# $Id$
#
# pjsua Python GUI Demo
#
# Copyright (C)2013 Teluu Inc. (http://www.teluu.com)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
#
import sys
if sys.version_info[0] >= 3: # Python 3
    import tkinter as tk
    from tkinter import ttk
    from tkinter import messagebox as msgbox
else:
    import Tkinter as tk
    import ttk
    import tkMessageBox as msgbox


class TextObserver:
    def onSendMessage(self, msg):
        pass
    def onStartTyping(self):
        pass
    def onStopTyping(self):
        pass

class TextFrame(ttk.Frame):
    def __init__(self, master, observer):
        ttk.Frame.__init__(self, master)
        self._observer = observer
        self._isTyping = False
        self._createWidgets()

    def _onSendMessage(self, event):
        send_text = self._typingBox.get("1.0", tk.END).strip()
        if send_text == '':
            return

        self.addMessage('me: ' + send_text)
        self._typingBox.delete("0.0", tk.END)
        self._onTyping(None)

        # notify app for sending message
        self._observer.onSendMessage(send_text)

    def _onTyping(self, event):
        # notify app for typing indication
        is_typing = self._typingBox.get("1.0", tk.END).strip() != ''
        if is_typing != self._isTyping:
            self._isTyping = is_typing
            if is_typing:
                self._observer.onStartTyping()
            else:
                self._observer.onStopTyping()

    def _createWidgets(self):
        self.rowconfigure(0, weight=1)
        self.rowconfigure(1, weight=0)
        self.rowconfigure(2, weight=0)
        self.columnconfigure(0, weight=1)
        self.columnconfigure(1, weight=0)

        self._text = tk.Text(self, width=50, height=30, font=("Arial", "10"))
        self._text.grid(row=0, column=0, sticky='nswe')
        self._text.config(state=tk.DISABLED)
        self._text.tag_config("info", foreground="darkgray", font=("Arial", "9", "italic"))

        scrl = ttk.Scrollbar(self, orient=tk.VERTICAL, command=self._text.yview)
        self._text.config(yscrollcommand=scrl.set)
        scrl.grid(row=0, column=1, sticky='nsw')

        self._typingBox = tk.Text(self, width=50, height=1, font=("Arial", "10"))
        self._typingBox.grid(row=1, columnspan=2, sticky='we', pady=0)

        self._statusBar = tk.Label(self, anchor='w', font=("Arial", "8", "italic"))
        self._statusBar.grid(row=2, columnspan=2, sticky='we')

        self._typingBox.bind('<Return>', self._onSendMessage)
        self._typingBox.bind("<Key>", self._onTyping)
        self._typingBox.focus_set()

    def addMessage(self, msg, is_chat = True):
        self._text.config(state=tk.NORMAL)
        if is_chat:
            self._text.insert(tk.END, msg+'\r\n')
        else:
            self._text.insert(tk.END, msg+'\r\n', 'info')
        self._text.config(state=tk.DISABLED)
        self._text.yview(tk.END)

    def setTypingIndication(self, who, is_typing):
        if is_typing:
            self._statusBar['text'] = "'%s' is typing.." % (who)
        else:
            self._statusBar['text'] = ''

class AudioState:
    NULL, INITIALIZING, CONNECTED, DISCONNECTED, FAILED = range(5)

class AudioObserver:
    def onHangup(self, peer_uri):
        pass
    def onHold(self, peer_uri):
        pass
    def onUnhold(self, peer_uri):
        pass
    def onRxMute(self, peer_uri, is_muted):
        pass
    def onRxVol(self, peer_uri, vol_pct):
        pass
    def onTxMute(self, peer_uri, is_muted):
        pass


class AudioFrame(ttk.Labelframe):
    def __init__(self, master, peer_uri, observer):
        ttk.Labelframe.__init__(self, master, text=peer_uri)
        self.peerUri = peer_uri
        self._observer = observer
        self._initFrame = None
        self._callFrame = None
        self._rxMute = False
        self._txMute = False
        self._state = AudioState.NULL

        self._createInitWidgets()
        self._createWidgets()

    def updateState(self, state):
        if self._state == state:
            return

        if state == AudioState.INITIALIZING:
            self._callFrame.pack_forget()
            self._initFrame.pack(fill=tk.BOTH)
            self._btnCancel.pack(side=tk.TOP)
            self._lblInitState['text'] = 'Intializing..'

        elif state == AudioState.CONNECTED:
            self._initFrame.pack_forget()
            self._callFrame.pack(fill=tk.BOTH)
        else:
            self._callFrame.pack_forget()
            self._initFrame.pack(fill=tk.BOTH)
            if state == AudioState.FAILED:
                self._lblInitState['text'] = 'Failed'
            else:
                self._lblInitState['text'] = 'Normal cleared'
                self._btnCancel.pack_forget()

            self._btnHold['text'] = 'Hold'
            self._btnHold.config(state=tk.NORMAL)
            self._rxMute = False
            self._txMute = False
            self.btnRxMute['text'] = 'Mute'
            self.btnTxMute['text'] = 'Mute'
            self.rxVol.set(5.0)

