//
//  PlayerHandView.swift
//  Blackjack
//
//  Displays player hands in a horizontally scrollable container.
//

import SwiftUI
import CasinoKit

// MARK: - Player Hands Container

/// Container for multiple player hands with horizontal scrolling.
struct PlayerHandsView: View {
    let hands: [BlackjackHand]
    let activeHandIndex: Int
    let isPlayerTurn: Bool
    let showCardCount: Bool
    let cardWidth: CGFloat
    let cardSpacing: CGFloat
    
    /// Total card count across all hands - used to trigger scroll when hitting
    private var totalCardCount: Int {
        hands.reduce(0) { $0 + $1.cards.count }
    }
    
    var body: some View {
        GeometryReader { geometry in
            ScrollViewReader { proxy in
                ScrollView(.horizontal, showsIndicators: false) {
                    HStack(spacing: Design.Spacing.large) {
                        // Display hands in reverse order (right to left play order)
                        // Visual order: Hand 3, Hand 2, Hand 1 (left to right)
                        // Play order: Hand 1 played first (rightmost), then Hand 2, etc.
                        ForEach(hands.indices.reversed(), id: \.self) { index in
                            PlayerHandView(
                                hand: hands[index],
                                isActive: index == activeHandIndex && isPlayerTurn,
                                showCardCount: showCardCount,
                                // Hand numbers: rightmost (index 0) is Hand 1, played first
                                handNumber: hands.count > 1 ? index + 1 : nil,
                                cardWidth: cardWidth,
                                cardSpacing: cardSpacing
                            )
                            .id(index)
                        }
                    }
                    .padding(.horizontal, Design.Spacing.large)
                    .frame(minWidth: geometry.size.width)
                }
                .scrollClipDisabled()
                .scrollBounceBehavior(.basedOnSize)
                .onChange(of: activeHandIndex) { _, newIndex in
                    scrollToHand(proxy: proxy, index: newIndex)
                }
                .onChange(of: totalCardCount) { _, _ in
                    // Scroll to active hand when cards are added (hit)
                    scrollToHand(proxy: proxy, index: activeHandIndex)
                }
                .onChange(of: hands.count) { _, _ in
                    // Scroll to active hand when split occurs
                    scrollToHand(proxy: proxy, index: activeHandIndex)
                }
                .onAppear {
                    scrollToHand(proxy: proxy, index: activeHandIndex)
                }
            }
        }
        .frame(height: Design.Size.playerHandsHeight)
    }
    
    private func scrollToHand(proxy: ScrollViewProxy, index: Int) {
        withAnimation(.easeInOut(duration: Design.Animation.quick)) {
            proxy.scrollTo(index, anchor: .center)
        }
    }
}

// MARK: - Single Player Hand

/// Displays a single player hand with cards, value, and result.
struct PlayerHandView: View {
    let hand: BlackjackHand
    let isActive: Bool
    let showCardCount: Bool
    let handNumber: Int?
    let cardWidth: CGFloat
    let cardSpacing: CGFloat
    
    @ScaledMetric(relativeTo: .headline) private var labelFontSize: CGFloat = Design.Size.handLabelFontSize
    @ScaledMetric(relativeTo: .caption) private var handNumberSize: CGFloat = Design.Size.handNumberFontSize
    
    var body: some View {
        VStack(spacing: Design.Spacing.small) {
            // Cards with container
            HStack(spacing: hand.cards.isEmpty ? Design.Spacing.small : cardSpacing) {
                if hand.cards.isEmpty {
                    CardPlaceholderView(width: cardWidth)
                    CardPlaceholderView(width: cardWidth)
                } else {
                    ForEach(hand.cards.indices, id: \.self) { index in
                        CardView(
                            card: hand.cards[index],
                            isFaceUp: true,
                            cardWidth: cardWidth
                        )
                        .overlay(alignment: .bottomLeading) {
                            if showCardCount {
                                HiLoCountBadge(card: hand.cards[index])
                            }
                        }
                        .zIndex(Double(index))
                    }
                }
            }
            .padding(.horizontal, Design.Spacing.medium)
            .padding(.vertical, Design.Spacing.medium)
            .background(
                RoundedRectangle(cornerRadius: Design.CornerRadius.medium)
                    .fill(Color.Table.feltDark.opacity(Design.Opacity.light))
                    .overlay(
                        RoundedRectangle(cornerRadius: Design.CornerRadius.medium)
                            .strokeBorder(
                                isActive ? Color.Hand.active : Color.white.opacity(Design.Opacity.hint),
                                lineWidth: isActive ? Design.LineWidth.thick : Design.LineWidth.thin
                            )
                    )
            )
            .contentShape(Rectangle())
            .animation(.easeInOut(duration: Design.Animation.quick), value: isActive)
            
