<?php
/**
 * Admin interface for plugin settings and manual sync.
 *
 * @package InformatiqSmartPricing
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Admin class.
 */
class Informatiq_SP_Admin {
	/**
	 * Logger instance.
	 *
	 * @var Informatiq_SP_Logger
	 */
	private $logger;

	/**
	 * Price updater instance.
	 *
	 * @var Informatiq_SP_Price_Updater
	 */
	private $price_updater;

	/**
	 * Constructor.
	 *
	 * @param Informatiq_SP_Logger        $logger        Logger instance.
	 * @param Informatiq_SP_Price_Updater $price_updater Price updater instance.
	 */
	public function __construct( $logger, $price_updater ) {
		$this->logger        = $logger;
		$this->price_updater = $price_updater;

		// Add admin menu.
		add_action( 'admin_menu', array( $this, 'add_admin_menu' ) );

		// Register settings.
		add_action( 'admin_init', array( $this, 'register_settings' ) );

		// Handle OAuth callback.
		add_action( 'admin_init', array( $this, 'handle_oauth_callback' ) );

		// Handle AJAX requests.
		add_action( 'wp_ajax_informatiq_sp_manual_sync', array( $this, 'handle_manual_sync' ) );
		add_action( 'wp_ajax_informatiq_sp_test_connection', array( $this, 'handle_test_connection' ) );
		add_action( 'wp_ajax_informatiq_sp_revoke_auth', array( $this, 'handle_revoke_auth' ) );
		add_action( 'wp_ajax_informatiq_sp_compare_products', array( $this, 'handle_compare_products' ) );

		// Enqueue admin assets.
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin_assets' ) );
	}

	/**
	 * Add admin menu under WooCommerce.
	 */
	public function add_admin_menu() {
		add_submenu_page(
			'woocommerce',
			__( 'Smart Pricing', 'informatiq-smart-pricing' ),
			__( 'Smart Pricing', 'informatiq-smart-pricing' ),
			'manage_woocommerce',
			'informatiq-smart-pricing',
			array( $this, 'render_admin_page' )
		);
	}

	/**
	 * Register plugin settings.
	 */
	public function register_settings() {
		// Register settings.
		register_setting( 'informatiq_sp_settings', 'informatiq_sp_merchant_id' );
		register_setting( 'informatiq_sp_settings', 'informatiq_sp_client_id' );
		register_setting( 'informatiq_sp_settings', 'informatiq_sp_client_secret' );
		register_setting( 'informatiq_sp_settings', 'informatiq_sp_minimum_margin' );
		register_setting( 'informatiq_sp_settings', 'informatiq_sp_auto_update_enabled' );
		register_setting( 'informatiq_sp_settings', 'informatiq_sp_update_frequency' );

		// Add settings sections.
		add_settings_section(
			'informatiq_sp_google_settings',
			__( 'Google Merchant Center Settings', 'informatiq-smart-pricing' ),
			array( $this, 'render_google_settings_section' ),
			'informatiq_sp_settings'
		);

		add_settings_section(
			'informatiq_sp_pricing_settings',
			__( 'Pricing Settings', 'informatiq-smart-pricing' ),
			array( $this, 'render_pricing_settings_section' ),
			'informatiq_sp_settings'
		);

		add_settings_section(
			'informatiq_sp_automation_settings',
			__( 'Automation Settings', 'informatiq-smart-pricing' ),
			array( $this, 'render_automation_settings_section' ),
			'informatiq_sp_settings'
		);

		// Add settings fields.
		add_settings_field(
			'informatiq_sp_merchant_id',
			__( 'Google Merchant ID', 'informatiq-smart-pricing' ),
			array( $this, 'render_merchant_id_field' ),
			'informatiq_sp_settings',
			'informatiq_sp_google_settings'
		);

		add_settings_field(
			'informatiq_sp_oauth_credentials',
			__( 'OAuth 2.0 Credentials', 'informatiq-smart-pricing' ),
			array( $this, 'render_oauth_credentials_field' ),
			'informatiq_sp_settings',
			'informatiq_sp_google_settings'
		);

		add_settings_field(
			'informatiq_sp_authorization',
			__( 'Google Authorization', 'informatiq-smart-pricing' ),
			array( $this, 'render_authorization_field' ),
			'informatiq_sp_settings',
			'informatiq_sp_google_settings'
		);

		add_settings_field(
			'informatiq_sp_minimum_margin',
			__( 'Minimum Margin (%)', 'informatiq-smart-pricing' ),
			array( $this, 'render_minimum_margin_field' ),
			'informatiq_sp_settings',
			'informatiq_sp_pricing_settings'
		);

		add_settings_field(
			'informatiq_sp_auto_update_enabled',
			__( 'Enable Automatic Updates', 'informatiq-smart-pricing' ),
			array( $this, 'render_auto_update_field' ),
			'informatiq_sp_settings',
			'informatiq_sp_automation_settings'
		);

		add_settings_field(
			'informatiq_sp_update_frequency',
			__( 'Update Frequency', 'informatiq-smart-pricing' ),
			array( $this, 'render_update_frequency_field' ),
			'informatiq_sp_settings',
			'informatiq_sp_automation_settings'
		);
	}

