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"""Generate template values for attributes.

FIXME: Not currently used in build.
This is a rewrite of the Perl IDL compiler in Python, but is not complete.
Once it is complete, we will switch all IDL files over to Python at once.
Until then, please work on the Perl IDL compiler.
For details, see bug http://crbug.com/239771
"""

import v8_types
import v8_utilities
from v8_utilities import cpp_method_name, generate_conditional_string, uncapitalize


def generate_attributes(interface):
    def generate_attribute(attribute):
        attribute_contents, attribute_includes = generate_attribute_and_includes(attribute)
        includes.update(attribute_includes)
        return attribute_contents

    includes = set()
    contents = generate_attributes_common(interface)
    contents['attributes'] = [generate_attribute(attribute) for attribute in interface.attributes]
    return contents, includes


def generate_attributes_common(interface):
    attributes = interface.attributes
    v8_class_name = v8_utilities.v8_class_name(interface)
    return {
        # Size 0 constant array is not allowed in VC++
        'number_of_attributes': 'WTF_ARRAY_LENGTH(%sAttributes)' % v8_class_name if attributes else '0',
        'attribute_templates': '%sAttributes' % v8_class_name if attributes else '0',
    }


def generate_attribute_and_includes(attribute):
    idl_type = attribute.data_type
    # FIXME: need to check should_keep_attribute_alive, but for now sufficient
    # to check if primitive.
    should_keep_attribute_alive = not v8_types.primitive_type(idl_type)
    if should_keep_attribute_alive:
        return_v8_value_statement = None  # unused
        includes = v8_types.includes_for_type(idl_type)
        includes.add('bindings/v8/V8HiddenPropertyName.h')
    else:
        cpp_value = 'imp->%s()' % uncapitalize(attribute.name)
        return_v8_value_statement, includes = v8_types.v8_set_return_value(idl_type, cpp_value, callback_info='info', isolate='info.GetIsolate()', extended_attributes=attribute.extended_attributes)
    contents = {
        'name': attribute.name,
        'conditional_string': generate_conditional_string(attribute),
        'cpp_method_name': cpp_method_name(attribute),
        'cpp_type': v8_types.cpp_type(idl_type),
        'should_keep_attribute_alive': should_keep_attribute_alive,
        'return_v8_value_statement': return_v8_value_statement,
        'v8_type': v8_types.v8_type(idl_type),
    }
    return contents, includes