import { format } from 'date-fns';
import { parse } from 'yaml';

import slugify from '#/utils/slugify.js';
import ellipsis from '#/utils/ellipsis.js';

const genderMap = {
	f: 'female',
	m: 'male',
	t: 'transsexual',
	o: 'other',
	u: null,
};

const propProcessors = {
	channel: (sceneInfo) => sceneInfo.channel?.name || sceneInfo.network?.name,
	network: (sceneInfo) => sceneInfo.network?.name || sceneInfo.channel?.name,
	actors: (sceneInfo, options) => {
		const genders = (options.genders || 'fmtou').split('').map((genderKey) => genderMap[genderKey]);

		return sceneInfo.actors
			.filter((actor) => genders.includes(actor.gender))
			.map((actor) => actor.name);
	},
	tags: (sceneInfo, options) => sceneInfo.tags
		.filter((tag) => {
			if (options.include && !options.include.includes(tag.slug)) {
				return false;
			}

			if (options.exclude?.includes(tag.slug)) {
				return false;
			}

			if (options.priority && tag.priority < options.priority) {
				return false;
			}

			return true;
		})
		.map((tag) => tag.name),
	movie: (sceneInfo) => sceneInfo.movies[0]?.title,
	date: (sceneInfo, options) => format(sceneInfo.effectiveDate, options.format || 'yyyy-MM-dd'),
};

function curateValue(value, item) {
	return [].concat(value) // account for both arrays (actors, tags) and strings (title, channel)
		.slice(0, item.limit || Infinity)
		.map((listValue) => (item.slugify ? slugify(listValue, item.slugify) : listValue))
		.map((listValue) => ellipsis(listValue, item.slice || Infinity, item.ellipsis || ''))
		.join(item.delimit || ', ');
}

function traverseTemplate(chain, release, {
	delimit = ' ',
	wrap = ['', ''],
} = {}) {
	const results = chain.reduce((result, item) => {
		const keys = typeof item === 'string' ? item : item.key;

		if ((item.channels && !item.channels.includes(release.channel?.slug)) || item.notChannels?.includes(release.channel?.slug)) {
			return result;
		}

		if ((item.networks && !item.networks.includes(release.network?.slug)) || item.notNetworks?.includes(release.network?.slug)) {
			return result;
		}

		if (keys) {
			const value = keys.split('|').reduce((acc, key) => acc
				|| propProcessors[key]?.(release, typeof item === 'string' ? { key } : item)
				|| release[key], null);

			return result.concat(curateValue(value, item));
		}

		if (item.items) {
			const group = traverseTemplate(item.items, release, {
				delimit: item.delimit,
				wrap: item.wrap,
			});

			return result.concat(curateValue(group, item));
		}

		return result;
	}, []);

	if (results.length > 0) {
		return `${wrap[0] || ''}${results.filter(Boolean).join(delimit)}${wrap[1] || ''}`;
	}

	return '';
}

export default function processSummaryTemplate(template, release) {
	const chain = parse(template);

	return traverseTemplate(chain, release);
}