<?php
/**
 * Plugin activation / deactivation routines.
 *
 * @package SixRsh_WhatsApp
 */

defined( 'ABSPATH' ) || exit;

/**
 * Class SixRsh_Activator
 */
class SixRsh_Activator {

	/**
	 * Run on plugin activation.
	 *
	 * Creates custom DB tables and sets the wizard redirect transient.
	 *
	 * @return void
	 */
	public static function activate(): void {
		try {
			self::create_tables();
			update_option( 'sixrsh_db_version', defined( 'SIXRSH_DB_VERSION' ) ? SIXRSH_DB_VERSION : '1' );
			// Adopt settings from the legacy 6rsh-whatsapp plugin (idempotent).
			self::migrate_legacy_settings();
			// Trigger wizard redirect — 10-minute TTL.
			set_transient( 'sixrsh_wizard_redirect', '1', 10 * MINUTE_IN_SECONDS );
		} catch ( \Throwable $e ) {
			error_log( '[6rsh WhatsApp] Activator::activate exception: ' . $e->getMessage() );
		}
	}

	/**
	 * Run schema upgrades on plugin update (the activation hook does not fire on
	 * an in-place "replace current with uploaded" update). Idempotent — dbDelta
	 * only applies the diff. Called from plugins_loaded.
	 *
	 * @return void
	 */
	public static function maybe_upgrade(): void {
		try {
			$current = defined( 'SIXRSH_DB_VERSION' ) ? SIXRSH_DB_VERSION : '1';
			if ( get_option( 'sixrsh_db_version' ) === $current ) {
				return;
			}
			self::create_tables();
			update_option( 'sixrsh_db_version', $current );
		} catch ( \Throwable $e ) {
			error_log( '[6rsh WhatsApp] Activator::maybe_upgrade exception: ' . $e->getMessage() );
		}
	}

	/**
	 * Adopt settings saved by the legacy "6rsh-whatsapp" plugin so a store keeps
	 * its API key and configuration after switching to this renamed plugin.
	 *
	 * The renamed plugin keeps the SAME `sixrsh_*` option namespace as the legacy
	 * plugin, so options written by 6rsh-whatsapp are read directly with no key
	 * change. This pass runs once, is idempotent, and NEVER overwrites a value the
	 * new install has already set — it only fills a key that is currently absent.
	 *
	 * NOTE: if the old plugin is *deleted* (not just deactivated) its uninstall.php
	 * removes the `sixrsh_*` options first — in that case there is nothing left to
	 * adopt. Safe order: deactivate old → install + activate new → verify → delete old.
	 *
	 * @return void
	 */
	public static function migrate_legacy_settings(): void {
		try {
			if ( get_option( 'sixrsh_settings_migrated' ) ) {
				return; // already done
			}

			// Legacy option keys written by the 6rsh-whatsapp plugin.
			$keys = array(
				'sixrsh_api_key',
				'sixrsh_connected_account',
				'sixrsh_connected_phone',
				'sixrsh_template_mapping',
				'sixrsh_settings',
				'sixrsh_country_code',
				'sixrsh_order_sync_enabled',
				'sixrsh_product_sync_enabled',
				'sixrsh_followup_rule_1',
				'sixrsh_followup_rule_2',
				'sixrsh_wizard_complete',
			);

			$adopted = array();
			foreach ( $keys as $key ) {
				$legacy = get_option( $key, null );
				// Same-namespace adoption: a legacy value is already stored under
				// this exact key, so the new plugin reads it as-is. Record it for
				// auditing; do not overwrite if somehow already managed elsewhere.
				if ( null !== $legacy && false !== $legacy ) {
					$adopted[] = $key;
				}
			}

			if ( ! empty( $adopted ) ) {
				error_log( '[6rsh] Adopted legacy settings from 6rsh-whatsapp: ' . implode( ', ', $adopted ) );
			}

			update_option( 'sixrsh_settings_migrated', defined( 'SIXRSH_VERSION' ) ? SIXRSH_VERSION : '1.4.0' );
		} catch ( \Throwable $e ) {
			error_log( '[6rsh] Activator::migrate_legacy_settings exception: ' . $e->getMessage() );
		}
	}

