namespace sh.actions.package_cleanup.Service;

using System.Net.Http.Json;
using Microsoft.Extensions.Logging;
using sh.actions.package_cleanup.Models;

public class GiteaPackageService(
    ILogger<GiteaPackageService> logger,
    IConfiguration configuration,
    HttpClient httpClient)
    : IGiteaPackageService
{
    private string GetBaseUrl() =>
        $"{configuration["URL"]?.TrimEnd('/')}/packages/{configuration["OWNER"]}";

    private void AddAuthorizationHeader(HttpRequestMessage request)
    {
        var token = configuration["API_TOKEN"];
        if (!string.IsNullOrEmpty(token))
        {
            request.Headers.Add("Authorization", $"token {token}");
        }
    }

    public async Task<IEnumerable<GiteaPackage>> GetPackagesByNameAsync(string name, CancellationToken cancellationToken = default)
    {
        try
        {
            var baseUrl = GetBaseUrl();
            var packages = new List<GiteaPackage>();
            
            // Parse comma-separated types
            var types = (configuration["TYPES"] ?? "")
                .Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);

            if (types.Length == 0)
            {
                logger.LogWarning("No package types configured");
                return packages;
            }

            foreach (var type in types)
            {
                var page = 1;

                while (true)
                {
                    var url = $"{baseUrl}/{type}/{name}?page={page}";
                    logger.LogInformation("Fetching packages from Gitea: {Url}", url);

                    var request = new HttpRequestMessage(HttpMethod.Get, url);
                    AddAuthorizationHeader(request);

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

                    var fetchedPackages =
                        await response.Content.ReadFromJsonAsync<List<GiteaPackage>>(cancellationToken: cancellationToken)
                        ?? [];

                    if (fetchedPackages.Count == 0)
                    {
                        break;
                    }

                    packages.AddRange(fetchedPackages);
                    logger.LogInformation("Fetched {Count} packages from page {Page}", fetchedPackages.Count, page);

                    page++;
                }
            }

            logger.LogInformation("Successfully fetched {Count} packages for name '{Name}'", packages.Count, name);
            return packages;
        }
        catch (HttpRequestException ex)
        {
            logger.LogError(ex, "Error fetching packages from Gitea for name '{Name}'", name);
            throw;
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Unexpected error fetching packages for name '{Name}'", name);
            throw;
        }
    }

    public async Task<IEnumerable<GiteaPackage>> GetPackagesByOwnerAsync(CancellationToken cancellationToken = default)
    {
        try
        {
            var allPackages = new List<GiteaPackage>();
            
            var names = (configuration["NAMES"] ?? "")
                .Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);

            if (names.Length == 0)
            {
                logger.LogWarning("No package names configured");
                return allPackages;
            }

            foreach (var name in names)
            {
                var packages = await GetPackagesByNameAsync(name, cancellationToken);
                allPackages.AddRange(packages);
            }

            logger.LogInformation("Successfully fetched {Count} packages in total", allPackages.Count);
            return allPackages;
        }
        catch (HttpRequestException ex)
        {
            logger.LogError(ex, "Error fetching packages from Gitea");
            throw;
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Unexpected error fetching packages");
            throw;
        }
    }

    public async Task DeletePackage(GiteaPackage package, CancellationToken cancellationToken = default)
    {
        try
        {
            var baseUrl = GetBaseUrl();
            var url = $"{baseUrl}/{package.Type}/{package.Name}/{package.Version}";
            logger.LogInformation("Deleting package {PackageName} (ID: {PackageId}) from Gitea", 
                package.Name, package.Id);

            var request = new HttpRequestMessage(HttpMethod.Delete, url);
            AddAuthorizationHeader(request);

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

            logger.LogInformation("Successfully deleted package {PackageName} (ID: {PackageId})", 
                package.Name, package.Id);
        }
        catch (HttpRequestException ex)
        {
            logger.LogError(ex, "Error deleting package {PackageName} (ID: {PackageId}) from Gitea", 
                package.Name, package.Id);
            throw;
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Unexpected error deleting package {PackageName} (ID: {PackageId})", 
                package.Name, package.Id);
            throw;
        }
    }
}