<?php
/**
 * Plugin Name: AI Explainer
 * Plugin URI: https://aiexplainerpro.noveralis.com
 * Description: Detect AI-generated content with a 5-method local analysis engine. Display transparency badges, publish a public /authenticity page, block 22 AI training crawlers, and review your content with an EU AI Act transparency dashboard.
 * Version: 2.3.0
 * Author: Nicolas Severino
 * Author URI: https://nicolasseverino.fr
 * Text Domain: ai-explainer-pro
 * Domain Path: /languages
 * Requires at least: 6.0
 * Requires PHP: 7.4
 * License: GPL v3 or later
 * License URI: https://www.gnu.org/licenses/gpl-3.0.html
 *
 * @package AIExplainerPro
 */

if ( ! defined( 'WPINC' ) ) {
    die;
}

require_once plugin_dir_path( __FILE__ ) . 'includes/constants.php';

define( 'AIEP_VERSION',         '2.3.0' );
define( 'AIEP_PLUGIN_FILE',     __FILE__ );
define( 'AIEP_PLUGIN_DIR',      plugin_dir_path( __FILE__ ) );
define( 'AIEP_PLUGIN_URL',      plugin_dir_url( __FILE__ ) );
define( 'AIEP_PLUGIN_BASENAME', plugin_basename( __FILE__ ) );

// Back-compat aliases for any user code that referenced the long names.
define( 'AI_EXPLAINER_PRO_VERSION',         AIEP_VERSION );
define( 'AI_EXPLAINER_PRO_PLUGIN_DIR',      AIEP_PLUGIN_DIR );
define( 'AI_EXPLAINER_PRO_PLUGIN_URL',      AIEP_PLUGIN_URL );
define( 'AI_EXPLAINER_PRO_PLUGIN_BASENAME', AIEP_PLUGIN_BASENAME );



/*──────────────────────────────────────────────
 * Core modules (always loaded — Lite + Pro)
 *────────────────────────────────────────────*/
require_once AIEP_PLUGIN_DIR . 'includes/core/class-ai-explainer-pro-detection-engine.php';
require_once AIEP_PLUGIN_DIR . 'includes/core/class-ai-explainer-pro-compliance.php';
require_once AIEP_PLUGIN_DIR . 'includes/core/class-ai-explainer-pro-rest-api.php';
require_once AIEP_PLUGIN_DIR . 'includes/core/class-scraper-defense.php';
require_once AIEP_PLUGIN_DIR . 'includes/core/class-authenticity.php';

add_action( 'plugins_loaded', [ 'AI_Explainer_Pro_Scraper_Defense', 'init' ] );
add_action( 'plugins_loaded', [ 'AIEP_Authenticity', 'init' ] );

require_once AIEP_PLUGIN_DIR . 'admin/pages/class-dashboard-page.php';
require_once AIEP_PLUGIN_DIR . 'admin/pages/class-getstarted-page.php';
require_once AIEP_PLUGIN_DIR . 'admin/pages/class-detector-page.php';
require_once AIEP_PLUGIN_DIR . 'admin/pages/class-settings-page.php';
require_once AIEP_PLUGIN_DIR . 'admin/pages/class-compliance-page.php';

// Admin-post download handler — must be registered at boot so it fires
// BEFORE WordPress emits the admin header (page-render-time `header()`
// calls would otherwise no-op and the HTML report would leak into the
// admin layout instead of triggering a download).
AI_Explainer_Pro_Compliance_Page::register_hooks();

// REST routes
add_action( 'rest_api_init', [ 'AI_Explainer_Pro_REST_API', 'register_routes' ] );