	/**
	 * Handle OAuth callback from Google.
	 */
	public function handle_oauth_callback() {
		// Check if this is an OAuth callback.
		if ( ! isset( $_GET['informatiq_sp_oauth'] ) || $_GET['informatiq_sp_oauth'] !== 'callback' ) {
			return;
		}

		// Verify state parameter.
		$state = isset( $_GET['state'] ) ? sanitize_text_field( $_GET['state'] ) : '';
		$saved_state = get_transient( 'informatiq_sp_oauth_state' );

		if ( empty( $state ) || $state !== $saved_state ) {
			add_settings_error(
				'informatiq_sp_messages',
				'informatiq_sp_oauth_error',
				__( 'OAuth state mismatch. Please try again.', 'informatiq-smart-pricing' ),
				'error'
			);
			return;
		}

		delete_transient( 'informatiq_sp_oauth_state' );

		// Check for errors.
		if ( isset( $_GET['error'] ) ) {
			$error = sanitize_text_field( $_GET['error'] );
			$error_desc = isset( $_GET['error_description'] ) ? sanitize_text_field( $_GET['error_description'] ) : $error;
			add_settings_error(
				'informatiq_sp_messages',
				'informatiq_sp_oauth_error',
				sprintf( __( 'Authorization failed: %s', 'informatiq-smart-pricing' ), $error_desc ),
				'error'
			);
			return;
		}

		// Get authorization code.
		$code = isset( $_GET['code'] ) ? sanitize_text_field( $_GET['code'] ) : '';

		if ( empty( $code ) ) {
			add_settings_error(
				'informatiq_sp_messages',
				'informatiq_sp_oauth_error',
				__( 'No authorization code received.', 'informatiq-smart-pricing' ),
				'error'
			);
			return;
		}

		// Exchange code for tokens.
		$client_id     = get_option( 'informatiq_sp_client_id' );
		$client_secret = get_option( 'informatiq_sp_client_secret' );
		$redirect_uri  = $this->get_oauth_redirect_uri();

		try {
			$tokens = Informatiq_SP_Google_API::exchange_code_for_tokens(
				$code,
				$client_id,
				$client_secret,
				$redirect_uri
			);

			// Save refresh token.
			update_option( 'informatiq_sp_refresh_token', $tokens['refresh_token'] );

			$this->logger->info( 'Google OAuth authorization successful' );

			// Redirect to settings page with success message.
			wp_redirect( admin_url( 'admin.php?page=informatiq-smart-pricing&oauth=success' ) );
			exit;

		} catch ( Exception $e ) {
			$this->logger->error( 'OAuth token exchange failed: ' . $e->getMessage() );
			add_settings_error(
				'informatiq_sp_messages',
				'informatiq_sp_oauth_error',
				sprintf( __( 'Token exchange failed: %s', 'informatiq-smart-pricing' ), $e->getMessage() ),
				'error'
			);
		}
	}

	/**
	 * Get OAuth redirect URI.
	 *
	 * @return string Redirect URI.
	 */
	private function get_oauth_redirect_uri() {
		return admin_url( 'admin.php?page=informatiq-smart-pricing&informatiq_sp_oauth=callback' );
	}

	/**
	 * Check if plugin is authorized.
	 *
	 * @return bool True if authorized.
	 */
	private function is_authorized() {
		return ! empty( get_option( 'informatiq_sp_refresh_token' ) );
	}

	/**
	 * Render admin page.
	 */
	public function render_admin_page() {
		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			return;
		}

		// Check for OAuth success message.
		if ( isset( $_GET['oauth'] ) && $_GET['oauth'] === 'success' ) {
			add_settings_error(
				'informatiq_sp_messages',
				'informatiq_sp_message',
				__( 'Google authorization successful!', 'informatiq-smart-pricing' ),
				'success'
			);
		}

		// Check if form was submitted.
		if ( isset( $_GET['settings-updated'] ) ) {
			// Update cron schedule if frequency changed.
			$frequency = get_option( 'informatiq_sp_update_frequency', 'daily' );
			Informatiq_SP_Scheduler::reschedule( $frequency );

			add_settings_error(
				'informatiq_sp_messages',
				'informatiq_sp_message',
				__( 'Settings saved successfully.', 'informatiq-smart-pricing' ),
				'success'
			);
		}

