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

class TfComposeElement extends LitElement {
	static get properties() {
		return {
			whoami: {type: String},
			users: {type: Object},
			root: {type: String},
			branch: {type: String},
		}
	}

	constructor() {
		super();
		this.users = {};
		this.root = undefined;
		this.branch = undefined;
	}

	changed(event) {
		let edit = this.renderRoot.getElementById('edit');
		let preview = this.renderRoot.getElementById('preview');
		preview.innerHTML = tfutils.markdown(edit.value);
	}

	submit() {
		let self = this;
		let edit = this.renderRoot.getElementById('edit');
		let message = {
			type: 'post',
			text: edit.value,
		};
		if (this.root || this.branch) {
			message.root = this.root;
			message.branch = this.branch;
		}
		console.log('Would post:', message);
		tfrpc.rpc.appendMessage(this.whoami, message).then(function() {
			edit.value = '';
			self.changed();
		}).catch(function(error) {
			alert(error.message);
		});
	}

	discard() {
		let edit = this.renderRoot.getElementById('edit');
		edit.value = '';
		this.changed();
		this.dispatchEvent(new CustomEvent('tf-discard'));
	}

	attach() {
		let self = this;
		let edit = this.renderRoot.getElementById('edit');
		let input = document.createElement('input');
		input.type = 'file';
		input.onchange = function(event) {
			let file = event.target.files[0];
			file.arrayBuffer().then(function(buffer) {
				let bin = Array.from(new Uint8Array(buffer));
				return tfrpc.rpc.store_blob(bin);
			}).then(function(id) {
				edit.value += `\n![${file.name}](${id})`;
				self.changed();
			}).catch(function(e) {
				alert(e.message);
			});
		};
		input.click();
	}

	render() {
		return html`
			<div style="display: flex; flex-direction: row; width: 100%">
				<textarea id="edit" @input=${this.changed} style="flex: 1 0 50%"></textarea>
				<div id="preview" style="flex: 1 0 50%"></div>
			</div>
			<input type="button" value="Submit" @click=${this.submit}></input>
			<input type="button" value="Attach" @click=${this.attach}></input>
			<input type="button" value="Discard" @click=${this.discard}></input>
		`;
	}
}

customElements.define('tf-compose', TfComposeElement);