<?php
/**
 * Plugin Name:       Admin Toolbar Live Clock
 * Plugin URI:        https://wordpress.org/plugins/admin-toolbar-live-clock/
 * Description:       Shows a live date & time in the WordPress admin-toolbar with calendar, format, colour, timezone and language controls.
 * Version:           1.0.2
 * Requires at least: 5.2
 * Requires PHP:      7.4
 * Tested up to:      6.8
 * Author:            Amin Raoufi
 * License:           GPL-2.0-or-later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain:       admin-toolbar-live-clock
 * Domain Path:       /languages
 *
 * @package AdminToolbarLiveClock
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Direct access not allowed.
}

/* -------------------------------------------------------------------------- */
/* Constants                                                                  */
/* -------------------------------------------------------------------------- */

define( 'ATLC_OPTION_GROUP', 'atlc_options' );
define( 'ATLC_OPTION_NAME',  'atlc_settings' );
define( 'ATLC_MENU_SLUG',    'admin-toolbar-live-clock' );
define( 'ATLC_DOMAIN',       'admin-toolbar-live-clock' );
define( 'ATLC_VERSION',      '1.0.2' );

/* -------------------------------------------------------------------------- */
/* Defaults & helpers                                                         */
/* -------------------------------------------------------------------------- */

/**
 * Default option values.
 *
 * @return array
 */
function atlc_default_options() {
	return [
		'language'        => 'default',
		'calendar'        => 'gregorian',
		'time_format'     => '24',
		'use_site_tz'     => 1,
		'custom_timezone' => 'UTC',
		'time_color'      => '#2ECC71',
		'date_color'      => '#E74C3C',
		'clickable_clock' => 1,
	];
}

/**
 * Retrieve a single option (with defaults).
 *
 * @param string $key Option key.
 * @return mixed
 */
function atlc_get_option( $key ) {
	$all = wp_parse_args( get_option( ATLC_OPTION_NAME, [] ), atlc_default_options() );
	return $all[ $key ];
}

/**
 * Return the site’s timezone (IANA or UTC±offset).
 *
 * @return string
 */
function atlc_get_site_timezone() {
	$tz_string = get_option( 'timezone_string' );
	if ( $tz_string ) {
		return $tz_string;
	}

	$offset = get_option( 'gmt_offset' );
	if ( ! $offset ) {
		return 'UTC';
	}

	$hours   = floor( $offset );
	$minutes = abs( ( $offset - $hours ) * 60 );

	return sprintf( 'UTC%+03d:%02d', $hours, $minutes );
}

/* -------------------------------------------------------------------------- */
/* Internationalisation                                                       */
/* -------------------------------------------------------------------------- */

/**
 * Scan /languages for available locales.
 *
 * @return array code => label
 */
function atlc_available_languages() {
	static $cache = null;
	if ( null !== $cache ) {
		return $cache;
	}

	$cache = [ 'default' => __( 'Default (Dashboard)', 'admin-toolbar-live-clock' ) ];

	foreach ( glob( plugin_dir_path( __FILE__ ) . 'languages/' . ATLC_DOMAIN . '-*.mo' ) as $file ) {
		$code  = str_replace( [ ATLC_DOMAIN . '-', '.mo' ], '', basename( $file ) );
		$label = '';

		if ( function_exists( 'locale_get_display_language' ) ) {
			$label = locale_get_display_language( $code, $code );
		}

		// Fallback for locales where PHP returns an empty label.
		if ( ! $label ) {
			$map = [
				'hi_IN' => 'हिन्दी',
				'th_TH' => 'ไทย',
			];
			$label = $map[ $code ] ?? $code;
		}

		// Capitalise only Latin labels.
		if ( preg_match( '/^[a-z]/i', $label ) ) {
			$label = ucwords( $label );
		}

		$cache[ $code ] = sprintf( '%s (%s)', $label, $code );
	}

	$cache['en_US'] = $cache['en_US'] ?? 'English (en_US)';
	return $cache;
}

/* Force chosen locale for this text-domain */
add_filter(
	'plugin_locale',
	static function ( $locale, $domain ) {
		if ( ATLC_DOMAIN !== $domain ) {
			return $locale;
		}
		$sel = atlc_get_option( 'language' );
		return ( $sel && 'default' !== $sel ) ? $sel : $locale;
	},
	10,
	2
);

/* Load .mo file after plugins_loaded */
add_action(
	'plugins_loaded',
	static function () {
		$sel = atlc_get_option( 'language' );

		if ( $sel && 'default' !== $sel ) {

			unload_textdomain( ATLC_DOMAIN );

			if ( 'en_US' === $sel ) {
				load_textdomain( ATLC_DOMAIN, false );
				return;
			}

