import sys
import argparse

from .premailer import Premailer


def main(args):
    """Command-line tool to transform html style to inline css

    Usage::

        $ echo '<style>h1 { color:red; }</style><h1>Title</h1>' | \
        python -m premailer
        <h1 style="color:red"></h1>
        $ cat newsletter.html | python -m premailer
    """

    parser = argparse.ArgumentParser(usage="python -m premailer [options]")

    parser.add_argument(
        "-f",
        "--file",
        nargs="?",
        type=argparse.FileType("r"),
        help="Specifies the input file.  The default is stdin.",
        default=sys.stdin,
        dest="infile",
    )

    parser.add_argument(
        "-o",
        "--output",
        nargs="?",
        type=argparse.FileType("w"),
        help="Specifies the output file.  The default is stdout.",
        default=sys.stdout,
        dest="outfile",
    )

    parser.add_argument("--base-url", default=None, type=str, dest="base_url")

    parser.add_argument(
        "--remove-internal-links",
        default=True,
        help="Remove links that start with a '#' like anchors.",
        dest="preserve_internal_links",
    )

    parser.add_argument(
        "--exclude-pseudoclasses",
        default=False,
        help="Pseudo classes like p:last-child', p:first-child, etc",
        action="store_true",
        dest="exclude_pseudoclasses",
    )

    parser.add_argument(
        "--preserve-style-tags",
        default=False,
        help="Do not delete <style></style> tags from the html document.",
        action="store_true",
        dest="keep_style_tags",
    )

    parser.add_argument(
        "--remove-star-selectors",
        default=True,
        help="All wildcard selectors like '* {color: black}' will be removed.",
        action="store_false",
        dest="include_star_selectors",
    )

    parser.add_argument(
        "--remove-classes",
        default=False,
        help="Remove all class attributes from all elements",
        action="store_true",
        dest="remove_classes",
    )

    parser.add_argument(
        "--capitalize-float-margin",
        default=False,
        help="Capitalize float and margin properties for outlook.com compat.",
        action="store_true",
        dest="capitalize_float_margin",
    )

    parser.add_argument(
        "--strip-important",
        default=False,
        help="Remove '!important' for all css declarations.",
        action="store_true",
        dest="strip_important",
    )

    parser.add_argument(
        "--method",
        default="html",
        dest="method",
        help="The type of html to output. 'html' for HTML, 'xml' for XHTML.",
    )

    parser.add_argument(
        "--base-path",
        default=None,
        dest="base_path",
        help="The base path for all external stylsheets.",
    )

    parser.add_argument(
        "--external-style",
        action="append",
        dest="external_styles",
        help="The path to an external stylesheet to be loaded.",
    )

    parser.add_argument(
        "--css-text",
        action="append",
        dest="css_text",
        help="CSS text to be applied to the html.",
    )

    parser.add_argument(
        "--disable-basic-attributes",
        dest="disable_basic_attributes",
        help="Disable provided basic attributes (comma separated)",
        default=[],
    )

    parser.add_argument(
        "--disable-validation",
        default=False,
        action="store_true",
        dest="disable_validation",
        help="Disable CSSParser validation of attributes and values",
    )

    parser.add_argument(
        "--pretty",
        default=False,
        action="store_true",
        help="Pretty-print the outputted HTML.",
    )

    parser.add_argument(
        "--encoding", default="utf-8", help="Output encoding. The default is utf-8"
    )

    parser.add_argument(
        "--allow-insecure-ssl",
        default=False,
        action="store_true",
        help="Skip SSL certificate verification for external URLs.",
    )

    parser.add_argument(
        "--allow-loading-external-files",
        default=False,
        action="store_true",
        help="Allow opening any non-HTTP external file URL.",
    )

    options = parser.parse_args(args)

    if options.disable_basic_attributes:
        options.disable_basic_attributes = options.disable_basic_attributes.split()

    html = options.infile.read()
    if hasattr(html, "decode"):  # Forgive me: Python 2 compatability
        html = html.decode("utf-8")

    p = Premailer(
        html=html,
        base_url=options.base_url,
        preserve_internal_links=options.preserve_internal_links,
        exclude_pseudoclasses=options.exclude_pseudoclasses,
        keep_style_tags=options.keep_style_tags,
        include_star_selectors=options.include_star_selectors,
        remove_classes=options.remove_classes,
        strip_important=options.strip_important,
        external_styles=options.external_styles,
        css_text=options.css_text,
        method=options.method,
        base_path=options.base_path,
        disable_basic_attributes=options.disable_basic_attributes,
        disable_validation=options.disable_validation,
        allow_insecure_ssl=options.allow_insecure_ssl,
        allow_loading_external_files=options.allow_loading_external_files,
    )
    options.outfile.write(
        p.transform(encoding=options.encoding, pretty_print=options.pretty)
    )
    return 0


if __name__ == "__main__":  # pragma: no cover
    sys.exit(main(sys.argv[1:]))