'use strict';

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

const template = views.getTemplate('post-readonly-sidebar');
const scoreTemplate = views.getTemplate('score');
const favTemplate = views.getTemplate('fav');

class PostReadonlySidebarControl extends events.EventTarget {
    constructor(hostNode, post, postContentControl) {
        super();
        this._hostNode = hostNode;
        this._post = post;
        this._postContentControl = postContentControl;

        post.addEventListener('changeFavorite', e => this._evtChangeFav(e));
        post.addEventListener('changeScore', e => this._evtChangeScore(e));

        views.replaceContent(this._hostNode, template({
            post: this._post,
            enableSafety: api.safetyEnabled(),
            canListPosts: api.hasPrivilege('posts:list'),
            canEditPosts: api.hasPrivilege('posts:edit'),
            canViewTags: api.hasPrivilege('tags:view'),
        }));

        this._installFav();
        this._installScore();
        this._installFitButtons();
        this._syncFitButton();
    }

    get _scoreContainerNode() {
        return this._hostNode.querySelector('.score-container');
    }

    get _favContainerNode() {
        return this._hostNode.querySelector('.fav-container');
    }

    get _upvoteButtonNode() {
        return this._hostNode.querySelector('.upvote');
    }

    get _downvoteButtonNode() {
        return this._hostNode.querySelector('.downvote');
    }

    get _addFavButtonNode() {
        return this._hostNode.querySelector('.add-favorite');
    }

    get _remFavButtonNode() {
        return this._hostNode.querySelector('.remove-favorite');
    }

    get _fitBothButtonNode() {
        return this._hostNode.querySelector('.fit-both');
    }

    get _fitOriginalButtonNode() {
        return this._hostNode.querySelector('.fit-original');
    }

    get _fitWidthButtonNode() {
        return this._hostNode.querySelector('.fit-width');
    }

    get _fitHeightButtonNode() {
        return this._hostNode.querySelector('.fit-height');
    }

    _installFitButtons() {
        this._fitBothButtonNode.addEventListener(
            'click', this._eventZoomProxy(
                () => this._postContentControl.fitBoth()));
        this._fitOriginalButtonNode.addEventListener(
            'click', this._eventZoomProxy(
                () => this._postContentControl.fitOriginal()));
        this._fitWidthButtonNode.addEventListener(
            'click', this._eventZoomProxy(
                () => this._postContentControl.fitWidth()));
        this._fitHeightButtonNode.addEventListener(
            'click', this._eventZoomProxy(
                () => this._postContentControl.fitHeight()));
    }

    _installFav() {
        views.replaceContent(
            this._favContainerNode,
            favTemplate({
                favoriteCount: this._post.favoriteCount,
                ownFavorite: this._post.ownFavorite,
                canFavorite: api.hasPrivilege('posts:favorite'),
            }));

        if (this._addFavButtonNode) {
            this._addFavButtonNode.addEventListener(
                'click', e => this._evtAddToFavoritesClick(e));
        }
        if (this._remFavButtonNode) {
            this._remFavButtonNode.addEventListener(
                'click', e => this._evtRemoveFromFavoritesClick(e));
        }
    }

    _installScore() {
        views.replaceContent(
            this._scoreContainerNode,
            scoreTemplate({
                score: this._post.score,
                ownScore: this._post.ownScore,
                canScore: api.hasPrivilege('posts:score'),
            }));
        if (this._upvoteButtonNode) {
            this._upvoteButtonNode.addEventListener(
                'click', e => this._evtScoreClick(e, 1));
        }
        if (this._downvoteButtonNode) {
            this._downvoteButtonNode.addEventListener(
                'click', e => this._evtScoreClick(e, -1));
        }
    }

    _eventZoomProxy(func) {
        return e => {
            e.preventDefault();
            e.target.blur();
            func();
            this._syncFitButton();
            this.dispatchEvent(new CustomEvent('fitModeChange', {
                detail: {
                    mode: this._getFitMode(),
                },
            }));
        };
    }

    _getFitMode() {
        const funcToName = {};
        funcToName[this._postContentControl.fitBoth] = 'fit-both';
        funcToName[this._postContentControl.fitOriginal] = 'fit-original';
        funcToName[this._postContentControl.fitWidth] = 'fit-width';
        funcToName[this._postContentControl.fitHeight] = 'fit-height';
        return funcToName[this._postContentControl._currentFitFunction];
    }

    _syncFitButton() {
        const className = this._getFitMode();
        const oldNode = this._hostNode.querySelector('.zoom a.active');
        const newNode = this._hostNode.querySelector(`.zoom a.${className}`);
        if (oldNode) {
            oldNode.classList.remove('active');
        }
        newNode.classList.add('active');
    }

    _evtAddToFavoritesClick(e) {
        e.preventDefault();
        this.dispatchEvent(new CustomEvent('favorite', {
            detail: {
                post: this._post,
            },
        }));
    }

    _evtRemoveFromFavoritesClick(e) {
        e.preventDefault();
        this.dispatchEvent(new CustomEvent('unfavorite', {
            detail: {
                post: this._post,
            },
        }));
    }

    _evtScoreClick(e, score) {
        e.preventDefault();
        this.dispatchEvent(new CustomEvent('score', {
            detail: {
                post: this._post,
                score: this._post.ownScore === score ? 0 : score,
            },
        }));
    }

    _evtChangeFav(e) {
        this._installFav();
    }

    _evtChangeScore(e) {
        this._installScore();
    }
};

module.exports = PostReadonlySidebarControl;