		?>
		<div class="wrap informatiq-sp-admin">
			<h1><?php echo esc_html( get_admin_page_title() ); ?></h1>

			<?php settings_errors( 'informatiq_sp_messages' ); ?>

			<div class="informatiq-sp-content">
				<div class="informatiq-sp-main">
					<form action="options.php" method="post">
						<?php
						settings_fields( 'informatiq_sp_settings' );
						do_settings_sections( 'informatiq_sp_settings' );
						submit_button( __( 'Save Settings', 'informatiq-smart-pricing' ) );
						?>
					</form>

					<hr>

					<div class="informatiq-sp-actions">
						<h2><?php esc_html_e( 'Manual Actions', 'informatiq-smart-pricing' ); ?></h2>

						<p>
							<button type="button" class="button button-secondary" id="informatiq-sp-test-connection" <?php disabled( ! $this->is_authorized() ); ?>>
								<?php esc_html_e( 'Test Google API Connection', 'informatiq-smart-pricing' ); ?>
							</button>
							<button type="button" class="button button-primary" id="informatiq-sp-manual-sync" <?php disabled( ! $this->is_authorized() ); ?>>
								<?php esc_html_e( 'Run Manual Sync Now', 'informatiq-smart-pricing' ); ?>
							</button>
						</p>

						<?php if ( ! $this->is_authorized() ) : ?>
							<p class="description" style="color: #d63638;">
								<?php esc_html_e( 'Please authorize with Google first to use these features.', 'informatiq-smart-pricing' ); ?>
							</p>
						<?php endif; ?>

						<div id="informatiq-sp-sync-status" class="notice" style="display: none;"></div>
					</div>

					<hr>

					<?php $this->render_schedule_info(); ?>

					<hr>

					<?php $this->render_product_comparison(); ?>

					<hr>

					<?php $this->render_logs_section(); ?>
				</div>

				<div class="informatiq-sp-sidebar">
					<?php $this->render_sidebar(); ?>
				</div>
			</div>
		</div>
		<?php
	}

	/**
	 * Render Google settings section description.
	 */
	public function render_google_settings_section() {
		echo '<p>' . esc_html__( 'Configure your Google Merchant Center API credentials using OAuth 2.0.', 'informatiq-smart-pricing' ) . '</p>';
	}

	/**
	 * Render pricing settings section description.
	 */
	public function render_pricing_settings_section() {
		echo '<p>' . esc_html__( 'Configure pricing rules and safeguards.', 'informatiq-smart-pricing' ) . '</p>';
	}

	/**
	 * Render automation settings section description.
	 */
	public function render_automation_settings_section() {
		echo '<p>' . esc_html__( 'Configure automated price updates.', 'informatiq-smart-pricing' ) . '</p>';
	}

	/**
	 * Render merchant ID field.
	 */
	public function render_merchant_id_field() {
		$value = get_option( 'informatiq_sp_merchant_id' );
		?>
		<input type="text" name="informatiq_sp_merchant_id" id="informatiq_sp_merchant_id"
		       value="<?php echo esc_attr( $value ); ?>" class="regular-text">
		<p class="description">
			<?php esc_html_e( 'Your Google Merchant Center ID (found in Merchant Center settings).', 'informatiq-smart-pricing' ); ?>
		</p>
		<?php
	}

	/**
	 * Render OAuth credentials field.
	 */
	public function render_oauth_credentials_field() {
		$client_id     = get_option( 'informatiq_sp_client_id' );
		$client_secret = get_option( 'informatiq_sp_client_secret' );
		?>
		<div class="informatiq-sp-oauth-credentials">
			<p>
				<label for="informatiq_sp_client_id"><strong><?php esc_html_e( 'Client ID:', 'informatiq-smart-pricing' ); ?></strong></label><br>
				<input type="text" name="informatiq_sp_client_id" id="informatiq_sp_client_id"
				       value="<?php echo esc_attr( $client_id ); ?>" class="large-text">
			</p>
			<p>
				<label for="informatiq_sp_client_secret"><strong><?php esc_html_e( 'Client Secret:', 'informatiq-smart-pricing' ); ?></strong></label><br>
				<input type="password" name="informatiq_sp_client_secret" id="informatiq_sp_client_secret"
				       value="<?php echo esc_attr( $client_secret ); ?>" class="regular-text">
			</p>
			<p class="description">
				<?php
				printf(
					/* translators: %s: redirect URI */
					esc_html__( 'Create OAuth 2.0 credentials in Google Cloud Console. Use this as your Authorized redirect URI: %s', 'informatiq-smart-pricing' ),
					'<code>' . esc_html( $this->get_oauth_redirect_uri() ) . '</code>'
				);
				?>
			</p>
		</div>
		<?php
	}

