using System.Net.Http.Json;
using System.Text.Json;
using System.Text.Json.Nodes;
using Dpz.Core.Infrastructure;
using Dpz.Core.Public.ViewModel;
using Dpz.Core.Public.ViewModel.Response;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace Dpz.Core.Service.ObjectStorage.Services.Impl;

public class VideoCloudService : IVideoCloudService
{
    private readonly HttpClient _httpClient;
    private readonly ILogger<VideoCloudService> _logger;

    private readonly UpyunOperator _upyunOperator;

    public VideoCloudService(
        HttpClient httpClient,
        IConfiguration configuration,
        ILogger<VideoCloudService> logger
    )
    {
        _httpClient = httpClient;
        _logger = logger;

        var upyunOperator = configuration.GetSection("upyun").Get<UpyunOperator>();
        _upyunOperator =
            upyunOperator
            ?? throw new BusinessException("configuration error,need upyun config node.");
    }

    public async Task<ResponseResult<string?>> VideoScreenshotAsync(
        string pathToFile,
        TimeSpan time
    )
    {
        var result = new ResponseResult<string?>();
        if (string.IsNullOrEmpty(pathToFile))
            throw new ArgumentNullException(nameof(pathToFile));
        var parentPath = pathToFile[..pathToFile.LastIndexOf('/')];

        var request = new HttpRequestMessage(HttpMethod.Post, $"{_upyunOperator.Bucket}/snapshot");
        await request.SignatureAsync(_upyunOperator);
        request.Content = JsonContent.Create(
            new
            {
                source = pathToFile,
                save_as = $"{parentPath}/video.webp",
                point = $"{time.TotalHours:00}:{time.Minutes:00}:{time.Seconds:00}",
                format = "webp",
            }
        );

        try
        {
            var response = await _httpClient.SendAsync(request);
            int? statusCode = (int)response.StatusCode;
            if (response.IsSuccessStatusCode)
            {
                var json = await response.Content.ReadAsStringAsync();
#if DEBUG
                Console.WriteLine(json);
#endif
                var root = JsonNode.Parse(json);
                statusCode = root?["status_code"]?.GetValue<int>();
                if (statusCode == 200)
                {
                    var savePath = root?["save_as"]?.GetValue<string>();
                    if (string.IsNullOrEmpty(savePath))
                        return result.FailResult("没有获取到缩略图地址");
                    return result.SuccessResult(_upyunOperator.Host + savePath);
                }
            }
            return result.FailResult($"设置缩略图失败，响应码：{statusCode}");
        }
        catch (Exception e)
        {
            _logger.LogError(e, "screenshot fail");
            return result.FailResult($"截图失败：{e.Message}");
        }
    }

    public async Task<ResponseResult<VideoMetaDataResponse?>> GetVideoMetaAsync(string pathToFile)
    {
        var result = new ResponseResult<VideoMetaDataResponse?>();

        if (string.IsNullOrEmpty(pathToFile))
            throw new ArgumentNullException(nameof(pathToFile));

        var request = new HttpRequestMessage(
            HttpMethod.Post,
            $"{_upyunOperator.Bucket}/m3u8er/get_meta"
        );
        await request.SignatureAsync(_upyunOperator);
        request.Content = JsonContent.Create(new { m3u8 = pathToFile });

        try
        {
            var response = await _httpClient.SendAsync(request);
            if (!response.IsSuccessStatusCode)
            {
                _logger.LogError(
                    "get video meta fail,response status code:{StatusCode}",
                    response.StatusCode
                );
                return result.FailResult($"获取视频元数据失败，响应状态码：{response.StatusCode}");
            }

            var json = await response.Content.ReadAsStringAsync();

            var root = JsonNode.Parse(json);
            var data = root?["meta"]?.Deserialize(
                typeof(VideoMetaDataResponse),
                new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase }
            );
            if (data is not VideoMetaDataResponse meta)
            {
                return result.FailResult("获取视频元数据失败");
            }

            return result.SuccessResult(meta);
        }
        catch (Exception e)
        {
            _logger.LogError(e, "get video meta fail");
            return result.FailResult($"获取视频元数据失败：{e.Message}");
        }
    }
}