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#!/usr/bin/env python
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this,
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import print_function, unicode_literals

import os
import subprocess
import sys
from textwrap import wrap


def call(cmd, **kwargs):
    print(" ".join(cmd))
    return subprocess.call(cmd, **kwargs)


def resume():
    call(['run-mozharness'])


def setup():
    call(['run-mozharness', '--no-run-tests'])
    print("Mozharness has finished downloading the build and "
          "tests to {}.".format(os.path.join(os.getcwd(), 'build')))


def clone():
    repo = os.environ['GECKO_HEAD_REPOSITORY']
    rev = os.environ['GECKO_HEAD_REV']
    clone_path = os.path.expanduser(os.path.join('~', 'gecko'))

    # try is too large to clone, instead clone central and pull
    # in changes from try
    if "hg.mozilla.org/try" in repo:
        central = 'http://hg.mozilla.org/mozilla-central'
        call(['hg', 'clone', '-U', central, clone_path])
        call(['hg', 'pull', '-u', '-r', rev, repo], cwd=clone_path)
    else:
        call(['hg', 'clone', '-u', rev, repo, clone_path])
    print("Finished cloning to {} at revision {}.".format(
                clone_path, rev))


def exit():
    pass


OPTIONS = [
    ('Resume task', resume,
     "Resume the original task without modification. This can be useful for "
     "passively monitoring it from another shell."),
    ('Setup task', setup,
     "Setup the task (download the application and tests) but don't run the "
     "tests just yet. The tests can be run with a custom configuration later "
     "(experimental)."),
    ('Clone gecko', clone,
     "Perform a clone of gecko using the task's repo and update it to the "
     "task's revision."),
    ('Exit', exit, "Exit this wizard and return to the shell.")
]


def _fmt_options():
    max_line_len = 60
    max_name_len = max(len(o[0]) for o in OPTIONS)

    # TODO Pad will be off if there are more than 9 options.
    pad = ' ' * (max_name_len+6)

    msg = []
    for i, (name, _, desc) in enumerate(OPTIONS):
        desc = wrap(desc, width=max_line_len)
        desc = [desc[0]] + [pad + l for l in desc[1:]]

        optstr = '{}) {} - {}\n'.format(
            i+1, name.ljust(max_name_len), '\n'.join(desc))
        msg.append(optstr)
    msg.append("Select one of the above options: ")
    return '\n'.join(msg)


def wizard():
    print("This wizard can help you get started with some common debugging "
          "workflows.\nWhat would you like to do?\n")
    print(_fmt_options(), end="")
    choice = None
    while True:
        choice = raw_input().decode('utf8')
        try:
            choice = int(choice)-1
            if 0 <= choice < len(OPTIONS):
                break
        except ValueError:
            pass

        print("Must provide an integer from 1-{}:".format(len(OPTIONS)))

    func = OPTIONS[choice][1]
    ret = func()

    print("Use the 'run-wizard' command to start this wizard again.")
    return ret


if __name__ == '__main__':
    sys.exit(wizard())