import boto3
import json
import botocore.exceptions
from datetime import datetime, timedelta, timezone
import uuid
import es



def history(event, context):
    s3 = boto3.resource('s3')
    serial = str(event["pathParameters"]["serial"])

    # if there's a historic file created for this sonde, use that instead
    try:
        object = s3.Object('sondehub-history', f'serial/{serial}.json.gz')
        
        object.load()
        lastModified = object.meta.data['LastModified']
        if not lastModified + timedelta(hours=12) > datetime.now(timezone.utc):
            return {"statusCode": 302, "headers": {"Location": f'https://{object.bucket_name}.s3.amazonaws.com/{object.key}'}}
    except botocore.exceptions.ClientError as e:
        if e.response['Error']['Code'] == "404":
            pass
        else:
            # Something else has gone wrong.
            raise
    path = "telm-*/_search"
    payload = {
        "aggs": {
            "3": {
                "date_histogram": {
                    "field": "datetime",
                    "fixed_interval": "1s",
                    "min_doc_count": 1,
                },
                "aggs": {
                    "1": {
                        "top_hits": {
                            "size": 1,
                            "sort": [{"datetime": {"order": "desc"}}],
                        }
                    }
                },
            }
        },
        "query": {
            "bool": {
                "filter": [
                    {"match_all": {}},
                    {
                        "term": {
                            "serial.keyword": str(event["pathParameters"]["serial"])
                        }
                    }
                ]
            }
        },
    }
    
    results = es.request(json.dumps(payload), path, "POST")
    output = [
        {k: v for k, v in data["1"]["hits"]["hits"][0]["_source"].items() if k != 'user-agent' and k != 'upload_time_delta'}
        
        for data in results["aggregations"]["3"]["buckets"] 
    ]
    s3 = boto3.resource('s3')
    object = s3.Object('sondehub-open-data', 'export/' + str(uuid.uuid4()))
    object.put(Body=json.dumps(output).encode('utf-8'), ACL='public-read', ContentType='application/json')
    return {"statusCode": 302, "headers": {"Location": f'https://{object.bucket_name}.s3.amazonaws.com/{object.key}'}}