from google.cloud import storage
import sys
import urllib
from pymongo import MongoClient
from bson.objectid import ObjectId
import os
import datetime
from subprocess import run,DEVNULL
import argparse

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

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

    if (fileFormat == 'mp4'):
        uploadMp4(col,bucket)   
    elif (fileFormat == 'wav'): 
        uploadWave(col,bucket)

def uploadMp4(col,bucket):
    toUpload = getUploadList(col)

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


def uploadWave(col,bucket):
    toUpload = getWavUploadList(col)

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


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


def getMongoCollection(colName,dbName,uri):
    client = MongoClient(uri)
    db = client[dbName]
    col = db[colName]
    
    return col


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

def getWavUploadList(col):
        pipeline = []
        #$match phase, filetr documents withour gcs field - movies not uploaded to gcs
        pipeline.append({"$match": {
                                "gcsWav": {"$exists": False}
                                    }
                       })
        #project phase, show only url and _id keys
        pipeline.append({"$project": {
                                "url": { "$concat": [ "http://repozytorium.fn.org.pl/",{"$arrayElemAt": [ "$mp4",0 ]}]  }
                                    }
                       })
        #skip first N documents
        #pipeline.append({"$skip":362})
        #fetch only N documents
        #pipeline.append({"$limit":500})

        return col.aggregate(pipeline)


def getVid(url,out):
    try:
        urllib.request.urlretrieve(url, "{}.mp4".format(out))
    except:
        print("wrong URL, can't download")


def getWave(filename):
    try:
        run(['ffmpeg','-i', filename, '-vn', '-acodec', 'pcm_s16le', '-ar', '44100', '-ac', '1', filename.replace("mp4","wav")],stdout=DEVNULL)
    except:
        print("problem with ffmpeg")
    else:
        try:
            os.remove(filename)
        except:
            print("{} has NOT been removed".format(filename))
        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)