from .ssh import SSHClient
import tempfile
import os

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):
        # Use a temporary file to avoid shell quoting hell
        with tempfile.NamedTemporaryFile(mode='w', suffix='.sql', delete=False) as tf:
            tf.write(sql)
            tf_name = tf.name
        
        try:
            remote_path = f"/tmp/exec_{os.path.basename(tf_name)}"
            self.client.scp_to(tf_name, remote_path)
            
            # Ensure the postgres user can read the file
            self.client.run(f"chmod 644 {remote_path}")
            
            # Execute the SQL file as postgres user
            cmd = f"su - postgres -c 'psql -f {remote_path}'"
            res = self.client.run(cmd)
            
            # Cleanup remote file
            self.client.run(f"rm {remote_path}")
            
            if res.returncode != 0:
                raise RuntimeError(f"PostgreSQL command failed: {res.stderr}")
            return res.stdout
        finally:
            if os.path.exists(tf_name):
                os.remove(tf_name)

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

    def create_user(self, username, password):
        # SQL with proper quoting for the 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};")