using System.Text.Json.Serialization;

class Redirect
{
    
    private static Dictionary<string,IRedirect> redirects = new Dictionary<string, IRedirect>
    {
        // CrossLang Shell
        {"crosslang-shell",Gitea("https://git.tesses.org/","tesses50/crosslangextras","ShellPackage.crvm",true)},

        // TessesFramework
        {"tessesframework",Std("https://git.tesses.org/tesses50/tessesframework")},
        {"tf-tools-aarch64-linux",TF("tessesframework-tools-aarch64-linux-musl.tar.gz")},
        {"tf-tools-aarch64-macos",TF("tessesframework-tools-aarch64-macos-none.tar.gz")},
        {"tf-tools-aarch64-windows",TF("tessesframework-tools-aarch64-windows-gnu.zip")},
        {"tf-tools-arm-linux",TF("tessesframework-tools-arm-linux-musleabi.tar.gz")},
        {"tf-tools-powerpc-linux",TF("tessesframework-tools-powerpc-linux-musleabihf.tar.gz")},
        {"tf-tools-riscv64-linux",TF("tessesframework-tools-riscv64-linux-musl.tar.gz")},
        {"tf-tools-x86-linux",TF("tessesframework-tools-x86-linux-musl.tar.gz")},
        {"tf-tools-x86-windows",TF("tessesframework-tools-x86-windows-gnu.zip")},
        {"tf-tools-x86_64-linux",TF("tessesframework-tools-x86_64-linux-musl.tar.gz")},
        {"tf-tools-x86_64-macos",TF("tessesframework-tools-x86_64-macos-none.tar.gz")},
        {"tf-tools-x86_64-windows",TF("tessesframework-tools-x86_64-windows-gnu.zip")},
        {"cl-slim-aarch64-linux-musl", CL("crosslang-slim-aarch64-linux-musl")},
        {"cl-slim-aarch64-macos-none", CL("crosslang-slim-aarch64-macos-none")},
        {"cl-slim-aarch64-windows-gnu", CL("crosslang-slim-aarch64-windows-gnu.exe")},
        {"cl-slim-arm-linux-musleabi", CL("crosslang-slim-arm-linux-musleabi")},
        {"cl-slim-powerpc-linux-musleabihf", CL("crosslang-slim-powerpc-linux-musleabihf")},
        {"cl-slim-riscv64-linux-musl", CL("crosslang-slim-riscv64-linux-musl")},
        {"cl-slim-x86-linux-musl", CL("crosslang-slim-x86-linux-musl")},
        {"cl-slim-x86-windows-gnu", CL("crosslang-slim-x86-windows-gnu.exe")},
        {"cl-slim-x86_64-linux-musl", CL("crosslang-slim-x86_64-linux-musl")},
        {"cl-slim-x86_64-macos-none", CL("crosslang-slim-x86_64-macos-none")},
        {"cl-slim-x86_64-windows-gnu", CL("crosslang-slim-x86_64-windows-gnu.exe")},
        
        
        
    };

    private static IRedirect Std(string url)
    {
        return new StdRedirect(url);
    }
    private static IRedirect Gitea(string giteaServer, string giteaProject, string file, bool prerelease = false)
    {
        return new GiteaReleaseRedirect(giteaServer,giteaProject,file,prerelease);
    }
    private static IRedirect TF(string filename)
    {
        return Gitea(
            "https://git.tesses.org/",
            "tesses50/tessesframework",
            filename,
            true
        );
    }
    private static IRedirect CL(string filename)
    {
        return Gitea(
            "https://git.tesses.org/",
            "tesses50/crosslang",
            filename,
            true
        );
    }

    public static async Task<string?> HandleRedirectAsync(string redir)
    {
        if(redirects.ContainsKey(redir))
            return await redirects[redir].RedirectAsync();
        return null;
    }
}

interface IRedirect
{
    public Task<string?> RedirectAsync();
}

public class StdRedirect(string url) : IRedirect
{
    public async Task<string?> RedirectAsync()
    {
        return await Task.FromResult(url);
    }
}
public class GiteaReleaseRedirect(string giteaServer, string giteaProject, string file, bool prerelease = false) : IRedirect
{
    private static HttpClient client =new HttpClient();
    public async Task<string?> RedirectAsync()
    {
        // https://git.tesseslanguage.com/api/v1/repos/tesses50/crosslang/releases?pre-release=true&limit=1
        var resp = await client.GetFromJsonAsync<List<_release>>($"{giteaServer.TrimEnd('/')}/api/v1/repos/{System.Web.HttpUtility.UrlPathEncode(giteaProject)}/releases?pre-release={(prerelease ? "true":"false")}&limit=1");
        if(resp is not null)
        {
            var resp2 = resp.FirstOrDefault();
            if(resp2 is not null)
            {
                foreach(var item in resp2.Assets)
                {
                    if(item.Name == file)
                        return item.Url;
                }
            }
        }
        return null;
    }

    private class _release
    {
        [JsonPropertyName("assets")]        
        public List<_asset> Assets {get;set;}=new List<_asset>();


        public class _asset
        {
            [JsonPropertyName("name")]
            public string Name {get;set;}="";

            [JsonPropertyName("browser_download_url")] 
            public string Url {get;set;}="";
        }
    }
}