/*──────────────────────────────────────────────
 * Admin menu
 *────────────────────────────────────────────*/
add_action( 'admin_menu', function () {
    add_menu_page(
        'AI Explainer',
        'AI Explainer',
        'manage_options',
        'ai-explainer-pro',
        'aiep_render_dashboard',
        'dashicons-superhero-alt',
        30
    );

    add_submenu_page( 'ai-explainer-pro', __( 'Dashboard', 'ai-explainer-pro' ),    __( 'Dashboard', 'ai-explainer-pro' ),    'manage_options', 'ai-explainer-pro',                'aiep_render_dashboard' );
    add_submenu_page( 'ai-explainer-pro', __( 'Get Started', 'ai-explainer-pro' ),  __( 'Get Started', 'ai-explainer-pro' ),  'manage_options', 'ai-explainer-pro-getstarted',     'aiep_render_getstarted' );
    add_submenu_page( 'ai-explainer-pro', __( 'Detector', 'ai-explainer-pro' ),     __( 'Detector', 'ai-explainer-pro' ),     'manage_options', 'ai-explainer-pro-detector',       'aiep_render_detector' );
    add_submenu_page( 'ai-explainer-pro', __( 'Compliance', 'ai-explainer-pro' ),   __( 'Compliance', 'ai-explainer-pro' ),   'manage_options', 'ai-explainer-pro-compliance',     'aiep_render_compliance' );
    add_submenu_page( 'ai-explainer-pro', __( 'Settings', 'ai-explainer-pro' ),     __( 'Settings', 'ai-explainer-pro' ),     'manage_options', 'ai-explainer-pro-settings',       'aiep_render_settings' );

    do_action( 'aiep_register_admin_submenus' );
} );

function aiep_render_dashboard()  { ( new AI_Explainer_Pro_Dashboard_Page() )->render(); }
function aiep_render_getstarted() { AI_Explainer_Pro_Getstarted_Page::handle_actions(); ( new AI_Explainer_Pro_Getstarted_Page() )->render(); }
function aiep_render_detector()   { ( new AI_Explainer_Pro_Detector_Page() )->render(); }
function aiep_render_compliance() { ( new AI_Explainer_Pro_Compliance_Page() )->render(); }
function aiep_render_settings()   { ( new AI_Explainer_Pro_Settings_Page() )->render(); }

/*──────────────────────────────────────────────
 * Admin assets
 *
 * Everything is enqueued via wp_enqueue_*. No inline <script> or <style>
 * blocks are emitted from PHP — small page-specific scripts are registered
 * here and attached via wp_add_inline_script().
 *────────────────────────────────────────────*/
add_action( 'admin_enqueue_scripts', function ( $hook ) {
    if ( false === strpos( $hook, 'ai-explainer-pro' ) ) {
        return;
    }

    wp_enqueue_style(
        'aiep-admin',
        AIEP_PLUGIN_URL . 'admin/css/ai-explainer-pro-admin.css',
        [],
        AIEP_VERSION
    );
    wp_enqueue_style(
        'aiep-pages',
        AIEP_PLUGIN_URL . 'admin/css/ai-explainer-pro-pages.css',
        [],
        AIEP_VERSION
    );

    // Bulk-scan helper on dashboard + compliance pages (not on detector).
    if ( false === strpos( $hook, 'detector' ) ) {
        wp_enqueue_script(
            'aiep-bulk-scan',
            AIEP_PLUGIN_URL . 'admin/js/ai-explainer-pro-bulk-scan.js',
            [ 'jquery' ],
            AIEP_VERSION,
            true
        );
        wp_localize_script( 'aiep-bulk-scan', 'aiepBulkScan', [
            'restUrl' => esc_url_raw( rest_url( 'ai-explainer-pro/v1/bulk-scan' ) ),
            'nonce'   => wp_create_nonce( 'wp_rest' ),
            'i18n'    => [
                'scanning'  => __( 'Scanning...', 'ai-explainer-pro' ),
                'complete'  => __( 'Scan complete!', 'ai-explainer-pro' ),
                'error'     => __( 'Scan error:', 'ai-explainer-pro' ),
                'scanned'   => __( 'scanned', 'ai-explainer-pro' ),
                'remaining' => __( 'remaining', 'ai-explainer-pro' ),
            ],
        ] );
    }

    // Settings-page tab toggles and dashboard chart bootstraps live in this
    // small admin file — also enqueued, never inlined inside a PHP template.
    wp_enqueue_script(
        'aiep-admin',
        AIEP_PLUGIN_URL . 'admin/js/ai-explainer-pro-admin.js',
        [],
        AIEP_VERSION,
        true
    );

