<?php
/**
 * Plugin options.
 *
 * @package DropDMS
 */

defined( 'ABSPATH' ) || exit;

/**
 * Reads and sanitizes the options stored in "dropdms_settings".
 */
final class DropDMS_Settings {

	const OPTION = 'dropdms_settings';

	/** OCR languages (data bundled in assets/vendor/tessdata as JSON). */
	const LANGUAGES = array( 'deu+eng', 'deu', 'eng' );

	/** Defaults. */
	public static function defaults() {
		return array(
			'max_upload_mb'      => 20,
			'ocr_lang'           => 'deu+eng',
			'pdf_max_pages'      => 50,
			'search_mode'        => 'like',
			'delete_on_uninstall' => 0,
		);
	}

	/**
	 * All options merged with the defaults.
	 *
	 * @return array<string, mixed>
	 */
	public static function all() {
		$saved = get_option( self::OPTION, array() );

		return array_merge( self::defaults(), is_array( $saved ) ? $saved : array() );
	}

	/**
	 * One option.
	 *
	 * @param string $key Option key.
	 * @return mixed
	 */
	public static function get( $key ) {
		$all = self::all();

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

	/**
	 * Sanitize callback for register_setting().
	 *
	 * @param mixed $input Raw form values.
	 * @return array<string, mixed>
	 */
	public static function sanitize( $input ) {
		$input = is_array( $input ) ? $input : array();
		$out   = self::defaults();

		$out['max_upload_mb'] = min( 2048, max( 1, absint( $input['max_upload_mb'] ?? $out['max_upload_mb'] ) ) );
		$out['pdf_max_pages'] = min( 500, max( 1, absint( $input['pdf_max_pages'] ?? $out['pdf_max_pages'] ) ) );

		$lang            = sanitize_text_field( $input['ocr_lang'] ?? '' );
		$out['ocr_lang'] = in_array( $lang, self::LANGUAGES, true ) ? $lang : 'deu+eng';

		$mode               = sanitize_key( $input['search_mode'] ?? '' );
		$out['search_mode'] = 'fulltext' === $mode ? 'fulltext' : 'like';

		$out['delete_on_uninstall'] = empty( $input['delete_on_uninstall'] ) ? 0 : 1;

		return $out;
	}

	/**
	 * Largest file that can be uploaded: plugin option, PHP limits (wp_max_upload_size) and the database
	 * packet size (see DropDMS_Storage::max_file_size()).
	 */
	public static function max_upload_bytes() {
		return (int) min(
			(int) self::get( 'max_upload_mb' ) * MB_IN_BYTES,
			wp_max_upload_size(),
			DropDMS_Storage::max_file_size()
		);
	}
}