import Foundation
import Flutter
import UIKit
import AliyunVideoSDKPro
public class CameraViewFactory: NSObject, FlutterPlatformViewFactory {
    var messenger: FlutterBinaryMessenger!
    public func create(withFrame frame: CGRect, viewIdentifier viewId: Int64, arguments args: Any?) -> FlutterPlatformView {
        return CameraView(withFrame: frame, viewIdentifier: viewId, arguments: args, binaryMessenger: messenger)
    }
    @objc public init(messenger: (NSObject & FlutterBinaryMessenger)?) {
        super.init()
        self.messenger = messenger
    }
    
    public func createArgsCodec() -> FlutterMessageCodec & NSObjectProtocol {
        return FlutterStandardMessageCodec.sharedInstance()
    }
    
}
public class CameraView: NSObject, FlutterPlatformView, AliyunIRecorderDelegate, AliyunIPlayerCallback, AliyunIExporterCallback, AliyunIRenderCallback {
    public func playerDidEnd() {
        
    }
    
    public func playProgress(_ playSec: Double, streamProgress streamSec: Double) {
        
    }
    
    public func playError(_ errorCode: Int32) {
        
    }
    
    public func seekDidEnd() {
        
    }
    
    public func playerDidStart() {
        
    }
    
    
    fileprivate var viewId: Int64!
    fileprivate var cameraView: UIView!
    fileprivate var channel: FlutterMethodChannel!
    fileprivate var recordPath: String?
    fileprivate var taskPath: String?
    fileprivate var recorder: AliyunIRecorder!
    fileprivate var composeResult: FlutterResult?
    public init(withFrame frame: CGRect, viewIdentifier viewId: Int64, arguments args: Any?, binaryMessenger: FlutterBinaryMessenger) {
        super.init()
        
        self.viewId = viewId
       
        self.cameraView = UIView()
        self.cameraView.frame = UIScreen.main.bounds
        self.channel = FlutterMethodChannel(name: "flutter_ali_camera_\(viewId)", binaryMessenger: binaryMessenger)
        self.channel.setMethodCallHandler({
            [weak self]
            (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
            if let this = self {
                this.onMethodCall(call: call, result: result)
            }
        })
    }
    
    
    public func view() -> UIView {
        return self.cameraView
    }
    func onMethodCall(call: FlutterMethodCall, result: @escaping FlutterResult) {
        let args = call.arguments as? [String: Any]
        let method = call.method
       if call.method == "initializeSdk" {
//            initSdk(result)
            result(true)
        } else if call.method == "cleanAudioData" {
            let videoId = args!["videoId"] as! String
            let pathAudio = args!["pathAudio"] as! String
            deleteFileWithPrefix(folderPath: pathAudio, prefix: "\(videoId)_")
            result(true)
        } else if call.method == "getFilterParentPath" {
            print("path \(Bundle.main.path(forResource: "icon", ofType: "png"))")
            let url = Bundle.main.bundlePath
            result("\(url)/filter/")
        } else if method == "startPreview" {
            initCameraView()
            recorder?.clipManager?.deleteAllPart()
            recorder?.startPreview(withPositon: AliyunIRecorderCameraPosition.front)
            result(true)
        } else 
        if method == "startPreview" {
            initCameraView()
            recorder?.clipManager?.deleteAllPart()
            recorder?.startPreview(withPositon: AliyunIRecorderCameraPosition.front)
            result(true)
        } else if method == "setRecordPath" {
            self.recordPath = args!["path"] as? String
            self.taskPath = args!["taskPath"] as? String
            result(true)
        } else if method == "onStop" {
            onStop()
            result(true)
        } else if method == "onResume" {
            recorder?.startPreview(withPositon: AliyunIRecorderCameraPosition.front)
            result(true)
        } else if method == "onDestory" {
            onStop()
            onDestory()
            result(true)
        } else if method == "switchCamera" {
            recorder.switchCameraPosition()
            result(true)
        } else if method == "setBeautyLevel" {
            let level =  args!["level"] as! Int
            recorder.beautifyStatus = (level == 0)
            recorder.beautifyValue =  Int32(level)
            result(true)
        } else if method == "startRecord" {
            let maxDuration = args!["maxDuration"] as! Int
            let videoId = args!["videoId"] as! String
            let index = args!["index"] as! Int
            let fileName = args!["fileName"] as! String
            if recorder?.clipManager?.videoAbsolutePaths != nil && recorder?.clipManager?.videoAbsolutePaths.count != 0 {
                recorder?.clipManager?.deletePart()
            }
            clearCacheVideo(videoId: videoId, index: index)
            recorder?.outputPath = self.recordPath! + "\(fileName).mp4"
            recorder?.clipManager?.maxDuration = CGFloat(Float(maxDuration) / 1000.0)
            recorder?.startRecording()
            result(true)
        } else if method == "stopRecord" {
            recorder?.stopRecording()
            result(true)
        } else if method == "finishRecord" {
            recorder?.finishRecording()
            result(true)
        } else if method == "setFilter" {
            let path: String? = args?["path"] as? String
            if path == nil || path?.count == 0 {
                // delete filter
                recorder?.deleteFilter()
                return
            }
            recorder?.apply(AliyunEffectFilter.init(file: path))
        } else if method == "startCompose" {
            let outputPath = args!["outputPath"] as! String
            let bgmPath = args!["bgmPath"] as! String
            let paths = args!["paths"] as! [String]
            let durations = args!["durations"] as! [Int]
            composeResult = result
            startCompose(outputPath: outputPath, bgmPath: bgmPath, paths: paths, durations: durations)
        } else if method == "create"{
            result(FlutterMethodNotImplemented)
        }
    }
    private func initCameraView() {
        recorder = AliyunIRecorder.init(delegate: self, videoSize: CGSize(width: 720, height: 1280))
        recorder?.preview = self.cameraView
        recorder?.taskPath = self.taskPath
        recorder?.clipManager?.maxDuration = 0
    }
    
