<?php

declare(strict_types=1);

namespace WebCalendar\WP\Holiday;

defined( 'ABSPATH' ) || exit;

/**
 * Holiday provider using Google Calendar public holiday feeds.
 */
class GoogleCalendarProvider implements HolidayProviderInterface {

	private const URL_TEMPLATE = 'https://calendar.google.com/calendar/ical/en.%s%%23holiday%%40group.v.calendar.google.com/public/basic.ics';

	public function get_id(): string {
		return 'google';
	}

	public function get_label(): string {
		return __( 'Google Calendar (Public Holidays)', 'agenticdaisy-calendar' );
	}

	/**
	 * @return array<string, string>
	 */
	public function get_countries(): array {
		return [
			'australian'  => 'Australia',
			'austrian'    => 'Austria',
			'brazilian'   => 'Brazil',
			'canadian'    => 'Canada',
			'china'       => 'China',
			'christian'   => 'Christian Holidays',
			'croatian'    => 'Croatia',
			'czech'       => 'Czech Republic',
			'danish'      => 'Denmark',
			'dutch'       => 'Netherlands',
			'finnish'     => 'Finland',
			'french'      => 'France',
			'german'      => 'Germany',
			'greek'       => 'Greece',
			'hong_kong'   => 'Hong Kong',
			'hungarian'   => 'Hungary',
			'indian'      => 'India',
			'indonesian'  => 'Indonesia',
			'iranian'     => 'Iran',
			'irish'       => 'Ireland',
			'islamic'     => 'Islamic Holidays',
			'italian'     => 'Italy',
			'japanese'    => 'Japan',
			'jewish'      => 'Jewish Holidays',
			'malaysia'    => 'Malaysia',
			'mexican'     => 'Mexico',
			'new_zealand' => 'New Zealand',
			'norwegian'   => 'Norway',
			'philippines' => 'Philippines',
			'polish'      => 'Poland',
			'portuguese'  => 'Portugal',
			'romanian'    => 'Romania',
			'russian'     => 'Russia',
			'sa'          => 'South Africa',
			'singapore'   => 'Singapore',
			'south_korea' => 'South Korea',
			'spanish'     => 'Spain',
			'swedish'     => 'Sweden',
			'taiwan'      => 'Taiwan',
			'thai'        => 'Thailand',
			'turkish'     => 'Turkey',
			'uk'          => 'United Kingdom',
			'usa'         => 'United States',
			'vietnamese'  => 'Vietnam',
		];
	}

	public function fetch_holidays( string $country_code, int $year ): string {
		$url = sprintf( self::URL_TEMPLATE, rawurlencode( $country_code ) );

		$response = wp_remote_get(
			$url,
			[
				'timeout' => 15,
			]
		);

		if ( is_wp_error( $response ) ) {
			throw new \RuntimeException( esc_html( $response->get_error_message() ) );
		}

		$code = wp_remote_retrieve_response_code( $response );
		if ( 200 !== $code ) {
			throw new \RuntimeException(
				// translators: 1: HTTP status code, 2: country code.
				sprintf( esc_html__( 'Google Calendar returned HTTP %1$d for %2$s', 'agenticdaisy-calendar' ), (int) $code, esc_html( $country_code ) )
			);
		}

		$body = wp_remote_retrieve_body( $response );
		if ( empty( $body ) ) {
			throw new \RuntimeException( esc_html__( 'Empty response from Google Calendar', 'agenticdaisy-calendar' ) );
		}

		return $body;
	}
}