import argparse
import json
import logging
import os

import boto3
from botocore.exceptions import ClientError

logger = logging.getLogger(__name__)

parser = argparse.ArgumentParser()
parser.add_argument("--region")
args, _ = parser.parse_known_args()
sm_client = boto3.client("sagemaker", region_name = args.region)

 
def get_approved_package(model_package_group_name):
    """Gets the latest approved model package for a model package group.

    Args:
        model_package_group_name: The model package group name.

    Returns:
        The SageMaker Model Package ARN.
    """
    try:
        # Get the latest approved model package
        response = sm_client.list_model_packages(
            ModelPackageGroupName=model_package_group_name,
            ModelApprovalStatus="Approved",
            SortBy="CreationTime",
            MaxResults=100,
        )
        approved_packages = response["ModelPackageSummaryList"]

        # Fetch more packages if none returned with continuation token
        while len(approved_packages) == 0 and "NextToken" in response:
            logger.debug("Getting more packages for token: {}".format(response["NextToken"]))
            response = sm_client.list_model_packages(
                ModelPackageGroupName=model_package_group_name,
                ModelApprovalStatus="Approved",
                SortBy="CreationTime",
                MaxResults=100,
                NextToken=response["NextToken"],
            )
            approved_packages.extend(response["ModelPackageSummaryList"])

        # Return error if no packages found
        if len(approved_packages) == 0:
            error_message = (
                f"No approved ModelPackage found for ModelPackageGroup: {model_package_group_name}"
            )
            logger.error(error_message)
            raise Exception(error_message)

        # Return the pmodel package arn
        model_package_arn = approved_packages[0]["ModelPackageArn"]
        logger.info(f"Identified the latest approved model package: {model_package_arn}")
        return model_package_arn
    except ClientError as e:
        error_message = e.response["Error"]["Message"]
        logger.error(error_message)
        raise Exception(error_message)


def extend_config(args, model_package_arn, stage_config):
    """
    Extend the stage configuration with additional parameters and tags based.
    """
    # Verify that config has parameters and tags sections
    if not "Parameters" in stage_config or not "StageName" in stage_config["Parameters"]:
        raise Exception("Configuration file must include SageName parameter")
    if not "Tags" in stage_config:
        stage_config["Tags"] = {}
    # Create new params and tags
    new_params = {
        "SageMakerProjectName": args.sagemaker_project_name,
        "ModelPackageName": model_package_arn,
        "ModelExecutionRoleArn": args.model_execution_role,
    }
    new_tags = {
        "sagemaker:deployment-stage": stage_config["Parameters"]["StageName"],
        "sagemaker:project-id": args.sagemaker_project_id,
        "sagemaker:project-name": args.sagemaker_project_name,
    }
    # Add tags from Project
    get_pipeline_custom_tags(args, sm_client, new_tags)

    return {
        "Parameters": {**stage_config["Parameters"], **new_params},
        "Tags": {**stage_config.get("Tags", {}), **new_tags},
    }

def get_pipeline_custom_tags(args, sm_client, new_tags):
    try:
        response = sm_client.list_tags(
                ResourceArn=args.sagemaker_project_arn)
        project_tags = response["Tags"]
        for project_tag in project_tags:
            new_tags[project_tag["Key"]] = project_tag["Value"]
    except:
        logger.error("Error getting project tags")
    return new_tags

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--log-level", type=str, default=os.environ.get("LOGLEVEL", "INFO").upper())
    parser.add_argument("--model-execution-role", type=str, required=True)
    parser.add_argument("--model-package-group-name", type=str, required=True)
    parser.add_argument("--sagemaker-project-id", type=str, required=True)
    parser.add_argument("--sagemaker-project-name", type=str, required=True)
    parser.add_argument("--sagemaker-project-arn", type=str, required=False)
    parser.add_argument("--import-staging-config", type=str, default="staging-config.json")
    parser.add_argument("--import-prod-config", type=str, default="prod-config.json")
    parser.add_argument("--export-staging-config", type=str, default="staging-config-export.json")
    parser.add_argument("--export-staging-params", type=str, default="staging-params-export.json")
    parser.add_argument("--export-staging-tags", type=str, default="staging-tags-export.json")
    parser.add_argument("--export-prod-config", type=str, default="prod-config-export.json")
    parser.add_argument("--export-prod-params", type=str, default="prod-params-export.json")
    parser.add_argument("--export-prod-tags", type=str, default="prod-tags-export.json")
    args, _ = parser.parse_known_args()

    # Configure logging to output the line number and message
    log_format = "%(levelname)s: [%(filename)s:%(lineno)s] %(message)s"
    logging.basicConfig(format=log_format, level=args.log_level)

    # Get the latest approved package
    model_package_arn = get_approved_package(args.model_package_group_name)

    # Write the staging config
    with open(args.import_staging_config, "r") as f:
        staging_config = extend_config(args, model_package_arn, json.load(f))
    logger.debug("Staging config: {}".format(json.dumps(staging_config, indent=4)))
    with open(args.export_staging_config, "w") as f:
        json.dump(staging_config, f, indent=4)

    # Write the prod config for code pipeline
    with open(args.import_prod_config, "r") as f:
        prod_config = extend_config(args, model_package_arn, json.load(f))
    logger.debug("Prod config: {}".format(json.dumps(prod_config, indent=4)))
    with open(args.export_prod_config, "w") as f:
        json.dump(prod_config, f, indent=4)