<template>
    <div id="app">
        <div id="main" tabindex="0" v-show="authenticated"
            @keydown.space="togglePlayback"
            @keydown.j = "playNext"
            @keydown.k = "playPrev"
            @keydown.f = "search"
            @keydown.177 = "playPrev"
            @keydown.176 = "playNext"
            @keydown.179 = "togglePlayback"
        >
            <site-header></site-header>
            <main-wrapper></main-wrapper>
            <site-footer></site-footer>
            <overlay ref="overlay"></overlay>
            <edit-songs-form ref="editSongsForm"></edit-songs-form>
        </div>

        <div class="login-wrapper" v-if="!authenticated">
            <login-form></login-form>
        </div>
    </div>
</template>

<script>
    import Vue from 'vue';
    import $ from 'jquery';

    import siteHeader from './components/site-header/index.vue';
    import siteFooter from './components/site-footer/index.vue';
    import mainWrapper from './components/main-wrapper/index.vue';
    import overlay from './components/shared/overlay.vue';
    import loginForm from './components/auth/login-form.vue';
    import editSongsForm from './components/modals/edit-songs-form.vue';

    import sharedStore from './stores/shared';
    import queueStore from './stores/queue';
    import songStore from './stores/song';
    import userStore from './stores/user';
    import preferences from './stores/preference';
    import playback from './services/playback';
    import focusDirective from './directives/focus';
    import ls from './services/ls';
    import { event, showOverlay, hideOverlay, loadMainView, forceReloadWindow } from './utils';

    export default {
        components: { siteHeader, siteFooter, mainWrapper, overlay, loginForm, editSongsForm },

        data() {
            return {
                authenticated: false,
            };
        },

        mounted() {
            // The app has just been initialized, check if we can get the user data with an already existing token
            const token = ls.get('jwt-token');
            if (token) {
                this.authenticated = true;
                this.init();
            }

            // Create the element to be the ghost drag image.
            $('<div id="dragGhost"></div>').appendTo('body');

            // Add an ugly mac/non-mac class for OS-targeting styles.
            // I'm crying inside.
            $('html').addClass(navigator.userAgent.indexOf('Mac') !== -1 ? 'mac' : 'non-mac');
        },

        methods: {
            init() {
                showOverlay();

                // Make the most important HTTP request to get all necessary data from the server.
                // Afterwards, init all mandatory stores and services.
                sharedStore.init(() => {
                    playback.init();
                    hideOverlay();

                    // Load the default view.
                    loadMainView('home');

                    // Ask for user's notification permission.
                    this.requestNotifPermission();

                    // To confirm or not to confirm closing, it's a question.
                    window.onbeforeunload = e => {
                        if (!preferences.confirmClosing) {
                            return;
                        }

                        return 'You asked Koel to confirm before closing, so here it is.';
                    };

                    // Let all other components know we're ready.
                    event.emit('koel:ready');
                }, () => this.authenticated = false);
            },

            /**
             * Toggle playback when user presses Space key.
             *
             * @param {Object} e The keydown event
             */
            togglePlayback(e) {
                if ($(e.target).is('input,textarea,button,select')) {
                    return true;
                }

                // Ah... Good ol' jQuery. Whatever play/pause control is there, we blindly click it.
                $('#mainFooter .play:visible, #mainFooter .pause:visible').click();
                e.preventDefault();
            },

            /**
             * Play the previous song when user presses K.
             *
             * @param {Object} e The keydown event
             */
            playPrev(e) {
                if ($(e.target).is('input,textarea')) {
                    return true;
                }

                playback.playPrev();
                e.preventDefault();
            },

            /**
             * Play the next song when user presses J.
             *
             * @param {Object} e The keydown event
             */
            playNext(e) {
                if ($(e.target).is('input,textarea')) {
                    return true;
                }

                playback.playNext();
                e.preventDefault();
            },

            /**
             * Put focus into the search field when user presses F.
             *
             * @param {Object} e The keydown event
             */
            search(e) {
                if ($(e.target).is('input,textarea') || e.metaKey || e.ctrlKey) {
                    return true;
                }

                $('#searchForm input[type="search"]').focus().select();
                e.preventDefault();
            },

            /**
             * Request for notification permission if it's not provided and the user is OK with notifs.
             */
            requestNotifPermission() {
                if (window.Notification && preferences.notify && Notification.permission !== 'granted') {
                    Notification.requestPermission(result => {
                        if (result === 'denied') {
                            preferences.notify = false;
                        }
                    });
                }
            },
        },

        created() {
            event.on({
                /**
                 * When the user logs in, set the whole app to be "authenticated" and initialize it.
                 */
               'user:loggedin': () => {
                    this.authenticated = true;
                    this.init();
                },

                /**
                 * Shows the "Edit Song" form.
                 *
                 * @param {Array.<Object>} An array of songs to edit
                 */
                'songs:edit': songs => this.$refs.editSongsForm.open(songs),

                /**
                 * Log the current user out and reset the application state.
                 */
                logout() {
                    userStore.logout(() => {
                        ls.remove('jwt-token');
                        forceReloadWindow();
                    });
                },
            });
        },
    };

    // …and the global directives
    Vue.directive('koel-focus', focusDirective);
</script>

<style lang="sass">
    @import "resources/assets/sass/partials/_vars.scss";
    @import "resources/assets/sass/partials/_mixins.scss";
    @import "resources/assets/sass/partials/_shared.scss";

    #dragGhost {
        position: relative;
        display: inline-block;
        background: $colorGreen;
        padding: .8rem;
        border-radius: .2rem;
        color: #fff;
        font-family: $fontFamily;
        font-size: 1rem;
        font-weight: $fontWeight_Thin;

        /**
         * We can totally hide this element on touch devices, because there's
         * no drag and drop support there anyway.
         */
        html.touchevents & {
            display: none;
        }
    }

    #main, .login-wrapper {
        display: flex;
        min-height: 100vh;
        flex-direction: column;

        background: $colorMainBgr;
        color: $colorMainText;

        font-family: $fontFamily;
        font-size: 1rem;
        line-height: 1.5rem;
        font-weight: $fontWeight_Thin;

        padding-bottom: $footerHeight;
    }

    .login-wrapper {
        @include vertical-center();

        padding-bottom: 0;
    }
</style>
