import json
import logging
import os

import boto3
from aws_lambda_powertools import Tracer

from common.response import ok
from libs.utils import response_error

tracer = Tracer()
logger = logging.getLogger(__name__)
logger.setLevel(os.environ.get('LOG_LEVEL') or logging.ERROR)

msg_table_name = os.environ.get("MSG_TABLE")
ddb = boto3.client('dynamodb')


def save_message_to_dynamodb(prompt_id, message):
    try:
        response = ddb.get_item(
            TableName=msg_table_name,
            Key={
                'prompt_id': {'S': prompt_id}
            }
        )
        existing_item = response.get('Item')
        if existing_item:
            existing_messages = json.loads(existing_item['message_body']['S'])
            existing_messages.append(message)
            ddb.update_item(
                TableName=msg_table_name,
                Key={
                    'prompt_id': {'S': prompt_id}
                },
                UpdateExpression='SET message_body = :new_messages',
                ExpressionAttributeValues={
                    ':new_messages': {'S': json.dumps(existing_messages)}
                }
            )
            logger.info(f"Message appended to existing record for prompt_id: {prompt_id}")
        else:
            ddb.put_item(
                TableName=msg_table_name,
                Item={
                    'prompt_id': {'S': prompt_id},
                    'message_body': {'S': json.dumps([message])}
                }
            )
            logger.info(f"New record created for prompt_id: {prompt_id}")
    except Exception as e:
        logger.error(f"Error saving message to DynamoDB: {e}")


@tracer.capture_lambda_handler
def handler(raw_event, ctx):
    logger.info(f"sync msg start... Received event: {raw_event}")
    try:
        if 'Records' not in raw_event or not raw_event['Records']:
            logger.error("ignore empty records msg")
            return ok()
        msg_save = {}
        for message in raw_event['Records']:
            if not message or 'body' not in message:
                logger.error("ignore empty body msg")
                return ok()
            msg = json.loads(message['body'])
            logger.info(f"msg body: {msg}")
            if 'prompt_id' in msg and msg['prompt_id']:
                if msg['prompt_id'] in msg_save.keys():
                    msg_save[msg['prompt_id']].append(msg)
                else:
                    msg_save[msg['prompt_id']] = []
                    msg_save[msg['prompt_id']].append(msg)
        for item in msg_save.keys():
            save_message_to_dynamodb(item, msg_save[item])
        logger.info("execute end...")
        return ok()
    except Exception as e:
        return response_error(e)