# Copyright (c) 2021 Project CHIP Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os
from enum import Enum, auto
from platform import uname
from typing import Optional

from .builder import BuilderOutput
from .gn import GnBuilder


class HostCryptoLibrary(Enum):
    """Defines what cryptographic backend applications should use."""
    OPENSSL = auto()
    MBEDTLS = auto()
    BORINGSSL = auto()

    @property
    def gn_argument(self):
        if self == HostCryptoLibrary.OPENSSL:
            return 'chip_crypto="openssl"'
        elif self == HostCryptoLibrary.MBEDTLS:
            return 'chip_crypto="mbedtls"'
        elif self == HostCryptoLibrary.BORINGSSL:
            return 'chip_crypto="boringssl"'


class HostFuzzingType(Enum):
    """Defines fuzz target options available for host targets."""
    NONE = auto()
    LIB_FUZZER = auto()
    OSS_FUZZ = auto()
    PW_FUZZTEST = auto()


class HostApp(Enum):
    ALL_CLUSTERS = auto()
    ALL_CLUSTERS_MINIMAL = auto()
    CHIP_TOOL = auto()
    CHIP_TOOL_DARWIN = auto()
    THERMOSTAT = auto()
    RPC_CONSOLE = auto()
    MIN_MDNS = auto()
    ADDRESS_RESOLVE = auto()
    TV_APP = auto()
    TV_CASTING_APP = auto()
    LIGHT = auto()
    LIGHT_DATA_MODEL_NO_UNIQUE_ID = auto()
    LOCK = auto()
    TESTS = auto()
    SHELL = auto()
    CERT_TOOL = auto()
    OTA_PROVIDER = auto()
    OTA_REQUESTOR = auto()
    SIMULATED_APP1 = auto()
    SIMULATED_APP2 = auto()
    PYTHON_BINDINGS = auto()
    EFR32_TEST_RUNNER = auto()
    TV_CASTING = auto()
    BRIDGE = auto()
    FABRIC_ADMIN = auto()
    FABRIC_BRIDGE = auto()
    FABRIC_SYNC = auto()
    JAVA_MATTER_CONTROLLER = auto()
    KOTLIN_MATTER_CONTROLLER = auto()
    CONTACT_SENSOR = auto()
    DISHWASHER = auto()
    MICROWAVE_OVEN = auto()
    REFRIGERATOR = auto()
    RVC = auto()
    AIR_PURIFIER = auto()
    LIT_ICD = auto()
    AIR_QUALITY_SENSOR = auto()
    NETWORK_MANAGER = auto()
    ENERGY_MANAGEMENT = auto()
    WATER_LEAK_DETECTOR = auto()

