import os.path
import time
import json

from constants import CUT_OUTPUT_PATH
from subprocess import Popen,PIPE
from rq import get_current_job,Queue
from rq.job import Job
from rq.decorators import job
from worker import conn,q
from dateutil import tz

job_key_list = []
date_fmt='%d/%m/%Y, %H:%M'


def jobrunner(fn,args):
    job = fn.delay(args)
    job_key_list.append(job.get_id())
    return job

def utctolocal(date):
    date=date.replace(tzinfo=tz.tzutc())
    return date.astimezone(tz.tzlocal())

def result(job_key):
    """Get job result from key. throws exception if non-existing key"""
    job = Job.fetch(job_key, connection=conn)
    eq_at=utctolocal(job.enqueued_at)
    if job.is_finished:
        return ("Result: %s, enqueued at %s" %
                    (str(job.result),eq_at.strftime(date_fmt)), 200)
    else:
        return ("Process: %s" % json.dumps(job.meta), 202)

def jobs():
    ret = []
    for j in job_key_list:#q.jobs:
        job = Job.fetch(j, connection=conn)
        out = job.meta
        out["id"]=j
        out["eq"]=utctolocal(job.enqueued_at).strftime(date_fmt)
        out["finished"]=job.is_finished
        ret.append(out)
    return ret

@job('default',connection=conn, timeout=30)
def long_job(arg):
    for i in range(20):
        time.sleep(1)
        job = get_current_job()
        job.meta['progress'] = i
        job.save()
    #push to db, return id if ok. return error if not ok
    return "37"


@job('default',connection=conn, timeout=3600*2, result_ttl=3600*2)
def upload_video(title,thumb_path,video_path):
    import youtube_upload.main
    j=get_current_job()
    return youtube_upload.main.main(title,thumb_path,video_path,job=j)


@job('default',connection=conn, timeout=360*2, result_ttl=360*2)
def cut_video(in_fname,start_time,end_time,out_fname):
    if not os.path.isfile(in_fname):
        return { "status":"error",
                 "error": "El archivo %s no existe" % in_fname
               }
    out_fname=os.path.join(CUT_OUTPUT_PATH,out_fname)
    if os.path.isfile(out_fname):
        return { "status":"error",
                 "error": "El archivo %s existe" % out_fname
               }

    process = [ 'ffmpeg',
                '-loglevel', 'error',
                '-stats',
                '-i', in_fname,
                '-ss', str(start_time),
                '-t', str(end_time),
                '-c', 'copy',
                '-movflags', '+faststart',
                '-f','mp4',
                out_fname
              ]

    out = run_process(process)
    if out == "":
        out = { "status": "Proceso finalizado" }
    return out

def run_process(process = None):
    if process is None or type(process) is not list:
        return { "status": "error",
                 "error": "Argumento process invalido"
               }
    proc=Popen(process, stderr=PIPE, universal_newlines=True)
    while True:
        line = proc.stderr.readline()
        if line != '' and line !=b'':
            job = get_current_job()
            job.meta['progress'] = line.rstrip()
            job.save()
        else:
            break
    return ""