<?php
/**
 * Plugin Name: WP Agentic Writer
 * Plugin URI: https://github.com/wp-agentic-writer
 * Description: Plan-first AI writing workflow for WordPress. Scribble → Research → Plan → Execute → Revise
 * Version: 0.1.3
 * Author: WP Agentic Writer
 * Author URI: https://github.com/wp-agentic-writer
 * License: GPL-2.0+
 * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
 * Text Domain: wp-agentic-writer
 * Domain Path: /languages
 * Requires at least: 6.6
 * Requires PHP: 7.4
 *
 * @package WP_Agentic_Writer
 */

// Exit if accessed directly.
if (!defined("ABSPATH")) {
    exit();
}

// Plugin version.
define("WP_AGENTIC_WRITER_VERSION", "0.1.3");

// Plugin file path.
define("WP_AGENTIC_WRITER_FILE", __FILE__);

// Plugin directory path.
define("WP_AGENTIC_WRITER_DIR", plugin_dir_path(__FILE__));

// Alias for backward compatibility.
define("WPAW_PLUGIN_DIR", WP_AGENTIC_WRITER_DIR);

// Plugin directory URL (plugin_dir_url already includes trailing slash).
define(
    "WP_AGENTIC_WRITER_URL",
    untrailingslashit(plugin_dir_url(__FILE__)) . "/",
);

// Include autoloader.
require_once WP_AGENTIC_WRITER_DIR . "includes/class-autoloader.php";

// Include provider interface and manager.
require_once WP_AGENTIC_WRITER_DIR . "includes/interface-ai-provider.php";
require_once WP_AGENTIC_WRITER_DIR . "includes/class-provider-manager.php";

// Include WordPress 7.0 AI Client wrapper (backward compatible).
require_once WP_AGENTIC_WRITER_DIR . "includes/class-wp-ai-client-wrapper.php";

// Include conversation manager for session-based chat history.
require_once WP_AGENTIC_WRITER_DIR .
    "includes/class-conversation-migration.php";
require_once WP_AGENTIC_WRITER_DIR . "includes/class-conversation-manager.php";

// Include model registry for centralized model defaults.
require_once WP_AGENTIC_WRITER_DIR . "includes/class-model-registry.php";

// Include shared REST rate limiter used by endpoint controllers.
require_once WP_AGENTIC_WRITER_DIR . "includes/class-rate-limiter.php";

// Initialize the plugin.
function wp_agentic_writer_init()
{
    // Load plugin text domain.
    load_plugin_textdomain(
        "wp-agentic-writer",
        false,
        dirname(plugin_basename(__FILE__)) . "/languages/",
    );

    // Always initialize Gutenberg sidebar for REST API routes.
    WP_Agentic_Writer_Gutenberg_Sidebar::get_instance();

    // Always initialize cost tracker hooks (REST API calls need this).
    WP_Agentic_Writer_Cost_Tracker::get_instance();

    // Schedule image cleanup cron job if not already scheduled.
    if (!wp_next_scheduled("wpaw_cleanup_temp_images")) {
        wp_schedule_event(time(), "daily", "wpaw_cleanup_temp_images");
    }

    // Initialize SEO Schema Agent
    WP_Agentic_Writer_SEO_Schema::get_instance();

    // Check if we're on the admin side.
    if (is_admin()) {
        // Initialize settings V2.
        require_once WP_AGENTIC_WRITER_DIR . "includes/class-settings-v2.php";
        WP_Agentic_Writer_Settings_V2::get_instance();

        // Initialize admin columns.
        WP_Agentic_Writer_Admin_Columns::get_instance();
    }
}
add_action("plugins_loaded", "wp_agentic_writer_init");

// Hook for image cleanup cron job.
add_action("wpaw_cleanup_temp_images", "wp_agentic_writer_cleanup_temp_images");

/**
 * Cleanup old temp images (7+ days).
 *
 * @since 0.1.0
 */
function wp_agentic_writer_cleanup_temp_images()
{
    WP_Agentic_Writer_Image_Manager::get_instance()->cleanup_old_temp_images();
}

