//
//  AliCameraViewFactory.swift
//  AliyunOSSiOS
//
//  Created by weihong huang on 2020/8/20.
//

import Flutter
import Foundation
import AliyunVideoSDKPro

public class AliCameraViewFactory : NSObject, FlutterPlatformViewFactory {
    var messeneger: FlutterBinaryMessenger!
    
    public func create(withFrame frame: CGRect, viewIdentifier viewId: Int64, arguments args: Any?) -> FlutterPlatformView {
        return AliCameraView(frame: frame, viewIdentifier: viewId, arguments: args, binaryMessenger: self.messeneger)
    }
    
    init(messeneger: FlutterBinaryMessenger) {
        super.init()
        self.messeneger = messeneger
    }
    
    public func createArgsCodec() -> FlutterMessageCodec & NSObjectProtocol {
        return FlutterStandardMessageCodec.sharedInstance()
    }
}

public class AliCameraView : NSObject, FlutterPlatformView, AliyunIRecorderDelegate, AliyunIExporterCallback {
    fileprivate var uiView: UIView = UIView()
    fileprivate var recorder: AliyunIRecorder!
    fileprivate var methodChannel: FlutterMethodChannel!
    fileprivate var taskPath: String!
    fileprivate var aliyunEditor: AliyunEditor!
    fileprivate var exportResult: FlutterResult!
    
    init(frame: CGRect, viewIdentifier viewId: Int64, arguments args: Any?, binaryMessenger: FlutterBinaryMessenger) {
        super.init()
        // init view size
        let dict = args as! [String: Any]
        self.uiView.frame = CGRect.init(x: dict["x"] as? Float64 ?? 0,
                                        y: dict["y"] as? Float64 ?? 0,
                                        width: dict["width"] as? Float64 ?? Float64(UIScreen.main.bounds.width),
                                        height: dict["height"] as? Float64 ?? Float64(UIScreen.main.bounds.height))
        // init method channel
        self.methodChannel = FlutterMethodChannel(name: "com.i2edu.cameraLib/camera_view_\(viewId)", binaryMessenger: binaryMessenger)
        self.methodChannel?.setMethodCallHandler ({
            [weak self]
            (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
            if let this = self {
                this.onMethonCall(call: call, result: result)
            }
        })
    }
    
    public func view() -> UIView {
        return self.uiView
    }
    
    func onMethonCall(call: FlutterMethodCall, result: @escaping FlutterResult) {
        let args = call.arguments as? [String: Any]
        switch call.method {
        case "create":
            let recordOptions = args?["recordOption"] as? [String: Any]
            let taskPath = args?["iosTaskPath"] as! String
            do {
                try setUpCameraView(recordOption: recordOptions!, taskPath: taskPath)
                result(true)
            } catch {
                result(false)
            }
            break
        case "startPreview":
            do {
                try startPreview()
                result(true)
            } catch {
                result(false)
            }
            break;
        case "stopPreview":
            do {
                try stopPreview()
                result(true)
            } catch {
                result(false)
            }
            break;
        case "switchCamera":
            do {
                try switchCamera()
                result(true)
            } catch {
                result(false)
            }
            break;
        case "setBeauty":
            do {
                try setBeauty(level: args?["level"] as? Int32 ?? 0)
                result(true)
            } catch {
                result(false)
            }
            break;
        case "setFilter":
            do {
                try setFilter(path: args?["path"] as? String)
                result(true)
            } catch {
                result(false)
            }
            break;
        case "startRecord":
            do {
                try startRecord(
                    maxDuration: args?["max"] as! Int32,
                    recordPath: args?["recordPath"] as! String)
                result(true)
            } catch {
                result(FlutterError.init(code: "1001", message: error.localizedDescription, details: nil))
            }
            break
        case "startCompose":
            do {
                self.exportResult = result
                let composeOption = args?["composeOption"] as! [String: Any]
                try startCompose(
                    outputPath: args?["outputPath"] as! String,
                    bgmPath: args?["bgmPath"] as? String,
                    paths: args?["paths"] as! [String],
                    durations: args?["durations"] as! [Int32],
                    composeOption: composeOption
                )
            } catch {
                result(FlutterError.init(code: "1002", message: error.localizedDescription, details: nil))
            }
            break
        case "onDestroy":
            do {
                try onDestroy()
                result(true)
            } catch {
                result(false)
            }
            break
        default:
            result(FlutterMethodNotImplemented)
        }
    }
    
    func setUpCameraView(recordOption: [String: Any], taskPath: String) throws {
        self.taskPath = taskPath

        self.recorder = AliyunIRecorder.init(delegate: self, videoSize: CGSize(width: recordOption["videoWidth"] as! Int, height: recordOption["videoHeight"] as! Int))
        let keys = recordOption.keys
        if (keys.contains("fps")) {
            self.recorder.recordFps = recordOption["fps"] as! Int32
        }
        if (keys.contains("videoCodecs")) {
            if (recordOption["videoCodecs"] as! Int == 0) {
                self.recorder.encodeMode = 0
            } else {
                self.recorder.encodeMode = 1
            }
        }
        if (keys.contains("quality")) {
            self.recorder.videoQuality = AliyunVideoQuality.init(rawValue: recordOption["quality"] as! Int) ?? AliyunVideoQuality.medium
        }
        if (keys.contains("videoBitrate")) {
            self.recorder.bitrate = recordOption["videoBitrate"] as! Int32
        }
        if (keys.contains("gop")) {
            self.recorder.gop = recordOption["gop"] as! Int32
        }
        
