#!/usr/bin/env python3
#
# Usage:
#   ./autocompile.py path ext1
#
# Blocks monitoring |path| and its subdirectories for modifications on
# files ending with suffix |extk|. Run |cmd| each time a modification
# is detected. |cmd| is optional and defaults to 'make'.

import subprocess
import sys
import os
import pyinotify

from db import db,file_info
from constants  import RAW_PATH,INCOMING_PATH
from subprocess import Popen,PIPE

class OnWriteHandler(pyinotify.ProcessEvent):
    def my_init(self, cwd, extension, cmd):
        self.cwd = cwd
        self.extension = extension
        self.cmd = cmd

    def _run_cmd(self,path):
        print('==> Modification detected')
        d=db()
        out_fname=os.path.join(RAW_PATH, os.path.basename(path).replace('flv','mp4'))
        in_fname=os.path.join(self.cwd, path)
        if os.path.isfile(out_fname):
            #exists
            return
        process=[ 'ffmpeg',
                '-loglevel', 'error',
                '-i', in_fname,
                '-c', 'copy',
                '-movflags', '+faststart',
                '-f','mp4',
                out_fname
              ]

        print(" ".join(process))
        proc=Popen(process, universal_newlines=True)
        proc.wait()
        rc = proc.returncode
        if rc != 0:
            print("Error?")
            return
        d.insert_raw(file_info(out_fname))

    def process_IN_CLOSE_WRITE(self, event):
        if not event.pathname.endswith(self.extension):
            return
        print(event.mask, event.maskname, event.pathname)
        self._run_cmd(event.pathname)

def auto_compile(path, extension, cmd):
    wm = pyinotify.WatchManager()
    handler = OnWriteHandler(cwd=path, extension=extension, cmd=cmd)
    notifier = pyinotify.Notifier(wm, default_proc_fun=handler)
    wm.add_watch(path, pyinotify.ALL_EVENTS, rec=True, auto_add=True)
    print('==> Start monitoring %s' % path)
    notifier.loop()

if __name__ == '__main__':
    if len(sys.argv) < 3:
        print ("Command line error: missing argument(s).")
        sys.exit(1)

    # Required arguments
    path = sys.argv[1]
    extension = sys.argv[2]

    # Optional argument
    cmd = 'ls'
    if len(sys.argv) == 4:
        cmd = sys.argv[3]

    # Blocks monitoring
    auto_compile(path, extension, cmd)