import os


verbose = False


def find_nuget_unix():
    import os

    if 'NUGET_PATH' in os.environ:
        hint_path = os.environ['NUGET_PATH']
        if os.path.isfile(hint_path) and os.access(hint_path, os.X_OK):
            return hint_path
        hint_path = os.path.join(hint_path, 'nuget')
        if os.path.isfile(hint_path) and os.access(hint_path, os.X_OK):
            return hint_path

    import os.path
    import sys

    hint_dirs = ['/opt/novell/mono/bin']
    if sys.platform == 'darwin':
        hint_dirs = ['/Library/Frameworks/Mono.framework/Versions/Current/bin', '/usr/local/var/homebrew/linked/mono/bin'] + hint_dirs

    for hint_dir in hint_dirs:
        hint_path = os.path.join(hint_dir, 'nuget')
        if os.path.isfile(hint_path):
            return hint_path
        elif os.path.isfile(hint_path + '.exe'):
            return hint_path + '.exe'

    for hint_dir in os.environ['PATH'].split(os.pathsep):
        hint_dir = hint_dir.strip('"')
        hint_path = os.path.join(hint_dir, 'nuget')
        if os.path.isfile(hint_path) and os.access(hint_path, os.X_OK):
            return hint_path
        if os.path.isfile(hint_path + '.exe') and os.access(hint_path + '.exe', os.X_OK):
            return hint_path + '.exe'

    return None


def find_nuget_windows(env):
    import os

    if 'NUGET_PATH' in os.environ:
        hint_path = os.environ['NUGET_PATH']
        if os.path.isfile(hint_path) and os.access(hint_path, os.X_OK):
            return hint_path
        hint_path = os.path.join(hint_path, 'nuget.exe')
        if os.path.isfile(hint_path) and os.access(hint_path, os.X_OK):
            return hint_path

    from . mono_reg_utils import find_mono_root_dir

    mono_root = env['mono_prefix'] or find_mono_root_dir(env['bits'])

    if mono_root:
        mono_bin_dir = os.path.join(mono_root, 'bin')
        nuget_mono = os.path.join(mono_bin_dir, 'nuget.bat')

        if os.path.isfile(nuget_mono):
            return nuget_mono

    # Standalone NuGet

    for hint_dir in os.environ['PATH'].split(os.pathsep):
        hint_dir = hint_dir.strip('"')
        hint_path = os.path.join(hint_dir, 'nuget.exe')
        if os.path.isfile(hint_path) and os.access(hint_path, os.X_OK):
            return hint_path

    return None


def find_msbuild_unix(filename):
    import os.path
    import sys

    hint_dirs = ['/opt/novell/mono/bin']
    if sys.platform == 'darwin':
        hint_dirs = ['/Library/Frameworks/Mono.framework/Versions/Current/bin', '/usr/local/var/homebrew/linked/mono/bin'] + hint_dirs

    for hint_dir in hint_dirs:
        hint_path = os.path.join(hint_dir, filename)
        if os.path.isfile(hint_path):
            return hint_path
        elif os.path.isfile(hint_path + '.exe'):
            return hint_path + '.exe'

    for hint_dir in os.environ['PATH'].split(os.pathsep):
        hint_dir = hint_dir.strip('"')
        hint_path = os.path.join(hint_dir, filename)
        if os.path.isfile(hint_path) and os.access(hint_path, os.X_OK):
            return hint_path
        if os.path.isfile(hint_path + '.exe') and os.access(hint_path + '.exe', os.X_OK):
            return hint_path + '.exe'

    return None


def find_msbuild_windows(env):
    from . mono_reg_utils import find_mono_root_dir, find_msbuild_tools_path_reg

    mono_root = env['mono_prefix'] or find_mono_root_dir(env['bits'])

    if not mono_root:
        raise RuntimeError('Cannot find mono root directory')

    framework_path = os.path.join(mono_root, 'lib', 'mono', '4.5')
    mono_bin_dir = os.path.join(mono_root, 'bin')
    msbuild_mono = os.path.join(mono_bin_dir, 'msbuild.bat')

    if os.path.isfile(msbuild_mono):
        # The (Csc/Vbc/Fsc)ToolExe environment variables are required when
        # building with Mono's MSBuild. They must point to the batch files
        # in Mono's bin directory to make sure they are executed with Mono.
        mono_msbuild_env = {
            'CscToolExe': os.path.join(mono_bin_dir, 'csc.bat'),
            'VbcToolExe': os.path.join(mono_bin_dir, 'vbc.bat'),
            'FscToolExe': os.path.join(mono_bin_dir, 'fsharpc.bat')
        }
        return (msbuild_mono, framework_path, mono_msbuild_env)

    msbuild_tools_path = find_msbuild_tools_path_reg()

    if msbuild_tools_path:
        return (os.path.join(msbuild_tools_path, 'MSBuild.exe'), framework_path, {})

    return None


def run_command(command, args, env_override=None, name=None):
    def cmd_args_to_str(cmd_args):
        return ' '.join([arg if not ' ' in arg else '"%s"' % arg for arg in cmd_args])

    args = [command] + args

    if name is None:
        name = os.path.basename(command)

    if verbose:
        print("Running '%s': %s" % (name, cmd_args_to_str(args)))

    import subprocess
    try:
        if env_override is None:
            subprocess.check_call(args)
        else:
            subprocess.check_call(args, env=env_override)
    except subprocess.CalledProcessError as e:
        raise RuntimeError("'%s' exited with error code: %s" % (name, e.returncode))


def nuget_restore(env, *args):
    global verbose
    verbose = env['verbose']

    # Find NuGet
    nuget_path = find_nuget_windows(env) if os.name == 'nt' else find_nuget_unix()
    if nuget_path is None:
        raise RuntimeError('Cannot find NuGet executable')

    print('NuGet path: ' + nuget_path)

    # Do NuGet restore
    run_command(nuget_path, ['restore'] + list(args), name='nuget restore')


def build_solution(env, solution_path, build_config, extra_msbuild_args=[]):
    global verbose
    verbose = env['verbose']

    framework_path = ''
    msbuild_env = os.environ.copy()

    # Needed when running from Developer Command Prompt for VS
    if 'PLATFORM' in msbuild_env:
        del msbuild_env['PLATFORM']

    # Find MSBuild
    if os.name == 'nt':
        msbuild_info = find_msbuild_windows(env)
        if msbuild_info is None:
            raise RuntimeError('Cannot find MSBuild executable')
        msbuild_path = msbuild_info[0]
        framework_path = msbuild_info[1]
        msbuild_env.update(msbuild_info[2])
    else:
        msbuild_path = find_msbuild_unix('msbuild')
        if msbuild_path is None:
            xbuild_fallback = env['xbuild_fallback']

            if xbuild_fallback and os.name == 'nt':
                print('Option \'xbuild_fallback\' not supported on Windows')
                xbuild_fallback = False

            if xbuild_fallback:
                print('Cannot find MSBuild executable, trying with xbuild')
                print('Warning: xbuild is deprecated')

                msbuild_path = find_msbuild_unix('xbuild')

                if msbuild_path is None:
                    raise RuntimeError('Cannot find xbuild executable')
            else:
                raise RuntimeError('Cannot find MSBuild executable')

    print('MSBuild path: ' + msbuild_path)

    # Build solution

    msbuild_args = [solution_path, '/p:Configuration=' + build_config]
    msbuild_args += ['/p:FrameworkPathOverride=' + framework_path] if framework_path else []
    msbuild_args += extra_msbuild_args

    run_command(msbuild_path, msbuild_args, env_override=msbuild_env, name='msbuild')