Goes through defined seasons and sets their episodes' status to the wanted status.

TVMaze-Set-Episode-Status.js

/**
 * Delays the script execution for a specified amount of time. Returns a promise that gets resolved after `amount` ms. Must be called in an `async` function with `await`.
 * @param {Number} amount The length in ms. Default: `1000`.
 * @returns {Promise} The promise.
 */
function sleep(amount = 1000) {
	return new Promise((resolve) => {
		setTimeout(resolve, amount);
	});
}

/**
 * @param {Number} from - Number of start season. Default: `1`.
 * @param {Number} until - Number of end season (including). Default: `20`.
 * @param {('watched' | 'acquired' | 'skipped')} status - The desired status. Default: `watched`.
 * @param {Boolean} [overwrite=false] - If an episode already has a status, `true` will overwrite it. `false` will skip the episode. Default: `false`.
 *
 */
async function setEpisodeStatus(from = 1, until = 20, status = 'watched', overwrite = false) {
	console.group('Setting episode status', { from, until, status, overwrite });
	if (from > until) {
		[from, until] = [until, from];
	}
	for (let i = from; i <= until; i++) {
		const header = document.querySelector(`#S${i.toString().padStart(2, '0')}`);
		if (!header) continue;
		const section = header.nextElementSibling;
		if (!section) continue;
		const tributtons = section.querySelectorAll('.tributton-watch');
		if (!tributtons) continue;
		console.group('Season', i);
		for (const [epIndex, tributton] of tributtons.entries()) {
			if (tributton.querySelector) {
				if (overwrite || !tributton.querySelector('.active')) {
					const button = tributton.querySelector(`.${status}`);
					if (button) {
						if (!button.classList.contains('active')) {
							button.click();
							console.log(`Episode ${epIndex} set to "${status}"`);
							await sleep(500);
						} else {
							console.log(`Episode ${epIndex} is already set to "${status}"`);
						}
					}
				} else {
					console.log(`Episode`, epIndex);
				}
			}
		}
		console.groupEnd();
	}
	console.log('ALL DONE');
	console.groupEnd();
}

// Parameters:
// 1 = season from
// 2 = season until
// 3 = status ('watched' or 'acquired' or 'skipped')
// 4 = Overwrites the episode's current value. Default: `false`
setEpisodeStatus(1, 7, 'watched');