/*
	- Export Google Reminders from Google Takeout
	- Add this script to the HTML page
	- Open the console and copy the results into a file
	- Run task import results.json
	- Recurring events are not processed, but logged for manual entry
*/

const root = document.body.children[0];

const KEY_RECURRENCE_INFO = 'recurrence_info';
const KEY_CREATED_TIME = 'created_time';
const KEY_DUE_DATE = 'due_date';
const KEY_STATE = 'state';
const KEY_TITLE = 'title';

const STATE_ACTIVE = 'active';
const STATE_ARCHIVED = 'archived';
const STATE_UPCOMING = 'upcoming';

function parseReminder(node) {
	const out = {};
	out.id = node.getAttribute('data-reminder-id');

	const container = node.children[0];
	let recurrence_found = false;
	for(let i = 0; i < container.children.length; i++) {
		const prop = container.children[i];
		if(prop.children[0].tagName.toLowerCase() !== 'label') throw new Error(`Expected <label>, got ${prop.children[0].tagName}`);

		const key = prop.children[0].innerHTML.toLowerCase().slice(0, -1).replace(/ /g, '_');

		const value = prop.children[1].innerHTML;
		switch(key) {
			case KEY_CREATED_TIME:
			case KEY_DUE_DATE:
				out[key] = new Date(parseInt(value));
				break;
			case KEY_RECURRENCE_INFO:
				recurrence_found = true;
			default:
				out[key] = value;
		}
	}

	if(recurrence_found) {
		console.log('Not processing:', out);
		return;
	}

	return out;
}

window.output = [...root.children].map(parseReminder);

function uuidv4() {
	return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
		var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
		return v.toString(16);
	});
}


let jsonOutput = '';
for(const t of window.output) {
	if(!t) continue;
	let data = {
		uuid: uuidv4(),
		description: t.title,
		status: (function(){
			switch(t.state) {
				case 'archived':
					return 'completed';
				case 'upcoming':
				case 'active':
					return 'pending';
				default:
					throw new Error(`Unknown state: ${t.state}`);
			}
		})(),
		entry: t.created_time.toISOString().replace(/-|:|(\.\d\d\d)/g,''),
		due: t.due_date ? t.due_date.toISOString().replace(/-|:|(\.\d\d\d)/g,'') : t.created_time.toISOString().replace(/-|:|(\.\d\d\d)/g,''),
	};
	if(data.status == 'completed') {
		data.end = data.due;
	}

	jsonOutput += JSON.stringify(data) + '\n';
}

console.log(jsonOutput);