'use strict';
const React = require('react');
const create = require('create-react-class');
const Promise = require('bluebird');
const colorConvert = require('color-convert');
const sanitize = require('sanitize-html');

const riot = require('../lib/riot-utils.js');
const FileUpload = require('./fileUpload.js');

let input = create({
	displayName: "Input",

	getInitialState: function() {
		return {
			uploads: []
		};
	},

	setRef: function(ref) {
		if (ref !=null) {
			ref.addEventListener("keydown", (e) => {
				// only send on plain 'enter'
				if (e.key == "Enter") {
					if (!e.shiftKey && !e.altKey && !e.ctrlKey) {
						this.send(e);
						return;
					}
				}
			});
			ref.addEventListener('change',  this.resize_textarea);
			ref.addEventListener('cut',     this.resize_textarea_delayed);
			ref.addEventListener('paste',   this.resize_textarea_delayed);
			ref.addEventListener('drop',    this.resize_textarea_delayed);
			ref.addEventListener('keydown', this.resize_textarea_delayed);
			this.setState({ref: ref});
		}
	},

	addUpload: function(upload) {
		let uploads = this.state.uploads;
		uploads.push(upload);
		this.setState({uploads: uploads});
	},

	removeUpload: function(index) {
		let uploads = this.state.uploads;
		uploads.splice(index, 1);
		this.setState({uploads: uploads});
	},

	resize_textarea: function(element) {
		if (element == undefined) {
			return;
		}
		let ref = element.target;
		if (ref != undefined) {
			ref.style.height = 'auto';
			ref.style.height = ref.scrollHeight+'px';
		}
	},

	resize_textarea_delayed: function(e) {
		setTimeout(() => this.resize_textarea(e), 5);
	},

	send: function(e) {
		let msg = e.target.value;
		if (msg.trim().length != 0) {
			//TODO: parse markdown (commonmark?)
			if (msg.startsWith('/')) {
				// Handle other commands
				let parts = msg.split(' ');
				let command = parts[0];
				let result = handleCommands(command, parts);
				if (result != null) {
					if (result.type == "html") {
						this.sendHTML(result.content);
					} else {
						this.sendPlain(result.content);
					}
				}
			} else {
				this.sendPlain(msg);
			}
		}

		if (this.state.uploads.length > 0) {
			this.uploadFiles(this.state.uploads);
			this.setState({uploads: []});
		}
		e.target.value = "";
		e.preventDefault();
		this.resize_textarea_delayed(e);
	},

	uploadFiles: function(uploads) {
		let client = this.props.client;

		return Promise.map(uploads, (upload) => {
			let fileUploadPromise = client.uploadContent(upload.file,
				{onlyContentUri: false}).then((response) => {
				return response.content_uri;
			});

			let mimeType = upload.file.type;
			let eventType = "m.file";
			let additionalPromise;
			if (mimeType.startsWith("image/") || mimeType.startsWith("video/")) {
				function elementToThumbnail(element) {
					return Promise.try(() => {
						return riot.createThumbnail(element,
							element.width,
							element.height,
							thumbnailType
						);
					}).catch((error) => {
						console.error("neo: error getting thumbnail", error);

						throw error;
					}).then((thumbResult) => {
						return client.uploadContent(thumbResult.thumbnail, {onlyContentUri: false});
					}).then((response) => {
						return {
							thumbnail_url: response.content_uri,
							thumbnail_info: {
								mimetype: thumbnailType
							}
						};
					});
				}
				if (mimeType.startsWith("image/")) {
					eventType = "m.image";
					additionalPromise = riot.loadImageElement(upload.file)
						.then((element) => {return elementToThumbnail(element);});
				} else if (mimeType.startsWith("video/")) {
					eventType = "m.video";
					additionalPromise = riot.loadVideoElement(upload.file)
						.then((element) => {return elementToThumbnail(element);});
				}
				// create and upload thumbnail
				let thumbnailType = "image/png";

				if (mimeType == "image/jpeg") {
					thumbnailType = mimeType;
				}
			} else if (mimeType.startsWith("audio/")) {
				eventType = "m.audio";
			} else {
				// m.file
			}

			return Promise.all([fileUploadPromise, additionalPromise]).then((result) => {
				console.log(result);
				let info = {
					mimetype: mimeType
				};

				if (result[1] != undefined) {
					info = Object.assign(info, result[1]);
				}

				return client.sendEvent(this.props.roomId, "m.room.message", {
					body: upload.file.name,
					msgtype: eventType,
					info: info,
					url: result[0]
				});
			});
		});
	},

	sendPlain: function(string) {
		let content = {
			body: string,
			msgtype: "m.text"
		};
		content = this.sendReply(content);
		/* FIXME: Promisify */
		this.props.client.sendEvent(this.props.roomId, "m.room.message", content, (err, _res) => {
			if (err != null) {
				console.log(err);
			}
		});
	},

	sendHTML: function(html) {
		let content = {
			body: sanitize(html, {allowedTags: []}),
			formatted_body: html,
			format: "org.matrix.custom.html",
			msgtype: "m.text"
		};

		content = this.sendReply(content);

		/* FIXME: Promisify */
		this.props.client.sendEvent(this.props.roomId, "m.room.message", content, (err, _res) => {
			console.log(err);
		});
	},

	sendReply: function(content) {
		if (this.props.replyEvent != undefined) {
			content['m.relates_to'] = {
				'm.in_reply_to': {
					event_id: this.props.replyEvent.event_id
				}
			};
			this.props.onReplyClick();
		}
		return content;
	},

	render: function() {
		return <div className="input">
			{this.props.replyEvent &&
				<div className="replyEvent" onClick={() => this.props.onReplyClick()}>
					{this.props.replyEvent.plaintext()}
				</div>
			}
			{this.state.uploads.length > 0 &&
				<div className="imgPreview">
					{this.state.uploads.map((upload, key) => {
						return (
							<div key={key}>
								<img src={upload.preview}/>
								<span onClick={() => this.removeUpload(key)}>X</span>
							</div>
						);
					})}
				</div>
			}
			<div className="content">
				<textarea ref={this.setRef} rows="1" spellCheck="false" placeholder="unencrypted message"></textarea>
				<FileUpload addUpload={this.addUpload}/>
			</div>
		</div>;
	}
});

function handleCommands(command, parts) {
	if (command == "/rainbow") {
		if (parts.length < 2) {
			return;
		}
		let string = parts[1];
		for(let i=2; i < parts.length; i++) {
			string += " " + parts[i];
		}
		let html = rainbowTransform(string);
		return {
			type: 'html',
			content: html
		};
	}
	return null;
}

function rainbowTransform(text) {
	let array = text.split("");
	let delta = 360/text.length;
	if (delta < 10) {
		delta = 10;
	} else if (delta > 20) {
		delta = 20;
	}
	let h = -1 * delta; // start at beginning

	let rainbowArray = array.map((char) => {
		h = h + delta;
		if (h > 360) {
			h = 0;
		}
		return `<font color="${colorConvert.hsl.hex(h, 100, 50)}">${char}</font>`;
	});
	let rainbow = rainbowArray.join("");
	return rainbow;
}

module.exports = input;