#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""Tests the audacity pipe.

Depends on Destreamer and python-dateutil

"""


from subprocess import call
import os
import sys
from pathlib import Path
import dateutil.parser as dparser
import re

# TODO
path_to_destreamer = os.path.abspath(sys.argv[1])
working_dir = os.path.abspath(sys.argv[2])
urls = sys.argv[3:]

# Platform specific constants
if sys.platform == 'win32':
    print("recording-test.py, running on windows")
    PIPE_TO_AUDACITY = '\\\\.\\pipe\\ToSrvPipe'
    PIPE_FROM_AUDACITY = '\\\\.\\pipe\\FromSrvPipe'
    EOL = '\r\n\0'
else:
    print("recording-test.py, running on linux or mac")
    PIPE_TO_AUDACITY = '/tmp/audacity_script_pipe.to.' + str(os.getuid())
    PIPE_FROM_AUDACITY = '/tmp/audacity_script_pipe.from.' + str(os.getuid())
    EOL = '\n'


print("Write to  \"" + PIPE_TO_AUDACITY +"\"")
if not os.path.exists(PIPE_TO_AUDACITY):
    print(""" ..does not exist.
    Ensure Audacity is running with mod-script-pipe.""")
    sys.exit()

print("Read from \"" + PIPE_FROM_AUDACITY +"\"")
if not os.path.exists(PIPE_FROM_AUDACITY):
    print(""" ..does not exist.
    Ensure Audacity is running with mod-script-pipe.""")
    sys.exit()

print("-- Both pipes exist.  Good.")

TOPIPE = open(PIPE_TO_AUDACITY, 'w')
print("-- File to write to has been opened")
FROMPIPE = open(PIPE_FROM_AUDACITY, 'r')
print("-- File to read from has now been opened too\r\n")


def send_command(command):
    """Send a command to Audacity."""
    print("Send: >>> "+command)
    TOPIPE.write(command + EOL)
    TOPIPE.flush()


def get_response():
    """Get response from Audacity."""
    line = FROMPIPE.readline()
    result = ""
    while True:
        result += line
        line = FROMPIPE.readline()
        # print(f"Line read: [{line}]")
        if line == '\n':
            return result


def do_command(command):
    """Do the command. Return the response."""
    send_command(command)
    # time.sleep(0.1) # may be required on slow machines
    response = get_response()
    print("Rcvd: <<< " + response)
    return response


def export(filename):
    """Export the new track, and deleted both tracks."""
    do_command("Select: Track=1 mode=Set")
    do_command("SelTrackStartToEnd")
    do_command("Export2: Filename={} NumChannels=1.0".format(filename))
    do_command("SelectAll")
    do_command("RemoveTracks")


def do_command(command):
    """Send one command, and return the response."""
    send_command(command)
    response = get_response()
    print("Rcvd: <<< \n" + response)
    return response

def mkdir_if_not_exists(directory):
    if not os.path.exists(directory):
        os.makedirs(directory)
    return os.path.abspath(directory)

def do():
    mkdir_if_not_exists(working_dir)
    if working_dir:
        # Setup
        #os.chdir(working_dir)
        downloaded = mkdir_if_not_exists(working_dir + "/downloaded")
        processed_audio_dir = mkdir_if_not_exists(working_dir + "/processed_audio")
        final = mkdir_if_not_exists(working_dir + "/final")
        # Download videos
        print("Using destreamer.js at {}".format(path_to_destreamer))
        call("node --max-http-header-size 32768 {} --skip -k -o {} -i {}".format(path_to_destreamer, downloaded, " ".join(urls)), shell=True)
        for entry in os.scandir(downloaded):
            # Normalise names
            # Put file extension to one side for safekeeping
            split = entry.name.split('.')
            extension = split[1]
            name = split[0].replace(',', '').split('#')[0] # Discard all commas, and unique id doodad
            head, sep, tail = name.partition(' ') # Discard leading date
            split2 = tail.split()
            date = dparser.parse(split2[-1], fuzzy=True) # Parse the date
            folder_path = split2[0] + split2[1] # TODO Fragile
            title = re.search(r'\d+-\d+\s[\d\w\s]*', tail)
            if re.match:
                title = title.group(0).strip().replace(' ', '_')
                # Add date back
                if date is not None:
                    title += "_" + date.strftime('%Y-%m-%d')
                # Rename file
                source = entry.path
                actual_folder_path = '{}/{}'.format(target, folder_path)
                filename = "{}.{}".format(title, extension)
                dest = "{}/{}".format(actual_folder_path, filename)
                print ("Source: " + source)
                print ("Dest: " + dest)
                mkdir_if_not_exists(actual_folder_path)
                os.rename(source, dest)

                # Extract audio, process it, add it back to the video
                video_in = os.path.abspath(filename)
                processed_audio = processed_audio_dir.joinpath(filename + ".wav")
                final_output_name = final.joinpath(filename)
                do_command("Import2: Filename={}".format(video_in))
                do_command("SelectAll:")
                do_command('Popmute:')
                do_command("SelectAll:")
                do_command('Amplify:')
                export(processed_audio)
                do_command('Close:')
                # TODO Move to different script?
                final_output_name = "output-" + video_in
                print("Combining video with audio at {}", processed_audio)
                call('ffmpeg -i {} -i {} -acodec copy -vcodec copy -f mkv {}'.format(video_in, processed_audio, final_output_name), shell=True)

do()