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

class TfElement extends LitElement {
	static get properties() {
		return {
			whoami: {type: String},
			hash: {type: String},
			unread: {type: Array},
			tab: {type: String},
			broadcasts: {type: Array},
			connections: {type: Array},
			loading: {type: Boolean},
			loaded: {type: Boolean},
			following: {type: Array},
			users: {type: Object},
			ids: {type: Array},
			channels: {type: Array},
			channels_unread: {type: Object},
			channels_latest: {type: Object},
		};
	}

	static styles = styles;

	constructor() {
		super();
		let self = this;
		this.hash = '#';
		this.unread = [];
		this.tab = 'news';
		this.broadcasts = [];
		this.connections = [];
		this.following = [];
		this.users = {};
		this.loaded = false;
		this.channels = [];
		this.channels_unread = {};
		this.channels_latest = {};
		this.loading_channels_latest = 0;
		this.loading_channels_latest_scheduled = 0;
		tfrpc.rpc.getBroadcasts().then((b) => {
			self.broadcasts = b || [];
		});
		tfrpc.rpc.getConnections().then((c) => {
			self.connections = c || [];
		});
		tfrpc.rpc.getHash().then((hash) => self.set_hash(hash));
		tfrpc.register(function hashChanged(hash) {
			self.set_hash(hash);
		});
		tfrpc.register(async function notifyNewMessage(id) {
			await self.fetch_new_message(id);
		});
		tfrpc.register(function set(name, value) {
			if (name === 'broadcasts') {
				self.broadcasts = value;
			} else if (name === 'connections') {
				self.connections = value;
			} else if (name === 'identity') {
				self.whoami = value;
			}
		});
		this.initial_load();
	}

	async initial_load() {
		let whoami = await tfrpc.rpc.getActiveIdentity();
		let ids = (await tfrpc.rpc.getIdentities()) || [];
		this.whoami = whoami ?? (ids.length ? ids[0] : undefined);
		this.ids = ids;
		await this.load_channels();
	}

	async load_channels() {
		let channels = await tfrpc.rpc.query(
			`
			SELECT
				content ->> 'channel' AS channel,
				content ->> 'subscribed' AS subscribed
			FROM
				messages
			WHERE
				author = ? AND
				content ->> 'type' = 'channel'
			ORDER BY sequence
		`,
			[this.whoami]
		);
		let channel_map = {};
		for (let row of channels) {
			if (row.subscribed) {
				channel_map[row.channel] = true;
			} else {
				delete channel_map[row.channel];
			}
		}
		this.channels = Object.keys(channel_map).sort();
	}

	connectedCallback() {
		super.connectedCallback();
		this._keydown = this.keydown.bind(this);
		window.addEventListener('keydown', this._keydown);
	}

	disconnectedCallback() {
		super.disconnectedCallback();
		window.removeEventListener('keydown', this._keydown);
	}

	keydown(event) {
		if (event.altKey && event.key == 'ArrowUp') {
			this.next_channel(1);
			event.preventDefault();
		} else if (event.altKey && event.key == 'ArrowDown') {
			this.next_channel(-1);
			event.preventDefault();
		}
	}

	next_channel(delta) {
		let channel_names = ['', '@'].concat(this.channels);
		let index = channel_names.indexOf(this.hash.substring(1));
		if (index != -1) {
			index += delta;
			this.set_hash(
				'#' +
					encodeURIComponent(
						channel_names[(index + channel_names.length) % channel_names.length]
					)
			);
		}
	}

	set_hash(hash) {
		this.hash = decodeURIComponent(hash || '#');
		if (this.hash.startsWith('#q=')) {
			this.tab = 'search';
		} else if (this.hash === '#connections') {
			this.tab = 'connections';
		} else if (this.hash.startsWith('#sql=')) {
			this.tab = 'query';
		} else {
			this.tab = 'news';
		}
	}

