#!/usr/bin/python3 -i
#
# Copyright (c) 2013-2019 The Khronos Group 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.

import re

from generator import OutputGenerator, write
from jinja_helpers import JinjaTemplate, make_jinja_environment
from spec_tools.util import getElemName, getElemType


class CStruct:
    """Represents a OpenXR struct type"""

    def __init__(self, typeName, structTypeName, members, protect):
        self.typeName = typeName
        self.members = members
        self.structTypeName = structTypeName
        self.protect = protect


class CBitmask:
    """Represents a OpenXR mask type"""

    def __init__(self, typeName, maskTuples):
        self.typeName = typeName
        self.maskTuples = maskTuples


class CEnum:
    """Represents a OpenXR group enum type"""

    def __init__(self, typeName, typeNamePrefix, typeNameSuffix, enumTuples):
        self.typeName = typeName
        self.typeNamePrefix = typeNamePrefix
        self.typeNameSuffix = typeNameSuffix
        self.enumTuples = enumTuples


class CReflectionOutputGenerator(OutputGenerator):
    """Generate specified API interfaces in a specific style, such as a C header"""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.env = make_jinja_environment(file_with_templates_as_sibs=__file__)
        self.structs = []
        self.enums = []
        self.bitmasks = []

    def beginFile(self, genOpts):
        OutputGenerator.beginFile(self, genOpts)
        self.template = JinjaTemplate(self.env, "template_{}".format(genOpts.filename))

    def endFile(self):
        file_data = ''
        try:
            file_data += self.template.render(
                structs=self.structs,
                enums=self.enums,
                bitmasks=self.bitmasks)
        except TemplateSyntaxError as e:
            print("{}:{} error: {}".format(e.filename, e.lineno, e.message))
            raise e
        write(file_data, file=self.outFile)

        # Finish processing in superclass
        OutputGenerator.endFile(self)

    def genType(self, typeinfo, name, alias):
        OutputGenerator.genType(self, typeinfo, name, alias)
        typeElem = typeinfo.elem

        category = typeElem.get('category')
        if category in ('struct', 'union'):
            # If the type is a struct type, generate it using the
            # special-purpose generator.
            self.genStruct(typeinfo, name, alias)

    def genStruct(self, typeinfo, typeName, alias):
        OutputGenerator.genStruct(self, typeinfo, typeName, alias)

        typeElem = typeinfo.elem

        if alias:
            return

        structTypeName = None
        members = []
        for member in typeinfo.getMembers():
            memberName = getElemName(member)
            memberType = getElemType(member)
            if self.conventions.is_structure_type_member(memberType, memberName):
                structTypeName = member.get("values")

            members.append(memberName)

        self.structs.append(CStruct(typeName, structTypeName, members, typeinfo.elem.get('protect')))

    def genGroup(self, groupinfo, groupName, alias=None):
        OutputGenerator.genGroup(self, groupinfo, groupName, alias)

        if alias:
            return

        if getElemType(groupinfo.elem) == 'bitmask':
            bitmaskTypeName = getElemName(groupinfo.flagType.elem)

            bitmaskTuples = []
            for elem in groupinfo.elem.findall('enum'):
                (numVal, strVal) = self.enumToValue(elem, True)
                bitmaskTuples.append((getElemName(elem), strVal))

            self.bitmasks.append(CBitmask(bitmaskTypeName, bitmaskTuples))
        else:
            groupElem = groupinfo.elem

            expandName = re.sub(r'([0-9a-z_])([A-Z0-9][^A-Z0-9]?)', r'\1_\2', groupName).upper()
            expandPrefix = expandName

            expandSuffix = ''
            expandSuffixMatch = re.search(r'[A-Z][A-Z]+$', groupName)
            if expandSuffixMatch:
                expandSuffix = '_' + expandSuffixMatch.group()
                # Strip off the suffix from the prefix
                expandPrefix = expandName.rsplit(expandSuffix, 1)[0]

            enumTuples = []
            for elem in groupElem.findall('enum'):
                (numVal, strVal) = self.enumToValue(elem, True)
                enumTuples.append((getElemName(elem), strVal))

            self.enums.append(CEnum(groupName, expandPrefix, expandSuffix, enumTuples))