#
# Copyright 2023 Picovoice Inc.
#
# You may not use this file except in compliance with the license. A copy of the license is located in the "LICENSE"
# file accompanying this source.
#
# 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
import platform
import subprocess


def _is_64bit():
    return '64bit' in platform.architecture()[0]


def _linux_machine() -> str:
    machine = platform.machine()
    if machine == 'x86_64':
        return machine
    elif machine in ['aarch64', 'armv7l']:
        arch_info = ('-' + machine) if _is_64bit() else ''
    else:
        raise NotImplementedError("Unsupported CPU architecture: `%s`" % machine)

    cpu_info = ''
    try:
        cpu_info = subprocess.check_output(['cat', '/proc/cpuinfo']).decode('utf-8')
        cpu_part_list = [x for x in cpu_info.split('\n') if 'CPU part' in x]
        cpu_part = cpu_part_list[0].split(' ')[-1].lower()
    except Exception as e:
        raise RuntimeError("Failed to identify the CPU with `%s`\nCPU info: `%s`" % (e, cpu_info))

    if '0xd03' == cpu_part:
        return 'cortex-a53' + arch_info
    elif '0xd07' == cpu_part:
        return 'cortex-a57' + arch_info
    elif '0xd08' == cpu_part:
        return 'cortex-a72' + arch_info
    elif "0xd0b" == cpu_part:
        return "cortex-a76" + arch_info
    else:
        raise NotImplementedError("Unsupported CPU: `%s`." % cpu_part)


_RASPBERRY_PI_MACHINES = {
    "cortex-a53",
    "cortex-a72",
    "cortex-a76",
    "cortex-a53-aarch64",
    "cortex-a72-aarch64",
    "cortex-a76-aarch64"}


def default_library_path(relative: str = '') -> str:
    if platform.system() == 'Darwin':
        if platform.machine() == 'x86_64':
            return os.path.join(os.path.dirname(__file__), relative, 'lib/mac/x86_64/libpv_koala.dylib')
        elif platform.machine() == "arm64":
            return os.path.join(os.path.dirname(__file__), relative, 'lib/mac/arm64/libpv_koala.dylib')
    elif platform.system() == 'Linux':
        linux_machine = _linux_machine()
        if linux_machine == 'x86_64':
            return os.path.join(os.path.dirname(__file__), relative, 'lib/linux/x86_64/libpv_koala.so')
        elif linux_machine in _RASPBERRY_PI_MACHINES:
            return os.path.join(
                os.path.dirname(__file__),
                relative,
                'lib/raspberry-pi/%s/libpv_koala.so' % linux_machine)
    elif platform.system() == 'Windows':
        if platform.machine().lower() == 'amd64':
            return os.path.join(os.path.dirname(__file__), relative, 'lib/windows/amd64/libpv_koala.dll')
        elif platform.machine().lower() == 'arm64':
            return os.path.join(os.path.dirname(__file__), relative, 'lib/windows/arm64/libpv_koala.dll')

    raise NotImplementedError('Unsupported platform.')


def default_model_path(relative: str = '') -> str:
    return os.path.join(os.path.dirname(__file__), relative, 'lib/common/koala_params.pv')


__all__ = ['default_library_path', 'default_model_path']