<?php
class DepartmentManager
{
    private PDO $pdo;
    private int $companyId;

    public function __construct(PDO $pdo, int $company_id)
    {
        $this->pdo       = $pdo;
        $this->companyId = $company_id;
    }

    public function getAll(): array
    {
        $sth = $this->pdo->prepare(
            "SELECT * FROM ac_department
             WHERE company_id = :cid
             ORDER BY dept_code ASC"
        );
        $sth->execute([':cid' => $this->companyId]);
        return $sth->fetchAll(PDO::FETCH_ASSOC);
    }

    public function getById(int $id): ?array
    {
        $sth = $this->pdo->prepare(
            "SELECT * FROM ac_department
             WHERE company_id = :cid AND id = :id LIMIT 1"
        );
        $sth->execute([':cid' => $this->companyId, ':id' => $id]);
        $row = $sth->fetch(PDO::FETCH_ASSOC);
        return $row ?: null;
    }

    public function create(array $data): int
    {
        $sth = $this->pdo->prepare(
            "INSERT INTO ac_department (company_id, dept_code, dept_name, description, status)
             VALUES (:cid, :code, :name, :desc, :status)"
        );
        $sth->execute([
            ':cid'    => $this->companyId,
            ':code'   => trim($data['dept_code']),
            ':name'   => trim($data['dept_name']),
            ':desc'   => $data['description'] ?? null,
            ':status' => (int)($data['status'] ?? 1),
        ]);
        return (int)$this->pdo->lastInsertId();
    }

    public function update(int $id, array $data): void
    {
        $sth = $this->pdo->prepare(
            "UPDATE ac_department SET
               dept_code   = :code,
               dept_name   = :name,
               description = :desc,
               status      = :status
             WHERE company_id = :cid AND id = :id"
        );
        $sth->execute([
            ':cid'    => $this->companyId,
            ':id'     => $id,
            ':code'   => trim($data['dept_code']),
            ':name'   => trim($data['dept_name']),
            ':desc'   => $data['description'] ?? null,
            ':status' => (int)($data['status'] ?? 1),
        ]);
    }

    public function delete(int $id): void
    {
        $sth = $this->pdo->prepare(
            "UPDATE ac_department SET status = 0
             WHERE company_id = :cid AND id = :id"
        );
        $sth->execute([':cid' => $this->companyId, ':id' => $id]);
    }

    public function getStats(): array
    {
        $sth = $this->pdo->prepare(
            "SELECT COUNT(*) AS total,
                    SUM(status = 1) AS active,
                    SUM(status = 0) AS inactive
             FROM ac_department WHERE company_id = :cid"
        );
        $sth->execute([':cid' => $this->companyId]);
        return $sth->fetch(PDO::FETCH_ASSOC) ?: [];
    }
}