# Copyright (C) 2010 Google Inc. All rights reserved.
#
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# THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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import glob
import logging
import optparse
import os
import re
import sys
from webkitpy.common.checkout import scm
from webkitpy.common.system.filesystem import FileSystem
from webkitpy.common.system.executive import Executive


_log = logging.getLogger(__name__)


def remove_first_line_comment(text):
    return re.compile(r'^<!--.*?-->\s*', re.DOTALL).sub('', text)


def translate_includes(text):
    # Mapping of single filename to relative path under WebKit root.
    # Assumption: these filenames are globally unique.
    include_mapping = {
        "js-test-pre.js": "../../../resources",
        "js-test-post.js": "../../../resources",
        "desktop-gl-constants.js": "resources",
    }

    for filename, path in include_mapping.items():
        search = r'(?:[^"\'= ]*/)?' + re.escape(filename)
        # We use '/' instead of os.path.join in order to produce consistent
        # output cross-platform.
        replace = path + '/' + filename
        text = re.sub(search, replace, text)

    return text


def translate_khronos_test(text):
    """
    This method translates the contents of a Khronos test to a WebKit test.
    """

    translateFuncs = [
        remove_first_line_comment,
        translate_includes,
    ]

    for f in translateFuncs:
        text = f(text)

    return text


def update_file(in_filename, out_dir):
    # check in_filename exists
    # check out_dir exists
    out_filename = os.path.join(out_dir, os.path.basename(in_filename))

    _log.debug("Processing " + in_filename)
    with open(in_filename, 'r') as in_file:
        with open(out_filename, 'w') as out_file:
            out_file.write(translate_khronos_test(in_file.read()))


def update_directory(in_dir, out_dir):
    for filename in glob.glob(os.path.join(in_dir, '*.html')):
        update_file(os.path.join(in_dir, filename), out_dir)


def default_out_dir():
    detector = scm.SCMDetector(FileSystem(), Executive())
    current_scm = detector.detect_scm_system(os.path.dirname(sys.argv[0]))
    if not current_scm:
        return os.getcwd()
    root_dir = current_scm.checkout_root
    if not root_dir:
        return os.getcwd()
    out_dir = os.path.join(root_dir, "LayoutTests/fast/canvas/webgl")
    if os.path.isdir(out_dir):
        return out_dir
    return os.getcwd()


def configure_logging(options):
    """Configures the logging system."""
    log_fmt = '%(levelname)s: %(message)s'
    log_datefmt = '%y%m%d %H:%M:%S'
    log_level = logging.INFO
    if options.verbose:
        log_fmt = ('%(asctime)s %(filename)s:%(lineno)-4d %(levelname)s '
                   '%(message)s')
        log_level = logging.DEBUG
    logging.basicConfig(level=log_level, format=log_fmt,
                        datefmt=log_datefmt)


def option_parser():
    usage = "usage: %prog [options] (input file or directory)"
    parser = optparse.OptionParser(usage=usage)
    parser.add_option('-v', '--verbose',
                             action='store_true',
                             default=False,
                             help='include debug-level logging')
    parser.add_option('-o', '--output',
                             action='store',
                             type='string',
                             default=default_out_dir(),
                             metavar='DIR',
                             help='specify an output directory to place files '
                                  'in [default: %default]')
    return parser


def main():
    parser = option_parser()
    (options, args) = parser.parse_args()
    configure_logging(options)

    if len(args) == 0:
        _log.error("Must specify an input directory or filename.")
        parser.print_help()
        return 1

    in_name = args[0]
    if os.path.isfile(in_name):
        update_file(in_name, options.output)
    elif os.path.isdir(in_name):
        update_directory(in_name, options.output)
    else:
        _log.error("'%s' is not a directory or a file.", in_name)
        return 2

    return 0