<?php


namespace app\common\model;

use EasySwoole\DDL\Blueprint\Table;
use EasySwoole\DDL\DDLBuilder;
use EasySwoole\DDL\Enum\Character;
use think\facade\Db;
use think\Model;

abstract class BaseModel extends Model
{
    protected static $instance;
    protected $comment = "表名备注";

    /**
     * @return static
     */
    public static function Inst()
    {
        $t = get_called_class();
        if (empty(static::$instance[$t])) {
            static::$instance[$t] = new static();
        }
        return static::$instance[$t];
    }

    /**
     * 初始化表
     */
    public function initTable()
    {
        $sql = DDLBuilder::table($this->getTable(), function (Table $table) {
            $table->setIfNotExists()->setTableComment($this->comment);   //设置表名称
            $table->setTableCharset(Character::UTF8MB4_GENERAL_CI);//设置表字符集
            $table->colInt('id')->setIsAutoIncrement()->setIsPrimaryKey()->setIsUnsigned()->setColumnComment('主键id');
            $table->colDateTime('created_at')->setDefaultValue("CURRENT_TIMESTAMP")->setColumnComment('创建时间');
            $table->colDateTime('updated_at')->setDefaultValue("CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP")->setColumnComment('更新时间');
        });
        Db::query($sql);
        $ori_fields = $this->db()->getTableFields($this->getTable());
        $new_fields = $this->generateTableField();
        $start = $ori_fields[count($ori_fields) - 3];
        foreach ($new_fields as $k => $v) {
            if (!in_array($k, $ori_fields)) {
                $sql = "ALTER TABLE {$this->getTable()} add $v AFTER $start";
                Db::execute($sql);
                $start = $k;
            }
        }
    }

    abstract protected function generateTableField(): array;
}