#!/usr/bin/python3 -i
#
# Copyright (c) 2015-2017 The Khronos Group Inc.
# Copyright (c) 2015-2017 Valve Corporation
# Copyright (c) 2015-2017 LunarG, Inc.
# Copyright (c) 2015-2017 Google Inc.
#
# 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.
#
# Author: Mark Lobodzinski <mark@lunarg.com>
# Author: Tobin Ehlis <tobine@google.com>
# Author: John Zulauf <jzulauf@lunarg.com>

import os,re,sys
import xml.etree.ElementTree as etree
from generator import *
from collections import namedtuple
from common_codegen import *

#
# HelperFileOutputGeneratorOptions - subclass of GeneratorOptions.
class HelperFileOutputGeneratorOptions(GeneratorOptions):
    def __init__(self,
                 conventions = None,
                 filename = None,
                 directory = '.',
                 apiname = None,
                 profile = None,
                 versions = '.*',
                 emitversions = '.*',
                 defaultExtensions = None,
                 addExtensions = None,
                 removeExtensions = None,
                 emitExtensions = None,
                 sortProcedure = regSortFeatures,
                 prefixText = "",
                 genFuncPointers = True,
                 protectFile = True,
                 protectFeature = True,
                 apicall = '',
                 apientry = '',
                 apientryp = '',
                 alignFuncParam = 0,
                 library_name = '',
                 expandEnumerants = True,
                 helper_file_type = ''):
        GeneratorOptions.__init__(self, conventions, filename, directory, apiname, profile,
                                  versions, emitversions, defaultExtensions,
                                  addExtensions, removeExtensions, emitExtensions, sortProcedure)
        self.prefixText       = prefixText
        self.genFuncPointers  = genFuncPointers
        self.protectFile      = protectFile
        self.protectFeature   = protectFeature
        self.apicall          = apicall
        self.apientry         = apientry
        self.apientryp        = apientryp
        self.alignFuncParam   = alignFuncParam
        self.library_name     = library_name
        self.helper_file_type = helper_file_type
#
# HelperFileOutputGenerator - subclass of OutputGenerator. Outputs Vulkan helper files
class HelperFileOutputGenerator(OutputGenerator):
    """Generate helper file based on XML element attributes"""
    def __init__(self,
                 errFile = sys.stderr,
                 warnFile = sys.stderr,
                 diagFile = sys.stdout):
        OutputGenerator.__init__(self, errFile, warnFile, diagFile)
        # Internal state - accumulators for different inner block text
        self.enum_output = ''                             # string built up of enum string routines
        # Internal state - accumulators for different inner block text
        self.structNames = []                             # List of Vulkan struct typenames
        self.structTypes = dict()                         # Map of Vulkan struct typename to required VkStructureType
        self.structMembers = []                           # List of StructMemberData records for all Vulkan structs
        self.object_types = []                            # List of all handle types
        self.object_type_aliases = []                     # Aliases to handles types (for handles that were extensions)
        self.debug_report_object_types = []               # Handy copy of debug_report_object_type enum data
        self.core_object_types = []                       # Handy copy of core_object_type enum data
        self.device_extension_info = dict()               # Dict of device extension name defines and ifdef values
        self.instance_extension_info = dict()             # Dict of instance extension name defines and ifdef values

        # Named tuples to store struct and command data
        self.StructType = namedtuple('StructType', ['name', 'value'])
        self.CommandParam = namedtuple('CommandParam', ['type', 'name', 'ispointer', 'isstaticarray', 'isconst', 'iscount', 'len', 'extstructs', 'cdecl'])
        self.StructMemberData = namedtuple('StructMemberData', ['name', 'members', 'ifdef_protect'])

