# [DEF:MapperPluginModule:Module]
# @SEMANTICS: plugin, mapper, datasets, postgresql, excel
# @PURPOSE: Implements a plugin for mapping dataset columns using external database connections or Excel files.
# @LAYER: Plugins
# @RELATION: Inherits from PluginBase. Uses DatasetMapper from superset_tool.
# @CONSTRAINT: Must use belief_scope for logging.

# [SECTION: IMPORTS]
from typing import Dict, Any, Optional
from ..core.plugin_base import PluginBase
from ..core.superset_client import SupersetClient
from ..core.logger import logger, belief_scope
from ..core.database import SessionLocal
from ..models.connection import ConnectionConfig
from ..core.utils.dataset_mapper import DatasetMapper
# [/SECTION]

# [DEF:MapperPlugin:Class]
# @PURPOSE: Plugin for mapping dataset columns verbose names.
class MapperPlugin(PluginBase):
    """
    Plugin for mapping dataset columns verbose names.
    """

    @property
    # [DEF:id:Function]
    # @PURPOSE: Returns the unique identifier for the mapper plugin.
    # @PRE: Plugin instance exists.
    # @POST: Returns string ID.
    # @RETURN: str - "dataset-mapper"
    def id(self) -> str:
        with belief_scope("id"):
            return "dataset-mapper"
    # [/DEF:id:Function]

    @property
    # [DEF:name:Function]
    # @PURPOSE: Returns the human-readable name of the mapper plugin.
    # @PRE: Plugin instance exists.
    # @POST: Returns string name.
    # @RETURN: str - Plugin name.
    def name(self) -> str:
        with belief_scope("name"):
            return "Dataset Mapper"
    # [/DEF:name:Function]

    @property
    # [DEF:description:Function]
    # @PURPOSE: Returns a description of the mapper plugin.
    # @PRE: Plugin instance exists.
    # @POST: Returns string description.
    # @RETURN: str - Plugin description.
    def description(self) -> str:
        with belief_scope("description"):
            return "Map dataset column verbose names using PostgreSQL comments or Excel files."
    # [/DEF:description:Function]

    @property
    # [DEF:version:Function]
    # @PURPOSE: Returns the version of the mapper plugin.
    # @PRE: Plugin instance exists.
    # @POST: Returns string version.
    # @RETURN: str - "1.0.0"
    def version(self) -> str:
        with belief_scope("version"):
            return "1.0.0"
    # [/DEF:version:Function]

    # [DEF:get_schema:Function]
    # @PURPOSE: Returns the JSON schema for the mapper plugin parameters.
    # @PRE: Plugin instance exists.
    # @POST: Returns dictionary schema.
    # @RETURN: Dict[str, Any] - JSON schema.
    def get_schema(self) -> Dict[str, Any]:
        with belief_scope("get_schema"):
            return {
            "type": "object",
            "properties": {
                "env": {
                    "type": "string",
                    "title": "Environment",
                    "description": "The Superset environment (e.g., 'dev')."
                },
                "dataset_id": {
                    "type": "integer",
                    "title": "Dataset ID",
                    "description": "The ID of the dataset to update."
                },
                "source": {
                    "type": "string",
                    "title": "Mapping Source",
                    "enum": ["postgres", "excel"],
                    "default": "postgres"
                },
                "connection_id": {
                    "type": "string",
                    "title": "Saved Connection",
                    "description": "The ID of a saved database connection (for postgres source)."
                },
                "table_name": {
                    "type": "string",
                    "title": "Table Name",
                    "description": "Target table name in PostgreSQL."
                },
                "table_schema": {
                    "type": "string",
                    "title": "Table Schema",
                    "description": "Target table schema in PostgreSQL.",
                    "default": "public"
                },
                "excel_path": {
                    "type": "string",
                    "title": "Excel Path",
                    "description": "Path to the Excel file (for excel source)."
                }
            },
            "required": ["env", "dataset_id", "source"]
        }
    # [/DEF:get_schema:Function]

    # [DEF:execute:Function]
    # @PURPOSE: Executes the dataset mapping logic.
    # @PARAM: params (Dict[str, Any]) - Mapping parameters.
    # @PRE: Params contain valid 'env', 'dataset_id', and 'source'. params must be a dictionary.
    # @POST: Updates the dataset in Superset.
    # @RETURN: Dict[str, Any] - Execution status.
    async def execute(self, params: Dict[str, Any]) -> Dict[str, Any]:
        with belief_scope("execute"):
            env_name = params.get("env")
            dataset_id = params.get("dataset_id")
            source = params.get("source")
            
            if not env_name or dataset_id is None or not source:
                logger.error("[MapperPlugin.execute][State] Missing required parameters.")
                raise ValueError("Missing required parameters: env, dataset_id, source")

            # Get config and initialize client
            from ..dependencies import get_config_manager
            config_manager = get_config_manager()
            env_config = config_manager.get_environment(env_name)
            if not env_config:
                logger.error(f"[MapperPlugin.execute][State] Environment '{env_name}' not found.")
                raise ValueError(f"Environment '{env_name}' not found in configuration.")

            client = SupersetClient(env_config)
            client.authenticate()

            postgres_config = None
            if source == "postgres":
                connection_id = params.get("connection_id")
                if not connection_id:
                    logger.error("[MapperPlugin.execute][State] connection_id is required for postgres source.")
                    raise ValueError("connection_id is required for postgres source.")
                
                # Load connection from DB
                db = SessionLocal()
                try:
                    conn_config = db.query(ConnectionConfig).filter(ConnectionConfig.id == connection_id).first()
                    if not conn_config:
                        logger.error(f"[MapperPlugin.execute][State] Connection {connection_id} not found.")
                        raise ValueError(f"Connection {connection_id} not found.")
                    
                    postgres_config = {
                        'dbname': conn_config.database,
                        'user': conn_config.username,
                        'password': conn_config.password,
                        'host': conn_config.host,
                        'port': str(conn_config.port) if conn_config.port else '5432'
                    }
                finally:
                    db.close()

            logger.info(f"[MapperPlugin.execute][Action] Starting mapping for dataset {dataset_id} in {env_name}")
            
            mapper = DatasetMapper()
            
            try:
                mapper.run_mapping(
                    superset_client=client,
                    dataset_id=dataset_id,
                    source=source,
                    postgres_config=postgres_config,
                    excel_path=params.get("excel_path"),
                    table_name=params.get("table_name"),
                    table_schema=params.get("table_schema") or "public"
                )
                logger.info(f"[MapperPlugin.execute][Success] Mapping completed for dataset {dataset_id}")
                return {"status": "success", "dataset_id": dataset_id}
            except Exception as e:
                logger.error(f"[MapperPlugin.execute][Failure] Mapping failed: {e}")
                raise
    # [/DEF:execute:Function]

# [/DEF:MapperPlugin:Class]
# [/DEF:MapperPluginModule:Module]