			$mofiles = [
				plugin_dir_path( __FILE__ ) . 'languages/' . ATLC_DOMAIN . "-$sel.mo",
				WP_LANG_DIR . '/plugins/'   . ATLC_DOMAIN . "-$sel.mo",
			];

			foreach ( $mofiles as $mofile ) {
				if ( is_readable( $mofile ) && load_textdomain( ATLC_DOMAIN, $mofile ) ) {
					return;
				}
			}

			load_textdomain( ATLC_DOMAIN, false );
		}
	},
	0
);


/* -------------------------------------------------------------------------- */
/* Sanitisation                                                               */
/* -------------------------------------------------------------------------- */

/**
 * Validate & sanitise settings.
 *
 * @param array $raw Raw options.
 * @return array
 */
function atlc_sanitize_options( $raw ) {
	$clean     = atlc_default_options();
	$raw       = (array) $raw;
	$langs     = array_keys( atlc_available_languages() );
	$calendars = [ 'gregorian', 'persian', 'islamic', 'hebrew', 'buddhist', 'japanese' ];

	if ( isset( $raw['language'] ) && in_array( $raw['language'], $langs, true ) ) {
		$clean['language'] = $raw['language'];
	}
	if ( isset( $raw['calendar'] ) && in_array( $raw['calendar'], $calendars, true ) ) {
		$clean['calendar'] = $raw['calendar'];
	}

	$clean['time_format'] = ( isset( $raw['time_format'] ) && '12' === $raw['time_format'] ) ? '12' : '24';
	$clean['use_site_tz'] = empty( $raw['use_site_tz'] ) ? 0 : 1;
	$clean['clickable_clock'] = empty( $raw['clickable_clock'] ) ? 0 : 1;

	if ( isset( $raw['custom_timezone'] ) && in_array( $raw['custom_timezone'], timezone_identifiers_list(), true ) ) {
		$clean['custom_timezone'] = $raw['custom_timezone'];
	}

	foreach ( [ 'time_color', 'date_color' ] as $c ) {
		if ( $hex = sanitize_hex_color( $raw[ $c ] ?? '' ) ) {
			$clean[ $c ] = strtoupper( $hex );
		}
	}
	return $clean;
}

/* -------------------------------------------------------------------------- */
/* Settings page                                                              */
/* -------------------------------------------------------------------------- */

add_action(
	'admin_menu',
	static function () {
		add_options_page(
			__( 'Admin Toolbar Live Clock', 'admin-toolbar-live-clock' ),
			__( 'Toolbar Clock', 'admin-toolbar-live-clock' ),
			'manage_options',
			ATLC_MENU_SLUG,
			'atlc_render_settings_page'
		);
	}
);

add_action(
	'admin_init',
	static function () {
		register_setting( ATLC_OPTION_GROUP, ATLC_OPTION_NAME, 'atlc_sanitize_options' );
		add_settings_section( 'atlc_main', '', '__return_false', ATLC_MENU_SLUG );

		$fields = [
			'language'        => __( 'Plugin language',     'admin-toolbar-live-clock' ),
			'calendar'        => __( 'Calendar system',     'admin-toolbar-live-clock' ),
			'time_format'     => __( 'Clock format',        'admin-toolbar-live-clock' ),
			'use_site_tz'     => __( 'Use site timezone',   'admin-toolbar-live-clock' ),
			'custom_timezone' => __( 'Custom timezone',     'admin-toolbar-live-clock' ),
			'time_color'      => __( 'Clock colour',        'admin-toolbar-live-clock' ),
			'date_color'      => __( 'Date colour',         'admin-toolbar-live-clock' ),
			'clickable_clock' => __( 'Make clock clickable', 'admin-toolbar-live-clock' ),
		];

		foreach ( $fields as $id => $label ) {
			add_settings_field( $id, $label, "atlc_field_{$id}", ATLC_MENU_SLUG, 'atlc_main' );
		}
	}
);

/* ---------- field callbacks ----------- */

function atlc_field_language() {
	$val = atlc_get_option( 'language' ); ?>
	<select name="<?php echo esc_attr( ATLC_OPTION_NAME . '[language]' ); ?>" style="min-width:220px;">
		<?php foreach ( atlc_available_languages() as $code => $label ) : ?>
			<option value="<?php echo esc_attr( $code ); ?>" <?php selected( $val, $code ); ?>>
				<?php echo esc_html( $label ); ?>
			</option>
		<?php endforeach; ?>
	</select>
<?php }