    

    do_action( 'aiep_admin_enqueue', $hook );
} );

/**
 * Gutenberg post-editor sidebar (live AI score panel).
 * Enqueued only in the block-editor context.
 */
add_action( 'enqueue_block_editor_assets', function () {
    if ( ! current_user_can( 'edit_posts' ) ) {
        return;
    }
    wp_enqueue_script(
        'aiep-editor-sidebar',
        AIEP_PLUGIN_URL . 'admin/js/ai-explainer-pro-editor-sidebar.js',
        [ 'wp-plugins', 'wp-edit-post', 'wp-element', 'wp-components', 'wp-data', 'wp-api-fetch', 'wp-i18n' ],
        AIEP_VERSION,
        true
    );
} );

/*──────────────────────────────────────────────
 * First-run welcome notice (14-day window, dismissible per-user)
 *────────────────────────────────────────────*/
add_action( 'admin_notices', function () {
    if ( ! current_user_can( 'manage_options' ) ) {
        return;
    }
    $screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
    if ( ! $screen || false === strpos( (string) $screen->id, 'ai-explainer-pro' ) ) {
        return;
    }
    if ( get_user_meta( get_current_user_id(), 'aiep_dismiss_welcome', true ) ) {
        return;
    }
    $activated = (int) get_option( 'ai_explainer_pro_activated', 0 );
    if ( $activated && ( time() - $activated ) > 14 * DAY_IN_SECONDS ) {
        return;
    }
    $dismiss_url = wp_nonce_url(
        add_query_arg( 'aiep_dismiss_welcome', '1' ),
        'aiep_dismiss_welcome'
    );
    ?>
    <div class="aiep-welcome-notice">
        <a href="<?php echo esc_url( $dismiss_url ); ?>" class="button-link-delete" aria-label="<?php esc_attr_e( 'Dismiss welcome message', 'ai-explainer-pro' ); ?>">&times;</a>
        <h3><?php esc_html_e( 'Welcome to AI Explainer', 'ai-explainer-pro' ); ?></h3>
        <p>
            <?php esc_html_e( 'Get the most out of the plugin in three quick steps. The compliance score and badges only become meaningful after a first scan — start there.', 'ai-explainer-pro' ); ?>
        </p>
        <div class="aiep-welcome-steps">
            <a class="button button-primary" href="<?php echo esc_url( admin_url( 'admin.php?page=ai-explainer-pro-compliance' ) ); ?>">
                <?php esc_html_e( '1. Scan my content', 'ai-explainer-pro' ); ?>
            </a>
            <a class="button" href="<?php echo esc_url( admin_url( 'admin.php?page=ai-explainer-pro-detector' ) ); ?>">
                <?php esc_html_e( '2. Try the live detector', 'ai-explainer-pro' ); ?>
            </a>
            <a class="button" href="<?php echo esc_url( admin_url( 'admin.php?page=ai-explainer-pro-settings' ) ); ?>">
                <?php esc_html_e( '3. Configure badges', 'ai-explainer-pro' ); ?>
            </a>
        </div>
    </div>
    <?php
} );

add_action( 'admin_init', function () {
    if ( ! isset( $_GET['aiep_dismiss_welcome'] ) ) {
        return;
    }
    if ( ! current_user_can( 'manage_options' ) ) {
        return;
    }
    check_admin_referer( 'aiep_dismiss_welcome' );
    update_user_meta( get_current_user_id(), 'aiep_dismiss_welcome', 1 );
    wp_safe_redirect( remove_query_arg( [ 'aiep_dismiss_welcome', '_wpnonce' ] ) );
    exit;
} );

