#!.venv/bin/python
"""Utility functions for OpenAPI specification conversion tasks."""

import argparse
import json
import sys

if __package__ is None or __package__ == "":
    # uses current directory visibility
    import generate_openapi
else:
    # uses current package visibility
    from . import generate_openapi


def extract_info(openapi_json: dict) -> dict:
    """Extract basic information from OpenAPI JSON.

    Args:
        openapi_json (dict): The OpenAPI specification as a Python dictionary.

    Returns:
        dict: A dictionary containing the title, version, description, and base_url.
    """
    info = openapi_json.get("info", {})
    servers = openapi_json.get("servers", [{}])

    return {
        "title": info.get("title", "API Documentation"),
        "version": info.get("version", "1.0.0"),
        "description": info.get("description", "No description provided."),
        "base_url": servers[0].get("url", "No base URL provided."),
    }


def format_authentication(security_schemes: dict) -> str:
    """Format the authentication section for the Markdown.

    Args:
        security_schemes (dict): The security schemes from the OpenAPI spec.

    Returns:
        str: The formatted authentication section in Markdown.
    """
    if not security_schemes:
        return ""

    markdown = "## Authentication\n\n"
    for scheme, details in security_schemes.items():
        auth_type = details.get("type", "unknown")
        markdown += f"- **{scheme}**: {auth_type}\n\n"
    return markdown


def format_parameters(parameters: list) -> str:
    """Format the parameters section for the Markdown.

    Args:
        parameters (list): The list of parameters from an endpoint.

    Returns:
        str: The formatted parameters section in Markdown.
    """
    if not parameters:
        return ""

    markdown = "**Parameters**:\n\n"
    for param in parameters:
        name = param.get("name", "unknown")
        location = param.get("in", "unknown")
        required = param.get("required", False)
        description = param.get("description", "No description provided.")
        markdown += (
            f"- `{name}` ({location}, {'required' if required else 'optional'}): {description}\n\n"
        )
    return markdown


def format_request_body(request_body: dict) -> str:
    """Format the request body section for the Markdown.

    Args:
        request_body (dict): The request body content from an endpoint.

    Returns:
        str: The formatted request body section in Markdown.
    """
    if not request_body:
        return ""

    markdown = "**Request Body**:\n\n"
    for content_type, schema in request_body.items():
        markdown += f"- `{content_type}`: {json.dumps(schema.get('schema', {}), indent=2)}\n\n"
    return markdown


def format_responses(responses: dict) -> str:
    """Format the responses section for the Markdown.

    Args:
        responses (dict): The responses from an endpoint.

    Returns:
        str: The formatted responses section in Markdown.
    """
    if not responses:
        return ""

    markdown = "**Responses**:\n\n"
    for status, response in responses.items():
        desc = response.get("description", "No description provided.")
        markdown += f"- **{status}**: {desc}\n\n"
    return markdown


def format_endpoint(path: str, method: str, details: dict) -> str:
    """Format a single endpoint's details for the Markdown.

    Args:
        path (str): The endpoint path.
        method (str): The HTTP method.
        details (dict): The details of the endpoint.

    Returns:
        str: The formatted endpoint section in Markdown.
    """
    link_summary = (
        details.get("summary", "<summary missing>")
        .lower()
        .strip()
        .replace(" ", "_")
        .replace("-", "_")
    )
    link_path = (
        path.lower().strip().replace("/", "_").replace(".", "_").replace("{", "_").replace("}", "_")
    )
    link_method = f"_{method.lower()})"
    # [local](http://localhost:8503/docs#/default/fastapi_config_get_v1_config_get)
    local_path = (
        "[local](http://localhost:8503/docs#/default/" + link_summary + link_path + link_method
    )
    # [swagger](https://petstore3.swagger.io/?url=https://raw.githubusercontent.com/Akkudoktor-EOS/EOS/refs/heads/main/openapi.json#/default/fastapi_strompreis_strompreis_get)
    swagger_path = (
        "[swagger](https://petstore3.swagger.io/?url=https://raw.githubusercontent.com/Akkudoktor-EOS/EOS/refs/heads/main/openapi.json#/default/"
        + link_summary
        + link_path
        + link_method
    )

    markdown = f"## {method.upper()} {path}\n\n"

    markdown += f"**Links**: {local_path}, {swagger_path}\n\n"

    summary = details.get("summary", None)
    if summary:
        markdown += f"{summary}\n\n"

    description = details.get("description", None)
    if description:
        markdown += "```\n"
        markdown += f"{description}"
        markdown += "\n```\n\n"

    markdown += format_parameters(details.get("parameters", []))
    markdown += format_request_body(details.get("requestBody", {}).get("content", {}))
    markdown += format_responses(details.get("responses", {}))
    markdown += "---\n\n"

    return markdown


def openapi_to_markdown(openapi_json: dict) -> str:
    """Convert OpenAPI JSON specification to a Markdown representation.

    Args:
        openapi_json (dict): The OpenAPI specification as a Python dictionary.

    Returns:
        str: The Markdown representation of the OpenAPI spec.
    """
    info = extract_info(openapi_json)
    markdown = f"# {info['title']}\n\n"
    markdown += f"**Version**: `{info['version']}`\n\n"
    markdown += f"**Description**: {info['description']}\n\n"
    markdown += f"**Base URL**: `{info['base_url']}`\n\n"

    security_schemes = openapi_json.get("components", {}).get("securitySchemes", {})
    markdown += format_authentication(security_schemes)

    markdown += "**Endpoints**:\n\n"
    paths = openapi_json.get("paths", {})
    for path, methods in paths.items():
        for method, details in methods.items():
            markdown += format_endpoint(path, method, details)

    # Assure the is no double \n at end of file
    markdown = markdown.rstrip("\n")
    markdown += "\n"

    return markdown


def generate_openapi_md() -> str:
    """Generate OpenAPI specification in Markdown.

    Returns:
        str: The Markdown representation of the OpenAPI spec.
    """
    openapi_spec = generate_openapi.generate_openapi()
    openapi_md = openapi_to_markdown(openapi_spec)
    return openapi_md


def main():
    """Main function to run the generation of the OpenAPI specification as Markdown."""
    parser = argparse.ArgumentParser(description="Generate OpenAPI Specification as Markdown")
    parser.add_argument(
        "--output-file", type=str, default=None, help="File to write the OpenAPI Specification to"
    )

    args = parser.parse_args()

    try:
        openapi_md = generate_openapi_md()
        if args.output_file:
            # Write to file
            with open(args.output_file, "w") as f:
                f.write(openapi_md)
        else:
            # Write to std output
            print(openapi_md)

    except Exception as e:
        print(f"Error during OpenAPI specification generation: {e}", file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()