#!/usr/bin/env python3
"""Parse structured data from PDF forms and tables.

This script demonstrates advanced PDF processing capabilities.
"""
import sys
import json
import os


def parse_pdf(file_path: str, extract_tables: bool, extract_forms: bool):
    """
    Parse structured data from PDF (mock implementation).

    In a real implementation, this would use libraries like:
    - tabula-py or camelot for table extraction
    - PyPDF2 or pdfplumber for form field extraction

    Args:
        file_path: Path to the PDF file
        extract_tables: Whether to extract tables
        extract_forms: Whether to extract form fields

    Returns:
        dict with parsed data
    """
    result = {
        "file_path": file_path,
        "extracted_data": {}
    }

    if extract_tables:
        result["extracted_data"]["tables"] = [
            {
                "page": 1,
                "rows": 5,
                "columns": 3,
                "data": [
                    ["Header1", "Header2", "Header3"],
                    ["Row1Col1", "Row1Col2", "Row1Col3"],
                    ["Row2Col1", "Row2Col2", "Row2Col3"]
                ]
            }
        ]

    if extract_forms:
        result["extracted_data"]["forms"] = {
            "name": "John Doe",
            "email": "john@example.com",
            "checkbox_agree": True
        }

    return result


def main():
    """Main entry point for PDF parsing script."""
    try:
        # Read JSON arguments from stdin
        args = json.load(sys.stdin)

        # Validate and extract arguments
        file_path = args.get("file_path")
        if not file_path:
            raise ValueError("Missing required argument: file_path")

        extract_tables = args.get("extract_tables", False)
        extract_forms = args.get("extract_forms", False)

        # Perform parsing
        result = parse_pdf(file_path, extract_tables, extract_forms)

        # Output result as JSON
        print(json.dumps(result, indent=2))
        sys.exit(0)

    except json.JSONDecodeError as e:
        error = {"error": "Invalid JSON input", "details": str(e)}
        print(json.dumps(error), file=sys.stderr)
        sys.exit(1)

    except ValueError as e:
        error = {"error": "Invalid arguments", "details": str(e)}
        print(json.dumps(error), file=sys.stderr)
        sys.exit(1)

    except Exception as e:
        error = {"error": "Unexpected error", "details": str(e)}
        print(json.dumps(error), file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()