/**
 * One-shot redirect to the Get Started wizard the first time an admin
 * loads any admin screen after plugin activation. Skipped for bulk
 * plugin activations (where WP_DOING_AJAX would be set) and for
 * network-admin contexts.
 */
add_action( 'admin_init', function () {
    if ( ! get_transient( 'aiep_redirect_to_getstarted' ) ) {
        return;
    }
    if ( wp_doing_ajax() || is_network_admin() ) {
        return;
    }
    if ( ! current_user_can( 'manage_options' ) ) {
        return;
    }
    // Skip bulk plugin activation (when the user activates several plugins
    // at once): don't yank them out of the plugins screen.
    // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only check of WP-provided query arg, no state change.
    if ( isset( $_GET['activate-multi'] ) ) {
        delete_transient( 'aiep_redirect_to_getstarted' );
        return;
    }
    delete_transient( 'aiep_redirect_to_getstarted' );
    wp_safe_redirect( admin_url( 'admin.php?page=ai-explainer-pro-getstarted' ) );
    exit;
} );

/*──────────────────────────────────────────────
 * Frontend badge on the_content
 *────────────────────────────────────────────*/
add_filter( 'the_content', function ( $content ) {
    if ( ! in_the_loop() || ! is_main_query() ) {
        return $content;
    }

    global $post;
    if ( ! $post ) {
        return $content;
    }

    $should = false;
    if ( is_singular( 'post' ) && get_option( 'ai_explainer_pro_show_on_posts', 1 ) ) {
        $should = true;
    } elseif ( is_page() && get_option( 'ai_explainer_pro_show_on_pages', 0 ) ) {
        $should = true;
    } elseif ( ( is_home() || is_front_page() ) && get_option( 'ai_explainer_pro_show_on_home', 0 ) ) {
        $should = true;
    } elseif ( ( is_archive() || is_category() || is_tag() ) && get_option( 'ai_explainer_pro_show_on_archive', 0 ) ) {
        $should = true;
    }
    if ( ! $should ) {
        return $content;
    }

    if ( empty( get_post_meta( $post->ID, '_ai_explainer_scanned_date', true ) ) ) {
        return $content;
    }

    /** Pro builds may filter to apply category/author exclusions. */
    if ( apply_filters( 'aiep_skip_badge', false, $post ) ) {
        return $content;
    }

    $badge = aiep_build_badge( $post );
    if ( empty( $badge ) ) {
        return $content;
    }

    $position = get_option( 'ai_explainer_pro_badge_position', 'top' );
    if ( 'bottom' === $position ) {
        return $content . $badge;
    } elseif ( 'both' === $position ) {
        return $badge . $content . $badge;
    }
    return $badge . $content;
}, 10 );

/**
 * Build the appropriate badge HTML for a post.
 *
 * @param WP_Post $post The post object.
 * @return string Badge HTML or empty string.
 */
function aiep_build_badge( $post ) {
    $declaration = get_post_meta( $post->ID, '_ai_explainer_content_type', true );
    $show_human  = get_option( 'ai_explainer_pro_show_human_badge', 1 );
    $show_ai     = get_option( 'ai_explainer_pro_show_ai_badge', 1 );
    $template    = get_option( 'ai_explainer_pro_badge_template', 'modern' );

    $badge_mod = '';
    if ( 'rounded' === $template ) {
        $badge_mod = ' aiep-badge--rounded';
    } elseif ( 'minimal' === $template ) {
        $badge_mod = ' aiep-badge--minimal';
    }

    

    if ( ! empty( $declaration ) && 'auto' !== $declaration ) {
        if ( 'human' === $declaration && $show_human ) {
            $title = get_post_meta( $post->ID, '_ai_explainer_manual_override', true )
                ? __( 'Self-Declared Human Content', 'ai-explainer-pro' )
                : __( 'Verified Human Content', 'ai-explainer-pro' );
            return sprintf(
                '<div class="aiep-badge aiep-badge--declared-human%s"><div class="aiep-badge__inner"><span class="aiep-badge__icon">&#x2713;</span><div><p class="aiep-badge__title">%s</p><p class="aiep-badge__subtitle">%s</p></div></div></div>',
                esc_attr( $badge_mod ),
                esc_html( $title ),
                esc_html__( 'Author declares this content as human-written', 'ai-explainer-pro' )
            );
        }
        if ( 'ai' === $declaration && $show_ai ) {
            return sprintf(
                '<div class="aiep-badge aiep-badge--declared-ai%s"><div class="aiep-badge__inner"><span class="aiep-badge__icon">&#x1F916;</span><div><p class="aiep-badge__title">%s</p><p class="aiep-badge__subtitle">%s</p></div></div></div>',
                esc_attr( $badge_mod ),
                esc_html__( 'AI-Generated Content', 'ai-explainer-pro' ),
                esc_html__( 'Author declares this content as AI-generated', 'ai-explainer-pro' )
            );
        }
        return '';
    }

