# Copyright: Damien Elmes <anki@ichi2.net>
# -*- coding: utf-8 -*-
# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html

import sys, os, re, traceback, time
from cStringIO import StringIO
from aqt.qt import *
from aqt.utils import showInfo, showWarning, openFolder, isWin, openLink
from anki.hooks import runHook, addHook, remHook
from aqt.webview import AnkiWebView
from zipfile import ZipFile
import aqt.forms
import aqt
from anki.sync import httpCon
import aqt.sync # monkey-patches httplib2

class AddonManager(object):

    def __init__(self, mw):
        self.mw = mw
        f = self.mw.form; s = SIGNAL("triggered()")
        self.mw.connect(f.actionOpenPluginFolder, s, self.onOpenAddonFolder)
        self.mw.connect(f.actionDownloadSharedPlugin, s, self.onGetAddons)
        if isWin:
            self.clearAddonCache()
        sys.path.insert(0, self.addonsFolder())
        self.loadAddons()

    def files(self):
        return [f for f in os.listdir(self.addonsFolder())
                if f.endswith(".py")]

    def loadAddons(self):
        for file in self.files():
            try:
                __import__(file.replace(".py", ""))
            except:
                traceback.print_exc()

    # Menus
    ######################################################################

    def onOpenAddonFolder(self, path=None):
        if path is None:
            path = self.addonsFolder()
        openFolder(path)

    # Tools
    ######################################################################

    def addonsFolder(self):
        dir = self.mw.pm.addonFolder()
        if isWin:
            dir = dir.encode(sys.getfilesystemencoding())
        return dir

    def clearAddonCache(self):
        "Clear .pyc files which may cause crashes if Python version updated."
        dir = self.addonsFolder()
        for curdir, dirs, files in os.walk(dir):
            for f in files:
                if not f.endswith(".pyc"):
                    continue
                os.unlink(os.path.join(curdir, f))

    def registerAddon(self, name, updateId):
        # not currently used
        return

    # Installing add-ons
    ######################################################################

    def onGetAddons(self):
        GetAddons(self.mw)

    def install(self, data, fname):
        if fname.endswith(".py"):
            # .py files go directly into the addon folder
            path = os.path.join(self.addonsFolder(), fname)
            open(path, "w").write(data)
            return
        # .zip file
        z = ZipFile(StringIO(data))
        base = self.addonsFolder()
        for n in z.namelist():
            if n.endswith("/"):
                # folder; ignore
                continue
            # write
            z.extract(n, base)

class GetAddons(QDialog):

    def __init__(self, mw):
        QDialog.__init__(self, mw)
        self.mw = mw
        self.form = aqt.forms.getaddons.Ui_Dialog()
        self.form.setupUi(self)
        b = self.form.buttonBox.addButton(
            _("Browse"), QDialogButtonBox.ActionRole)
        self.connect(b, SIGNAL("clicked()"), self.onBrowse)
        self.exec_()

    def onBrowse(self):
        openLink(aqt.appShared + "addons/")

    def accept(self):
        try:
            code = int(self.form.code.text())
        except ValueError:
            showWarning(_("Invalid code."))
            return
        QDialog.accept(self)
        # create downloader thread
        self.thread = AddonDownloader(code)
        self.connect(self.thread, SIGNAL("recv"), self.onRecv)
        self.recvBytes = 0
        self.thread.start()
        self.mw.progress.start(immediate=True)
        while not self.thread.isFinished():
            self.mw.app.processEvents()
            self.thread.wait(100)
        if not self.thread.error:
            # success
            self.mw.addonManager.install(self.thread.data, self.thread.fname)
            self.mw.progress.finish()
            showInfo(_("Download successful. Please restart Anki."))
        else:
            self.mw.progress.finish()
            showWarning(_("Download failed: %s") % self.thread.error)

    def onRecv(self, total):
        self.mw.progress.update(label="%dKB downloaded" % (total/1024))

class AddonDownloader(QThread):

    def __init__(self, code):
        QThread.__init__(self)
        self.code = code

    def run(self):
        # setup progress handler
        self.byteUpdate = time.time()
        self.recvTotal = 0
        def canPost():
            if (time.time() - self.byteUpdate) > 0.1:
                self.byteUpdate = time.time()
                return True
        def recvEvent(bytes):
            self.recvTotal += bytes
            if canPost():
                self.emit(SIGNAL("recv"), self.recvTotal)
        addHook("httpRecv", recvEvent)
        con =  httpCon()
        try:
            resp, cont = con.request(
                aqt.appShared + "download/%d" % self.code)
        except Exception, e:
            self.error = unicode(e)
            return
        finally:
            remHook("httpRecv", recvEvent)
        if resp['status'] == '200':
            self.error = None
            self.fname = re.match("attachment; filename=(.+)",
                                  resp['content-disposition']).group(1)
            self.data = cont
        elif resp['status'] == '403':
            self.error = _("Invalid code.")
        else:
            self.error = _("Error downloading: %s") % resp['status']