import fs from "fs";

export class Records {
	constructor(records = {}) {
		if (typeof records.records === "object")
			for (const [ key, value ] of Object.entries(records.records)) {
				const oldTableMatches = key.match(/^monthly_total_(\d{4})-(\d{2})$/);
				if (oldTableMatches) {
					const year = oldTableMatches[1];
					const month = oldTableMatches[2];
					if (!this.monthlyTotals) this.monthlyTotals = {};
					if (!this.monthlyTotals[year]) this.monthlyTotals[year] = {};
					this.monthlyTotals[year][month] = value;
				} else if (key === "record_calls" && typeof value === "object" && value !== null)
					this.callRecord = new CallRecord(value.date, value.count);
				else if (key === "total_calls_ever_placed" && typeof value === "number")
					this.totalCallsEverPlaced = value;
				else throw new Error(`Unknown legacy record key: ${key}`);
			}
		else
			for (const [ key, value ] of Object.entries(records))
				this[key] = value;
	}

	static fromJSONFile(path) {
		const data = fs.readFileSync(path, "utf-8");
		const obj = JSON.parse(data);

		return new Records(obj);
	}

	toJSONFile(path) {
		const data = JSON.stringify(this, null, 2);
		fs.writeFileSync(path, data, "utf-8");
	}

	/**
	 * @type {CallRecord}
	 */
	callRecord;
	/**
	 * @type {number}
	 */
	totalCallsEverPlaced;
	/**
	 * @type {{[year: string]: {[month: string]: number}}}
	 */
	monthlyTotals;
}

export class CallRecord {
	constructor(date, count) {
		this.date = date;
		this.count = count;
	}

	/**
	 * @type {string} YYYY-MM-DD
	 */
	date;
	/**
	 * @type {number}
	 */
	count;
}

// test (mjs)
if (import.meta.url === `file://${process.argv[1]}`) {
	const records = Records.fromJSONFile("records.json");
	console.log(records);
	console.log(JSON.stringify(records, null, 2));
}