<?php
if (!defined('ABSPATH')) exit;

/**
 * Create plugin database tables on activation and remove them on deactivation.
 */
function kc_install_tables() {
    global $wpdb;
    $prefix = $wpdb->prefix;
    $charset_collate = $wpdb->get_charset_collate();
    require_once(ABSPATH . 'wp-admin/includes/upgrade.php');

    // --- Tabellen-Definitionen ---
    $tables_sql = [];

    // Wahl-Tabelle
    $tables_sql[] = "CREATE TABLE {$prefix}kc_wahlen (
        id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
        name varchar(191) NOT NULL,
        beschreibung text DEFAULT NULL,
        anzahl_einheiten tinyint NOT NULL DEFAULT 1,
        min_kapazitaet int NOT NULL DEFAULT 0,
        max_kapazitaet int NOT NULL DEFAULT 0,
        freigegeben tinyint(1) NOT NULL DEFAULT 0,
        deleted tinyint(1) NOT NULL DEFAULT 0,
        PRIMARY KEY (id)
    ) $charset_collate";

    // Workshop-Tabelle
    $tables_sql[] = "CREATE TABLE {$prefix}kc_workshops (
        id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
        name varchar(191) NOT NULL,
        beschreibung text DEFAULT NULL,
        max_teilnehmer int NOT NULL DEFAULT 0,
        min_teilnehmer int NOT NULL DEFAULT 0,
        PRIMARY KEY (id)
    ) $charset_collate";

    // Teamer-Tabelle
    $tables_sql[] = "CREATE TABLE {$prefix}kc_teamer (
        id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
        vorname varchar(191) DEFAULT NULL,
        nachname varchar(191) DEFAULT NULL,
        PRIMARY KEY (id)
    ) $charset_collate";

    // Teilnehmer-Tabelle
    $tables_sql[] = "CREATE TABLE {$prefix}kc_teilnehmer (
        id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
        vorname varchar(191) DEFAULT NULL,
        nachname varchar(191) DEFAULT NULL,
        wahl_id bigint(20) unsigned NOT NULL DEFAULT 0,
        phase tinyint NOT NULL DEFAULT 1,
        wunsch1 bigint(20) unsigned DEFAULT NULL,
        wunsch2 bigint(20) unsigned DEFAULT NULL,
        wunsch3 bigint(20) unsigned DEFAULT NULL,
        deleted tinyint(1) NOT NULL DEFAULT 0,
        PRIMARY KEY (id)
    ) $charset_collate";

    // Zuordnungstabelle Wahl <-> Workshops
    $tables_sql[] = "CREATE TABLE {$prefix}kc_wahl_workshops (
        id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
        wahl_id bigint(20) unsigned NOT NULL DEFAULT 0,
        workshop_id bigint(20) unsigned NOT NULL DEFAULT 0,
        phase tinyint NOT NULL DEFAULT 1,
        PRIMARY KEY (id)
    ) $charset_collate";

    // Manuelle (Force-)Zuteilungen
    $tables_sql[] = "CREATE TABLE {$prefix}kc_force_zuteilung (
        id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
        teilnehmer_id bigint(20) unsigned NOT NULL DEFAULT 0,
        wahl_id bigint(20) unsigned NOT NULL DEFAULT 0,
        phase tinyint NOT NULL DEFAULT 1,
        workshop_id bigint(20) unsigned DEFAULT NULL,
        kommentar text DEFAULT NULL,
        PRIMARY KEY (id)
    ) $charset_collate";

    // Ergebnis-Zuteilungen
    $tables_sql[] = "CREATE TABLE {$prefix}kc_zuteilung (
        id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
        teilnehmer_id bigint(20) unsigned NOT NULL DEFAULT 0,
        vorname varchar(191) DEFAULT NULL,
        nachname varchar(191) DEFAULT NULL,
        wahl_id bigint(20) unsigned NOT NULL DEFAULT 0,
        phase tinyint NOT NULL DEFAULT 1,
        workshop_id bigint(20) unsigned DEFAULT NULL,
        wunsch_rang tinyint DEFAULT NULL,
        PRIMARY KEY (id)
    ) $charset_collate";

    // Zuordnung Workshop <-> Teamer
    $tables_sql[] = "CREATE TABLE {$prefix}kc_workshop_teamer (
        id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
        workshop_id bigint(20) unsigned DEFAULT NULL,
        teamer_id bigint(20) unsigned DEFAULT NULL,
        PRIMARY KEY (id)
    ) $charset_collate";

    // Tabellen anlegen
    foreach ($tables_sql as $sql) {
        dbDelta($sql);
    }

    // Migration: min_teilnehmer nachziehen, falls bei Update nötig
    $col = $wpdb->get_var($wpdb->prepare("SHOW COLUMNS FROM {$prefix}kc_workshops LIKE %s", 'min_teilnehmer'));
    if (empty($col)) {
        $wpdb->query("ALTER TABLE {$prefix}kc_workshops ADD COLUMN min_teilnehmer INT NOT NULL DEFAULT 0");
    }

    // Plugin-Version speichern
    add_option('kc_workshopwahl_db_version', '1.0');
}

function kc_uninstall_tables() {
    global $wpdb;
    $prefix = $wpdb->prefix;

    $tables = [
        "{$prefix}kc_zuteilung",
        "{$prefix}kc_force_zuteilung",
        "{$prefix}kc_wahl_workshops",
        "{$prefix}kc_teilnehmer",
        "{$prefix}kc_teamer",
        "{$prefix}kc_workshops",
        "{$prefix}kc_wahlen",
		"{$prefix}kc_workshop_teamer"
    ];

    foreach ($tables as $t) {
        $wpdb->query("DROP TABLE IF EXISTS $t");
    }

    delete_option('kc_workshopwahl_db_version');
}

// Backwards-compat wrapper for register_activation_hook usage
if (!function_exists('kc_register_hooks_internal')) {
    function kc_register_hooks_internal() {
        // intentionally left blank
    }
}

?>