#!/usr/bin/env python
from __future__ import print_function
from argparse import ArgumentParser
import json, sys
from urllib import urlencode
from urllib2 import urlopen, HTTPError, URLError

p = ArgumentParser("")
p.add_argument("padid", help="the padid")
p.add_argument("--startrev", type=int, default=2, help="starting revision")
p.add_argument("--endrev", type=int, default=None, help="ending revision, default: last")
p.add_argument("--padinfo", default="padinfo.json", help="padinfo, default: padinfo.json")
p.add_argument("--dir", default="out")
args = p.parse_args()

with open(args.padinfo) as f:
	info = json.load(f)
apiurl =  "{0[protocol]}://{0[hostname]}:{0[port]}{0[apiurl]}{0[apiversion]}/".format(info)
data = {}
data['apikey'] = info['apikey']
data['padID'] = args.padid.encode("utf-8")


total_revisions = apiurl+'getRevisionsCount?'+urlencode(data)
total_revisions = json.load(urlopen(total_revisions))['data']['revisions']
rev = args.startrev 
print ("Dumping {0} revisions...".format(total_revisions), file=sys.stderr)

data['startRev'] = "1"
while rev <= total_revisions:
	data['endRev'] = "{0}".format(rev)
	requesturl = apiurl+'createDiffHTML?'+urlencode(data)
	html = json.load(urlopen(requesturl))['data']['html']
	out = "{0}/{1}_{2:06d}.html".format(args.dir, args.padid, rev)
	print ("writing {0}".format(out), file=sys.stderr)
	with open(out, "w") as f:
		f.write(html.encode("utf-8"))
	rev += 1