import Foundation
import UIKit
import CoreLocation
import Contacts
import EventKit

/// 系统功能处理器
class SystemFunctionHandler {
    private let TAG = "SystemFunctionHandler"
    private let context: Any
    static let ACTION_EXIT_INTERACTION = "com.yunqiinnovation.deepsound.action.EXIT_INTERACTION"
    
    /// 初始化系统功能处理器
    /// - Parameter context: 应用上下文
    init(context: Any) {
        self.context = context
    }
    
    /// 注册所有系统功能
    /// - Parameter client: MCP客户端
    func registerAllFunctions(client: MCPClient) {
        // 注册退出交互函数
        registerExitInteractionFunction(client)
        
        // 注册翻译模式函数
        registerTranslationModeFunction(client)
        
        // 注册发送短信函数
        registerSendTextMessageFunction(client)
        
        // 注册拨打电话函数
        registerMakePhoneCallFunction(client)
        
        // 注册打开应用函数
        registerOpenAppFunction(client)
        
        // 注册设置提醒函数
        registerSetReminderFunction(client)
        
        // 注册获取当前时间函数
        registerGetCurrentTimeFunction(client)
        
        // 注册获取当前位置函数
        registerGetCurrentLocationFunction(client)
        
        print("\(TAG) 所有系统功能注册完成")
    }
    
    /// 注册退出交互函数
    private func registerExitInteractionFunction(_ client: MCPClient) {
        // 定义函数参数
        let parameters: [String: Any] = [
            "type": "object",
            "properties": [:],
            "required": []
        ]
        
        // 创建函数处理器
        let handler = ExitInteractionHandler()
        
        // 注册函数
        client.registerLocalFunction(
            name: "exit_interaction",
            description: "结束当前交互",
            parameters: parameters,
            handler: handler
        )
        print("\(TAG) 已注册退出交互功能")
    }
    
    /// 注册翻译模式函数
    private func registerTranslationModeFunction(_ client: MCPClient) {
        // 定义函数参数
        let parameters: [String: Any] = [
            "type": "object",
            "properties": [:],
            "required": []
        ]
        
        // 创建函数处理器
        let handler = TranslationModeHandler()
        
        // 注册函数
        client.registerLocalFunction(
            name: "enter_translation_mode",
            description: "用户请求进入实时翻译模式时，启动实时翻译功能",
            parameters: parameters,
            handler: handler
        )
        print("\(TAG) 已注册翻译模式功能")
    }
    
    /// 注册发送短信函数
    private func registerSendTextMessageFunction(_ client: MCPClient) {
        // 定义函数参数
        let parameters: [String: Any] = [
            "type": "object",
            "properties": [
                "contact": [
                    "type": "string",
                    "description": "联系人姓名或电话号码"
                ],
                "message": [
                    "type": "string",
                    "description": "短信内容"
                ]
            ],
            "required": ["contact", "message"]
        ]
        
        // 创建函数处理器
        let handler = SendTextMessageHandler()
        
        // 注册函数
        client.registerLocalFunction(
            name: "send_text_message",
            description: "发送短信",
            parameters: parameters,
            handler: handler
        )
        print("\(TAG) 已注册发送短信功能")
    }
    
    /// 注册拨打电话函数
    private func registerMakePhoneCallFunction(_ client: MCPClient) {
        // 定义函数参数
        let parameters: [String: Any] = [
            "type": "object",
            "properties": [
                "contact": [
                    "type": "string",
                    "description": "联系人姓名或电话号码"
                ]
            ],
            "required": ["contact"]
        ]
        
        // 创建函数处理器
        let handler = MakePhoneCallHandler()
        
        // 注册函数
        client.registerLocalFunction(
            name: "make_phone_call",
            description: "拨打电话",
            parameters: parameters,
            handler: handler
        )
        print("\(TAG) 已注册拨打电话功能")
    }
    
    /// 注册打开应用函数
    private func registerOpenAppFunction(_ client: MCPClient) {
        // 定义函数参数
        let parameters: [String: Any] = [
            "type": "object",
            "properties": [
                "app_name": [
                    "type": "string",
                    "description": "应用名称"
                ]
            ],
            "required": ["app_name"]
        ]
        
        // 创建函数处理器
        let handler = OpenAppHandler()
        
        // 注册函数
        client.registerLocalFunction(
            name: "open_app",
            description: "当用户请求打开特定应用时，启动相应应用",
            parameters: parameters,
            handler: handler
        )
        print("\(TAG) 已注册打开应用功能")
    }
    
    /// 注册设置提醒函数
    private func registerSetReminderFunction(_ client: MCPClient) {
        // 定义函数参数
        let parameters: [String: Any] = [
            "type": "object",
            "properties": [
                "title": [
                    "type": "string",
                    "description": "提醒标题"
                ],
                "content": [
                    "type": "string",
                    "description": "提醒内容"
                ],
                "time": [
                    "type": "string",
                    "description": "提醒时间，格式为'yyyy-MM-dd HH:mm'，如'2023-12-31 14:30'"
                ]
            ],
            "required": ["title", "time"]
        ]
        
