import { crypt, sha1, randomStr } from "../utils/CryptUtils";
import { APIClient } from "../entities/APIClient";
import { UserLoginTokens } from "../entities/UserLoginTokens";
import { DatabaseHelper } from "./DatabaseHelper";
import { UserHelper } from "./UserHelper";
import { time, mysql_date } from "../utils/DateUtils";
import { NewAccount } from "../entities/NewAccount";
import { GeneralSettings, UserPageStatus, LangSettings, SecuritySettings } from "../entities/User";
import { AccountExport } from "../entities/AccountExport";
import { PostsHelper } from "./PostsHelper";
import { CommentsHelper } from "./CommentsHelper";
import { LikesHelper, LikesType } from "./LikesHelper";
import { SurveyHelper } from "./SurveyHelper";
import { MoviesHelper } from "./MoviesHelper";
import { ConversationsHelper } from "./ConversationsHelper";
import { FriendsHelper } from "./FriendsHelper";
import { GroupsHelper } from "./GroupsHelper";
import { NotificationsHelper } from "./NotificationsHelper";
import { AccountImageHelper } from "./AccountImageHelper";
import { BackgroundImageHelper } from "./BackgroundImageHelper";
import { EventsHelper } from "./EventsHelper";

/**
 * Account helper
 * 
 * @author Pierre HUBERT
 */

export const USER_TABLE = "utilisateurs";
const USERS_TOKENS_TABLE = "comunic_api_users_tokens";

export class AccountHelper {

	/**
	 * Create a new account
	 * 
	 * @param info Information about the new account
	 */
	public static async Create(info: NewAccount) {
		const data = {
			nom: info.lastName,
			prenom: info.firstName,
			date_creation: mysql_date(),
			mail: info.email,
			password: this.CryptPassword(info.password)
		};

		await DatabaseHelper.InsertRow(USER_TABLE, data);
	}

	/**
	 * Given email address and password, try to sign in user
	 * 
	 * @param email The email of the user
	 * @param password User password
	 * @param client Information about associated client / null if none found
	 */
	static async LoginUser(email: string, password: string, client: APIClient) : Promise<UserLoginTokens | null> {
		
		// Perform a request on the database
		const row = await DatabaseHelper.QueryRow({
			table: USER_TABLE,
			fields: ["ID"],
			where: {
				mail: email,
				password: this.CryptPassword(password)
			}
		});

		// Check if user was found
		if(row == null)
			return null;
		const userID = row.ID;

		// Check for existing tokens
		let tokens = await this.GetClientTokens(userID, client);

		if(tokens != null)
			return tokens;
		
		const newTokens : UserLoginTokens = {
			userID: userID,
			clientID: client.id,
			token1: randomStr(150),
			token2: "dummy_data"
		}

		// Save new tokens
		await DatabaseHelper.InsertRow(USERS_TOKENS_TABLE, {
			user_id: newTokens.userID,
			service_id: newTokens.clientID,
			token1: newTokens.token1,
			token2: newTokens.token2
		});

		return newTokens;
	}

	/**
	 * Get user client tokens (if it exists)
	 * 
	 * @param userID Target user ID
	 * @param client Information about associated client / null if none found
	 */
	private static async GetClientTokens(userID: number, client: APIClient): Promise<UserLoginTokens | null> {
		const row = await DatabaseHelper.QueryRow({
			table: USERS_TOKENS_TABLE,
			where: {
				user_id: userID,
				service_id: client.id
			}
		});

		return row == null ? null : this.DBToUserTokens(row);
	}

	/**
	 * Find a user using its tokens
	 * 
	 * @param client Information about the client
	 * @param token1 First token
	 * @param token2 Second token
	 * @returns The ID of the target user / -1 if none found
	 */
	public static async GetUserIdFromTokens(client : APIClient, 
		token1: string, token2: string) : Promise<number> {

		const row = await DatabaseHelper.QueryRow({
			table: USERS_TOKENS_TABLE,
			fields: ["user_id"],
			where: {
				service_id: client.id,
				token1: token1,
				token2: token2
			}
		});

		if(!row)
			return -1;
		
		return Number(row.user_id);
	}

	/**
	 * Destroy user tokens
	 * 
	 * @param client Information about the client
	 * @param userID Target user ID
	 */
	public static async DestroyUserTokens(client: APIClient, userID: number) {

		// Push the event
		EventsHelper.Emit("destroyed_login_tokens", {
			client: client,
			userID: userID
		});

		return DatabaseHelper.DeleteRows(USERS_TOKENS_TABLE, {
			service_id: client.id,
			user_id: userID
		});
	}