	async fetch_about(ids, users) {
		const k_cache_version = 1;
		let cache = await tfrpc.rpc.databaseGet('about');
		cache = cache ? JSON.parse(cache) : {};
		if (cache.version !== k_cache_version) {
			cache = {
				version: k_cache_version,
				about: {},
				last_row_id: 0,
			};
		}
		let max_row_id = (
			await tfrpc.rpc.query(
				`
			SELECT MAX(rowid) AS max_row_id FROM messages
		`,
				[]
			)
		)[0].max_row_id;
		for (let id of Object.keys(cache.about)) {
			if (ids.indexOf(id) == -1) {
				delete cache.about[id];
			}
		}

		let abouts = await tfrpc.rpc.query(
			`
				SELECT
					messages.id, messages.previous, messages.author, messages.sequence, messages.timestamp, messages.hash, json(messages.content) AS content, messages.signature
				FROM
					messages,
					json_each(?1) AS following
				WHERE
					messages.author = following.value AND
					messages.rowid > ?3 AND
					messages.rowid <= ?4 AND
					json_extract(messages.content, '$.type') = 'about'
				UNION
				SELECT
					messages.id, messages.previous, messages.author, messages.sequence, messages.timestamp, messages.hash, json(messages.content) AS content, messages.signature
				FROM
					messages,
					json_each(?2) AS following
				WHERE
					messages.author = following.value AND
					messages.rowid <= ?4 AND
					json_extract(messages.content, '$.type') = 'about'
				ORDER BY messages.author, messages.sequence
			`,
			[
				JSON.stringify(ids.filter((id) => cache.about[id])),
				JSON.stringify(ids.filter((id) => !cache.about[id])),
				cache.last_row_id,
				max_row_id,
			]
		);
		for (let about of abouts) {
			let content = JSON.parse(about.content);
			if (content.about === about.author) {
				delete content.type;
				delete content.about;
				cache.about[about.author] = Object.assign(
					cache.about[about.author] || {},
					content
				);
			}
		}
		cache.last_row_id = max_row_id;
		await tfrpc.rpc.databaseSet('about', JSON.stringify(cache));
		users = users || {};
		for (let id of Object.keys(cache.about)) {
			users[id] = Object.assign(users[id] || {}, cache.about[id]);
		}
		return Object.assign({}, users);
	}

	async fetch_new_message(id) {
		let messages = await tfrpc.rpc.query(
			`
				SELECT messages.id, previous, author, sequence, timestamp, hash, json(content) AS content, signature
				FROM messages
				JOIN json_each(?) AS following ON messages.author = following.value
				WHERE messages.id = ?
			`,
			[JSON.stringify(this.following), id]
		);
		for (let message of messages) {
			if (message.author == this.whoami) {
				let content = JSON.parse(message.content);
				if (content?.type == 'channel') {
					this.load_channels();
				}
			}
		}
		if (messages && messages.length) {
			this.unread = [...this.unread, ...messages];
			this.unread = this.unread.slice(this.unread.length - 1024);
		}
		this.schedule_load_channels_latest();
	}

	async _handle_whoami_changed(event) {
		let old_id = this.whoami;
		let new_id = event.srcElement.selected;
		console.log('received', new_id);
		if (this.whoami !== new_id) {
			console.log(event);
			this.whoami = new_id;
			console.log(`whoami ${old_id} => ${new_id}`);
			await tfrpc.rpc.localStorageSet('whoami', new_id);
		}
	}

	async create_identity() {
		if (confirm('Are you sure you want to create a new identity?')) {
			await tfrpc.rpc.createIdentity();
			this.ids = (await tfrpc.rpc.getIdentities()) || [];
			if (this.ids && !this.whoami) {
				this.whoami = this.ids[0];
			}
		}
	}

	async get_latest_private(following) {
		let latest = (await tfrpc.rpc.query('SELECT MAX(rowid) AS latest FROM messages'))[0].latest;
		const k_chunk_count = 256;
		while (latest - k_chunk_count >= 0) {
			let messages = await tfrpc.rpc.query(`
					SELECT messages.rowid, messages.id, previous, author, sequence, timestamp, hash, json(content) AS content, signature
						FROM messages
						JOIN json_each(?1) AS following ON messages.author = following.value
						WHERE
							messages.rowid > ?2 AND
							messages.rowid <= ?3 AND
							json(messages.content) LIKE '"%'
						ORDER BY sequence DESC
					`,
					[
						JSON.stringify(following),
						latest - k_chunk_count,
						latest,
					]);
			messages = (await this.decrypt(messages)).filter(x => x.decrypted);
			if (messages.length) {
				return Math.max(...messages.map(x => x.rowid));
			}
			latest -= k_chunk_count;
		};
		return -1;
	}

