using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;
using ForgejoReleaseSync.DTOs.Forgejo;
using Microsoft.Extensions.Logging;

namespace ForgejoReleaseSync.Services;

public class ForgejoService(IHttpClientFactory httpClientFactory, ILogger<ForgejoService> logger)
{
    public async Task<ForgejoReleaseResponseDto> CreateReleaseAsync(
        string owner, string repo, string body, string name, string tagName, CancellationToken token = default)
    {
        try
        {
            var dto = new ForgejoCreateReleaseDto(body, false, false, name, false, tagName, "");
            var json = JsonSerializer.Serialize(dto, AppJsonSerializerContext.Default.ForgejoCreateReleaseDto);

            var httpClient = httpClientFactory.CreateClient("forgejo");

            using var request = new HttpRequestMessage(
                HttpMethod.Post, $"api/v1/repos/{owner}/{repo}/releases")
            {
                Content = new StringContent(json, Encoding.UTF8, "application/json")
            };

            using var response = await httpClient.SendAsync(request, token);
            response.EnsureSuccessStatusCode();

            await using var stream = await response.Content.ReadAsStreamAsync(token);
            var created = await JsonSerializer.DeserializeAsync(
                stream, AppJsonSerializerContext.Default.ForgejoReleaseResponseDto, token);

            return created ?? throw new InvalidOperationException("Forgejo returned an empty release response");
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to create Forgejo release {Tag} for {Owner}/{Repo}", tagName, owner, repo);
            throw;
        }
    }

    public async Task<List<ForgejoReleaseResponseDto>> FetchRepoReleasesAsync(
        string owner, string repo, CancellationToken token = default)
    {
        try
        {
            var httpClient = httpClientFactory.CreateClient("forgejo");

            using var response = await httpClient.GetAsync(
                $"api/v1/repos/{owner}/{repo}/releases?per_page=3&page=1", token);
            response.EnsureSuccessStatusCode();

            await using var stream = await response.Content.ReadAsStreamAsync(token);
            var releases = await JsonSerializer.DeserializeAsync(
                stream, AppJsonSerializerContext.Default.ListForgejoReleaseResponseDto, token);

            return releases ?? [];
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to fetch Forgejo releases for {Owner}/{Repo}", owner, repo);
            throw;
        }
    }

    public async Task UploadReleaseAssetAsync(
        string owner, string repo, long releaseId, string filePath, CancellationToken token = default)
    {
        try
        {
            var httpClient = httpClientFactory.CreateClient("forgejo");

            await using var fileStream = new FileStream(
                filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, useAsync: true);

            using var fileContent = new StreamContent(fileStream);
            fileContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");

            using var formData = new MultipartFormDataContent();
            formData.Add(fileContent, "attachment", Path.GetFileName(filePath));

            using var request = new HttpRequestMessage(
                HttpMethod.Post,
                $"api/v1/repos/{owner}/{repo}/releases/{releaseId}/assets")
            {
                Content = formData
            };

            using var response = await httpClient.SendAsync(
                request, HttpCompletionOption.ResponseHeadersRead, token);
            response.EnsureSuccessStatusCode();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to upload asset {Path} to {Owner}/{Repo}", filePath, owner, repo);
            throw;
        }
    }
}