/**
 * DailyNotificationPowerManager.swift
 * Daily Notification Plugin for Capacitor
 *
 * Manages power state and battery optimization for notifications
 */

import Foundation
import UIKit
import UserNotifications

/// Manages power state and battery optimization for the notification plugin
public class DailyNotificationPowerManager {
    /// Shared instance for singleton access
    public static let shared = DailyNotificationPowerManager()
    
    private var batteryLevel: Float = 1.0
    private var isCharging = false
    private var lastBatteryCheck: Date = Date()
    private var powerState: UIDevice.BatteryState = .unknown
    private var adaptiveSchedulingEnabled = true
    
    private init() {
        setupBatteryMonitoring()
    }
    
    private func setupBatteryMonitoring() {
        UIDevice.current.isBatteryMonitoringEnabled = true
        updateBatteryStatus()
        
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(batteryLevelDidChange),
            name: UIDevice.batteryLevelDidChangeNotification,
            object: nil
        )
        
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(batteryStateDidChange),
            name: UIDevice.batteryStateDidChangeNotification,
            object: nil
        )
    }
    
    @objc private func batteryLevelDidChange() {
        updateBatteryStatus()
    }
    
    @objc private func batteryStateDidChange() {
        updateBatteryStatus()
    }
    
    private func updateBatteryStatus() {
        batteryLevel = UIDevice.current.batteryLevel
        isCharging = UIDevice.current.batteryState == .charging
        powerState = UIDevice.current.batteryState
        lastBatteryCheck = Date()
        
        DailyNotificationLogger.shared.log(
            .debug,
            "Battery status updated: \(Int(batteryLevel * 100))% (\(isCharging ? "charging" : "not charging"))"
        )
    }
    
    /// Gets the current battery status
    /// - Returns: Dictionary containing battery information
    public func getBatteryStatus() -> [String: Any] {
        return [
            "level": Int(batteryLevel * 100),
            "isCharging": isCharging,
            "lastCheck": lastBatteryCheck.timeIntervalSince1970,
            "powerState": getPowerStateString()
        ]
    }
    
    /// Gets the current power state
    /// - Returns: Dictionary containing power state information
    public func getPowerState() -> [String: Any] {
        return [
            "powerState": getPowerStateString(),
            "adaptiveScheduling": adaptiveSchedulingEnabled,
            "batteryLevel": Int(batteryLevel * 100),
            "isCharging": isCharging,
            "lastCheck": lastBatteryCheck.timeIntervalSince1970
        ]
    }
    
    /// Sets whether adaptive scheduling is enabled
    /// - Parameter enabled: Whether to enable adaptive scheduling
    public func setAdaptiveScheduling(_ enabled: Bool) {
        adaptiveSchedulingEnabled = enabled
        DailyNotificationLogger.shared.log(
            .info,
            "Adaptive scheduling \(enabled ? "enabled" : "disabled")"
        )
    }
    
    /// Gets the appropriate scheduling interval based on battery level
    /// - Returns: TimeInterval for scheduling
    public func getSchedulingInterval() -> TimeInterval {
        guard adaptiveSchedulingEnabled else {
            return DailyNotificationConfig.SchedulingIntervals.normal
        }
        
        let batteryPercentage = Int(batteryLevel * 100)
        
        switch batteryPercentage {
        case ..<DailyNotificationConfig.BatteryThresholds.critical:
            return DailyNotificationConfig.SchedulingIntervals.critical
        case ..<DailyNotificationConfig.BatteryThresholds.low:
            return DailyNotificationConfig.SchedulingIntervals.low
        case ..<DailyNotificationConfig.BatteryThresholds.medium:
            return DailyNotificationConfig.SchedulingIntervals.medium
        default:
            return DailyNotificationConfig.SchedulingIntervals.normal
        }
    }
    
    /// Gets the appropriate wake lock duration based on battery level
    /// - Returns: TimeInterval for wake lock
    public func getWakeLockDuration() -> TimeInterval {
        let batteryPercentage = Int(batteryLevel * 100)
        
        switch batteryPercentage {
        case ..<DailyNotificationConfig.BatteryThresholds.critical:
            return DailyNotificationConfig.WakeLockDurations.critical
        case ..<DailyNotificationConfig.BatteryThresholds.low:
            return DailyNotificationConfig.WakeLockDurations.low
        default:
            return DailyNotificationConfig.WakeLockDurations.normal
        }
    }
    
    private func getPowerStateString() -> String {
        switch powerState {
        case .charging:
            return "CHARGING"
        case .full:
            return "FULL"
        case .unplugged:
            return "UNPLUGGED"
        case .unknown:
            return "UNKNOWN"
        @unknown default:
            return "UNKNOWN"
        }
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
}