# Copyright (C) 2010-2018 Linaro Limited
#
# Author: Zygmunt Krynicki <zygmunt.krynicki@linaro.org>
#         Michael Hudson-Doyle <michael.hudson@linaro.org>
#
# SPDX-License-Identifier: GPL-2.0-or-later

import logging
import xmlrpc.client
from functools import wraps

from django.conf import settings
from django.contrib.auth.models import Group, User
from django.core.exceptions import PermissionDenied
from django.http import Http404

from lava_common.version import __version__
from lava_common.yaml import yaml_safe_dump
from lava_scheduler_app.api import check_perm
from lava_scheduler_app.models import (
    Device,
    DeviceType,
    GroupDevicePermission,
    GroupDeviceTypePermission,
    TestJob,
)
from linaro_django_xmlrpc.models import Mapper, SystemAPI, errors


def check_staff(f):
    """decorator to check that the caller has staff permissions"""

    @wraps(f)
    def wrapper(self, *args, **kwargs):
        self._authenticate()
        if not self.user.is_staff:
            raise xmlrpc.client.Fault(errors.FORBIDDEN, "forbidden")
        elif not self.user.is_active:
            raise xmlrpc.client.Fault(errors.AUTH_BLOCKED, "user is blocked")
        return f(self, *args, **kwargs)

    return wrapper


class LavaSystemAPI(SystemAPI):
    """
    Extend the default SystemAPI with a 'whoami' method.
    """

    def __init__(self, context):
        logging.basicConfig()
        self.logger = logging.getLogger("lava-server-api")
        super().__init__(context)

    def whoami(self):
        """
        Name
        ----
        `whoami` ()

        Description
        -----------
        Find the authenticated user, if any, or None.

        Arguments
        ---------
        None

        Return value
        ------------
        Name of the authenticated user, if any, or None.
        """
        if self.user:
            return self.user.username
        else:
            return None

    def version(self):
        """
        Name
        ----
        `system.version` ()

        Description
        -----------
        Return the lava-server version string

        Arguments
        ---------
        None

        Return value
        ------------
        lava-server version string
        """
        return __version__

    # Update the integer return value when adding arguments to
    # existing functions anywhere in the XML-RPC API or
    # deleting functions.
    def api_version(self):
        """
        Name
        ----
        `system.api_version` ()

        Description
        -----------
        Return the lava-server XML-RPC API version string.
        Clients can check this string to know whether to
        use particular arguments to available functions.

        Note: For older instances which do not support this
        call in the first place, check for this call in the
        output of system.listMethods()

        if 'system.api_version' in connection.system.listMethods():
            api_version = int(connection.system.api_version())
                if api_version >= 2:
                    # safe to run the new API here.
        else:
            # use the old API

        Arguments
        ---------
        None

        Return value
        ------------
        lava-server XML-RPC API version integer
        """
        return 2

    def master_config(self):
        """
        Name
        ----
        `master_config` ()

        Description
        -----------
        Return a dictionary containing the master and logger ZMQ
        socket addresses for this instance.

        Arguments
        ---------
        None

        Return value
        ------------
        Returns a dictionary containing the following keys:
        {
          "EVENT_SOCKET": "tcp://*:5500",
          "EVENT_TOPIC": "org.linaro.validation",
          "EVENT_NOTIFICATION": True,
          "LOG_SIZE_LIMIT": 10,
        }
        """
        return {
            "EVENT_TOPIC": settings.EVENT_TOPIC,
            "EVENT_SOCKET": settings.EVENT_SOCKET,
            "EVENT_NOTIFICATION": settings.EVENT_NOTIFICATION,
            "LOG_SIZE_LIMIT": settings.LOG_SIZE_LIMIT,
        }

    def user_can_view_jobs(self, job_list, username=None):
        """
        Name
        ----
        user_can_view_jobs (`job_list`)

        Administrators only:
        user_can_view_jobs (`job_list`, `username`)

        Description
        -----------
        Check the access permissions on a list of jobs.
        Admins can specify a username as the second argument to run
        the query on behalf of that user.

