from __future__ import print_function
from argparse import ArgumentParser
import sys, json, re, os
from datetime import datetime

try:
    # python2
    from urllib2 import urlopen, URLError, HTTPError
    from urllib import urlencode
except ImportError:
    # python3
    from urllib.parse import urlencode, quote
    from urllib.request import urlopen, URLError, HTTPError

from etherpump.commands.common import *
from time import sleep
from etherpump.commands.html5tidy import html5tidy
import html5lib
from xml.etree import ElementTree as ET
from fnmatch import fnmatch

# debugging
# import ElementTree as ET 

"""
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 try_deleting (files):
    for f in files:
        try:
            os.remove(f)
        except OSError as e:
            pass

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("--glob", default=False, help="download pads matching a glob pattern")

    p.add_argument("--padinfo", default=".etherpump/settings.json", help="settings, default: .etherpump/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.diff.html, 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")
    p.add_argument("--no-raw-ext", default=False, action="store_true", help="save plain text as padname with no (additional) extension")
    p.add_argument("--fix-names", default=False, action="store_true", help="normalize padid's (no spaces, special control chars) for use in file names")

    p.add_argument("--filter-ext", default=None, help="filter pads by extension")

    p.add_argument("--css", default="/styles.css", help="add css url to output pages, default: /styles.css")
    p.add_argument("--script", default="/versions.js", help="add script url to output pages, default: /versions.js")

    p.add_argument("--nopublish", default="__NOPUBLISH__", help="no publish magic word, default: __NOPUBLISH__")
    p.add_argument("--publish", default="__PUBLISH__", help="the publish magic word, default: __PUBLISH__")
    p.add_argument("--publish-opt-in", default=False, action="store_true", help="ensure `--publish` is honoured instead of `--nopublish`")

    args = p.parse_args(args)

    raw_ext = ".raw.txt"
    if args.no_raw_ext:
        raw_ext = ""

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

    if args.padid:
        padids = args.padid
    elif args.glob:
        padids = getjson(info['localapiurl']+'listAllPads?'+urlencode(data))['data']['padIDs']
        padids = [x for x in padids if fnmatch(x, args.glob)]
    else:
        padids = getjson(info['localapiurl']+'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
        progressbar(i, numpads, padid)
        
        data['padID'] = padid.encode("utf-8")
        p = padpath(padid, args.pub, args.group, args.fix_names)
        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['localapiurl']+'getRevisionsCount?'+urlencode(data))['data']['revisions']
                    if meta['revisions'] == revisions and not args.force:
                        skip=True
                        break
                
                meta['padid'] = padid # .encode("utf-8")
                versions = meta["versions"] = []
                versions.append({
                    "url": padurlbase + quote(padid),
                    "type": "pad",
                    "code": 200
                })

                if revisions == None:
                    meta['revisions'] = getjson(info['localapiurl']+'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['localapiurl']+'getLastEdited?'+urlencode(data))['data']['lastEdited'])
                meta['lastedited_iso'] = datetime.fromtimestamp(int(meta['lastedited_raw'])/1000).isoformat()
                meta['author_ids'] = getjson(info['localapiurl']+'listAuthorsOfPad?'+urlencode(data))['data']['authorIDs']
                break
            except HTTPError as e:
                tries += 1
                if tries > 3:
                    print ("Too many failures ({0}), skipping".format(padid), file=sys.stderr)
                    skip=True
                    break
                else:
                    sleep(3)
            except TypeError as e:
                print ("Type Error loading pad {0} (phantom pad?), skipping".format(padid), file=sys.stderr)
                skip=True
                break

        if skip:
            continue

        count += 1

        if args.output:
            print (padid)

        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.text:
            text = getjson(info['localapiurl']+'getText?'+urlencode(data))
            ver = {"type": "text"}
            versions.append(ver)
            ver["code"] = text["_code"]
            if text["_code"] == 200:
                text = text['data']['text']

                ##########################################
                ## ENFORCE __NOPUBLISH__ MAGIC WORD
                ##########################################
                if args.nopublish and args.nopublish in text:
                    # NEED TO PURGE ANY EXISTING DOCS
                    try_deleting((p+raw_ext,p+".raw.html",p+".diff.html",p+".meta.json"))
                    continue

                ##########################################
                ## ENFORCE __PUBLISH__ MAGIC WORD
                ##########################################
                if args.publish_opt_in and args.publish not in text:
                    try_deleting((p+raw_ext,p+".raw.html",p+".diff.html",p+".meta.json"))
                    continue

                ver["path"] = p+raw_ext
                ver["url"] = quote(ver["path"])
                with open(ver["path"], "w") as f:
                    f.write(text)
                # once the content is settled, compute a hash
                # and link it in the metadata!

        links = []
        if args.css:
            links.append({"href":args.css, "rel":"stylesheet"})
        # todo, make this process reflect which files actually were made
        versionbaseurl = quote(padid)
        links.append({"href":versions[0]["url"], "rel":"alternate", "type":"text/html", "title":"Etherpad"})
        if args.all or args.text:
            links.append({"href":versionbaseurl+raw_ext, "rel":"alternate", "type":"text/plain", "title":"Plain text"})
        if args.all or args.html:
            links.append({"href":versionbaseurl+".raw.html", "rel":"alternate", "type":"text/html", "title":"HTML"})
        if args.all or args.dhtml:
            links.append({"href":versionbaseurl+".diff.html", "rel":"alternate", "type":"text/html", "title":"HTML with author colors"})
        if args.all or args.meta:
            links.append({"href":versionbaseurl+".meta.json", "rel":"alternate", "type":"application/json", "title":"Meta data"})

        # links.append({"href":"/", "rel":"search", "type":"text/html", "title":"Index"})

        if args.all or args.dhtml:
            data['startRev'] = "0"
            html = getjson(info['localapiurl']+'createDiffHTML?'+urlencode(data))
            ver = {"type": "diffhtml"}
            versions.append(ver)
            ver["code"] = html["_code"] 
            if html["_code"] == 200:
                try:
                    html = html['data']['html']
                    ver["path"] = p+".diff.html"
                    ver["url"] = quote(ver["path"])
                    # doc = html5lib.parse(html, treebuilder="etree", override_encoding="utf-8", namespaceHTMLElements=False)
                    doc = html5lib.parse(html, treebuilder="etree", namespaceHTMLElements=False)
                    html5tidy(doc, indent=True, title=padid, scripts=args.script, links=links)
                    with open(ver["path"], "w") as f:
                        # f.write(html.encode("utf-8"))
                        print(ET.tostring(doc, method="html", encoding="unicode"), file=f)
                except TypeError:
                    # Malformed / incomplete response, record the message (such as "internal error") in the metadata and write NO file!
                    ver["message"] = html["message"]
                    # with open(ver["path"], "w") as f:
                    #     print ("""<pre>{0}</pre>""".format(json.dumps(html, indent=2)), file=f)

        # Process text, html, dhtml, all options
        if args.all or args.html:
            html = getjson(info['localapiurl']+'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"])
                doc = html5lib.parse(html, treebuilder="etree", namespaceHTMLElements=False)
                html5tidy(doc, indent=True, title=padid, scripts=args.script, links=links)
                with open(ver["path"], "w") as f:
                    # f.write(html.encode("utf-8"))
                    print (ET.tostring(doc, method="html", encoding="unicode"), file=f)

        # 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)