<?php namespace SokoWeb\Database;

use SokoWeb\Interfaces\Database\IAuditLogger;
use SokoWeb\Interfaces\Database\IConnection;

abstract class AuditLoggerBase implements IAuditLogger
{
    const LOG_TYPE_INSERT = 'insert';
    const LOG_TYPE_UPDATE = 'update';
    const LOG_TYPE_DELETE = 'delete';

    private IConnection $connection;

    private string $logTable;

    public function __construct(IConnection $connection, string $logTable)
    {
        $this->connection = $connection;
        $this->logTable = $logTable;
    }

    public function logInsert(string $localTable, $localId): void
    {
        $data = [
            'local_table' => $localTable,
            'local_id' => $localId,
            'type' => static::LOG_TYPE_INSERT,
            'modifier_id' => $this->getModifierId(),
        ];

        $query = 'INSERT INTO ' . Utils::backtick($this->logTable) . ' SET ' . Utils::generateColumnsWithBinding(array_keys($data));
        $stmt = $this->connection->prepare($query);
        $stmt->execute($data);
    }

    public function logUpdate(string $localTable, $localId, array $diff): void
    {
        $data = [
            'local_table' => $localTable,
            'local_id' => $localId,
            'type' => static::LOG_TYPE_UPDATE,
            'modifier_id' => $this->getModifierId(),
            'column' => null,
            'old' => null,
            'new' => null,
        ];

        $query = 'INSERT INTO ' . Utils::backtick($this->logTable) . ' SET ' . Utils::generateColumnsWithBinding(array_keys($data));
        $stmt = $this->connection->prepare($query);

        foreach ($diff as $name => $values) {
            $data['column'] = $name;
            $data['old'] = $values['old'];
            $data['new'] = $values['new'];
            $stmt->execute($data);
        }
    }

    public function logDelete(string $localTable, $localId, array $attributes): void
    {
        $data = [
            'local_table' => $localTable,
            'local_id' => $localId,
            'type' => static::LOG_TYPE_DELETE,
            'modifier_id' => $this->getModifierId(),
            'old' => $attributes,
        ];

        $query = 'INSERT INTO ' . Utils::backtick($this->logTable) . ' SET ' . Utils::generateColumnsWithBinding(array_keys($data));
        $stmt = $this->connection->prepare($query);
        $stmt->execute($data);
    }

    abstract protected function getModifierId();
}