"use strict"

function sort_table_column(table, column) {
	const minute = 60000
	const hour = 60 * minute
	const day = 24 * hour
	const week = 7 * day

	function is_date(s) {
		if (s.match(/^\d{4}-\d{2}-\d{2}$/))
			return true
		if (s.match(/^\d+ (minutes?|hours?|days|weeks) ago$/))
			return true
		if (s.match(/^(Yesterday|now)$/))
			return true
		return false
	}

	function parse_date(s) {
		if (s.match(/^\d{4}-\d{2}-\d{2}$/))
			return new Date(s).valueOf()
		if (s === "now")
			return Date.now()
		if (s === "Yesterday")
			return Date.now() - day
		let [ _, value, unit ] = s.match(/^(\d+) (minutes?|hours?|days|weeks) ago$/)
		switch (unit) {
		default:
			unit = 0
			break
		case "minute":
		case "minutes":
			unit = minute
			break
		case "hours":
		case "hours":
			unit = hour
			break
		case "days":
			unit = day
			break
		case "weeks":
			unit = week
			break
		}
		return Date.now() - Number(value) * unit
	}

	let tbody = table.querySelector("tbody")
	let rows = Array.from(tbody.querySelectorAll("tr"))
	rows.sort((row_a, row_b) => {
		let cell_a = row_a.querySelectorAll("td")[column].textContent
		let cell_b = row_b.querySelectorAll("td")[column].textContent
		if (is_date(cell_a) && is_date(cell_b)) {
			let age_a = parse_date(cell_a)
			let age_b = parse_date(cell_b)
			if (age_a > age_b) return -1
			if (age_a < age_b) return 1
			return 0
		} else if (cell_a.match(/^\d+$/) && cell_b.match(/^\d+$/)) {
			cell_a = Number(cell_a)
			cell_b = Number(cell_b)
			if (cell_a > cell_b) return -1
			if (cell_a < cell_b) return 1
			return 0
		} else {
			if (cell_a > cell_b) return 1
			if (cell_a < cell_b) return -1
			return 0
		}
	})
	rows.forEach((row) => tbody.appendChild(row))
}

document.querySelectorAll("table.sort").forEach((table) => {
	table.querySelectorAll("th").forEach((th, column) => {
		if (th.textContent !== "") {
			th.addEventListener("click", (evt) => sort_table_column(table, column))
			th.style.cursor = "pointer"
		}
	})
})