// Activation hook.
register_activation_hook(__FILE__, "wp_agentic_writer_activate");

/**
 * Plugin activation.
 *
 * @since 0.1.0
 */
function wp_agentic_writer_activate()
{
    // Set default options using model registry for consistency.
    $registry_defaults = WPAW_Model_Registry::get_activation_defaults();
    $default_options = [
        "openrouter_api_key" => "",
        "planning_model" => $registry_defaults["planning_model"],
        "execution_model" => $registry_defaults["execution_model"],
        "image_model" => $registry_defaults["image_model"],
        "web_search_enabled" => false,
        "search_engine" => "auto",
        "search_depth" => "medium",
        "cost_tracking_enabled" => true,
        "enable_clarification_quiz" => true,
        "clarity_confidence_threshold" => "0.6",
        "chat_history_limit" => 20,
        "preferred_languages" => ["auto", "English", "Indonesian"],
        "custom_languages" => [],
    ];

    add_option("wp_agentic_writer_settings", $default_options);

    // Set default custom models from registry (separate option for custom models)
    $registry = WPAW_Model_Registry::get_registry();
    $default_custom_models = [];
    foreach ($registry["image_models"] as $id => $name) {
        $default_custom_models[] = [
            "id" => $id,
            "name" => $name,
            "type" => "image",
        ];
    }
    add_option("wp_agentic_writer_custom_models", $default_custom_models);

    // Create cost tracking table.
    wp_agentic_writer_create_cost_table();

    // Create image management tables.
    WP_Agentic_Writer_Image_Manager::get_instance()->create_tables();

    // Create conversations table.
    require_once WP_AGENTIC_WRITER_DIR .
        "includes/class-conversation-migration.php";
    wpaw_create_conversations_table();
}

/**
 * Create cost tracking table.
 *
 * @since 0.1.0
 */
function wp_agentic_writer_create_cost_table()
{
    global $wpdb;

    $table_name = $wpdb->prefix . "wpaw_cost_tracking";
    $charset_collate = $wpdb->get_charset_collate();

    $sql = "CREATE TABLE $table_name (
		id bigint(20) NOT NULL AUTO_INCREMENT,
		post_id bigint(20) NOT NULL,
		session_id varchar(32) DEFAULT '' NOT NULL,
		model varchar(255) NOT NULL,
		provider varchar(50) DEFAULT 'openrouter' NOT NULL,
		action varchar(50) NOT NULL,
		input_tokens int(11) NOT NULL,
		output_tokens int(11) NOT NULL,
		cost decimal(10,6) NOT NULL,
		status varchar(20) DEFAULT 'success' NOT NULL,
		created_at datetime DEFAULT CURRENT_TIMESTAMP NOT NULL,
		PRIMARY KEY  (id),
		KEY post_id (post_id),
		KEY session_id (session_id),
		KEY provider (provider),
		KEY action (action),
		KEY created_at (created_at)
	) $charset_collate;";

    require_once ABSPATH . "wp-admin/includes/upgrade.php";
    dbDelta($sql);
}

// Version-based table creation (runs on plugins_loaded to ensure tables exist).
add_action("plugins_loaded", "wp_agentic_writer_maybe_create_tables");

/**
 * Create database tables if they don't exist or version is outdated.
 *
 * @since 0.1.0
 */
function wp_agentic_writer_maybe_create_tables()
{
    // Cost tracking table - controlled by main db version.
    $current_version = get_option("wpaw_db_version", "0");
    $required_version = "1.1.0";

    if (version_compare($current_version, $required_version, "<")) {
        // Create cost tracking table.
        wp_agentic_writer_create_cost_table();

        // Create image management tables.
        WP_Agentic_Writer_Image_Manager::get_instance()->create_tables();