        // 创建函数处理器
        let handler = SetReminderHandler()
        
        // 注册函数
        client.registerLocalFunction(
            name: "set_reminder",
            description: "设置提醒事项",
            parameters: parameters,
            handler: handler
        )
        print("\(TAG) 已注册设置提醒功能")
    }
    
    /// 注册获取当前时间函数
    private func registerGetCurrentTimeFunction(_ client: MCPClient) {
        // 定义函数参数
        let parameters: [String: Any] = [
            "type": "object",
            "properties": [
                "format": [
                    "type": "string",
                    "description": "时间格式，可选，默认为标准格式"
                ]
            ],
            "required": []
        ]
        
        // 创建函数处理器
        let handler = GetCurrentTimeHandler()
        
        // 注册函数
        client.registerLocalFunction(
            name: "get_current_time",
            description: "获取当前日期和时间",
            parameters: parameters,
            handler: handler
        )
        print("\(TAG) 已注册获取当前时间功能")
    }
    
    /// 注册获取当前位置函数
    private func registerGetCurrentLocationFunction(_ client: MCPClient) {
        // 定义函数参数
        let parameters: [String: Any] = [
            "type": "object",
            "properties": [:],
            "required": []
        ]
        
        // 创建函数处理器
        let handler = GetCurrentLocationHandler()
        
        // 注册函数
        client.registerLocalFunction(
            name: "get_current_location",
            description: "获取当前地理位置",
            parameters: parameters,
            handler: handler
        )
        print("\(TAG) 已注册获取当前位置功能")
    }
}

/// 退出交互处理器
class ExitInteractionHandler: FunctionHandler {
    func handle(arguments: [String: Any]) async throws -> String {
        // 发送通知和广播
        NotificationCenter.default.post(
            name: Notification.Name(SystemFunctionHandler.ACTION_EXIT_INTERACTION),
            object: nil,
            userInfo: ["timestamp": Date().timeIntervalSince1970]
        )
        
        return "{\"result\": \"已结束当前交互\"}"
    }
}

/// 翻译模式处理器
class TranslationModeHandler: FunctionHandler {
    func handle(arguments: [String: Any]) async throws -> String {
        // 发送通知
        NotificationCenter.default.post(
            name: Notification.Name("com.yunqiinnovation.deepsound.ACTION_ENTER_TRANSLATION_MODE"),
            object: nil,
            userInfo: ["timestamp": Date().timeIntervalSince1970]
        )
        
        return "{\"result\": \"已进入实时翻译模式\"}"
    }
}

/// 发送短信处理器
class SendTextMessageHandler: FunctionHandler {
    func handle(arguments: [String: Any]) async throws -> String {
        guard let contact = arguments["contact"] as? String,
              let message = arguments["message"] as? String else {
            return "{\"result\": \"发送短信失败：缺少联系人或消息内容\"}"
        }
        
        // iOS不允许应用直接发送短信，但可以打开短信应用
        if let url = URL(string: "sms:\(contact)&body=\(message.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? "")") {
            DispatchQueue.main.async {
                UIApplication.shared.open(url, options: [:], completionHandler: nil)
            }
            return "{\"result\": \"已打开短信应用，收件人：\(contact)\"}"
        }
        
        return "{\"result\": \"发送短信失败：无法打开短信应用\"}"
    }
}

/// 拨打电话处理器
class MakePhoneCallHandler: FunctionHandler {
    func handle(arguments: [String: Any]) async throws -> String {
        guard let contact = arguments["contact"] as? String else {
            return "{\"result\": \"拨打电话失败：缺少联系人\"}"
        }
        
        let phoneNumber = contact.replacingOccurrences(of: "[^+0-9]", with: "", options: .regularExpression)
        
        if let url = URL(string: "tel://\(phoneNumber)") {
            DispatchQueue.main.async {
                UIApplication.shared.open(url, options: [:], completionHandler: nil)
            }
            return "{\"result\": \"正在拨打\(contact)的电话\"}"
        }
        
        return "{\"result\": \"拨打电话失败：无法拨打电话\"}"
    }
}

/// 打开应用处理器
class OpenAppHandler: FunctionHandler {
    func handle(arguments: [String: Any]) async throws -> String {
        guard let appName = arguments["app_name"] as? String else {
            return "{\"result\": \"打开应用失败：缺少应用名称\"}"
        }
        
        // iOS没有直接打开其他应用的API，只能通过URL Scheme
        // 这里只是模拟返回成功，实际上无法在iOS上实现这个功能
        return "{\"result\": \"打开应用功能在iOS上受限，无法直接打开\(appName)\"}"
    }
}

/// 设置提醒处理器
class SetReminderHandler: FunctionHandler {
    func handle(arguments: [String: Any]) async throws -> String {
        guard let title = arguments["title"] as? String,
              let timeStr = arguments["time"] as? String else {
            return "{\"result\": \"设置提醒失败：缺少标题或时间\"}"
        }
        
        let content = arguments["content"] as? String ?? ""
        
