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import getpass
import logging
import os
import platform
import re
import shlex
import subprocess
import sys
import webbrowser

from webkitpy.common.system.executive import Executive
from webkitpy.common.system.platforminfo import PlatformInfo


_log = logging.getLogger(__name__)


class User(object):
    DEFAULT_NO = 'n'
    DEFAULT_YES = 'y'

    def __init__(self, platforminfo=None):
        # We cannot get the PlatformInfo object from a SystemHost because
        # User is part of SystemHost itself.
        self._platforminfo = platforminfo or PlatformInfo(sys, platform, Executive())

    # FIXME: These are @classmethods because bugzilla.py doesn'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_password(cls, message, repeat=1):
        return cls.prompt(message, repeat=repeat, raw_input=getpass.getpass)

    @classmethod
    def prompt_with_multiple_lists(cls, list_title, subtitles, lists, can_choose_multiple=False, raw_input=raw_input):
        item_index = 0
        cumulated_list = []
        print list_title
        for i in range(len(subtitles)):
            print "\n" + subtitles[i]
            for item in lists[i]:
                item_index += 1
                print "%2d. %s" % (item_index, item)
            cumulated_list += lists[i]
        return cls._wait_on_list_response(cumulated_list, can_choose_multiple, raw_input)

    @classmethod
    def _wait_on_list_response(cls, list_items, can_choose_multiple, raw_input):
        while True:
            if can_choose_multiple:
                response = cls.prompt("Enter one or more numbers (comma-separated) or ranges (e.g. 3-7), or \"all\": ", raw_input=raw_input)
                if not response.strip() or response == "all":
                    return list_items

                try:
                    indices = []
                    for value in re.split("\s*,\s*", response):
                        parts = value.split('-')
                        if len(parts) == 2:
                            indices += range(int(parts[0]) - 1, int(parts[1]))
                        else:
                            indices.append(int(value) - 1)
                except ValueError, err:
                    continue

                return [list_items[i] for i in indices]
            else:
                try:
                    result = int(cls.prompt("Enter a number: ", raw_input=raw_input)) - 1
                except ValueError, err:
                    continue
                return list_items[result]

    @classmethod
    def prompt_with_list(cls, list_title, list_items, can_choose_multiple=False, raw_input=raw_input):
        print list_title
        i = 0
        for item in list_items:
            i += 1
            print "%2d. %s" % (i, item)
        return cls._wait_on_list_response(list_items, can_choose_multiple, raw_input)

    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, default=DEFAULT_YES, raw_input=raw_input):
        if not message:
            message = "Continue?"
        choice = {'y': 'Y/n', 'n': 'y/N'}[default]
        response = raw_input("%s [%s]: " % (message, choice))
        if not response:
            response = default
        return response.lower() == 'y'

    def can_open_url(self):
        try:
            webbrowser.get()
            return True
        except webbrowser.Error, e:
            return False

    def open_url(self, url):
        if not self.can_open_url():
            _log.warn("Failed to open %s" % url)
        webbrowser.open(url)