	async load_channels_latest(following) {
		this.loading_channels_latest++;
		try {
			let start_time = new Date();
			let latest_private = this.get_latest_private(following);
			let channels = await tfrpc.rpc.query(
				`
				SELECT channels.value AS channel, MAX(messages.rowid) AS rowid FROM messages
				JOIN json_each(?1) AS channels ON messages.content ->> 'channel' = channels.value
				JOIN json_each(?2) AS following ON messages.author = following.value
				WHERE messages.content ->> 'type' = 'post' AND messages.content ->> 'root' IS NULL
				GROUP by channel
				UNION
				SELECT '' AS channel, MAX(messages.rowid) AS rowid FROM messages
				JOIN json_each(?2) AS following ON messages.author = following.value
				UNION
				SELECT '@' AS channel, MAX(messages.rowid) AS rowid FROM messages_fts(?3)
				JOIN messages ON messages.rowid = messages_fts.rowid
				JOIN json_each(?2) AS following ON messages.author = following.value
			`,
				[
					JSON.stringify(this.channels),
					JSON.stringify(following),
					'"' + this.whoami.replace('"', '""') + '"',
				]
			);
			this.channels_latest = Object.fromEntries(
				channels.map((x) => [x.channel, x.rowid])
			);
			console.log('latest', this.channels_latest);
			console.log('unread', this.channels_unread);
			console.log('channels took', (new Date() - start_time) / 1000.0);
			let self = this;
			latest_private.then(function(latest) {
				self.channels_latest = Object.assign({}, self.channels_latest, {'🔐': latest});
				console.log('private took', (new Date() - start_time) / 1000.0);
			});
		} finally {
			this.loading_channels_latest--;
		}
	}

	_schedule_load_channels_latest_timer() {
		--this.loading_channels_latest_scheduled;
		this.schedule_load_channels_latest();
	}

	schedule_load_channels_latest() {
		if (!this.loading_channels_latest) {
			this.load_channels_latest(this.following);
		} else if (!this.loading_channels_latest_scheduled) {
			this.loading_channels_latest_scheduled++;
			setTimeout(this._schedule_load_channels_latest_timer, 5000);
		}
	}

	async load() {
		let whoami = this.whoami;
		let following = await tfrpc.rpc.following([whoami], 2);
		let users = {};
		let by_count = [];
		for (let [id, v] of Object.entries(following)) {
			users[id] = {
				following: v.of,
				blocking: v.ob,
				followed: v.if,
				blocked: v.ib,
			};
			by_count.push({count: v.of, id: id});
		}
		let channels_latest = this.load_channels_latest(Object.keys(following));
		this.channels_unread = JSON.parse(
			(await tfrpc.rpc.databaseGet('unread')) ?? '{}'
		);
		let start_time = new Date();
		users = await this.fetch_about(Object.keys(following).sort(), users);
		console.log(
			'about took',
			(new Date() - start_time) / 1000.0,
			'seconds for',
			Object.keys(users).length,
			'users'
		);
		start_time = new Date();
		await channels_latest;
		this.following = Object.keys(following);
		this.users = users;
		console.log(`load finished ${whoami} => ${this.whoami}`);
		this.whoami = whoami;
		this.loaded = whoami;
	}

	channel_set_unread(event) {
		this.channels_unread[event.detail.channel ?? ''] = event.detail.unread;
		this.channels_unread = Object.assign({}, this.channels_unread);
		tfrpc.rpc.databaseSet('unread', JSON.stringify(this.channels_unread));
	}