    def ExamplePath(self):
        if self == HostApp.ALL_CLUSTERS:
            return 'all-clusters-app/linux'
        elif self == HostApp.ALL_CLUSTERS_MINIMAL:
            return 'all-clusters-minimal-app/linux'
        elif self == HostApp.CHIP_TOOL:
            return 'chip-tool'
        elif self == HostApp.CHIP_TOOL_DARWIN:
            return 'darwin-framework-tool'
        elif self == HostApp.THERMOSTAT:
            return 'thermostat/linux'
        elif self == HostApp.RPC_CONSOLE:
            return 'common/pigweed/rpc_console'
        elif self == HostApp.MIN_MDNS:
            return 'minimal-mdns'
        elif self == HostApp.TV_APP:
            return 'tv-app/linux'
        elif self == HostApp.TV_CASTING_APP:
            return 'tv-casting-app/linux'
        elif self == HostApp.LIGHT:
            return 'lighting-app/linux'
        elif self == HostApp.LIGHT_DATA_MODEL_NO_UNIQUE_ID:
            return 'lighting-app-data-mode-no-unique-id/linux'
        elif self == HostApp.LOCK:
            return 'lock-app/linux'
        elif self == HostApp.SHELL:
            return 'shell/standalone'
        elif self == HostApp.OTA_PROVIDER:
            return 'ota-provider-app/linux'
        elif self in [HostApp.SIMULATED_APP1, HostApp.SIMULATED_APP2]:
            return 'placeholder/linux/'
        elif self == HostApp.OTA_REQUESTOR:
            return 'ota-requestor-app/linux'
        elif self in [HostApp.ADDRESS_RESOLVE, HostApp.TESTS, HostApp.PYTHON_BINDINGS, HostApp.CERT_TOOL]:
            return '../'
        elif self == HostApp.EFR32_TEST_RUNNER:
            return '../src/test_driver/efr32'
        elif self == HostApp.TV_CASTING:
            return 'tv-casting-app/linux'
        elif self == HostApp.BRIDGE:
            return 'bridge-app/linux'
        elif self == HostApp.FABRIC_ADMIN:
            return 'fabric-admin'
        elif self == HostApp.FABRIC_BRIDGE:
            return 'fabric-bridge-app/linux'
        elif self == HostApp.FABRIC_SYNC:
            return 'fabric-sync'
        elif self == HostApp.JAVA_MATTER_CONTROLLER:
            return 'java-matter-controller'
        elif self == HostApp.KOTLIN_MATTER_CONTROLLER:
            return 'kotlin-matter-controller'
        elif self == HostApp.CONTACT_SENSOR:
            return 'contact-sensor-app/linux'
        elif self == HostApp.DISHWASHER:
            return 'dishwasher-app/linux'
        elif self == HostApp.MICROWAVE_OVEN:
            return 'microwave-oven-app/linux'
        elif self == HostApp.REFRIGERATOR:
            return 'refrigerator-app/linux'
        elif self == HostApp.RVC:
            return 'rvc-app/linux'
        elif self == HostApp.AIR_PURIFIER:
            return 'air-purifier-app/linux'
        elif self == HostApp.LIT_ICD:
            return 'lit-icd-app/linux'
        elif self == HostApp.AIR_QUALITY_SENSOR:
            return 'air-quality-sensor-app/linux'
        elif self == HostApp.NETWORK_MANAGER:
            return 'network-manager-app/linux'
        elif self == HostApp.ENERGY_MANAGEMENT:
            return 'energy-management-app/linux'
        elif self == HostApp.WATER_LEAK_DETECTOR:
            return 'water-leak-detector/linux'
        else:
            raise Exception('Unknown app type: %r' % self)