        Arguments
        ---------
        job_list: list
            list of job ids to query
        username: string
            username of the user to query (admins only)

        Return value
        ------------
        Returns a dictionary where the key is a string of the job_id from
        the job_list, if it exists in the queried instance. The value is a boolean
        for whether the user can access that job.
        {
          '1234': True,
          '1543': False
        }
        If the job number does not exist, that job will be omitted from the
        returned dictionary.
        This function requires authentication with a username and token.

        Example
        -------
        server.system.user_can_view_jobs([1, 2, 3, 4, 99999, 4000])
        {'1': True, '4000': True, '3': True, '2': True, '4': True}

        # if using the username and token of an admin, a different user can be queried:
        server.system.user_can_view_jobs([1, 2, 3, 4, 99999, 4000], 'firstname.lastname')
        {'1': True, '4000': False, '3': True, '2': True, '4': False}

        """
        self._authenticate()
        if not isinstance(job_list, list):
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "job list argument must be a list"
            )
        user = self._switch_user(username)
        retval = {}
        for job_id in job_list:
            try:
                TestJob.get_restricted_job(job_id, user)
            except Http404:
                continue
            except PermissionDenied:
                retval[str(job_id)] = False
                continue
            retval[str(job_id)] = True
        return retval

    def user_can_view_bundles(self, bundle_list, username=None):
        """
        Name
        ----
        user_can_view_bundles (`bundle_list`)

        Removal of V1 support
        --------------------
        This function has been disabled. It is retained as a stub for older
        versions of clients. Please update your tool to use LAVA V2.

        """
        return False

    def user_can_view_devices(self, device_list, username=None):
        """
        Name
        ----
        user_can_view_devices (`device_list`)

        Administrators only:
        user_can_view_devices (`device_list`, `username`)

        Description
        -----------
        Check the access permissions on a list of devices.
        Admins can specify a username as the second argument to run
        the query on behalf of that user.

        Arguments
        ---------
        device_list: list
            list of device hostnames to query
        username: string
            username of the user to query (admins only)

        Return value
        ------------
        Returns a nested dictionary where the top level key is the device type, the value is
        a list of dictionaries. The key of the second dictionary is a hostname from the device_list
        which exists in the queried instance. The value is a boolean
        for whether the user can access that device.
        If the device is visible, also includes a boolean denoting whether the specified
        device is a pipeline device which can run jobs designed in the dispatcher refactoring.
        If a pipeline device, also includes a boolean denoting whether the specified pipeline
        device exclusively accepts YAML submissions - JSON submissions are rejected if this
        device is marked as exclusive.
        {
            'mustang': [
                {
                    'mustang01': {
                        'visible': True
                        }
                }
            ],
            'panda': [
                {
                    'panda05': {
                        'visible': True
                        }
                    }
            ]
        }

        If the device type is hidden, that type and the nested dictionary for that type
        will be omitted.
        Retired devices will be omitted.
        If the device does not exist, that device will be omitted from the
        returned dictionary.
        This function requires authentication with a username and token.

        Example
        -------

        server.system.user_can_view_devices(['kvm014', 'kvm02'])
        {'qemu':
            [
                {'kvm014': {
                    'exclusive': True,
                    'visible': True,
                    'is_pipeline': True
                    }
                },
                {'kvm02': {
                    'exclusive': True,
                    'visible': True,
                    'is_pipeline': True}
                }
            ]
        }

        # if using the username and token of an admin, a different user can be queried:
        server.system.user_can_view_devices(
            ['mustang01', 'wandboard07', 'imx53-01', 'cubietruck02', 'black01'],
            'firstname.lastname'
        )

