using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Localization;
using Microsoft.Extensions.Options;

using PrivaPub.ClientModels;
using PrivaPub.ClientModels.Resources;
using PrivaPub.ClientModels.Group;
using PrivaPub.ClientModels.User;
using PrivaPub.ClientModels.User.Avatar;
using PrivaPub.Extensions;
using PrivaPub.Federation.Actors;
using PrivaPub.Models;
using PrivaPub.Models.User;
using PrivaPub.Resources;
using PrivaPub.Services;
using PrivaPub.Services.ClientToServer.Private;
using PrivaPub.StaticServices;

using System.ComponentModel.DataAnnotations;

namespace PrivaPub.Controllers.ClientToServer
{
	[ApiController,
		Route("clientapi/user")]
	public class RootUserController : ControllerBase
	{
		readonly IRootUsersService UsersService;
		readonly IGroupUsersService GroupUsersService;
		readonly IPrivateAvatarUsersService AvatarUsersService;
		readonly ILocalActorService LocalActors;
		readonly AuthTokenManager AuthTokenManager;
		readonly IOptionsMonitor<AppConfiguration> AppConfiguration;
		readonly ILogger<RootUserController> Logger;
		readonly IStringLocalizer Localizer;

		public RootUserController(IRootUsersService usersService,
				IGroupUsersService groupUsersService,
				IPrivateAvatarUsersService avatarUsersService,
				ILocalActorService localActors,
				AuthTokenManager authTokenManager,
				IOptionsMonitor<AppConfiguration> appConfiguration,
				IStringLocalizer<GenericRes> localizer,
				ILogger<RootUserController> logger)
		{
			UsersService = usersService;
			GroupUsersService = groupUsersService;
			AvatarUsersService = avatarUsersService;
			LocalActors = localActors;
			AuthTokenManager = authTokenManager;
			AppConfiguration = appConfiguration;
			Localizer = localizer;
			Logger = logger;
		}

		#region User endpoints

		[HttpPost, Route("/clientapi/user/signup"), Authorize(Policy = Policies.IsUser), AllowAnonymous]
		public async Task<IActionResult> SignUp(LoginForm signUpForm)
		{
			if (User.Identity?.IsAuthenticated ?? false) return Redirect("/");
			var result = new WebResult();
			if (!ModelState.IsValid)
				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
			try
			{
				result = await UsersService.SignUpAsync(signUpForm);
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);

				(var user, var userSettings) = ((RootUser, ViewUserSettings))result.Data;
				var jwtUser = AuthTokenManager.GenerateToken(user, userSettings);
				return Ok(jwtUser);
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(SignUp)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		[HttpPost, Route("/clientapi/user/login"), Authorize(Policy = Policies.IsUser), AllowAnonymous]
		public async Task<IActionResult> Login(LoginForm loginForm)
		{
			if (User.Identity?.IsAuthenticated ?? false) return Redirect("/discussions");
			var result = new WebResult();
			if (!ModelState.IsValid)
				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
			try
			{
				result = await UsersService.LoginAsync(loginForm);
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);

				var (user, userSettings) =
						((RootUser, ViewUserSettings))result.Data;
				var jwtUser = AuthTokenManager.GenerateToken(user, userSettings);

				return Ok(jwtUser);
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(Login)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		[HttpPost, Route("/clientapi/user/invitation/signup"), AllowAnonymous]
		public async Task<IActionResult> InvitationSignUp(InvitationLoginForm signUpForm, CancellationToken token)
		{
			var result = new WebResult();
			if (!ModelState.IsValid)
				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
			try
			{
				var invitation = await GroupUsersService.GetInvitation(signUpForm.InvitationCode, signUpForm.InvitationPassword, token);
				if (!invitation.IsValid)
					return StatusCode(invitation.StatusCode, invitation);

				var avatarUserName = signUpForm.AvatarUserName?.Trim().ToLowerInvariant();
				var personaProblem = await PersonaProblem(avatarUserName, signUpForm.UserName, token);
				if (personaProblem != default)
					return BadRequest(result.Invalidate(personaProblem));

				result = await UsersService.SignUpAsync(signUpForm, signUpForm.InvitationCode);
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);
				var (user, userSettings) = ((RootUser, ViewUserSettings))result.Data;

