using System.IO;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using Newtonsoft.Json;

namespace Azaion.LoaderUI;

public interface IAzaionApi
{
    void Login(ApiCredentials credentials);
    Task<string> GetLastInstallerName(string folder);
    Task<(string name, Stream stream)> DownloadInstaller(string folder);
}

public class AzaionApi(HttpClient client) : IAzaionApi
{
    private string _jwtToken = null!;
    const string APP_JSON = "application/json";
    private ApiCredentials _credentials = null!;

    public void Login(ApiCredentials credentials)
    {
        _credentials = credentials;
    }

    public async Task<string> GetLastInstallerName(string folder)
    {
        var res = await Get<List<string>>($"/resources/list/{folder}");
        return res?.FirstOrDefault() ?? "";
    }

    public async Task<(string name, Stream stream)> DownloadInstaller(string folder)
    {
        var response = await Send(new HttpRequestMessage(HttpMethod.Get, $"resources/get-installer/{folder}"));
        var fileStream = await response.Content.ReadAsStreamAsync();
        var fileName = response.Content.Headers.ContentDisposition?.FileName?.Trim('"') ?? "installer.exe";
        return (fileName, fileStream);
    }

    private async Task<HttpResponseMessage> Send(HttpRequestMessage request)
    {
        if (string.IsNullOrEmpty(_jwtToken))
            await Authorize();
        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", _jwtToken);
        var response = await client.SendAsync(request);

        if (response.StatusCode == HttpStatusCode.Unauthorized)
        {
            await Authorize();
            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", _jwtToken);
            response = await client.SendAsync(request);
        }

        if (response.IsSuccessStatusCode)
            return response;

        var stream = await response.Content.ReadAsStreamAsync();
        var content = await new StreamReader(stream).ReadToEndAsync();
        if (response.StatusCode == HttpStatusCode.Conflict)
        {
            var result = JsonConvert.DeserializeObject<BusinessExceptionDto>(content);
            throw new Exception($"Failed: {response.StatusCode}! Error Code: {result?.ErrorCode}. Message: {result?.Message}");
        }
        throw new Exception($"Failed: {response.StatusCode}! Result: {content}");
    }

    private async Task<T?> Get<T>(string url)
    {
        var response = await Send(new HttpRequestMessage(HttpMethod.Get, url));
        var stream = await response.Content.ReadAsStreamAsync();
        var json = await new StreamReader(stream).ReadToEndAsync();
        return JsonConvert.DeserializeObject<T>(json);
    }

    private async Task Put<T>(string url, T obj)
    {
        await Send(new HttpRequestMessage(HttpMethod.Put, url)
        {
            Content = new StringContent(JsonConvert.SerializeObject(obj), Encoding.UTF8, APP_JSON)
        });
    }

    private async Task Authorize()
    {
        try
        {
            if (string.IsNullOrEmpty(_credentials.Email) || _credentials.Password.Length == 0)
                throw new Exception("Email or password is empty! Please do EnterCredentials first!");

            var content = new StringContent(JsonConvert.SerializeObject(new
            {
                email = _credentials.Email,
                password = _credentials.Password
            }), Encoding.UTF8, APP_JSON);
            var message = new HttpRequestMessage(HttpMethod.Post, "login") { Content = content };
            var response = await client.SendAsync(message);

            if (!response.IsSuccessStatusCode)
                throw new Exception($"EnterCredentials failed: {response.StatusCode}");

            var stream = await response.Content.ReadAsStreamAsync();
            var json = await new StreamReader(stream).ReadToEndAsync();
            var result = JsonConvert.DeserializeObject<LoginResponse>(json);

            if (string.IsNullOrEmpty(result?.Token))
                throw new Exception("JWT Token not found in response");

            _jwtToken = result.Token;
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
            throw;
        }
    }
}