<?php
/**
 * Plugin settings registration and sanitization.
 *
 * @package BreznFlow
 * @since   1.0.0
 */

namespace BreznFlow\Admin;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Registers the breznflow_settings option and provides default values.
 *
 * @since 1.0.0
 */
class SettingsPage {
	/**
	 * Registers the settings group with WordPress.
	 *
	 * @since  1.0.0
	 * @return void
	 */
	public function register(): void {
		add_action( 'admin_init', array( $this, 'register_settings' ) );
	}

	/**
	 * Registers the breznflow_settings_group with a sanitize callback.
	 *
	 * @since  1.0.0
	 * @return void
	 */
	public function register_settings(): void {
		register_setting(
			'breznflow_settings_group',
			'breznflow_settings',
			array(
				'sanitize_callback' => array( $this, 'sanitize_settings' ),
			)
		);
	}

	/**
	 * Sanitizes the settings array on save.
	 *
	 * @param mixed $input Raw input from the settings form.
	 * @return array Sanitized settings.
	 */
	public function sanitize_settings( $input ): array {
		if ( ! is_array( $input ) ) {
			return self::get_defaults();
		}

		$defaults = self::get_defaults();
		$clean    = array();

		$clean['default_zoom']         = isset( $input['default_zoom'] )
			? max( 10, min( 200, (int) $input['default_zoom'] ) )
			: $defaults['default_zoom'];
		$clean['autofit_threshold']    = isset( $input['autofit_threshold'] )
			? max( 0, min( 500, (int) $input['autofit_threshold'] ) )
			: $defaults['autofit_threshold'];
		$clean['max_code_lines']       = isset( $input['max_code_lines'] )
			? max( 5, min( 500, (int) $input['max_code_lines'] ) )
			: $defaults['max_code_lines'];
		$clean['allow_download']       = ! empty( $input['allow_download'] );
		$clean['download_label']       = isset( $input['download_label'] )
			? sanitize_text_field( wp_unslash( $input['download_label'] ) )
			: $defaults['download_label'];
		$clean['default_mode']         = in_array( $input['default_mode'] ?? '', array( 'visual', 'info', 'compact' ), true )
			? $input['default_mode']
			: $defaults['default_mode'];
		$clean['show_infobox_default'] = ! empty( $input['show_infobox_default'] );
		$clean['show_title_default']   = ! empty( $input['show_title_default'] );
		$clean['schema_howto']         = ! empty( $input['schema_howto'] );
		$clean['related_workflows']    = ! empty( $input['related_workflows'] );
		$clean['view_counting']        = ! empty( $input['view_counting'] );
		$clean['allow_share']          = ! empty( $input['allow_share'] );
		$clean['allow_embed']          = ! empty( $input['allow_embed'] );
		$clean['allow_get_json']       = ! empty( $input['allow_get_json'] );

		$allowed_themes         = \BreznFlow\Features\ThemeRegistry::get_theme_ids();
		$clean['default_theme'] = in_array( $input['default_theme'] ?? '', $allowed_themes, true )
			? $input['default_theme']
			: $defaults['default_theme'];

		// Renderer colors — validate hex format.
		$color_keys               = array( 'trigger', 'action', 'logic', 'transform', 'database', 'ai' );
		$clean['renderer_colors'] = array();
		foreach ( $color_keys as $key ) {
			$raw_color                        = isset( $input['renderer_colors'][ $key ] )
				? sanitize_text_field( wp_unslash( $input['renderer_colors'][ $key ] ) )
				: $defaults['renderer_colors'][ $key ];
			$clean['renderer_colors'][ $key ] = preg_match( '/^#[0-9a-fA-F]{6}$/', $raw_color )
				? $raw_color
				: $defaults['renderer_colors'][ $key ];
		}

		return $clean;
	}

	/**
	 * Returns default settings.
	 *
	 * @return array
	 */
	public static function get_defaults(): array {
		return array(
			'default_zoom'         => 100,
			'autofit_threshold'    => 30,
			'max_code_lines'       => 50,
			'allow_download'       => false,
			'download_label'       => __( 'Download JSON', 'breznflow' ),
			'default_mode'         => 'visual',
			'show_infobox_default' => true,
			'show_title_default'   => true,
			'schema_howto'         => false,
			'related_workflows'    => true,
			'view_counting'        => true,
			'allow_share'          => true,
			'allow_embed'          => false,
			'allow_get_json'       => false,
			'default_theme'        => 'dark',
			'renderer_colors'      => array(
				'trigger'   => '#ff6b6b',
				'action'    => '#4ecdc4',
				'logic'     => '#f39c12',
				'transform' => '#26c6da',
				'database'  => '#4479a1',
				'ai'        => '#7c3aed',
			),
		);
	}
}