        self.custom_construct_params = {
            # safe_VkGraphicsPipelineCreateInfo needs to know if subpass has color and\or depth\stencil attachments to use its pointers
            'VkGraphicsPipelineCreateInfo' :
                ', const bool uses_color_attachment, const bool uses_depthstencil_attachment',
            # safe_VkPipelineViewportStateCreateInfo needs to know if viewport and scissor is dynamic to use its pointers
            'VkPipelineViewportStateCreateInfo' :
                ', const bool is_dynamic_viewports, const bool is_dynamic_scissors',
        }
    #
    # Called once at the beginning of each run
    def beginFile(self, genOpts):
        OutputGenerator.beginFile(self, genOpts)
        # User-supplied prefix text, if any (list of strings)
        self.helper_file_type = genOpts.helper_file_type
        self.library_name = genOpts.library_name
        # File Comment
        file_comment = '// *** THIS FILE IS GENERATED - DO NOT EDIT ***\n'
        file_comment += '// See helper_file_generator.py for modifications\n'
        write(file_comment, file=self.outFile)
        # Copyright Notice
        copyright = ''
        copyright += '\n'
        copyright += '/***************************************************************************\n'
        copyright += ' *\n'
        copyright += ' * Copyright (c) 2015-2017 The Khronos Group Inc.\n'
        copyright += ' * Copyright (c) 2015-2017 Valve Corporation\n'
        copyright += ' * Copyright (c) 2015-2017 LunarG, Inc.\n'
        copyright += ' * Copyright (c) 2015-2017 Google Inc.\n'
        copyright += ' *\n'
        copyright += ' * Licensed under the Apache License, Version 2.0 (the "License");\n'
        copyright += ' * you may not use this file except in compliance with the License.\n'
        copyright += ' * You may obtain a copy of the License at\n'
        copyright += ' *\n'
        copyright += ' *     http://www.apache.org/licenses/LICENSE-2.0\n'
        copyright += ' *\n'
        copyright += ' * Unless required by applicable law or agreed to in writing, software\n'
        copyright += ' * distributed under the License is distributed on an "AS IS" BASIS,\n'
        copyright += ' * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n'
        copyright += ' * See the License for the specific language governing permissions and\n'
        copyright += ' * limitations under the License.\n'
        copyright += ' *\n'
        copyright += ' * Author: Mark Lobodzinski <mark@lunarg.com>\n'
        copyright += ' * Author: Courtney Goeltzenleuchter <courtneygo@google.com>\n'
        copyright += ' * Author: Tobin Ehlis <tobine@google.com>\n'
        copyright += ' * Author: Chris Forbes <chrisforbes@google.com>\n'
        copyright += ' * Author: John Zulauf<jzulauf@lunarg.com>\n'
        copyright += ' *\n'
        copyright += ' ****************************************************************************/\n'
        write(copyright, file=self.outFile)
    #
    # Write generated file content to output file
    def endFile(self):
        dest_file = ''
        dest_file += self.OutputDestFile()
        # Remove blank lines at EOF
        if dest_file.endswith('\n'):
            dest_file = dest_file[:-1]
        write(dest_file, file=self.outFile);
        # Finish processing in superclass
        OutputGenerator.endFile(self)
    #
    # Override parent class to be notified of the beginning of an extension
    def beginFeature(self, interface, emit):
        # Start processing in superclass
        OutputGenerator.beginFeature(self, interface, emit)
        self.featureExtraProtect = GetFeatureProtect(interface)

        if interface.tag != 'extension':
            return
        name = self.featureName
        nameElem = interface[0][1]
        name_define = nameElem.get('name')
        if 'EXTENSION_NAME' not in name_define:
            print("Error in vk.xml file -- extension name is not available")
        requires = interface.get('requires')
        if requires is not None:
            required_extensions = requires.split(',')
        else:
            required_extensions = list()
        info = { 'define': name_define, 'ifdef':self.featureExtraProtect, 'reqs':required_extensions }
        if interface.get('type') == 'instance':
            self.instance_extension_info[name] = info
        else:
            self.device_extension_info[name] = info

