fillMaxWidth(),
                    colors = CardDefaults.cardColors(containerColor = OffWhite),
                    shape = RoundedCornerShape(12.dp)
                ) {
                    Column(modifier = Modifier.padding(14.dp), verticalArrangement = Arrangement.spacedBy(10.dp)) {
                        Row(verticalAlignment = Alignment.CenterVertically) {
                            Icon(Icons.Outlined.LocalShipping, contentDescription = null, tint = GoldPrimary, modifier = Modifier.size(20.dp))
                            Spacer(modifier = Modifier.width(10.dp))
                            Text("500 TL Üzeri Ücretsiz Hızlı Kargo", style = MaterialTheme.typography.bodySmall.copy(fontWeight = FontWeight.Medium))
                        }
                        Row(verticalAlignment = Alignment.CenterVertically) {
                            Icon(Icons.Outlined.CheckCircle, contentDescription = null, tint = GoldPrimary, modifier = Modifier.size(20.dp))
                            Spacer(modifier = Modifier.width(10.dp))
                            Text("%100 Orijinal BONJUTERİ Tasarımı", style = MaterialTheme.typography.bodySmall.copy(fontWeight = FontWeight.Medium))
                        }
                        Row(verticalAlignment = Alignment.CenterVertically) {
                            Icon(Icons.Outlined.Security, contentDescription = null, tint = GoldPrimary, modifier = Modifier.size(20.dp))
                            Spacer(modifier = Modifier.width(10.dp))
                            Text("Özel Lüks Hediye Kutusu & Garanti Sertifikası", style = MaterialTheme.typography.bodySmall.copy(fontWeight = FontWeight.Medium))
                        }
                    }
                }

                Spacer(modifier = Modifier.height(20.dp))

                // Description
                Text(
                    text = "Ürün Açıklaması",
                    style = MaterialTheme.typography.titleMedium.copy(
                        fontWeight = FontWeight.Bold,
                        color = PrimaryBlack
                    )
                )

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

                Text(
                    text = product.description.ifBlank { "Özenle işlenmiş kaliteli işçilik ve zarafeti bir araya getiren özel tasarım BONJUTERİ mücevher parçası." },
                    style = MaterialTheme.typography.bodyMedium.copy(
                        color = MutedGrey,
                        lineHeight = 22.sp
                    )
                )

                Spacer(modifier = Modifier.height(24.dp))
            }
        }
    }
}