<?php
/**
 * Settings storage.
 *
 * @package A11yMate
 */

namespace A11yMate;

defined( 'ABSPATH' ) || exit;

/**
 * One option holds everything, merged over defaults and sanitised on the way in.
 */
class Settings {

	const OPTION = 'a11ymate_settings';

	/**
	 * Default settings.
	 *
	 * @return array
	 */
	public static function defaults() {
		return array(
			'post_types'          => array( 'post', 'page' ),
			'max_pages'           => 0,
			'exclude_paths'       => '',
			'sample_archives'     => 5,
			'categories'          => array( 'images', 'structure', 'links', 'forms', 'aria', 'media', 'colour', 'typography', 'interaction', 'content' ),
			'wcag_target'         => 'AA',
			'show_needs_review'   => 1,
			'capability'          => 'manage_options',
			'delete_on_uninstall' => 0,
			'editor_require'      => 0,
			'safe_fixes'          => array(
				'skip_link'        => 0,
				'pinch_zoom'       => 0,
				'focus_ring'       => 0,
				'new_tab_text'     => 0,
				'iframe_titles'    => 0,
				'reduced_motion'   => 0,
				'underline_links'  => 0,
				'lang'             => 0,
				'tabindex'         => 0,
				'alt_from_library' => 0,
				'focus_colour'     => '#1F5C8B',
			),
		);
	}

	/**
	 * Get all settings.
	 *
	 * @return array
	 */
	public static function all() {
		$saved = get_option( self::OPTION, array() );
		if ( ! is_array( $saved ) ) {
			$saved = array();
		}
		$defaults = self::defaults();
		$merged = array_merge( $defaults, $saved );
		foreach ( array( 'safe_fixes', 'toolbar' ) as $group ) {
			if ( isset( $defaults[ $group ] ) ) {
				$merged[ $group ] = array_merge( $defaults[ $group ], isset( $saved[ $group ] ) && is_array( $saved[ $group ] ) ? $saved[ $group ] : array() );
			}
		}
		return $merged;
	}

	/**
	 * Move installs that still have the retired cobalt default (#2A3BFF) for the safe-fix focus colour to
	 * the brand blue. A colour someone chose themselves is left alone.
	 *
	 * @return void
	 */
	public static function migrate_brand() {
		$saved = get_option( self::OPTION, null );
		if ( ! is_array( $saved ) ) {
			return;
		}
		$before = $saved;
		if ( isset( $saved['safe_fixes']['focus_colour'] ) && is_string( $saved['safe_fixes']['focus_colour'] ) && '#2a3bff' === strtolower( $saved['safe_fixes']['focus_colour'] ) ) {
			$saved['safe_fixes']['focus_colour'] = '#1F5C8B';
		}
		if ( $saved !== $before ) {
			update_option( self::OPTION, $saved, false );
		}
	}

	/**
	 * Get one setting.
	 *
	 * @param string $key     Key.
	 * @param mixed  $fallback Fallback.
	 * @return mixed
	 */
	public static function get( $key, $fallback = null ) {
		$all = self::all();
		return array_key_exists( $key, $all ) ? $all[ $key ] : $fallback;
	}

	/**
	 * Capability needed to use A11yMate.
	 *
	 * @return string
	 */
	public static function capability() {
		$cap = self::get( 'capability', 'manage_options' );
		$cap = is_string( $cap ) && '' !== $cap ? $cap : 'manage_options';
		return (string) apply_filters( 'a11ymate_capability', $cap );
	}

	/**
	 * Merge, sanitise and store a partial update.
	 *
	 * @param array $input Raw input.
	 * @return array The saved settings.
	 */
	public static function update( array $input ) {
		$current = self::all();
		$clean   = self::sanitize( $input, $current );
		update_option( self::OPTION, $clean, false );
		return $clean;
	}

	/**
	 * Sanitise input over the current settings.
	 *
	 * @param array $in      Input.
	 * @param array $current Current settings.
	 * @return array
	 */
	public static function sanitize( array $in, array $current ) {
		$out = $current;

		if ( isset( $in['post_types'] ) && is_array( $in['post_types'] ) ) {
			$valid             = array_keys( get_post_types( array( 'public' => true ) ) );
			$out['post_types'] = array_values( array_intersect( array_map( 'sanitize_key', $in['post_types'] ), $valid ) );
		}
		if ( isset( $in['max_pages'] ) ) {
			$out['max_pages'] = max( 0, min( 100000, (int) $in['max_pages'] ) );
		}
		if ( isset( $in['exclude_paths'] ) ) {
			$lines                = preg_split( '/\R/', (string) $in['exclude_paths'] );
			$lines                = array_filter( array_map( 'sanitize_text_field', $lines ) );
			$out['exclude_paths'] = implode( "\n", $lines );
		}
		if ( isset( $in['sample_archives'] ) ) {
			$out['sample_archives'] = max( 0, min( 20, (int) $in['sample_archives'] ) );
		}
		if ( isset( $in['categories'] ) && is_array( $in['categories'] ) ) {
			$valid             = self::defaults()['categories'];
			$out['categories'] = array_values( array_intersect( array_map( 'sanitize_key', $in['categories'] ), $valid ) );
		}
		if ( isset( $in['wcag_target'] ) ) {
			$out['wcag_target'] = in_array( $in['wcag_target'], array( 'A', 'AA', 'AAA' ), true ) ? $in['wcag_target'] : 'AA';
		}
		foreach ( array( 'show_needs_review', 'delete_on_uninstall', 'editor_require' ) as $flag ) {
			if ( isset( $in[ $flag ] ) ) {
				$out[ $flag ] = $in[ $flag ] ? 1 : 0;
			}
		}
		if ( isset( $in['capability'] ) ) {
			$cap               = sanitize_key( (string) $in['capability'] );
			$out['capability'] = in_array( $cap, array( 'manage_options', 'edit_pages', 'edit_others_posts', 'edit_posts' ), true ) ? $cap : 'manage_options';
		}
		if ( isset( $in['safe_fixes'] ) && is_array( $in['safe_fixes'] ) ) {
			foreach ( $current['safe_fixes'] as $k => $v ) {
				if ( ! isset( $in['safe_fixes'][ $k ] ) ) {
					continue;
				}
				if ( 'focus_colour' === $k ) {
					$c                       = sanitize_hex_color( (string) $in['safe_fixes'][ $k ] );
					$out['safe_fixes'][ $k ] = $c ? $c : '#1F5C8B';
				} else {
					$out['safe_fixes'][ $k ] = $in['safe_fixes'][ $k ] ? 1 : 0;
				}
			}
		}
		return $out;
	}
}