<?php
/**
 * Custom scripts CRUD manager.
 *
 * @package ATT_Consent
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class ATT_Consent_Scripts_Manager {

	/**
	 * Get the table name.
	 *
	 * @return string
	 */
	private static function table_name() {
		global $wpdb;
		return $wpdb->prefix . 'att_cc_scripts';
	}

	/**
	 * Get all scripts, optionally filtered.
	 *
	 * @param string|null $category Filter by category.
	 * @param string|null $placement Filter by placement.
	 * @return array
	 */
	public static function get_scripts( $category = null, $placement = null ) {
		global $wpdb;
		$table = self::table_name();

		$where  = array( 'status = %s' );
		$params = array( 'active' );

		if ( null !== $category ) {
			$where[]  = 'category = %s';
			$params[] = $category;
		}

		if ( null !== $placement ) {
			$where[]  = 'placement = %s';
			$params[] = $placement;
		}

		$where_sql = implode( ' AND ', $where );

		return $wpdb->get_results(
			$wpdb->prepare(
				"SELECT * FROM {$table} WHERE {$where_sql} ORDER BY priority ASC, id ASC", // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
				...$params
			),
			ARRAY_A
		);
	}

	/**
	 * Get all scripts (including inactive) for the admin list.
	 *
	 * @return array
	 */
	public static function get_all_scripts() {
		global $wpdb;
		$table = self::table_name();

		return $wpdb->get_results(
			"SELECT * FROM {$table} ORDER BY priority ASC, id ASC", // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
			ARRAY_A
		);
	}

	/**
	 * Get a single script by ID.
	 *
	 * @param int $id Script ID.
	 * @return array|null
	 */
	public static function get_script( $id ) {
		global $wpdb;
		$table = self::table_name();

		return $wpdb->get_row(
			$wpdb->prepare( "SELECT * FROM {$table} WHERE id = %d", $id ), // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
			ARRAY_A
		);
	}

	/**
	 * Save (insert or update) a script.
	 *
	 * @param array $data Script data.
	 * @return int|false The script ID on success, false on failure.
	 */
	public static function save_script( $data ) {
		global $wpdb;
		$table = self::table_name();

		$allowed_categories = array( 'functional', 'analytics', 'marketing' );
		$allowed_placements = array( 'head', 'footer' );
		$allowed_statuses   = array( 'active', 'inactive' );

		$fields = array(
			'name'      => sanitize_text_field( $data['name'] ?? '' ),
			'snippet'   => wp_unslash( $data['snippet'] ?? '' ),
			'category'  => in_array( $data['category'] ?? '', $allowed_categories, true ) ? $data['category'] : 'analytics',
			'placement' => in_array( $data['placement'] ?? '', $allowed_placements, true ) ? $data['placement'] : 'head',
			'status'    => in_array( $data['status'] ?? '', $allowed_statuses, true ) ? $data['status'] : 'active',
			'priority'  => absint( $data['priority'] ?? 10 ),
		);

		if ( ! empty( $data['id'] ) ) {
			$fields['updated_at'] = current_time( 'mysql' );
			$result = $wpdb->update(
				$table,
				$fields,
				array( 'id' => absint( $data['id'] ) ),
				array( '%s', '%s', '%s', '%s', '%s', '%d', '%s' ),
				array( '%d' )
			);
			return false !== $result ? absint( $data['id'] ) : false;
		}

		$fields['created_at'] = current_time( 'mysql' );
		$fields['updated_at'] = current_time( 'mysql' );
		$result = $wpdb->insert( $table, $fields );

		return false !== $result ? $wpdb->insert_id : false;
	}

	/**
	 * Delete a script by ID.
	 *
	 * @param int $id Script ID.
	 * @return bool
	 */
	public static function delete_script( $id ) {
		global $wpdb;
		$table = self::table_name();

		return false !== $wpdb->delete( $table, array( 'id' => absint( $id ) ), array( '%d' ) );
	}

	/**
	 * Get scripts grouped by category and placement for frontend output.
	 *
	 * @return array
	 */
	public static function get_scripts_for_frontend() {
		$scripts = self::get_scripts();
		$grouped = array(
			'functional' => array( 'head' => array(), 'footer' => array() ),
			'analytics'  => array( 'head' => array(), 'footer' => array() ),
			'marketing'  => array( 'head' => array(), 'footer' => array() ),
		);

		foreach ( $scripts as $script ) {
			$cat       = $script['category'];
			$placement = $script['placement'];
			if ( isset( $grouped[ $cat ][ $placement ] ) ) {
				$grouped[ $cat ][ $placement ][] = $script['snippet'];
			}
		}

		return $grouped;
	}

	/**
	 * Render scripts as inert HTML for a given placement.
	 *
	 * Script tags are output with type="text/plain" so they don't execute
	 * until activated by consent-manager.js. Non-script HTML (pixels, etc.)
	 * is wrapped in <template> tags.
	 *
	 * @param string $placement 'head' or 'footer'.
	 * @return string Combined HTML string.
	 */
	public static function render_scripts_as_html( $placement ) {
		$scripts = self::get_scripts( null, $placement );

		if ( empty( $scripts ) ) {
			return '';
		}

		$output = '';

		foreach ( $scripts as $script ) {
			$snippet  = trim( $script['snippet'] );
			$category = esc_attr( $script['category'] );

			if ( '' === $snippet ) {
				continue;
			}

			// Check if snippet contains <script> tags.
			if ( preg_match( '/<script[\s>]/i', $snippet ) ) {
				// Rewrite each <script> tag to type="text/plain" with category attribute.
				$snippet = preg_replace_callback(
					'/<script(\s[^>]*)?>|<script>/i',
					function ( $matches ) use ( $category ) {
						$attrs = isset( $matches[1] ) ? $matches[1] : '';

						// Strip any existing type attribute.
						$attrs = preg_replace( '/\s*type\s*=\s*(["\'])[^"\']*\1/i', '', $attrs );

						return '<script type="text/plain" data-att-cc-category="' . $category . '"' . $attrs . '>';
					},
					$snippet
				);

				$output .= $snippet . "\n";
			} elseif ( preg_match( '/^\s*</', $snippet ) ) {
				// Non-script HTML (img pixels, noscript, iframes, etc.).
				$output .= '<template data-att-cc-category="' . $category . '" data-att-cc-type="html">' . $snippet . '</template>' . "\n";
			} else {
				// Raw JS code without <script> wrapper.
				$output .= '<script type="text/plain" data-att-cc-category="' . $category . '">' . $snippet . '</script>' . "\n";
			}
		}

		return $output;
	}
}