            // Hand info
            HStack(spacing: Design.Spacing.small) {
                if let number = handNumber {
                    Text(String(localized: "Hand \(number)"))
                        .font(.system(size: handNumberSize, weight: .medium))
                        .foregroundStyle(.white.opacity(Design.Opacity.medium))
                }
                
                if !hand.cards.isEmpty {
                    Text(hand.valueDisplay)
                        .font(.system(size: labelFontSize, weight: .bold, design: .rounded))
                        .foregroundStyle(valueColor)
                }
                
                if hand.isDoubledDown {
                    Image(systemName: "xmark.circle.fill")
                        .font(.system(size: Design.Size.handIconSize))
                        .foregroundStyle(.purple)
                }
            }
            
            // Result badge
            if let result = hand.result {
                Text(result.displayText)
                    .font(.system(size: labelFontSize, weight: .black))
                    .foregroundStyle(result.color)
                    .padding(.horizontal, Design.Size.hintPaddingH)
                    .padding(.vertical, Design.Size.hintPaddingV)
                    .background(
                        Capsule()
                            .fill(result.color.opacity(Design.Opacity.hint))
                    )
            }
            
            // Bet amount
            if hand.bet > 0 {
                HStack(spacing: Design.Spacing.xSmall) {
                    Image(systemName: "dollarsign.circle.fill")
                        .font(.system(size: Design.Size.handIconSize))
                        .foregroundStyle(.yellow)
                    Text("\(hand.bet * (hand.isDoubledDown ? 2 : 1))")
                        .font(.system(size: handNumberSize, weight: .bold, design: .rounded))
                        .foregroundStyle(.yellow)
                }
            }
        }
        .accessibilityElement(children: .ignore)
        .accessibilityLabel(playerAccessibilityLabel)
    }
    
    // MARK: - Computed Properties
    
    private var valueColor: Color {
        if hand.isBlackjack { return .yellow }
        if hand.isBusted { return .red }
        if hand.value == 21 { return .green }
        return .white
    }
    
    private var playerAccessibilityLabel: String {
        let cardsDescription = hand.cards.map { $0.accessibilityDescription }.joined(separator: ", ")
        var label = String(localized: "Player hand: \(cardsDescription). Value: \(hand.valueDisplay)")
        if let result = hand.result {
            label += ". \(result.displayText)"
        }
        return label
    }
}

// MARK: - Previews

#Preview("Single Hand - Empty") {
    ZStack {
        Color.Table.felt.ignoresSafeArea()
        PlayerHandsView(
            hands: [BlackjackHand()],
            activeHandIndex: 0,
            isPlayerTurn: true,
            showCardCount: false,
            cardWidth: 60,
            cardSpacing: -20
        )
    }
}

#Preview("Single Hand - Cards") {
    ZStack {
        Color.Table.felt.ignoresSafeArea()
        PlayerHandsView(
            hands: [BlackjackHand(cards: [
                Card(suit: .clubs, rank: .eight),
                Card(suit: .hearts, rank: .nine)
            ], bet: 100)],
            activeHandIndex: 0,
            isPlayerTurn: true,
            showCardCount: false,
            cardWidth: 60,
            cardSpacing: -20
        )
    }
}

#Preview("Split Hands") {
    ZStack {
        Color.Table.felt.ignoresSafeArea()
        PlayerHandsView(
            hands: [
                BlackjackHand(cards: [
                    Card(suit: .clubs, rank: .eight),
                    Card(suit: .spades, rank: .jack)
                ], bet: 100),
                BlackjackHand(cards: [
                    Card(suit: .hearts, rank: .eight),
                    Card(suit: .diamonds, rank: .five)
                ], bet: 100),
                BlackjackHand(cards: [
                    Card(suit: .hearts, rank: .eight),
                    Card(suit: .diamonds, rank: .five)
                ], bet: 100),
                BlackjackHand(cards: [
                    Card(suit: .hearts, rank: .eight),
                    Card(suit: .diamonds, rank: .five)
                ], bet: 100)
            ],
            activeHandIndex: 1,
            isPlayerTurn: true,
            showCardCount: true,
            cardWidth: 60,
            cardSpacing: -20
        )
    }
}