#!/usr/bin/env python3
from __future__ import division

import lxml
import lxml.etree
import ox
import os
import json
import sys

source = sys.argv[1]
target = '%s.srt' % os.path.splitext(source)[0]
fps = 25
data = []
tree = lxml.etree.parse(source)

for g in tree.xpath('//generatoritem'):
    #start/end = relative position of the clip in the parent sequence.
    #in/out indicate the portion of the source media file to reference.
    _in = int(g.findall('in')[0].text)
    _out  = int(g.findall('out')[0].text)
    _start = int(g.findall('start')[0].text)
    _end = int(g.findall('end')[0].text)
    effect = g.findall('effect')
    assert len(effect) == 1
    for parameter in effect[0].findall('parameter'):
        if parameter.findall('parameterid')[0].text == 'str':
            value = parameter.findall('value')[0].text

    if _start == -1 and _end == -1:
        _start = _in
        _end = _out
    if _start == -1:
        _start = 0
    #print _in, _out, _start, _end, value
    value = '\n'.join([v.strip() for v in value.strip().split('\r')])
    value = value.replace('\n\n', '<br><br>\n')
    data.append({
        'in': _start/fps, 'out': (_end-1)/fps, 'value': value
    })

with open(target, 'wb') as f:
    f.write(ox.srt.encode(data))