function atlc_field_calendar() {
	$val = atlc_get_option( 'calendar' );
	$items = [
		'gregorian' => __( 'Gregorian',         'admin-toolbar-live-clock' ),
		'persian'   => __( 'Jalali (Persian)',  'admin-toolbar-live-clock' ),
		'islamic'   => __( 'Hijri (Islamic)',   'admin-toolbar-live-clock' ),
		'hebrew'    => __( 'Hebrew',            'admin-toolbar-live-clock' ),
		'buddhist'  => __( 'Buddhist (Thai)',   'admin-toolbar-live-clock' ),
		'japanese'  => __( 'Japanese',          'admin-toolbar-live-clock' ),
	];
	?>
	<select name="<?php echo esc_attr( ATLC_OPTION_NAME . '[calendar]' ); ?>">
		<?php foreach ( $items as $code => $label ) : ?>
			<option value="<?php echo esc_attr( $code ); ?>" <?php selected( $val, $code ); ?>>
				<?php echo esc_html( $label ); ?>
			</option>
		<?php endforeach; ?>
	</select>
<?php }

function atlc_field_time_format() {
	$val   = atlc_get_option( 'time_format' );
	$items = [
		'24' => __( '24-hour',     'admin-toolbar-live-clock' ),
		'12' => __( '12-hour AM/PM', 'admin-toolbar-live-clock' ),
	]; ?>
	<select name="<?php echo esc_attr( ATLC_OPTION_NAME . '[time_format]' ); ?>">
		<?php foreach ( $items as $code => $label ) : ?>
			<option value="<?php echo esc_attr( $code ); ?>" <?php selected( $val, $code ); ?>>
				<?php echo esc_html( $label ); ?>
			</option>
		<?php endforeach; ?>
	</select>
<?php }

function atlc_field_use_site_tz() { ?>
	<input type="checkbox"
		name="<?php echo esc_attr( ATLC_OPTION_NAME . '[use_site_tz]' ); ?>"
		value="1" <?php checked( atlc_get_option( 'use_site_tz' ) ); ?> />
<?php }

function atlc_field_custom_timezone() {
	$val = atlc_get_option( 'custom_timezone' ); ?>
	<select id="atlc-tz-select" name="<?php echo esc_attr( ATLC_OPTION_NAME . '[custom_timezone]' ); ?>">
		<?php foreach ( timezone_identifiers_list() as $tz ) : ?>
			<option value="<?php echo esc_attr( $tz ); ?>" <?php selected( $val, $tz ); ?>>
				<?php echo esc_html( $tz ); ?>
			</option>
		<?php endforeach; ?>
	</select>
<?php }

function atlc_field_clickable_clock() { ?>
	<input type="checkbox"
		name="<?php echo esc_attr( ATLC_OPTION_NAME . '[clickable_clock]' ); ?>"
		value="1" <?php checked( atlc_get_option( 'clickable_clock' ) ); ?> />
<?php }

function atlc_color_picker_input( $key ) {
	printf(
		'<input type="text" class="atlc-color-field" name="%1$s[%2$s]" value="%3$s" data-default-color="%3$s" />',
		esc_attr( ATLC_OPTION_NAME ),
		esc_attr( $key ),
		esc_attr( atlc_get_option( $key ) )
	);
}
function atlc_field_time_color() { atlc_color_picker_input( 'time_color' ); }
function atlc_field_date_color() { atlc_color_picker_input( 'date_color' ); }

/**
 * Render settings page.
 */
function atlc_render_settings_page() { ?>
	<div class="wrap" id="atlc-settings">
		<h1><?php esc_html_e( 'Admin Toolbar Live Clock', 'admin-toolbar-live-clock' ); ?></h1>
		<p class="subtitle"><?php esc_html_e( 'Personalise how date & time appear in your admin-toolbar.', 'admin-toolbar-live-clock' ); ?></p>

		<form method="post" action="options.php">
			<?php
			settings_fields( ATLC_OPTION_GROUP );
			do_settings_sections( ATLC_MENU_SLUG );
			submit_button( __( 'Save Changes', 'admin-toolbar-live-clock' ) );
			?>
		</form>

		<p id="atlc-credit">© Amin Raoufi · <?php echo esc_html( gmdate( 'Y' ) ); ?></p>
	</div>
<?php }

/* -------------------------------------------------------------------------- */
/* Assets                                                                     */
/* -------------------------------------------------------------------------- */

add_action(
	'admin_enqueue_scripts',
	static function ( $hook ) {

		/* Settings page assets */
		if ( 'settings_page_' . ATLC_MENU_SLUG === $hook ) {
			wp_enqueue_style( 'wp-color-picker' );
			wp_enqueue_script(
				'atlc-admin',
				plugins_url( 'atlc-admin.js', __FILE__ ),
				[ 'jquery', 'wp-color-picker' ],
				ATLC_VERSION,
				true
			);

			wp_enqueue_style(
			    'atlc-admin-css',
				plugins_url( 'atlc-admin.css', __FILE__ ),
				[],
				ATLC_VERSION
			);
		}