				var avatar = await AvatarUsersService.InsertAvatar(new InsertAvatarForm
				{
					RootId = user.ID,
					Name = string.IsNullOrWhiteSpace(signUpForm.AvatarName) ? avatarUserName : signUpForm.AvatarName.Trim(),
					UserName = avatarUserName,
					Biography = string.Empty
				});
				if (!avatar.IsValid)
					return StatusCode(avatar.StatusCode, avatar);

				var joined = await GroupUsersService.JoinGroup(user.ID, new JoinGroupForm
				{
					AvatarId = ((ViewAvatar)avatar.Data).Id,
					InvitationCode = signUpForm.InvitationCode,
					InvitationPassword = signUpForm.InvitationPassword
				}, token);
				if (!joined.IsValid)
					return StatusCode(joined.StatusCode, joined);

				return Ok(AuthTokenManager.GenerateToken(user, userSettings));
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(InvitationSignUp)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		[HttpPost, Route("/clientapi/user/invitation/login"), AllowAnonymous]
		public async Task<IActionResult> InvitationLogin(InvitationLoginForm loginForm, CancellationToken token)
		{
			var result = new WebResult();
			if (!ModelState.IsValid)
				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
			try
			{
				var invitation = await GroupUsersService.GetInvitation(loginForm.InvitationCode, loginForm.InvitationPassword, token);
				if (!invitation.IsValid)
					return StatusCode(invitation.StatusCode, invitation);

				result = await UsersService.LoginAsync(loginForm, loginForm.InvitationCode);
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);
				var (user, userSettings) = ((RootUser, ViewUserSettings))result.Data;

				var avatars = await AvatarUsersService.GetRootAvatars(user.ID, token);
				var avatarUserName = loginForm.AvatarUserName?.Trim().ToLowerInvariant();
				var avatar = string.IsNullOrEmpty(avatarUserName)
					? (avatars.Data as List<ViewAvatar>)?.FirstOrDefault()
					: (avatars.Data as List<ViewAvatar>)?.FirstOrDefault(a => a.UserName == avatarUserName);
				if (avatar == default)
				{
					var personaProblem = await PersonaProblem(avatarUserName, user.UserName, token);
					if (personaProblem != default)
						return BadRequest(new WebResult().Invalidate(personaProblem));
					var inserted = await AvatarUsersService.InsertAvatar(new InsertAvatarForm
					{
						RootId = user.ID,
						Name = string.IsNullOrWhiteSpace(loginForm.AvatarName) ? avatarUserName : loginForm.AvatarName.Trim(),
						UserName = avatarUserName,
						Biography = string.Empty
					});
					if (!inserted.IsValid)
						return StatusCode(inserted.StatusCode, inserted);
					avatar = (ViewAvatar)inserted.Data;
				}

				var joined = await GroupUsersService.JoinGroup(user.ID, new JoinGroupForm
				{
					AvatarId = avatar.Id,
					InvitationCode = loginForm.InvitationCode,
					InvitationPassword = loginForm.InvitationPassword
				}, token);
				if (!joined.IsValid)
					return StatusCode(joined.StatusCode, joined);

				return Ok(AuthTokenManager.GenerateToken(user, userSettings));
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(InvitationLogin)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		async Task<string> PersonaProblem(string avatarUserName, string rootUserName, CancellationToken token)
		{
			if (string.IsNullOrEmpty(avatarUserName))
				return Localizer["Choose a username for your persona."];
			if (string.Equals(avatarUserName, rootUserName?.Trim(), StringComparison.OrdinalIgnoreCase))
				return Localizer["Your persona's username must differ from your login."];
			if (await LocalActors.IsUserNameTaken(avatarUserName, token))
				return Localizer["The username '{0}' is already take.", avatarUserName];
			return default;
		}

		[HttpGet, Route("/clientapi/user/logout"), Authorize(Policy = Policies.IsUser)]
		public IActionResult Logout()
		{
			var result = new WebResult();
			try
			{
				return Ok();
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(Logout)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		[HttpPost, Route("/clientapi/user/update"), Authorize(Policy = Policies.IsUser)]
		public async Task<IActionResult> UpdateUser(UserForm userEmailForm)
		{
			var result = new WebResult();
			if (!ModelState.IsValid)
				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
			try
			{
				result = await UsersService.UpdateUserAsync(userEmailForm, User.GetUserId());
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);

				return Ok();
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(UpdateUser)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		[HttpPost, Route("/clientapi/user/update/settings"), Authorize(Policy = Policies.IsUser)]
		public async Task<IActionResult> UpdateUserSettings(ViewUserSettings userSettings)
		{
			var result = new WebResult();
			if (!ModelState.IsValid)
				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
			try
			{
				result = await UsersService.UpdateUserSettingsAsync(userSettings, User.GetUserId());
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);

