#!/usr/bin/env python3
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"""Compile an .idl file to Blink C++ bindings (.h and .cpp files) for Dart:HTML.

Design doc: http://www.chromium.org/developers/design-documents/idl-compiler
"""

import abc
from optparse import OptionParser
import os
import pickle

from idl_reader import IdlReader
from utilities import write_file

# TODO(terry): Temporary whitelist of IDL files to skip code generating. e.g.,
#              adding 'Animation.idl' to this list will skip that IDL file.
SKIP_IDL_FILES = ['']


def parse_options():
    parser = OptionParser()
    parser.add_option(
        '--idl-attributes-file',
        help="location of bindings/IDLExtendedAttributes.txt")
    parser.add_option('--output-directory')
    parser.add_option('--interfaces-info-file')
    parser.add_option('--write-file-only-if-changed', type='int')
    # ensure output comes last, so command line easy to parse via regexes
    parser.disable_interspersed_args()

    options, args = parser.parse_args()
    if options.output_directory is None:
        parser.error('Must specify output directory using --output-directory.')
    options.write_file_only_if_changed = bool(
        options.write_file_only_if_changed)
    if len(args) != 1:
        parser.error(
            'Must specify exactly 1 input file as argument, but %d given.' %
            len(args))
    idl_filename = os.path.realpath(args[0])
    return options, idl_filename


def idl_filename_to_interface_name(idl_filename):
    basename = os.path.basename(idl_filename)
    interface_name, _ = os.path.splitext(basename)
    return interface_name


class IdlCompiler(object):
    """Abstract Base Class for IDL compilers.

    In concrete classes:
    * self.code_generator must be set, implementing generate_code()
      (returning a list of output code), and
    * compile_file() must be implemented (handling output filenames).
    """
    __metaclass__ = abc.ABCMeta

    def __init__(self,
                 output_directory,
                 code_generator=None,
                 interfaces_info=None,
                 interfaces_info_filename='',
                 only_if_changed=False):
        """
        Args:
            interfaces_info:
                interfaces_info dict
                (avoids auxiliary file in run-bindings-tests)
            interfaces_info_file: filename of pickled interfaces_info
        """
        self.code_generator = code_generator
        if interfaces_info_filename:
            with open(interfaces_info_filename) as interfaces_info_file:
                interfaces_info = pickle.load(interfaces_info_file)
        self.interfaces_info = interfaces_info

        self.only_if_changed = only_if_changed
        self.output_directory = output_directory
        self.reader = IdlReader(interfaces_info, output_directory, True)

    def compile_and_write(self, idl_filename, output_filenames):
        # Only compile the IDL file and return the AST.
        definitions = self.reader.read_idl_definitions(idl_filename)
        return definitions

    def generate_global_and_write(self, output_filenames):
        pass

    @abc.abstractmethod
    def compile_file(self, idl_filename):
        pass