		/* Clock – all admin screens */
		wp_enqueue_script(
			'atlc-clock',
			plugins_url( 'atlc.js', __FILE__ ),
			[ 'jquery', 'wp-i18n' ],
			ATLC_VERSION,
			true
		);
		wp_localize_script(
			'atlc-clock',
			'ATLC_DATA',
			[
				'time_format' => atlc_get_option( 'time_format' ),
				'calendar'    => atlc_get_option( 'calendar' ),
				'time_color'  => atlc_get_option( 'time_color' ),
				'date_color'  => atlc_get_option( 'date_color' ),
				'timezone'    => atlc_get_site_timezone(),
			]
		);
	}
);

/* -------------------------------------------------------------------------- */
/* Toolbar node                                                               */
/* -------------------------------------------------------------------------- */

/**
 * Format date/time for different calendars.
 *
 * @param DateTime $dt      DateTime object.
 * @param string   $cal     Calendar key.
 * @param string   $pattern Time format (e.g. H:i:s A).
 * @return string
 */
function atlc_format_datetime( DateTime $dt, $cal, $pattern ) {
	if ( 'gregorian' === $cal ) {
		return $dt->format( $pattern . ' Y-m-d' );
	}

	if ( class_exists( 'IntlDateFormatter' ) ) {
		$map = [
			'persian'  => 'fa_IR@calendar=persian',
			'islamic'  => 'ar_SA@calendar=islamic',
			'hebrew'   => 'he_IL@calendar=hebrew',
			'buddhist' => 'th_TH@calendar=buddhist',
			'japanese' => 'ja_JP@calendar=japanese',
		];
		$locale = $map[ $cal ] ?? get_locale();

		$fmt = new IntlDateFormatter(
			$locale,
			IntlDateFormatter::NONE,
			IntlDateFormatter::NONE,
			$dt->getTimezone()->getName(),
			IntlDateFormatter::TRADITIONAL,
			$pattern . ' yyyy-MM-dd'
		);
		return $fmt->format( $dt );
	}

	return $dt->format( $pattern . ' Y-m-d' );
}

add_action(
	'admin_bar_menu',
	static function ( WP_Admin_Bar $bar ) {
		if ( ! current_user_can( 'manage_options' ) ) {
			return;
		}

		$tz = atlc_get_option( 'use_site_tz' )
			? atlc_get_site_timezone()
			: atlc_get_option( 'custom_timezone' );

		$pattern = ( '12' === atlc_get_option( 'time_format' ) ) ? 'h:i:s A' : 'H:i:s';

		$now   = new DateTime( 'now', new DateTimeZone( $tz ) );
		$label = atlc_format_datetime( $now, atlc_get_option( 'calendar' ), $pattern );
		
		$clock_html = esc_html( $label );
		
		if ( atlc_get_option( 'clickable_clock' ) ) {
			$clock_html = sprintf(
			    '<a href="%s" id="atlc-clock" style="text-decoration:none;">%s</a>',
				esc_url( admin_url( 'options-general.php?page=' . ATLC_MENU_SLUG ) ),
				$clock_html
			);
		} else {
			$clock_html = sprintf(
			    '<span id="atlc-clock">%s</span>',
				$clock_html
			);
		}

		$bar->add_node(
			[
				'id'     => 'atlc-node',
				'parent' => 'top-secondary',
				'title' => $clock_html,
			]
		);
	},
	999
);

/* -------------------------------------------------------------------------- */
/* Force English when user selects “en_US”                                    */
/* -------------------------------------------------------------------------- */
add_filter(
	'gettext',
	static function ( $translated, $text, $domain ) {
		if ( ATLC_DOMAIN === $domain && 'en_US' === atlc_get_option( 'language' ) ) {
			return $text;
		}
		return $translated;
	},
	10,
	3
);

/* -------------------------------------------------------------------------- */
/* Add “Settings” link in plugin list                                         */
/* -------------------------------------------------------------------------- */

add_filter(
	'plugin_action_links_' . plugin_basename(__FILE__),
	static function ( $links ) {
		if ( current_user_can( 'manage_options' ) ) {
			$settings_link = sprintf(
				'<a href="%s">%s</a>',
				esc_url( admin_url( 'options-general.php?page=' . ATLC_MENU_SLUG ) ),
				esc_html__( 'Settings', 'admin-toolbar-live-clock' )
			);
			array_unshift( $links, $settings_link );
		}
		return $links;
	}
);