    private func onStop() {
        recorder?.stopRecording()
        recorder?.stopPreview()
    }
    
    private func onDestory() {
        recorder?.destroy()
        recorder = nil
        cameraView = nil
    }
    
    var editor: AliyunEditor?
    private func startCompose(outputPath: String, bgmPath: String, paths: [String], durations: [Int]) {
        AliyunVideoSDKInfo.print()
        if durations.count != paths.count {
            return
        }
//        AliyunVideoSDKInfo.setLogLevel(AlivcLogLevel.debug)
        
        let importer = AliyunImporter.init(path: self.taskPath, outputSize: CGSize(width: 480, height: 720))
        let param = AliyunVideoParam.init()
        param.fps = 30
        param.gop = 30
        param.videoQuality = AliyunVideoQuality.medium
        param.scaleMode = AliyunScaleMode.fill
        // 编码模式
        param.codecType = AliyunVideoCodecType.hardware
        importer?.setVideoParam(param)
        for index in 0..<paths.count {
            print("paths: \(paths[index])")
            // 取出有效的document地址
            let documentRance: Range = paths[index].range(of: "/Documents/")!
            let distance: Int = paths[index].distance(from: paths[index].startIndex, to: documentRance.upperBound)
            let truePath = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)[0] + paths[index].subString(from: distance - 1)
            print("true path: \(truePath)")
            
            importer?.addMediaClip(AliyunClip.init(videoPath: truePath, animDuration: 0))
        }
        importer?.generateProjectConfigure()
        editor = AliyunEditor.init(path: self.taskPath, preview: nil)
        editor?.apply(AliyunEffectMusic.init(file: bgmPath))
        editor?.delegate = self
        editor?.startEdit()
        
        let exporter = editor?.getExporter()
        exporter?.startExport(outputPath)
    }
    
    private func clearCacheVideo(videoId: String, index: Int) {
        deleteFileWithPrefix(folderPath: self.recordPath!, prefix: "\(videoId)_\(index)_")
    }
    
    private func deleteFileWithPrefix(folderPath: String, prefix: String) {
        let manager = FileManager.default
        let files:[String] = try! manager.contentsOfDirectory(atPath: folderPath)
        
        for file in files{
            do {
                if file.hasPrefix(prefix) {
                    try manager.removeItem(atPath: folderPath + "/\(file)")
                }
            } catch {
                print("faild to delete")
            }
        }
    }
    
    public func recorderDeviceAuthorization(_ status: AliyunIRecorderDeviceAuthor) {
        if status == AliyunIRecorderDeviceAuthor.enabled {
            print("sdk enabled")
        } else {
            print("sdk disabled")
        }
    }
    
    public func recorderVideoDuration(_ duration: CGFloat) {
        print("recorderVideoDuration:\(duration)")
        channel.invokeMethod("recordProgress", arguments: ["progress": Int(duration * 1000)])
    }
    
    public func recoderError(_ error: Error!) {
        print("recoderError")
        recorder?.finishRecording()
    }
    
    public func recorderDidStopWithMaxDuration() {
        print("recorderDidStopWithMaxDuration")
        recorder?.finishRecording()
    }
    
    public func recorderDidFinishRecording() {
        channel.invokeMethod("recordProgress", arguments: ["progress":  Int((recorder?.clipManager?.maxDuration ?? 0) * 1000), "path": recorder?.outputPath])
    }
    public func exporterDidCancel() {
        
    }
    
    public func exportProgress(_ progress: Float) {
        print("exportProgress")
    }
    
    public func exportError(_ errorCode: Int32) {
        print("export error : \(errorCode)")
        composeResult?(false)
    }
    
    public func exporterDidStart() {
        print("exporterDidStart")
    }
       
    public func exporterDidEnd(_ outputPath: String!) {
        composeResult?(true)
    }
}
extension String {
  func toInt() -> Int? {
      return Int(self)
  }
  func toFloat() -> Float? {
      return Float(self)
  }
  func toDouble() -> Double? {
      return Double(self)
  }
  //MARK:- 去除字符串两端的空白字符
  func trim() -> String {
      return self.trimmingCharacters(in: CharacterSet.whitespaces)
  }
  func subString(to: Int) -> String {
    var to = to
    if to > self.count {
        to = self.count
    }
    return String(self.prefix(to))
}
  func subString(from: Int) -> String {
    if from >= self.count {
        return ""
    }
    let startIndex = self.index(self.startIndex, offsetBy: from)
    let endIndex = self.endIndex
    return String(self[startIndex..<endIndex])
}
 func subString(start: Int, end: Int) -> String {
    if start < end {
        let startIndex = self.index(self.startIndex, offsetBy: start)
        let endIndex = self.index(self.startIndex, offsetBy: end)
        
        return String(self[startIndex..<endIndex])
    }
    return ""
 }
    
    
}