#!/usr/bin/python3
import os
import glob
import re
from datetime import datetime, timedelta
from pytimeparse.timeparse import timeparse


silences = []

os.chdir("/srv/recording/silence")
for s in glob.glob("*.txt"):
    with open(s, 'r') as f:
        t = f.read()

    # parse start time from the filename
    start_of_flac = datetime.strptime(s, "%Y-%m-%d_%H-%M-%S.flac.txt")


    # flacs are not necessarily 1 hour long, but ffmpeg thankfully also writes
    # out some timestamps, so we use the last one to determine the length
    length_of_flac = None
    for l in t.split("\n"):
        m = re.match(r"size=.* time=([0-9:.]+) .*", l)
        if m:
            length_of_flac = timeparse(m.group(1))

    silence_start = None
    for l in t.split("\n"):
        m = re.search(r"silence_start: ([-0-9.]+)", l)
        if m:
            silence_start = float(m.group(1))
            silence_end = length_of_flac  # fallback
        m = re.search(r"silence_end: ([-0-9.]+)", l)
        if m:
            silence_end = float(m.group(1))
            silences.append((start_of_flac + timedelta(seconds=silence_start), start_of_flac + timedelta(seconds=silence_end)))

            # reset
            silence_start = None
            silence_end = length_of_flac

    # if there is no "end of silence", ffmpeg does not report it
    if silence_start:
        silences.append((start_of_flac + timedelta(seconds=silence_start), start_of_flac + timedelta(seconds=silence_end)))

silences = sorted(silences)


FORMAT="%Y-%m-%d %H:%M:%S"
for silence_start, silence_end in silences:
    duration = silence_end - silence_start
    print("%s;%s;%d" % (silence_start.strftime(FORMAT), silence_end.strftime(FORMAT), round(duration.total_seconds())))