import copy
import glob
import os
import os.path
import re
import shutil


def action_extensions(base_actions, project_path=os.getcwd()):
    """ Describes extensions for unit tests. This function expects that actions "all" and "reconfigure" """

    PROJECT_NAME = 'unit-test-app'

    # List of unit-test-app configurations.
    # Each file in configs/ directory defines a configuration. The format is the
    # same as sdkconfig file. Configuration is applied on top of sdkconfig.defaults
    # file from the project directory
    CONFIG_NAMES = os.listdir(os.path.join(project_path, 'configs'))

    # Build (intermediate) and output (artifact) directories
    BUILDS_DIR = os.path.join(project_path, 'builds')
    BINARIES_DIR = os.path.join(project_path, 'output')

    def parse_file_to_dict(path, regex):
        """
        Parse the config file at 'path'

        Returns a dict of name:value.
        """
        compiled_regex = re.compile(regex)
        result = {}
        with open(path) as f:
            for line in f:
                m = compiled_regex.match(line)
                if m:
                    result[m.group(1)] = m.group(2)
        return result

    def parse_config(path):
        """
        Expected format with default regex is "key=value"
        """

        return parse_file_to_dict(path, r'^([^=]+)=(.+)$')

    def ut_apply_config(ut_apply_config_name, ctx, args):
        config_name = re.match(r'ut-apply-config-(.*)', ut_apply_config_name).group(1)
        # Make sure that define_cache_entry is list
        args.define_cache_entry = list(args.define_cache_entry)
        new_cache_values = {}
        sdkconfig_set = list(filter(lambda s: 'SDKCONFIG=' in s, args.define_cache_entry))
        sdkconfig_path = os.path.join(args.project_dir, 'sdkconfig')

        if sdkconfig_set:
            sdkconfig_path = sdkconfig_set[-1].split('=')[1]
            sdkconfig_path = os.path.abspath(sdkconfig_path)

        try:
            os.remove(sdkconfig_path)
        except OSError:
            pass

        if config_name in CONFIG_NAMES:
            # Parse the sdkconfig for components to be included/excluded and tests to be run
            config_path = os.path.join(project_path, 'configs', config_name)
            config = parse_config(config_path)

            target = config.get('CONFIG_IDF_TARGET', 'esp32').strip("'").strip('"')

            print('Reconfigure: config %s, target %s' % (config_name, target))

            # Clean up and set idf-target
            base_actions['actions']['fullclean']['callback']('fullclean', ctx, args)

            new_cache_values['EXCLUDE_COMPONENTS'] = config.get('EXCLUDE_COMPONENTS', "''")
            new_cache_values['TEST_EXCLUDE_COMPONENTS'] = config.get('TEST_EXCLUDE_COMPONENTS', "''")
            new_cache_values['TEST_COMPONENTS'] = config.get('TEST_COMPONENTS', "''")
            new_cache_values['TESTS_ALL'] = int(new_cache_values['TEST_COMPONENTS'] == "''")
            new_cache_values['IDF_TARGET'] = target
            new_cache_values['SDKCONFIG_DEFAULTS'] = ';'.join([os.path.join(project_path, 'sdkconfig.defaults'), config_path])

            args.define_cache_entry.extend(['%s=%s' % (k, v) for k, v in new_cache_values.items()])

            reconfigure = base_actions['actions']['reconfigure']['callback']
            reconfigure(None, ctx, args)

    # This target builds the configuration. It does not currently track dependencies,
    # but is good enough for CI builds if used together with clean-all-configs.
    # For local builds, use 'apply-config-NAME' target and then use normal 'all'
    # and 'flash' targets.
    def ut_build(ut_build_name, ctx, args):
        # Create a copy of the passed arguments to prevent arg modifications to accrue if
        # all configs are being built
        build_args = copy.copy(args)

        config_name = re.match(r'ut-build-(.*)', ut_build_name).group(1)

        if config_name in CONFIG_NAMES:
            build_args.build_dir = os.path.join(BUILDS_DIR, config_name)

            src = os.path.join(BUILDS_DIR, config_name)
            dest = os.path.join(BINARIES_DIR, config_name)

            try:
                os.makedirs(dest)
            except OSError:
                pass

            # Build, tweaking paths to sdkconfig and sdkconfig.defaults
            ut_apply_config('ut-apply-config-' + config_name, ctx, build_args)

            build_target = base_actions['actions']['all']['callback']

            build_target('all', ctx, build_args)