    def OutputNames(self):
        if self == HostApp.ALL_CLUSTERS:
            yield 'chip-all-clusters-app'
            yield 'chip-all-clusters-app.map'
        elif self == HostApp.ALL_CLUSTERS_MINIMAL:
            yield 'chip-all-clusters-minimal-app'
            yield 'chip-all-clusters-minimal-app.map'
        elif self == HostApp.CHIP_TOOL:
            yield 'chip-tool'
            yield 'chip-tool.map'
        elif self == HostApp.CHIP_TOOL_DARWIN:
            yield 'darwin-framework-tool'
            yield 'darwin-framework-tool.map'
        elif self == HostApp.THERMOSTAT:
            yield 'thermostat-app'
            yield 'thermostat-app.map'
        elif self == HostApp.RPC_CONSOLE:
            yield 'chip_rpc_console_wheels'
        elif self == HostApp.MIN_MDNS:
            yield 'mdns-advertiser'
            yield 'mdns-advertiser.map'
            yield 'minimal-mdns-client'
            yield 'minimal-mdns-client.map'
            yield 'minimal-mdns-server'
            yield 'minimal-mdns-server.map'
        elif self == HostApp.ADDRESS_RESOLVE:
            yield 'address-resolve-tool'
            yield 'address-resolve-tool.map'
        elif self == HostApp.TV_APP:
            yield 'chip-tv-app'
            yield 'chip-tv-app.map'
        elif self == HostApp.TV_CASTING_APP:
            yield 'chip-tv-casting-app'
            yield 'chip-tv-casting-app.map'
        elif self == HostApp.LIGHT or self == HostApp.LIGHT_DATA_MODEL_NO_UNIQUE_ID:
            yield 'chip-lighting-app'
            yield 'chip-lighting-app.map'
        elif self == HostApp.LOCK:
            yield 'chip-lock-app'
            yield 'chip-lock-app.map'
        elif self == HostApp.TESTS:
            pass
        elif self == HostApp.SHELL:
            yield 'chip-shell'
            yield 'chip-shell.map'
        elif self == HostApp.CERT_TOOL:
            yield 'chip-cert'
            yield 'chip-cert.map'
        elif self == HostApp.SIMULATED_APP1:
            yield 'chip-app1'
            yield 'chip-app1.map'
        elif self == HostApp.SIMULATED_APP2:
            yield 'chip-app2'
            yield 'chip-app2.map'
        elif self == HostApp.OTA_PROVIDER:
            yield 'chip-ota-provider-app'
            yield 'chip-ota-provider-app.map'
        elif self == HostApp.OTA_REQUESTOR:
            yield 'chip-ota-requestor-app'
            yield 'chip-ota-requestor-app.map'
        elif self == HostApp.PYTHON_BINDINGS:
            yield 'controller/python'  # Directory containing WHL files
        elif self == HostApp.EFR32_TEST_RUNNER:
            yield 'chip_pw_test_runner_wheels'
        elif self == HostApp.TV_CASTING:
            yield 'chip-tv-casting-app'
            yield 'chip-tv-casting-app.map'
        elif self == HostApp.BRIDGE:
            yield 'chip-bridge-app'
            yield 'chip-bridge-app.map'
        elif self == HostApp.FABRIC_ADMIN:
            yield 'fabric-admin'
            yield 'fabric-admin.map'
        elif self == HostApp.FABRIC_BRIDGE:
            yield 'fabric-bridge-app'
            yield 'fabric-bridge-app.map'
        elif self == HostApp.FABRIC_SYNC:
            yield 'fabric-sync'
            yield 'fabric-sync.map'
        elif self == HostApp.JAVA_MATTER_CONTROLLER:
            yield 'java-matter-controller'
            yield 'java-matter-controller.map'
        elif self == HostApp.KOTLIN_MATTER_CONTROLLER:
            yield 'kotlin-matter-controller'
            yield 'kotlin-matter-controller.map'
        elif self == HostApp.CONTACT_SENSOR:
            yield 'contact-sensor-app'
            yield 'contact-sensor-app.map'
        elif self == HostApp.DISHWASHER:
            yield 'dishwasher-app'
            yield 'dishwasher-app.map'
        elif self == HostApp.MICROWAVE_OVEN:
            yield 'chip-microwave-oven-app'
            yield 'chip-microwave-oven-app.map'
        elif self == HostApp.REFRIGERATOR:
            yield 'refrigerator-app'
            yield 'refrigerator-app.map'
        elif self == HostApp.RVC:
            yield 'chip-rvc-app'
            yield 'chip-rvc-app.map'
        elif self == HostApp.AIR_PURIFIER:
            yield 'air-purifier-app'
            yield 'air-purifier-app.map'
        elif self == HostApp.LIT_ICD:
            yield 'lit-icd-app'
            yield 'lit-icd-app.map'
        elif self == HostApp.NETWORK_MANAGER:
            yield 'matter-network-manager-app'
            yield 'matter-network-manager-app.map'
        elif self == HostApp.ENERGY_MANAGEMENT:
            yield 'chip-energy-management-app'
            yield 'chip-energy-management-app.map'
        elif self == HostApp.WATER_LEAK_DETECTOR:
            yield 'water-leak-detector-app'
            yield 'water-leak-detector-app.map'
        else:
            raise Exception('Unknown app type: %r' % self)


class HostBoard(Enum):
    NATIVE = auto()

    # cross-compile support
    ARM64 = auto()

    # for test support
    FAKE = auto()

    def BoardName(self):
        if self == HostBoard.NATIVE:
            uname_result = uname()
            arch = uname_result.machine

            # standardize some common platforms
            if arch == 'x86_64':
                arch = 'x64'
            elif arch == 'i386' or arch == 'i686':
                arch = 'x86'
            elif arch in ('aarch64', 'aarch64_be', 'armv8b', 'armv8l'):
                arch = 'arm64'

            return arch
        elif self == HostBoard.ARM64:
            return 'arm64'
        elif self == HostBoard.FAKE:
            return 'fake'
        else:
            raise Exception('Unknown host board type: %r' % self)

    def PlatformName(self):
        if self == HostBoard.NATIVE:
            return uname().system.lower()
        elif self == HostBoard.FAKE:
            return 'fake'
        else:
            # Cross compilation assumes linux currently
            return 'linux'


class HostBuilder(GnBuilder):

