<?php

declare(strict_types=1);

namespace WebCalendar\WP\Holiday;

defined( 'ABSPATH' ) || exit;

/**
 * Holiday provider using Thunderbird community-maintained ICS files.
 */
class ThunderbirdProvider implements HolidayProviderInterface {

	private const URL_TEMPLATE = 'https://raw.githubusercontent.com/thunderbird/thunderbird-website/master/media/caldata/autogen/%sHolidays.ics';

	/**
	 * Mapping of country codes to Thunderbird file name prefixes.
	 *
	 * Prefixes match the actual file names in the Thunderbird GitHub repo
	 * (media/caldata/autogen/{prefix}Holidays.ics).
	 *
	 * @var array<string, string>
	 */
	private const COUNTRY_MAP = [
		'AR' => 'Argentina',
		'AU' => 'Australia',
		'AT' => 'Austrian',
		'BE' => 'Belgian',
		'BR' => 'Brazil',
		'CA' => 'Canada',
		'CL' => 'Chile',
		'CN' => 'China',
		'CO' => 'Colombian',
		'CZ' => 'Czech',
		'DK' => 'Denmark',
		'FI' => 'Finland',
		'FR' => 'French',
		'DE' => 'German',
		'GR' => 'Greece',
		'HU' => 'Hungarian',
		'IN' => 'India',
		'IE' => 'Ireland',
		'IT' => 'Italian',
		'JP' => 'Japan',
		'MX' => 'Mexico',
		'NL' => 'Dutch',
		'NZ' => 'NewZealand',
		'NO' => 'Norwegian',
		'PL' => 'Polish',
		'PT' => 'Portugal',
		'RO' => 'Romania',
		'RU' => 'Russia',
		'ZA' => 'SouthAfrica',
		'KR' => 'SouthKorea',
		'ES' => 'Spain',
		'SE' => 'Swedish',
		'CH' => 'Swiss',
		'TW' => 'Taiwan',
		'TR' => 'Turkey',
		'GB' => 'UK',
		'US' => 'US',
	];

	/**
	 * Human-readable country names keyed by code.
	 *
	 * @var array<string, string>
	 */
	private const COUNTRY_NAMES = [
		'AR' => 'Argentina',
		'AU' => 'Australia',
		'AT' => 'Austria',
		'BE' => 'Belgium',
		'BR' => 'Brazil',
		'CA' => 'Canada',
		'CL' => 'Chile',
		'CN' => 'China',
		'CO' => 'Colombia',
		'CZ' => 'Czech Republic',
		'DK' => 'Denmark',
		'FI' => 'Finland',
		'FR' => 'France',
		'DE' => 'Germany',
		'GR' => 'Greece',
		'HU' => 'Hungary',
		'IN' => 'India',
		'IE' => 'Ireland',
		'IT' => 'Italy',
		'JP' => 'Japan',
		'MX' => 'Mexico',
		'NL' => 'Netherlands',
		'NZ' => 'New Zealand',
		'NO' => 'Norway',
		'PL' => 'Poland',
		'PT' => 'Portugal',
		'RO' => 'Romania',
		'RU' => 'Russia',
		'ZA' => 'South Africa',
		'KR' => 'South Korea',
		'ES' => 'Spain',
		'SE' => 'Sweden',
		'CH' => 'Switzerland',
		'TW' => 'Taiwan',
		'TR' => 'Turkey',
		'GB' => 'United Kingdom',
		'US' => 'United States',
	];

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

	public function get_label(): string {
		return __( 'Thunderbird (Community Holidays)', 'agenticdaisy-calendar' );
	}

	/**
	 * @return array<string, string>
	 */
	public function get_countries(): array {
		return self::COUNTRY_NAMES;
	}

	public function fetch_holidays( string $country_code, int $year ): string {
		$prefix = self::COUNTRY_MAP[ $country_code ] ?? null;
		if ( $prefix === null ) {
			throw new \RuntimeException(
				// translators: %s is the country code.
				sprintf( esc_html__( 'Unsupported country code for Thunderbird: %s', 'agenticdaisy-calendar' ), esc_html( $country_code ) )
			);
		}

		$url = sprintf( self::URL_TEMPLATE, $prefix );

		$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 !== $code ) {
			throw new \RuntimeException(
				// translators: 1: HTTP status code, 2: country code.
				sprintf( esc_html__( 'Thunderbird returned HTTP %1$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 Thunderbird', 'agenticdaisy-calendar' ) );
		}

		return $body;
	}
}