'use strict';

const config = require('config');

const knex = require('../knex');
const logger = require('../logger')(__filename);
const http = require('./http');
const slugify = require('./slugify');
const argv = require('../argv');
const redis = require('../redis');

async function resolvePlace(query) {
	if (!query) {
		return null;
	}

	const cacheKey = `place-${slugify(query)}`;
	const cachedPlace = await redis.hGetAll(cacheKey);

	if (cachedPlace && argv.placeCache !== false) {
		await redis.expire(cacheKey, 3600 * 24 * 30);

		logger.debug(`Using cached place '${cacheKey}' for query '${query}': ${JSON.stringify(cachedPlace)}`);

		return cachedPlace;
	}

	// query is a nationality, lookup would get weird results (British resolves to British, Northern Ireland)
	const country = await knex('countries')
		.where('nationality', 'ilike', `%${query}%`)
		.orWhere('alpha3', 'ilike', `%${query}%`)
		.orWhere('alpha2', 'ilike', `%${query}%`)
		.orderBy('priority', 'desc')
		.first();

	if (country) {
		return {
			country: country.alpha2,
		};
	}

	try {
		// https://operations.osmfoundation.org/policies/nominatim/
		const res = await http.get(`https://nominatim.openstreetmap.org/search?q=${encodeURI(query)}&format=json&accept-language=en&addressdetails=1`, {
			headers: {
				'User-Agent': config.location.userAgent,
			},
			interval: 1000,
			concurrency: 1,
		});

		const [item] = res.body;

		if (item && item.address) {
			const rawPlace = item.address;
			const place = {};

			if (item.class === 'place' || item.class === 'boundary') {
				const location = rawPlace[item.type] || rawPlace.city || rawPlace.place;

				if (location) {
					place.place = location;
					place.city = rawPlace.city || location;
				}
			}

			if (rawPlace.state) place.state = rawPlace.state;
			if (rawPlace.country_code) place.country = rawPlace.country_code.toUpperCase();
			if (rawPlace.continent) place.continent = rawPlace.continent;

			logger.debug(`Resolved place '${query}' to ${JSON.stringify(place)}`);

			await redis.hSet(cacheKey, place);
			await redis.expire(cacheKey, 3600 * 24 * 30);

			return place;
		}
	} catch (error) {
		logger.error(`Failed to resolve place '${query}': ${error.message}`);
	}

	return null;
}

module.exports = resolvePlace;