//
//  LiveActivityManager.swift
//  Haru_Danim
//
//  추적 상태를 다이나믹 아일랜드/잠금화면 Live Activity에 반영 (CLAUDE.md §4.1, §4.2)
//

import Foundation
import ActivityKit
import SwiftData

enum LiveActivityManager {
    /// 현재 진행 중인 세션들을 읽어 Live Activity를 시작/갱신/종료한다.
    /// 세션 시작·종료·수정 후마다 호출.
    static func sync(context: ModelContext) {
        guard ActivityAuthorizationInfo().areActivitiesEnabled else { return }

        let descriptor = FetchDescriptor<TimeSession>(
            predicate: #Predicate { $0.endAt == nil },
            sortBy: [SortDescriptor(\.startAt, order: .forward)]
        )
        let running = (try? context.fetch(descriptor)) ?? []

        let mode = LiveActivityMode(
            rawValue: UserDefaults.standard.string(forKey: SettingsKeys.liveActivityMode) ?? ""
        ) ?? .latest
        let representative = mode == .earliest ? running.first : running.last

        guard let representative, let action = representative.action else {
            endAll()
            return
        }

        let state = TrackingActivityAttributes.ContentState(
            actionName: action.name,
            symbolName: action.symbolName,
            colorHex: action.sortedTags.first?.colorHex ?? "#2F6B4F",
            startedAt: representative.startAt,
            extraCount: max(running.count - 1, 0)
        )
        let content = ActivityContent(state: state, staleDate: nil)

        Task {
            let activities = Activity<TrackingActivityAttributes>.activities
            if let activity = activities.first {
                await activity.update(content)
                // 혹시 중복 생성된 것이 있으면 정리
                for extra in activities.dropFirst() {
                    await extra.end(nil, dismissalPolicy: .immediate)
                }
            } else {
                _ = try? Activity<TrackingActivityAttributes>.request(
                    attributes: TrackingActivityAttributes(),
                    content: content
                )
            }
        }
    }

    static func endAll() {
        Task {
            for activity in Activity<TrackingActivityAttributes>.activities {
                await activity.end(nil, dismissalPolicy: .immediate)
            }
        }
    }
}