#!/usr/bin/python
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"""Compile an .idl file to Dart bindings (.h and .cpp files).

Design doc: ??????
"""

from optparse import OptionParser
import os
import sys

from dart_compiler import IdlCompiler
from code_generator_dart import CodeGeneratorDart


def parse_options():
    parser = OptionParser()
    parser.add_option('--output-directory')
    parser.add_option('--interfaces-info-file')
    parser.add_option('--write-file-only-if-changed', type='int', default='1')
    parser.add_option('--generate-dart-blink',
                      action='append',
                      type='string',
                      dest='blink_global_entries',
                      nargs=2,
                      help="Pickle file directory and idl file list (dart:blink)")

    parser.add_option('--generate-globals',
                      action='append',
                      type='string',
                      dest='global_entries',
                      nargs=2,
                      help="Pickle file directory and idl file list (global class table)")

    # 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 bool(options.global_entries) or bool(options.blink_global_entries):
        return options, None
    if len(args) != 1:
        parser.error('Must specify exactly 1 input file as argument, but %d given.' % len(args))
    filename = os.path.realpath(args[0])
    return options, 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 IdlCompilerDart(IdlCompiler):
    def __init__(self, *args, **kwargs):
        IdlCompiler.__init__(self, *args, **kwargs)

        interfaces_info = self.interfaces_info
        self.output_directory = self.output_directory

        self.code_generator = CodeGeneratorDart(interfaces_info, self.output_directory)

    def compile_file(self, idl_filename):
        interface_name = idl_filename_to_interface_name(idl_filename)
        header_filename = os.path.join(self.output_directory,
                                       'Dart%s.h' % interface_name)
        cpp_filename = os.path.join(self.output_directory,
                                    'Dart%s.cpp' % interface_name)
        dart_filename = os.path.join(self.output_directory,
                                       '%s.dart' % interface_name)
        output_paths = (header_filename, cpp_filename, dart_filename)
        self.compile_and_write(idl_filename, output_paths)

    def generate_global(self, global_entries):
        expanded_global_entries = []
        for (directory, file_list_file) in global_entries:
            with open(file_list_file) as input_file:
                idl_file_list = sorted([line.rstrip('\n')
                                        for line in input_file])
            expanded_global_entries.append((directory, idl_file_list))
        global_header_filename = os.path.join(self.output_directory, 'DartGlobal.h')
        global_cpp_filename = os.path.join(self.output_directory, 'DartGlobal.cpp')
        self.generate_global_and_write(expanded_global_entries,
                                       (global_header_filename, global_cpp_filename))

    def generate_dart_blink(self, global_entries):
        global_dart_blink_filename = os.path.join(self.output_directory,
                                                  'dart_sky.dart')
        expanded_global_entries = []
        for (directory, file_list_file) in global_entries:
            with open(file_list_file) as input_file:
                idl_file_list = sorted([line.rstrip('\n')
                                        for line in input_file])
            expanded_global_entries.append((directory, idl_file_list))
        self.generate_dart_blink_and_write(expanded_global_entries,
                                           global_dart_blink_filename)


def main():
    options, filename = parse_options()
    idl_compiler = IdlCompilerDart(options.output_directory,
                                   interfaces_info_filename=options.interfaces_info_file,
                                   only_if_changed=options.write_file_only_if_changed)
    if bool(options.global_entries):
        idl_compiler.generate_global(options.global_entries)
    elif bool(options.blink_global_entries):
        idl_compiler.generate_dart_blink(options.blink_global_entries)
    else:
        idl_compiler.compile_file(filename)


if __name__ == '__main__':
    sys.exit(main())