<?php

namespace Ulmus\Adapter;

use Ulmus\{ConnectionAdapter, Entity\InformationSchema\Table, Migration\FieldDefinition, Repository, QueryBuilder};

trait DefaultAdapterTrait
{
    public function repositoryClass() : string
    {
        return Repository::class;
    }

    public function queryBuilderClass() : string
    {
        return QueryBuilder::class;
    }

    public function tableSyntax() : array
    {
        return [
            'ai' => "AUTO_INCREMENT",
            'pk' => "PRIMARY KEY",
            'unsigned' => "UNSIGNED",
        ];
    }

    public function databaseName() : string
    {
        return $this->database;
    }

    public function schemaTable(ConnectionAdapter $parent, $databaseName, string $tableName) /* : ? object */
    {
        return Table::repository(Repository::DEFAULT_ALIAS, $parent)->where($this->escapeIdentifier('table_schema', AdapterInterface::IDENTIFIER_FIELD), $databaseName)->loadOneFromField($this->escapeIdentifier('table_name', AdapterInterface::IDENTIFIER_FIELD), $tableName);
    }

    public function mapFieldType(FieldDefinition $field, bool $typeOnly = false) : string
    {
        $type = $field->type;

        $length = $field->length;

        if ( is_a($type, Entity\Field\Date::class, true) ) {
            $type = "DATE";
        }
        elseif ( is_a($type, Entity\Field\Time::class, true) ) {
            $type = "TIME";
        }
        elseif ( is_a($type, \DateTime::class, true) ) {
            $type = "DATETIME";
        }

        switch($type) {
            case "bool":
                $type = "TINYINT";
                $length = 1;
                break;

            case "array":
            case "string":
                if ($length && $length <= 255) {
                    $type = "VARCHAR";
                    break;
                }
                elseif (! $length || ( $length <= 65535 ) ) {
                    $type = "TEXT";
                }
                elseif ( $length <= 16777215 ) {
                    $type = "MEDIUMTEXT";
                }
                elseif ($length <= 4294967295) {
                    $type = "LONGTEXT";
                }
                else {
                    throw new \Exception("A column with size bigger than 4GB cannot be created.");
                }

                # Length is unnecessary on TEXT fields
                unset($length);

                break;

            case "float":
                $type = "DOUBLE";
                break;

            default:
                $type = strtoupper($type);
                break;
        }

        return $typeOnly ? $type : $type . ( isset($length) ? "($length" . ( ! empty($precision) ? ",$precision" : "" ) . ")" : "" );
    }
}