import Flutter
import UIKit
import ExternalAccessory
import AVFoundation

// 这个文件是为了满足Flutter插件的命名约定
// 实际实现在ClassicBluetoothPlugin.swift中
public class SwiftClassicBluetoothPlugin: NSObject, FlutterPlugin {
    private let TAG = "ClassicBluetoothPlugin"
    private var methodChannel: FlutterMethodChannel?
    private var eventChannel: FlutterEventChannel?
    private var eventSink: FlutterEventSink?
    private let bluetoothHelper = ClassicBluetoothHelper()
    
    public static func register(with registrar: FlutterPluginRegistrar) {
        let channel = FlutterMethodChannel(name: "com.yunqiinnovation.classic_bluetooth/methods", binaryMessenger: registrar.messenger())
        let instance = SwiftClassicBluetoothPlugin()
        registrar.addMethodCallDelegate(instance, channel: channel)
        
        // 设置事件通道（用于蓝牙状态监控）
        let eventChannel = FlutterEventChannel(name: "com.yunqiinnovation.classic_bluetooth/events", binaryMessenger: registrar.messenger())
        eventChannel.setStreamHandler(instance)
        
        instance.methodChannel = channel
        instance.eventChannel = eventChannel
        
        // 记录插件初始化
        print("经典蓝牙插件初始化成功")
    }
    
    public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
        switch call.method {
        case "getConnectedDevices":
            getConnectedDevices(result: result)
        case "isBluetoothEnabled":
            result(bluetoothHelper.isBluetoothEnabled())
        default:
            result(FlutterMethodNotImplemented)
        }
    }
    
    private func getConnectedDevices(result: @escaping FlutterResult) {
        // 先检查蓝牙状态
        // if !bluetoothHelper.isBluetoothEnabled() {
        //     print("蓝牙未启用，无法获取设备")
        //     result([])
        //     return
        // }
        
        bluetoothHelper.getConnectedDevices { devices, error in
            if let error = error {
                print("获取设备失败: \(error.localizedDescription)")
                result(FlutterError(code: "BLUETOOTH_ERROR", message: error.localizedDescription, details: nil))
                return
            }
            
            print("获取到 \(devices.count) 个蓝牙设备")
            for device in devices {
                if let name = device["name"], let address = device["address"], let type = device["type"] {
                    print("设备: \(name), 地址: \(address), 类型: \(type)")
                }
            }
            
            // 转换为Flutter可用的格式
            let resultList = devices.map { device -> [String: String] in
                // 仅保留Flutter端需要的字段
                return [
                    "name": device["name"] ?? "未知设备",
                    "address": device["address"] ?? "未知地址"
                ]
            }
            
            result(resultList)
        }
    }
    
    // 发送事件到Flutter
    private func sendEvent(_ event: [String: Any]) {
        if let eventSink = eventSink {
            eventSink(event)
        }
    }
}

// MARK: - FlutterStreamHandler
extension SwiftClassicBluetoothPlugin: FlutterStreamHandler {
    public func onListen(withArguments arguments: Any?, eventSink events: @escaping FlutterEventSink) -> FlutterError? {
        self.eventSink = events
        
        // 开始监听蓝牙状态变化
        bluetoothHelper.startBluetoothStateMonitoring { [weak self] eventType, data in
            guard let self = self else { return }
            
            switch eventType {
            case .stateChanged:
                if let state = data["state"] as? String {
                    print("蓝牙状态变化: \(state)")
                    self.sendEvent([
                        "type": "stateChanged",
                        "state": state,
                        "timestamp": Int(Date().timeIntervalSince1970 * 1000)
                    ])
                }
            case .deviceConnected:
                if let device = data["device"] as? [String: String] {
                    print("设备连接: \(device["name"] ?? "未知") [\(device["address"] ?? "未知")]")
                    // 只保留Flutter端需要的字段
                    let deviceData: [String: String] = [
                        "name": device["name"] ?? "未知设备",
                        "address": device["address"] ?? "未知地址"
                    ]
                    self.sendEvent([
                        "type": "deviceConnected",
                        "device": deviceData,
                        "timestamp": Int(Date().timeIntervalSince1970 * 1000)
                    ])
                }
            case .deviceDisconnected:
                if let device = data["device"] as? [String: String] {
                    print("设备断开: \(device["name"] ?? "未知") [\(device["address"] ?? "未知")]")
                    // 只保留Flutter端需要的字段
                    let deviceData: [String: String] = [
                        "name": device["name"] ?? "未知设备",
                        "address": device["address"] ?? "未知地址"
                    ]
                    self.sendEvent([
                        "type": "deviceDisconnected",
                        "device": deviceData,
                        "timestamp": Int(Date().timeIntervalSince1970 * 1000)
                    ])
                }
            }
        }
        
        // 报告当前蓝牙状态
        bluetoothHelper.reportCurrentBluetoothState()
        
        return nil
    }
    
    public func onCancel(withArguments arguments: Any?) -> FlutterError? {
        eventSink = nil
        bluetoothHelper.stopBluetoothStateMonitoring()
        return nil
    }
}