        // 解析时间
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm"
        guard let date = dateFormatter.date(from: timeStr) else {
            return "{\"result\": \"设置提醒失败：时间格式无效，请使用'yyyy-MM-dd HH:mm'格式\"}"
        }
        
        // 使用EventKit添加提醒
        let eventStore = EKEventStore()
        let event = EKEvent(eventStore: eventStore)
        event.title = title
        event.notes = content
        event.startDate = date
        event.endDate = date.addingTimeInterval(3600) // 1小时后
        event.calendar = eventStore.defaultCalendarForNewEvents
        
        do {
            try eventStore.save(event, span: .thisEvent)
            return "{\"result\": \"已创建提醒: \(title), 时间: \(timeStr)\"}"
        } catch {
            return "{\"result\": \"设置提醒失败：\(error.localizedDescription)\"}"
        }
    }
}

/// 获取当前时间处理器
class GetCurrentTimeHandler: FunctionHandler {
    func handle(arguments: [String: Any]) async throws -> String {
        let format = arguments["format"] as? String
        
        let calendar = Calendar.current
        let date = Date()
        
        let dateFormatter = DateFormatter()
        dateFormatter.locale = Locale(identifier: "zh_CN")
        
        let timeStr: String
        switch format?.lowercased() {
        case "short":
            dateFormatter.dateFormat = "HH:mm"
            timeStr = dateFormatter.string(from: date)
        case "date":
            dateFormatter.dateFormat = "yyyy年MM月dd日"
            timeStr = dateFormatter.string(from: date)
        case "time":
            dateFormatter.dateFormat = "HH:mm:ss"
            timeStr = dateFormatter.string(from: date)
        case "full":
            dateFormatter.dateFormat = "yyyy年MM月dd日 EEEE HH:mm:ss"
            timeStr = dateFormatter.string(from: date)
        case "iso":
            dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
            timeStr = dateFormatter.string(from: date)
        default:
            dateFormatter.dateFormat = "yyyy年MM月dd日 HH:mm"
            timeStr = dateFormatter.string(from: date)
        }
        
        // 获取星期几
        let weekDay: String
        if format == "full" {
            weekDay = "" // 已经包含在dateFormatter里
        } else {
            let weekDayNum = calendar.component(.weekday, from: date)
            switch weekDayNum {
            case 1: weekDay = "星期日"
            case 2: weekDay = "星期一"
            case 3: weekDay = "星期二"
            case 4: weekDay = "星期三"
            case 5: weekDay = "星期四"
            case 6: weekDay = "星期五"
            case 7: weekDay = "星期六"
            default: weekDay = ""
            }
        }
        
        // 格式化结果
        let resultTime: String
        if format == "short" || format == "time" {
            resultTime = timeStr
        } else if format == "full" {
            resultTime = timeStr // already contains weekday
        } else {
            resultTime = "\(timeStr) \(weekDay)"
        }
        
        return "{\"result\": \"\(resultTime)\", \"time\": \"\(resultTime)\"}"
    }
}

/// 获取当前位置处理器
class GetCurrentLocationHandler: FunctionHandler {
    private let locationManager = CLLocationManager()
    private var locationCompletionHandler: ((String, Bool) -> Void)?
    
    func handle(arguments: [String: Any]) async throws -> String {
        return await withCheckedContinuation { continuation in
            self.getLocation { message, success in
                continuation.resume(returning: "{\"result\": \"\(message)\", \"success\": \(success)}")
            }
        }
    }
    
    private func getLocation(completion: @escaping (String, Bool) -> Void) {
        locationCompletionHandler = completion
        
        // 检查权限
        let authStatus = CLLocationManager.authorizationStatus()
        if authStatus == .denied || authStatus == .restricted {
            completion("需要位置权限才能获取当前位置", false)
            return
        }
        
        // 检查位置服务是否开启
        if !CLLocationManager.locationServicesEnabled() {
            completion("位置服务未启用，请打开GPS或网络定位", false)
            return
        }
        
        // 如果有最后的位置，使用它
        if let lastLocation = locationManager.location {
            let message = "当前位置: 经度 \(lastLocation.coordinate.longitude), 纬度 \(lastLocation.coordinate.latitude)"
            completion(message, true)
            return
        }
        
        // 否则请求更新
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()
        
        // 设置超时
        DispatchQueue.main.asyncAfter(deadline: .now() + 10) { [weak self] in
            if let handler = self?.locationCompletionHandler {
                self?.locationManager.stopUpdatingLocation()
                handler("获取位置超时，请稍后重试", false)
                self?.locationCompletionHandler = nil
            }
        }
    }
}

// 扩展以接收位置更新
extension GetCurrentLocationHandler: CLLocationManagerDelegate {
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        guard let location = locations.last, let handler = locationCompletionHandler else { return }
        
        manager.stopUpdatingLocation()
        
        let message = "当前位置: 经度 \(location.coordinate.longitude), 纬度 \(location.coordinate.latitude)"
        handler(message, true)
        locationCompletionHandler = nil
    }
    
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        manager.stopUpdatingLocation()
        locationCompletionHandler?("获取位置失败: \(error.localizedDescription)", false)
        locationCompletionHandler = nil
    }
}