            # Copy artifacts to the output directory
            shutil.copyfile(
                os.path.join(build_args.project_dir, 'sdkconfig'),
                os.path.join(dest, 'sdkconfig'),
            )

            binaries = [PROJECT_NAME + x for x in ['.elf', '.bin', '.map']]

            for binary in binaries:
                shutil.copyfile(os.path.join(src, binary), os.path.join(dest, binary))

            try:
                os.mkdir(os.path.join(dest, 'bootloader'))
            except OSError:
                pass

            shutil.copyfile(
                os.path.join(src, 'bootloader', 'bootloader.bin'),
                os.path.join(dest, 'bootloader', 'bootloader.bin'),
            )

            for partition_table in glob.glob(os.path.join(src, 'partition_table', 'partition-table*.bin')):
                try:
                    os.mkdir(os.path.join(dest, 'partition_table'))
                except OSError:
                    pass
                shutil.copyfile(
                    partition_table,
                    os.path.join(dest, 'partition_table', os.path.basename(partition_table)),
                )

            shutil.copyfile(
                os.path.join(src, 'flasher_args.json'),
                os.path.join(dest, 'flasher_args.json'),
            )

            binaries = glob.glob(os.path.join(src, '*.bin'))
            binaries = [os.path.basename(s) for s in binaries]

            for binary in binaries:
                shutil.copyfile(os.path.join(src, binary), os.path.join(dest, binary))

    def ut_clean(ut_clean_name, ctx, args):
        config_name = re.match(r'ut-clean-(.*)', ut_clean_name).group(1)
        if config_name in CONFIG_NAMES:
            shutil.rmtree(os.path.join(BUILDS_DIR, config_name), ignore_errors=True)
            shutil.rmtree(os.path.join(BINARIES_DIR, config_name), ignore_errors=True)

    def test_component_callback(ctx, global_args, tasks):
        """ Convert the values passed to the -T and -E parameter to corresponding cache entry definitions TESTS_ALL and TEST_COMPONENTS """
        test_components = global_args.test_components
        test_exclude_components = global_args.test_exclude_components

        cache_entries = {}

        if test_components:
            if 'all' in test_components:
                cache_entries['TESTS_ALL'] = 1
                cache_entries['TEST_COMPONENTS'] = "''"
            else:
                cache_entries['TESTS_ALL'] = 0
                cache_entries['TEST_COMPONENTS'] = ' '.join(test_components)

        if test_exclude_components:
            cache_entries['TEST_EXCLUDE_COMPONENTS'] = ' '.join(test_exclude_components)

        if cache_entries:
            global_args.define_cache_entry = list(global_args.define_cache_entry)
            global_args.define_cache_entry.extend(['%s=%s' % (k, v) for k, v in cache_entries.items()])

    # Add global options
    extensions = {
        'global_options': [{
            'names': ['-T', '--test-components'],
            'help': 'Specify the components to test.',
            'scope': 'shared',
            'multiple': True,
        }, {
            'names': ['-E', '--test-exclude-components'],
            'help': 'Specify the components to exclude from testing.',
            'scope': 'shared',
            'multiple': True,
        }],
        'global_action_callbacks': [test_component_callback],
        'actions': {},
    }

    # This generates per-config targets (clean, build, apply-config).
    build_all_config_deps = []
    clean_all_config_deps = []

    for config in CONFIG_NAMES:
        config_build_action_name = 'ut-build-' + config
        config_clean_action_name = 'ut-clean-' + config
        config_apply_config_action_name = 'ut-apply-config-' + config

        extensions['actions'][config_build_action_name] = {
            'callback':
            ut_build,
            'help':
            'Build unit-test-app with configuration provided in configs/NAME. ' +
            'Build directory will be builds/%s/, ' % config_build_action_name +
            'output binaries will be under output/%s/' % config_build_action_name,
        }

        extensions['actions'][config_clean_action_name] = {
            'callback': ut_clean,
            'help': 'Remove build and output directories for configuration %s.' % config_clean_action_name,
        }

        extensions['actions'][config_apply_config_action_name] = {
            'callback':
            ut_apply_config,
            'help':
            'Generates configuration based on configs/%s in sdkconfig file.' % config_apply_config_action_name +
            'After this, normal all/flash targets can be used. Useful for development/debugging.',
        }

        build_all_config_deps.append(config_build_action_name)
        clean_all_config_deps.append(config_clean_action_name)

    extensions['actions']['ut-build-all-configs'] = {
        'callback': ut_build,
        'help': 'Build all configurations defined in configs/ directory.',
        'dependencies': build_all_config_deps,
    }

    extensions['actions']['ut-clean-all-configs'] = {
        'callback': ut_clean,
        'help': 'Remove build and output directories for all configurations defined in configs/ directory.',
        'dependencies': clean_all_config_deps,
    }

    return extensions