using Fluxor;
using Koogle.Application.DTOs;
using Koogle.Application.Interfaces;
using Koogle.Infrastructure.Identity;
using Koogle.Web.Store.AuthState;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;

namespace Koogle.Web.Controllers
{
    /// <summary>
    /// Controller für Authentifizierungsaktionen (Login, Logout)
    /// </summary>
    /// <remarks>
    /// UserManagerService nutzt SignInManager der wiederum nicht in einer SignalR methode funktioniert.
    /// Aus dem Grund werden Login/Logout Aktionen hier im MVC Controller mit einem "normalen" Post-Request abgewickelt.
    /// </remarks>
    [Microsoft.AspNetCore.Mvc.Route("auth")]
    public class AuthController(IDispatcher dispatcher, IUserService userService) : Controller
    {
        private readonly IDispatcher _dispatcher = dispatcher;
        private readonly IUserService _userService = userService;


        [HttpPost("login")]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Login(
            [FromForm] LoginDto input)
        {
            var returnUrl = string.IsNullOrWhiteSpace(input.ReturnUrl) ? "/" : input.ReturnUrl;

            var user = await _userService.LoginAsync(input);
            if (user != null)
            {
                return LocalRedirect(returnUrl);
            }
            return LocalRedirect("/account/login?error=true");
        }


        [HttpPost("logout")]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Logout([FromForm] string? returnUrl = null)
        {
            await _userService.SignOutAsync();

            _dispatcher.Dispatch(new LogoutCompleteAction());

            // Nach Logout per Redirect neu laden (neuer Request -> neue Auth-Session)
            returnUrl ??= "/account/login";
            return LocalRedirect(returnUrl);
        }

        /// <summary>
        /// Handles user registration via form POST.
        /// </summary>
        [HttpPost("register")]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Register([FromForm] RegisterUserDto input)
        {
            var result = await _userService.RegisterUserAsync(input);
            if (result.Succeeded)
            {
                // If invite token was provided, redirect to join page
                if (!string.IsNullOrWhiteSpace(input.InviteToken))
                {
                    return LocalRedirect($"/account/login?registered=true&invite={Uri.EscapeDataString(input.InviteToken)}");
                }
                return LocalRedirect("/account/login?registered=true");
            }

            // Build error string from IdentityResult
            var errors = string.Join(",", result.Errors.Select(e => e.Code));
            var inviteParam = !string.IsNullOrWhiteSpace(input.InviteToken)
                ? $"&invite={Uri.EscapeDataString(input.InviteToken)}"
                : "";
            return LocalRedirect($"/account/register?error={errors}{inviteParam}");
        }

        /// <summary>
        /// Handles password reset request (forgot password).
        /// </summary>
        [HttpPost("forgot-password")]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> ForgotPassword([FromForm] string email)
        {
            // Always show success to prevent email enumeration
            var token = await _userService.RequestPasswordResetAsync(email);

            if (token != null)
            {
                // TODO: Send email with reset link
                // For now, log the token for development purposes
                var resetUrl = $"/account/reset-password?email={Uri.EscapeDataString(email)}&token={Uri.EscapeDataString(token)}";
                Console.WriteLine($"[DEV] Password reset link: {resetUrl}");
            }

            return LocalRedirect("/account/forgot-password?success=true");
        }

        /// <summary>
        /// Handles password reset with token.
        /// </summary>
        [HttpPost("reset-password")]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> ResetPassword([FromForm] ResetPasswordFormDto input)
        {
            // Validate password confirmation
            if (input.NewPassword != input.ConfirmPassword)
            {
                return LocalRedirect($"/account/reset-password?email={Uri.EscapeDataString(input.Email)}&token={Uri.EscapeDataString(input.Token)}&error=PasswordMismatch");
            }

            var dto = new ResetPasswordDto
            {
                Email = input.Email,
                Token = input.Token,
                NewPassword = input.NewPassword
            };

            var result = await _userService.ResetPasswordAsync(dto);
            if (result.Succeeded)
            {
                return LocalRedirect("/account/reset-password?success=true");
            }

            var errors = string.Join(",", result.Errors.Select(e => e.Code));
            return LocalRedirect($"/account/reset-password?email={Uri.EscapeDataString(input.Email)}&token={Uri.EscapeDataString(input.Token)}&error={errors}");
        }
    }


}