#!/usr/bin/env python

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

from __future__ import print_function
import os

# 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
from errno import EINTR, EINVAL
from httplib import HTTPConnection

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

from gentoolkit import pprinter as pp
from gentoolkit.errors import GentoolkitException

from euscan import CONFIG, output
from euscan.out import progress_bar


# Globals
isatty = os.environ.get('TERM') != 'dumb' and sys.stdout.isatty()
isatty_stderr = os.environ.get('TERM') != 'dumb' and sys.stderr.isatty()


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(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" +
            " " * 38 + "bigger levels will generate more versions numbers\n" +
            " " * 38 + "0 means disabled", file=out)
        print(yellow(" -f, --format=<format>") +
            "              - define the output " + yellow("<format>") +
            " (available: json)", file=out)
        print(yellow(" -p, --progress") +
            "                     - display a progress bar", file=out)
        print(yellow(" -i, --ignore-pre-release") +
            " " * 11 + "- Ignore non-stable versions", file=out)
        print(yellow(" -I, --ignore-pre-release-if-stable") +
            " - Ignore non-stable versions only if current\n" +
            " " * 38 + "version is stable", file=out)
        print(yellow("     --mirror") +
            "                       - use mirror:// URIs", file=out)
        print(yellow("     --ebuild-uri") +
            "                   - use ebuild variables in URIs", file=out)
        print(yellow("     --no-handlers") +
            "                  - exclude handlers (comma-separated list)",
            file=out)
        print(file=out)

    if _error in ('packages',) or help:
        print(green(" package") +
            " " * 28 + "- 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()
            elif o in ("-p", "--progress"):
                CONFIG['progress'] = isatty_stderr
            elif o in ("--mirror"):
                CONFIG['mirror'] = True
            elif o in ("-i", "--ignore-pre-release"):
                CONFIG['ignore-pre-release'] = True
            elif o in ("-I", "--ignore-pre-release-if-stable"):
                CONFIG['ignore-pre-release-if-stable'] = True
            elif o in ("--ebuild-uri"):
                CONFIG['ebuild-uri'] = True
            elif o in ("--no-handlers"):
                CONFIG['handlers-exclude'] = a.split(",")
            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:piI"
    getopt_options['long']['global'] = [
        "help", "version", "nocolor", "quiet", "verbose", "oneshot",
        "brute-force=", "format=", "progress", "mirror", "ignore-pre-release",
        "ignore-pre-release-if-stable", "ebuild-uri", "no-handlers="
    ]

    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'] = (
        CONFIG['nocolor'] or
        (settings["NOCOLOR"] in ('yes', 'true') or not 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(EINVAL)

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

    if not CONFIG["format"] and not CONFIG['quiet']:
        CONFIG["progress"] = False

    on_progress = None
    if CONFIG['progress']:
        on_progress_gen = progress_bar()
        on_progress = on_progress_gen.next()
        on_progress(maxval=len(queries) * 100, increment=0, label="Working...")

    # Importing stuff here for performance reasons
    from euscan.scan import scan_upstream

    for query in queries:
        if CONFIG["progress"]:
            on_progress(increment=10, label=query)

        ret = []

        output.set_query(query)

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

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

            output.eerror(
                "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:
            import traceback
            print ('-' * 60)
            traceback.print_exc(file=sys.stderr)
            print ('-' * 60)

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

        if not ret and not CONFIG['quiet']:
            output.einfo(
                "Didn't find any new version, check package's homepage " +
                "for more informations"
            )

        if not (CONFIG['format'] or CONFIG['quiet']) and len(queries) > 1:
            print("")

    if CONFIG['progress']:
        on_progress_gen.next()
        print("\n", file=sys.stderr)

    output.set_query(None)


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