	/**
	 * Check out whether the password of a user is valid
	 * or not
	 * 
	 * @param userID Target user ID
	 * @param password Target password
	 */
	public static async CheckUserPassword(userID: number, password: string) : Promise<boolean> {
		const crypt_pass = this.CryptPassword(password);

		return await DatabaseHelper.Count({
			table: USER_TABLE,
			where: {
				ID: userID,
				password: crypt_pass
			}
		}) > 0;
	}

	/**
	 * Crypt a password
	 * 
	 * @param pass The password to crypt
	 * @return Encrypted string
	 */
	private static CryptPassword(pass: string) : string {
		return crypt(sha1(pass), sha1(pass));
	}


	private static DBToUserTokens(row : any) : UserLoginTokens {
		return {
			userID: row.user_id,
			clientID: row.service_id,
			token1: row.token1,
			token2: row.token2
		};
	}

	/**
	 * Check out whether an email address exists or not
	 * 
	 * @param email Email address to check
	 */
	public static async ExistsEmail(email: string) : Promise<boolean> {
		return await DatabaseHelper.Count({
			table: USER_TABLE,
			where: {
				mail: email
			}
		}) > 0;
	}

	/**
	 * Find user ID from its email address
	 * 
	 * @param email Email address
	 * @returns The ID of the matching user / -1 if none found
	 */
	public static async FindIDFromEmail(email: string) : Promise<number> {
		const result = await DatabaseHelper.QueryRow({
			table: USER_TABLE,
			where: {
				mail: email,
			},
			fields: ["ID"]
		});

		return result == null ? -1 : result.ID;
	}

	/**
	 * Update the last activity time of the user
	 * 
	 * @param userID Target user ID
	 */
	public static async UpdateLastActivity(userID: number) {
		await DatabaseHelper.UpdateRows({
			table: USER_TABLE,
			where: {
				ID: userID
			},
			set: {
				last_activity: time()
			}
		})
	}


	/**
	 * Check out whether a virtual directory is available or not
	 * 
	 * @param dir Virtual directory to check
	 * @param userID Target user ID
	 */
	public static async CheckUserDirectoryAvailability(dir: string, userID: number = -1) : Promise<boolean> {
		const foundUser = await UserHelper.FindByFolder(dir);

		return foundUser < 1 || userID == foundUser;
	}

	/**
	 * Generate a new token to reset an account password
	 * 
	 * @param userID Target user ID
	 * @returns Generated token
	 */
	public static async GenerateNewPasswordResetToken(userID: number) : Promise<string> {
		
		// Generate a token
		const token = randomStr(255);

		await DatabaseHelper.UpdateRows({
			table: USER_TABLE,
			where: {
				ID: userID
			},
			set: {
				password_reset_token: token,
				password_reset_token_time_create: time()
			}
		});

		return token;
	}

	/**
	 * Destroy password reset token for a given user
	 * 
	 * @param userID Target user ID
	 */
	public static async DestroyPasswordResetTokenForUser(userID: number) {
		await DatabaseHelper.UpdateRows({
			table: USER_TABLE,
			where: {
				ID: userID
			},
			set: {
				password_reset_token: "",
				password_reset_token_time_create: 85 // Value too low to be valid
			}
		});
	}

	/**
	 * Delete all user login tokens
	 * 
	 * This method has for immediate effect to disconnect
	 * the user from all its devices
	 * 
	 * @param userID Target user ID
	 */
	public static async DeleteAllUserLoginTokens(userID: number) {
		await DatabaseHelper.DeleteRows(USERS_TOKENS_TABLE, {
			user_id: userID
		})
	}

	/**
	 * Get the ID of a user from a password reset token
	 * 
	 * @param token The token to use
	 * @returns The ID of the user associated to the token, if it is valid / -1 else
	 */
	public static async GetUserIDFromPasswordResetToken(token: string) : Promise<number> {
		
		// Query the database
		const result = await DatabaseHelper.QueryRow({
			table: USER_TABLE,
			where: {
				password_reset_token: token,
			},
			customWhere: "password_reset_token_time_create > ?",
			customWhereArgs:[(time()-60*60*24).toString()] // Tokens are valid for 24 hours
		});

		if(result == null)
			return -1;

		return result.ID;
	}

	/**
	 * Change the password of the user
	 * 
	 * @param userID Target user ID
	 * @param password Target password
	 */
	public static async ChangePassword(userID: number, password: string) {
		await DatabaseHelper.UpdateRows({
			table: USER_TABLE,
			where: {
				ID: userID
			},
			set: {
				password: this.CryptPassword(password)
			}
		});
	}

