<?php

namespace AcademicCrew\Avada;

use AcademicCrew\Core\Loader;

/**
 * Integrates plugin templates with the Avada / WordPress template hierarchy.
 *
 *  - Adds "AcademicCrew: Member Profile" and "AcademicCrew: Course Page" to the
 *    page-template dropdown so editors can assign them manually.
 *  - Loads the correct plugin template file when those templates are selected.
 *  - Falls back to plugin templates for CPT single views when the active theme
 *    has no specific template for them.
 */
class TemplateHierarchy {

    public function register( Loader $loader ): void {
        $loader->add_filter( 'theme_page_templates', $this, 'add_page_templates'          );
        $loader->add_filter( 'page_template',        $this, 'load_page_template'          );
        $loader->add_filter( 'template_include',     $this, 'maybe_use_plugin_template', 99 );
    }

    /**
     * Expose AcademicCrew templates in the Page Attributes → Template dropdown.
     */
    public function add_page_templates( array $templates ): array {
        $templates['academiccrew-member-profile'] = __( 'AcademicCrew: Member Profile', 'academiccrew' );
        $templates['academiccrew-course-page']    = __( 'AcademicCrew: Course Page',    'academiccrew' );
        return $templates;
    }

    /**
     * Load the plugin template file when a AcademicCrew page template is selected.
     */
    public function load_page_template( string $template ): string {
        global $post;
        if ( ! $post ) {
            return $template;
        }

        $selected = get_post_meta( $post->ID, '_wp_page_template', true );

        $map = [
            'academiccrew-member-profile' => ACADEMICCREW_PATH . 'templates/member/page-member.php',
            'academiccrew-course-page'    => ACADEMICCREW_PATH . 'templates/course/page-course.php',
        ];

        if ( isset( $map[ $selected ] ) && file_exists( $map[ $selected ] ) ) {
            return $map[ $selected ];
        }

        return $template;
    }

    /**
     * Use plugin templates for CPT single views when the theme has no own template.
     * Runs at priority 99 so it fires after Avada's own template_include filters.
     */
    public function maybe_use_plugin_template( string $template ): string {
        $cpt_map = [
            'academiccrew_member'   => 'member/page-member.php',
            'academiccrew_course'   => 'course/page-course.php',
            'acc_collaboration'   => 'collaboration/page-collaboration.php',
        ];

        $post_type = get_post_type();
        if ( ! $post_type || ! isset( $cpt_map[ $post_type ] ) ) {
            return $template;
        }

        // Avada / child theme has its own — don't override.
        $theme_template = get_stylesheet_directory() . '/single-' . $post_type . '.php';
        if ( file_exists( $theme_template ) ) {
            return $template;
        }

        $plugin_template = ACADEMICCREW_PATH . 'templates/' . $cpt_map[ $post_type ];
        if ( file_exists( $plugin_template ) ) {
            return $plugin_template;
        }

        return $template;
    }
}