	/**
	 * Render authorization field.
	 */
	public function render_authorization_field() {
		$client_id     = get_option( 'informatiq_sp_client_id' );
		$client_secret = get_option( 'informatiq_sp_client_secret' );
		$is_authorized = $this->is_authorized();
		$has_credentials = ! empty( $client_id ) && ! empty( $client_secret );

		if ( $is_authorized ) {
			?>
			<div class="informatiq-sp-auth-status authorized">
				<span class="dashicons dashicons-yes-alt" style="color: #00a32a;"></span>
				<strong style="color: #00a32a;"><?php esc_html_e( 'Authorized', 'informatiq-smart-pricing' ); ?></strong>
				<p class="description">
					<?php esc_html_e( 'Plugin is authorized to access your Google Merchant Center.', 'informatiq-smart-pricing' ); ?>
				</p>
				<p>
					<button type="button" class="button button-secondary" id="informatiq-sp-revoke-auth">
						<?php esc_html_e( 'Revoke Authorization', 'informatiq-smart-pricing' ); ?>
					</button>
				</p>
			</div>
			<?php
		} elseif ( $has_credentials ) {
			// Generate authorization URL.
			$state = wp_generate_password( 32, false );
			set_transient( 'informatiq_sp_oauth_state', $state, 600 ); // 10 minutes.

			$auth_url = Informatiq_SP_Google_API::get_authorization_url(
				$client_id,
				$this->get_oauth_redirect_uri(),
				$state
			);
			?>
			<div class="informatiq-sp-auth-status not-authorized">
				<span class="dashicons dashicons-warning" style="color: #dba617;"></span>
				<strong style="color: #dba617;"><?php esc_html_e( 'Not Authorized', 'informatiq-smart-pricing' ); ?></strong>
				<p class="description">
					<?php esc_html_e( 'Click the button below to authorize this plugin with your Google account.', 'informatiq-smart-pricing' ); ?>
				</p>
				<p>
					<a href="<?php echo esc_url( $auth_url ); ?>" class="button button-primary">
						<?php esc_html_e( 'Authorize with Google', 'informatiq-smart-pricing' ); ?>
					</a>
				</p>
			</div>
			<?php
		} else {
			?>
			<div class="informatiq-sp-auth-status no-credentials">
				<span class="dashicons dashicons-info" style="color: #72aee6;"></span>
				<em><?php esc_html_e( 'Enter your OAuth credentials above and save settings first.', 'informatiq-smart-pricing' ); ?></em>
			</div>
			<?php
		}
	}

	/**
	 * Render minimum margin field.
	 */
	public function render_minimum_margin_field() {
		$value = get_option( 'informatiq_sp_minimum_margin', '10' );
		?>
		<input type="number" name="informatiq_sp_minimum_margin" id="informatiq_sp_minimum_margin"
		       value="<?php echo esc_attr( $value ); ?>" min="0" max="100" step="0.01" class="small-text">
		<span>%</span>
		<p class="description">
			<?php esc_html_e( 'Minimum profit margin to maintain. Prices will never go below (Cost + Margin%).', 'informatiq-smart-pricing' ); ?>
		</p>
		<?php
	}

	/**
	 * Render auto update field.
	 */
	public function render_auto_update_field() {
		$value = get_option( 'informatiq_sp_auto_update_enabled', '1' );
		?>
		<label>
			<input type="checkbox" name="informatiq_sp_auto_update_enabled" value="1"
				<?php checked( $value, '1' ); ?>>
			<?php esc_html_e( 'Enable automatic daily price updates', 'informatiq-smart-pricing' ); ?>
		</label>
		<?php
	}

	/**
	 * Render update frequency field.
	 */
	public function render_update_frequency_field() {
		$value = get_option( 'informatiq_sp_update_frequency', 'daily' );
		?>
		<select name="informatiq_sp_update_frequency" id="informatiq_sp_update_frequency">
			<option value="every_6_hours" <?php selected( $value, 'every_6_hours' ); ?>>
				<?php esc_html_e( 'Every 6 Hours', 'informatiq-smart-pricing' ); ?>
			</option>
			<option value="twice_daily" <?php selected( $value, 'twice_daily' ); ?>>
				<?php esc_html_e( 'Twice Daily', 'informatiq-smart-pricing' ); ?>
			</option>
			<option value="daily" <?php selected( $value, 'daily' ); ?>>
				<?php esc_html_e( 'Once Daily', 'informatiq-smart-pricing' ); ?>
			</option>
		</select>
		<p class="description">
			<?php esc_html_e( 'How often should prices be automatically updated?', 'informatiq-smart-pricing' ); ?>
		</p>
		<?php
	}

