import os
import logging
from pathlib import Path
from shutil import copytree, rmtree

from g import internal_tls_dir, DEFAULT_GID, DEFAULT_UID, PG_GID, PG_UID
from utils.misc import check_permission, owner_can_read, get_realpath, port_number_valid
from utils.cert import san_existed

class InternalTLS:

    harbor_certs_filename = {
        'harbor_internal_ca.crt',
        'proxy.crt', 'proxy.key',
        'core.crt', 'core.key',
        'job_service.crt', 'job_service.key',
        'registryctl.crt', 'registryctl.key',
        'registry.crt', 'registry.key',
        'portal.crt', 'portal.key'
    }

    trivy_certs_filename = {
        'trivy_adapter.crt', 'trivy_adapter.key',
    }

    notary_certs_filename = {
        'notary_signer.crt', 'notary_signer.key',
        'notary_server.crt', 'notary_server.key'
    }

    chart_museum_filename = {
        'chartmuseum.crt',
        'chartmuseum.key'
    }

    db_certs_filename = {
        'harbor_db.crt', 'harbor_db.key'
    }

    def __init__(self, tls_enabled=False, verify_client_cert=False, tls_dir='', data_volume='', **kwargs):
        self.data_volume = data_volume
        self.verify_client_cert = verify_client_cert
        self.enabled = tls_enabled
        self.tls_dir = tls_dir
        if self.enabled:
            self.required_filenames = self.harbor_certs_filename
            if kwargs.get('with_notary'):
                self.required_filenames.update(self.notary_certs_filename)
            if kwargs.get('with_chartmuseum'):
                self.required_filenames.update(self.chart_museum_filename)
            if kwargs.get('with_trivy'):
                self.required_filenames.update(self.trivy_certs_filename)
            if not kwargs.get('external_database'):
                self.required_filenames.update(self.db_certs_filename)

    def __getattribute__(self, name: str):
        """
        Make the call like 'internal_tls.core_crt_path' possible
        """
        # only handle when enabled tls and name ends with 'path'
        if name.endswith('_path'):
            if not (self.enabled):
                return object.__getattribute__(self, name)

            name_parts = name.split('_')
            if len(name_parts) < 3:
                return object.__getattribute__(self, name)

            filename = '{}.{}'.format('_'.join(name_parts[:-2]), name_parts[-2])

            if filename in self.required_filenames:
                return os.path.join(self.data_volume, 'secret', 'tls', filename)

        return object.__getattribute__(self, name)

    def _check(self, filename: str):
        """
        Check cert and key files are correct
        """

        path = Path(os.path.join(internal_tls_dir, filename))

        if not path.exists:
            if filename == 'harbor_internal_ca.crt':
                return
            raise Exception('File {} not exist'.format(filename))

        if not path.is_file:
            raise Exception('invalid {}'.format(filename))

        # check key file permission
        if filename.endswith('.key') and not check_permission(path, mode=0o600):
            raise Exception('key file {} permission is not 600'.format(filename))

        # check certificate file
        if filename.endswith('.crt'):
            if not owner_can_read(path.stat().st_mode):
                # check owner can read cert file
                raise Exception('File {} should readable by owner'.format(filename))
            if not san_existed(path):
                # check SAN included
                if filename == 'harbor_internal_ca.crt':
                    return
                raise Exception('cert file {} should include SAN'.format(filename))


    def validate(self) -> bool:
        if not self.enabled:
            # pass the validation if not enabled
            return True

        if not internal_tls_dir.exists():
            raise Exception('Internal dir for tls {} not exist'.format(internal_tls_dir))

        for filename in self.required_filenames:
            self._check(filename)

        return True

    def prepare(self):
        """
        Prepare moves certs in tls file to data volume with correct permission.
        """
        if not self.enabled:
            logging.info('internal tls NOT enabled...')
            return
        original_tls_dir = get_realpath(self.tls_dir)
        if internal_tls_dir.exists():
            rmtree(internal_tls_dir)
        copytree(original_tls_dir, internal_tls_dir, symlinks=True)

        for file in internal_tls_dir.iterdir():
            if file.name.endswith('.key'):
                file.chmod(0o600)
            elif file.name.endswith('.crt'):
                file.chmod(0o644)

            if file.name in self.db_certs_filename:
                os.chown(file, PG_UID, PG_GID)
            else:
                os.chown(file, DEFAULT_UID, DEFAULT_GID)


class Metric:
    def __init__(self, enabled: bool = False, port: int = 8080, path: str = "metrics" ):
        self.enabled = enabled
        self.port = port
        self.path = path

    def validate(self):
        if not port_number_valid(self.port):
            raise Exception('Port number in metrics is not valid')