    $human_score = (float) get_post_meta( $post->ID, '_ai_explainer_human_score', true );
    $ai_score    = 1 - $human_score;

    $human_text     = get_option( 'ai_explainer_pro_badge_human_text', __( 'Human Content', 'ai-explainer-pro' ) );
    $ai_text        = get_option( 'ai_explainer_pro_badge_ai_text', __( 'AI Generated', 'ai-explainer-pro' ) );
    $uncertain_text = get_option( 'ai_explainer_pro_badge_uncertain_text', __( 'Mixed Content', 'ai-explainer-pro' ) );

    $human_color     = get_option( 'ai_explainer_pro_badge_human_color', '#10B981' );
    $ai_color        = get_option( 'ai_explainer_pro_badge_ai_color', '#EF4444' );
    $uncertain_color = get_option( 'ai_explainer_pro_badge_uncertain_color', '#F59E0B' );

    if ( $human_score >= 0.7 ) {
        if ( ! $show_human ) {
            return '';
        }
        return sprintf(
            '<div class="aiep-badge aiep-badge--human%s" style="background:%s;"><div class="aiep-badge__inner"><span class="aiep-badge__icon">&#x2713;</span><div><p class="aiep-badge__title">%s</p><p class="aiep-badge__subtitle">%s</p></div></div></div>',
            esc_attr( $badge_mod ),
            esc_attr( $human_color ),
            esc_html( $human_text ),
            /* translators: %d: human probability percentage 0-100 */
            sprintf( esc_html__( 'Human probability: %d%%', 'ai-explainer-pro' ), round( $human_score * 100 ) )
        );
    } elseif ( $human_score >= 0.4 ) {
        return sprintf(
            '<div class="aiep-badge aiep-badge--uncertain%s" style="background:%s;"><div class="aiep-badge__inner"><span class="aiep-badge__icon">&#x26A0;</span><div><p class="aiep-badge__title">%s</p><p class="aiep-badge__subtitle">%s</p></div></div></div>',
            esc_attr( $badge_mod ),
            esc_attr( $uncertain_color ),
            esc_html( $uncertain_text ),
            /* translators: 1: human percentage, 2: AI percentage */
            sprintf( esc_html__( 'Human: %1$d%% | AI: %2$d%%', 'ai-explainer-pro' ), round( $human_score * 100 ), round( $ai_score * 100 ) )
        );
    } else {
        if ( ! $show_ai ) {
            return '';
        }
        return sprintf(
            '<div class="aiep-badge aiep-badge--ai%s" style="background:%s;"><div class="aiep-badge__inner"><span class="aiep-badge__icon">&#x1F916;</span><div><p class="aiep-badge__title">%s</p><p class="aiep-badge__subtitle">%s</p></div></div></div>',
            esc_attr( $badge_mod ),
            esc_attr( $ai_color ),
            esc_html( $ai_text ),
            /* translators: %d: AI probability percentage 0-100 */
            sprintf( esc_html__( 'AI probability: %d%%', 'ai-explainer-pro' ), round( $ai_score * 100 ) )
        );
    }
}

/*──────────────────────────────────────────────
 * Frontend badge CSS
 *────────────────────────────────────────────*/
add_action( 'wp_enqueue_scripts', function () {
    if ( ! ( is_singular() || is_home() || is_archive() ) ) {
        return;
    }
    wp_enqueue_style(
        'aiep-badges',
        AIEP_PLUGIN_URL . 'admin/css/ai-explainer-pro-pages.css',
        [],
        AIEP_VERSION
    );