	/**
	 * Check if we should redirect to the wizard on admin_init.
	 *
	 * @return void
	 */
	public static function check_redirect(): void {
		try {
			if ( ! is_admin() ) {
				return;
			}
			if ( wp_doing_ajax() ) {
				return;
			}
			if ( get_option( 'sixrsh_wizard_complete' ) ) {
				return;
			}
			if ( ! get_transient( 'sixrsh_wizard_redirect' ) ) {
				return;
			}

			delete_transient( 'sixrsh_wizard_redirect' );

			$wizard_url = admin_url( 'admin.php?page=6rsh-messaging-notifications&setup=1' );
			wp_safe_redirect( $wizard_url );
			exit;

		} catch ( \Throwable $e ) {
			error_log( '[6rsh WhatsApp] Activator::check_redirect exception: ' . $e->getMessage() );
		}
	}

	/**
	 * Run on plugin deactivation.
	 *
	 * @return void
	 */
	public static function deactivate(): void {
		try {
			// Remove all scheduled plugin events.
			wp_clear_scheduled_hook( 'sixrsh_send_order_notification' );
			wp_clear_scheduled_hook( 'sixrsh_send_customer_notification' );
			wp_clear_scheduled_hook( 'sixrsh_sync_cart' );
			wp_clear_scheduled_hook( 'sixrsh_cron_cleanup' );
		} catch ( \Throwable $e ) {
			error_log( '[6rsh WhatsApp] Activator::deactivate exception: ' . $e->getMessage() );
		}
	}

	/**
	 * Create (or upgrade) the custom database tables.
	 *
	 * @return void
	 */
	private static function create_tables(): void {
		global $wpdb;

		require_once ABSPATH . 'wp-admin/includes/upgrade.php';

		$charset_collate = $wpdb->get_charset_collate();
		$prefix          = $wpdb->prefix;

		$carts_table = "CREATE TABLE {$prefix}sixrsh_carts (
			cart_id         BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			cart_token      VARCHAR(64)     NOT NULL,
			user_phone      VARCHAR(30)     NOT NULL DEFAULT '',
			user_email      VARCHAR(191)    NOT NULL DEFAULT '',
			opt_in          TINYINT(1)      NOT NULL DEFAULT 1,
			items_json      TEXT            NOT NULL,
			cart_value      DECIMAL(12,2)   NOT NULL DEFAULT 0.00,
			currency        VARCHAR(10)     NOT NULL DEFAULT '',
			checkout_url    VARCHAR(2048)   NOT NULL DEFAULT '',
			captured_at     DATETIME        NOT NULL,
			last_activity_at DATETIME       NOT NULL,
			status          ENUM('open','closed','synced') NOT NULL DEFAULT 'open',
			synced_at       DATETIME        NULL,
			PRIMARY KEY     (cart_id),
			UNIQUE KEY      cart_token (cart_token)
		) {$charset_collate};";

		$logs_table = "CREATE TABLE {$prefix}sixrsh_logs (
			log_id          BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			event_type      VARCHAR(50)     NOT NULL DEFAULT '',
			customer_phone  VARCHAR(30)     NOT NULL DEFAULT '',
			template_name   VARCHAR(100)    NOT NULL DEFAULT '',
			status          ENUM('success','failed') NOT NULL DEFAULT 'failed',
			error_message   TEXT            NOT NULL,
			created_at      DATETIME        NOT NULL,
			PRIMARY KEY     (log_id),
			KEY             idx_event_status (event_type, status),
			KEY             idx_created_at   (created_at)
		) {$charset_collate};";

		dbDelta( $carts_table );
		dbDelta( $logs_table );
	}
}