using System.Net;
using System.Net.Http;
using System.Net.Http.Json;

namespace EnvelopeGenerator.Server.Client.Services;

public enum EnvelopeLoginResult { Success, InvalidCode, NotFound, Error }

public enum SenderLoginResult { Success, InvalidCredentials, Error }

public class AuthService(IHttpClientFactory httpClientFactory)
{

    /// <summary>
    /// Checks whether the current user holds a valid receiver token for the given envelope key.
    /// Calls GET /api/auth/check/envelope/{envelopeKey}.
    /// </summary>
    public async Task<bool> CheckEnvelopeAccessAsync(string envelopeKey, CancellationToken cancel = default)
    {
        using var http = httpClientFactory.CreateClient("EnvelopeGenerator.Server");
        var response = await http.GetAsync($"/api/auth/check/envelope/{Uri.EscapeDataString(envelopeKey)}", cancel);
        return response.StatusCode == HttpStatusCode.OK;
    }

    /// <summary>
    /// Submits the access code for the given envelope key.
    /// Calls POST /api/Auth/envelope-receiver/{key} with multipart/form-data.
    /// On success the API sets an authentication cookie automatically.
    /// </summary>
    public async Task<EnvelopeLoginResult> LoginEnvelopeReceiverAsync(string envelopeKey, string accessCode, CancellationToken cancel = default)
    {
        using var http = httpClientFactory.CreateClient("EnvelopeGenerator.Server");
        var form = new MultipartFormDataContent();
        form.Add(new StringContent(accessCode), "AccessCode");

        var response = await http.PostAsync(
            $"/api/Auth/envelope-receiver/{Uri.EscapeDataString(envelopeKey)}",
            form, cancel);

        return response.StatusCode switch
        {
            HttpStatusCode.OK => EnvelopeLoginResult.Success,
            HttpStatusCode.Unauthorized => EnvelopeLoginResult.InvalidCode,
            HttpStatusCode.NotFound => EnvelopeLoginResult.NotFound,
            _ => EnvelopeLoginResult.Error
        };
    }

    /// <summary>
    /// Removes the per-envelope receiver cookie for the given envelope key.
    /// Calls POST /api/auth/logout/envelope/{envelopeKey}.
    /// </summary>
    public async Task<bool> LogoutEnvelopeReceiverAsync(string envelopeKey, CancellationToken cancel = default)
    {
        using var http = httpClientFactory.CreateClient("EnvelopeGenerator.Server");
        var response = await http.PostAsync(
            $"/api/auth/logout/envelope/{Uri.EscapeDataString(envelopeKey)}",
            null, cancel);
        return response.IsSuccessStatusCode;
    }

    /// <summary>
    /// Authenticates a sender user with username and password.
    /// Calls POST /api/auth?cookie=true with JSON body.
    /// On success the API sets an authentication cookie automatically.
    /// </summary>
    public async Task<SenderLoginResult> LoginSenderAsync(string username, string password, CancellationToken cancel = default)
    {
        using var http = httpClientFactory.CreateClient("EnvelopeGenerator.Server");
        var requestBody = new { username, password };

        var response = await http.PostAsJsonAsync(
            $"/api/auth?cookie=true",
            requestBody, cancel);

        return response.StatusCode switch
        {
            HttpStatusCode.OK => SenderLoginResult.Success,
            HttpStatusCode.Unauthorized => SenderLoginResult.InvalidCredentials,
            _ => SenderLoginResult.Error
        };
    }
}