#!/usr/bin/env python
from __future__ import print_function
from argparse import ArgumentParser
import sys, json, re, os
from datetime import datetime
from urllib import urlencode
from urllib2 import urlopen, HTTPError, URLError
from math import ceil, floor
from common import *

"""
sync(meta):
    Update meta data files for those that have changed.
    Check for changed pads by looking at revisions & comparing to existing

"""

def jsonload (url):
    f = urlopen(url)
    data = f.read()
    f.close()
    return json.loads(data)

def load_padinfo(p):
    with open(p) as f:
        info = json.load(f)
    return info


def main (args):
    p = ArgumentParser("Check for pads that have changed since last sync (according to .meta.json)")
    p.add_argument("padid", nargs="*", default=[])
    p.add_argument("--padinfo", default=".etherdump/settings.json", help="settings, default: .etherdump/settings.json")
    p.add_argument("--zerorevs", default=False, action="store_true", help="include pads with zero revisions, default: False (i.e. pads with no revisions are skipped)")
    p.add_argument("--pub", default=".", help="folder to store files for public pads, default: pub")
    p.add_argument("--group", default="g", help="folder to store files for group pads, default: g")
    p.add_argument("--skip", default=None, type=int, help="skip this many items, default: None")
    p.add_argument("--meta", default=False, action="store_true", help="download meta to PADID.meta.json, default: False")
    p.add_argument("--text", default=False, action="store_true", help="download text to PADID.txt, default: False")
    p.add_argument("--html", default=False, action="store_true", help="download html to PADID.html, default: False")
    p.add_argument("--dhtml", default=False, action="store_true", help="download dhtml to PADID.dhtml, default: False")
    p.add_argument("--all", default=False, action="store_true", help="download all files (meta, text, html, dhtml), default: False")
    args = p.parse_args(args)

    info = load_padinfo(args.padinfo)
    data = {}
    data['apikey'] = info['apikey']

    if args.padid:
        padids = args.padid 
    else:
        padids = jsonload(info['apiurl']+'listAllPads?'+urlencode(data))['data']['padIDs']
    padids.sort()
    numpads = len(padids)
    # maxmsglen = 0
    count = 0
    for i, padid in enumerate(padids):
        if args.skip != None and i<args.skip:
            continue
        p = (float(i) / numpads)
        percentage = int(floor(p*100))
        bars = int(ceil(p*20))
        bar = ("*"*bars) + ("-"*(20-bars))
        msg = u"\r{0} {1}/{2} {3}... ".format(bar, (i+1), numpads, padid)
        # if len(msg) > maxmsglen:
        #     maxmsglen = len(msg)
        # sys.stderr.write("\r{0}".format(" "*maxmsglen))
        sys.stderr.write(msg.encode("utf-8"))
        sys.stderr.flush()
        
        data['padID'] = padid.encode("utf-8")
        p = padpath(padid, args.pub, args.group)
        metapath = p + ".meta.json"
        revisions = None
        tries = 1
        skip = False
        while True:
            try:
                if os.path.exists(metapath):
                    with open(metapath) as f:
                        meta = json.load(f)
                    revisions = jsonload(info['apiurl']+'getRevisionsCount?'+urlencode(data))['data']['revisions']
                    if meta['revisions'] == revisions:
                        skip=True
                        break
                
                meta = {'padid': padid.encode("utf-8")}
                if revisions == None:
                    meta['revisions'] = jsonload(info['apiurl']+'getRevisionsCount?'+urlencode(data))['data']['revisions']
                else:
                    meta['revisions' ] = revisions            

                if (meta['revisions'] == 0) and (not args.zerorevs):
                    # print("Skipping zero revs", file=sys.stderr)
                    skip=True
                    break

                # todo: load more metadata!
                meta['pad'], meta['group'] = splitpadname(padid)
                meta['pathbase'] = p
                meta['lastedited_raw'] = int(jsonload(info['apiurl']+'getLastEdited?'+urlencode(data))['data']['lastEdited'])
                meta['lastedited_iso'] = datetime.fromtimestamp(int(meta['lastedited_raw'])/1000).isoformat()
                meta['author_ids'] = jsonload(info['apiurl']+'listAuthorsOfPad?'+urlencode(data))['data']['authorIDs']
                break
            except HTTPError as e:
                tries += 1
                if tries > 3:
                    print ("Too many failures ({0}), skipping".format(padid).encode("utf-8"), file=sys.stderr)
                    skip=True
                    break

        if skip:
            continue

        count += 1

        print (padid.encode("utf-8"))

        if args.all or (args.meta or args.text or args.html or args.dhtml):
            try:
                os.makedirs(os.path.split(metapath)[0])
            except OSError:
                pass

        if args.all or args.meta:
            with open(metapath, "w") as f:
                json.dump(meta, f)

        # Process text, html, dhtml, all options
        if args.all or args.text:
            text = jsonload(info['apiurl']+'getText?'+urlencode(data))
            text = text['data']['text']
            with open(p+".txt", "w") as f:
                f.write(text.encode("utf-8"))

        if args.all or args.html:
            html = jsonload(info['apiurl']+'getHTML?'+urlencode(data))
            html = html['data']['html']
            with open(p+".html", "w") as f:
                f.write(html.encode("utf-8"))

        if args.all or args.dhtml:
            data['startRev'] = "0"
            html = jsonload(info['apiurl']+'createDiffHTML?'+urlencode(data))
            html = html['data']['html']
            with open(p+".diff.html", "w") as f:
                f.write(html.encode("utf-8"))

    print("\n{0} pad(s) changed".format(count), file=sys.stderr)