<?php
/**
 * Plugin settings and their defaults.
 *
 * @package Barcodegen
 */

defined( 'ABSPATH' ) || exit;

/**
 * Stores and exposes the plugin defaults.
 */
class BCGN_Settings {

	const OPTION = 'bcgn_options';

	/**
	 * Cached option values.
	 *
	 * @var array<string,mixed>|null
	 */
	protected static $cache = null;

	/**
	 * Register hooks.
	 */
	public static function init() {
		add_action( 'admin_init', array( __CLASS__, 'register_settings' ) );
	}

	/**
	 * Default values.
	 *
	 * @return array<string,mixed>
	 */
	public static function defaults() {
		return array(
			'default_format' => 'code128',
			'scale'          => 2,
			'height'         => 60,
			'text'           => 1,
			'bar_color'      => '#000000',
			'bg_color'       => 'transparent',
			'credit'         => 0,
			'credit_text'    => '',
		);
	}

	/**
	 * Read all settings, merged with defaults.
	 *
	 * @return array<string,mixed>
	 */
	public static function all() {
		if ( null === self::$cache ) {
			$stored      = get_option( self::OPTION, array() );
			self::$cache = wp_parse_args( is_array( $stored ) ? $stored : array(), self::defaults() );
		}

		return self::$cache;
	}

	/**
	 * Read one setting.
	 *
	 * @param string $key Setting key.
	 * @return mixed
	 */
	public static function get( $key ) {
		$all = self::all();

		return isset( $all[ $key ] ) ? $all[ $key ] : null;
	}

	/**
	 * Register the settings screen fields.
	 */
	public static function register_settings() {
		register_setting(
			'bcgn_settings',
			self::OPTION,
			array(
				'type'              => 'array',
				'sanitize_callback' => array( __CLASS__, 'sanitize' ),
				'default'           => self::defaults(),
			)
		);
	}

	/**
	 * Sanitize every submitted value.
	 *
	 * @param mixed $input Raw settings.
	 * @return array<string,mixed>
	 */
	public static function sanitize( $input ) {
		$input   = is_array( $input ) ? $input : array();
		$clean   = self::defaults();
		$formats = BCGN_Barcode::formats();

		if ( isset( $input['default_format'] ) && isset( $formats[ $input['default_format'] ] ) ) {
			$clean['default_format'] = $input['default_format'];
		}

		if ( isset( $input['scale'] ) ) {
			$clean['scale'] = (string) max( 0.5, min( 10, (float) $input['scale'] ) );
		}

		if ( isset( $input['height'] ) ) {
			$clean['height'] = (int) max( 10, min( 400, (int) $input['height'] ) );
		}

		$clean['text'] = empty( $input['text'] ) ? 0 : 1;

		if ( isset( $input['bar_color'] ) ) {
			$clean['bar_color'] = BCGN_SVG::color( $input['bar_color'], '#000000' );
		}

		if ( isset( $input['bg_color'] ) ) {
			$clean['bg_color'] = BCGN_SVG::color( $input['bg_color'], 'transparent' );
		}

		$clean['credit'] = empty( $input['credit'] ) ? 0 : 1;

		$clean['credit_text'] = isset( $input['credit_text'] )
			? sanitize_text_field( $input['credit_text'] )
			: '';

		self::$cache = $clean;

		return $clean;
	}
}