//
//  WordPuzzleViewB.swift
//  AIGrammar
//
//  Created by oscar on 2025/7/16.
//

import AVFoundation

var soundID: SystemSoundID = 1104 // 系统键盘点击声

func playKeyClickSound() {
    AudioServicesPlaySystemSound(soundID)
}

import SwiftUI

struct WordPuzzleView: View {
    @StateObject private var viewModel = WordPuzzleViewModel()

    var body: some View {
        ZStack {
            Color.pink.opacity(0.2).edgesIgnoringSafeArea(.all)

            VStack(spacing: 16) {
                // Top: score & timer
                Text("Find the Word!")
                    .font(.largeTitle)
                    .bold()
                    .padding(.bottom, 30)
                
                HStack {
                    Text("Wins: \(viewModel.dailyWins)")
                        .font(.headline)
                    Spacer()
                    Text("Words: \(viewModel.guessedWords)/4")
                        .font(.headline)
                    Spacer()
                    Text("Time: \(viewModel.timeRemaining)s")
                        .font(.headline)
                }
                .padding(.horizontal, 30)
                .padding(.bottom, 20)

                // Grid
                GridView(letters: viewModel.letters, selectedPositions: $viewModel.selectedPositions)

                Spacer()
                // Toast
                toastView
                    .frame(height: 50)
                    .frame(maxWidth: .infinity)
                    //.background(viewModel.showToast ? viewModel.toastColor : Color.pink.opacity(0.0))
                    .cornerRadius(8)
                    .padding(.bottom, 10)
                
                HStack {
                    Button("Shuffle") {
                        viewModel.shuffle()
                    }
                    .padding()
                    .background(Color.orange.opacity(0.7))
                    .foregroundColor(.white)
                    .cornerRadius(10)
                    .font(.subheadline) // 调整字体大小为标题大小
                    
                    Spacer()
                    
                    Button("Submit") {
                        viewModel.submit()
                    }
                    .padding()
                    .background(Color.green.opacity(0.7))
                    .foregroundColor(.white)
                    .cornerRadius(10)
                    .font(.subheadline) // 调整字体大小为标题大小
                }
                .padding(.horizontal)
                .padding(.bottom, 20)
                
            }
            .padding()
            .onAppear {
                viewModel.startTimer()
            }
            .onDisappear {
                viewModel.stopTimer()
            }
        }
    }

    var toastView: some View {
        HStack {
            if viewModel.showToast {
                if viewModel.toastFlag {
                    Image(systemName: "checkmark.circle.fill")
                        .foregroundColor(.green)
                } else {
                    Image(systemName: "xmark.octagon.fill")
                        .foregroundColor(.red)
                }
                Text(viewModel.toastMessage)
                    .font(.body)
            }
        }
        .opacity(viewModel.showToast ? 1 : 0)
        .animation(.easeInOut, value: viewModel.showToast)
    }
}

// MARK: - GridView
struct GridView: View {
    let letters: [[String]]
    @Binding var selectedPositions: [(row: Int, col: Int)]

    var body: some View {
        GeometryReader { geo in
            let size = geo.size.width * 0.8
            VStack(spacing: 2) {
                ForEach(0..<letters.count, id: \.self) { row in
                    HStack(spacing: 2) {
                        ForEach(0..<letters[row].count, id: \.self) { col in
                            let selected = selectedPositions.contains { $0.row == row && $0.col == col }
                            Text(letters[row][col])
                                .frame(width: size / CGFloat(letters.count),
                                       height: size / CGFloat(letters.count))
                                .background(
                                    ZStack {
                                        if selected {
                                            RoundedRectangle(cornerRadius: 6)
                                                .fill(Color.blue.opacity(0.7))
                                        } else {
                                            RoundedRectangle(cornerRadius: 6)
                                                .fill(Color.white)
                                                .shadow(color: .gray.opacity(0.3), radius: 2, x: 0, y: 2)
                                            RoundedRectangle(cornerRadius: 6)
                                                .stroke(Color.gray.opacity(0.3), lineWidth: 0.5)
                                        }
                                    }
                                )
                                .foregroundColor(selected ? .white : .black)
                                .onTapGesture {
                                    toggleSelection(row: row, col: col)
                                    playKeyClickSound()
                                }
                        }
                    }
                }
            }
            .frame(width: size, height: size)
            .padding()
            .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .center)
        }
        .frame(height: 300) // 给个固定高度
    }

    private func toggleSelection(row: Int, col: Int) {
        if let index = selectedPositions.firstIndex(where: { $0.row == row && $0.col == col }) {
            selectedPositions.remove(at: index)
        } else {
            selectedPositions.append((row, col))
        }
    }
}

// MARK: - ViewModel
class WordPuzzleViewModel: ObservableObject {
    @Published var letters: [[String]] = []
    @Published var selectedPositions: [(row: Int, col: Int)] = []
    @Published var guessedWords: Int = 0
    @Published var dailyWins: Int = 0
    @Published var timeRemaining: Int = 60
    @Published var shuffleCount: Int = 0

    @Published var showToast = false
    @Published var toastFlag = false
    @Published var toastMessage = ""

    private var timer: Timer?
    private var allWords: Set<String> = []
    private var submittedWords: Set<String> = []
    private let generator = PuzzleGenerator()

    init() {
        generateNewPuzzle()
    }

    /// 生成新题
    func generateNewPuzzle() {
        let (words, grid) = generator.generatePuzzle()
        allWords = words
        letters = grid

        guessedWords = 0
        selectedPositions.removeAll()
        timeRemaining = 60
        //shuffleCount = 0
        
        submittedWords.removeAll()
        logger.info("New puzzle with words: \(allWords)")
    }

    func startTimer() {
        stopTimer()
        timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { _ in
            if self.timeRemaining > 0 {
                self.timeRemaining -= 1
            } else {
                self.stopTimer()
            }
        }
    }

    func stopTimer() {
        timer?.invalidate()
        timer = nil
    }

    func submit() {
        let word = selectedWord().uppercased()
        selectedPositions.removeAll()

        guard !word.isEmpty else { return }

        if timeRemaining <= 0 {
            showToast(message: "Time's up!  Shuffle for new game.", succ: false)
            return
        }

        if word.count < 3 {
            showToast(message: "At least three words.", succ: false)
            return
        }
        
        if submittedWords.contains(word) {
            showToast(message: "Already submitted!", succ: false)
            return
        }
        
        if generator.validate(word: word) {
            guessedWords += 1
            submittedWords.insert(word) // 记录
            showToast(message: "Correct!", succ: true)
        } else {
            showToast(message: "Please try again", succ: false)
        }

        if guessedWords >= 4 {
            dailyWins += 1
            showToast(message: "Congratulations! Next puzzle...", succ: true)
            generateNewPuzzle()
        }
    }

    func shuffle() {
        if shuffleCount >= 10 {
            showToast(message: "No more shuffles today", succ: false)
            return
        }

        shuffleCount += 1
        generateNewPuzzle()
        startTimer()
    }

    private func selectedWord() -> String {
        selectedPositions.map { letters[$0.row][$0.col] }.joined()
    }

    private func showToast(message: String, succ: Bool) {
        toastMessage = message
        toastFlag = succ
        showToast = true
        DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
            self.showToast = false
        }
    }
}

struct WordPuzzleView_Previews: PreviewProvider {
    static var previews: some View {
        WordPuzzleView()
    }
}

#Preview {
    WordPuzzleView()
}