using System.Text.Json.Serialization;
using OptixServe.Core.Services;
using OptixServe.Api.Dtos;
using OptixServe.Api.Services;
using Microsoft.AspNetCore.Authorization;

namespace OptixServe.Api.Endpoints;


[JsonSerializable(typeof(UserDto))]
[JsonSerializable(typeof(IEnumerable<UserDto>))]
[JsonSerializable(typeof(LoginRequestDto))]
[JsonSerializable(typeof(LoginResponseDto))] // For returning the token string
public partial class UserJsonContext : JsonSerializerContext { }

public static class UserEndpoint
{
    public static void Register(RouteGroupBuilder parentGroup)
    {
        var group = parentGroup.MapGroup("/users");

        group.MapPost("/login", LoginUser);
        group.MapGet("/", GetAllUsers).RequireAuthorization();
        group.MapGet("/{id}", GetUserById).RequireAuthorization();
    }

    public static IResult LoginUser(LoginRequestDto loginRequest, IUserService userService, ITokenService tokenService)
    {
        if (string.IsNullOrEmpty(loginRequest.UserName) || string.IsNullOrEmpty(loginRequest.Password))
        {
            return Results.BadRequest("Username and password are required.");
        }

        // Password hashing and salting will be implemented later.
        var user = userService.GetUserByUsername(loginRequest.UserName);

        if (user == null || user.Password != loginRequest.Password)
        {
            return Results.Unauthorized();
        }

        var token = tokenService.GenerateToken(user);
        return Results.Ok(new LoginResponseDto { Token = token });
    }

    public static IResult GetAllUsers(IUserService userService)
    {
        var users = userService.GetUsers()
            .Select(u => new UserDto { Id = u.Id, UserName = u.UserName });
        return Results.Ok(users);
    }

    public static IResult GetUserById(string id, IUserService userService)
    {
        var user = userService.GetUserById(id);
        if (user == null)
            return Results.NotFound();

        return Results.Ok(new UserDto { Id = user.Id, UserName = user.UserName });
    }
}