'''
SAPI 5+ driver.

Copyright (c) 2009 Peter Parente

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
'''
#import comtypes.client
import win32com.client
import pythoncom
import time
import math
import weakref
from ..voice import Voice

# common voices
MSSAM = 'HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Speech\\Voices\\Tokens\\MSSam'
MSMARY = 'HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Speech\\Voices\\Tokens\\MSMary'
MSMIKE = 'HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Speech\\Voices\\Tokens\\MSMike'

# coeffs for wpm conversion
E_REG = {MSSAM : (137.89, 1.11),
         MSMARY : (156.63, 1.11),
         MSMIKE : (154.37, 1.11)}

def buildDriver(proxy):
    return SAPI5Driver(proxy)

class SAPI5Driver(object):
    def __init__(self, proxy):
        self._tts = win32com.client.Dispatch('SAPI.SPVoice')
        #self._tts = comtypes.client.CreateObject('SAPI.SPVoice')
        # all events
        self._tts.EventInterests = 33790
        self._advise = win32com.client.WithEvents(self._tts,
            SAPI5DriverEventSink)
        self._advise.setDriver(weakref.proxy(self))
        #self._debug = comtypes.client.ShowEvents(self._tts)
        #self._advise = comtypes.client.GetEvents(self._tts, self)
        self._proxy = proxy
        self._looping = False
        self._speaking = False
        self._stopping = False
        # initial rate
        self._rateWpm = 200
        self.setProperty('voice', self.getProperty('voice'))
    
    def destroy(self):
        self._tts.EventInterests = 0

    def say(self, text):
        self._proxy.setBusy(True)
        self._proxy.notify('started-utterance')
        self._speaking = True
        self._tts.Speak(unicode(text), 19)
    
    def stop(self):
        if not self._speaking:
            return
        self._proxy.setBusy(True)
        self._stopping = True
        self._tts.Speak('', 3)

    def _toVoice(self, attr):
        return Voice(attr.Id, attr.GetDescription())
    
    def _tokenFromId(self, id):
        tokens = self._tts.GetVoices()
        for token in tokens:
            if token.Id == id: return token
        raise ValueError('unknown voice id %s', id)
    
    def getProperty(self, name):
        if name == 'voices':
            return [self._toVoice(attr) for attr in self._tts.GetVoices()]
        elif name == 'voice':
            return self._tts.Voice.Id
        elif name == 'rate':
            return self._rateWpm
        elif name == 'volume':
            return self._tts.Volume/100.0
        else:
            raise KeyError('unknown property %s' % name)
    
    def setProperty(self, name, value):
        if name == 'voice':
            token = self._tokenFromId(value)
            self._tts.Voice = token
            a, b = E_REG.get(value, E_REG[MSMARY])
            self._tts.Rate = int(math.log(self._rateWpm/a, b))
        elif name == 'rate':
            id = self._tts.Voice.Id
            a, b = E_REG.get(id, E_REG[MSMARY])
            try:
                self._tts.Rate = int(math.log(value/a, b))
            except TypeError, e:
                raise ValueError(str(e))
            self._rateWpm = value
        elif name == 'volume':
            try:
                self._tts.Volume = int(round(value*100, 2))
            except TypeError, e:
                raise ValueError(str(e))
        else:
            raise KeyError('unknown property %s' % name)
    
    def startLoop(self):
        first = True
        self._looping = True
        while self._looping:
            if first: 
                self._proxy.setBusy(False)
                first = False
            pythoncom.PumpWaitingMessages()
            time.sleep(0.05)
    
    def endLoop(self):
        self._looping = False
    
    def iterate(self):
        self._proxy.setBusy(False)
        while 1:
            pythoncom.PumpWaitingMessages()
            yield

class SAPI5DriverEventSink(object):
    def __init__(self):
        self._driver = None

    def setDriver(self, driver):
        self._driver = driver

    def OnWord(self, stream, pos, char, length):
        self._driver._proxy.notify('started-word', location=char, length=length)
    
    def OnEndStream(self, stream, pos):
        d = self._driver
        if d._speaking:
            d._proxy.notify('finished-utterance', completed=not d._stopping)
        d._speaking = False
        d._stopping = False
        d._proxy.setBusy(False)