import base64
from urllib.parse import urlparse

from aws_lambda_powertools import Logger
from aws_lambda_powertools.utilities.data_classes import (
    EventBridgeEvent,
    event_source,
)
from aws_lambda_powertools.utilities.typing import LambdaContext
from layercake.dynamodb import DynamoDBPersistenceLayer
from layercake.strutils import first_word

from boto3clients import dynamodb_client, s3_client
from config import ENROLLMENT_TABLE
from docseal import create_submission_from_pdf

logger = Logger(__name__)
dyn = DynamoDBPersistenceLayer(ENROLLMENT_TABLE, dynamodb_client)


SUBJECT = '{first_name}, assine seu certificado agora!'
MESSAGE = """
{first_name},
Seu certificado já está pronto e aguardando apenas a sua assinatura digital.

[👉 Assinar agora.]({{submitter.link}})
"""


@event_source(data_class=EventBridgeEvent)
@logger.inject_lambda_context
def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
    new_image = event.detail['new_image']
    user = new_image['user']
    first_name = first_word(user['name'])
    file_bytes = _get_file_bytes(new_image['cert']['s3_uri'])
    file_base64 = base64.b64encode(file_bytes)

    create_submission_from_pdf(
        filename=new_image['id'],
        file=file_base64.decode('utf-8'),
        email_message={
            'subject': SUBJECT.format(first_name=first_name),
            'body': MESSAGE.format(first_name=first_name),
        },
        submitters=[
            {
                'role': 'First Party',
                'name': user['name'],
                'email': user['email'],
                'external_id': user['id'],
            },
        ],
    )

    return True


def _get_file_bytes(s3_uri: str) -> bytes:
    parsed = urlparse(s3_uri)
    bucket = parsed.netloc
    key = parsed.path.lstrip('/')

    r = s3_client.get_object(Bucket=bucket, Key=key)
    return r['Body'].read()