//
//  ReadingPlanState.swift
//  Bible-Week
//
//  Estado persistente do Plano Bíblia em 180 Dias: progresso de leitura
//  e preferências do lembrete diário.
//

import Foundation
import SwiftData

@Model
final class ReadingPlanState {
    var startedAt: Date
    var isPaused: Bool

    /// Chaves "dia-trilha" das leituras concluídas, ex.: "34-nt".
    var completedKeys: [String]

    // Preferências do lembrete diário. Sobrevivem a pausa e reinício do plano.
    var reminderEnabled: Bool
    var reminderHour: Int
    var reminderMinute: Int
    var reminderSoundEnabled: Bool
    var hasSeenReminderPrompt: Bool

    init(startedAt: Date = .now) {
        self.startedAt = startedAt
        self.isPaused = false
        self.completedKeys = []
        self.reminderEnabled = false
        self.reminderHour = 20
        self.reminderMinute = 0
        self.reminderSoundEnabled = true
        self.hasSeenReminderPrompt = false
    }

    // MARK: - Progresso

    private static func key(day: Int, track: PlanTrack) -> String {
        "\(day)-\(track.rawValue)"
    }

    func isCompleted(day: Int, track: PlanTrack) -> Bool {
        completedKeys.contains(Self.key(day: day, track: track))
    }

    func setCompleted(_ completed: Bool, day: Int, track: PlanTrack) {
        let key = Self.key(day: day, track: track)
        if completed {
            if !completedKeys.contains(key) { completedKeys.append(key) }
        } else {
            completedKeys.removeAll { $0 == key }
        }
    }

    func isDayCompleted(_ day: Int) -> Bool {
        PlanTrack.allCases.allSatisfy { isCompleted(day: day, track: $0) }
    }

    /// Primeiro dia com leitura pendente (1...180). Se tudo concluído, 180.
    var currentDay: Int {
        (1...PlanSchedule.totalDays).first { !isDayCompleted($0) } ?? PlanSchedule.totalDays
    }

    var completedDaysCount: Int {
        (1...PlanSchedule.totalDays).count { isDayCompleted($0) }
    }

    var isCompleted: Bool {
        completedDaysCount == PlanSchedule.totalDays
    }

    /// Fração concluída do plano (0...1).
    var progress: Double {
        Double(completedDaysCount) / Double(PlanSchedule.totalDays)
    }

    // MARK: - Lembrete

    /// Horário do lembrete formatado, ex.: "20:00".
    var reminderTimeText: String {
        String(format: "%02d:%02d", reminderHour, reminderMinute)
    }

    // MARK: - Ciclo de vida do plano

    /// Recomeça o plano do dia 1, preservando as preferências de lembrete.
    func restart() {
        completedKeys = []
        startedAt = .now
        isPaused = false
    }
}