    
} );

/*──────────────────────────────────────────────
 * Meta box: manual content declaration
 *────────────────────────────────────────────*/
add_action( 'add_meta_boxes', function () {
    add_meta_box(
        'ai_explainer_pro_declaration',
        __( 'AI Explainer — Content Declaration', 'ai-explainer-pro' ),
        'aiep_declaration_metabox',
        [ 'post', 'page' ],
        'side',
        'high'
    );
} );

/**
 * Render the content declaration meta box.
 *
 * @param WP_Post $post Current post.
 */
function aiep_declaration_metabox( $post ) {
    wp_nonce_field( 'aiep_declaration', 'aiep_declaration_nonce' );
    $declaration     = get_post_meta( $post->ID, '_ai_explainer_content_type', true );
    $manual_override = get_post_meta( $post->ID, '_ai_explainer_manual_override', true );
    $human_score     = get_post_meta( $post->ID, '_ai_explainer_human_score', true );
    $scanned_date    = get_post_meta( $post->ID, '_ai_explainer_scanned_date', true );

    if ( ! empty( $scanned_date ) && '' !== $human_score ) :
        $hs  = (float) $human_score;
        $pct = round( $hs * 100 );
        if ( $hs >= 0.7 ) {
            $cls = 'human'; $label = __( 'Human', 'ai-explainer-pro' );
        } elseif ( $hs >= 0.4 ) {
            $cls = 'mixed'; $label = __( 'Mixed', 'ai-explainer-pro' );
        } else {
            $cls = 'ai';    $label = __( 'AI', 'ai-explainer-pro' );
        }
    ?>
    <div class="aiep-metabox-score aiep-metabox-score--<?php echo esc_attr( $cls ); ?>">
        <div class="aiep-metabox-score__head">
            <strong><?php echo esc_html( $label ); ?></strong>
            <span class="aiep-metabox-score__pct"><?php echo esc_html( $pct ); ?>%</span>
        </div>
        <div class="aiep-metabox-score__bar">
            <div class="aiep-metabox-score__bar-fill" style="width:<?php echo esc_attr( $pct ); ?>%;"></div>
        </div>
        <div class="aiep-metabox-score__date">
            <?php
            /* translators: %s: date and time when the content was scanned */
            printf( esc_html__( 'Scanned: %s', 'ai-explainer-pro' ), esc_html( wp_date( get_option( 'date_format' ) . ' ' . get_option( 'time_format' ), strtotime( $scanned_date ) ) ) );
            ?>
        </div>
    </div>
    <?php endif; ?>

    <?php do_action( 'aiep_declaration_metabox_after_score', $post ); ?>

    <div class="aiep-metabox-declaration">
        <p><strong><?php esc_html_e( 'Declare content origin:', 'ai-explainer-pro' ); ?></strong></p>
        <label>
            <input type="radio" name="ai_explainer_content_type" value="human" <?php checked( $declaration, 'human' ); ?>>
            <?php esc_html_e( 'Human-Written', 'ai-explainer-pro' ); ?>
        </label>
        <label>
            <input type="radio" name="ai_explainer_content_type" value="ai" <?php checked( $declaration, 'ai' ); ?>>
            <?php esc_html_e( 'AI-Generated', 'ai-explainer-pro' ); ?>
        </label>
        <label>
            <input type="radio" name="ai_explainer_content_type" value="auto" <?php checked( in_array( $declaration, [ 'auto', '' ], true ) ); ?>>
            <?php esc_html_e( 'Auto-Detect', 'ai-explainer-pro' ); ?>
        </label>
        <hr>
        <label>
            <input type="checkbox" name="ai_explainer_manual_override" value="1" <?php checked( $manual_override, '1' ); ?>>
            <small><?php esc_html_e( 'Override auto-detection', 'ai-explainer-pro' ); ?></small>
        </label>
    </div>
    <?php
}

