using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.IdentityModel.Tokens;
using SecureNotesApi.Contracts;
using SecureNotesApi.Models;

namespace SecureNotesApi.Controllers;

[ApiController]
[Route("[controller]")]
public class AuthController : ControllerBase
{
    private readonly UserManager<ApplicationUser> _users;
    private readonly IConfiguration _config;

    public AuthController(UserManager<ApplicationUser> users, IConfiguration config)
    {
        _users = users;
        _config = config;
    }

    [HttpPost("register")]
    public async Task<IActionResult> Register(RegisterRequest req)
    {
        var user = new ApplicationUser { UserName = req.Email, Email = req.Email };
        var result = await _users.CreateAsync(user, req.Password);
        if (!result.Succeeded)
            return BadRequest(result.Errors);

        return Ok(new { message = "Пользователь создан" });
    }

    [HttpPost("login")]
    public async Task<ActionResult<AuthResponse>> Login(LoginRequest req)
    {
        var user = await _users.FindByEmailAsync(req.Email);
        if (user is null || !await _users.CheckPasswordAsync(user, req.Password))
            return Unauthorized();

        var token = await CreateTokenAsync(user);
        var jwt = _config.GetSection("Jwt");
        var expire = DateTime.UtcNow.AddMinutes(int.Parse(jwt["ExpireMinutes"]!));

        return new AuthResponse(token, expire);
    }

    private async Task<string> CreateTokenAsync(ApplicationUser user)
    {
        var jwt = _config.GetSection("Jwt");
        var roles = await _users.GetRolesAsync(user);

        var claims = new List<Claim>
        {
            new(ClaimTypes.NameIdentifier, user.Id),
            new(ClaimTypes.Email, user.Email ?? user.UserName ?? "")
        };
        claims.AddRange(roles.Select(r => new Claim(ClaimTypes.Role, r)));

        var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(jwt["Key"]!));
        var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

        var token = new JwtSecurityToken(
            issuer: jwt["Issuer"],
            audience: jwt["Audience"],
            claims: claims,
            expires: DateTime.UtcNow.AddMinutes(int.Parse(jwt["ExpireMinutes"]!)),
            signingCredentials: creds);

        return new JwtSecurityTokenHandler().WriteToken(token);
    }
}