<?php

namespace Bcs\Databaseinterface;

class SqlSrvClient implements DatabaseInterface
{
    protected $connection;

    public function __construct(string $serverName, string $database, string $username, string $password)
    {
        $connectionOptions = [
            "Database" => $database,
            "Uid" => $username,
            "PWD" => $password,
            "TrustServerCertificate" => "true",
        ];
        $this->connection = sqlsrv_connect($serverName, $connectionOptions);

        // Check if the connection is successful
        if ($this->connection === false) {
            throw new \Exception("Failed to connect to the database: " . print_r(sqlsrv_errors(), true));
        }
    }

    private function fetchResults($stmt): array
    {
        $rows = [];
        while ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
            $rows[] = $row;
        }
        return $rows;
    }

    public function query(string $sql, array $parameters = []): array
    {
        $stmt = sqlsrv_prepare($this->connection, $sql, $parameters);

        if (!sqlsrv_execute($stmt)) {
            throw new \Exception("Query failed: " . print_r(sqlsrv_errors(), true));
        }

        $rows = $this->fetchResults($stmt);
        sqlsrv_free_stmt($stmt); // Freeing the statement is important to prevent resource leaks.

        return $rows;
    }

    public function executeProcedure(string $procedureName, array $parameters = []): bool
    {
        $sql = "EXEC $procedureName " . implode(', ', array_map(fn($p) => '?', $parameters));
        $stmt = sqlsrv_prepare($this->connection, $sql, array_values($parameters));

        return sqlsrv_execute($stmt);
    }

    public function beginTransaction(): void
    {
        sqlsrv_begin_transaction($this->connection);
    }

    public function commit(): void
    {
        sqlsrv_commit($this->connection);
    }

    public function rollBack(): void
    {
        sqlsrv_rollback($this->connection);
    }

    public function execute(string $sql, array $parameters): bool
    {
        $stmt = sqlsrv_prepare($this->connection, $sql, $parameters);

        return sqlsrv_execute($stmt);
    }

    public function insert(string $table, array $data): bool
    {
        $columns = implode(', ', array_keys($data));
        $values = implode(', ', array_map(fn($v) => '?', $data));
        $sql = "INSERT INTO $table ($columns) VALUES ($values)";

        $stmt = sqlsrv_prepare($this->connection, $sql, array_values($data));

        return sqlsrv_execute($stmt);
    }
}