using System.Web;
using Foxnouns.Backend.Database;
using Foxnouns.Backend.Extensions;
using Foxnouns.Backend.Middleware;
using Foxnouns.Backend.Services;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Newtonsoft.Json;
using NodaTime;

namespace Foxnouns.Backend.Controllers.Authentication;

[Route("/api/internal/auth")]
public class AuthController(
    Config config,
    DatabaseContext db,
    KeyCacheService keyCache,
    ILogger logger
) : ApiControllerBase
{
    private readonly ILogger _logger = logger.ForContext<AuthController>();

    [HttpPost("urls")]
    [ProducesResponseType<UrlsResponse>(StatusCodes.Status200OK)]
    public async Task<IActionResult> UrlsAsync(CancellationToken ct = default)
    {
        _logger.Debug(
            "Generating auth URLs for Discord: {Discord}, Google: {Google}, Tumblr: {Tumblr}",
            config.DiscordAuth.Enabled,
            config.GoogleAuth.Enabled,
            config.TumblrAuth.Enabled
        );
        var state = HttpUtility.UrlEncode(await keyCache.GenerateAuthStateAsync(ct));
        string? discord = null;
        if (config.DiscordAuth is { ClientId: not null, ClientSecret: not null })
            discord =
                $"https://discord.com/oauth2/authorize?response_type=code"
                + $"&client_id={config.DiscordAuth.ClientId}&scope=identify"
                + $"&prompt=none&state={state}"
                + $"&redirect_uri={HttpUtility.UrlEncode($"{config.BaseUrl}/auth/callback/discord")}";

        return Ok(new UrlsResponse(config.EmailAuth.Enabled, discord, null, null));
    }

    private record UrlsResponse(bool EmailEnabled, string? Discord, string? Google, string? Tumblr);

    public record AuthResponse(
        UserRendererService.UserResponse User,
        string Token,
        Instant ExpiresAt
    );

    public record OauthRegisterRequest(string Ticket, string Username);

    public record CallbackRequest(string Code, string State);

    [HttpPost("force-log-out")]
    [Authorize("identify")]
    public async Task<IActionResult> ForceLogoutAsync()
    {
        _logger.Information("Invalidating all tokens for user {UserId}", CurrentUser!.Id);
        await db
            .Tokens.Where(t => t.UserId == CurrentUser.Id)
            .ExecuteUpdateAsync(s => s.SetProperty(t => t.ManuallyExpired, true));

        return NoContent();
    }
}

public record CallbackResponse(
    bool HasAccount,
    [property: JsonProperty(NullValueHandling = NullValueHandling.Ignore)] string? Ticket,
    [property: JsonProperty(NullValueHandling = NullValueHandling.Ignore)] string? RemoteUsername,
    [property: JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
        UserRendererService.UserResponse? User,
    [property: JsonProperty(NullValueHandling = NullValueHandling.Ignore)] string? Token,
    [property: JsonProperty(NullValueHandling = NullValueHandling.Ignore)] Instant? ExpiresAt
);