				return Ok();
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(UpdateUserSettings)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		[HttpPost, Route("/clientapi/user/update/password"), Authorize(Policy = Policies.IsUser)]
		public async Task<IActionResult> UpdatePassword(UserPasswordForm userPasswordForm)
		{
			var result = new WebResult();
			if (!ModelState.IsValid)
				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
			try
			{
				result = await UsersService.UpdateUserPasswordAsync(userPasswordForm, User.GetUserId());
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);

				return Ok();
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(UpdatePassword)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		//[HttpGet, Authorize(Policy = Policies.IsUser)]
		//public async Task<IActionResult> GetUser()
		//{
		//	var result = new WebResult();
		//	try
		//	{
		//		result = await UsersService.GetUserAsync(User.GetUserId());
		//		if (!result.IsValid)
		//			return StatusCode(result.StatusCode, result);

		//		return Ok(result.Data);
		//	}
		//	catch (Exception ex)
		//	{
		//		Logger.LogError(ex, $"{nameof(User)}.{nameof(GetUser)}()");
		//		return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
		//	}
		//}

		[HttpGet, Route("/clientapi/user/settings"), Authorize(Policy = Policies.IsUser)]
		public async Task<IActionResult> GetUserSettings()
		{
			var result = new WebResult();
			try
			{
				result = await UsersService.GetUserSettingsAsync(User.GetUserId());
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);
				return Ok(result.Data);
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(GetUserSettings)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		[HttpPost, Route("/clientapi/user/recover/password"), AllowAnonymous]
		public async Task<IActionResult> RecoverPassword(PasswordRecoveryForm passwordRecoveryForm)
		{
			var result = new WebResult();
			if (!ModelState.IsValid)
				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
			try
			{
				var host = string.IsNullOrEmpty(AppConfiguration.CurrentValue.FrontendBaseAddress)
					? $"{Request.Scheme}://{Request.Host.Host}"
					: AppConfiguration.CurrentValue.FrontendBaseAddress.TrimEnd('/');
				result = await UsersService.SetupAndSendRecoveryEmail(passwordRecoveryForm, host);
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);

				return Ok(result);
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(RecoverPassword)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		[HttpPost, Route("/clientapi/user/recover/valid"), AllowAnonymous]
		public async Task<IActionResult> IsValidRecoveryCode(
				[FromBody,
						 Required(ErrorMessageResourceName = "Required", ErrorMessageResourceType = typeof(ErrorsResource)),
						 Display(Name = "RecoveryCode", ResourceType = typeof(FieldsNameResource))]
						string recoveryCode)
		{
			var result = new WebResult();
			try
			{
				result = await UsersService.IsValidRecoveryCode(recoveryCode);
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);

				return Ok(result.Data);
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(IsValidRecoveryCode)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		[HttpPost, Route("/clientapi/user/recover/update/password"), AllowAnonymous]
		public async Task<IActionResult> ChangePassword(NewPasswordForm newPasswordForm)
		{
			var result = new WebResult();
			if (!ModelState.IsValid)
				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
			try
			{
				result = await UsersService.ChangePassword(newPasswordForm);
				if (!result.IsValid)
					return StatusCode(result.StatusCode, result);

				return Ok(result.Data);
			}
			catch (Exception ex)
			{
				Logger.LogError(ex, $"{nameof(User)}.{nameof(ChangePassword)}()");
				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
			}
		}

		//[HttpDelete, Route("delete"), Authorize(Policy = Policies.IsUser)]
		//public async Task<IActionResult> RemoveSelf()
		//{
		//	var result = new WebResult();
		//	try
		//	{
		//		//result = await UsersService.RemoveUserAsync(User.GetUserId());
		//		if (!result.IsValid)
		//			return StatusCode(result.StatusCode, result);

		//		await HttpContext.SignOutAsync();

		//		return Ok();
		//	}
		//	catch (Exception ex)
		//	{
		//		Logger.LogError(ex, $"{nameof(User)}.{nameof(RemoveSelf)}()");
		//		return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
		//	}
		//}

		#endregion User endpoints

		#region Auth refresh

		[HttpGet, Route("/clientapi/user/sniff/again"), Authorize(Policy = Policies.IsUser)]
		public async Task<IActionResult> SniffAgain()
		{

			return Ok();
		}

		#endregion
	}
}