# -*- coding: utf-8 -*-
# CurlyTx main window
# Copyright (C) 2011 Christian Weiske <cweiske@cweiske.de>
# License: GPLv3 or later

from . import _

from Screens.Screen import Screen
from Screens.HelpMenu import HelpableScreen
from Components.Label import Label
from Components.ScrollLabel import ScrollLabel
from Components.ActionMap import ActionMap
from Components.Sources.StaticText import StaticText
from Tools import Directories
from twisted.web import client
from twisted.web.client import _makeGetterFactory, HTTPClientFactory
from enigma import gFont

from . import config
from config import createPage, loadDefaultPageOptions, feedPagesToConfig, feedSettingsToConfig, savePageConfig
from Components.config import config

import os

class CurlyTx(Screen, HelpableScreen):
    skin = """
        <screen name="CurlyTx" position="center,center" size="560,430" title="CurlyTx" >
	  <ePixmap position="0,0" size="140,40" pixmap="skin_default/buttons/red.png" transparent="1" alphatest="on" />
	  <ePixmap position="140,0" size="140,40" pixmap="skin_default/buttons/green.png" transparent="1" alphatest="on" />
	  <ePixmap position="280,0" size="140,40" pixmap="skin_default/buttons/yellow.png" transparent="1" alphatest="on" />
	  <ePixmap position="420,0" size="140,40" pixmap="skin_default/buttons/blue.png" transparent="1" alphatest="on" />
	  <widget source="key_red" render="Label" position="0,0" zPosition="1" size="140,40" valign="center" halign="center" font="Regular;21" transparent="1" foregroundColor="white" />
	  <widget source="key_green" render="Label" position="140,0" zPosition="1" size="140,40" valign="center" halign="center" font="Regular;21" transparent="1" foregroundColor="white" />
	  <widget source="key_yellow" render="Label" position="280,0" zPosition="1" size="140,40" valign="center" halign="center" font="Regular;21" transparent="1" foregroundColor="white" />
	  <widget source="key_blue" render="Label" position="420,0" zPosition="1" size="140,40" valign="center" halign="center" font="Regular;21" transparent="1" foregroundColor="white" />
	  <widget name="text" position="5,45" size="550,380" font="Console;20" />
        </screen>"""

    currentUrl = None
    currentPage = None
    currentFontSize = 20
    httpGetterFactory = None
    showingHeaders = False
    staticPageFeedFile = 'curlytx-pagefeed.xml'

    def __init__(self, session, args = None):
        #self.skin = CurlyTx.skin
        Screen.__init__(self, session)
        HelpableScreen.__init__(self)
        #self.skinName = [ "CurlyTx", "Setup" ]

        self["text"] = ScrollLabel("foo")

        self["key_red"]    = StaticText(_("Settings"))
        self["key_green"]  = StaticText(_("Reload"))
        self["key_yellow"] = StaticText(_("Prev"))
        self["key_blue"]   = StaticText(_("Next"))


        self["actions"] = ActionMap(
            ["WizardActions", "ColorActions", "InputActions", "InfobarEPGActions"], {
                "ok":   self.close,
                "back": self.close,
                "up":   self.pageUp,
                "down": self.pageDown,

                "red":    self.showSettings,
                "green":  self.reload,
                "yellow": self.prevPage,
                "blue":   self.nextPage,

                "showEventInfo": self.showHeader
            }, -1)

        self.loadHelp()
        self.loadButtons()
        self.onFirstExecBegin.append(self.afterLayout)

    def afterLayout(self):
        self.setTextFont
        self.loadStaticConfig()
        self.loadUrl(config.plugins.CurlyTx.defaultPage.value)

    def loadHelp(self):
        self.helpList.append((
                self["actions"], "WizardActions",
                [("up", _("Scroll page contents up"))]))
        self.helpList.append((
                self["actions"], "WizardActions",
                [("down", _("Scroll page contents down"))]))
        self.helpList.append((
                self["actions"], "InfobarEPGActions",
                [("showEventInfo", _("Show HTTP response headers"))]))
        self.helpList.append((
                self["actions"], "ColorActions",
                [("red", _("Show program settings"))]))
        self.helpList.append((
                self["actions"], "ColorActions",
                [("green", _("Reload current page URL"))]))
        self.helpList.append((
                self["actions"], "ColorActions",
                [("yellow", _("Switch to next configured page URL"))]))
        self.helpList.append((
                self["actions"], "ColorActions",
                [("blue", _("Switch to previous configured page URL"))]))
        self.helpList.append((
                self["actions"], "WizardActions",
                [("ok", _("Close window"))]))
        self.helpList.append((
                self["actions"], "WizardActions",
                [("back", _("Close window"))]))

    def loadButtons(self):
        pageCount = len(config.plugins.CurlyTx.pages)
        if pageCount == 0:
            self["key_green"].setText("")
            self["key_yellow"].setText("")
            self["key_blue"].setText("")
        elif pageCount == 1:
            self["key_green"].setText(_("Reload"))
            self["key_yellow"].setText("")
            self["key_blue"].setText("")
        else:
            self["key_green"].setText(_("Reload"))
            self["key_yellow"].setText(_("Prev"))
            self["key_blue"].setText(_("Next"))

