import { RequestHandler } from "../entities/RequestHandler";
import { AccountHelper } from "../helpers/AccountHelper";
import { UserHelper } from "../helpers/UserHelper";
import { NewAccount } from "../entities/NewAccount";
import { removeHTMLNodes } from "../utils/StringUtils";
import { limit_query } from "./APILimitsController";
import { Action } from "../helpers/APILimitsHelper";
import { UserController } from "./UserController";
import { PostsController } from "./PostsController";
import { CommentsController } from "./CommentsController";

/**
 * Account controller
 * 
 * @author Pierre HUBERT
 */

export class AccountController {

	/**
	 * Create a new account
	 * 
	 * @param h Request handler
	 */
	public static async Create(h: RequestHandler) {
		// Limit request
		await limit_query(h, Action.CREATE_ACCOUNT, false);

		// Get & check email address
		const email = h.postEmail("emailAddress");
		if(await AccountHelper.ExistsEmail(email))
			h.error(409, "This email address already belongs to an account!");

		const newAccount = <NewAccount>{
			firstName: removeHTMLNodes(h.postString("firstName")),
			lastName: removeHTMLNodes(h.postString("lastName")),
			email: email,
			password: h.postString("password", 3)
		};

		// Try to create the account
		await AccountHelper.Create(newAccount);

		// Trigger the API limit
		await limit_query(h, Action.CREATE_ACCOUNT, true);

		// Success
		h.success("The account has been created!");
	}

	/**
	 * Attempt to login user
	 * 
	 * @param h Request handler
	 */
	public static async LoginUser(h: RequestHandler) {

		// Get post data
		const email = h.postEmail("userMail");
		const password = h.postString("userPassword");

		// Limit request
		await limit_query(h, Action.LOGIN_FAILED, false);

		// Authenticate user
		const tokens = await AccountHelper.LoginUser(email, password, h.getClientInfo());

		if(tokens == null) {
			// Trigger limit
			await limit_query(h, Action.LOGIN_FAILED, true);

			h.error(401, "Invalid e-mail address / password !");
		}

		// Success
		h.send({
			success: "User signed in!",
			tokens: {
				token1: tokens.token1,
				token2: tokens.token2
			}
		});
	}

	/**
	 * Disconnect user
	 * 
	 * @param handler 
	 */
	public static async LogoutUser(handler: RequestHandler) {

		await AccountHelper.DestroyUserTokens(handler.getClientInfo(), 
			handler.getUserId());

		handler.success("User has been disconnected!");
	}

	/**
	 * Get current user ID
	 * 
	 * @param handler
	 */
	public static CurrentUserID(handler: RequestHandler) {
		handler.send({
			userID: handler.getUserId()
		});
	}

	/**
	 * Check out whether an email is associated to an account
	 * or not
	 * 
	 * @param h Request handler
	 */
	public static async ExistsMail(h: RequestHandler) {
		const email = h.postEmail("email");

		h.send({
			exists: await AccountHelper.ExistsEmail(email)
		})
	}

	/**
	 * Check if an account associated with an email address has
	 * setup security questions or not
	 * 
	 * @param h Request handler
	 */
	public static async HasSecurityQuestions(h: RequestHandler) {
		const userID = await h.postUserIdFromEmail("email");
		const settings = await UserHelper.GetUserInfo(userID);

		h.send({
			defined: settings.hasSecurityQuestions
		})
	}

	/**
	 * Get the security questions of a user, in order to reset its
	 * password
	 * 
	 * @param h Request handler
	 */
	public static async GetSecurityQuestions(h: RequestHandler) {
		const userID = await h.postUserIdFromEmail("email");
		const settings = await UserHelper.GetUserInfo(userID);

		if(!settings.hasSecurityQuestions)
			h.error(401, "Specified user has not setup security questions !");
		
		h.send({
			questions: [
				settings.security_question_1,
				settings.security_question_2
			]
		})
	}

	/**
	 * Check the answer given by the user
	 * 
	 * @param h Request handler
	 */
	public static async CheckSecurityAnswers(h: RequestHandler) {
		const userID = await h.postUserIdFromEmail("email");
		const settings = await UserHelper.GetUserInfo(userID);

		if(!settings.hasSecurityQuestions)
			h.error(401, "Specified user has not setup security questions !");
		
		// Get the answers of the user
		const answers = h.postString("answers", 3).split("&")
			.map((e) => decodeURIComponent(e).toLowerCase().trim());

		if(answers.length != 2)
			h.error(401, "Please specify two security answers !");
		
		// Check the answers
		if(answers[0] != settings.security_answer_1.toLowerCase().trim() ||
			answers[1] != settings.security_answer_2.toLowerCase().trim())
			h.error(401, "Specified ecurity answers are invalid!");

		// If we get there, security answers are valid, we can create a password reset token
		h.send({
			reset_token: await AccountHelper.GenerateNewPasswordResetToken(userID)
		});
	}

	/**
	 * Check the validity of a password reset Token
	 * 
	 * @param h Request handler
	 */
	public static async CheckPasswordResetToken(h: RequestHandler) {
		// We just get user ID to check the validity of the token
		await this.GetUserIDFromPasswordResetToken(h, "token");
		h.success("The token is valid.");
	}

	/**
	 * Reset user password
	 * 
	 * @param h Request handler
	 */
	public static async ResetUserPassword(h: RequestHandler) {
		const userID = await this.GetUserIDFromPasswordResetToken(h, "token");
		const newPassword = h.postString("password", 3);

		// Set new password
		await AccountHelper.ChangePassword(userID, newPassword);

		// Destroy reset token
		await AccountHelper.DestroyPasswordResetTokenForUser(userID);

		h.success("Password changed!");
	}

	/**
	 * Export the data of the user
	 * 
	 * @param h Request handler
	 */
	public static async ExportData(h: RequestHandler) {
		await h.needUserPostPassword("password");

		// Query the database
		const data = await AccountHelper.Export(h.getUserId());
		
		const out: any = {
			userID: data.userID,

			// General account information
			advanced_info: await UserController.UserToAPI(data.userInfo, h, true),

			// User posts
			posts: await Promise.all(data.postsList.map((p) => PostsController.PostToAPI(h, p))),

			// User comments
			comments: await CommentsController.CommentsToAPI(h, data.comments),
		};



		// TODO : continue (additional user info)


		h.send(out);
	}

	/**
	 * Delete a user account
	 * 
	 * @param h Request handler
	 */
	public static async DeleteAccount(h: RequestHandler) {
		await h.needUserPostPassword("password");

		// TODO : implement
		h.error(500, "Method not implemented yet.");
	}

	/**
	 * Get the user ID associated to a password reset token
	 * 
	 * @param h Request handler
	 * @param name The name of the POST field containing the token
	 */
	private static async GetUserIDFromPasswordResetToken(h: RequestHandler, name: string) : Promise<number> {
		const token = h.postString(name, 10);
		const userID = await AccountHelper.GetUserIDFromPasswordResetToken(token);

		if(userID < 1)
			h.error(401, "Invalid password reset token!");
		
		return userID;
	}
}