# -*- coding: utf-8 -*-

#-------------------------------------------------------------------------
# drawElements Quality Program utilities
# --------------------------------------
#
# Copyright 2015 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#-------------------------------------------------------------------------

import os
from egl.common import *
from egl.enums import enumValue
from egl.library import getExtOnlyIface
from khr_util.format import indentLines
from itertools import chain

try:
    from itertools import imap
except ImportError:
    imap=map

def getMangledName (funcName):
    assert funcName[:3] == "egl"
    return "eglw" + funcName[3:]

def commandAliasDefinition (command):
    return "#define\t%s\t%s" % (command.name, getMangledName(command.name))

def commandWrapperDeclaration (command):
    return "%s\t%s\t(%s);" % (
        command.type,
        getMangledName(command.name),
        ", ".join([param.declaration for param in command.params]))

NATIVE_TYPES = [
    "EGLNativeWindowType",
    "EGLNativeDisplayType",
    "EGLNativePixmapType",
]

def commandWrapperDefinition (command):
    template = """
{returnType} {mangledName} ({paramDecls})
{{
    const eglw::Library* egl = eglw::getCurrentThreadLibrary();
    if (!egl)
        return{defaultReturn};
    {maybeReturn}egl->{memberName}({arguments});
}}"""

    arguments = []

    for param in command.params:
        if param.type in NATIVE_TYPES:
            arguments.append("(void*)" + param.name)
        else:
            arguments.append(param.name)

    return template.format(
        returnType = command.type,
        mangledName = "eglw" + command.name[3:],
        paramDecls = commandParams(command),
        defaultReturn = " " + getDefaultReturn(command) if command.type != 'void' else "",
        maybeReturn = "return " if command.type != 'void' else "",
        memberName = getFunctionMemberName(command.name),
        arguments = ", ".join(arguments))

def getDefaultReturn (command):
    if command.name == "glGetError":
        return "GL_INVALID_OPERATION"
    else:
        assert command.type != 'void'
        return "(%s)0" % command.type

commandParams = khr_util.format.commandParams

def enumDefinitionC (enum):
    return "#define %s\t%s" % (enum.name, enumValue(enum))

def gen (registry):
    noExtIface = getInterface(registry, 'egl', VERSION)
    extOnlyIface = getExtOnlyIface(registry, 'egl', EXTENSIONS)
    defaultIface = getDefaultInterface()
    defines = imap(commandAliasDefinition, defaultIface.commands)
    prototypes = imap(commandWrapperDeclaration, defaultIface.commands)
    src = indentLines(chain(defines, prototypes))

    writeInlFile(os.path.join(EGL_WRAPPER_DIR, "eglwApi.inl"), src)
    writeInlFile(os.path.join(EGL_WRAPPER_DIR, "eglwEnumsC.inl"), indentLines(map(enumDefinitionC, defaultIface.enums)))
    genCommandList(noExtIface, commandWrapperDefinition, EGL_WRAPPER_DIR, "eglwImpl.inl")
    genCommandList(extOnlyIface, commandWrapperDefinition, EGL_WRAPPER_DIR, "eglwImplExt.inl")