<?php
/**
 * Theme management admin page.
 *
 * @package BreznFlow
 * @since   1.0.0
 */

namespace BreznFlow\Admin;

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

use BreznFlow\Features\ThemeImporter;
use BreznFlow\Features\ThemeRegistry;

/**
 * Handles theme import, deletion, and the themes admin page rendering.
 *
 * @since 1.0.0
 */
class ThemesPage {

	/**
	 * Registers admin_init hooks for import and delete handling.
	 *
	 * @since  1.0.0
	 * @return void
	 */
	public function register(): void {
		add_action( 'admin_init', array( $this, 'handle_import' ) );
		add_action( 'admin_init', array( $this, 'handle_delete' ) );
	}

	/**
	 * Processes the theme import form submission.
	 * Runs early in admin_init so wp_safe_redirect() works before any output.
	 */
	public function handle_import(): void {
		if ( ! isset( $_GET['page'] ) || 'breznflow-themes' !== $_GET['page'] ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			return;
		}

		if ( empty( $_POST['_wpnonce'] ) || empty( $_FILES['breznflow_theme_file'] ) ) {
			return;
		}

		check_admin_referer( 'breznflow_theme_import' );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'Insufficient permissions.', 'breznflow' ) );
		}

		$file = $_FILES['breznflow_theme_file']; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput

		// Verify file extension.
		$filename = isset( $file['name'] ) ? sanitize_file_name( $file['name'] ) : '';
		if ( ! str_ends_with( $filename, '.breznflow.json' ) && ! str_ends_with( $filename, '.json' ) ) {
			wp_safe_redirect(
				add_query_arg(
					array(
						'page'  => 'breznflow-themes',
						'error' => 'invalid_file',
					),
					admin_url( 'admin.php' )
				)
			);
			exit;
		}

		if ( ! isset( $file['tmp_name'] ) || ! is_uploaded_file( $file['tmp_name'] ) ) {
			wp_safe_redirect(
				add_query_arg(
					array(
						'page'  => 'breznflow-themes',
						'error' => 'upload_failed',
					),
					admin_url( 'admin.php' )
				)
			);
			exit;
		}

		// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
		$raw = file_get_contents( $file['tmp_name'] );
		if ( false === $raw ) {
			wp_safe_redirect(
				add_query_arg(
					array(
						'page'  => 'breznflow-themes',
						'error' => 'read_failed',
					),
					admin_url( 'admin.php' )
				)
			);
			exit;
		}

		$data = json_decode( $raw, true );
		if ( ! is_array( $data ) ) {
			wp_safe_redirect(
				add_query_arg(
					array(
						'page'  => 'breznflow-themes',
						'error' => 'invalid_json',
					),
					admin_url( 'admin.php' )
				)
			);
			exit;
		}

		$result = ThemeImporter::import( $data );

		if ( is_wp_error( $result ) ) {
			wp_safe_redirect(
				add_query_arg(
					array(
						'page'    => 'breznflow-themes',
						'error'   => 'validation',
						'message' => rawurlencode( $result->get_error_message() ),
					),
					admin_url( 'admin.php' )
				)
			);
			exit;
		}

		wp_safe_redirect(
			add_query_arg(
				array(
					'page'     => 'breznflow-themes',
					'imported' => '1',
				),
				admin_url( 'admin.php' )
			)
		);
		exit;
	}

	/**
	 * Processes a theme delete action.
	 */
	public function handle_delete(): void {
		if ( ! isset( $_GET['page'] ) || 'breznflow-themes' !== $_GET['page'] ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			return;
		}

		if ( empty( $_GET['action'] ) || 'delete_theme' !== $_GET['action'] ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			return;
		}

		$id = isset( $_GET['theme_id'] ) ? sanitize_key( $_GET['theme_id'] ) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Recommended
		if ( '' === $id ) {
			return;
		}

		check_admin_referer( 'breznflow_theme_delete_' . $id );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'Insufficient permissions.', 'breznflow' ) );
		}

		ThemeImporter::delete( $id );

		wp_safe_redirect(
			add_query_arg(
				array(
					'page'    => 'breznflow-themes',
					'deleted' => '1',
				),
				admin_url( 'admin.php' )
			)
		);
		exit;
	}

	/**
	 * Renders the themes management page.
	 *
	 * @since  1.0.0
	 * @return void
	 */
	public function render(): void {
		require BREZNFLOW_DIR . 'includes/Admin/views/themes.php';
	}
}