import {LitElement, html, unsafeHTML, until} from './lit-all.min.js';
import * as tfrpc from '/static/tfrpc.js';
import {styles} from './tf-styles.js';

class TfTabNewsFeedElement extends LitElement {
	static get properties() {
		return {
			whoami: {type: String},
			users: {type: Object},
			hash: {type: String},
			following: {type: Array},
			messages: {type: Array},
			drafts: {type: Object},
		}
	}

	static styles = styles;

	constructor() {
		super();
		let self = this;
		this.whoami = null;
		this.users = {};
		this.hash = '#';
		this.following = [];
		this.drafts = {};
	}

	async fetch_messages() {
		if (this.hash.startsWith('#@')) {
			let r = await tfrpc.rpc.query(
				`
					WITH mine AS (SELECT messages.*
						FROM messages
						WHERE messages.author = ?
						ORDER BY sequence DESC
						LIMIT 20)
					SELECT messages.*
						FROM mine
						JOIN messages_refs ON mine.id = messages_refs.ref
						JOIN messages ON messages_refs.message = messages.id
					UNION
					SELECT * FROM mine
				`,
				[
					this.hash.substring(1),
				]);
			return r;
		} else if (this.hash.startsWith('#%')) {
			return await tfrpc.rpc.query(
				`
					SELECT messages.*
					FROM messages
					WHERE id = ?1
					UNION
					SELECT messages.*
					FROM messages JOIN messages_refs
					ON messages.id = messages_refs.message
					WHERE messages_refs.ref = ?1
				`,
				[
					this.hash.substring(1),
				]);
		} else {
			return await tfrpc.rpc.query(
				`
					WITH news AS (SELECT messages.*
					FROM messages
					JOIN json_each(?) AS following ON messages.author = following.value
					WHERE messages.timestamp > ?
					ORDER BY messages.timestamp DESC)
					SELECT messages.*
						FROM news
						JOIN messages_refs ON news.id = messages_refs.ref
						JOIN messages ON messages_refs.message = messages.id
					UNION
					SELECT messages.*
						FROM news
						JOIN messages_refs ON news.id = messages_refs.message
						JOIN messages ON messages_refs.ref = messages.id
					UNION
					SELECT news.* FROM news
				`,
				[
					JSON.stringify(this.following),
					new Date().valueOf() - 24 * 60 * 60 * 1000,
				]);
		}
	}

	render() {
		if (!this.messages ||
			this._messages_hash !== this.hash ||
			this._messages_following !== this.following) {
			console.log(`loading messages for ${this.whoami}`);
			let self = this;
			this.messages = [];
			this._messages_hash = this.hash;
			this._messages_following = this.following;
			this.fetch_messages().then(function(messages) {
				self.messages = messages;
				console.log(`loading mesages done for ${self.whoami}`);
			}).catch(function(error) {
				alert(JSON.stringify(error, null, 2));
			});
		}
		return html`<tf-news id="news" whoami=${this.whoami} .users=${this.users} .messages=${this.messages} .following=${this.following} .drafts=${this.drafts}></tf-news>`;
	}
}

class TfTabNewsElement extends LitElement {
	static get properties() {
		return {
			whoami: {type: String},
			users: {type: Object},
			hash: {type: String},
			unread: {type: Array},
			following: {type: Array},
			drafts: {type: Object},
		}
	}

	static styles = styles;

	constructor() {
		super();
		let self = this;
		this.whoami = null;
		this.users = {};
		this.hash = '#';
		this.unread = [];
		this.following = [];
		this.cache = {};
		this.drafts = {};
		tfrpc.rpc.localStorageGet('drafts').then(function(d) {
			self.drafts = JSON.parse(d || '{}');
		});
	}

	show_more() {
		let unread = this.unread;
		let news = this.renderRoot?.getElementById('news');
		if (news) {
			console.log('injecting messages', news.messages);
			news.messages = Object.values(Object.fromEntries([...this.unread, ...news.messages].map(x => [x.id, x])));
			this.dispatchEvent(new CustomEvent('refresh'));
		}
	}

	new_messages_text() {
		if (!this.unread?.length) {
			return 'No new messages.';
		}
		let counts = {};
		for (let message of this.unread) {
			let type = 'private';
			try {
				type = JSON.parse(message.content).type || type;
			} catch {
			}
			counts[type] = (counts[type] || 0) + 1;
		}
		return 'Show New: ' + Object.keys(counts).sort().map(x => (counts[x].toString() + ' ' + x + 's')).join(', ');
	}

	draft(event) {
		let id = event.detail.id || '';
		if (event.detail.draft !== undefined) {
			let draft = {};
			draft[id] = event.detail.draft;
			this.drafts = Object.assign({}, this.drafts, draft);
		} else {
			delete this.drafts[id];
			this.drafts = Object.assign({}, this.drafts);
		}
		tfrpc.rpc.localStorageSet('drafts', JSON.stringify(this.drafts));
	}

	render() {
		let profile = this.hash.startsWith('#@') ?
			html`<tf-profile id=${this.hash.substring(1)} whoami=${this.whoami} .users=${this.users}></tf-profile>` : undefined;
		return html`
			<div><input type="button" value=${this.new_messages_text()} @click=${this.show_more}></input></div>
			<a target="_top" href="#" ?hidden=${this.hash.length <= 1}>🏠Home</a>
			<div>Welcome, <tf-user id=${this.whoami} .users=${this.users}></tf-user>!</div>
			<div><tf-compose whoami=${this.whoami} .users=${this.users} .drafts=${this.drafts} @tf-draft=${this.draft}></tf-compose></div>
			${profile}
			<tf-tab-news-feed id="news" whoami=${this.whoami} .users=${this.users} .following=${this.following} hash=${this.hash} .drafts=${this.drafts} @tf-draft=${this.draft}></tf-tab-news-feed>
		`;
	}
}

customElements.define('tf-tab-news-feed', TfTabNewsFeedElement);
customElements.define('tf-tab-news', TfTabNewsElement);