#!/usr/bin/python

"""Copyright 2011 Gentoo Foundation
Distributed under the terms of the GNU General Public License v2
"""

from __future__ import print_function


# Meta

__author__ = "Corentin Chary (iksaif)"
__email__ = "corentin.chary@gmail.com"
__version__ = "git"
__productname__ = "euscan"
__description__ = "A tool to detect new upstream releases."


# Imports

import sys
import getopt
import errno
import httplib

from portage.output import white, yellow, turquoise, green
from portage.exception import AmbiguousPackageName

from gentoolkit import pprinter as pp
from gentoolkit.eclean.search import (port_settings)
from gentoolkit.errors import GentoolkitException

from euscan import CONFIG, output
from euscan.scan import scan_upstream


# Globals

def exit_helper(status):
    if CONFIG["format"]:
        print(output.get_formatted_output())
    sys.exit(status)


def setup_signals():
    """This block ensures that ^C interrupts are handled quietly."""
    import signal

    def exithandler(signum, frame):
        signal.signal(signal.SIGINT, signal.SIG_IGN)
        signal.signal(signal.SIGTERM, signal.SIG_IGN)
        print()
        exit_helper(errno.EINTR)

    signal.signal(signal.SIGINT, exithandler)
    signal.signal(signal.SIGTERM, exithandler)
    signal.signal(signal.SIGPIPE, signal.SIG_DFL)


def print_version():
    """Output the version info."""
    print("%s (%s) - %s" \
            % (__productname__, __version__, __description__))
    print()
    print("Author: %s <%s>" % (__author__, __email__))
    print("Copyright 2011 Gentoo Foundation")
    print("Distributed under the terms of the GNU General Public License v2")


def print_usage(_error=None, help=None):
    """Print help message. May also print partial help to stderr if an
    error from {'options'} is specified."""

    out = sys.stdout
    if _error:
        out = sys.stderr

    if not _error in ('global-options', 'packages',):
        _error = None

    if not _error and not help:
        help = 'all'

    if _error in ('global-options',):
        output.eerror("Wrong option on command line.\n")

    if _error in ('packages',):
        output.eerror("You need to specify exactly one package.\n")

    print(white("Usage:"), file=out)
    if _error in ('global-options', 'packages',) or help == 'all':
        print(" " + turquoise(__productname__),
               yellow("[options]"),
               green("<package> [<package> [...]]"), file=out)
    if _error in ('global-options',) or help == 'all':
        print(" " + turquoise(__productname__),
               yellow("[--help, --version]"), file=out)

    print(file=out)
    if _error in ('global-options',) or help:
        print("Available ", yellow("options") + ":", file=out)
        print(yellow(" -C, --nocolor") +
            "             - turn off colors on output", file=out)
        print(yellow(" -q, --quiet") +
            "               - be as quiet as possible", file=out)
        print(yellow(" -h, --help") +
            "                - display the help screen", file=out)
        print(yellow(" -V, --version") +
            "             - display version info", file=out)
        print(file=out)
        print(yellow(" -1, --oneshot") +
            "             - stop as soon as a new version is found",
            file=out)
        print(yellow(" -b, --brute-force=<level>") +
            " - define the brute force " + yellow("<level>") +
            " (default: 2)\n" +
            " " * 29 + "bigger levels will generate more versions numbers\n" +
            " " * 29 + "0 means disabled", file=out)
        print(yellow(" -f, --format=<format>") +
              "     - define the output " + yellow("<format>") +
              " (available: json)", file=out)
        print(file=out)

    if _error in ('packages',) or help:
        print(green(" package") +
            "                   - the packages (or ebuilds) you want to scan",
            file=out)
        print(file=out)