    #
    # Override parent class to be notified of the end of an extension
    def endFeature(self):
        # Finish processing in superclass
        OutputGenerator.endFeature(self)
    #
    # Grab group (e.g. C "enum" type) info to output for enum-string conversion helper
    def genGroup(self, groupinfo, groupName, alias):
        OutputGenerator.genGroup(self, groupinfo, groupName, alias)
        groupElem = groupinfo.elem
        # For enum_string_header
        if self.helper_file_type == 'enum_string_header':
            value_set = set()
            for elem in groupElem.findall('enum'):
                if elem.get('supported') != 'disabled' and elem.get('alias') is None:
                    value_set.add(elem.get('name'))
            self.enum_output += self.GenerateEnumStringConversion(groupName, value_set)
        elif self.helper_file_type == 'object_types_header':
            if groupName == 'VkDebugReportObjectTypeEXT':
                for elem in groupElem.findall('enum'):
                    if elem.get('supported') != 'disabled':
                        item_name = elem.get('name')
                        self.debug_report_object_types.append(item_name)
            elif groupName == 'VkObjectType':
                for elem in groupElem.findall('enum'):
                    if elem.get('supported') != 'disabled':
                        item_name = elem.get('name')
                        self.core_object_types.append(item_name)

    #
    # Called for each type -- if the type is a struct/union, grab the metadata
    def genType(self, typeinfo, name, alias):
        OutputGenerator.genType(self, typeinfo, name, alias)
        typeElem = typeinfo.elem
        # If the type is a struct type, traverse the imbedded <member> tags generating a structure.
        # Otherwise, emit the tag text.
        category = typeElem.get('category')
        if category == 'handle':
            if alias:
                self.object_type_aliases.append((name,alias))
            else:
                self.object_types.append(name)
        elif (category == 'struct' or category == 'union'):
            self.structNames.append(name)
            self.genStruct(typeinfo, name, alias)
    #
    # Generate a VkStructureType based on a structure typename
    def genVkStructureType(self, typename):
        # Add underscore between lowercase then uppercase
        value = re.sub('([a-z0-9])([A-Z])', r'\1_\2', typename)
        # Change to uppercase
        value = value.upper()
        # Add STRUCTURE_TYPE_
        return re.sub('VK_', 'VK_STRUCTURE_TYPE_', value)
    #
    # Check if the parameter passed in is a pointer
    def paramIsPointer(self, param):
        ispointer = False
        for elem in param:
            if ((elem.tag is not 'type') and (elem.tail is not None)) and '*' in elem.tail:
                ispointer = True
        return ispointer
    #
    # Check if the parameter passed in is a static array
    def paramIsStaticArray(self, param):
        isstaticarray = 0
        paramname = param.find('name')
        if (paramname.tail is not None) and ('[' in paramname.tail):
            isstaticarray = paramname.tail.count('[')
        return isstaticarray
    #
    # Retrieve the type and name for a parameter
    def getTypeNameTuple(self, param):
        type = ''
        name = ''
        for elem in param:
            if elem.tag == 'type':
                type = noneStr(elem.text)
            elif elem.tag == 'name':
                name = noneStr(elem.text)
        return (type, name)
    # Extract length values from latexmath.  Currently an inflexible solution that looks for specific
    # patterns that are found in vk.xml.  Will need to be updated when new patterns are introduced.
    def parseLateXMath(self, source):
        name = 'ERROR'
        decoratedName = 'ERROR'
        if 'mathit' in source:
            # Matches expressions similar to 'latexmath:[\lceil{\mathit{rasterizationSamples} \over 32}\rceil]'
            match = re.match(r'latexmath\s*\:\s*\[\s*\\l(\w+)\s*\{\s*\\mathit\s*\{\s*(\w+)\s*\}\s*\\over\s*(\d+)\s*\}\s*\\r(\w+)\s*\]', source)
            if not match or match.group(1) != match.group(4):
                raise 'Unrecognized latexmath expression'
            name = match.group(2)
            # Need to add 1 for ceiling function; otherwise, the allocated packet
            # size will be less than needed during capture for some title which use
            # this in VkPipelineMultisampleStateCreateInfo. based on ceiling function
            # definition,it is '{0}%{1}?{0}/{1} + 1:{0}/{1}'.format(*match.group(2, 3)),
            # its value <= '{}/{} + 1'.
            if match.group(1) == 'ceil':
                decoratedName = '{}/{} + 1'.format(*match.group(2, 3))
            else:
                decoratedName = '{}/{}'.format(*match.group(2, 3))
        else:
            # Matches expressions similar to 'latexmath : [dataSize \over 4]'
            match = re.match(r'latexmath\s*\:\s*\[\s*(\\textrm\{)?(\w+)\}?\s*\\over\s*(\d+)\s*\]', source)
            name = match.group(2)
            decoratedName = '{}/{}'.format(*match.group(2, 3))
        return name, decoratedName
    #
    # Retrieve the value of the len tag
    def getLen(self, param):
        result = None
        len = param.attrib.get('len')
        if len and len != 'null-terminated':
            # For string arrays, 'len' can look like 'count,null-terminated', indicating that we
            # have a null terminated array of strings.  We strip the null-terminated from the
            # 'len' field and only return the parameter specifying the string count
