package com.aistudio.bonjuteri.jwlry.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
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.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.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
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.outlined.Diamond
import androidx.compose.material3.ButtonDefaults
import androidx.compose.material3.Card
import androidx.compose.material3.CardDefaults
import androidx.compose.material3.FilledTonalButton
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
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.text.style.TextOverflow
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.BadgeBestSellerText
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.BadgeNewText
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.PrimaryBlack
import com.aistudio.bonjuteri.jwlry.ui.theme.PureWhite
import com.aistudio.bonjuteri.jwlry.ui.theme.SurfaceBorder
import com.aistudio.bonjuteri.jwlry.ui.theme.WarningAmber

@OptIn(ExperimentalLayoutApi::class)
@Composable
fun ProductCard(
    product: Product,
    isFavorite: Boolean,
    onProductClick: (Product) -> Unit,
    onFavoriteToggle: (Product) -> Unit,
    onAddToCart: (Product) -> Unit,
    modifier: Modifier = Modifier
) {
    Card(
        modifier = modifier
            .fillMaxWidth()
            .clip(RoundedCornerShape(12.dp))
            .clickable { onProductClick(product) }
            .testTag("product_card_${product.id}"),
        shape = RoundedCornerShape(12.dp),
        colors = CardDefaults.cardColors(containerColor = PureWhite),
        elevation = CardDefaults.cardElevation(defaultElevation = 2.dp)
    ) {
        Column {
            // Image + Badges + Favorite Button
            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
                            .fillMaxWidth()
                            .aspectRatio(1f),
                        contentScale = ContentScale.Crop
                    )
                } else {
                    Box(
                        modifier = Modifier
                            .fillMaxWidth()
                            .aspectRatio(1f),
                        contentAlignment = Alignment.Center
                    ) {
                        Icon(
                            imageVector = Icons.Outlined.Diamond,
                            contentDescription = "Görsel yok",
                            tint = GoldPrimary.copy(alpha = 0.5f),
                            modifier = Modifier.size(48.dp)
                        )
                    }
                }

                // Badges in Top Left
                FlowRow(
                    modifier = Modifier
                        .align(Alignment.TopStart)
                        .padding(6.dp),
                    horizontalArrangement = Arrangement.spacedBy(4.dp),
                    verticalArrangement = Arrangement.spacedBy(4.dp)
                ) {
                    if (product.isNew) {
                        BadgeLabel(text = "YENİ", bg = BadgeNewBg, fg = BadgeNewText)
                    }
                    if (product.isBestSeller) {
                        BadgeLabel(text = "ÇOK SATAN", bg = BadgeBestSellerBg, fg = BadgeBestSellerText)
                    }
                    if (product.hasDiscount) {
                        BadgeLabel(
                            text = "%${product.discountPercent} İNDİRİM",
                            bg = BadgeDiscountBg,
                            fg = BadgeDiscountText
                        )
                    }
                }

                // Favorite Heart in Top Right
                IconButton(
                    onClick = { onFavoriteToggle(product) },
                    modifier = Modifier
                        .align(Alignment.TopEnd)
                        .padding(4.dp)
                        .size(34.dp)
                        .background(PureWhite.copy(alpha = 0.9f), CircleShape)
                        .testTag("fav_button_${product.id}")
                ) {
                    Icon(
                        imageVector = if (isFavorite) Icons.Filled.Favorite else Icons.Filled.FavoriteBorder,
                        contentDescription = "Favoriye Ekle",
                        tint = if (isFavorite) ErrorRed else MutedGrey,
                        modifier = Modifier.size(18.dp)
                    )
                }

                // Out of stock overlay if stock == 0
                if (!product.isInStock) {
                    Box(
                        modifier = Modifier
                            .align(Alignment.BottomCenter)
                            .fillMaxWidth()
                            .background(PrimaryBlack.copy(alpha = 0.75f))
                            .padding(vertical = 4.dp),
                        contentAlignment = Alignment.Center
                    ) {
                        Text(
                            text = "TÜKENDİ",
                            color = PureWhite,
                            fontSize = 11.sp,
                            fontWeight = FontWeight.Bold
                        )
                    }
                }
            }

            // Product Details
            Column(
                modifier = Modifier.padding(10.dp)
            ) {
                // Category
                Text(
                    text = product.category.uppercase(),
                    style = MaterialTheme.typography.labelSmall.copy(
                        fontSize = 9.sp,
                        fontWeight = FontWeight.Bold,
                        color = MutedGrey,
                        letterSpacing = 0.8.sp
                    ),
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis
                )

                Spacer(modifier = Modifier.height(2.dp))

                // Title
                Text(
                    text = product.title,
                    style = MaterialTheme.typography.titleMedium.copy(
                        fontWeight = FontWeight.SemiBold,
                        fontSize = 13.sp,
                        lineHeight = 17.sp,
                        color = PrimaryBlack
                    ),
                    maxLines = 2,
                    overflow = TextOverflow.Ellipsis,
                    modifier = Modifier.height(34.dp)
                )

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

                // Stock warning if low stock
                if (product.isInStock && product.stock in 1..4) {
                    Text(
                        text = "Son ${product.stock} ürün!",
                        style = MaterialTheme.typography.labelSmall.copy(
                            color = WarningAmber,
                            fontWeight = FontWeight.Bold,
                            fontSize = 10.sp
                        )
                    )
                }

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

                // Pricing
                Row(
                    verticalAlignment = Alignment.Bottom,
                    modifier = Modifier.fillMaxWidth()
                ) {
                    Text(
                        text = product.formattedPrice,
                        style = MaterialTheme.typography.titleLarge.copy(
                            fontWeight = FontWeight.Bold,
                            fontSize = 15.sp,
                            color = PrimaryBlack
                        )
                    )

                    if (product.hasDiscount && product.formattedOldPrice != null) {
                        Spacer(modifier = Modifier.width(6.dp))
                        Text(
                            text = product.formattedOldPrice!!,
                            style = MaterialTheme.typography.bodySmall.copy(
                                textDecoration = TextDecoration.LineThrough,
                                color = MutedGrey,
                                fontSize = 11.sp
                            )
                        )
                    }
                }

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

                // Quick Add to Cart Button
                FilledTonalButton(
                    onClick = { onAddToCart(product) },
                    enabled = product.isInStock,
                    modifier = Modifier
                        .fillMaxWidth()
                        .height(36.dp)
                        .testTag("add_to_cart_${product.id}"),
                    shape = RoundedCornerShape(8.dp),
                    colors = ButtonDefaults.filledTonalButtonColors(
                        containerColor = GoldSubtle,
                        contentColor = PrimaryBlack
                    )
                ) {
                    Icon(
                        imageVector = Icons.Filled.AddShoppingCart,
                        contentDescription = "Sepete Ekle",
                        modifier = Modifier.size(16.dp),
                        tint = PrimaryBlack
                    )
                    Spacer(modifier = Modifier.width(6.dp))
                    Text(
                        text = if (product.isInStock) "Sepete Ekle" else "Tükendi",
                        fontSize = 12.sp,
                        fontWeight = FontWeight.Bold
                    )
                }
            }
        }
    }
}

@Composable
private fun BadgeLabel(text: String, bg: Color, fg: Color) {
    Box(
        modifier = Modifier
            .background(bg, RoundedCornerShape(4.dp))
            .padding(horizontal = 6.dp, vertical = 2.dp)
    ) {
        Text(
            text = text,
            color = fg,
            fontSize = 9.sp,
            fontWeight = FontWeight.Bold,
            letterSpacing = 0.5.sp
        )
    }
}