# Copyright (c) 2025 Patrick Motsch
# All rights reserved.
from typing import Any, Dict, List

from modules.datamodels.datamodelExtraction import ContentPart
from ..subUtils import makeId
from ..subRegistry import Extractor


class SqlExtractor(Extractor):
    """
    Extractor for SQL files.
    
    Supported formats:
    - MIME types: text/x-sql, application/sql
    - File extensions: .sql, .ddl, .dml, .dcl, .tcl
    - Special handling: Treats as structured text with SQL syntax
    """
    
    def detect(self, fileName: str, mimeType: str, headBytes: bytes) -> bool:
        return (mimeType in ("text/x-sql", "application/sql") or 
                (fileName or "").lower().endswith((".sql", ".ddl", ".dml", ".dcl", ".tcl")))
    
    def getSupportedExtensions(self) -> list[str]:
        """Return list of supported file extensions."""
        return [".sql", ".ddl", ".dml", ".dcl", ".tcl"]
    
    def getSupportedMimeTypes(self) -> list[str]:
        """Return list of supported MIME types."""
        return ["text/x-sql", "application/sql"]

    def extract(self, fileBytes: bytes, context: Dict[str, Any]) -> List[ContentPart]:
        fileName = context.get("fileName")
        mimeType = context.get("mimeType") or "text/x-sql"
        data = fileBytes.decode("utf-8", errors="replace")
        
        # Add SQL-specific metadata
        metadata = {
            "size": len(fileBytes),
            "file_type": "sql",
            "line_count": len(data.splitlines()),
            "has_select": "SELECT" in data.upper(),
            "has_insert": "INSERT" in data.upper(),
            "has_update": "UPDATE" in data.upper(),
            "has_delete": "DELETE" in data.upper(),
            "has_create": "CREATE" in data.upper(),
            "has_drop": "DROP" in data.upper()
        }
        
        return [ContentPart(
            id=makeId(),
            parentId=None,
            label="main",
            typeGroup="structure",
            mimeType=mimeType,
            data=data,
            metadata=metadata
        )]