add_action( 'save_post', function ( $post_id ) {
    if ( ! isset( $_POST['aiep_declaration_nonce'] ) ) {
        return;
    }
    $nonce = sanitize_text_field( wp_unslash( $_POST['aiep_declaration_nonce'] ) );
    if ( ! wp_verify_nonce( $nonce, 'aiep_declaration' ) ) {
        return;
    }
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
        return;
    }
    if ( ! current_user_can( 'edit_post', $post_id ) ) {
        return;
    }
    if ( isset( $_POST['ai_explainer_content_type'] ) ) {
        update_post_meta(
            $post_id,
            '_ai_explainer_content_type',
            sanitize_text_field( wp_unslash( $_POST['ai_explainer_content_type'] ) )
        );
    }
    update_post_meta(
        $post_id,
        '_ai_explainer_manual_override',
        isset( $_POST['ai_explainer_manual_override'] ) ? '1' : ''
    );
} );

/*──────────────────────────────────────────────
 * Activation / Deactivation
 *────────────────────────────────────────────*/
register_activation_hook( __FILE__, function () {
    global $wpdb;

    add_option( 'ai_explainer_pro_version',             AIEP_VERSION );
    add_option( 'ai_explainer_pro_activated',           time() );
    add_option( 'ai_explainer_pro_show_badges',         true );
    add_option( 'ai_explainer_pro_detection_threshold', 0.7 );
    add_option( 'ai_explainer_pro_badge_position',      'top' );
    add_option( 'ai_explainer_pro_show_on_posts',       1 );
    add_option( 'ai_explainer_pro_show_human_badge',    1 );
    add_option( 'ai_explainer_pro_show_ai_badge',       1 );
    add_option( 'aiep_authenticity_enabled',            1 );   // Sensible default: public page on.
    // aiep_scraper_defense_enabled is intentionally NOT set on activation:
    // we don't touch the user's robots.txt without explicit opt-in.

    // Always queue a redirect to the Get Started wizard on the next admin
    // page load. The transient is consumed (and self-deleted) by an
    // admin_init handler, so this fires once per activation — even on
    // re-activation during development.
    set_transient( 'aiep_redirect_to_getstarted', 1, 60 );

    require_once ABSPATH . 'wp-admin/includes/upgrade.php';
    $charset = $wpdb->get_charset_collate();
    $table   = $wpdb->prefix . 'ai_explainer_scan_history';
    dbDelta( "CREATE TABLE {$table} (
        id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
        scan_date datetime NOT NULL,
        total_scanned int(11) DEFAULT 0,
        scan_results longtext,
        user_id bigint(20) DEFAULT 0,
        PRIMARY KEY  (id),
        KEY scan_date (scan_date)
    ) {$charset};" );

    do_action( 'aiep_activated' );

    // Authenticity rewrite rules: register them explicitly here. Hooking
    // to `init` isn't enough because `init` does not fire during plugin
    // activation, so flush_rewrite_rules() below would persist a rewrite
    // table that doesn't yet contain our /authenticity rule.
    if ( class_exists( 'AIEP_Authenticity' ) ) {
        AIEP_Authenticity::add_rewrite_rules();
    }

    flush_rewrite_rules();
} );

register_deactivation_hook( __FILE__, function () {
    do_action( 'aiep_deactivated' );
    flush_rewrite_rules();
} );

/*──────────────────────────────────────────────
 * WordPress Dashboard Widget
 *────────────────────────────────────────────*/
add_action( 'wp_dashboard_setup', function () {
    wp_add_dashboard_widget(
        'aiep_dashboard_widget',
        __( 'AI Explainer — Content Overview', 'ai-explainer-pro' ),
        'aiep_dashboard_widget_render'
    );
} );

function aiep_dashboard_widget_render() {
    global $wpdb;

