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import logging
import os
import shlex
import subprocess
import sys
import webbrowser


_log = logging.getLogger("webkitpy.common.system.user")


try:
    import readline
except ImportError:
    if sys.platform != "win32":
        # There is no readline module for win32, not much to do except cry.
        _log.warn("Unable to import readline.")
    # FIXME: We could give instructions for non-mac platforms.
    # Lack of readline results in a very bad user experiance.
    if sys.platform == "mac":
        _log.warn("If you're using MacPorts, try running:")
        _log.warn("  sudo port install py25-readline")


class User(object):
    # FIXME: These are @classmethods because scm.py and bugzilla.py don't have a Tool object (thus no User instance).
    @classmethod
    def prompt(cls, message, repeat=1, raw_input=raw_input):
        response = None
        while (repeat and not response):
            repeat -= 1
            response = raw_input(message)
        return response

    @classmethod
    def prompt_with_list(cls, list_title, list_items):
        print list_title
        i = 0
        for item in list_items:
            i += 1
            print "%2d. %s" % (i, item)
        result = int(cls.prompt("Enter a number: ")) - 1
        return list_items[result]

    def edit(self, files):
        editor = os.environ.get("EDITOR") or "vi"
        args = shlex.split(editor)
        # Note: Not thread safe: http://bugs.python.org/issue2320
        subprocess.call(args + files)

    def page(self, message):
        pager = os.environ.get("PAGER") or "less"
        try:
            # Note: Not thread safe: http://bugs.python.org/issue2320
            child_process = subprocess.Popen([pager], stdin=subprocess.PIPE)
            child_process.communicate(input=message)
        except IOError, e:
            pass

    def confirm(self, message=None):
        if not message:
            message = "Continue?"
        response = raw_input("%s [Y/n]: " % message)
        return not response or response.lower() == "y"

    def open_url(self, url):
        webbrowser.open(url)