        """
        self._authenticate()
        if not isinstance(device_list, list):
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "device list argument must be a list"
            )
        username = self._switch_user(username)
        retval = {}
        for hostname in device_list:
            try:
                device = Device.objects.get(hostname=hostname)
            except Device.DoesNotExist:
                continue
            device_type = device.device_type
            retval.setdefault(device_type.name, [])
            visible = device.can_view(username)
            if visible:
                retval[device_type.name].append(
                    {
                        hostname: {
                            "is_pipeline": True,
                            "visible": visible,
                            "exclusive": True,
                        }
                    }
                )
            else:
                retval[device_type.name].append({hostname: {"visible": visible}})
        return retval

    def user_can_submit_to_types(self, type_list, username=None):
        """
        Name
        ----
        user_can_submit_to_types (`type_list`)

        Administrators only:
        user_can_submit_to_types (`type_list`, `username`)

        Description
        -----------
        Check the access permissions on a list of device types.
        Admins can specify a username as the second argument to run
        the query on behalf of that user.

        Arguments
        ---------
        type_list: list
            list of device types to query
        username: string
            username of the user to query (admins only)

        Return value
        ------------
        Returns a dictionary where the key is a string of the device_type from
        the type_list, if it exists in the queried instance. The value is a boolean
        for whether the user can submit to any devices of the specified type.
        {
          'panda': True,
          'mustang': False
        }
        If the device type number does not exist, that type will be omitted from the
        returned dictionary.
        This function requires authentication with a username and token.

        Example
        -------
        server.system.user_can_submit_to_types(
            ['mustang', 'panda', 'qemu', 'kvm', 'cubie2']
        )
        {'cubie2': True, 'mustang': False, 'kvm': True, 'qemu': True, 'panda': True}

        # if using the username and token of an admin, a different user can be queried:
        server.system.user_can_submit_to_types(
            ['mustang', 'panda', 'qemu', 'kvm', 'cubie2'],
            'firstname.lastname'
        )

        """
        self._authenticate()
        if not isinstance(type_list, list):
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "type list argument must be a list"
            )
        user = self._switch_user(username)

        retval = {}
        device_types = DeviceType.objects.filter(name__in=type_list)

        for device_type in device_types:
            accessible = False
            if user.has_perm(DeviceType.SUBMIT_PERMISSION, device_type):
                accessible = True
            retval[device_type.name] = accessible
        return retval

    @check_staff
    def set_user_groups(self, user, groups):
        """
        Name
        ----
        set_user_groups(`user`, `groups`):

        Description
        -----------

        Set the groups a given user belongs to.

        This function requires staff access.

        Arguments
        ---------
        user: str
            user (identified by email) whose groups will be changed
        groups: Array of str
            the name of each group to which this user belongs

        Return value
        ------------
        No return value.
        """
        try:
            user = User.objects.get(email=user)
        except User.DoesNotExist:
            raise xmlrpc.client.Fault(errors.BAD_REQUEST, "please use an existing user")

        if not isinstance(groups, list):
            raise xmlrpc.client.Fault(errors.BAD_REQUEST, "groups must be a list")

        transformed_groups = Group.objects.filter(name__in=groups)
        missing = set(groups) - {t.name for t in transformed_groups}
        if missing:
            missing = ", ".join(missing)
            self.logger.debug(
                f"set_user_groups: skipped groups {missing} which do not exist"
            )

        user.groups.set(transformed_groups)

    @check_perm("lava_scheduler_app.change_devicetype")
    def assign_perm_device_type(self, perm, device_type, group):
        """
        Name
        ----
        assign_perm_device_type(`perm`, `device_type`, `group`):

        Description
        -----------

        Grant a permission to a specific group over a device type.

        This function requires ``change_devicetype`` permission.