    def __init__(self, root, runner, app: HostApp, board=HostBoard.NATIVE,
                 enable_ipv4=True, enable_ble=True, enable_wifi=True,
                 enable_thread=True, use_tsan=False, use_asan=False, use_ubsan=False,
                 separate_event_loop=True, fuzzing_type: HostFuzzingType = HostFuzzingType.NONE, use_clang=False,
                 interactive_mode=True, extra_tests=False, use_nl_fault_injection=False, use_platform_mdns=False, enable_rpcs=False,
                 use_coverage=False, use_dmalloc=False, minmdns_address_policy=None,
                 minmdns_high_verbosity=False, imgui_ui=False, crypto_library: HostCryptoLibrary = None,
                 enable_test_event_triggers=None,
                 enable_dnssd_tests: Optional[bool] = None,
                 chip_casting_simplified: Optional[bool] = None,
                 data_model_interface: Optional[str] = None,
                 chip_data_model_check_die_on_failure: Optional[bool] = None,
                 disable_shell=False
                 ):
        super(HostBuilder, self).__init__(
            root=os.path.join(root, 'examples', app.ExamplePath()),
            runner=runner)

        self.app = app
        self.board = board
        self.extra_gn_options = []
        self.build_env = {}

        if enable_rpcs:
            self.extra_gn_options.append('import("//with_pw_rpc.gni")')

        if not enable_ipv4:
            self.extra_gn_options.append('chip_inet_config_enable_ipv4=false')

        if not enable_ble:
            self.extra_gn_options.append('chip_config_network_layer_ble=false')

        if not enable_wifi:
            self.extra_gn_options.append('chip_enable_wifi=false')

        if not enable_thread:
            self.extra_gn_options.append('chip_enable_openthread=false')

        if disable_shell:
            self.extra_gn_options.append('chip_build_libshell=false')

        if use_tsan:
            self.extra_gn_options.append('is_tsan=true')

        if use_asan:
            self.extra_gn_options.append('is_asan=true')

        if use_ubsan:
            self.extra_gn_options.append('is_ubsan=true')

        if data_model_interface is not None:
            self.extra_gn_options.append(f'chip_use_data_model_interface="{data_model_interface}"')

        if use_dmalloc:
            self.extra_gn_options.append('chip_config_memory_debug_checks=true')
            self.extra_gn_options.append('chip_config_memory_debug_dmalloc=true')

            # this is from `dmalloc -b -l DMALLOC_LOG -i 1 high`
            self.build_env['DMALLOC_OPTIONS'] = 'debug=0x4f4ed03,inter=1,log=DMALLOC_LOG'

            # glib interop with dmalloc
            self.build_env['G_SLICE'] = 'always-malloc'

        if not separate_event_loop:
            self.extra_gn_options.append('config_use_separate_eventloop=false')

        if not interactive_mode:
            self.extra_gn_options.append('config_use_interactive_mode=false')

        if fuzzing_type == HostFuzzingType.LIB_FUZZER:
            self.extra_gn_options.append('is_libfuzzer=true')
        elif fuzzing_type == HostFuzzingType.OSS_FUZZ:
            self.extra_gn_options.append('oss_fuzz=true')
        elif fuzzing_type == HostFuzzingType.PW_FUZZTEST:
            self.extra_gn_options.append('pw_enable_fuzz_test_targets=true')

        if imgui_ui:
            self.extra_gn_options.append('chip_examples_enable_imgui_ui=true')

        self.use_coverage = use_coverage
        if use_coverage:
            self.extra_gn_options.append('use_coverage=true')

        if use_clang:
            self.extra_gn_options.append('is_clang=true')

            if self.board == HostBoard.FAKE:
                # Fake uses "//build/toolchain/fake:fake_x64_gcc"
                # so setting clang is not correct
                raise Exception('Fake host board is always gcc (not clang)')

        if use_nl_fault_injection:
            self.extra_gn_options.append('chip_with_nlfaultinjection=true')

        if minmdns_address_policy:
            if use_platform_mdns:
                raise Exception('Address policy applies to minmdns only')
            self.extra_gn_options.append('chip_minmdns_default_policy="%s"' % minmdns_address_policy)

        if use_platform_mdns:
            self.extra_gn_options.append('chip_mdns="platform"')

