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

from PyQt4.QtGui import *
from PyQt4.QtCore import *
import anki, anki.utils
from anki.sound import playFromText, stripSounds
from anki.latex import renderLatex, stripLatex
from anki.utils import stripHTML
from anki.hooks import runHook
import types, time, re, os, urllib, sys
from ankiqt import ui
from ankiqt.ui.utils import mungeQA
from anki.utils import fmtTimeSpan
from PyQt4.QtWebKit import QWebPage, QWebView

failedCharColour = "#FF0000"
passedCharColour = "#00FF00"
futureWarningColour = "#FF0000"

# Views - define the way a user is prompted for questions, etc
##########################################################################

class View(object):
    "Handle the main window update as we transition through various states."

    def __init__(self, parent, body, frame=None):
        self.main = parent
        self.body = body
        self.frame = frame
        self.main.connect(self.body, SIGNAL("loadFinished(bool)"),
                          self.onLoadFinished)

    # State control
    ##########################################################################

    def setState(self, state):
        "Change to STATE, and update the display."
        self.oldState = getattr(self, 'state', None)
        self.state = state
        if self.state == "initial":
            return
        elif self.state == "noDeck":
            self.clearWindow()
            self.drawWelcomeMessage()
            self.flush()
            return
        self.redisplay()

    def redisplay(self):
        "Idempotently display the current state (prompt for question, etc)"
        if self.state == "noDeck" or self.state == "studyScreen":
            return
        self.clearWindow()
        self.haveTop = (self.main.lastCard and (
            self.main.config['showLastCardContent'] or
            self.main.config['showLastCardInterval'])) or (
            self.main.currentCard and self.main.currentCard.due > time.time())
        self.drawRule = (self.main.config['qaDivider'] and
                         self.main.currentCard and
                         not self.main.currentCard.cardModel.questionInAnswer)
        if not self.main.deck.isEmpty():
            if self.haveTop:
                self.drawTopSection()
        if self.state == "showQuestion":
            self.drawQuestion()
            if self.drawRule:
                self.write("<hr>")
        elif self.state == "showAnswer":
            if not self.main.currentCard.cardModel.questionInAnswer:
                self.drawQuestion(nosound=True)
            if self.drawRule:
                self.write("<hr>")
            self.drawAnswer()
        elif self.state == "deckEmpty":
            self.drawWelcomeMessage()
        elif self.state == "deckFinished":
            self.drawDeckFinishedMessage()
        self.flush()

    def addStyles(self):
        # card styles
        s = "<style>\n"
        if self.main.deck:
            s += self.main.deck.css
        s += "div { white-space: pre-wrap; }"
        s += "</style>"
        return s

    def clearWindow(self):
        self.body.setHtml("")
        self.buffer = ""

    # Font properties & output
    ##########################################################################

    def flush(self):
        "Write the current HTML buffer to the screen."
        self.buffer = self.addStyles() + self.buffer
        # hook for user css
        runHook("preFlushHook")
        #print self.buffer.encode("utf-8")
        self.body.setHtml(self.buffer)

    def write(self, text):
        if type(text) != types.UnicodeType:
            text = unicode(text, "utf-8")
        self.buffer += text

    # Question and answer
    ##########################################################################

    def center(self, str, height=40):
        if not self.main.config['splitQA']:
            return "<center>" + str + "</center>"
        return '''\
<center><div style="display: table; height: %s%%; width:100%%; overflow: hidden;">\
<div style="display: table-cell; vertical-align: middle;">\
<div style="">%s</div></div></div></center>''' % (height, str)

    def drawQuestion(self, nosound=False):
        "Show the question."
        if not self.main.config['splitQA']:
            self.write("<br>")
        q = self.main.currentCard.htmlQuestion()
        if self.haveTop:
            height = 35
        else:
            height = 45
        self.write(self.center(self.mungeQA(self.main.deck, q), height))
        if self.state != self.oldState and not nosound:
            playFromText(q)

    def drawAnswer(self):
        "Show the answer."
        a = self.main.currentCard.htmlAnswer()
        if self.main.currentCard.cardModel.typeAnswer:
            cor = stripHTML(self.main.currentCard.answer)
            given = unicode(self.main.typeAnswerField.text())
            res = []
            if len(given) < len(cor):
                given += " " * (len(cor) - len(given))
            sz = self.main.currentCard.cardModel.answerFontSize
            ok = "background: %s; color: #000; font-size: %dpx" % (
                passedCharColour, sz)
            bad = "background: %s; color: #000; font-size: %dpx;" % (
                failedCharColour, sz)
            for (i, c) in enumerate(given):
                try:
                    yes = c == cor[i]
                except IndexError:
                    yes = False
                if yes:
                    res.append(
                        "<span style='%s'>%s</span>" % (ok, c))
                else:
                    res.append("<span style='%s'>%s</span>" % (bad, c))
            a = "".join(res) + "<br>" + a
        self.write(self.center('<span id=answer />' +
                               self.mungeQA(self.main.deck, a)))
        if self.state != self.oldState:
            playFromText(a)

