<?php
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Metadata pemakaian barang yang masih berada dalam penguasaan teknisi.
 * Kolom status lama (active/inactive) tetap dipertahankan sebagai status
 * serah-terima agar alur pengembalian yang sudah berjalan tidak berubah.
 */
class Migration_Complete_technician_item_usage extends CI_Migration
{
    public function up()
    {
        if (!$this->db->table_exists('item_technician')) return;

        $columns = array(
            'usage_status' => "VARCHAR(30) NOT NULL DEFAULT 'carried' AFTER status",
            'usage_date' => 'DATE NULL AFTER usage_status',
            'customer_id' => 'BIGINT UNSIGNED NULL AFTER usage_date',
            'usage_notes' => 'TEXT NULL AFTER customer_id',
            'updated_by' => 'BIGINT UNSIGNED NULL AFTER usage_notes',
            'updated_at' => 'DATETIME NULL AFTER updated_by'
        );
        foreach ($columns as $name => $definition) {
            if (!$this->db->field_exists($name, 'item_technician')) {
                $this->db->query('ALTER TABLE item_technician ADD `'.$name.'` '.$definition);
            }
        }

        $this->db->query("UPDATE item_technician SET usage_status='carried' WHERE usage_status IS NULL OR usage_status='' OR usage_status NOT IN('carried','installed')");
        $index = $this->db->query("SELECT 1 FROM information_schema.statistics WHERE table_schema=DATABASE() AND table_name='item_technician' AND index_name='idx_item_technician_usage' LIMIT 1")->row();
        if (!$index) {
            $this->db->query('ALTER TABLE item_technician ADD KEY idx_item_technician_usage(company_id,user_id,status,usage_status,customer_id,usage_date)');
        }
    }

    public function down()
    {
        throw new RuntimeException('Gunakan backup untuk mengembalikan metadata penggunaan barang teknisi.');
    }
}