<?php
/**
 * Asset registration and enqueue logic.
 *
 * @package Plectrum
 */

namespace DA_Plectrum;

defined( 'ABSPATH' ) || exit;

/**
 * Registers and conditionally enqueues plugin assets.
 */
class Assets {
	/**
	 * Whether frontend assets are needed on the current request.
	 *
	 * @var bool
	 */
	private $should_enqueue_frontend = false;

	/**
	 * Frontend tuning keys requested on the current page.
	 *
	 * @var array<int, string>
	 */
	private $requested_tunings = array();

	/**
	 * Mark frontend assets for enqueue.
	 *
	 * @return void
	 */
	public function mark_frontend_required() {
		$this->should_enqueue_frontend = true;
	}

	/**
	 * Mark a tuning as needed for front-end rendering.
	 *
	 * @param string $tuning Tuning key.
	 * @return void
	 */
	public function mark_tuning_required( $tuning ) {
		$tuning = '' !== $tuning ? $tuning : 'gCEA';

		if ( ! in_array( $tuning, $this->requested_tunings, true ) ) {
			$this->requested_tunings[] = $tuning;
		}
	}

	/**
	 * Register frontend assets and enqueue when needed.
	 *
	 * @return void
	 */
	public function register_frontend_assets() {
		wp_register_style(
			'da-plectrum-frontend',
			DA_PLECTRUM_PLUGIN_URL . 'assets/css/frontend.css',
			array(),
			DA_PLECTRUM_PLUGIN_VERSION
		);

		wp_register_style(
			'da-plectrum-print',
			DA_PLECTRUM_PLUGIN_URL . 'assets/css/print.css',
			array( 'da-plectrum-frontend' ),
			DA_PLECTRUM_PLUGIN_VERSION,
			'print'
		);

		wp_register_script(
			'da-plectrum-chord-diagram',
			DA_PLECTRUM_PLUGIN_URL . 'assets/js/chord-diagram.js',
			array(),
			DA_PLECTRUM_PLUGIN_VERSION,
			true
		);

		wp_register_script(
			'da-plectrum-transpose',
			DA_PLECTRUM_PLUGIN_URL . 'assets/js/transpose.js',
			array( 'da-plectrum-chord-diagram' ),
			DA_PLECTRUM_PLUGIN_VERSION,
			true
		);

		wp_register_script(
			'da-plectrum-frontend',
			DA_PLECTRUM_PLUGIN_URL . 'assets/js/frontend.js',
			array( 'da-plectrum-chord-diagram', 'da-plectrum-transpose' ),
			DA_PLECTRUM_PLUGIN_VERSION,
			true
		);

		if ( ! apply_filters( 'da_plectrum_should_enqueue_assets', $this->should_enqueue_frontend ) ) {
			return;
		}

		wp_enqueue_style( 'da-plectrum-frontend' );
		wp_enqueue_style( 'da-plectrum-print' );
		wp_enqueue_script( 'da-plectrum-chord-diagram' );
		wp_enqueue_script( 'da-plectrum-transpose' );
		wp_enqueue_script( 'da-plectrum-frontend' );

		wp_add_inline_script(
			'da-plectrum-chord-diagram',
			'window.daPlectrumConfig = ' . wp_json_encode(
				array(
					'textDomain' => DA_PLECTRUM_TEXT_DOMAIN,
					'libraries'  => $this->get_frontend_libraries(),
					'i18n'       => array(
						/* translators: %s: Chord name used in the chord diagram label. */
						'diagramLabelTemplate'   => __( '%s ukulele chord diagram', 'plectrum' ),
						'displaySizeUpdated'     => __( 'Display size updated.', 'plectrum' ),
						'displaySizeReset'       => __( 'Display size reset.', 'plectrum' ),
						'printDialogOpened'      => __( 'Print dialog opened.', 'plectrum' ),
						'diagramsShown'          => __( 'Chord diagrams shown.', 'plectrum' ),
						'diagramsHidden'         => __( 'Chord diagrams hidden.', 'plectrum' ),
						'showDiagrams'           => __( 'Show Diagrams', 'plectrum' ),
						'hideDiagrams'           => __( 'Hide Diagrams', 'plectrum' ),
						'transpositionReset'     => __( 'Transposition reset.', 'plectrum' ),
						'transpositionDirection' => array(
							'up'   => __( 'up', 'plectrum' ),
							'down' => __( 'down', 'plectrum' ),
						),
						/* translators: 1: Direction, 2: semitone count, 3: semitone label. */
						'transpositionTemplate'  => __( 'Transposed %1$s %2$d %3$s.', 'plectrum' ),
						'semitoneSingular'       => __( 'semitone', 'plectrum' ),
						'semitonePlural'         => __( 'semitones', 'plectrum' ),
					),
				)
			) . ';',
			'before'
		);
	}

	/**
	 * Register admin assets.
	 *
	 * @return void
	 */
	public function register_admin_assets() {
		wp_register_style(
			'da-plectrum-admin',
			DA_PLECTRUM_PLUGIN_URL . 'assets/css/admin.css',
			array(),
			DA_PLECTRUM_PLUGIN_VERSION
		);

		wp_register_script(
			'da-plectrum-admin',
			DA_PLECTRUM_PLUGIN_URL . 'assets/js/admin.js',
			array(),
			DA_PLECTRUM_PLUGIN_VERSION,
			true
		);
	}

	/**
	 * Enqueue settings page assets.
	 *
	 * @return void
	 */
	public function enqueue_admin_assets() {
		wp_enqueue_style( 'da-plectrum-admin' );
		wp_enqueue_script( 'da-plectrum-admin' );
	}

	/**
	 * Get normalized chord libraries for requested tunings.
	 *
	 * @return array<string, array<string, array<string, mixed>>>
	 */
	private function get_frontend_libraries() {
		$tunings   = ! empty( $this->requested_tunings ) ? $this->requested_tunings : array( 'gCEA' );
		$libraries = array();

		foreach ( $tunings as $tuning ) {
			$libraries[ $tuning ] = da_plectrum_get_chord_library_map( $tuning );
		}

		return $libraries;
	}
}