	/**
	 * Render schedule information.
	 */
	private function render_schedule_info() {
		$next_run = Informatiq_SP_Scheduler::get_next_run_time();
		$last_run = Informatiq_SP_Scheduler::get_last_run_info();
		?>
		<div class="informatiq-sp-schedule-info">
			<h2><?php esc_html_e( 'Schedule Information', 'informatiq-smart-pricing' ); ?></h2>

			<table class="widefat">
				<tbody>
					<tr>
						<th><?php esc_html_e( 'Next Scheduled Run:', 'informatiq-smart-pricing' ); ?></th>
						<td>
							<?php
							if ( $next_run ) {
								echo esc_html( date_i18n( get_option( 'date_format' ) . ' ' . get_option( 'time_format' ), $next_run ) );
							} else {
								esc_html_e( 'Not scheduled', 'informatiq-smart-pricing' );
							}
							?>
						</td>
					</tr>
					<tr>
						<th><?php esc_html_e( 'Last Run:', 'informatiq-smart-pricing' ); ?></th>
						<td>
							<?php
							if ( ! empty( $last_run['end'] ) ) {
								echo esc_html( date_i18n( get_option( 'date_format' ) . ' ' . get_option( 'time_format' ), strtotime( $last_run['end'] ) ) );

								if ( ! empty( $last_run['results'] ) ) {
									$results = $last_run['results'];
									printf(
										' - %s',
										sprintf(
											/* translators: %1$d: updated count, %2$d: processed count */
											esc_html__( '%1$d of %2$d products updated', 'informatiq-smart-pricing' ),
											$results['updated'],
											$results['processed']
										)
									);
								}
							} else {
								esc_html_e( 'Never', 'informatiq-smart-pricing' );
							}
							?>
						</td>
					</tr>
				</tbody>
			</table>
		</div>
		<?php
	}

	/**
	 * Render product comparison section.
	 */
	private function render_product_comparison() {
		?>
		<div class="informatiq-sp-product-comparison">
			<h2><?php esc_html_e( 'Product Price Comparison', 'informatiq-smart-pricing' ); ?></h2>
			<p class="description">
				<?php esc_html_e( 'Compare WooCommerce product prices with Google Merchant Center prices.', 'informatiq-smart-pricing' ); ?>
			</p>

			<?php if ( $this->is_authorized() ) : ?>
				<p>
					<button type="button" class="button button-secondary" id="informatiq-sp-compare-products">
						<?php esc_html_e( 'Load Product Comparison', 'informatiq-smart-pricing' ); ?>
					</button>
					<span class="spinner" style="float: none; margin-top: 0;"></span>
				</p>

				<div id="informatiq-sp-comparison-results" style="display: none;">
					<table class="widefat striped">
						<thead>
							<tr>
								<th><?php esc_html_e( 'Product', 'informatiq-smart-pricing' ); ?></th>
								<th><?php esc_html_e( 'SKU', 'informatiq-smart-pricing' ); ?></th>
								<th><?php esc_html_e( 'Local Price', 'informatiq-smart-pricing' ); ?></th>
								<th><?php esc_html_e( 'Google Price', 'informatiq-smart-pricing' ); ?></th>
								<th><?php esc_html_e( 'Google Match', 'informatiq-smart-pricing' ); ?></th>
								<th><?php esc_html_e( 'Status', 'informatiq-smart-pricing' ); ?></th>
							</tr>
						</thead>
						<tbody id="informatiq-sp-comparison-tbody">
						</tbody>
					</table>
				</div>
			<?php else : ?>
				<p class="description" style="color: #d63638;">
					<?php esc_html_e( 'Please authorize with Google first to compare products.', 'informatiq-smart-pricing' ); ?>
				</p>
			<?php endif; ?>
		</div>
		<?php
	}

	/**
	 * Render logs section.
	 */
	private function render_logs_section() {
		$logs = $this->logger->get_todays_logs();
		?>
		<div class="informatiq-sp-logs">
			<h2><?php esc_html_e( 'Today\'s Price Updates', 'informatiq-smart-pricing' ); ?></h2>

