using Emberend.Database;
using Emberend.Helpers;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using System.Security.Claims;
using System.Text.Json;

namespace Emberend.Endpoints;

public static class UserAccess
{
    public static void MapUserAccessEndpoints(this IEndpointRouteBuilder routes)
    {
        MapPostLogin(routes);
        MapPostRegister(routes);
        MapPostLogout(routes);


        MapGetUserById(routes);
    }

    private static void MapPostLogin(IEndpointRouteBuilder routes)
    {
        routes.MapPost("/login", async (LoginDto dto, AppDbContext db, HttpContext context) =>
        {
            var user = await db.Users
                .AsNoTracking()
                .FirstOrDefaultAsync(u => u.Email == dto.Email);

            if (user is null)
            {
                context.Response.StatusCode = 401;
                await context.Response.WriteAsync("");
                return;
            }

            var hash = PasswordHasher.Hash(dto.Password, user.Salt);
            

            var claims = new[]
            {
                new Claim(ClaimTypes.NameIdentifier, user.Id),
                new Claim(ClaimTypes.Email, user.Email)
            };

            var identity = new ClaimsIdentity(claims, "auth");
            await context.SignInAsync("auth", new ClaimsPrincipal(identity));


            var loginResponse = new
            {
                user.Id,
                user.Email,
                user.Name,
                user.ProfilePicture
            };

            context.Response.ContentType = "application/json";
            context.Response.StatusCode = 200;

            await context.Response.WriteAsync(JsonSerializer.Serialize(loginResponse));
            return;
        });
    }

    private static void MapPostRegister(IEndpointRouteBuilder routes)
    {
        routes.MapPost("/register", async (HttpContext context, RegisterDto dto, AppDbContext db) =>
        {
            if (dto.Password.Length < 6)
            {
                context.Response.StatusCode = 400;
                return;
            }
                
            if (await db.Users.AsNoTracking().AnyAsync(u => u.Email == dto.Email))
            {
                context.Response.StatusCode = 409;
                return;
            }

            var salt = PasswordHasher.NewSalt();
            var hash = PasswordHasher.Hash(dto.Password, salt);

            var user = new User
            {
                Id = Guid.NewGuid().ToString(),
                Email = dto.Email,
                Name = "",
                PasswordHash = hash,
                Salt = salt,
                ProfilePicture = ""
            };

            db.Users.Add(user);
            await db.SaveChangesAsync();

            context.Response.ContentType = "application/json";
            context.Response.StatusCode = 200;
            return;
        });
    }


    private static void MapPostLogout(IEndpointRouteBuilder routes)
    {
        routes.MapPost("/logout", async (HttpContext context) =>
        {
            await context.SignOutAsync("auth");

            context.Response.StatusCode = 200;
            await context.Response.WriteAsync("");
        });
    }



    private static void MapGetUserById(IEndpointRouteBuilder routes)
    {
        routes.MapGet("/user/{id}", async context =>
        {
            var id = context.Request.RouteValues["id"];
            //Dodaj null check ^

            await context.Response.WriteAsync($"User: {id}");
        });
    }
}