        Arguments
        ---------
        perm: string
            Permission codename string. Currently supported permissions for
            Device_Types are 'view_devicetype', 'submit_to_devicetype' and
            'change_devicetype'.
        device_type: string
            name of device type to assign permission for. Device type with
            specified name must exist in LAVA.
        group: string
            group name to which the permission will be granted

        Return value
        ------------
        No return value.
        """
        if not isinstance(device_type, str):
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "device_type name must be a string"
            )
        try:
            group = Group.objects.get(name=group)
        except Group.DoesNotExist:
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "please use existing group name"
            )

        try:
            device_type = DeviceType.objects.get(name=device_type)
        except DeviceType.DoesNotExist:
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "please use existing device type name"
            )

        GroupDeviceTypePermission.objects.assign_perm(perm, group, device_type)

    @check_perm("lava_scheduler_app.change_devicetype")
    def revoke_perm_device_type(self, perm, device_type, group):
        """
        Name
        ----
        revoke_perm_device_type(`perm`, `device_type`, `group`):

        Description
        -----------

        Revoke a permission from a specific group over a device type.

        This function requires ``change_devicetype`` permission.

        Arguments
        ---------
        perm: string
            Permission codename string. Currently supported permissions for
            Device_Types are 'view_devicetype', 'submit_to_devicetype' and
            'change_devicetype'.
        device_type: string
            name of device type to revoke permission for. Device type with
            specified name must exist in LAVA.
        group: string
            group name to which the permission will be revoked

        Return value
        ------------
        No return value.
        """
        if not isinstance(device_type, str):
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "device_type name must be a string"
            )
        try:
            group = Group.objects.get(name=group)
        except Group.DoesNotExist:
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "please use existing group name"
            )

        try:
            device_type = DeviceType.objects.get(name=device_type)
        except DeviceType.DoesNotExist:
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "please use existing device type name"
            )

        GroupDeviceTypePermission.objects.remove_perm(perm, group, device_type)

    @check_perm("lava_scheduler_app.change_device")
    def assign_perm_device(self, perm, device, group):
        """
        Name
        ----
        assign_perm_device(`perm`, `device`, `group`):

        Description
        -----------

        Grant a permission to a specific group over a device.

        This function requires ``change_device`` permission.

        Arguments
        ---------
        perm: string
            Permission codename string. Currently supported permissions for
            Devices are 'view_device', 'submit_to_device' and
            'change_device'.
        device: string
            device hostname to assign permission for. Device with the specific
            hostname must exist in LAVA.
        group: string
            group name to which the permission will be granted

        Return value
        ------------
        No return value.
        """
        if not isinstance(device, str):
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "device argument must be a string"
            )
        try:
            group = Group.objects.get(name=group)
        except Group.DoesNotExist:
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "please use existing group name"
            )

        try:
            device = Device.objects.get(hostname=device)
        except Device.DoesNotExist:
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "please use existing device hostname"
            )

        GroupDevicePermission.objects.assign_perm(perm, group, device)

    @check_perm("lava_scheduler_app.change_device")
    def revoke_perm_device(self, perm, device, group):
        """
        Name
        ----
        revoke_perm_device(`perm`, `device`, `group`):

        Description
        -----------

        Revoke a permission from a specific group over a device.

        This function requires ``change_device`` permission.

        Arguments
        ---------
        perm: string
            Permission codename string. Currently supported permissions for
            Devices are 'view_device', 'submit_to_device' and 'change_device'.
        device: string
            device hostname to revoke permission for. Device with the specific
            hostname must exist in LAVA.
        group: string
            group name to which the permission will be revoked

        Return value
        ------------
        No return value.
        """
        if not isinstance(device, str):
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "device argument must be a string"
            )
        try:
            group = Group.objects.get(name=group)
        except Group.DoesNotExist:
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "please use existing group name"
            )

        try:
            device = Device.objects.get(hostname=device)
        except Device.DoesNotExist:
            raise xmlrpc.client.Fault(
                errors.BAD_REQUEST, "please use existing device hostname"
            )

        GroupDevicePermission.objects.remove_perm(perm, group, device)


class LavaMapper(Mapper):
    def register_introspection_methods(self):
        """
        Register LavaSystemAPI as 'system' object.

        LavaSystemAPI adds a 'whoami' system method above what the default
        has.
        """
        self.register(LavaSystemAPI, "system")
