from google.cloud import storage
import urllib
from mongo.helpers import get_mongo_collection
from bson.objectid import ObjectId
import os
import datetime
from subprocess import run, DEVNULL, CalledProcessError
import argparse
from urllib.error import URLError, HTTPError, ContentTooShortError
import logging


def main(args):
    uri = "mongodb://speechRecoUser:speech!reco@localhost/archSpeechReco"
    dbName = "archSpeechReco"
    colName = "moviesMeta"
    bucket = 'archspeechreco'

    col = get_mongo_collection(colName, dbName, uri)
    fileFormat = args.format

    if (fileFormat == 'mp4'):
        upload_mp4(col, bucket)
    elif (fileFormat == 'wav'):
        upload_wave(col, bucket)


def upload_mp4(col, bucket):
    to_upload = get_upload_list(col)

    for i in to_upload:
        file_name = ObjectId(i['_id'])
        get_vid(i['url'], ObjectId(i['_id']))
        upload_blob(bucket, "{}.mp4".format(file_name), "mp4/{}.mp4".format(file_name), col, "Mp4")
        try:
            os.remove("{}.mp4".format(file_name))
        except:
            print("{}.mp4 has NOT been removed".format(file_name))
        else:
            print("{}.mp4 has been removed".format(file_name))


def upload_wave(col, bucket):
    to_upload = get_wav_upload_list(col)

    for i in to_upload:
        file_name = ObjectId(i['_id'])
        get_vid(i['url'], ObjectId(i['_id']))
        get_wave("{}.mp4".format(file_name))
        upload_blob(bucket, "{}.wav".format(file_name), "wave/{}.wav".format(file_name), col, "Wav")
        try:
            os.remove("{}.wav".format(file_name))
        except:
            print("{}.wav has NOT been removed".format(file_name))
        else:
            print("{}.wav has been removed".format(file_name))


def upload_blob(bucket_name, source_file_name, destination_blob_name, col, file_format):
    """Uploads a file to the bucket."""
    storage_client = storage.Client()
    bucket = storage_client.get_bucket(bucket_name)
    blob = bucket.blob(destination_blob_name)

    try:
        blob.upload_from_filename(source_file_name)
    except:
        print("gcs upload failed")
    else:
        print('File {}.{} uploaded to {}.'.format(
            source_file_name,
            file_format,
            destination_blob_name))
        now = datetime.datetime.now()
        try:
            col.update_one(
                {"_id": ObjectId(source_file_name.split('.')[0])},
                {"$set": {
                    "gcs{}".format(file_format): {
                        "location": destination_blob_name,
                        "uploadDate": now.strftime("%Y-%m-%d %H:%M:%S")
                    }
                }
                }
            )
        except:
            print("mongo update failed")
        else:
            print("mongo update OK")


def get_upload_list(col):
    pipeline = [{"$match": {
        "gcsMp4": {"$exists": False}
    }
    }, {"$project": {
        "url": {"$concat": ["http://repozytorium.fn.org.pl/", {"$arrayElemAt": ["$mp4", 0]}]}
    }
    }]
    # $match phase, filetr documents withour gcs field - movies not uploaded to gcs
    # project phase, show only url and _id keys
    # skip first N documents
    # pipeline.append({"$skip":362})
    # fetch only N documents
    # pipeline.append({"$limit":20})

    return col.aggregate(pipeline)


def get_wav_upload_list(col):
    pipeline = [{"$match": {
        "gcsWav": {"$exists": False}
    }
    }, {"$project": {
        "url": {"$concat": ["http://repozytorium.fn.org.pl/", {"$arrayElemAt": ["$mp4", 0]}]}
    }
    }]
    # $match phase, filter documents without gcs field - movies not uploaded to gcs
    # project phase, show only url and _id keys
    # skip first N documents
    # pipeline.append({"$skip":362})
    # fetch only N documents
    # pipeline.append({"$limit":500})

    return col.aggregate(pipeline)


def get_vid(url, out):
    try:
        urllib.request.urlretrieve(url, "{}.mp4".format(out))
    except URLError as e:
        print("can't download, {}".format(e.reason))
    except HTTPError as e:
        print("reason:{}, Http code: {}", format(e.reason, e.code))
    except ContentTooShortError:
        print("content too short error")
    else:
        print("file {}.mp4 has been downloaded from {}".format(out, url))


def get_wave(filename):
    try:
        run(['ffmpeg', '-i', filename, '-vn', '-acodec', 'pcm_s16le', '-ar', '44100', '-ac', '1',
             filename.replace("mp4", "wav")], stdout=DEVNULL, check=True)
    except CalledProcessError as e:
        print("problem with ffmpeg, {} exited with {} code".format(e.cmd, e.returncode))
    else:
        print("file {} has been decoded to waw format".format(filename))
        try:
            os.remove(filename)
        except OSError as e:
            print("{} has NOT been removed, {}".format(filename, e.strerror))
        else:
            print("{} has been removed".format(filename))


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='GCS uploader')
    parser.add_argument("--format", default='mp4', help="format to fetch and upload, [mp4, wav]")
    args = parser.parse_args()
    main(args)