import * as argon2 from "argon2";
import { IsEmail, IsOptional, IsPhoneNumber, IsString } from 'class-validator';
import { getConnectionManager } from 'typeorm';
import * as uuid from 'uuid';
import { UsernameOrEmailNeededError } from '../../errors/UserErrors';
import { UserGroupNotFoundError } from '../../errors/UserGroupErrors';
import { User } from '../entities/User';
import { UserGroup } from '../entities/UserGroup';

export class CreateUser {
    /**
     * The new user's first name.
     */
    @IsString()
    firstname: string;

    /**
     * The new user's middle name.
     * Optinal.
     */
    @IsString()
    @IsOptional()
    middlename?: string;

    /**
     * The new user's last name.
     */
    @IsString()
    lastname: string;

    /**
     * The new user's username.
     * You have to provide at least one of: {email, username}.
     */
    @IsOptional()
    @IsString()
    username?: string;

    /**
     * The new user's email address.
     * You have to provide at least one of: {email, username}.
     */
    @IsEmail()
    @IsString()
    @IsOptional()
    email?: string;

    /**
     * The new user's phone number.
     * Optional
     */
    @IsPhoneNumber("ZZ")
    @IsOptional()
    phone?: string;

    /**
     * The new user's password.
     * This will of course not be saved in plaintext :)
     */
    @IsString()
    password: string;

    /**
     * The new user's groups' id(s).
     * You can provide either one groupId or an array of groupIDs.
     * Optional.
     */
    @IsOptional()
    groupId?: number[] | number

    //TODO: ProfilePics

    /**
     * Converts this to a User Entity.
     */
    public async toUser(): Promise<User> {
        let newUser: User = new User();

        if (this.email === undefined && this.username === undefined) {
            throw new UsernameOrEmailNeededError();
        }

        if (this.groupId) {
            if (!Array.isArray(this.groupId)) {
                this.groupId = [this.groupId]
            }
            const groupIDs: number[] = this.groupId
            let errors = 0
            const validateusergroups = async () => {
                let foundgroups = []
                for (const g of groupIDs) {
                    const found = await getConnectionManager().get().getRepository(UserGroup).find({ id: g });
                    if (found.length === 0) {
                        errors++
                    } else {
                        foundgroups.push(found[0])
                    }
                }
                newUser.groups = foundgroups
            }
            await validateusergroups()
            if (errors !== 0) {
                throw new UserGroupNotFoundError();
            }
        }

        newUser.email = this.email
        newUser.username = this.username
        newUser.firstname = this.firstname
        newUser.middlename = this.middlename
        newUser.lastname = this.lastname
        newUser.uuid = uuid.v4()
        newUser.phone = this.phone
        newUser.password = await argon2.hash(this.password + newUser.uuid);
        //TODO: ProfilePics

        return newUser;
    }
}