			<?php if ( empty( $logs ) ) : ?>
				<p><?php esc_html_e( 'No price updates today.', 'informatiq-smart-pricing' ); ?></p>
			<?php else : ?>
				<table class="widefat striped">
					<thead>
						<tr>
							<th><?php esc_html_e( 'Time', 'informatiq-smart-pricing' ); ?></th>
							<th><?php esc_html_e( 'Product', 'informatiq-smart-pricing' ); ?></th>
							<th><?php esc_html_e( 'Old Price', 'informatiq-smart-pricing' ); ?></th>
							<th><?php esc_html_e( 'New Price', 'informatiq-smart-pricing' ); ?></th>
							<th><?php esc_html_e( 'Competitor Price', 'informatiq-smart-pricing' ); ?></th>
						</tr>
					</thead>
					<tbody>
						<?php foreach ( $logs as $log ) : ?>
							<tr>
								<td><?php echo esc_html( date_i18n( get_option( 'time_format' ), strtotime( $log->created_at ) ) ); ?></td>
								<td>
									<a href="<?php echo esc_url( get_edit_post_link( $log->product_id ) ); ?>">
										<?php echo esc_html( $log->product_name ); ?>
									</a>
								</td>
								<td><?php echo wp_kses_post( wc_price( $log->old_price ) ); ?></td>
								<td><?php echo wp_kses_post( wc_price( $log->new_price ) ); ?></td>
								<td><?php echo wp_kses_post( wc_price( $log->competitor_price ) ); ?></td>
							</tr>
						<?php endforeach; ?>
					</tbody>
				</table>
			<?php endif; ?>
		</div>
		<?php
	}

	/**
	 * Render sidebar.
	 */
	private function render_sidebar() {
		?>
		<div class="informatiq-sp-sidebar-box">
			<h3><?php esc_html_e( 'Setup Steps', 'informatiq-smart-pricing' ); ?></h3>
			<ol>
				<li><?php esc_html_e( 'Create OAuth 2.0 credentials in Google Cloud Console', 'informatiq-smart-pricing' ); ?></li>
				<li><?php esc_html_e( 'Enter Client ID and Client Secret above', 'informatiq-smart-pricing' ); ?></li>
				<li><?php esc_html_e( 'Click "Authorize with Google"', 'informatiq-smart-pricing' ); ?></li>
				<li><?php esc_html_e( 'Enter your Merchant ID', 'informatiq-smart-pricing' ); ?></li>
				<li><?php esc_html_e( 'Set your minimum margin and enable automation', 'informatiq-smart-pricing' ); ?></li>
			</ol>
		</div>

		<div class="informatiq-sp-sidebar-box">
			<h3><?php esc_html_e( 'Requirements', 'informatiq-smart-pricing' ); ?></h3>
			<ul>
				<li><?php esc_html_e( 'Products must be in stock', 'informatiq-smart-pricing' ); ?></li>
				<li><?php esc_html_e( 'Products must have SKU set', 'informatiq-smart-pricing' ); ?></li>
				<li><?php esc_html_e( 'Products must exist in Google Merchant Center', 'informatiq-smart-pricing' ); ?></li>
			</ul>
		</div>

		<div class="informatiq-sp-sidebar-box">
			<h3><?php esc_html_e( 'Support', 'informatiq-smart-pricing' ); ?></h3>
			<p>
				<?php
				printf(
					/* translators: %s: support URL */
					wp_kses_post( __( 'Need help? Visit <a href="%s" target="_blank">informatiq.services</a>', 'informatiq-smart-pricing' ) ),
					'https://informatiq.services'
				);
				?>
			</p>
		</div>
		<?php
	}

	/**
	 * Handle manual sync AJAX request.
	 */
	public function handle_manual_sync() {
		check_ajax_referer( 'informatiq_sp_admin', 'nonce' );

		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			wp_send_json_error( array( 'message' => __( 'Insufficient permissions', 'informatiq-smart-pricing' ) ) );
		}

		if ( ! $this->is_authorized() ) {
			wp_send_json_error( array( 'message' => __( 'Please authorize with Google first.', 'informatiq-smart-pricing' ) ) );
		}

		try {
			$scheduler = new Informatiq_SP_Scheduler( $this->price_updater );
			$results   = $scheduler->trigger_manual_update();

			wp_send_json_success(
				array(
					'message' => sprintf(
						/* translators: %1$d: updated count, %2$d: processed count */
						__( 'Sync completed! Updated %1$d of %2$d products.', 'informatiq-smart-pricing' ),
						$results['updated'],
						$results['processed']
					),
					'results' => $results,
				)
			);
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'message' => $e->getMessage() ) );
		}
	}

	/**
	 * Handle test connection AJAX request.
	 */
	public function handle_test_connection() {
		check_ajax_referer( 'informatiq_sp_admin', 'nonce' );

