#!/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, quote
from urllib2 import HTTPError
from common import *
from time import sleep


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


todo...
use/prefer public interfaces ? (export functions)


"""

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="p", help="folder to store files for public pads, default: p")
    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")
    p.add_argument("--folder", default=False, action="store_true", help="dump files in a folder named PADID (meta, text, html, dhtml), default: False")
    p.add_argument("--output", default=False, action="store_true", help="output changed padids on stdout")
    p.add_argument("--force", default=False, action="store_true", help="reload, even if revisions count matches previous")
    args = p.parse_args(args)

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

    if args.padid:
        padids = args.padid 
    else:
        padids = getjson(info['apiurl']+'listAllPads?'+urlencode(data))['data']['padIDs']
    padids.sort()
    numpads = len(padids)
    # maxmsglen = 0
    count = 0
    for i, padid in enumerate(padids):
        # TODO...
        """        
Self-containted documents / and/or document receipts
storing enough information to reconstruct (or understand an error occurred)
    """


        if args.skip != None and i<args.skip:
            continue
        progressbar(i, numpads, padid)
        
        data['padID'] = padid.encode("utf-8")
        p = padpath(padid, args.pub, args.group)
        if args.folder:
            p = os.path.join(p, padid.encode("utf-8"))

        metapath = p + ".meta.json"
        revisions = None
        tries = 1
        skip = False
        padurlbase = re.sub(r"api/1.2.9/$", "p/", info["apiurl"])
        meta = {}
        if type(padurlbase) == unicode:
            padurlbase = padurlbase.encode("utf-8")
        while True:
            try:
                if os.path.exists(metapath):
                    with open(metapath) as f:
                        meta.update(json.load(f))
                    revisions = getjson(info['apiurl']+'getRevisionsCount?'+urlencode(data))['data']['revisions']
                    if meta['revisions'] == revisions and not args.force:
                        skip=True
                        break
                
                ## TODO: OUTPUT TO DIRECTORIES with DATA EMBEDDED IN DOCUMENTS
                ## (or else in surrounding meta data!!)
                meta['padid'] = padid.encode("utf-8")
                versions = meta["versions"] = []
                versions.append({
                    "url": padurlbase + padid.encode("utf-8"),
                    "type": "pad",
                    "code": 200
                })

                if revisions == None:
                    meta['revisions'] = getjson(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['group'], meta['pad'] = splitpadname(padid)
                meta['pathbase'] = p
                meta['lastedited_raw'] = int(getjson(info['apiurl']+'getLastEdited?'+urlencode(data))['data']['lastEdited'])
                meta['lastedited_iso'] = datetime.fromtimestamp(int(meta['lastedited_raw'])/1000).isoformat()
                meta['author_ids'] = getjson(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
                else:
                    sleep(3)

        if skip:
            continue

        count += 1

        if args.output:
            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

        # Process text, html, dhtml, all options
        if args.all or args.html:
            html = getjson(info['apiurl']+'getHTML?'+urlencode(data))
            ver = {"type": "html"}
            versions.append(ver)
            ver["code"] = html["_code"]
            if html["_code"] == 200:
                html = html['data']['html']
                ver["path"] = p+".raw.html"
                ver["url"] = quote(ver["path"])
                with open(ver["path"], "w") as f:
                    f.write(html.encode("utf-8"))

        if args.all or args.text:
            text = getjson(info['apiurl']+'getText?'+urlencode(data))
            ver = {"type": "text"}
            versions.append(ver)
            ver["code"] = text["_code"]
            if text["_code"] == 200:
                text = text['data']['text']
                ver["path"] = p+".raw.txt"
                ver["url"] = quote(ver["path"])
                with open(ver["path"], "w") as f:
                    f.write(text.encode("utf-8"))
                # once the content is settled, compute a hash
                # and link it in the metadata!

        if args.all or args.dhtml:
            data['startRev'] = "0"
            html = getjson(info['apiurl']+'createDiffHTML?'+urlencode(data))
            ver = {"type": "diffhtml"}
            versions.append(ver)
            ver["code"] = html["_code"] 
            if html["_code"] == 200:
                html = html['data']['html']
                ver["path"] = p+".diff.html"
                ver["url"] = quote(ver["path"])
                with open(ver["path"], "w") as f:
                    f.write(html.encode("utf-8"))

        # output meta
        if args.all or args.meta:
            ver = {"type": "meta"}
            versions.append(ver)
            ver["path"] = metapath
            ver["url"] = quote(metapath)
            with open(metapath, "w") as f:
                json.dump(meta, f, indent=2)

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