	/**
	 * Set (save) new general settings
	 * 
	 * @param settings New settings
	 */
	public static async SetGeneral(settings: GeneralSettings) {
		await DatabaseHelper.UpdateRows({
			table: USER_TABLE,
			where: {
				ID: settings.id
			},
			set: {
				prenom: settings.firstName,
				nom: settings.lastName,
				public: settings.pageStatus != UserPageStatus.PRIVATE ? 1 : 0,
				pageouverte: settings.pageStatus == UserPageStatus.OPEN ? 1 : 0,
				bloquecommentaire: settings.blockComments ? 1 : 0,
				autoriser_post_amis: settings.allowPostsFromFriends ? 1 : 0,
				autorise_mail: settings.allowMails ? 1 : 0,
				liste_amis_publique: settings.friendsListPublic ? 1 : 0,
				sous_repertoire: settings.virtualDirectory,
				site_web: settings.personnalWebsite,
				public_note: settings.publicNote
			}
		});
	}

	/**
	 * Set (save) new language settings
	 * 
	 * @param settings New settings
	 */
	public static async SetLanguageSettings(settings: LangSettings) {
		await DatabaseHelper.UpdateRows({
			table: USER_TABLE,
			where: {
				ID: settings.id
			},
			set: {
				lang: settings.lang
			}
		});
	}

	/**
	 * Update (set) new security settings
	 * 
	 * @param settings New settings
	 */
	public static async SetSecuritySettings(settings: SecuritySettings) {
		await DatabaseHelper.UpdateRows({
			table: USER_TABLE,
			where: {
				ID: settings.id
			},
			set: {
				question1: settings.security_question_1,
				reponse1: settings.security_answer_1,
				question2: settings.security_question_2,
				reponse2: settings.security_answer_2
			}
		});
	}

	/**
	 * Export all the data of an account
	 * 
	 * @param userID Target user ID
	 */
	public static async Export(userID: number) : Promise<AccountExport> {
		const data = new AccountExport({
			// General info
			userID: userID,
			userInfo: await UserHelper.GetUserInfo(userID),

			// Export the list of posts
			postsList: await PostsHelper.ExportAllPostsUser(userID),

			// Export the list of comments
			comments: await CommentsHelper.ExportAllUser(userID),

			// Export user likes
			likes: await LikesHelper.ExportAllUser(userID),

			// Export all responses of user to surveys
			surveyResponses: await SurveyHelper.ExportAllUserResponses(userID),

			// User movies
			movies: await MoviesHelper.GetListUser(userID),

			// Conversation messages
			allConversationMessages: await ConversationsHelper.ExportAllMessages(userID),

			// Conversations list
			conversations: await ConversationsHelper.GetListUser(userID),

			// Conversations messages (completed after)
			conversationsMessages: new Map(),

			// Friends
			friendsList: await FriendsHelper.GetList(userID),

			// Groups membership
			groups: await GroupsHelper.GetListUser(userID),
		})

		// Process conversation messages
		for(const conv of data.conversations) {
			data.conversationsMessages[conv.id]
				= await ConversationsHelper.GetAllMessages(conv.id);
		}

		return data;
	}

	/**
	 * Remove completely a user account
	 * 
	 * @param userID Target user ID
	 */
	public static async Delete(userID: number) {

		/*// Delete all groups memberships
		await GroupsHelper.DeleteAllUsersGroups(userID);
		
		// Delete all user comments
		await CommentsHelper.DeleteAllUser(userID);
		
		// Delete all user posts
		await PostsHelper.DeleteAllUser(userID);
		
		// Delete all responses of user to surveys
		await SurveyHelper.DeleteAllUserResponses(userID);
		
		// Delete all the likes created by the user
		await LikesHelper.DeleteAllUser(userID);
		
		// Delete all user movies
		await MoviesHelper.DeleteAllUser(userID);
		
		// Delete conversation messages
		await ConversationsHelper.DeleteAllUserMessages(userID);
		
		// Remove the user from all its conversations
		await ConversationsHelper.DeleteAllUserConversations(userID);
		
		// Delete all the notifications related with the user
		await NotificationsHelper.DeleteAllRelatedWithUser(userID);
		
		// Delete all user friends, including friendship requests
		await FriendsHelper.DeleteAllUser(userID);
		
		// Delete user account image
		await AccountImageHelper.Delete(userID);
		
		// Delete all the likes on the user page
		await LikesHelper.DeleteAll(userID, LikesType.USER);
		
		// Delete user background image
		await BackgroundImageHelper.Delete(userID);

		// TODO : Delete custom user emojies
		
		// Delete connections to all services
		await this.DeleteAllUserLoginTokens(userID);
		*/

		// Delete user from the database
		// WILL BE IMPLEMENTED LATER
	}
}