#!/usr/bin/env python3

# Copyright 2014 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

from __future__ import print_function

import argparse
import doctest
import itertools
import os
import plistlib
import subprocess
import sys

if sys.version_info.major < 3:
    basestring_compat = basestring
else:
    basestring_compat = str

# src directory
ROOT_SRC_DIR = os.path.dirname(
    os.path.dirname(os.path.dirname(os.path.dirname(
        os.path.realpath(__file__)))))

# This script prints information about the build system, the operating system
# and the iOS or Mac SDK (depending on the platform "iphonesimulator",
# "iphoneos" or "macosx" generally).


def LoadPList(path):
    """Loads Plist at |path| and returns it as a dictionary."""
    # Cloned from //build/apple/plist_util.py.
    if sys.version_info.major == 2:
        return plistlib.readPlist(path)
    with open(path, 'rb') as f:
        return plistlib.load(f)


def SplitVersion(version):
    """Splits the Xcode version to 3 values.

    >>> list(SplitVersion('8.2.1.1'))
    ['8', '2', '1']
    >>> list(SplitVersion('9.3'))
    ['9', '3', '0']
    >>> list(SplitVersion('10.0'))
    ['10', '0', '0']
    """
    version = version.split('.')
    return itertools.islice(itertools.chain(version, itertools.repeat('0')), 0,
                            3)


def FormatVersion(version):
    """Converts Xcode version to a format required for DTXcode in Info.plist

    >>> FormatVersion('8.2.1')
    '0821'
    >>> FormatVersion('9.3')
    '0930'
    >>> FormatVersion('10.0')
    '1000'
    """
    major, minor, patch = SplitVersion(version)
    return ('%2s%s%s' % (major, minor, patch)).replace(' ', '0')


def FillXcodeVersion(settings, developer_dir):
    """Fills the Xcode version and build number into |settings|."""
    if developer_dir:
        xcode_version_plist_path = os.path.join(developer_dir,
                                                'Contents/version.plist')
        version_plist = LoadPList(xcode_version_plist_path)
        settings['xcode_version'] = FormatVersion(
            version_plist['CFBundleShortVersionString'])
        settings['xcode_version_int'] = int(settings['xcode_version'], 10)
        settings['xcode_build'] = version_plist['ProductBuildVersion']
        return

    lines = subprocess.check_output(['xcodebuild',
                                     '-version']).decode('UTF-8').splitlines()
    settings['xcode_version'] = FormatVersion(lines[0].split()[-1])
    settings['xcode_version_int'] = int(settings['xcode_version'], 10)
    settings['xcode_build'] = lines[-1].split()[-1]


def FillMachineOSBuild(settings):
    """Fills OS build number into |settings|."""
    machine_os_build = subprocess.check_output(['sw_vers', '-buildVersion'
                                               ]).decode('UTF-8').strip()
    settings['machine_os_build'] = machine_os_build


def FillSDKPathAndVersion(settings, platform, xcode_version):
    """Fills the SDK path and version for |platform| into |settings|."""
    settings['sdk_path'] = subprocess.check_output(
        ['xcrun', '-sdk', platform, '--show-sdk-path']).decode('UTF-8').strip()
    settings['sdk_version'] = subprocess.check_output(
        ['xcrun', '-sdk', platform,
         '--show-sdk-version']).decode('UTF-8').strip()
    settings['sdk_platform_path'] = subprocess.check_output(
        ['xcrun', '-sdk', platform,
         '--show-sdk-platform-path']).decode('UTF-8').strip()
    settings['sdk_build'] = subprocess.check_output(
        ['xcrun', '-sdk', platform,
         '--show-sdk-build-version']).decode('UTF-8').strip()
    settings['toolchains_path'] = os.path.join(
        subprocess.check_output(['xcode-select',
                                 '-print-path']).decode('UTF-8').strip(),
        'Toolchains/XcodeDefault.xctoolchain')


def CreateXcodeSymlinkAt(src, dst):
    """Create symlink to Xcode directory at target location."""

    if not os.path.isdir(dst):
        os.makedirs(dst)

    dst = os.path.join(dst, os.path.basename(src))
    updated_value = '//' + os.path.relpath(dst, ROOT_SRC_DIR)

    # Update the symlink only if it is different from the current destination.
    if os.path.islink(dst):
        current_src = os.readlink(dst)
        if current_src == src:
            return updated_value
        os.unlink(dst)
        sys.stderr.write('existing symlink %s points %s; want %s. Removed.' %
                         (dst, current_src, src))
    os.symlink(src, dst)
    return updated_value


if __name__ == '__main__':
    doctest.testmod()

    parser = argparse.ArgumentParser()
    parser.add_argument("--developer_dir", dest="developer_dir", required=False)
    parser.add_argument("--get_sdk_info",
                        action="store_true",
                        dest="get_sdk_info",
                        default=False,
                        help="Returns SDK info in addition to xcode info.")
    parser.add_argument("--get_machine_info",
                        action="store_true",
                        dest="get_machine_info",
                        default=False,
                        help="Returns machine info in addition to xcode info.")
    parser.add_argument("--create_symlink_at",
                        action="store",
                        dest="create_symlink_at",
                        help="Create symlink of SDK at given location and "
                        "returns the symlinked paths as SDK info instead "
                        "of the original location.")
    args, unknownargs = parser.parse_known_args()
    if args.developer_dir:
        os.environ['DEVELOPER_DIR'] = args.developer_dir

    if len(unknownargs) != 1:
        sys.stderr.write('usage: %s [iphoneos|iphonesimulator|macosx]\n' %
                         os.path.basename(sys.argv[0]))
        sys.exit(1)

    settings = {}
    FillMachineOSBuild(settings)
    FillXcodeVersion(settings, args.developer_dir)
    if args.get_sdk_info:
        FillSDKPathAndVersion(settings, unknownargs[0],
                              settings['xcode_version'])

    for key in sorted(settings):
        value = settings[key]
        if args.create_symlink_at and '_path' in key:
            value = CreateXcodeSymlinkAt(value, args.create_symlink_at)
        if isinstance(value, basestring_compat):
            value = '"%s"' % value
        print('%s=%s' % (key, value))
