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"""Read an IDL file or complete IDL interface, producing an IdlDefinitions object."""

import os.path

import blink_idl_parser
import idl_definitions_builder
import idl_validator
import interface_dependency_resolver


class IdlReader:
    def __init__(self, interface_dependencies_filename=None, additional_idl_filenames=None, idl_attributes_filename=None, outputdir='', verbose=False):
        if idl_attributes_filename:
            self.extended_attribute_validator = idl_validator.IDLExtendedAttributeValidator(idl_attributes_filename)
        else:
            self.extended_attribute_validator = None

        if interface_dependencies_filename:
            self.interface_dependency_resolver = interface_dependency_resolver.InterfaceDependencyResolver(interface_dependencies_filename, additional_idl_filenames, self)
        else:
            self.interface_dependency_resolver = None

        self.parser = blink_idl_parser.BlinkIDLParser(outputdir=outputdir, verbose=verbose)

    def read_idl_definitions(self, idl_filename):
        """Returns an IdlDefinitions object for an IDL file, including all dependencies."""
        basename = os.path.basename(idl_filename)
        interface_name, _ = os.path.splitext(basename)
        definitions = self.read_idl_file(idl_filename)
        if self.interface_dependency_resolver:
            should_generate_bindings = self.interface_dependency_resolver.resolve_dependencies(definitions, interface_name)
            if not should_generate_bindings:
                return None
        return definitions

    def read_idl_file(self, idl_filename):
        """Returns an IdlDefinitions object for an IDL file, without any dependencies."""
        ast = blink_idl_parser.parse_file(self.parser, idl_filename)
        definitions = idl_definitions_builder.build_idl_definitions_from_ast(ast)
        if self.extended_attribute_validator:
            try:
                self.extended_attribute_validator.validate_extended_attributes(definitions)
            except idl_validator.IDLInvalidExtendedAttributeError as error:
                raise idl_validator.IDLInvalidExtendedAttributeError("""IDL ATTRIBUTE ERROR in file %s:
    %s
If you want to add a new IDL extended attribute, please add it to
    bindings/IDLExtendedAttributes.txt
and add an explanation to the Blink IDL documentation at:
    http://www.chromium.org/blink/webidl/blink-idl-extended-attributes
    """ % (idl_filename, str(error)))

        return definitions