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<?php

/**
 * Helper class for font settings.
 *
 * @class   FLBuilderFonts
 * @since   1.6.3
 */
final class FLBuilderTimezones {

/**
	 * An array of continents.
	 * @var array
	 */
	static private $continents = array( 'Africa', 'America', 'Antarctica', 'Arctic', 'Asia', 'Atlantic', 'Australia', 'Europe', 'Indian', 'Pacific');

/**
	 * Generates a list of timezones.
	 *
	 * @since 1.6.5
	 *
	 * @var bool $mo_loaded
	 *
	 * @param string $selected_zone Selected timezone.
	 * @return string
	 */
	static public function build_timezones( $selected_zone ) {
		static $mo_loaded = false;

$continents = array( 'Africa', 'America', 'Antarctica', 'Arctic', 'Asia', 'Atlantic', 'Australia', 'Europe', 'Indian', 'Pacific');

// Load translations for continents and cities
		if ( !$mo_loaded ) {
			$locale = get_locale();
			$mofile = WP_LANG_DIR . '/continents-cities-' . $locale . '.mo';
			load_textdomain( 'continents-cities', $mofile );
			$mo_loaded = true;
		}

$zonen = array();
		foreach ( timezone_identifiers_list() as $zone ) {
			$zone = explode( '/', $zone );
			if ( !in_array( $zone[0], $continents ) ) {
				continue;
			}

// This determines what gets set and translated - we don't translate Etc/* strings here, they are done later
			$exists = array(
				0 => ( isset( $zone[0] ) && $zone[0] ),
				1 => ( isset( $zone[1] ) && $zone[1] ),
				2 => ( isset( $zone[2] ) && $zone[2] ),
			);
			$exists[3] = ( $exists[0] && 'Etc' !== $zone[0] );
			$exists[4] = ( $exists[1] && $exists[3] );
			$exists[5] = ( $exists[2] && $exists[3] );

$zonen[] = array(
				'continent'   => ( $exists[0] ? $zone[0] : '' ),
				'city'        => ( $exists[1] ? $zone[1] : '' ),
				'subcity'     => ( $exists[2] ? $zone[2] : '' ),
				't_continent' => ( $exists[3] ? translate( str_replace( '_', ' ', $zone[0] ), 'continents-cities' ) : '' ),
				't_city'      => ( $exists[4] ? translate( str_replace( '_', ' ', $zone[1] ), 'continents-cities' ) : '' ),
				't_subcity'   => ( $exists[5] ? translate( str_replace( '_', ' ', $zone[2] ), 'continents-cities' ) : '' )
			);
		}
		usort( $zonen, '_wp_timezone_choice_usort_callback' );

$structure = array();

if ( empty( $selected_zone ) ) {
			$structure[] = '<option selected="selected" value="">' . __( 'Select a city', 'fl-builder' ) . '</option>';
		}

foreach ( $zonen as $key => $zone ) {
			// Build value in an array to join later
			$value = array( $zone['continent'] );

if ( empty( $zone['city'] ) ) {
				// It's at the continent level (generally won't happen)
				$display = $zone['t_continent'];
			} else {
				// It's inside a continent group

// Continent optgroup
				if ( !isset( $zonen[$key - 1] ) || $zonen[$key - 1]['continent'] !== $zone['continent'] ) {
					$label = $zone['t_continent'];
					$structure[] = '<optgroup label="'. esc_attr( $label ) .'">';
				}

// Add the city to the value
				$value[] = $zone['city'];

$display = $zone['t_city'];
				if ( !empty( $zone['subcity'] ) ) {
					// Add the subcity to the value
					$value[] = $zone['subcity'];
					$display .= ' - ' . $zone['t_subcity'];
				}
			}

// Build the value
			$value = join( '/', $value );
			$selected = '';
			if ( $value === $selected_zone ) {
				$selected = 'selected="selected" ';
			}
			$structure[] = '<option ' . $selected . 'value="' . esc_attr( $value ) . '">' . esc_html( $display ) . "</option>";

// Close continent optgroup
			if ( !empty( $zone['city'] ) && ( !isset($zonen[$key + 1]) || (isset( $zonen[$key + 1] ) && $zonen[$key + 1]['continent'] !== $zone['continent']) ) ) {
				$structure[] = '</optgroup>';
			}
		}

// Do UTC
		$structure[] = '<optgroup label="'. esc_attr__( 'UTC', 'fl-builder' ) .'">';
		$selected = '';
		if ( 'UTC' === $selected_zone )
			$selected = 'selected="selected" ';
		$structure[] = '<option ' . $selected . 'value="' . esc_attr( 'UTC', 'fl-builder' ) . '">' . __( 'UTC', 'fl-builder' ) . '</option>';
		$structure[] = '</optgroup>';

return join( "\n", $structure );
	}

}