"""
OpenAPI Schema Creator Module

This module provides functionality to create and customize OpenAPI documentation:
- Custom security schemes (Bearer Auth, API Key)
- Response schemas and examples
- Tag management and descriptions
- Error responses and validation
- Custom documentation extensions
"""

from typing import Any, Dict, List, Optional, Set
from fastapi import FastAPI, APIRouter
from fastapi.openapi.utils import get_openapi
from AllConfigs.main import MainConfig as Config


class OpenAPISchemaCreator:
    """
    OpenAPI schema creator and customizer for FastAPI applications.
    """

    def __init__(self, app: FastAPI):
        """
        Initialize the OpenAPI schema creator.

        Args:
            app: FastAPI application instance
        """
        self.app = app
        self.protected_paths: Set[str] = set()
        self.tags_metadata = self._create_tags_metadata()

    @staticmethod
    def _create_tags_metadata() -> List[Dict[str, str]]:
        """
        Create metadata for API tags.

        Returns:
            List[Dict[str, str]]: List of tag metadata
        """
        return [
            {
                "name": "Authentication",
                "description": "Operations related to user authentication and authorization",
            },
            {
                "name": "Users",
                "description": "User management and profile operations",
            },
            # Add more tags as needed
        ]

    def _create_security_schemes(self) -> Dict[str, Any]:
        """
        Create security scheme definitions.

        Returns:
            Dict[str, Any]: Security scheme configurations
        """
        return {
            "Bearer Auth": {
                "type": "apiKey",
                "in": "header",
                "name": "evyos-session-key",
                "description": "Enter: **'Bearer <JWT>'**, where JWT is the access token",
            },
            "API Key": {
                "type": "apiKey",
                "in": "header",
                "name": "X-API-Key",
                "description": "API key for service authentication",
            },
        }

    def _create_common_responses(self) -> Dict[str, Any]:
        """
        Create common response schemas.

        Returns:
            Dict[str, Any]: Common response configurations
        """
        return {
            "401": {
                "description": "Unauthorized - Authentication failed or not provided",
                "content": {
                    "application/json": {
                        "schema": {
                            "type": "object",
                            "properties": {
                                "detail": {"type": "string"},
                                "error_code": {"type": "string"},
                            },
                        },
                        "example": {
                            "detail": "Invalid authentication credentials",
                            "error_code": "INVALID_CREDENTIALS",
                        },
                    }
                },
            },
            "403": {
                "description": "Forbidden - Insufficient permissions",
                "content": {
                    "application/json": {
                        "schema": {"$ref": "#/components/schemas/HTTPValidationError"}
                    }
                },
            },
            "422": {
                "description": "Validation Error",
                "content": {
                    "application/json": {
                        "schema": {"$ref": "#/components/schemas/HTTPValidationError"}
                    }
                },
            },
            "500": {
                "description": "Internal Server Error",
                "content": {
                    "application/json": {
                        "schema": {
                            "type": "object",
                            "properties": {
                                "detail": {"type": "string"},
                                "error_code": {"type": "string"},
                            },
                        },
                        "example": {
                            "detail": "Internal server error occurred",
                            "error_code": "INTERNAL_ERROR",
                        },
                    }
                },
            },
        }

    def configure_route_security(
        self, path: str, method: str, schema: Dict[str, Any]
    ) -> None:
        """
        Configure security requirements for a specific route.

        Args:
            path: Route path
            method: HTTP method
            schema: OpenAPI schema to modify
        """
        if path not in Config.INSECURE_PATHS:
            schema["paths"][path][method]["security"] = [
                {"Bearer Auth": []},
                {"API Key": []},
            ]
            schema["paths"][path][method]["responses"].update(
                self._create_common_responses()
            )

    def create_schema(self) -> Dict[str, Any]:
        """
        Create the complete OpenAPI schema.

        Returns:
            Dict[str, Any]: Complete OpenAPI schema
        """
        openapi_schema = get_openapi(
            title=Config.TITLE,
            description=Config.DESCRIPTION,
            version="1.0.0",
            routes=self.app.routes,
            tags=self.tags_metadata,
        )

        # Add security schemes
        if "components" not in openapi_schema:
            openapi_schema["components"] = {}
        
        openapi_schema["components"]["securitySchemes"] = self._create_security_schemes()

        # Configure route security and responses
        for route in self.app.routes:
            if isinstance(route, APIRoute) and route.include_in_schema:
                path = str(route.path)
                methods = [method.lower() for method in route.methods]
                
                for method in methods:
                    self.configure_route_security(path, method, openapi_schema)

        # Add custom documentation extensions
        openapi_schema["x-documentation"] = {
            "postman_collection": "/docs/postman",
            "swagger_ui": "/docs",
            "redoc": "/redoc",
        }

        return openapi_schema


def create_openapi_schema(app: FastAPI) -> Dict[str, Any]:
    """
    Create OpenAPI schema for a FastAPI application.

    Args:
        app: FastAPI application instance

    Returns:
        Dict[str, Any]: Complete OpenAPI schema
    """
    creator = OpenAPISchemaCreator(app)
    return creator.create_schema()