<?php

function quiztech_theme_enqueue_scripts() {
    // List of Quiztech custom page templates
    $quiztech_templates = [
        'template-quiztech-dashboard.php',
        'template-manage-jobs.php',
        'template-manage-assessments.php',
        'template-manage-questions.php',
        'template-manage-credits.php',
        'template-view-results.php',
        'template-assessment-builder.php', // Add Assessment Builder template
    ];

    // Check if the current page is using one of our general Quiztech templates
    $is_quiztech_template = false;
    foreach ( $quiztech_templates as $template ) {
        if ( is_page_template( $template ) ) {
            $is_quiztech_template = true;
            break;
        }
    }

    // Only enqueue the script on our specific template pages
    if ( $is_quiztech_template ) {
        $script_path = get_stylesheet_directory() . '/js/quiztech-theme.js';
        $script_url = get_stylesheet_directory_uri() . '/js/quiztech-theme.js';
        $version = file_exists( $script_path ) ? filemtime( $script_path ) : '1.0';

        wp_enqueue_script( 
            'quiztech-theme-script', 
            $script_url, 
            array( 'jquery' ), // Depends on jQuery
            $version, 
            true // Load in footer
        );

        // Localize script with necessary data for AJAX calls
        wp_localize_script( 'quiztech-theme-script', 'quiztechThemeData', [
            'ajax_url' => admin_url( 'admin-ajax.php' ),
            'add_job_nonce' => wp_create_nonce( 'quiztech_add_new_job_action' ),
            'send_invite_nonce' => wp_create_nonce( 'quiztech_send_job_invite_action' ),
            'error_generic' => esc_html__( 'An error occurred. Please try again.', 'quiztech' ),
            'error_permissions' => esc_html__( 'You do not have permission to perform this action.', 'quiztech' ),
            'error_missing_assessment' => esc_html__( 'Error: No assessment is linked to this job.', 'quiztech' ),
            'invite_sent_success' => esc_html__( 'Invite sent successfully!', 'quiztech' ),
            'job_added_success' => esc_html__( 'Job added successfully!', 'quiztech' ),
        ]);
    }

    // --- Enqueue script specifically for Assessment Builder ---
    if ( is_page_template( 'template-assessment-builder.php' ) ) {
        $builder_script_path = get_stylesheet_directory() . '/js/quiztech-assessment-builder.js';
        $builder_script_url = get_stylesheet_directory_uri() . '/js/quiztech-assessment-builder.js';
        $builder_version = file_exists( $builder_script_path ) ? filemtime( $builder_script_path ) : '1.0';

        wp_enqueue_script(
            'quiztech-builder-script', // Unique handle
            $builder_script_url,
            array( 'jquery', 'jquery-ui-sortable' ), // Depends on jQuery and Sortable for drag/drop later
            $builder_version,
            true // Load in footer
        );

        // Localize data specifically for the builder script
        wp_localize_script( 'quiztech-builder-script', 'quiztechBuilderData', [
            'ajax_url' => admin_url( 'admin-ajax.php' ),
            'fetch_nonce' => wp_create_nonce( 'quiztech_fetch_library_questions_action' ), // TODO: Verify action name in AJAX handler
            'save_nonce' => wp_create_nonce( 'quiztech_save_assessment_action' ),       // TODO: Verify action name in AJAX handler
            'error_generic' => esc_html__( 'An error occurred. Please try again.', 'quiztech' ),
            'loading_questions' => esc_html__( 'Loading questions...', 'quiztech' ),
            'saving_assessment' => esc_html__( 'Saving assessment...', 'quiztech' ),
            'assessment_saved' => esc_html__( 'Assessment saved successfully!', 'quiztech' ),
            // Add more localized strings as needed
        ]);
    }
}
add_action( 'wp_enqueue_scripts', 'quiztech_theme_enqueue_scripts' );


/**
 * AJAX handler for adding a new job post from the frontend.
 */
function quiztech_ajax_add_new_job() {
    // 1. Verify Nonce
    check_ajax_referer( 'quiztech_add_new_job_action', 'nonce' );

    // 2. Check Capabilities (adjust capability if needed)
    if ( ! current_user_can( 'manage_options' ) ) {
        wp_send_json_error( [ 'message' => esc_html__( 'Insufficient permissions.', 'quiztech' ) ], 403 );
    }

    // 3. Sanitize Input
    $job_title = isset( $_POST['job_title'] ) ? sanitize_text_field( wp_unslash( $_POST['job_title'] ) ) : '';
    $job_description = isset( $_POST['job_description'] ) ? sanitize_textarea_field( wp_unslash( $_POST['job_description'] ) ) : '';

    if ( empty( $job_title ) ) {
         wp_send_json_error( [ 'message' => esc_html__( 'Job title cannot be empty.', 'quiztech' ) ], 400 );
    }