        #print( "More detailed instruction can be found in",
        #turquoise("`man %s`" % __productname__), file=out)


class ParseArgsException(Exception):
    """For parseArgs() -> main() communications."""
    def __init__(self, value):
        self.value = value

    def __str__(self):
        return repr(self.value)


def parse_args():
    """Parse the command line arguments. Raise exceptions on
    errors. Returns packages and affects the CONFIG dict.
    """

    def option_switch(opts):
        """local function for interpreting command line options
        and setting options accordingly"""
        return_code = True
        for o, a in opts:
            if o in ("-h", "--help"):
                raise ParseArgsException('help')
            elif o in ("-V", "--version"):
                raise ParseArgsException('version')
            elif o in ("-C", "--nocolor"):
                CONFIG['nocolor'] = True
                pp.output.nocolor()
            elif o in ("-q", "--quiet"):
                CONFIG['quiet'] = True
                CONFIG['verbose'] = 0
            elif o in ("-1", "--oneshot"):
                CONFIG['oneshot'] = True
            elif o in ("-b", "--brute-force"):
                CONFIG['brute-force'] = int(a)
            elif o in ("-v", "--verbose") and not CONFIG['quiet']:
                CONFIG['verbose'] += 1
            elif o in ("-f", "--format"):
                CONFIG['format'] = a
                CONFIG['nocolor'] = True
                pp.output.nocolor()
            else:
                return_code = False

        return return_code

    # here are the different allowed command line options (getopt args)
    getopt_options = {'short': {}, 'long': {}}
    getopt_options['short']['global'] = "hVCqv1bf:"
    getopt_options['long']['global'] = [
        "help", "version", "nocolor", "quiet", "verbose", "oneshot",
        "brute-force=", "format="
    ]

    short_opts = getopt_options['short']['global']
    long_opts = getopt_options['long']['global']
    opts_mode = 'global'

    # apply getopts to command line, show partial help on failure
    try:
        opts, args = getopt.getopt(sys.argv[1:], short_opts, long_opts)
    except:
        raise ParseArgsException(opts_mode + '-options')

    # set options accordingly
    option_switch(opts)

    if len(args) < 1:
        raise ParseArgsException('packages')

    return args


def main():
    """Parse command line and execute all actions."""
    CONFIG['nocolor'] = (
        port_settings["NOCOLOR"] in ('yes', 'true') or not sys.stdout.isatty()
    )
    if CONFIG['nocolor']:
        pp.output.nocolor()

    # parse command line options and actions
    try:
        queries = parse_args()
    except ParseArgsException as e:
        if e.value == 'help':
            print_usage(help='all')
            exit_helper(0)

        elif e.value[:5] == 'help-':
            print_usage(help=e.value[5:])
            exit_helper(0)

        elif e.value == 'version':
            print_version()
            exit_helper(0)

        else:
            print_usage(e.value)
            exit_helper(errno.EINVAL)

    if CONFIG['verbose'] > 2:
        httplib.HTTPConnection.debuglevel = 1

    for query in queries:
        ret = []

        output.set_query(query)

        try:
            ret = scan_upstream(query)
        except AmbiguousPackageName as e:
            pkgs = e.args[0]
            output.eerror("\n".join(pkgs))

            from os.path import basename  # To get the short name

            output.error(
                "The short ebuild name '%s' is ambiguous. Please specify" %
                    basename(pkgs[0]),
                "one of the above fully-qualified ebuild names instead."
            )
            exit_helper(1)

        except GentoolkitException as err:
            output.eerror('%s: %s' % (query, str(err)))
            exit_helper(1)

        except Exception as err:
            output.eerror('%s: %s' % (query, str(err)))
            exit_helper(1)

        if not CONFIG['quiet'] and not CONFIG['format']:
            print()

        if ret is not None:
            if len(ret) > 0:
                for cp, url, version, handler in ret:
                    output.result(cp, version, url, handler)
            elif not CONFIG['quiet']:
                output.ewarn(
                    "Didn't find any new version, check package's homepage " +
                    "for more informations"
                )

    output.set_query(None)


if __name__ == "__main__":
    setup_signals()
    main()
    exit_helper(0)