# Lint as: python3
#!/usr/bin/env python3
#
# Copyright 2022 The Fuchsia 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.
#
#   This class provides pipeline betweem python tests and WLAN policy facade.

from enum import StrEnum

from honeydew import errors
from honeydew.interfaces.device_classes.fuchsia_device import (
    FuchsiaDevice as HdFuchsiaDevice,
)
from honeydew.typing.wlan import (
    ClientStateSummary,
    ConnectionState,
    DisconnectStatus,
    NetworkConfig,
    NetworkIdentifier,
    NetworkState,
    RequestStatus,
    SecurityType,
    WlanClientState,
)

from antlion.controllers.ap_lib.hostapd_security import FuchsiaSecurityType
from antlion.controllers.fuchsia_lib.base_lib import BaseLib
from antlion.validation import MapValidator

DEFAULT_UPDATE_TIMEOUT_SEC: float = 30.0


class WlanPolicyError(Exception):
    """Exception for SL4F commands executed by WLAN Policy."""


class Command(StrEnum):
    """Sl4f Server Commands."""

    CONNECT = "wlan_policy.connect"
    CREATE_CLIENT_CONTROLLER = "wlan_policy.create_client_controller"
    GET_SAVED_NETWORKS = "wlan_policy.get_saved_networks"
    GET_UPDATE = "wlan_policy.get_update"
    REMOVE_ALL_NETWORKS = "wlan_policy.remove_all_networks"
    REMOVE_NETWORK = "wlan_policy.remove_network"
    SAVE_NETWORK = "wlan_policy.save_network"
    SCAN_FOR_NETWORKS = "wlan_policy.scan_for_networks"
    SET_NEW_UPDATE_LISTENER = "wlan_policy.set_new_update_listener"
    START_CLIENT_CONNECTIONS = "wlan_policy.start_client_connections"
    STOP_CLIENT_CONNECTIONS = "wlan_policy.stop_client_connections"


class FuchsiaWlanPolicyLib(BaseLib):
    def __init__(self, addr: str, honeydew_fd: HdFuchsiaDevice | None = None) -> None:
        super().__init__(addr, "wlan_policy")
        self.honeydew_fd = honeydew_fd

    def _check_response_error(
        self, cmd: Command, response_json: dict[str, object]
    ) -> object | None:
        """Helper method to process errors from SL4F calls.

        Args:
            cmd: SL4F command sent.
            response_json: Response from SL4F server.

        Returns:
            Response json or None if error.

        Raises:
            WlanPolicyError if the response_json has something in the 'error' field.
        """
        resp = MapValidator(response_json)
        error = resp.get(str, "error", None)
        if error:
            # We sometimes expect to catch WlanPolicyError so we include a log here for
            # when we do retries.
            self.log.debug(f"SL4F call: {cmd} failed with Error: '{error}'.")
            raise WlanPolicyError(f"SL4F call: {cmd} failed with Error: '{error}'.")
        else:
            return response_json.get("result")

    def connect(
        self, target_ssid: str, security_type: SecurityType | FuchsiaSecurityType
    ) -> RequestStatus:
        """Triggers connection to a network.

        Args:
            target_ssid: The network to connect to. Must have been previously
                saved in order for a successful connection to happen.
            security_type: The security protocol of the network.

        Returns:
            A RequestStatus response to the connect request.

        Raises:
            WlanPolicyError: Sl4f run command failed.
            TypeError: Return value not a string.
        """
        # TODO(b/308807691): Change other uses of FuchsiaSecurityType to Honeydew's
        # SecurityType
        hd_security_type = SecurityType(security_type.value)
        method_params = {
            "target_ssid": target_ssid,
            "security_type": str(hd_security_type),
        }
        if self.honeydew_fd:
            try:
                return self.honeydew_fd.wlan_policy.connect(
                    target_ssid, hd_security_type
                )
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.CONNECT, method_params)
            result = self._check_response_error(Command.CONNECT, resp)

            if not isinstance(result, str):
                raise TypeError(f'Expected "result" to be str, got {type(result)}')

            return RequestStatus(result)

    def create_client_controller(self) -> None:
        """Initializes the client controller.

