import importlib
import json
import asyncio
import logging
import os
import re
import sys
from temporalio import activity
from temporalio.exceptions import ApplicationError
from jsonschema import validate, ValidationError
from temporalio.client import Client
from temporalio.worker import Worker

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(name)s - %(message)s",
)
logger = logging.getLogger(__name__)

# Automatically determine if in a test environment
IS_TEST_ENVIRONMENT = "unittest" in sys.modules

# Retrieve environment variables
REPO_NAME = os.getenv('REPO_NAME')
BRANCH_NAME = os.getenv('BRANCH_NAME')
COMMIT_ID = os.getenv('VERSION')
NAMESPACE = os.getenv('NAMESPACE')
FLOWX_ENGINE_ADDRESS = os.getenv('FLOWX_ENGINE_ADDRESS')

if not BRANCH_NAME or not COMMIT_ID or not BRANCH_NAME or not NAMESPACE or not FLOWX_ENGINE_ADDRESS:
    raise ValueError("Environment variables BRANCH_NAME, VERSION, BRANCH_NAME, NAMESPACE and FLOWX_ENGINE_ADDRESS must be set.")


# Shorten the commit ID to the first 10 characters
COMMIT_ID_SHORT = COMMIT_ID[:10]

# Sanitize flow name and commit ID to create a valid task queue name
def sanitize_name(name):
    # Replace non-alphanumeric characters or invalid start with underscores
    sanitized = re.sub(r'\W|^(?=\d)', '_', name)
    # Replace multiple consecutive underscores with a single underscore
    sanitized = re.sub(r'_+', '_', sanitized)
    # Remove trailing underscores
    return sanitized.strip('_')

BLOCK_NAME = REPO_NAME + "_" + BRANCH_NAME
block_name_safe = sanitize_name(BLOCK_NAME)
commit_id_safe = sanitize_name(COMMIT_ID_SHORT)

# Construct the task queue name
TASK_QUEUE = f"{block_name_safe}_{commit_id_safe}"

# Load schemas for input validation and output validation
def load_schema(schema_path):
    try:
        with open(schema_path, 'r') as schema_file:
            return json.load(schema_file)
    except Exception as e:
        logger.error("Failed to load schema from %s: %s", schema_path, e)
        if not IS_TEST_ENVIRONMENT:
            raise ApplicationError(f"Schema loading failed: {e}")
        else:
            raise ValueError(f"Schema loading failed: {e}")

# Load block.py dynamically and get the main function
def load_block_main():
    try:
        block_module = importlib.import_module("block")
        if not hasattr(block_module, "__main__"):
            raise AttributeError("The module block.py does not have a __main__ function")
        logger.info("Successfully loaded __main__ function from block.py")
        return block_module.__main__
    except ImportError as e:
        logger.error("Failed to import block.py: %s", e)
        if not IS_TEST_ENVIRONMENT:
            raise ApplicationError(f"block.py import failed: {e}")
        else:
            raise ValueError(f"block.py import failed: {e}")
    except AttributeError as e:
        logger.error("block.py does not contain a __main__ function: %s", e)
        if not IS_TEST_ENVIRONMENT:
            raise ApplicationError(f"__main__ function not found in block.py: {e}")
        else:
            raise ValueError(f"__main__ function not found in block.py: {e}")

# Validate input data against request schema
def validate_input(input_data):
    request_schema = load_schema("/app/request_schema.json")
    try:
        validate(instance=input_data, schema=request_schema)
        logger.info("Input data validated successfully")
    except ValidationError as e:
        logger.error("Input validation failed: %s", e)
        if not IS_TEST_ENVIRONMENT:
            raise ApplicationError(f"Input validation error: {e}")
        else:
            raise ValueError(f"Input validation error: {e}")

# Validate output data against response schema
def validate_output(output_data):
    response_schema = load_schema("/app/response_schema.json")
    try:
        validate(instance=output_data, schema=response_schema)
        logger.info("Output data validated successfully")
    except ValidationError as e:
        logger.error("Output validation failed: %s", e)
        if not IS_TEST_ENVIRONMENT:
            raise ApplicationError(f"Output validation error: {e}")
        else:
            raise ValueError(f"Output validation error: {e}")

# Registering activity
@activity.defn
async def block_main_activity(input_data):
    """
    Wraps the main function from block.py as an activity.
    Validates input data against request schema and output data against response schema.
    """
    # Validate the input
    validate_input(input_data)

    # Load the main function and call it with validated input
    main_func = load_block_main()
    try:
        # Pass input data as keyword arguments to the main function
        result = main_func(**input_data)
        logger.info("block.py executed successfully with result: %s", result)

        # Validate output against response schema
        validate_output(result)
        return result
    except Exception as e:
        logger.error("Error executing block.py: %s", e)
        if not IS_TEST_ENVIRONMENT:
            raise ApplicationError(f"Error during block execution: {e}") from e
        else:
            raise RuntimeError("Error during block.py execution") from e

# Worker function
async def main():
    """
    Initialize and run the worker with the activity.
    """
    try:
        client = await Client.connect(FLOWX_ENGINE_ADDRESS, namespace=NAMESPACE)
        worker = Worker(
            client,
            task_queue=TASK_QUEUE,
            activities=[block_main_activity],
        )
        logger.info("Worker starting, listening to task queue: %s", TASK_QUEUE)
        await worker.run()
    except Exception as e:
        logger.critical("Worker failed to start: %s", e)
        raise

# Main function to initialize worker
if __name__ == "__main__":
    # Run the worker
    asyncio.run(main())