// ── Siri Shortcuts (App Intents) ──────────────────────────────
// "Set a timer for 25 minutes", "Start Pomodoro", etc.
// iOS 17+ App Intents framework

import AppIntents
import Foundation

// MARK: - Set Timer Intent

struct SetTimerIntent: AppIntent {
    static var title: LocalizedStringResource = "Set a Timer"
    static var description: IntentDescription = "Creates a countdown timer for the specified duration"
    static var openAppWhenRun: Bool = false

    @Parameter(title: "Duration (minutes)", default: 25)
    var minutes: Int

    @Parameter(title: "Label", default: "Timer")
    var label: String

    static var parameterSummary: some ParameterSummary {
        Summary("Set a \(\.$minutes) minute timer called \(\.$label)")
    }

    func perform() async throws -> some IntentResult & ProvidesDialog {
        let now = Date()
        let targetTime = now.addingTimeInterval(TimeInterval(minutes * 60))
        let intervals = CascadePreset.minimal.defaultIntervals

        let snapshot = TimerSnapshot(
            id: UUID().uuidString,
            label: label,
            type: .countdown,
            urgency: .standard,
            state: .active,
            targetTime: targetTime,
            duration: TimeInterval(minutes * 60),
            startedAt: now,
            elapsedBeforePause: 0,
            snoozeCount: 0,
            category: nil,
            pomodoroCurrentRound: nil,
            pomodoroTotalRounds: nil,
            pomodoroIsBreak: nil,
            nextWarningTime: intervals.first.map { targetTime.addingTimeInterval(-Double($0) * 60) },
            totalWarnings: intervals.count,
            firedWarnings: 0
        )

        // Write to shared data
        let manager = SharedTimerDataManager.shared
        var timers = manager.readSnapshots()
        timers.append(snapshot)
        manager.writeSnapshots(timers)
        manager.writeActiveTimer(nil) // Let iOS app recalculate

        return .result(dialog: "Timer set for \(minutes) minutes: \(label)")
    }
}

// MARK: - Start Pomodoro Intent

struct StartPomodoroIntent: AppIntent {
    static var title: LocalizedStringResource = "Start Pomodoro"
    static var description: IntentDescription = "Starts a 25-minute Pomodoro focus session"
    static var openAppWhenRun: Bool = true

    @Parameter(title: "Work Minutes", default: 25)
    var workMinutes: Int

    static var parameterSummary: some ParameterSummary {
        Summary("Start a \(\.$workMinutes) minute Pomodoro session")
    }

    func perform() async throws -> some IntentResult & ProvidesDialog {
        let now = Date()
        let durationSeconds = TimeInterval(workMinutes * 60)
        let targetTime = now.addingTimeInterval(durationSeconds)

        let snapshot = TimerSnapshot(
            id: UUID().uuidString,
            label: "Pomodoro Focus",
            type: .pomodoro,
            urgency: .standard,
            state: .active,
            targetTime: targetTime,
            duration: durationSeconds,
            startedAt: now,
            elapsedBeforePause: 0,
            snoozeCount: 0,
            category: nil,
            pomodoroCurrentRound: 1,
            pomodoroTotalRounds: 4,
            pomodoroIsBreak: false,
            nextWarningTime: targetTime.addingTimeInterval(-60),
            totalWarnings: 1,
            firedWarnings: 0
        )

        let manager = SharedTimerDataManager.shared
        var timers = manager.readSnapshots()
        timers.append(snapshot)
        manager.writeSnapshots(timers)

        return .result(dialog: "Pomodoro started: \(workMinutes) minutes of focus time!")
    }
}

// MARK: - What's My Next Timer Intent

struct NextTimerInfoIntent: AppIntent {
    static var title: LocalizedStringResource = "What's My Next Timer?"
    static var description: IntentDescription = "Tells you about your next upcoming timer"
    static var openAppWhenRun: Bool = false

    func perform() async throws -> some IntentResult & ProvidesDialog {
        let manager = SharedTimerDataManager.shared
        guard let next = manager.readNextFiringTimer() else {
            return .result(dialog: "You don't have any active timers right now.")
        }

        let remaining = next.remainingSeconds()
        let compact = formatDurationCompact(remaining)
        let timeStr = formatTime(next.targetTime)

        return .result(dialog: "\(next.label) fires in \(compact), at \(timeStr).")
    }
}

// MARK: - Shortcuts Provider

struct ChronoMindShortcutsProvider: AppShortcutsProvider {
    static var appShortcuts: [AppShortcut] {
        AppShortcut(
            intent: SetTimerIntent(),
            phrases: [
                "Set a timer in \(.applicationName)",
                "Set a \(\.$minutes) minute timer in \(.applicationName)",
                "Start a \(\.$minutes) minute timer called \(\.$label) in \(.applicationName)",
            ],
            shortTitle: "Set Timer",
            systemImageName: "timer"
        )

        AppShortcut(
            intent: StartPomodoroIntent(),
            phrases: [
                "Start Pomodoro in \(.applicationName)",
                "Start a focus session in \(.applicationName)",
                "Start a \(\.$workMinutes) minute Pomodoro in \(.applicationName)",
            ],
            shortTitle: "Start Pomodoro",
            systemImageName: "target"
        )

        AppShortcut(
            intent: NextTimerInfoIntent(),
            phrases: [
                "What's my next timer in \(.applicationName)",
                "When's my next alarm in \(.applicationName)",
                "Next timer in \(.applicationName)",
            ],
            shortTitle: "Next Timer",
            systemImageName: "clock"
        )
    }
}