//
//  RulesHelpView.swift
//  Blackjack
//
//  Game rules and how to play guide.
//

import SwiftUI
import CasinoKit

struct RulesHelpView: View {
    @Environment(\.dismiss) private var dismiss
    @State private var currentPage = 0
    
    private let pages: [RulePage] = [
        RulePage(
            title: String(localized: "Objective"),
            icon: "target",
            content: [
                String(localized: "Beat the dealer by getting a hand value closer to 21 without going over."),
                String(localized: "If you go over 21, you 'bust' and lose immediately."),
                String(localized: "If the dealer busts and you haven't, you win.")
            ]
        ),
        RulePage(
            title: String(localized: "Card Values"),
            icon: "suit.spade.fill",
            content: [
                String(localized: "2-10: Face value"),
                String(localized: "Jack, Queen, King: 10"),
                String(localized: "Ace: 1 or 11 (whichever helps your hand)"),
                String(localized: "A 'soft' hand has an Ace counting as 11.")
            ]
        ),
        RulePage(
            title: String(localized: "Blackjack"),
            icon: "star.fill",
            content: [
                String(localized: "An Ace + 10-value card dealt initially is 'Blackjack'."),
                String(localized: "Blackjack pays 3:2 (1.5x your bet)."),
                String(localized: "If both you and dealer have Blackjack, it's a push (tie).")
            ]
        ),
        RulePage(
            title: String(localized: "Actions"),
            icon: "hand.tap.fill",
            content: [
                String(localized: "Hit: Take another card"),
                String(localized: "Stand: Keep your current hand"),
                String(localized: "Double Down: Double your bet, take one card, then stand"),
                String(localized: "Split: If you have two cards of the same value, split into two hands"),
                String(localized: "Surrender: Give up half your bet and end the hand")
            ]
        ),
        RulePage(
            title: String(localized: "Insurance"),
            icon: "shield.fill",
            content: [
                String(localized: "Offered when dealer shows an Ace."),
                String(localized: "Costs half your original bet."),
                String(localized: "Pays 2:1 if dealer has Blackjack."),
                String(localized: "Generally not recommended by basic strategy.")
            ]
        ),
        RulePage(
            title: String(localized: "Dealer Rules"),
            icon: "person.fill",
            content: [
                String(localized: "Dealer must hit on 16 or less."),
                String(localized: "Dealer must stand on 17 or more (varies by rules)."),
                String(localized: "Some games: Dealer hits on 'soft 17' (Ace + 6).")
            ]
        ),
        RulePage(
            title: String(localized: "Payouts"),
            icon: "dollarsign.circle.fill",
            content: [
                String(localized: "Win: 1:1 (even money)"),
                String(localized: "Blackjack: 3:2"),
                String(localized: "Insurance: 2:1"),
                String(localized: "Push: Bet returned"),
                String(localized: "Surrender: Half bet returned")
            ]
        )
    ]
    
    var body: some View {
        NavigationStack {
            ZStack {
                Color.Settings.background
                    .ignoresSafeArea()
                
                VStack(spacing: 0) {
                    // Page content
                    TabView(selection: $currentPage) {
                        ForEach(pages.indices, id: \.self) { index in
                            RulePageView(page: pages[index])
                                .tag(index)
                        }
                    }
                    .tabViewStyle(.page(indexDisplayMode: .never))
                    
                    // Page indicator
                    HStack(spacing: Design.Spacing.small) {
                        ForEach(pages.indices, id: \.self) { index in
                            Circle()
                                .fill(index == currentPage ? Color.Settings.accent : Color.white.opacity(Design.Opacity.light))
                                .frame(width: 8, height: 8)
                        }
                    }
                    .padding(.vertical, Design.Spacing.medium)
                }
            }
            .navigationTitle(String(localized: "How to Play"))
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .topBarTrailing) {
                    Button(String(localized: "Done")) {
                        dismiss()
                    }
                    .foregroundStyle(Color.Settings.accent)
                }
            }
            .toolbarBackground(Color.Settings.background, for: .navigationBar)
            .toolbarColorScheme(.dark, for: .navigationBar)
        }
    }
}

// MARK: - Rule Page Model

struct RulePage: Identifiable {
    let id = UUID()
    let title: String
    let icon: String
    let content: [String]
}

// MARK: - Rule Page View

struct RulePageView: View {
    let page: RulePage
    
    @ScaledMetric(relativeTo: .title) private var iconSize: CGFloat = Design.BaseFontSize.display
    @ScaledMetric(relativeTo: .title) private var titleSize: CGFloat = Design.BaseFontSize.title
    @ScaledMetric(relativeTo: .body) private var bodySize: CGFloat = Design.BaseFontSize.body
    
    var body: some View {
        ScrollView {
            VStack(spacing: Design.Spacing.xLarge) {
                // Icon
                Image(systemName: page.icon)
                    .font(.system(size: iconSize))
                    .foregroundStyle(Color.Settings.accent)
                    .padding(.top, Design.Spacing.xxLarge)
                
                // Title
                Text(page.title)
                    .font(.system(size: titleSize, weight: .bold))
                    .foregroundStyle(.white)
                
                // Content
                VStack(alignment: .leading, spacing: Design.Spacing.medium) {
                    ForEach(page.content.indices, id: \.self) { index in
                        HStack(alignment: .top, spacing: Design.Spacing.medium) {
                            Text("•")
                                .foregroundStyle(Color.Settings.accent)
                            
                            Text(page.content[index])
                                .font(.system(size: bodySize))
                                .foregroundStyle(.white.opacity(Design.Opacity.heavy))
                        }
                    }
                }
                .padding(.horizontal, Design.Spacing.xxLarge)
                
                Spacer()
            }
        }
    }
}

#Preview {
    RulesHelpView()
}