    def mungeQA(self, deck, txt):
        txt = mungeQA(deck, txt)
        # hack to fix thai presentation issues
        if self.main.config['addZeroSpace']:
            txt = txt.replace("</span>", "&#8203;</span>")
        return txt

    def onLoadFinished(self):
        if self.state == "showAnswer":
            if self.main.config['scrollToAnswer']:
                mf = self.body.page().mainFrame()
                mf.evaluateJavaScript("location.hash = 'answer'")

    # Top section
    ##########################################################################

    def drawTopSection(self):
        "Show previous card, next scheduled time, and stats."
        self.buffer += "<center>"
        self.drawFutureWarning()
        self.drawLastCard()
        self.buffer += "</center>"

    def drawFutureWarning(self):
        if not self.main.currentCard:
            return
        if self.main.currentCard.due <= time.time():
            return
        if self.main.currentCard.due - time.time() <= self.main.deck.delay0:
            return
        self.write("<span style='color: %s'>" % futureWarningColour +
                   _("This card was due in %s.") % fmtTimeSpan(
            self.main.currentCard.due - time.time()) +
                   "</span>")

    def drawLastCard(self):
        "Show the last card if not the current one, and next time."
        if self.main.lastCard:
            if self.main.config['showLastCardContent']:
                if (self.state == "deckFinished" or
                    self.main.currentCard.id != self.main.lastCard.id):
                    q = self.main.lastCard.question.replace("<br>", "  ")
                    q = stripHTML(q)
                    if len(q) > 50:
                        q = q[:50] + "..."
                    a = self.main.lastCard.answer.replace("<br>", "  ")
                    a = stripHTML(a)
                    if len(a) > 50:
                        a = a[:50] + "..."
                    s = "%s<br>%s" % (q, a)
                    s = stripLatex(s)
                    self.write('<span class="lastCard">%s</span><br>' % s)
            if self.main.config['showLastCardInterval']:
                if self.main.lastQuality > 1:
                    msg = _("Well done! This card will appear again in "
                            "<b>%(next)s</b>.") % \
                            {"next":self.main.lastScheduledTime}
                else:
                    msg = _("This card will appear again later.")
                self.write(msg)
            self.write("<br>")

    # Welcome/empty/finished deck messages
    ##########################################################################

    def drawWelcomeMessage(self):
        self.main.mainWin.welcomeText.setText(_("""
<h1>Welcome to Anki!</h1>
<p>
<table>

<tr>
<td width=50>
<a href="welcome:addfacts"><img src=":/icons/list-add.png"></a>
</td>
<td valign=middle><h1><a href="welcome:addfacts">Add material</a></h1>
Start adding your own material.</td>
</tr>

</table>

<br>
<table>

<tr>
<td>
<a href="welcome:open"><img src=":/icons/document-open.png"></a>
</td>
<td valign=middle><h2><a href="welcome:open">Open Local Deck</a></h2></td>
</tr>

<tr>
<td>
<a href="welcome:openrem"><img src=":/icons/document-open-remote.png"></a>
</td>
<td valign=middle><h2><a href="welcome:openrem">Open Online Deck</a></h2></td>
</tr>

<tr>
<td width=50>
<a href="welcome:sample"><img src=":/icons/anki.png"></a>
</td>
<td valign=middle><h2><a href="welcome:sample">Open Sample Deck</a></h2></td>
</tr>

<tr>
<td width=50>
<a href="welcome:more"><img src=":/icons/khtml_kget.png"></a>
</td>
<td valign=middle><h2><a href="welcome:more">Get More Decks</a></h2></td>
</tr>

</table>"""))

    def drawDeckFinishedMessage(self):
        "Tell the user the deck is finished."
        self.main.mainWin.congratsLabel.setText(
            self.main.deck.deckFinishedMsg())

class AnkiWebView(QWebView):

    def __init__(self, *args):
        QWebView.__init__(self, *args)
        self.setObjectName("mainText")

    def keyPressEvent(self, evt):
        if evt.matches(QKeySequence.Copy):
            self.triggerPageAction(QWebPage.Copy)
            evt.accept()
        evt.ignore()

    def contextMenuEvent(self, evt):
        QWebView.contextMenuEvent(self, evt)

    def dropEvent(self, evt):
        pass