		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			wp_send_json_error( array( 'message' => __( 'Insufficient permissions', 'informatiq-smart-pricing' ) ) );
		}

		$merchant_id   = get_option( 'informatiq_sp_merchant_id' );
		$client_id     = get_option( 'informatiq_sp_client_id' );
		$client_secret = get_option( 'informatiq_sp_client_secret' );
		$refresh_token = get_option( 'informatiq_sp_refresh_token' );

		if ( empty( $merchant_id ) ) {
			wp_send_json_error( array( 'message' => __( 'Please enter your Merchant ID.', 'informatiq-smart-pricing' ) ) );
		}

		if ( empty( $refresh_token ) ) {
			wp_send_json_error( array( 'message' => __( 'Please authorize with Google first.', 'informatiq-smart-pricing' ) ) );
		}

		try {
			$google_api = new Informatiq_SP_Google_API(
				$merchant_id,
				$client_id,
				$client_secret,
				$refresh_token,
				$this->logger
			);
			$success = $google_api->test_connection();

			if ( $success ) {
				wp_send_json_success( array( 'message' => __( 'Connection successful!', 'informatiq-smart-pricing' ) ) );
			} else {
				wp_send_json_error( array( 'message' => __( 'Connection failed. Check your credentials.', 'informatiq-smart-pricing' ) ) );
			}
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'message' => $e->getMessage() ) );
		}
	}

	/**
	 * Handle revoke authorization AJAX request.
	 */
	public function handle_revoke_auth() {
		check_ajax_referer( 'informatiq_sp_admin', 'nonce' );

		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			wp_send_json_error( array( 'message' => __( 'Insufficient permissions', 'informatiq-smart-pricing' ) ) );
		}

		delete_option( 'informatiq_sp_refresh_token' );

		$this->logger->info( 'Google OAuth authorization revoked' );

		wp_send_json_success( array( 'message' => __( 'Authorization revoked.', 'informatiq-smart-pricing' ) ) );
	}

	/**
	 * Handle product comparison AJAX request.
	 */
	public function handle_compare_products() {
		check_ajax_referer( 'informatiq_sp_admin', 'nonce' );

		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			wp_send_json_error( array( 'message' => __( 'Insufficient permissions', 'informatiq-smart-pricing' ) ) );
		}

		$merchant_id   = get_option( 'informatiq_sp_merchant_id' );
		$client_id     = get_option( 'informatiq_sp_client_id' );
		$client_secret = get_option( 'informatiq_sp_client_secret' );
		$refresh_token = get_option( 'informatiq_sp_refresh_token' );

		if ( empty( $merchant_id ) || empty( $refresh_token ) ) {
			wp_send_json_error( array( 'message' => __( 'Please configure settings and authorize first.', 'informatiq-smart-pricing' ) ) );
		}

		try {
			$google_api = new Informatiq_SP_Google_API(
				$merchant_id,
				$client_id,
				$client_secret,
				$refresh_token,
				$this->logger
			);

			// Get all Google products indexed by various identifiers.
			$google_products_raw = $google_api->get_all_products();
			$google_products = array();

			// Log first product structure for debugging.
			if ( ! empty( $google_products_raw[0] ) ) {
				$this->logger->info( 'Sample Google product structure: ' . wp_json_encode( array_keys( $google_products_raw[0] ) ) );
				$this->logger->info( 'Sample Google product data: ' . wp_json_encode( $google_products_raw[0] ) );
			}

			foreach ( $google_products_raw as $gp ) {
				// Index by offerId (direct field).
				if ( ! empty( $gp['offerId'] ) ) {
					$google_products['offer_' . $gp['offerId']] = $gp;
				}

				// Index by gtin (direct field).
				if ( ! empty( $gp['gtin'] ) ) {
					$google_products['gtin_' . $gp['gtin']] = $gp;
				}

				// Also check nested attributes structure (new Merchant API format).
				if ( ! empty( $gp['attributes']['offerId'] ) ) {
					$google_products['offer_' . $gp['attributes']['offerId']] = $gp;
				}
				if ( ! empty( $gp['attributes']['gtin'] ) ) {
					$google_products['gtin_' . $gp['attributes']['gtin']] = $gp;
				}

				// Check productId which might contain the identifier.
				if ( ! empty( $gp['productId'] ) ) {
					// productId format is usually: online:en:US:SKU or channel:language:country:offerId
					$parts = explode( ':', $gp['productId'] );
					if ( count( $parts ) >= 4 ) {
						$extracted_offer = $parts[ count( $parts ) - 1 ];
						$google_products['offer_' . $extracted_offer] = $gp;
					}
				}

