<template>
<div class="mk-timeline">
	<mk-following-setuper v-if="alone"/>
	<div class="loading" v-if="fetching">
		<mk-ellipsis-icon/>
	</div>
	<p class="empty" v-if="posts.length == 0 && !fetching">%fa:R comments%自分の投稿や、自分がフォローしているユーザーの投稿が表示されます。</p>
	<mk-posts :posts="posts" ref="timeline"/>
</div>
</template>

<script lang="ts">
import Vue from 'vue';

export default Vue.extend({
	props: {
		date: {
			type: Date,
			required: false
		}
	},
	data() {
		return {
			fetching: true,
			moreFetching: false,
			posts: [],
			connection: null,
			connectionId: null
		};
	},
	computed: {
		alone(): boolean {
			return this.$root.$data.os.i.following_count == 0;
		}
	},
	mounted() {
		this.connection = this.$root.$data.os.stream.getConnection();
		this.connectionId = this.$root.$data.os.stream.use();

		this.connection.on('post', this.onPost);
		this.connection.on('follow', this.onChangeFollowing);
		this.connection.on('unfollow', this.onChangeFollowing);

		document.addEventListener('keydown', this.onKeydown);
		window.addEventListener('scroll', this.onScroll);

		this.fetch();
	},
	beforeDestroy() {
		this.connection.off('post', this.onPost);
		this.connection.off('follow', this.onChangeFollowing);
		this.connection.off('unfollow', this.onChangeFollowing);
		this.$root.$data.os.stream.dispose(this.connectionId);

		document.removeEventListener('keydown', this.onKeydown);
		window.removeEventListener('scroll', this.onScroll);
	},
	methods: {
		fetch(cb?) {
			this.fetching = true;

			this.$root.$data.os.api('posts/timeline', {
				until_date: this.date ? (this.date as any).getTime() : undefined
			}).then(posts => {
				this.fetching = false;
				this.posts = posts;
				if (cb) cb();
			});
		},
		more() {
			if (this.moreFetching || this.fetching || this.posts.length == 0) return;
			this.moreFetching = true;
			this.$root.$data.os.api('posts/timeline', {
				until_id: this.posts[this.posts.length - 1].id
			}).then(posts => {
				this.moreFetching = false;
				this.posts.unshift(posts);
			});
		},
		onPost(post) {
			this.posts.unshift(post);
		},
		onChangeFollowing() {
			this.fetch();
		},
		onScroll() {
			const current = window.scrollY + window.innerHeight;
			if (current > document.body.offsetHeight - 8) this.more();
		},
		onKeydown(e) {
			if (e.target.tagName != 'INPUT' && e.target.tagName != 'TEXTAREA') {
				if (e.which == 84) { // t
					(this.$refs.timeline as any).focus();
				}
			}
		}
	}
});
</script>

<style lang="stylus" scoped>
.mk-timeline
	background #fff
	border solid 1px rgba(0, 0, 0, 0.075)
	border-radius 6px

	> mk-following-setuper
		border-bottom solid 1px #eee

	> .loading
		padding 64px 0

	> .empty
		display block
		margin 0 auto
		padding 32px
		max-width 400px
		text-align center
		color #999

		> [data-fa]
			display block
			margin-bottom 16px
			font-size 3em
			color #ccc

</style>
