# Copyright (c) 2013 CEF Python, see the Authors file.
# All rights reserved. Licensed under BSD 3-clause license.
# Project website: https://github.com/cztomczak/cefpython

include "cefpython.pyx"

cdef int g_pythonCallbackMaxId = 0
# [callbackId] = (browserId, frameId, func)
cdef dict g_pythonCallbacks = {}

# TODO: send callbackId using CefBinaryNamedValue, see:
# http://www.magpcss.org/ceforum/viewtopic.php?f=6&t=10881

cdef struct PythonCallback:
 int callbackId
 char uniqueCefBinaryValueSize[16]

cdef CefRefPtr[CefBinaryValue] PutPythonCallback(
 object browserId,
 object frameId, 
 object func
 ) except *:
 global g_pythonCallbacks
 global g_pythonCallbackMaxId
 if not browserId:
 raise Exception("PutPythonCallback() FAILED: browserId is empty")
 if not frameId:
 raise Exception("PutPythonCallback() FAILED: frameId is empty")
 cdef PythonCallback pyCallback
 g_pythonCallbackMaxId += 1
 pyCallback.callbackId = g_pythonCallbackMaxId
 cdef CefRefPtr[CefBinaryValue] binaryValue = CefBinaryValue_Create(
 &pyCallback, sizeof(pyCallback))
 g_pythonCallbacks[g_pythonCallbackMaxId] = (browserId, frameId, func)
 return binaryValue

cdef public void RemovePythonCallbacksForFrame(
 object frameId
 ) except * with gil:
 # Cannot remove elements from g_pythonCallbacks (dict) while iterating.
 cdef list toRemove = []
 try:
 global g_pythonCallbacks
 for callbackId, value in g_pythonCallbacks.iteritems():
 if value[1] == frameId:
 toRemove.append(callbackId)
 for callbackId in toRemove:
 del g_pythonCallbacks[callbackId]
 Debug("RemovePythonCallbacksForFrame(): " \
 "removed python callback, callbackId = %s" \
 % callbackId)
 except:
 (exc_type, exc_value, exc_trace) = sys.exc_info()
 sys.excepthook(exc_type, exc_value, exc_trace)

cdef void RemovePythonCallbacksForBrowser(
 int browserId) except *:
 cdef list toRemove = []
 global g_pythonCallbacks
 for callbackId, value in g_pythonCallbacks.iteritems():
 if value[0] == browserId:
 toRemove.append(callbackId)
 for callbackId in toRemove:
 del g_pythonCallbacks[callbackId]
 Debug("RemovePythonCallbacksForBrowser(): " \
 "removed python callback, callbackId = %s" \
 % callbackId)

cdef public cpp_bool ExecutePythonCallback(
 CefRefPtr[CefBrowser] cefBrowser,
 int callbackId, 
 CefRefPtr[CefListValue] cefFuncArgs,
 ) except * with gil:
 cdef object func
 cdef list funcArgs
 cdef object returnValue
 try:
 global g_pythonCallbacks
 if callbackId in g_pythonCallbacks:
 func = g_pythonCallbacks[callbackId][2]
 funcArgs = CefListValueToPyList(
 cefBrowser, cefFuncArgs)
 func(*funcArgs)
 return True
 else:
 Debug("ExecutePythonCallback() FAILED: callback not found, " \
 "callbackId = %s" % callbackId)
 return False
 except:
 (exc_type, exc_value, exc_trace) = sys.exc_info()
 sys.excepthook(exc_type, exc_value, exc_trace)