				// Check name field which contains full resource path.
				if ( ! empty( $gp['name'] ) ) {
					// name format: accounts/{account}/products/{product_id}
					// product_id format: online~en~US~SKU
					if ( preg_match( '/products\/(.+)$/', $gp['name'], $matches ) ) {
						$product_id = $matches[1];
						$parts = explode( '~', $product_id );
						if ( count( $parts ) >= 4 ) {
							$extracted_offer = $parts[ count( $parts ) - 1 ];
							$google_products['offer_' . $extracted_offer] = $gp;
						}
					}
				}
			}

			// Get WooCommerce in-stock products (limit to 50 for performance).
			$wc_products = wc_get_products( array(
				'status'       => 'publish',
				'stock_status' => 'instock',
				'limit'        => 50,
				'return'       => 'objects',
				'type'         => array( 'simple', 'variable' ),
			) );

			$comparison = array();

			foreach ( $wc_products as $product ) {
				$sku = $product->get_sku();
				if ( empty( $sku ) ) {
					continue;
				}

				// Get local price (sale price priority, then regular).
				$sale_price    = $product->get_sale_price();
				$regular_price = $product->get_regular_price();
				$local_price   = ! empty( $sale_price ) ? $sale_price : $regular_price;
				$price_type    = ! empty( $sale_price ) ? 'sale' : 'regular';

				// Try to find matching Google product.
				$google_product = null;
				$match_type     = '';

				// Try offerId match.
				if ( isset( $google_products['offer_' . $sku] ) ) {
					$google_product = $google_products['offer_' . $sku];
					$match_type     = 'offerId';
				}
				// Try GTIN match (when SKU is a barcode).
				elseif ( isset( $google_products['gtin_' . $sku] ) ) {
					$google_product = $google_products['gtin_' . $sku];
					$match_type     = 'gtin';
				}

				// Get Google price.
				$google_price = null;
				if ( $google_product ) {
					if ( isset( $google_product['price']['amountMicros'] ) ) {
						$google_price = (float) $google_product['price']['amountMicros'] / 1000000;
					}
				}

				$comparison[] = array(
					'id'            => $product->get_id(),
					'name'          => $product->get_name(),
					'sku'           => $sku,
					'local_price'   => $local_price ? (float) $local_price : null,
					'price_type'    => $price_type,
					'google_price'  => $google_price,
					'match_type'    => $match_type,
					'found'         => ! empty( $google_product ),
					'google_offer'  => $google_product ? ( $google_product['offerId'] ?? '' ) : '',
				);
			}

			// Get sample of indexed keys for debugging.
			$sample_keys = array_slice( array_keys( $google_products ), 0, 10 );

			wp_send_json_success( array(
				'products'       => $comparison,
				'google_count'   => count( $google_products_raw ),
				'wc_count'       => count( $wc_products ),
				'currency'       => get_woocommerce_currency_symbol(),
				'debug'          => array(
					'sample_google_keys'    => $sample_keys,
					'sample_google_product' => ! empty( $google_products_raw[0] ) ? $google_products_raw[0] : null,
					'index_count'           => count( $google_products ),
				),
			) );

		} catch ( Exception $e ) {
			wp_send_json_error( array( 'message' => $e->getMessage() ) );
		}
	}

	/**
	 * Enqueue admin assets.
	 *
	 * @param string $hook Current admin page hook.
	 */
	public function enqueue_admin_assets( $hook ) {
		if ( 'woocommerce_page_informatiq-smart-pricing' !== $hook ) {
			return;
		}

		wp_enqueue_style(
			'informatiq-sp-admin',
			INFORMATIQ_SP_PLUGIN_URL . 'assets/css/admin.css',
			array(),
			INFORMATIQ_SP_VERSION
		);

		wp_enqueue_script(
			'informatiq-sp-admin',
			INFORMATIQ_SP_PLUGIN_URL . 'assets/js/admin.js',
			array( 'jquery' ),
			INFORMATIQ_SP_VERSION,
			true
		);

		wp_localize_script(
			'informatiq-sp-admin',
			'informatiqSP',
			array(
				'ajaxUrl' => admin_url( 'admin-ajax.php' ),
				'nonce'   => wp_create_nonce( 'informatiq_sp_admin' ),
				'strings' => array(
					'syncInProgress'   => __( 'Sync in progress...', 'informatiq-smart-pricing' ),
					'testInProgress'   => __( 'Testing connection...', 'informatiq-smart-pricing' ),
					'revokeConfirm'    => __( 'Are you sure you want to revoke Google authorization?', 'informatiq-smart-pricing' ),
					'revokeInProgress' => __( 'Revoking...', 'informatiq-smart-pricing' ),
				),
			)
		);
	}
}