        # save last state
        self._state = state

    def setStatsText(self, stats_str):
        self.stat.config(state=tk.NORMAL)
        self.stat.delete("0.0", tk.END)
        self.stat.insert(tk.END, stats_str)
        self.stat.config(state=tk.DISABLED)

    def _onHold(self):
        self._btnHold.config(state=tk.DISABLED)
        # notify app
        if self._btnHold['text'] == 'Hold':
            self._observer.onHold(self.peerUri)
            self._btnHold['text'] = 'Unhold'
        else:
            self._observer.onUnhold(self.peerUri)
            self._btnHold['text'] = 'Hold'
        self._btnHold.config(state=tk.NORMAL)

    def _onHangup(self):
        # notify app
        self._observer.onHangup(self.peerUri)

    def _onRxMute(self):
        # notify app
        self._rxMute = not self._rxMute
        self._observer.onRxMute(self.peerUri, self._rxMute)
        self.btnRxMute['text'] = 'Unmute' if self._rxMute else 'Mute'

    def _onRxVol(self, event):
        # notify app
        vol = self.rxVol.get()
        self._observer.onRxVol(self.peerUri, vol*10.0)

    def _onTxMute(self):
        # notify app
        self._txMute = not self._txMute
        self._observer.onTxMute(self.peerUri, self._txMute)
        self.btnTxMute['text'] = 'Unmute' if self._txMute else 'Mute'

    def _createInitWidgets(self):
        self._initFrame = ttk.Frame(self)
        #self._initFrame.pack(fill=tk.BOTH)


        self._lblInitState = tk.Label(self._initFrame, font=("Arial", "12"), text='')
        self._lblInitState.pack(side=tk.TOP, fill=tk.X, expand=1)

        # Operation: cancel/kick
        self._btnCancel = ttk.Button(self._initFrame, text = 'Cancel', command=self._onHangup)
        self._btnCancel.pack(side=tk.TOP)

    def _createWidgets(self):
        self._callFrame = ttk.Frame(self)
        #self._callFrame.pack(fill=tk.BOTH)

        # toolbar
        toolbar = ttk.Frame(self._callFrame)
        toolbar.pack(side=tk.TOP, fill=tk.X)
        self._btnHold = ttk.Button(toolbar, text='Hold', command=self._onHold)
        self._btnHold.pack(side=tk.LEFT, fill=tk.Y)
        #self._btnXfer = ttk.Button(toolbar, text='Transfer..')
        #self._btnXfer.pack(side=tk.LEFT, fill=tk.Y)
        self._btnHangUp = ttk.Button(toolbar, text='Hangup', command=self._onHangup)
        self._btnHangUp.pack(side=tk.LEFT, fill=tk.Y)

        # volume tool
        vol_frm = ttk.Frame(self._callFrame)
        vol_frm.pack(side=tk.TOP, fill=tk.X)

        self.rxVolFrm = ttk.Labelframe(vol_frm, text='RX volume')
        self.rxVolFrm.pack(side=tk.LEFT, fill=tk.Y)

        self.btnRxMute = ttk.Button(self.rxVolFrm, width=8, text='Mute', command=self._onRxMute)
        self.btnRxMute.pack(side=tk.LEFT)
        self.rxVol = tk.Scale(self.rxVolFrm, orient=tk.HORIZONTAL, from_=0.0, to=10.0, showvalue=1) #, tickinterval=10.0, showvalue=1)
        self.rxVol.set(5.0)
        self.rxVol.bind("<ButtonRelease-1>", self._onRxVol)
        self.rxVol.pack(side=tk.LEFT)

        self.txVolFrm = ttk.Labelframe(vol_frm, text='TX volume')
        self.txVolFrm.pack(side=tk.RIGHT, fill=tk.Y)

        self.btnTxMute = ttk.Button(self.txVolFrm, width=8, text='Mute', command=self._onTxMute)
        self.btnTxMute.pack(side=tk.LEFT)

