<?php
/**
 * Fired during plugin activation.
 *
 * Creates database tables and schedules the cron event.
 *
 * @since 1.0.0
 */
class Peptide_News_Activator {

    /**
     * Create custom tables and schedule cron.
     */
    public static function activate() {
        self::create_tables();
        self::set_default_options();
        self::schedule_cron();
    }

    /**
     * Create the articles and analytics database tables.
     */
    private static function create_tables() {
        global $wpdb;

        $charset_collate = $wpdb->get_charset_collate();

        // Articles table — stores fetched news data for analysis.
        $articles_table = $wpdb->prefix . 'peptide_news_articles';
        $sql_articles   = "CREATE TABLE {$articles_table} (
            id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
            source VARCHAR(100) NOT NULL DEFAULT '',
            source_url VARCHAR(2048) NOT NULL DEFAULT '',
            title TEXT NOT NULL,
            excerpt TEXT NOT NULL,
            content LONGTEXT NOT NULL DEFAULT '',
            author VARCHAR(255) NOT NULL DEFAULT '',
            thumbnail_url VARCHAR(2048) NOT NULL DEFAULT '',
            published_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
            fetched_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
            categories VARCHAR(500) NOT NULL DEFAULT '',
            tags VARCHAR(500) NOT NULL DEFAULT '',
            language VARCHAR(10) NOT NULL DEFAULT 'en',
            sentiment_score FLOAT DEFAULT NULL,
            hash VARCHAR(64) NOT NULL DEFAULT '',
            is_active TINYINT(1) NOT NULL DEFAULT 1,
            PRIMARY KEY (id),
            UNIQUE KEY hash (hash),
            KEY idx_published (published_at),
            KEY idx_source (source),
            KEY idx_active_published (is_active, published_at)
        ) {$charset_collate};";

        // Click analytics table — one row per click event.
        $clicks_table = $wpdb->prefix . 'peptide_news_clicks';
        $sql_clicks   = "CREATE TABLE {$clicks_table} (
            id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
            article_id BIGINT(20) UNSIGNED NOT NULL,
            clicked_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
            user_ip VARCHAR(45) NOT NULL DEFAULT '',
            user_agent TEXT NOT NULL DEFAULT '',
            referrer_url VARCHAR(2048) NOT NULL DEFAULT '',
            page_url VARCHAR(2048) NOT NULL DEFAULT '',
            session_id VARCHAR(64) NOT NULL DEFAULT '',
            user_id BIGINT(20) UNSIGNED DEFAULT NULL,
            country VARCHAR(2) NOT NULL DEFAULT '',
            device_type VARCHAR(20) NOT NULL DEFAULT '',
            PRIMARY KEY (id),
            KEY idx_article (article_id),
            KEY idx_clicked_at (clicked_at),
            KEY idx_session (session_id),
            KEY idx_article_date (article_id, clicked_at)
        ) {$charset_collate};";

        // Daily aggregates table — for fast trend queries.
        $daily_table = $wpdb->prefix . 'peptide_news_daily_stats';
        $sql_daily   = "CREATE TABLE {$daily_table} (
            id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
            article_id BIGINT(20) UNSIGNED NOT NULL,
            stat_date DATE NOT NULL,
            click_count INT UNSIGNED NOT NULL DEFAULT 0,
            unique_visitors INT UNSIGNED NOT NULL DEFAULT 0,
            PRIMARY KEY (id),
            UNIQUE KEY idx_article_date (article_id, stat_date),
            KEY idx_date (stat_date)
        ) {$charset_collate};";

        require_once ABSPATH . 'wp-admin/includes/upgrade.php';

        dbDelta( $sql_articles );
        dbDelta( $sql_clicks );
        dbDelta( $sql_daily );

        update_option( 'peptide_news_db_version', PEPTIDE_NEWS_VERSION );
    }

    /**
     * Set sensible default option values.
     */
    private static function set_default_options() {
        $defaults = array(
            'fetch_interval'       => 'twicedaily',
            'articles_count'       => 10,
            'newsapi_key'          => '',
            'newsapi_enabled'      => 0,
            'rss_feeds'            => implode( "\n", array(
                'https://news.google.com/rss/search?q=peptide+research&hl=en-US&gl=US&ceid=US:en',
                'https://pubmed.ncbi.nlm.nih.gov/rss/search/1sUlVGjEXm1YN9QiGPblv_-bwB51JCtyLwVX85CVGDKCHFFR9Q/?limit=20&utm_campaign=pubmed-2&fc=20220101000000',
            ) ),
            'rss_enabled'          => 1,
            'search_keywords'      => 'peptide, peptides, peptide therapy, peptide research, BPC-157, Thymosin, GHK-Cu',
            'thumbnail_fallback'   => PEPTIDE_NEWS_PLUGIN_URL . 'public/images/default-thumb.png',
            'article_retention'    => 90,
            'analytics_retention'  => 365,
            'anonymize_ip'         => 1,
        );

        foreach ( $defaults as $key => $value ) {
            if ( false === get_option( "peptide_news_{$key}" ) ) {
                add_option( "peptide_news_{$key}", $value );
            }
        }
    }

    /**
     * Schedule the cron event based on the configured interval.
     */
    private static function schedule_cron() {
        $interval = get_option( 'peptide_news_fetch_interval', 'twicedaily' );

        if ( ! wp_next_scheduled( 'peptide_news_cron_fetch' ) ) {
            wp_schedule_event( time(), $interval, 'peptide_news_cron_fetch' );
        }
    }
}