//
//  GameTableView.swift
//  Blackjack
//
//  Main game container view.
//

import SwiftUI
import CasinoKit

struct GameTableView: View {
    @State private var settings = GameSettings()
    @State private var gameState: GameState?
    @State private var selectedChip: ChipDenomination = .twentyFive
    
    // MARK: - Sheet State
    
    @State private var showSettings = false
    @State private var showRules = false
    @State private var showStats = false
    
    // MARK: - Environment
    
    @Environment(\.horizontalSizeClass) private var horizontalSizeClass
    @Environment(\.verticalSizeClass) private var verticalSizeClass
    
    /// Whether we're on iPad
    private var isIPad: Bool {
        horizontalSizeClass == .regular
    }
    
    /// Maximum content width based on device
    private var maxContentWidth: CGFloat {
        if isIPad {
            return verticalSizeClass == .compact
                ? Design.Size.maxContentWidthLandscape
                : Design.Size.maxContentWidthPortrait
        }
        return .infinity
    }
    
    // MARK: - Body
    
    var body: some View {
        Group {
            if let state = gameState {
                mainGameView(state: state)
            } else {
                ProgressView()
                    .task {
                        gameState = GameState(settings: settings)
                    }
            }
        }
        .sheet(isPresented: $showSettings) {
            SettingsView(settings: settings, gameState: gameState)
        }
        .sheet(isPresented: $showRules) {
            RulesHelpView()
        }
        .sheet(isPresented: $showStats) {
            if let state = gameState {
                StatisticsSheetView(state: state)
            }
        }
    }
    
    // MARK: - Main Game View
    
    @ViewBuilder
    private func mainGameView(state: GameState) -> some View {
        ZStack {
            // Background
            TableBackgroundView(
                feltColor: Color.Table.felt,
                edgeColor: Color.Table.feltDark
            )
            
            VStack(spacing: 0) {
                // Top bar
                TopBarView(
                    balance: state.balance,
                    secondaryInfo: settings.showCardsRemaining ? "\(state.engine.cardsRemaining)" : nil,
                    onReset: { state.resetGame() },
                    onSettings: { showSettings = true },
                    onHelp: { showRules = true },
                    onStats: { showStats = true }
                )
                .frame(maxWidth: maxContentWidth)
                
                // Table layout
                BlackjackTableView(
                    state: state,
                    onPlaceBet: { placeBet(state: state) }
                )
                .frame(maxWidth: maxContentWidth)
                
                Spacer()
                
                // Chip selector
                ChipSelectorView(
                    selectedChip: $selectedChip,
                    balance: state.balance,
                    maxBet: state.settings.maxBet
                )
                .frame(maxWidth: maxContentWidth)
                .padding(.bottom, Design.Spacing.small)
                
                // Action buttons
                ActionButtonsView(state: state)
                    .frame(maxWidth: maxContentWidth)
                    .padding(.bottom, Design.Spacing.medium)
            }
            .frame(maxWidth: .infinity)
            
            // Result banner overlay
            if state.showResultBanner, let result = state.lastRoundResult {
                ResultBannerView(
                    result: result,
                    currentBalance: state.balance,
                    minBet: state.settings.minBet,
                    onNewRound: { state.newRound() },
                    onPlayAgain: { state.resetGame() }
                )
            }
            
            // Confetti for blackjack
            if state.showResultBanner && (state.lastRoundResult?.wasBlackjack ?? false) {
                ConfettiView()
            }
            
            // Game over
            if state.isGameOver && !state.showResultBanner {
                GameOverView(
                    roundsPlayed: state.roundsPlayed,
                    onPlayAgain: { state.resetGame() }
                )
            }
        }
    }
    
    // MARK: - Betting
    
    private func placeBet(state: GameState) {
        state.placeBet(amount: selectedChip.rawValue)
    }
}

// MARK: - Action Buttons View

struct ActionButtonsView: View {
    @Bindable var state: GameState
    
    // Scaled metrics
    @ScaledMetric(relativeTo: .headline) private var buttonFontSize: CGFloat = Design.BaseFontSize.large
    @ScaledMetric(relativeTo: .body) private var iconSize: CGFloat = Design.IconSize.large
    