        # stat
        self.stat = tk.Text(self._callFrame, width=10, height=2, bg='lightgray', relief=tk.FLAT, font=("Courier", "9"))
        self.stat.insert(tk.END, 'stat here')
        self.stat.pack(side=tk.BOTTOM, fill=tk.BOTH, expand=1)


class ChatObserver(TextObserver, AudioObserver):
    def onAddParticipant(self):
        pass
    def onStartAudio(self):
        pass
    def onStopAudio(self):
        pass
    def onCloseWindow(self):
        pass

class ChatFrame(tk.Toplevel):
    """
    Room
    """
    def __init__(self, observer):
        tk.Toplevel.__init__(self)
        self.protocol("WM_DELETE_WINDOW", self._onClose)
        self._observer = observer

        self._text = None
        self._text_shown = True

        self._audioEnabled = False
        self._audioFrames = []
        self._createWidgets()

    def _createWidgets(self):
        # toolbar
        self.toolbar = ttk.Frame(self)
        self.toolbar.pack(side=tk.TOP, fill=tk.BOTH)

        btnText = ttk.Button(self.toolbar, text='Show/hide text', command=self._onShowHideText)
        btnText.pack(side=tk.LEFT, fill=tk.Y)
        btnAudio = ttk.Button(self.toolbar, text='Start/stop audio', command=self._onStartStopAudio)
        btnAudio.pack(side=tk.LEFT, fill=tk.Y)

        ttk.Separator(self.toolbar, orient=tk.VERTICAL).pack(side=tk.LEFT, fill=tk.Y, padx = 4)

        btnAdd = ttk.Button(self.toolbar, text='Add participant..', command=self._onAddParticipant)
        btnAdd.pack(side=tk.LEFT, fill=tk.Y)

        # media frame
        self.media = ttk.Frame(self)
        self.media.pack(side=tk.BOTTOM, fill=tk.BOTH, expand=1)

        # create Text Chat frame
        self.media_left = ttk.Frame(self.media)
        self._text = TextFrame(self.media_left, self._observer)
        self._text.pack(fill=tk.BOTH, expand=1)
        self.media_left.pack(side=tk.LEFT, fill=tk.BOTH, expand=1)

        # create other media frame
        self.media_right = ttk.Frame(self.media)

    def _arrangeMediaFrames(self):
        if len(self._audioFrames) == 0:
            self.media_right.pack_forget()
            return

        self.media_right.pack(side=tk.RIGHT, fill=tk.BOTH, expand=1)
        MAX_ROWS = 3
        row_num = 0
        col_num = 1
        for frm in self._audioFrames:
            frm.grid(row=row_num, column=col_num, sticky='nsew', padx=5, pady=5)
            row_num += 1
            if row_num >= MAX_ROWS:
                row_num  = 0
                col_num += 1

    def _onShowHideText(self):
        self.textShowHide(not self._text_shown)

    def _onAddParticipant(self):
        self._observer.onAddParticipant()

    def _onStartStopAudio(self):
        self._audioEnabled = not self._audioEnabled
        if self._audioEnabled:
            self._observer.onStartAudio()
        else:
            self._observer.onStopAudio()
        self.enableAudio(self._audioEnabled)

    def _onClose(self):
        self._observer.onCloseWindow()

    # APIs

    def bringToFront(self):
        self.deiconify()
        self.lift()
        self._text._typingBox.focus_set()

    def textAddMessage(self, msg, is_chat = True):
        self._text.addMessage(msg, is_chat)

    def textSetTypingIndication(self, who, is_typing = True):
        self._text.setTypingIndication(who, is_typing)

    def addParticipant(self, participant_uri):
        aud_frm = AudioFrame(self.media_right, participant_uri, self._observer)
        self._audioFrames.append(aud_frm)

    def delParticipant(self, participant_uri):
        for aud_frm in self._audioFrames:
            if participant_uri == aud_frm.peerUri:
                self._audioFrames.remove(aud_frm)
                # need to delete aud_frm manually?
                aud_frm.destroy()
                return

    def textShowHide(self, show = True):
        if show:
            self.media_left.pack(side=tk.LEFT, fill=tk.BOTH, expand=1)
            self._text._typingBox.focus_set()
        else:
            self.media_left.pack_forget()
        self._text_shown = show

    def enableAudio(self, is_enabled = True):
        if is_enabled:
            self._arrangeMediaFrames()
        else:
            self.media_right.pack_forget()
        self._audioEnabled = is_enabled

    def audioUpdateState(self, participant_uri, state):
        for aud_frm in self._audioFrames:
            if participant_uri == aud_frm.peerUri:
                aud_frm.updateState(state)
                break
        if state >= AudioState.DISCONNECTED and len(self._audioFrames) == 1:
            self.enableAudio(False)
        else:
            self.enableAudio(True)

    def audioSetStatsText(self, participant_uri, stats_str):
        for aud_frm in self._audioFrames:
            if participant_uri == aud_frm.peerUri:
                aud_frm.setStatsText(stats_str)
                break

if __name__ == '__main__':
    root = tk.Tk()
    root.title("Chat")
    root.columnconfigure(0, weight=1)
    root.rowconfigure(0, weight=1)

    obs = ChatObserver()
    dlg = ChatFrame(obs)
    #dlg = TextFrame(root)
    #dlg = AudioFrame(root)

    #dlg.pack(fill=tk.BOTH, expand=1)
    root.mainloop()