        Raises:
            WlanPolicyError: Sl4f run command failed.
        """
        if self.honeydew_fd:
            try:
                self.honeydew_fd.wlan_policy.create_client_controller()
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.CREATE_CLIENT_CONTROLLER)
            self._check_response_error(Command.CREATE_CLIENT_CONTROLLER, resp)

    def get_saved_networks(self) -> list[NetworkConfig]:
        """Gets networks saved on device.

        Returns:
            A list of NetworkConfigs.

        Raises:
            WlanPolicyError: Sl4f run command failed.
            TypeError: Return values not correct types.
        """
        if self.honeydew_fd:
            try:
                return self.honeydew_fd.wlan_policy.get_saved_networks()
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.GET_SAVED_NETWORKS)
            result = self._check_response_error(Command.GET_SAVED_NETWORKS, resp)

            if not isinstance(result, list):
                raise TypeError(f'Expected "result" to be list, got {type(result)}')

            networks: list[NetworkConfig] = []
            for n in result:
                if not isinstance(n, dict):
                    raise TypeError(f'Expected "network" to be dict, got {type(n)}')

                network = MapValidator(n)
                security_type = network.get(str, "security_type", "None")
                networks.append(
                    NetworkConfig(
                        ssid=network.get(str, "ssid"),
                        security_type=SecurityType(security_type.lower()),
                        credential_type=network.get(str, "credential_type"),
                        credential_value=network.get(str, "credential_value"),
                    )
                )
            return networks

    def get_update(
        self, timeout: float = DEFAULT_UPDATE_TIMEOUT_SEC
    ) -> ClientStateSummary:
        """Gets one client listener update.

        This call will return with an update immediately the
        first time the update listener is initialized by setting a new listener
        or by creating a client controller before setting a new listener.
        Subsequent calls will hang until there is a change since the last
        update call.

        Args:
            timeout: Timeout in seconds to wait for the get_update command to
                return.

        Returns:
            An update of connection status. If there is no error, the result is
            a WlanPolicyUpdate with a structure that matches the FIDL
            ClientStateSummary struct given for updates.

        Raises:
            WlanPolicyError: Sl4f run command failed.
            TypeError: Return values not correct types.
        """
        if self.honeydew_fd:
            try:
                return self.honeydew_fd.wlan_policy.get_update(response_timeout=timeout)
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.GET_UPDATE, response_timeout=timeout)
            result_raw = self._check_response_error(Command.GET_UPDATE, resp)

            if not isinstance(result_raw, dict):
                raise TypeError(f'Expected "result" to be dict, got {type(result_raw)}')

            result = MapValidator(result_raw)
            networks = result.get(list, "networks", [])

            network_states: list[NetworkState] = []
            for n in networks:
                network = MapValidator(n)
                state = network.get(str, "state")
                status = network.get(str, "status", None)
                if status is None:
                    status = DisconnectStatus.CONNECTION_STOPPED

                id = MapValidator(network.get(dict, "id"))
                ssid = id.get(str, "ssid")
                security_type = id.get(str, "type_")

                network_states.append(
                    NetworkState(
                        network_identifier=NetworkIdentifier(
                            ssid=ssid,
                            security_type=SecurityType(security_type.lower()),
                        ),
                        connection_state=ConnectionState(state),
                        disconnect_status=DisconnectStatus(status),
                    )
                )
            client_state = result.get(str, "state")
            return ClientStateSummary(
                state=WlanClientState(client_state), networks=network_states
            )

    def remove_all_networks(self) -> None:
        """Deletes all saved networks on the device.

        Raises:
            WlanPolicyError: Sl4f run command failed.
        """
        if self.honeydew_fd:
            try:
                self.honeydew_fd.wlan_policy.remove_all_networks()
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.REMOVE_ALL_NETWORKS)
            self._check_response_error(Command.REMOVE_ALL_NETWORKS, resp)

    def remove_network(
        self,
        target_ssid: str,
        security_type: SecurityType,
        target_pwd: str | None = None,
    ) -> None:
        """Removes or "forgets" a network from saved networks.

