<?php
/**
 * Settings.
 *
 * @package Bloatwright
 */

namespace Bloatwright\Services;

/**
 * The bloatwright_settings option.
 */
class Settings {

	/**
	 * Option.
	 */
	const OPTION = 'bloatwright_settings';

	/**
	 * Cached values.
	 *
	 * @var array|null
	 */
	private static $cache = null;

	/**
	 * Defaults.
	 */
	public static function defaults(): array {
		return array(
			'passes'         => 3,
			'timeout'        => 60,
			'urls'           => array(), // Empty = automatic defaults.
			'history'        => 20,
			'cookie_ttl'     => 120,
			'mode'           => 'auto',
			'remote_head'    => false,
			'warmup'         => true,
			'keep_data'      => false,
			'expected_slugs' => array(),
		);
	}

	/**
	 * All settings.
	 */
	public static function get_all(): array {
		if ( null === self::$cache ) {
			$stored      = get_option( self::OPTION, array() );
			self::$cache = array_merge( self::defaults(), is_array( $stored ) ? $stored : array() );
		}
		return self::$cache;
	}

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

	/**
	 * Flush cache.
	 */
	public static function flush(): void {
		self::$cache = null;
	}

	/**
	 * Save defaults when missing.
	 */
	public static function ensure_defaults(): void {
		if ( false === get_option( self::OPTION ) ) {
			update_option( self::OPTION, self::defaults(), false );
		}
		self::flush();
	}

	/**
	 * Update (sanitised).
	 *
	 * @param array $input Input.
	 */
	public static function update( array $input ): array {
		$clean = array_merge( self::get_all(), self::sanitize( $input ) );
		update_option( self::OPTION, $clean, false );
		self::flush();
		return self::get_all();
	}

	/**
	 * Sanitise.
	 *
	 * @param array $input Input.
	 */
	public static function sanitize( array $input ): array {
		$out = array();
		if ( isset( $input['passes'] ) ) {
			$out['passes'] = max( 1, min( 10, (int) $input['passes'] ) );
		}
		if ( isset( $input['timeout'] ) ) {
			$out['timeout'] = max( 10, min( 300, (int) $input['timeout'] ) );
		}
		if ( isset( $input['history'] ) ) {
			$out['history'] = max( 1, min( 100, (int) $input['history'] ) );
		}
		if ( isset( $input['cookie_ttl'] ) ) {
			$out['cookie_ttl'] = max( 30, min( 900, (int) $input['cookie_ttl'] ) );
		}
		if ( isset( $input['mode'] ) ) {
			$out['mode'] = 'browse' === $input['mode'] ? 'browse' : 'auto';
		}
		foreach ( array( 'remote_head', 'warmup', 'keep_data' ) as $b ) {
			if ( isset( $input[ $b ] ) ) {
				$out[ $b ] = rest_sanitize_boolean( $input[ $b ] ); // Form-encoded "false" / "0" are false.
			}
		}
		if ( isset( $input['urls'] ) ) {
			$urls = array();
			foreach ( (array) $input['urls'] as $u ) {
				$u = esc_url_raw( trim( (string) $u ) );
				if ( '' !== $u ) {
					$urls[] = $u;
				}
			}
			$out['urls'] = array_values( array_unique( array_slice( $urls, 0, 20 ) ) );
		}
		if ( isset( $input['expected_slugs'] ) ) {
			$out['expected_slugs'] = array_values( array_filter( array_map( 'sanitize_text_field', (array) $input['expected_slugs'] ) ) );
		}
		return $out;
	}

	/**
	 * Capability.
	 */
	public static function capability(): string {
		return (string) apply_filters( 'bloatwright_capability', 'manage_options' );
	}
}