<?php
/**
 * Move the public chat settings onto the Public Agent key shape.
 *
 * Before this change every public chat setting lived under
 * `publicChat.woocommerce`, and Eventin had a near-identical copy under
 * `publicChat.eventin`. The site shows a single chat widget, so the look and
 * feel is now shared under `publicChat.widget` and only the per-integration
 * behavior stays split, under `publicChat.integrations.<id>`.
 *
 * @package Aisentic
 */

defined( 'ABSPATH' ) || exit;

use Aisentic\Database\Migration;

/**
 * Rewrites the aisentic_settings option. Touches no database table.
 */
// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedClassFound -- Migration_Runner binds the class name to the filename; renaming would re-run the migration.
class Move_Public_Chat_Settings_To_Public_Agent extends Migration {

	/**
	 * Option that holds every plugin setting.
	 *
	 * @var string
	 */
	const OPTION = 'aisentic_settings';

	/**
	 * Keys that describe the one shared widget.
	 *
	 * @var string[]
	 */
	const WIDGET_KEYS = [
		'botName',
		'headline',
		'teaserMessage',
		'brandColor',
		'position',
		'rateLimitPerHour',
		'maxToolCallsPerTurn',
	];

	/**
	 * Keys that stay with each integration.
	 *
	 * @var string[]
	 */
	const INTEGRATION_KEYS = [
		'enabled',
		'recommendedLimit',
		'searchCacheTtlSeconds',
		'outOfScopeMessage',
		'starterPrompts',
	];

	/**
	 * Serial number for execution order.
	 *
	 * @var int
	 */
	protected int $serial = 4;

	/**
	 * Plugin version when this migration was written.
	 *
	 * @var string
	 */
	protected string $version = '1.2.0';

	/**
	 * Move the old keys onto the new shape.
	 *
	 * @return void
	 */
	public function up() {
		$settings = get_option( self::OPTION, null );

		if ( ! is_array( $settings ) || ! isset( $settings['publicChat'] ) || ! is_array( $settings['publicChat'] ) ) {
			return;
		}

		$public_chat = $settings['publicChat'];

		// Already migrated. Never touch a value the site owner has edited since.
		if ( isset( $public_chat['widget'] ) ) {
			return;
		}

		$woocommerce = isset( $public_chat['woocommerce'] ) && is_array( $public_chat['woocommerce'] )
			? $public_chat['woocommerce']
			: [];
		$eventin     = isset( $public_chat['eventin'] ) && is_array( $public_chat['eventin'] )
			? $public_chat['eventin']
			: [];

		if ( ! $woocommerce && ! $eventin ) {
			return;
		}

		/*
		 * WooCommerce wins every shared key: its look-and-feel values are the
		 * only ones the widget ever read, so they are what the site owner
		 * actually saw. Eventin's copies fill in only on a site that never had
		 * WooCommerce.
		 */
		$widget = [];

		foreach ( self::WIDGET_KEYS as $key ) {
			if ( array_key_exists( $key, $woocommerce ) ) {
				$widget[ $key ] = $woocommerce[ $key ];
			} elseif ( array_key_exists( $key, $eventin ) ) {
				$widget[ $key ] = $eventin[ $key ];
			}
		}

		$integrations = [];
		$old_blocks   = [
			'woocommerce' => $woocommerce,
			'eventin'     => $eventin,
		];

		foreach ( $old_blocks as $id => $old ) {
			if ( ! $old ) {
				continue;
			}

			$values = [];

			foreach ( self::INTEGRATION_KEYS as $key ) {
				if ( array_key_exists( $key, $old ) ) {
					$values[ $key ] = $old[ $key ];
				}
			}

			if ( $values ) {
				$integrations[ $id ] = $values;
			}
		}

		unset( $public_chat['woocommerce'], $public_chat['eventin'] );

		if ( $widget ) {
			$public_chat['widget'] = $widget;
		}

		if ( $integrations ) {
			$public_chat['integrations'] = $integrations;
		}

		$settings['publicChat'] = $public_chat;

		update_option( self::OPTION, $settings );
	}

	/**
	 * Put the old key shape back.
	 *
	 * Eventin's own look-and-feel values were dropped by up() because nothing
	 * read them; they are not restored.
	 *
	 * @return void
	 */
	public function down() {
		$settings = get_option( self::OPTION, null );

		if ( ! is_array( $settings ) || ! isset( $settings['publicChat'] ) || ! is_array( $settings['publicChat'] ) ) {
			return;
		}

		$public_chat = $settings['publicChat'];

		if ( ! isset( $public_chat['widget'] ) ) {
			return;
		}

		$widget       = is_array( $public_chat['widget'] ) ? $public_chat['widget'] : [];
		$integrations = isset( $public_chat['integrations'] ) && is_array( $public_chat['integrations'] )
			? $public_chat['integrations']
			: [];

		foreach ( $integrations as $id => $values ) {
			if ( ! is_array( $values ) ) {
				continue;
			}

			// Only WooCommerce ever read the shared keys, so only it gets them back.
			$public_chat[ $id ] = 'woocommerce' === $id
				? array_merge( $values, $widget )
				: $values;
		}

		unset( $public_chat['widget'], $public_chat['integrations'] );

		$settings['publicChat'] = $public_chat;

		update_option( self::OPTION, $settings );
	}
}