<?php
/**
 * Non-secret plugin settings (one option).
 *
 * @package AccessNow\Replica
 */

namespace AccessNow\Replica;

defined( 'ABSPATH' ) || exit;

/**
 * Reads and writes accessnow_replica_settings.
 */
final class Settings {

	const OPTION = 'accessnow_replica_settings';

	/**
	 * Defaults. Budgets adapt at runtime; these are starting points.
	 *
	 * @return array<string, mixed>
	 */
	public static function defaults() {
		return array(
			'slice_seconds'   => 0,        // 0 = automatic (20 s local, 15 s elsewhere, below max_execution_time).
			'remote_ms'       => 8000,     // Time a source may spend building one response.
			'remote_bytes'    => 8388608,  // Target bytes per response (8 MB).
			'stmt_bytes'      => 1048576,  // Max bytes per INSERT statement (1 MB).
			'small_file'      => 4194304,  // Files up to this size are sent in batches.
			'range_bytes'     => 8388608,  // Big files are read in ranges of this size.
			'extra_excludes'  => '',       // One pattern per line, relative to wp-content.
			'include_transients' => false,
			'keep_sets'       => 5,        // Pull sets kept per source (0 = keep all).
		);
	}

	/**
	 * All settings merged with 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 setting.
	 *
	 * @param string $key Key.
	 * @return mixed
	 */
	public static function get( $key ) {
		$all = self::all();
		return isset( $all[ $key ] ) ? $all[ $key ] : null;
	}

	/**
	 * Saves sanitised settings.
	 *
	 * @param array $input Raw values.
	 */
	public static function save( array $input ) {
		$current = self::all();
		$clean   = array(
			'slice_seconds'      => isset( $input['slice_seconds'] ) ? max( 0, min( 240, (int) $input['slice_seconds'] ) ) : $current['slice_seconds'],
			'remote_ms'          => isset( $input['remote_ms'] ) ? max( 2000, min( 60000, (int) $input['remote_ms'] ) ) : $current['remote_ms'],
			'remote_bytes'       => isset( $input['remote_bytes'] ) ? max( 1048576, min( 33554432, (int) $input['remote_bytes'] ) ) : $current['remote_bytes'],
			'stmt_bytes'         => isset( $input['stmt_bytes'] ) ? max( 262144, min( 4194304, (int) $input['stmt_bytes'] ) ) : $current['stmt_bytes'],
			'small_file'         => $current['small_file'],
			'range_bytes'        => $current['range_bytes'],
			'extra_excludes'     => isset( $input['extra_excludes'] ) ? sanitize_textarea_field( (string) $input['extra_excludes'] ) : $current['extra_excludes'],
			'include_transients' => ! empty( $input['include_transients'] ),
			'keep_sets'          => isset( $input['keep_sets'] ) ? max( 0, min( 100, (int) $input['keep_sets'] ) ) : $current['keep_sets'],
		);
		update_option( self::OPTION, $clean, false );
	}
}