"""
# Copyright (c) 2025  PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""

from typing import Any, Dict, List, Optional

from ..base import StorageConnector, StorageScheduler


class MooncakeStorageScheduler(StorageScheduler):
    """
    Mooncake storage scheduler for Scheduler process.

    Provides query operations for Mooncake distributed storage.
    """

    def __init__(self, config: Optional[Dict[str, Any]] = None):
        """
        Initialize Mooncake storage scheduler.

        Args:
            config: Configuration with keys:
                - server_addr: Mooncake server address
                - namespace: Storage namespace
                - timeout: Connection timeout
        """
        super().__init__(config)
        self._client = None

    def connect(self) -> bool:
        """Connect to Mooncake storage."""
        try:
            # Initialize Mooncake client
            # This would be implemented with actual Mooncake SDK
            # import mooncake
            # self._client = mooncake.Client(**self.config)
            self._connected = True
            return True
        except Exception:
            self._connected = False
            return False

    def disconnect(self) -> None:
        """Disconnect from Mooncake storage."""
        self._client = None
        self._connected = False

    def exists(self, key: str) -> bool:
        """Check if key exists in Mooncake storage."""
        if not self._connected or self._client is None:
            return False

        # Placeholder implementation
        # return self._client.exists(key)
        return False

    def query(self, keys: List[str]) -> Dict[str, bool]:
        """Query multiple keys for existence."""
        if not self._connected or self._client is None:
            return {k: False for k in keys}

        # Placeholder implementation
        # return self._client.batch_exists(keys)
        return {k: False for k in keys}

    def get_metadata(self, key: str) -> Optional[Dict[str, Any]]:
        """Get metadata for a key."""
        if not self._connected or self._client is None:
            return None

        # Placeholder implementation
        # return self._client.get_metadata(key)
        return None

    def list_keys(self, prefix: str = "") -> List[str]:
        """List keys with a given prefix."""
        if not self._connected or self._client is None:
            return []

        # Placeholder implementation
        # return self._client.list_keys(prefix)
        return []


class MooncakeStorageConnector(StorageConnector):
    """
    Mooncake storage connector for Worker process.

    Provides data transfer operations for Mooncake distributed storage.
    """

    def __init__(self, config: Optional[Dict[str, Any]] = None):
        """
        Initialize Mooncake storage connector.

        Args:
            config: Configuration with keys:
                - server_addr: Mooncake server address
                - namespace: Storage namespace
                - transfer_timeout: Transfer timeout
                - buffer_size: Transfer buffer size
        """
        super().__init__(config)
        self._client = None

    def connect(self) -> bool:
        """Connect to Mooncake storage."""
        try:
            # Initialize Mooncake client
            # This would be implemented with actual Mooncake SDK
            self._connected = True
            return True
        except Exception:
            self._connected = False
            return False

    def disconnect(self) -> None:
        """Disconnect from Mooncake storage."""
        self._client = None
        self._connected = False

    def get(self, key: str, dst_buffer: Any) -> bool:
        """Get data from Mooncake storage."""
        if not self._connected or self._client is None:
            return False

        # Placeholder implementation
        # return self._client.get(key, dst_buffer)
        return False

    def set(self, key: str, src_buffer: Any, size: int) -> bool:
        """Set data in Mooncake storage."""
        if not self._connected or self._client is None:
            return False

        # Placeholder implementation
        # return self._client.set(key, src_buffer, size)
        return False

    def delete(self, key: str) -> bool:
        """Delete data from Mooncake storage."""
        if not self._connected or self._client is None:
            return False

        # Placeholder implementation
        # return self._client.delete(key)
        return False

    def clear(self, prefix: str = "") -> int:
        """Clear data from Mooncake storage."""
        if not self._connected or self._client is None:
            return 0

        # Placeholder implementation
        # return self._client.clear(prefix)
        return 0