    $total_posts = (int) wp_count_posts( 'post' )->publish + (int) wp_count_posts( 'page' )->publish;
    // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery,WordPress.DB.DirectDatabaseQuery.NoCaching -- Dashboard widget reads aggregate counts on demand; caching would stale data after every scan.
    $scanned     = (int) $wpdb->get_var(
        "SELECT COUNT(DISTINCT post_id) FROM {$wpdb->postmeta} WHERE meta_key = '_ai_explainer_scanned_date'"
    );
    // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery,WordPress.DB.DirectDatabaseQuery.NoCaching
    $human       = (int) $wpdb->get_var( $wpdb->prepare(
        "SELECT COUNT(DISTINCT post_id) FROM {$wpdb->postmeta} WHERE meta_key = '_ai_explainer_human_score' AND CAST(meta_value AS DECIMAL(5,3)) >= %f", 0.7
    ) );
    // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery,WordPress.DB.DirectDatabaseQuery.NoCaching
    $ai          = (int) $wpdb->get_var( $wpdb->prepare(
        "SELECT COUNT(DISTINCT post_id) FROM {$wpdb->postmeta} WHERE meta_key = '_ai_explainer_human_score' AND CAST(meta_value AS DECIMAL(5,3)) < %f", 0.4
    ) );
    $mixed       = max( 0, $scanned - $human - $ai );
    $unscanned   = max( 0, $total_posts - $scanned );

    $compliance  = AI_Explainer_Pro_Compliance::evaluate();

    echo '<div class="aiep-widget-grid">';
    printf( '<div class="aiep-widget-stat aiep-widget-stat--scanned"><strong>%s</strong><small>%s</small></div>', esc_html( $scanned ), esc_html__( 'Scanned', 'ai-explainer-pro' ) );
    printf( '<div class="aiep-widget-stat aiep-widget-stat--human"><strong>%s</strong><small>%s</small></div>',   esc_html( $human ),   esc_html__( 'Human', 'ai-explainer-pro' ) );
    printf( '<div class="aiep-widget-stat aiep-widget-stat--mixed"><strong>%s</strong><small>%s</small></div>',   esc_html( $mixed ),   esc_html__( 'Mixed', 'ai-explainer-pro' ) );
    printf( '<div class="aiep-widget-stat aiep-widget-stat--ai"><strong>%s</strong><small>%s</small></div>',      esc_html( $ai ),      esc_html__( 'AI', 'ai-explainer-pro' ) );
    echo '</div>';

    if ( $unscanned > 0 ) {
        echo '<p class="aiep-widget-note">';
        /* translators: %d: number of unscanned content items remaining */
        printf( esc_html__( '%d unscanned content items remaining.', 'ai-explainer-pro' ), (int) $unscanned );
        echo '</p>';
    }

    echo '<p class="aiep-widget-compliance">';
    printf(
        '<strong>%s</strong> <span class="aiep-widget-compliance__score aiep-widget-compliance__score--%s">%d%%</span> <small>(%d/%d)</small>',
        esc_html__( 'EU AI Act transparency:', 'ai-explainer-pro' ),
        esc_attr( $compliance['risk'] ),
        (int) $compliance['score'],
        (int) $compliance['passed'],
        (int) $compliance['total']
    );
    echo '</p>';

    echo '<p>';
    printf(
        '<a href="%s" class="button button-primary">%s</a> <a href="%s" class="button">%s</a>',
        esc_url( admin_url( 'admin.php?page=ai-explainer-pro' ) ),
        esc_html__( 'Dashboard', 'ai-explainer-pro' ),
        esc_url( admin_url( 'admin.php?page=ai-explainer-pro-compliance' ) ),
        esc_html__( 'Compliance', 'ai-explainer-pro' )
    );
    echo '</p>';
}

/*──────────────────────────────────────────────
 * Plugin action links
 *────────────────────────────────────────────*/
add_filter( 'plugin_action_links_' . AIEP_PLUGIN_BASENAME, function ( $links ) {
    $settings_link = sprintf(
        '<a href="%s">%s</a>',
        esc_url( admin_url( 'admin.php?page=ai-explainer-pro-settings' ) ),
        esc_html__( 'Settings', 'ai-explainer-pro' )
    );
    array_unshift( $links, $settings_link );

    

    return apply_filters( 'aiep_plugin_action_links', $links );
} );