using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using T120B165_ImgBoard.Dtos;
using T120B165_ImgBoard.Models;
using T120B165_ImgBoard.Services;

namespace T120B165_ImgBoard.Controllers;


[ApiController]
[Route("api/auth")]
public class AuthController(UserManager<User> userManager, ITokenService tokenService): ControllerBase
{

    /// <summary>
    /// Creates a new user account.
    /// </summary>
    /// <param name="dto">Registration data</param>
    /// <response code="200">Returns user data</response>
    /// <response code="400">If user supplied credentials fail validation</response>
    [HttpPost("register")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
    public async Task<ActionResult<SlimUserDto>> Register(RegisterDto dto)
    {
        var user = new User
        {
            UserName = dto.UserName,
            Email = dto.Email,
        };
        
        var result = await userManager.CreateAsync(user, dto.Password);
        await userManager.AddToRoleAsync(user, UserRoles.Regular);

        Dictionary<string, object> idk = new()
        {
            ["errors"] = result.Errors
        };

        if (!result.Succeeded)
        {
            return Problem(
                statusCode: StatusCodes.Status422UnprocessableEntity,
                extensions: idk
            );
        }
        return Ok(SlimUserDto.FromUser(user));
    }

    /// <summary>
    /// Authenticates and creates a pair of access and refresh tokens.
    /// </summary>
    /// <param name="dto">Data with refresh token</param>
    /// <response code="200">Returns refresh and access tokens</response>
    /// <response code="401">If the credentials are incorrect</response>
    [HttpPost("login")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
    public async Task<ActionResult<TokenDto>> Login(LoginDto dto)
    {
        var user = await userManager.FindByEmailAsync(dto.Email);
        if (user == null || !await userManager.CheckPasswordAsync(user, dto.Password))
            return Unauthorized();

        var accessToken = await tokenService.GenerateJwtToken(user);
        var refreshToken = await tokenService.GenerateRefreshToken(user);
        return Ok(new TokenDto(AccessToken: accessToken, RefreshToken: refreshToken));
    }

    /// <summary>
    /// Consume refresh token to create new access and refresh tokens.
    /// </summary>
    /// <param name="dto">Data with refresh token</param>
    /// <response code="200">Returns new refresh and access tokens</response>
    /// <response code="401">If refresh token is missing or is expired</response>
    [HttpPost("refresh")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
    public async Task<ActionResult<TokenDto>> Refresh(RefreshDto dto)
    {
        var token =  await tokenService.GetRefreshTokenByValue(dto.RefreshToken);
        if (token == null) return Unauthorized();
        var user = token.User;
        
        await tokenService.InvalidateRefreshToken(token);
        
        var accessToken = await tokenService.GenerateJwtToken(user);
        var newRefreshToken = await tokenService.GenerateRefreshToken(user);
        return Ok(new TokenDto(AccessToken: accessToken, RefreshToken: newRefreshToken));
    }
    
    /// <summary>
    /// Revokes the refresh token.
    /// </summary>
    /// <param name="dto">Data with refresh token</param>
    /// <response code="204">If token was revoked successfully</response>
    /// <response code="401">If refresh token is missing or is expired</response>
    [HttpPost("revoke")]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
    public async Task<ActionResult<TokenDto>> Revoke(RefreshDto dto)
    {
        var token =  await tokenService.GetRefreshTokenByValue(dto.RefreshToken);
        if (token == null) return Unauthorized();
        
        await tokenService.InvalidateRefreshToken(token);
        return NoContent();
    }
}