//
//  WorkoutSettings.swift
//  Keging
//
//  세트 구성(수축·이완·횟수)과 진동 패턴 — 폰에서 설정, 워치로 동기화
//

import Foundation
import Combine

/// 진동 패턴 — 수축/이완 각각 선택. 진동 횟수·리듬으로 구분한다
nonisolated enum HapticPattern: String, CaseIterable, Identifiable, Codable {
    case once, twice, thrice, heartbeat

    var id: String { rawValue }

    var label: String {
        switch self {
        case .once: String(localized: "한 번")
        case .twice: String(localized: "두 번")
        case .thrice: String(localized: "세 번")
        case .heartbeat: String(localized: "심장 박동")
        }
    }

    /// 각 진동이 울리는 시점(초) — 첫 진동은 0
    var beatOffsets: [TimeInterval] {
        switch self {
        case .once: [0]
        case .twice: [0, 0.45]
        case .thrice: [0, 0.45, 0.9]
        case .heartbeat: [0, 0.3, 1.0, 1.3]
        }
    }
}

/// 세트 구성 — 세트 = (수축 → 이완) × 횟수
nonisolated struct WorkoutConfig: Codable, Equatable {
    var contractSeconds: Int = 10
    var relaxSeconds: Int = 5
    var reps: Int = 20
    var contractPattern: HapticPattern = .twice
    var relaxPattern: HapticPattern = .once
    /// 완주 시 애플 건강에 함께 기록할 운동 강도 (0 = 기록 안 함, 1~10)
    var effortScore: Int = 2

    init(
        contractSeconds: Int = 10,
        relaxSeconds: Int = 5,
        reps: Int = 20,
        contractPattern: HapticPattern = .twice,
        relaxPattern: HapticPattern = .once,
        effortScore: Int = 2
    ) {
        self.contractSeconds = contractSeconds
        self.relaxSeconds = relaxSeconds
        self.reps = reps
        self.contractPattern = contractPattern
        self.relaxPattern = relaxPattern
        self.effortScore = effortScore
    }

    // 필드 추가에도 기존 저장 JSON이 깨지지 않게 전 필드 decodeIfPresent
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        contractSeconds = try container.decodeIfPresent(Int.self, forKey: .contractSeconds) ?? 10
        relaxSeconds = try container.decodeIfPresent(Int.self, forKey: .relaxSeconds) ?? 5
        reps = try container.decodeIfPresent(Int.self, forKey: .reps) ?? 20
        contractPattern = try container.decodeIfPresent(HapticPattern.self, forKey: .contractPattern) ?? .twice
        relaxPattern = try container.decodeIfPresent(HapticPattern.self, forKey: .relaxPattern) ?? .once
        effortScore = try container.decodeIfPresent(Int.self, forKey: .effortScore) ?? 2
    }

    var totalDuration: TimeInterval { Double(reps * (contractSeconds + relaxSeconds)) }

    var summaryText: String {
        String(localized: "수축 \(contractSeconds)초 · 이완 \(relaxSeconds)초 · \(reps)회")
    }
}

@MainActor
final class SettingsStore: ObservableObject {
    static let shared = SettingsStore()

    @Published var config: WorkoutConfig {
        didSet {
            save()
            if config != oldValue { onConfigChange?(config) }
        }
    }

    /// 폰 → 워치 동기화 훅 (iOS에서만 연결)
    var onConfigChange: ((WorkoutConfig) -> Void)?

    private static let key = "workout.config.v1"

    private init() {
        if let data = AppGroup.defaults.data(forKey: Self.key),
           let saved = try? JSONDecoder().decode(WorkoutConfig.self, from: data) {
            config = saved
        } else {
            config = WorkoutConfig()
        }
    }

    private func save() {
        if let data = try? JSONEncoder().encode(config) {
            AppGroup.defaults.set(data, forKey: Self.key)
        }
    }
}