import os
import uuid

from flask import current_app

from app.s3_client import (
    get_s3_contents,
    get_s3_metadata,
    get_s3_object,
    set_s3_metadata,
)
from notifications_utils.s3 import s3upload as utils_s3upload

NEW_FILE_LOCATION_STRUCTURE = "{}-service-notify/{}.csv"


def get_csv_location(service_id, upload_id):
    return (
        current_app.config["CSV_UPLOAD_BUCKET"]["bucket"],
        NEW_FILE_LOCATION_STRUCTURE.format(service_id, upload_id),
        current_app.config["CSV_UPLOAD_BUCKET"]["access_key_id"],
        current_app.config["CSV_UPLOAD_BUCKET"]["secret_access_key"],
        current_app.config["CSV_UPLOAD_BUCKET"]["region"],
    )


def get_csv_upload(service_id, upload_id):
    return get_s3_object(*get_csv_location(service_id, upload_id))


def remove_blank_lines(filedata):
    # sometimes people upload files with hundreds of blank lines at the end
    data = filedata["data"]
    cleaned_data = "\r\n".join(line for line in data.splitlines() if line.strip())
    filedata["data"] = cleaned_data
    return filedata


def s3upload(service_id, filedata):

    filedata = remove_blank_lines(filedata)
    upload_id = str(uuid.uuid4())
    bucket_name, file_location, access_key, secret_key, region = get_csv_location(
        service_id, upload_id
    )
    if bucket_name == "":
        exp_bucket = current_app.config["CSV_UPLOAD_BUCKET"]["bucket"]
        exp_region = current_app.config["CSV_UPLOAD_BUCKET"]["region"]
        tier = os.getenv("NOTIFY_ENVIRONMENT")
        raise Exception(
            f"NO BUCKET NAME SHOULD BE: {exp_bucket} WITH REGION {exp_region} TIER {tier}"
        )

    utils_s3upload(
        filedata=filedata["data"],
        region=region,
        bucket_name=bucket_name,
        file_location=file_location,
        access_key=access_key,
        secret_key=secret_key,
    )
    return upload_id


def s3download(service_id, upload_id):
    return get_s3_contents(get_csv_upload(service_id, upload_id))


def set_metadata_on_csv_upload(service_id, upload_id, **kwargs):
    return set_s3_metadata(get_csv_upload(service_id, upload_id), **kwargs)


def get_csv_metadata(service_id, upload_id):
    return get_s3_metadata(get_csv_upload(service_id, upload_id))