using System.Diagnostics.CodeAnalysis;
using JetBrains.Annotations;
using LBPUnion.ProjectLighthouse.Configuration;
using LBPUnion.ProjectLighthouse.Extensions;
using LBPUnion.ProjectLighthouse.Helpers;
using LBPUnion.ProjectLighthouse.PlayerData;
using LBPUnion.ProjectLighthouse.PlayerData.Profiles;
using LBPUnion.ProjectLighthouse.Servers.Website.Pages.Layouts;
using LBPUnion.ProjectLighthouse.Types;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace LBPUnion.ProjectLighthouse.Servers.Website.Pages;

public class RegisterForm : BaseLayout
{
    public RegisterForm(Database database) : base(database)
    { }

    public string? Error { get; private set; }

    [UsedImplicitly]
    [SuppressMessage("ReSharper", "SpecifyStringComparison")]
    public async Task<IActionResult> OnPost(string username, string password, string confirmPassword, string emailAddress)
    {
        if (ServerConfiguration.Instance.Authentication.PrivateRegistration)
        {
            if (this.Request.Query.ContainsKey("token"))
            {
                if (!this.Database.IsRegistrationTokenValid(this.Request.Query["token"]))
                    return this.StatusCode(403, "Invalid Token");
            }
            else
            {
                return this.NotFound();
            }
        }
        else if (!ServerConfiguration.Instance.Authentication.RegistrationEnabled)
        {
            return this.NotFound();
        }

        if (string.IsNullOrWhiteSpace(username))
        {
            this.Error = "The username field is blank.";
            return this.Page();
        }

        if (string.IsNullOrWhiteSpace(password))
        {
            this.Error = "Password field is required.";
            return this.Page();
        }

        if (string.IsNullOrWhiteSpace(emailAddress) && ServerConfiguration.Instance.Mail.MailEnabled)
        {
            this.Error = "Email address field is required.";
            return this.Page();
        }

        if (password != confirmPassword)
        {
            this.Error = "Passwords do not match!";
            return this.Page();
        }

        if (await this.Database.Users.FirstOrDefaultAsync(u => u.Username.ToLower() == username.ToLower()) != null)
        {
            this.Error = "The username you've chosen is already taken.";
            return this.Page();
        }

        if (ServerConfiguration.Instance.Mail.MailEnabled &&
            await this.Database.Users.FirstOrDefaultAsync(u => u.EmailAddress != null && u.EmailAddress.ToLower() == emailAddress.ToLower()) != null)
        {
            this.Error = "The email address you've chosen is already taken.";
            return this.Page();
        }

        if (!await this.Request.CheckCaptchaValidity())
        {
            this.Error = "You must complete the captcha correctly.";
            return this.Page();
        }

        if (this.Request.Query.ContainsKey("token"))
        {
            await Database.RemoveRegistrationToken(this.Request.Query["token"]);
        }

        User user = await this.Database.CreateUser(username, CryptoHelper.BCryptHash(password), emailAddress);

        WebToken webToken = new()
        {
            UserId = user.UserId,
            UserToken = CryptoHelper.GenerateAuthToken(),
        };

        this.Database.WebTokens.Add(webToken);
        await this.Database.SaveChangesAsync();

        this.Response.Cookies.Append("LighthouseToken", webToken.UserToken);

        if (ServerConfiguration.Instance.Mail.MailEnabled) return this.Redirect("~/login/sendVerificationEmail");

        return this.RedirectToPage(nameof(LandingPage));
    }

    [UsedImplicitly]
    [SuppressMessage("ReSharper", "SpecifyStringComparison")]
    public IActionResult OnGet()
    {
        this.Error = string.Empty;
        if (ServerConfiguration.Instance.Authentication.PrivateRegistration)
        {
            if (this.Request.Query.ContainsKey("token"))
            {
                if (!this.Database.IsRegistrationTokenValid(this.Request.Query["token"]))
                    return this.StatusCode(403, "Invalid Token");
            }
            else
            {
                return this.NotFound();
            }
        }
        else if (!ServerConfiguration.Instance.Authentication.RegistrationEnabled)
        {
            return this.NotFound();
        }

        return this.Page();
    }
}