        // Create conversations table (migrate if needed).
        if (!function_exists("wpaw_create_conversations_table")) {
            require_once WP_AGENTIC_WRITER_DIR .
                "includes/class-conversation-migration.php";
        }
        wpaw_create_conversations_table();

        // Update version.
        update_option("wpaw_db_version", $required_version);
    } else {
        // Even if main version is current, still check conversation table independently.
        if (!function_exists("wpaw_create_conversations_table")) {
            require_once WP_AGENTIC_WRITER_DIR .
                "includes/class-conversation-migration.php";
        }

        $conv_version = get_option("wpaw_conversations_db_version", "0");
        if (version_compare($conv_version, "0.1.4", "<")) {
            wpaw_create_conversations_table();
        }
    }
}

// Deactivation hook.
register_deactivation_hook(__FILE__, "wp_agentic_writer_deactivate");

/**
 * Plugin deactivation.
 *
 * @since 0.1.0
 */
function wp_agentic_writer_deactivate()
{
    // Clear scheduled cron jobs.
    $timestamp = wp_next_scheduled("wpaw_cleanup_temp_images");
    if ($timestamp) {
        wp_unschedule_event($timestamp, "wpaw_cleanup_temp_images");
    }
    wp_clear_scheduled_hook("wpaw_cleanup_old_sessions");
}

// Uninstall hook.
register_uninstall_hook(__FILE__, "wp_agentic_writer_uninstall");

/**
 * Plugin uninstall.
 *
 * Removes all plugin data including settings, database tables,
 * post meta, user meta, transients, scheduled events, and temp files.
 *
 * @since 0.1.0
 */
function wp_agentic_writer_uninstall()
{
    global $wpdb;

    // Delete options.
    delete_option("wp_agentic_writer_settings");
    delete_option("wpaw_db_version");
    delete_option("wpaw_conversations_db_version");
    delete_option("wp_agentic_writer_custom_models");

    // Delete post meta.
    $post_meta_keys = [
        "_wpaw_plan",
        "_wpaw_chat_history",
        "_wpaw_memory",
        "_wpaw_post_config",
        "_wpaw_focus_keyword",
        "_wpaw_writing_status",
        "_wpaw_current_section",
        "_wpaw_sections_written",
        "_wpaw_writing_state_updated",
        "_wpaw_plan_id",
        "_wpaw_resume_token",
    ];
    foreach ($post_meta_keys as $key) {
        delete_post_meta_by_key($key);
    }

    // Delete user meta.
    $wpdb->query(
        $wpdb->prepare(
            "DELETE FROM {$wpdb->usermeta} WHERE meta_key LIKE %s",
            "wpaw_%",
        ),
    );

    // Delete database tables.
    $tables = [
        $wpdb->prefix . "wpaw_cost_tracking",
        $wpdb->prefix . "wpaw_images",
        $wpdb->prefix . "wpaw_images_variants",
        $wpdb->prefix . "wpaw_conversations",
    ];
    foreach ($tables as $table) {
        $wpdb->query("DROP TABLE IF EXISTS {$table}");
    }

    // Clear transients.
    delete_transient("wpaw_openrouter_models");
    delete_transient("wpaw_openrouter_model_objects");
    delete_transient("wpaw_openrouter_model_ids");

    // Unschedule cron events.
    wp_clear_scheduled_hook("wpaw_cleanup_old_sessions");
    wp_clear_scheduled_hook("wpaw_daily_cleanup");

    // Delete temp image directory.
    $upload_dir = wp_upload_dir();
    $temp_dir = $upload_dir["basedir"] . "/wpaw";
    if (file_exists($temp_dir)) {
        $files = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator(
                $temp_dir,
                RecursiveDirectoryIterator::SKIP_DOTS,
            ),
            RecursiveIteratorIterator::CHILD_FIRST,
        );
        foreach ($files as $fileinfo) {
            $todo = $fileinfo->isDir() ? "rmdir" : "unlink";
            $todo($fileinfo->getRealPath());
        }
        rmdir($temp_dir);
    }
}