        Args:
            target_ssid: The network to remove.
            security_type: The security protocol of the network.
            target_pwd: The credential being saved with the network. No password
                is equivalent to an empty string.

        Raises:
            WlanPolicyError: Sl4f run command failed.
        """
        if not target_pwd:
            target_pwd = ""

        method_params = {
            "target_ssid": target_ssid,
            "security_type": str(security_type),
            "target_pwd": target_pwd,
        }
        if self.honeydew_fd:
            try:
                self.honeydew_fd.wlan_policy.remove_network(
                    target_ssid, security_type, target_pwd
                )
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.REMOVE_NETWORK, method_params)
            self._check_response_error(Command.REMOVE_NETWORK, resp)

    def save_network(
        self,
        target_ssid: str,
        security_type: SecurityType | FuchsiaSecurityType,
        target_pwd: str | None = None,
    ) -> None:
        """Saves a network to the device.

        Args:
            target_ssid: The network to save.
            security_type: The security protocol of the network.
            target_pwd: The credential being saved with the network. No password
                is equivalent to an empty string.

        Raises:
            WlanPolicyError: Sl4f run command failed.
        """
        # TODO(b/308807691): Change other uses of FuchsiaSecurityType to Honeydew's
        # SecurityType
        hd_security_type = SecurityType(security_type.value)
        if not target_pwd:
            target_pwd = ""

        method_params = {
            "target_ssid": target_ssid,
            "security_type": str(hd_security_type.value),
            "target_pwd": target_pwd,
        }
        if self.honeydew_fd:
            try:
                self.honeydew_fd.wlan_policy.save_network(
                    target_ssid, hd_security_type, target_pwd
                )
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.SAVE_NETWORK, method_params)
            self._check_response_error(Command.SAVE_NETWORK, resp)

    def scan_for_networks(self) -> list[str]:
        """Scans for networks.

        Returns:
            A list of network SSIDs that can be connected to.

        Raises:
            WlanPolicyError: Sl4f run command failed.
            TypeError: Return value not a list.
        """
        if self.honeydew_fd:
            try:
                return self.honeydew_fd.wlan_policy.scan_for_network()
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.SCAN_FOR_NETWORKS)
            result = self._check_response_error(Command.SCAN_FOR_NETWORKS, resp)

            if not isinstance(result, list):
                raise TypeError(f'Expected "result" to be list, got {type(result)}')

            return result

    def set_new_update_listener(self) -> None:
        """Sets the update listener stream of the facade to a new stream.
        This causes updates to be reset. Intended to be used between tests so
        that the behaviour of updates in a test is independent from previous
        tests.

        Raises:
            WlanPolicyError: Sl4f run command failed.
        """
        if self.honeydew_fd:
            try:
                self.honeydew_fd.wlan_policy.set_new_update_listener()
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.SET_NEW_UPDATE_LISTENER)
            self._check_response_error(Command.SET_NEW_UPDATE_LISTENER, resp)

    def start_client_connections(self) -> None:
        """Enables device to initiate connections to networks.

        Raises:
            WlanPolicyError: Sl4f run command failed.
        """
        if self.honeydew_fd:
            try:
                self.honeydew_fd.wlan_policy.start_client_connections()
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.START_CLIENT_CONNECTIONS)
            self._check_response_error(Command.START_CLIENT_CONNECTIONS, resp)

    def stop_client_connections(self) -> None:
        """Disables device for initiating connections to networks.

        Raises:
            WlanPolicyError: Sl4f run command failed.
        """
        if self.honeydew_fd:
            try:
                self.honeydew_fd.wlan_policy.stop_client_connections()
            except errors.Sl4fError as e:
                raise WlanPolicyError from e
        else:
            resp = self.send_command(Command.STOP_CLIENT_CONNECTIONS)
            self._check_response_error(Command.STOP_CLIENT_CONNECTIONS, resp)