            if 'null-terminated' in len:
                result = len.split(',')[0]
            else:
                result = len
            if 'latexmath' in len:
                param_type, param_name = self.getTypeNameTuple(param)
                len_name, result = self.parseLateXMath(len)
            # Spec has now notation for len attributes, using :: instead of platform specific pointer symbol
            result = str(result).replace('::', '->')
        return result
    #
    # Check if a structure is or contains a dispatchable (dispatchable = True) or
    # non-dispatchable (dispatchable = False) handle
    def TypeContainsObjectHandle(self, handle_type, dispatchable):
        if dispatchable:
            type_key = 'VK_DEFINE_HANDLE'
        else:
            type_key = 'VK_DEFINE_NON_DISPATCHABLE_HANDLE'
        handle = self.registry.tree.find("types/type/[name='" + handle_type + "'][@category='handle']")
        if handle is not None and handle.find('type').text == type_key:
            return True
        # if handle_type is a struct, search its members
        if handle_type in self.structNames:
            member_index = next((i for i, v in enumerate(self.structMembers) if v[0] == handle_type), None)
            if member_index is not None:
                for item in self.structMembers[member_index].members:
                    handle = self.registry.tree.find("types/type/[name='" + item.type + "'][@category='handle']")
                    if handle is not None and handle.find('type').text == type_key:
                        return True
        return False
    #
    # Generate local ready-access data describing Vulkan structures and unions from the XML metadata
    def genStruct(self, typeinfo, typeName, alias):
        OutputGenerator.genStruct(self, typeinfo, typeName, alias)
        members = typeinfo.elem.findall('.//member')
        # Iterate over members once to get length parameters for arrays
        lens = set()
        for member in members:
            len = self.getLen(member)
            if len:
                lens.add(len)
        # Generate member info
        membersInfo = []
        for member in members:
            # Get the member's type and name
            info = self.getTypeNameTuple(member)
            type = info[0]
            name = info[1]
            cdecl = self.makeCParamDecl(member, 1)
            # Process VkStructureType
            if type == 'VkStructureType':
                # Extract the required struct type value from the comments
                # embedded in the original text defining the 'typeinfo' element
                rawXml = etree.tostring(typeinfo.elem).decode('ascii')
                result = re.search(r'VK_STRUCTURE_TYPE_\w+', rawXml)
                if result:
                    value = result.group(0)
                else:
                    value = self.genVkStructureType(typeName)
                # Store the required type value
                self.structTypes[typeName] = self.StructType(name=name, value=value)
            # Store pointer/array/string info
            isstaticarray = self.paramIsStaticArray(member)
            membersInfo.append(self.CommandParam(type=type,
                                                 name=name,
                                                 ispointer=self.paramIsPointer(member),
                                                 isstaticarray=isstaticarray,
                                                 isconst=True if 'const' in cdecl else False,
                                                 iscount=True if name in lens else False,
                                                 len=self.getLen(member),
                                                 extstructs=self.registry.validextensionstructs[typeName] if name == 'pNext' else None,
                                                 cdecl=cdecl))
        self.structMembers.append(self.StructMemberData(name=typeName, members=membersInfo, ifdef_protect=self.featureExtraProtect))
    #
    # Enum_string_header: Create a routine to convert an enumerated value into a string
    def GenerateEnumStringConversion(self, groupName, value_list):
        outstring = '\n'
        outstring += 'static inline const char* string_%s(%s input_value)\n' % (groupName, groupName)
        outstring += '{\n'
        outstring += '    switch ((%s)input_value)\n' % groupName
        outstring += '    {\n'
        for item in value_list:
            outstring += '        case %s:\n' % item
            outstring += '            return "%s";\n' % item
        outstring += '        default:\n'
        outstring += '            return "Unhandled %s";\n' % groupName
        outstring += '    }\n'
        outstring += '}\n'
        return outstring
    #
    # Combine object types helper header file preamble with body text and return
    def GenerateObjectTypesHelperHeader(self):
        object_types_helper_header = '\n'
        object_types_helper_header += '#pragma once\n'
        object_types_helper_header += '\n'
        object_types_helper_header += '#include <vulkan/vulkan.h>\n\n'
        object_types_helper_header += self.GenerateObjectTypesHeader()
        return object_types_helper_header
    #
    # Object types header: create object enum type header file
    def GenerateObjectTypesHeader(self):
        object_types_header = ''
        object_types_header += '// Object Type enum for validation layer internal object handling\n'
        object_types_header += 'typedef enum VulkanObjectType {\n'
        object_types_header += '    kVulkanObjectTypeUnknown = 0,\n'
        enum_num = 1
        type_list = [];
        enum_entry_map = {}