        if extra_tests:
            # Flag for testing purpose
            self.extra_gn_options.append(
                'chip_im_force_fabric_quota_check=true')

        if minmdns_high_verbosity:
            self.extra_gn_options.append('chip_minmdns_high_verbosity=true')

        if app == HostApp.TESTS:
            self.extra_gn_options.append('chip_build_tests=true')
            self.extra_gn_options.append('chip_data_model_check_die_on_failure=true')
            self.build_command = 'check'
        elif chip_data_model_check_die_on_failure is not None:
            if chip_data_model_check_die_on_failure:
                self.extra_gn_options.append('chip_data_model_check_die_on_failure=true')
            else:
                self.extra_gn_options.append('chip_data_model_check_die_on_failure=false')

        if app == HostApp.EFR32_TEST_RUNNER:
            self.build_command = 'runner'
            # board will NOT be used, but is required to be able to properly
            # include things added by the test_runner efr32 build
            self.extra_gn_options.append('silabs_board="BRD4187C"')

        # Crypto library has per-platform defaults (like openssl for linux/mac
        # and mbedtls for android/freertos/zephyr/mbed/...)
        if crypto_library:
            self.extra_gn_options.append(crypto_library.gn_argument)

        if enable_test_event_triggers is not None:
            if 'EVSE' in enable_test_event_triggers:
                self.extra_gn_options.append('chip_enable_energy_evse_trigger=true')

        if enable_dnssd_tests is not None:
            if enable_dnssd_tests:
                self.extra_gn_options.append('chip_enable_dnssd_tests=true')
            else:
                self.extra_gn_options.append('chip_enable_dnssd_tests=false')

        if chip_casting_simplified is not None:
            self.extra_gn_options.append(f'chip_casting_simplified={str(chip_casting_simplified).lower()}')

        if self.board == HostBoard.ARM64:
            if not use_clang:
                raise Exception("Cross compile only supported using clang")

        if app == HostApp.CERT_TOOL:
            # Certification only built for openssl
            if self.board == HostBoard.ARM64 and crypto_library == HostCryptoLibrary.MBEDTLS:
                raise Exception("MbedTLS not supported for cross compiling cert tool")
            self.build_command = 'src/tools/chip-cert'
        elif app == HostApp.ADDRESS_RESOLVE:
            self.build_command = 'src/lib/address_resolve:address-resolve-tool'
        elif app == HostApp.PYTHON_BINDINGS:
            self.extra_gn_options.append('enable_rtti=false')
            self.extra_gn_options.append('chip_project_config_include_dirs=["//config/python"]')
            self.build_command = 'chip-repl'

        if self.app == HostApp.SIMULATED_APP1:
            self.extra_gn_options.append('chip_tests_zap_config="app1"')

        if self.app == HostApp.SIMULATED_APP2:
            self.extra_gn_options.append('chip_tests_zap_config="app2"')

        if self.app == HostApp.TESTS and fuzzing_type != HostFuzzingType.NONE:
            self.build_command = 'fuzz_tests'

        if self.app == HostApp.TESTS and fuzzing_type == HostFuzzingType.PW_FUZZTEST:
            self.build_command = 'pw_fuzz_tests'

    def GnBuildArgs(self):
        if self.board == HostBoard.NATIVE:
            return self.extra_gn_options
        elif self.board == HostBoard.ARM64:
            self.extra_gn_options.extend(
                [
                    'target_cpu="arm64"',
                    'sysroot="%s"' % self.SysRootPath('SYSROOT_AARCH64')
                ]
            )

            return self.extra_gn_options
        elif self.board == HostBoard.FAKE:
            self.extra_gn_options.extend(
                [
                    'custom_toolchain="//build/toolchain/fake:fake_x64_gcc"',
                    'chip_link_tests=true',
                    'chip_device_platform="fake"',
                    'chip_fake_platform=true',
                ]
            )
            return self.extra_gn_options
        else:
            raise Exception('Unknown host board type: %r' % self)

    def createJavaExecutable(self, java_program):
        self._Execute(
            [
                "chmod",
                "+x",
                "%s/bin/%s" % (self.output_dir, java_program),
            ],
            title="Make Java program executable",
        )