	async decrypt(messages) {
		let whoami = this.whoami;
		return Promise.all(messages.map(async function (message) {
			let content;
			try {
				content = JSON.parse(message?.content);
			} catch {}
			if (typeof content === 'string') {
				let decrypted;
				try {
					decrypted = await tfrpc.rpc.try_decrypt(whoami, content);
				} catch {}
				if (decrypted) {
					try {
						message.decrypted = JSON.parse(decrypted);
					} catch {
						message.decrypted = decrypted;
					}
				}
			}
			return message;
		}));
	}

	render_tab() {
		let following = this.following;
		let users = this.users;
		if (this.tab === 'news') {
			return html`
				<tf-tab-news
					id="tf-tab-news"
					.following=${this.following}
					whoami=${this.whoami}
					.users=${this.users}
					hash=${this.hash}
					.unread=${this.unread}
					@refresh=${() => (this.unread = [])}
					?loading=${this.loading}
					.channels=${this.channels}
					.channels_latest=${this.channels_latest}
					.channels_unread=${this.channels_unread}
					@channelsetunread=${this.channel_set_unread}
				></tf-tab-news>
			`;
		} else if (this.tab === 'connections') {
			return html`
				<tf-tab-connections
					.users=${this.users}
					.connections=${this.connections}
					.broadcasts=${this.broadcasts}
				></tf-tab-connections>
			`;
		} else if (this.tab === 'search') {
			return html`
				<tf-tab-search
					.following=${this.following}
					whoami=${this.whoami}
					.users=${this.users}
					query=${this.hash?.startsWith('#q=')
						? decodeURIComponent(this.hash.substring(3))
						: null}
				></tf-tab-search>
			`;
		} else if (this.tab === 'query') {
			return html`
				<tf-tab-query
					.following=${this.following}
					whoami=${this.whoami}
					.users=${this.users}
					query=${this.hash?.startsWith('#sql=')
						? decodeURIComponent(this.hash.substring(5))
						: null}
				></tf-tab-query>
			`;
		}
	}

	async set_tab(tab) {
		this.tab = tab;
		if (tab === 'news') {
			await tfrpc.rpc.setHash('#');
		} else if (tab === 'connections') {
			await tfrpc.rpc.setHash('#connections');
		} else if (tab === 'query') {
			await tfrpc.rpc.setHash('#sql=');
		}
	}

	refresh() {
		tfrpc.rpc.sync();
	}

	render() {
		let self = this;

		if (!this.loading && this.whoami && this.loaded !== this.whoami) {
			this.loading = true;
			this.load().finally(function () {
				self.loading = false;
			});
		}

		const k_tabs = {
			'📰': 'news',
			'📡': 'connections',
			'🔍': 'search',
			'👩‍💻': 'query',
		};

		let tabs = html`
			<div
				class="w3-bar w3-theme-l1"
				style="position: sticky; top: 0; z-index: 10"
			>
				<button
					class="w3-bar-item w3-button w3-circle w3-ripple"
					@click=${this.refresh}
				>
					↻
				</button>
				${Object.entries(k_tabs).map(
					([k, v]) => html`
						<button
							title=${v}
							class="w3-bar-item w3-padding w3-hover-theme tab ${self.tab == v
								? 'w3-theme-l2'
								: 'w3-theme-l1'}"
							@click=${() => self.set_tab(v)}
						>
							${k}
							<span class=${self.tab == v ? '' : 'w3-hide-small'}
								>${v.charAt(0).toUpperCase() + v.substring(1)}</span
							>
						</button>
					`
				)}
			</div>
		`;
		let contents = !this.loaded
			? this.loading
				? html`<div
							class="w3-panel w3-theme-l5 w3-card-4 w3-padding-large w3-round-xlarge"
						>
							Loading...
						</div>
						${this.render_tab()}`
				: html`<div>Select or create an identity.</div>`
			: this.render_tab();
		return html`
			<div
				style="width: 100vw; min-height: 100vh; height: 100%"
				class="w3-theme-dark"
			>
				${tabs} ${contents}
			</div>
		`;
	}
}

customElements.define('tf-app', TfElement);