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"""Generate template values for a callback interface.

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
"""

from v8_types import cpp_type, cpp_value_to_v8_value, includes_for_type
from v8_utilities import v8_class_name, extended_attribute_value_contains

CALLBACK_INTERFACE_H_INCLUDES = set([
    'bindings/v8/ActiveDOMCallback.h',
    'bindings/v8/DOMWrapperWorld.h',
    'bindings/v8/ScopedPersistent.h',
])
CALLBACK_INTERFACE_CPP_INCLUDES = set([
    'core/dom/ExecutionContext.h',
    'bindings/v8/V8Binding.h',
    'bindings/v8/V8Callback.h',
    'wtf/Assertions.h',
])
CPP_TO_V8_CONVERSION = 'v8::Handle<v8::Value> {name}Handle = {cpp_value_to_v8_value};'


def cpp_to_v8_conversion(idl_type, name):
    # Includes handled in includes_for_operation
    this_cpp_value_to_v8_value = cpp_value_to_v8_value(idl_type, name, set(), 'isolate', creation_context='v8::Handle<v8::Object>()')
    return CPP_TO_V8_CONVERSION.format(name=name, cpp_value_to_v8_value=this_cpp_value_to_v8_value)


def generate_callback_interface(callback_interface):
    cpp_includes = CALLBACK_INTERFACE_CPP_INCLUDES

    def generate_method(operation):
        method_contents, method_cpp_includes = generate_method_and_includes(operation)
        cpp_includes.update(method_cpp_includes)
        return method_contents

    methods = [generate_method(operation) for operation in callback_interface.operations]
    template_contents = {
        'cpp_class_name': callback_interface.name,
        'v8_class_name': v8_class_name(callback_interface),
        'header_includes': CALLBACK_INTERFACE_H_INCLUDES,
        'cpp_includes': cpp_includes,
        'methods': methods,
    }
    return template_contents


def generate_method_and_includes(operation):
    if 'Custom' in operation.extended_attributes:
        return generate_method_contents(operation), []
    if operation.data_type != 'boolean':
        raise Exception("We don't yet support callbacks that return non-boolean values.")
    cpp_includes = includes_for_operation(operation)
    return generate_method_contents(operation), cpp_includes


def includes_for_operation(operation):
    includes = includes_for_type(operation.data_type)
    for argument in operation.arguments:
        includes.update(includes_for_type(argument.data_type))
    return includes


def generate_method_contents(operation):
    extended_attributes = operation.extended_attributes
    call_with = extended_attributes.get('CallWith')
    contents = {
        'name': operation.name,
        'return_cpp_type': cpp_type(operation.data_type, 'RefPtr'),
        'custom': 'Custom' in extended_attributes,
        'call_with_this_handle': extended_attribute_value_contains(call_with, 'ThisValue'),
    }
    contents.update(generate_arguments_contents(operation.arguments, call_with_this_handle))
    return contents


def generate_arguments_contents(arguments, call_with_this_handle):
    def argument_declaration(argument):
        return '%s %s' % (cpp_type(argument.data_type), argument.name)

    def generate_argument(argument):
        return {
            'name': argument.name,
            'cpp_to_v8_conversion': cpp_to_v8_conversion(argument.data_type, argument.name),
        }

    argument_declarations = [argument_declaration(argument) for argument in arguments]
    if call_with_this_handle:
        argument_declarations.insert(0, 'ScriptValue thisValue')
    return  {
        'argument_declarations': argument_declarations,
        'arguments': [generate_argument(argument) for argument in arguments],
        'handles': ['%sHandle' % argument.name for argument in arguments],
    }