using System;
using System.Collections;
using System.IO;
using UnityEngine;
using UnityEngine.UIElements;

using System.Runtime.InteropServices;


public class VoiceController : MonoBehaviour
{
    // Start is called once before the first execution of Update after the MonoBehaviour is created
    private VisualElement waveForm;
    private Button voiceBtn;
    private Coroutine waveCoroutine;
    private AudioClip audioClip;    // 保存的音频
    private bool isRecording = false;
    private string filePathWav, filePathZip; 


    void Start()
    {
        var root = GetComponent<UIDocument>().rootVisualElement;
        var voiceArea = root.Q<VisualElement>("voiceArea");
        waveForm = voiceArea.Q<VisualElement>("waveForm");
        voiceBtn = voiceArea.Q<Button>("voice");

        // root加载完成后，所有element算出位置后再进行计算
        root.RegisterCallback<GeometryChangedEvent>(e => OnMainMenuClickGeometryChanged(e));
        voiceBtn.RegisterCallback<PointerDownEvent>(e => VoiceBtnPointerDown(e), TrickleDown.TrickleDown); // TrickleDown.TrickleDown参数，确保事件在捕获阶段优先处理。
        voiceBtn.RegisterCallback<PointerUpEvent>(e => VoiceBtnPointerUp(e));
    }

    // Update is called once per frame
    //void Update()
    //{
        
    //}

    IEnumerator WaveFormAnimation()
    {
        while (true)
        {
            waveForm.style.height = UnityEngine.Random.Range(15f, 30f);
            float alpha = UnityEngine.Random.Range(0.6f, 1f);
            waveForm.style.unityBackgroundImageTintColor = new Color(1f, 1f, 1f, alpha);
            yield return new WaitForSeconds(0.1f);
        }
    }

    void OnMainMenuClickGeometryChanged(GeometryChangedEvent evt)
    {
        if (waveCoroutine == null)
        {
            waveCoroutine = StartCoroutine(WaveFormAnimation());
        }
    }

    // 语言控制按键按下的触发事件
    void VoiceBtnPointerDown(PointerDownEvent evt)
    {

        Debug.Log("voice button pointer down.");
        StartRecording();
        waveForm.visible = true;
    }

    // 语音控制按键松开事件
    void VoiceBtnPointerUp(PointerUpEvent evt)
    {
        Debug.Log("voice button pointer up.");
        StopRecording();
        waveForm.visible = false;
    }

    // 开始录音
    void StartRecording()
    {
        if (isRecording) return; // 如果已经在录音，则不再重复开始

        // 设置录音文件名和路径
        filePathWav = Path.Combine(Application.persistentDataPath, "voiceCommand.wav");
        filePathZip = Path.Combine(Application.persistentDataPath, "voiceCommand.mp3");

        // 检测目录是否存在不存在就创建
        string directoryPath = Path.GetDirectoryName(filePathWav);
        if (!Directory.Exists(directoryPath))
        {
            Directory.CreateDirectory(directoryPath);
        }
        //删除旧文件
        if (File.Exists(filePathWav))
        {
            File.Delete(filePathWav);
        }
        if (File.Exists(filePathZip))
        {
            File.Delete(filePathZip);
        }

        // 开始录音，最长4秒
        audioClip = Microphone.Start(null, false, 4, 44100);
        isRecording = true;
        Debug.Log("开始录音...");
    }

    // 停止录音
    void StopRecording()
    {
        if (!isRecording) return; // 如果没有在录音，则直接返回

        // 停止录音
        Microphone.End(null);
        isRecording = false;
        Debug.Log("停止录音...");

        // 保存录音为WAV文件
        SaveWavFile(filePathWav, audioClip);
        Debug.Log("录音已保存到: " + filePathWav);
        ZipFileController.ZipFile(filePathWav, filePathZip);
    }

    // 保存音频文件wav
    void SaveWavFile(string path, AudioClip audio) {
        // 创建文件流
        using (FileStream fileStream = new(path, FileMode.Create))
        {
            using (BinaryWriter writer = new BinaryWriter(fileStream))
            {
                // 写入WAV文件头
                writer.Write(new char[4] { 'R', 'I', 'F', 'F' }); // RIFF标志
                writer.Write(36 + audio.samples * 2); // 文件大小
                writer.Write(new char[4] { 'W', 'A', 'V', 'E' }); // WAVE标志
                writer.Write(new char[4] { 'f', 'm', 't', ' ' }); // fmt标志
                writer.Write(16); // fmt块大小
                writer.Write((ushort)1); // 音频格式（PCM）
                writer.Write((ushort)audio.channels); // 声道数
                writer.Write(audio.frequency); // 采样率
                writer.Write(audio.frequency * audio.channels * 2); // 字节率
                writer.Write((ushort)(audio.channels * 2)); // 块对齐
                writer.Write((ushort)16); // 位深度
                writer.Write(new char[4] { 'd', 'a', 't', 'a' }); // data标志
                writer.Write(audio.samples * 2); // 数据大小

                // 写入音频数据
                float[] samples = new float[audio.samples * audio.channels];
                audio.GetData(samples, 0);

                for (int i = 0; i < samples.Length; i++)
                {
                    writer.Write((short)(samples[i] * short.MaxValue)); // 将浮点数转换为16位整数
                }
            }
        }
    }

}