    // Fixed height to prevent layout shifts
    private let containerHeight: CGFloat = 120
    
    var body: some View {
        ZStack {
            Color.clear
                .frame(height: containerHeight)
            
            VStack(spacing: Design.Spacing.medium) {
                // Primary actions
                HStack(spacing: Design.Spacing.medium) {
                    switch state.currentPhase {
                    case .betting:
                        bettingButtons
                    case .playerTurn:
                        playerTurnButtons
                    case .roundComplete:
                        // Empty - handled by result banner
                        EmptyView()
                    default:
                        // Dealing, dealer turn - show nothing
                        EmptyView()
                    }
                }
                .animation(.spring(duration: Design.Animation.quick), value: state.currentPhase)
            }
        }
        .padding(.horizontal, Design.Spacing.large)
    }
    
    // MARK: - Betting Phase Buttons
    
    @ViewBuilder
    private var bettingButtons: some View {
        if state.currentBet > 0 {
            ActionButton(
                String(localized: "Clear"),
                icon: "xmark.circle",
                style: .destructive
            ) {
                state.clearBet()
            }
            
            if state.currentBet >= state.settings.minBet {
                ActionButton(
                    String(localized: "Deal"),
                    icon: "play.fill",
                    style: .primary
                ) {
                    Task { await state.deal() }
                }
            }
        }
    }
    
    // MARK: - Player Turn Buttons
    
    @ViewBuilder
    private var playerTurnButtons: some View {
        // Top row: Hit, Stand
        HStack(spacing: Design.Spacing.medium) {
            if state.canHit {
                ActionButton(
                    String(localized: "Hit"),
                    style: .custom(Color.Button.hit)
                ) {
                    Task { await state.hit() }
                }
            }
            
            if state.canStand {
                ActionButton(
                    String(localized: "Stand"),
                    style: .custom(Color.Button.stand)
                ) {
                    Task { await state.stand() }
                }
            }
        }
        
        // Bottom row: Double, Split, Surrender
        HStack(spacing: Design.Spacing.medium) {
            if state.canDouble {
                ActionButton(
                    String(localized: "Double"),
                    style: .custom(Color.Button.doubleDown)
                ) {
                    Task { await state.doubleDown() }
                }
            }
            
            if state.canSplit {
                ActionButton(
                    String(localized: "Split"),
                    style: .custom(Color.Button.split)
                ) {
                    Task { await state.split() }
                }
            }
            
            if state.canSurrender {
                ActionButton(
                    String(localized: "Surrender"),
                    style: .custom(Color.Button.surrender)
                ) {
                    Task { await state.surrender() }
                }
            }
        }
    }
}

// MARK: - Action Button

struct ActionButton: View {
    let title: String
    let icon: String?
    let style: ButtonStyle
    let action: () -> Void
    
    enum ButtonStyle {
        case primary
        case destructive
        case secondary
        case custom(Color)
        
        var foregroundColor: Color {
            switch self {
            case .primary: return .black
            case .destructive, .secondary, .custom: return .white
            }
        }
        
        var backgroundColor: Color {
            switch self {
            case .primary: return .yellow
            case .destructive: return .red.opacity(Design.Opacity.heavy)
            case .secondary: return .white.opacity(Design.Opacity.hint)
            case .custom(let color): return color
            }
        }
    }
    
    init(_ title: String, icon: String? = nil, style: ButtonStyle = .primary, action: @escaping () -> Void) {
        self.title = title
        self.icon = icon
        self.style = style
        self.action = action
    }
    
    var body: some View {
        Button(action: action) {
            HStack(spacing: Design.Spacing.small) {
                if let icon = icon {
                    Image(systemName: icon)
                }
                Text(title)
            }
            .font(.system(size: Design.BaseFontSize.medium, weight: .bold))
            .foregroundStyle(style.foregroundColor)
            .padding(.horizontal, Design.Spacing.xLarge)
            .padding(.vertical, Design.Spacing.medium)
            .background(
                Capsule()
                    .fill(style.backgroundColor)
            )
            .shadow(color: style.backgroundColor.opacity(Design.Opacity.light), radius: Design.Shadow.radiusMedium)
        }
        .accessibilityLabel(title)
    }
}

// MARK: - Preview

#Preview {
    GameTableView()
}