from .ssh import SSHClient

class DatabaseManager:
    def __init__(self, config):
        # Database server details
        self.host = config.get('database.host', '10.32.70.54')
        self.user = config.get('database.user', 'root')
        self.ssh_key = config.get('proxmox.ssh_key_path')
        self.client = SSHClient(self.host, self.user, self.ssh_key)

    def exec_sql(self, sql):
        # Runs SQL as postgres user via SSH
        res = self.client.run(f"su - postgres -c \"psql -c \\"{sql}\"\"")
        if res.returncode != 0:
            raise RuntimeError(f"PostgreSQL command failed: {res.stderr}")
        return res.stdout

    def create_database(self, db_name, owner=None):
        sql = f"CREATE DATABASE {db_name}"
        if owner:
            sql += f" OWNER {owner}"
        return self.exec_sql(sql)

    def create_user(self, username, password):
        sql = f"CREATE USER {username} WITH PASSWORD '{password}'"
        return self.exec_sql(sql)

    def grant_privileges(self, db_name, username):
        sql = f"GRANT ALL PRIVILEGES ON DATABASE {db_name} TO {username}"
        return self.exec_sql(sql)

    def list_databases(self):
        return self.exec_sql("\l")

    def list_users(self):
        return self.exec_sql("\du")

    def drop_database(self, db_name):
        return self.exec_sql(f"DROP DATABASE IF EXISTS {db_name}")

    def drop_user(self, username):
        return self.exec_sql(f"DROP USER IF EXISTS {username}")