'use strict';

const api = require('../api.js');
const uri = require('../util/uri.js');
const events = require('../events.js');

class User extends events.EventTarget {
    constructor() {
        super();
        this._orig = {};
        this._updateFromResponse({});
    }

    get name() {
        return this._name;
    }

    get rank() {
        return this._rank;
    }

    get email() {
        return this._email;
    }

    get avatarStyle() {
        return this._avatarStyle;
    }

    get avatarUrl() {
        return this._avatarUrl;
    }

    get creationTime() {
        return this._creationTime;
    }

    get lastLoginTime() {
        return this._lastLoginTime;
    }

    get commentCount() {
        return this._commentCount;
    }

    get favoritePostCount() {
        return this._favoritePostCount;
    }

    get uploadedPostCount() {
        return this._uploadedPostCount;
    }

    get likedPostCount() {
        return this._likedPostCount;
    }

    get dislikedPostCount() {
        return this._dislikedPostCount;
    }

    get rankName() {
        return api.rankNames.get(this.rank);
    }

    get avatarContent() {
        throw 'Invalid operation';
    }

    get password() {
        throw 'Invalid operation';
    }

    set name(value) {
        this._name = value;
    }

    set rank(value) {
        this._rank = value;
    }

    set email(value) {
        this._email = value || null;
    }

    set avatarStyle(value) {
        this._avatarStyle = value;
    }

    set avatarContent(value) {
        this._avatarContent = value;
    }

    set password(value) {
        this._password = value;
    }

    static fromResponse(response) {
        const ret = new User();
        ret._updateFromResponse(response);
        return ret;
    }

    static get(name) {
        return api.get(uri.formatApiLink('user', name))
            .then(response => {
                return Promise.resolve(User.fromResponse(response));
            });
    }

    save() {
        const files = [];
        const detail = {version: this._version};
        const transient = this._orig._name;

        if (this._name !== this._orig._name) {
            detail.name = this._name;
        }
        if (this._email !== this._orig._email) {
            detail.email = this._email;
        }
        if (this._rank !== this._orig._rank) {
            detail.rank = this._rank;
        }
        if (this._avatarStyle !== this._orig._avatarStyle) {
            detail.avatarStyle = this._avatarStyle;
        }
        if (this._avatarContent) {
            detail.avatarStyle = this._avatarStyle;
            files.avatar = this._avatarContent;
        }
        if (this._password) {
            detail.password = this._password;
        }

        let promise = this._orig._name ?
            api.put(
                uri.formatApiLink('user', this._orig._name), detail, files) :
            api.post(uri.formatApiLink('users'), detail, files);

        return promise
            .then(response => {
                this._updateFromResponse(response);
                this.dispatchEvent(new CustomEvent('change', {
                    detail: {
                        user: this,
                    },
                }));
                return Promise.resolve();
            });
    }

    delete() {
        return api.delete(
            uri.formatApiLink('user', this._orig._name),
            {version: this._version})
            .then(response => {
                this.dispatchEvent(new CustomEvent('delete', {
                    detail: {
                        user: this,
                    },
                }));
                return Promise.resolve();
            });
    }

    _updateFromResponse(response) {
        const map = {
            _version: response.version,
            _name: response.name,
            _rank: response.rank,
            _email: response.email,
            _avatarStyle: response.avatarStyle,
            _avatarUrl: response.avatarUrl,
            _creationTime: response.creationTime,
            _lastLoginTime: response.lastLoginTime,
            _commentCount: response.commentCount,
            _favoritePostCount: response.favoritePostCount,
            _uploadedPostCount: response.uploadedPostCount,
            _likedPostCount: response.likedPostCount,
            _dislikedPostCount: response.dislikedPostCount,
        };

        Object.assign(this, map);
        Object.assign(this._orig, map);

        this._password = null;
        this._avatarContent = null;
    }
}

module.exports = User;