        # Output enum definition as each handle is processed, saving the names to use for the conversion routine
        for item in self.object_types:
            fixup_name = item[2:]
            enum_entry = 'kVulkanObjectType%s' % fixup_name
            enum_entry_map[item] = enum_entry
            object_types_header += '    ' + enum_entry
            object_types_header += ' = %d,\n' % enum_num
            enum_num += 1
            type_list.append(enum_entry)
        object_types_header += '    kVulkanObjectTypeMax = %d,\n' % enum_num
        object_types_header += '    // Aliases for backwards compatibilty of "promoted" types\n'
        for (name, alias) in self.object_type_aliases:
            fixup_name = name[2:]
            object_types_header += '    kVulkanObjectType{} = {},\n'.format(fixup_name, enum_entry_map[alias])
        object_types_header += '} VulkanObjectType;\n\n'

        # Output name string helper
        object_types_header += '// Array of object name strings for OBJECT_TYPE enum conversion\n'
        object_types_header += 'static const char * const object_string[kVulkanObjectTypeMax] = {\n'
        object_types_header += '    "Unknown",\n'
        for item in self.object_types:
            fixup_name = item[2:]
            object_types_header += '    "%s",\n' % fixup_name
        object_types_header += '};\n'

        # Key creation helper for map comprehensions that convert between k<Name> and VK<Name> symbols
        def to_key(regex, raw_key): return re.search(regex, raw_key).group(1).lower().replace("_","")

        # Output a conversion routine from the layer object definitions to the debug report definitions
        # As the VK_DEBUG_REPORT types are not being updated, specify UNKNOWN for unmatched types
        object_types_header += '\n'
        object_types_header += '// Helper array to get Vulkan VK_EXT_debug_report object type enum from the internal layers version\n'
        object_types_header += 'const VkDebugReportObjectTypeEXT get_debug_report_enum[] = {\n'
        object_types_header += '    VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT, // kVulkanObjectTypeUnknown\n'

        dbg_re = '^VK_DEBUG_REPORT_OBJECT_TYPE_(.*)_EXT$'
        dbg_map = {to_key(dbg_re, dbg) : dbg for dbg in self.debug_report_object_types}
        dbg_default = 'VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT'
        for object_type in type_list:
            vk_object_type = dbg_map.get(object_type.replace("kVulkanObjectType", "").lower(), dbg_default)
            object_types_header += '    %s,   // %s\n' % (vk_object_type, object_type)
        object_types_header += '};\n'

