//
//  SessionRecord.swift
//  Keging
//
//  완주한 세트 기록 — 중단한 세트는 저장하지 않는다 (CLAUDE.md §3.1)
//

import Foundation
import Combine

nonisolated struct SessionRecord: Codable, Identifiable, Equatable {
    var id: UUID = UUID()
    var startedAt: Date
    var reps: Int
    var contractSeconds: Int
    var relaxSeconds: Int
}

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

    @Published private(set) var records: [SessionRecord] = []

    private var fileURL: URL { AppGroup.containerURL.appendingPathComponent("records.json") }

    private init() { load() }

    func load() {
        guard let data = try? Data(contentsOf: fileURL),
              let saved = try? JSONDecoder().decode([SessionRecord].self, from: data) else { return }
        records = saved.sorted { $0.startedAt < $1.startedAt }
    }

    /// 중복(id) 병합 안전 — 워치에서 넘어온 기록도 이 경로로 합류
    func append(_ record: SessionRecord) {
        guard !records.contains(where: { $0.id == record.id }) else { return }
        records.append(record)
        records.sort { $0.startedAt < $1.startedAt }
        save()
    }

    private func save() {
        if let data = try? JSONEncoder().encode(records) {
            try? data.write(to: fileURL, options: .atomic)
        }
    }

    #if DEBUG
    /// 검증 시드 전용 — 전체 교체
    func _replaceAll(_ newRecords: [SessionRecord]) {
        records = newRecords.sorted { $0.startedAt < $1.startedAt }
        save()
    }
    #endif
}