    def GnBuildEnv(self):
        if self.board == HostBoard.ARM64:
            self.build_env['PKG_CONFIG_PATH'] = os.path.join(
                self.SysRootPath('SYSROOT_AARCH64'), 'lib/aarch64-linux-gnu/pkgconfig')
        return self.build_env

    def SysRootPath(self, name):
        if name not in os.environ:
            raise Exception('Missing environment variable "%s"' % name)
        return os.environ[name]

    def generate(self):
        super(HostBuilder, self).generate()
        if 'JAVA_PATH' in os.environ:
            self._Execute(
                ["third_party/java_deps/set_up_java_deps.sh"],
                title="Setting up Java deps",
            )

            exampleName = self.app.ExamplePath()
            if exampleName == "java-matter-controller":
                self._Execute(
                    [
                        "cp",
                        os.path.join(self.root, "Manifest.txt"),
                        self.output_dir,
                    ],
                    title="Copying Manifest.txt to " + self.output_dir,
                )
            if exampleName == "kotlin-matter-controller":
                self._Execute(
                    [
                        "cp",
                        os.path.join(self.root, "Manifest.txt"),
                        self.output_dir,
                    ],
                    title="Copying Manifest.txt to " + self.output_dir,
                )

        if self.app == HostApp.TESTS and self.use_coverage:
            self.coverage_dir = os.path.join(self.output_dir, 'coverage')
            self._Execute(['mkdir', '-p', self.coverage_dir], title="Create coverage output location")

    def PreBuildCommand(self):
        if self.app == HostApp.TESTS and self.use_coverage:
            cmd = ['ninja', '-C', self.output_dir]

            if self.ninja_jobs is not None:
                cmd.append('-j' + str(self.ninja_jobs))

            cmd.append('default')

            self._Execute(cmd, title="Build-only")
            self._Execute(['lcov', '--initial', '--capture', '--directory', os.path.join(self.output_dir, 'obj'),
                           '--exclude', os.path.join(self.chip_dir, '**/tests/*'),
                           '--exclude', os.path.join(self.chip_dir, 'zzz_generated/*'),
                           '--exclude', os.path.join(self.chip_dir, 'third_party/*'),
                           '--exclude', os.path.join(self.chip_dir, 'out/*'),
                           '--exclude', '/usr/include/*',
                           '--output-file', os.path.join(self.coverage_dir, 'lcov_base.info')], title="Initial coverage baseline")

    def PostBuildCommand(self):
        if self.app == HostApp.TESTS and self.use_coverage:
            self._Execute(['lcov', '--capture', '--directory', os.path.join(self.output_dir, 'obj'),
                           '--exclude', os.path.join(self.chip_dir, '**/tests/*'),
                           '--exclude', os.path.join(self.chip_dir, 'zzz_generated/*'),
                           '--exclude', os.path.join(self.chip_dir, 'third_party/*'),
                           '--exclude', os.path.join(self.chip_dir, 'out/*'),
                           '--exclude', '/usr/include/*',
                           '--output-file', os.path.join(self.coverage_dir, 'lcov_test.info')], title="Update coverage")
            self._Execute(['lcov', '--add-tracefile', os.path.join(self.coverage_dir, 'lcov_base.info'),
                           '--add-tracefile', os.path.join(self.coverage_dir, 'lcov_test.info'),
                           '--output-file', os.path.join(self.coverage_dir, 'lcov_final.info')
                           ], title="Final coverage info")
            self._Execute(['genhtml', os.path.join(self.coverage_dir, 'lcov_final.info'), '--output-directory',
                           os.path.join(self.coverage_dir, 'html')], title="HTML coverage")

        if self.app == HostApp.JAVA_MATTER_CONTROLLER:
            self.createJavaExecutable("java-matter-controller")

        if self.app == HostApp.KOTLIN_MATTER_CONTROLLER:
            self.createJavaExecutable("kotlin-matter-controller")

    def build_outputs(self):
        for name in self.app.OutputNames():
            if not self.options.enable_link_map_file and name.endswith(".map"):
                continue
            path = os.path.join(self.output_dir, name)
            if os.path.isdir(path):
                for root, dirs, files in os.walk(path):
                    for file in files:
                        yield BuilderOutput(os.path.join(root, file), file)
            else:
                yield BuilderOutput(os.path.join(self.output_dir, name), name)