    // 4. Create Post
    $post_data = [
        'post_title'   => $job_title,
        'post_content' => $job_description,
        'post_status'  => 'publish', // Or 'draft' if preferred
        'post_author'  => get_current_user_id(),
        'post_type'    => 'job',
    ];

    $post_id = wp_insert_post( $post_data, true ); // Pass true to return WP_Error on failure

    // 5. Send Response
    if ( is_wp_error( $post_id ) ) {
        wp_send_json_error( [ 'message' => $post_id->get_error_message() ], 500 );
    } else {
        // Optionally return HTML for the new row, or just success and let JS handle refresh/update
        wp_send_json_success( [
            'message' => esc_html__( 'Job created successfully.', 'quiztech' ),
            'post_id' => $post_id
        ] );
    }
}
add_action( 'wp_ajax_add_new_job', 'quiztech_ajax_add_new_job' );


/**
 * AJAX handler for sending a job invite from the frontend.
 */
function quiztech_ajax_send_job_invite() {
    // 1. Verify Nonce
    check_ajax_referer( 'quiztech_send_job_invite_action', 'nonce' );

    // 2. Check Capabilities (adjust capability if needed)
    if ( ! current_user_can( 'manage_options' ) ) {
        wp_send_json_error( [ 'message' => esc_html__( 'Insufficient permissions.', 'quiztech' ) ], 403 );
    }

    // 3. Sanitize Input
    $job_id = isset( $_POST['job_id'] ) ? absint( $_POST['job_id'] ) : 0;
    $applicant_email = isset( $_POST['applicant_email'] ) ? sanitize_email( wp_unslash( $_POST['applicant_email'] ) ) : '';

    if ( ! $job_id || ! is_email( $applicant_email ) ) {
        wp_send_json_error( [ 'message' => esc_html__( 'Invalid job ID or email address.', 'quiztech' ) ], 400 );
    }

    // 4. Check if Job exists and belongs to user (optional extra check)
    $job_post = get_post( $job_id );
    if ( ! $job_post || $job_post->post_type !== 'job' || $job_post->post_author != get_current_user_id() ) {
         wp_send_json_error( [ 'message' => esc_html__( 'Invalid job specified.', 'quiztech' ) ], 404 );
    }

    // 5. Get Linked Assessment ID
    $assessment_id = get_post_meta( $job_id, '_quiztech_linked_assessment_id', true );
    if ( empty( $assessment_id ) ) {
        wp_send_json_error( [ 'message' => esc_html__( 'No assessment is linked to this job. Please edit the job and link an assessment.', 'quiztech' ) ], 400 );
    }
    $assessment_id = absint( $assessment_id );

    // 6. Use the Invitation Class (ensure plugin is active and class exists)
    if ( ! class_exists( 'Quiztech\\AssessmentPlatform\\Includes\\Invitations' ) ) {
         wp_send_json_error( [ 'message' => esc_html__( 'Invitation system is unavailable.', 'quiztech' ) ], 500 );
    }

    try {
        $invitations = new \Quiztech\AssessmentPlatform\Includes\Invitations();
        $result = $invitations->create_invitation( $job_id, $assessment_id, $applicant_email );

        if ( is_wp_error( $result ) ) {
            wp_send_json_error( [ 'message' => $result->get_error_message() ], 500 );
        } elseif ( $result === false ) {
            // Generic failure from create_invitation if no WP_Error
             wp_send_json_error( [ 'message' => esc_html__( 'Failed to create invitation.', 'quiztech' ) ], 500 );
        } else {
            // Success! $result contains the token. Now send the email.
            $token = $result;
            $email_sent = $invitations->send_invitation_email( $applicant_email, $token, [ 'job_title' => get_the_title( $job_id ) ] );

            if ( $email_sent ) {
                wp_send_json_success( [ 'message' => esc_html__( 'Invitation sent successfully.', 'quiztech' ) ] );
            } else {
                // Invitation created, but email failed.
                 wp_send_json_error( [ 'message' => esc_html__( 'Invitation created, but the email could not be sent. Please check email settings.', 'quiztech' ) ], 500 );
            }
        }
    } catch ( \Exception $e ) {
        // Catch any unexpected exceptions
        error_log( 'Quiztech Send Invite Error: ' . $e->getMessage() );
        wp_send_json_error( [ 'message' => esc_html__( 'An unexpected error occurred while sending the invitation.', 'quiztech' ) ], 500 );
    }
}
add_action( 'wp_ajax_send_job_invite', 'quiztech_ajax_send_job_invite' );