        # Output a conversion routine from the layer object definitions to the core object type definitions
        # This will intentionally *fail* for unmatched types as the VK_OBJECT_TYPE list should match the kVulkanObjectType list
        object_types_header += '\n'
        object_types_header += '// Helper array to get Official Vulkan VkObjectType enum from the internal layers version\n'
        object_types_header += 'const VkObjectType get_object_type_enum[] = {\n'
        object_types_header += '    VK_OBJECT_TYPE_UNKNOWN, // kVulkanObjectTypeUnknown\n'

        vko_re = '^VK_OBJECT_TYPE_(.*)'
        vko_map = {to_key(vko_re, vko) : vko for vko in self.core_object_types}
        for object_type in type_list:
            vk_object_type = vko_map[object_type.replace("kVulkanObjectType", "").lower()]
            object_types_header += '    %s,   // %s\n' % (vk_object_type, object_type)
        object_types_header += '};\n'

        # Create a function to convert from VkDebugReportObjectTypeEXT to VkObjectType
        object_types_header += '\n'
        object_types_header += '// Helper function to convert from VkDebugReportObjectTypeEXT to VkObjectType\n'
        object_types_header += 'static inline VkObjectType convertDebugReportObjectToCoreObject(VkDebugReportObjectTypeEXT debug_report_obj){\n'
        object_types_header += '    if (debug_report_obj == VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT) {\n'
        object_types_header += '        return VK_OBJECT_TYPE_UNKNOWN;\n'
        for core_object_type in self.core_object_types:
            core_target_type = core_object_type.replace("VK_OBJECT_TYPE_", "").lower()
            core_target_type = core_target_type.replace("_", "")
            for dr_object_type in self.debug_report_object_types:
                dr_target_type = dr_object_type.replace("VK_DEBUG_REPORT_OBJECT_TYPE_", "").lower()
                dr_target_type = dr_target_type[:-4]
                dr_target_type = dr_target_type.replace("_", "")
                if core_target_type == dr_target_type:
                    object_types_header += '    } else if (debug_report_obj == %s) {\n' % dr_object_type
                    object_types_header += '        return %s;\n' % core_object_type
                    break
        object_types_header += '    }\n'
        object_types_header += '    return VK_OBJECT_TYPE_UNKNOWN;\n'
        object_types_header += '}\n'

        # Create a function to convert from VkObjectType to VkDebugReportObjectTypeEXT
        object_types_header += '\n'
        object_types_header += '// Helper function to convert from VkDebugReportObjectTypeEXT to VkObjectType\n'
        object_types_header += 'static inline VkDebugReportObjectTypeEXT convertCoreObjectToDebugReportObject(VkObjectType core_report_obj){\n'
        object_types_header += '    if (core_report_obj == VK_OBJECT_TYPE_UNKNOWN) {\n'
        object_types_header += '        return VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT;\n'
        for core_object_type in self.core_object_types:
            core_target_type = core_object_type.replace("VK_OBJECT_TYPE_", "").lower()
            core_target_type = core_target_type.replace("_", "")
            for dr_object_type in self.debug_report_object_types:
                dr_target_type = dr_object_type.replace("VK_DEBUG_REPORT_OBJECT_TYPE_", "").lower()
                dr_target_type = dr_target_type[:-4]
                dr_target_type = dr_target_type.replace("_", "")
                if core_target_type == dr_target_type:
                    object_types_header += '    } else if (core_report_obj == %s) {\n' % core_object_type
                    object_types_header += '        return %s;\n' % dr_object_type
                    break
        object_types_header += '    }\n'
        object_types_header += '    return VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT;\n'
        object_types_header += '}\n'
        return object_types_header

    #
    # Create a helper file and return it as a string
    def OutputDestFile(self):
        if self.helper_file_type == 'object_types_header':
            return self.GenerateObjectTypesHelperHeader()
        else:
            return 'Bad Helper File Generator Option %s' % self.helper_file_type