        self.recorder?.beautifyStatus = false
        self.recorder?.beautifyValue = 0
        self.recorder?.preview = self.uiView
    }
    
    func startPreview() throws {
        self.recorder?.startPreview(withPositon: AliyunIRecorderCameraPosition.front)
    }
    
    func stopPreview() throws {
        self.recorder?.stopPreview()
    }
    
    func switchCamera() throws {
        self.recorder?.switchCameraPosition()
    }
    
    func setBeauty(level: Int32) throws {
        self.recorder?.beautifyStatus = level != 0
        self.recorder?.beautifyValue = level
    }
    
    func setFilter(path: String?) throws {
        if path == nil || path?.count == 0 {
            recorder?.deleteFilter()
        } else {
            self.recorder?.apply(AliyunEffectFilter.init(file: path))
        }
    }
    
    func startRecord(maxDuration: Int32, recordPath: String) throws {
        recorder?.taskPath = taskPath
        recorder?.clipManager?.deleteAllPart()
        recorder?.outputPath = recordPath
        recorder?.clipManager?.maxDuration = CGFloat(Float(maxDuration) / 1000.0)
        recorder?.startRecording()
    }
    
    func startCompose(outputPath: String, bgmPath: String?, paths: [String], durations: [Int32], composeOption: [String: Any]) throws {
        // set up AliyunImporter
        let importer = AliyunImporter.init(
            path: self.taskPath,
            outputSize: CGSize(width: composeOption["outputWidth"] as! CGFloat, height: composeOption["outputHeight"] as! CGFloat))
        let composeParam = AliyunVideoParam.init()
        let keys = composeOption.keys
        if keys.contains("gop") {
            composeParam.gop = composeOption["gop"] as! Int32
        }
        if keys.contains("bitrate") {
            composeParam.bitrate = composeOption["bitrate"] as! Int32
        }
        if keys.contains("frameRate") {
            composeParam.fps = composeOption["frameRate"] as! Int32
        }
        if keys.contains("videoCodecs") {
            var codecType:AliyunVideoCodecType
            let type = composeOption["videoCodecs"] as! Int32
            if type == 0 {
                codecType = AliyunVideoCodecType.hardware
            } else if type == 1 {
                codecType = AliyunVideoCodecType.openh264
            } else if type == 2 {
                codecType = AliyunVideoCodecType.fFmpeg
            } else {
                codecType = AliyunVideoCodecType.typeAuto
            }
            composeParam.codecType = codecType
        }
        if keys.contains("quality") {
            composeParam.videoQuality =
                AliyunVideoQuality.init(rawValue: composeOption["quality"] as! Int) ?? AliyunVideoQuality.medium
        }
        if keys.contains("scaleMode") {
            composeParam.scaleMode =
                AliyunScaleMode.init(rawValue: composeOption["scaleMode"] as! Int) ?? AliyunScaleMode.fit
        }
        for index in 0..<paths.count {
            importer?.addMediaClip(AliyunClip.init(videoPath: paths[index], animDuration: 0))
        }
        importer?.setVideoParam(composeParam)
        importer?.generateProjectConfigure()
        // set up AliyunEditor
        self.aliyunEditor = AliyunEditor.init(path: self.taskPath, preview: nil)
        if bgmPath != nil && bgmPath?.count != 0 {
            self.aliyunEditor.apply(AliyunEffectMusic.init(file: bgmPath))
        }
        self.aliyunEditor.delegate = self
        self.aliyunEditor.startEdit()
        
        let exporter = self.aliyunEditor.getExporter()
        exporter?.startExport(outputPath)
    }
    
    func onDestroy() throws {
        try stopPreview()
        recorder?.stopRecording()
        recorder?.destroy()
        recorder = nil
    }
    
    // ----- record delegate
    
    public func recorderDeviceAuthorization(_ status: AliyunIRecorderDeviceAuthor) {
        if status == AliyunIRecorderDeviceAuthor.enabled {
            print("sdk enabled")
        } else {
            print("sdk disabled")
        }
    }
    
    public func recorderVideoDuration(_ duration: CGFloat) {
        print("record update \(duration)")
        methodChannel.invokeMethod("recordUpdate", arguments: ["progress": Int(duration * 1000)])
    }
    
    public func recorderDidStopWithMaxDuration() {
        print("record stop with max duration")
        recorder?.finishRecording()
    }
    
    public func recorderDidFinishRecording() {
        print("record completed")
        methodChannel.invokeMethod("recordUpdate", arguments: ["progress": Int((recorder?.clipManager?.maxDuration ?? 0) * 1000), "path": recorder?.outputPath ?? ""])
    }
    
    public func recoderError(_ error: Error!) {
        print("record error \(error.localizedDescription)")
        recorder?.finishRecording()
    }
    
    // ----- export delegate
    public func exporterDidStart() {
        print("export did start")
    }
    
    public func exportProgress(_ progress: Float) {
        print("export progress \(progress)")
    }
    
    public func exportError(_ errorCode: Int32) {
        print("export error \(errorCode)")
        exportResult(false)
    }
    
    public func exporterDidEnd(_ outputPath: String!) {
        print("export did end \(outputPath ?? "")")
        exportResult(true)
    }
    
    public func exporterDidCancel() {
        print("export did cancel")
    }
}


extension AliCameraView : AliyunIPlayerCallback, AliyunIRenderCallback{
    public func playerDidEnd() {
    }
    
    public func playProgress(_ playSec: Double, streamProgress streamSec: Double) {
    }
    
    public func playError(_ errorCode: Int32) {
    }
    
    public func seekDidEnd() {
    }
    
    public func playerDidStart() {
    }
}