        if config.plugins.CurlyTx.enableSettings.getValue():
            self["key_red"].setText(_("Settings"))
        else:
            self["key_red"].setText("")

    def pageUp(self):
        self["text"].pageUp()

    def pageDown(self):
        self["text"].pageDown()

    def prevPage(self):
        if self.currentPage == None:
            return

        pageId = self.currentPage - 1
        if pageId < 0:
            pageId = len(config.plugins.CurlyTx.pages) - 1
        self.loadUrl(pageId)

    def nextPage(self):
        if self.currentPage == None:
            return

        pageId = self.currentPage + 1
        if pageId > len(config.plugins.CurlyTx.pages) - 1:
            pageId = 0
        self.loadUrl(pageId)

    def reload(self):
        if self.currentPage == None:
            return

        self.loadUrl(self.currentPage)

    def loadUrl(self, pageId):
        self.httpGetterFactory = None
        if pageId == None:
            self.loadNoPage()
            return

        cfg = config.plugins.CurlyTx
        pageCount = len(cfg.pages)
        pageId = int(pageId)
        if pageId > (pageCount - 1):
            if len(cfg.pages) == 0:
                self.loadNoPage()
            else:
                self["text"].setText(_("Invalid page") + " " + pageId);
            return

        url   = cfg.pages[pageId].uri.value
        title = cfg.pages[pageId].title.value

        if pageCount > 1:
            title = "{0} [{1}/{2}]".format(title, pageId + 1, pageCount)

        self.currentPage = pageId
        self.currentUrl = url
        self.currentFontSize = cfg.pages[pageId].fontSize.value

        self.setTitle(title)
        self.setTextFont()
        self["text"].setText(_("Loading ...") + "\n" + url);

        if (url.startswith('file://')):
            self.loadLocalFile(url)
        else:
            self.getPageWebClient(url).addCallback(self.urlLoaded).addErrback(self.urlFailed, url)

    def loadLocalFile(self, url):
        file = url[7:]
        if not os.path.exists(file):
            self.showFail('File does not exist', file)
            return

        with open(file, 'r') as f:
            self.urlLoaded(f.read())

    def setTextFont(self):
        if self["text"].long_text is not None:
            self["text"].long_text.setFont(gFont("Console", self.currentFontSize))

    def urlLoaded(self, html):
        self["text"].setText(html)

    def urlFailed(self, error, url):
        self.showFail(error.getErrorMessage(), url)

    def showFail(self, message, url):
        self["text"].setText(
            _("Error fetching URL:") + "\n " + message
            + "\n\nURL: " + url
            )

    def loadNoPage(self):
        self["text"].setText(_("Go and add a page in the settings"));

    def showHeader(self):
        if not self.httpGetterFactory:
            return

        if self.showingHeaders:
            self["text"].setText(self.pageContent)
            self.pageContent    = None
            self.showingHeaders = False
        elif self.httpGetterFactory.response_headers:
            headers = _("HTTP response headers for") + "\n" + self.currentUrl + "\n\n"
            for (k, v) in self.httpGetterFactory.response_headers.items():
                headers += k + ": " + ("\n" + k + ": ").join(v) + "\n"
            self.pageContent = self["text"].getText()
            self["text"].setText(headers)
            self.showingHeaders = True

    def showSettings(self):
        if not config.plugins.CurlyTx.enableSettings.getValue():
            return

        from CurlyTxSettings import CurlyTxSettings
        self.session.openWithCallback(self.onSettingsChanged, CurlyTxSettings)

    def onSettingsChanged(self):
        self.loadButtons()
        if len(config.plugins.CurlyTx.pages) == 0:
            self.currentPage = None
            self.loadUrl(self.currentPage)
        elif self.currentPage == None:
            self.currentPage = 0
            self.loadUrl(self.currentPage)


    def getPageWebClient(self, url, contextFactory=None, *args, **kwargs):
        """
        Download a web page as a string.

        COPY OF twisted.web.client.getPage to store the factory

        Download a page. Return a deferred, which will callback with a
        page (as a string) or errback with a description of the error.

        See L{HTTPClientFactory} to see what extra arguments can be passed.
        """
        self.httpGetterFactory = _makeGetterFactory(
            url,
            HTTPClientFactory,
            contextFactory=contextFactory,
            *args, **kwargs)
        return self.httpGetterFactory.deferred

    def loadStaticConfig(self):
        """
        Always try to load the static config file from
        /etc/enigma2/curlytx-pagefeed.xml
        """
        staticFeedPath = Directories.resolveFilename(Directories.SCOPE_CONFIG, self.staticPageFeedFile)
        if not os.path.exists(staticFeedPath):
            return

        from AtomFeed import AtomFeed
        AtomFeed(
            'file://' + staticFeedPath,
            self.saveStaticConfig, self.loadStaticConfigFail
            )

    def loadStaticConfigFail(self, errorMessage):
        """ Loading the page url feed failed somehow """
        from Screens.MessageBox import MessageBox
        self.session.open(
            MessageBox,
            _("Error loading page feed:") + "\n\n" + str(errorMessage),
            type = MessageBox.TYPE_ERROR
            )

    def saveStaticConfig(self, pages, settings):
        feedPagesToConfig(pages)
        feedSettingsToConfig(settings)
        savePageConfig()
        self.loadButtons()