# Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
#
# 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.

""" Test Env, manages DUT, App and EnvConfig, interface for test cases to access these components """
import os
import threading
import functools

import EnvConfig


def _synced(func):
    @functools.wraps(func)
    def decorator(self, *args, **kwargs):
        with self.lock:
            ret = func(self, *args, **kwargs)
        return ret

    decorator.__doc__ = func.__doc__
    return decorator


class Env(object):
    """
    test env, manages DUTs and env configs.

    :keyword app: class for default application
    :keyword dut: class for default DUT
    :keyword env_tag: test env tag, used to select configs from env config file
    :keyword env_config_file: test env config file path
    :keyword test_name: test suite name, used when generate log folder name
    """

    def __init__(self,
                 app=None,
                 dut=None,
                 env_tag=None,
                 env_config_file=None,
                 test_name=None,
                 **kwargs):
        self.app_cls = app
        self.default_dut_cls = dut
        self.config = EnvConfig.Config(env_config_file, env_tag)
        self.log_path = self.app_cls.get_log_folder(test_name)
        if not os.path.exists(self.log_path):
            os.makedirs(self.log_path)

        self.allocated_duts = dict()
        self.lock = threading.RLock()

    @_synced
    def get_dut(self, dut_name, app_path, dut_class=None, app_class=None):
        """
        get_dut(dut_name, app_path, dut_class=None, app_class=None)

        :param dut_name: user defined name for DUT
        :param app_path: application path, app instance will use this path to process application info
        :param dut_class: dut class, if not specified will use default dut class of env
        :param app_class: app class, if not specified will use default app of env
        :return: dut instance
        """
        if dut_name in self.allocated_duts:
            dut = self.allocated_duts[dut_name]["dut"]
        else:
            if dut_class is None:
                dut_class = self.default_dut_cls
            if app_class is None:
                app_class = self.app_cls
            app_inst = app_class(app_path)
            try:
                port = self.config.get_variable(dut_name)
            except ValueError:
                # try to auto detect ports
                allocated_ports = [self.allocated_duts[x]["port"] for x in self.allocated_duts]
                available_ports = dut_class.list_available_ports()
                for port in available_ports:
                    if port not in allocated_ports:
                        if dut_class.confirm_dut(port, app_inst):
                            break
                else:
                    port = None
            if port:
                try:
                    dut_config = self.get_variable(dut_name + "_port_config")
                except ValueError:
                    dut_config = dict()
                dut = self.default_dut_cls(dut_name, port,
                                           os.path.join(self.log_path, dut_name + ".log"),
                                           app_inst,
                                           **dut_config)
                self.allocated_duts[dut_name] = {"port": port, "dut": dut}
            else:
                raise ValueError("Failed to get DUT")
        return dut

    @_synced
    def close_dut(self, dut_name):
        """
        close_dut(dut_name)
        close one DUT by name if DUT name is valid (the name used by ``get_dut``). otherwise will do nothing.

        :param dut_name: user defined name for DUT
        :return: None
        """
        try:
            dut = self.allocated_duts.pop(dut_name)["dut"]
            dut.close()
        except KeyError:
            pass

    @_synced
    def get_variable(self, variable_name):
        """
        get_variable(variable_name)
        get variable from config file. If failed then try to auto-detected it.

        :param variable_name: name of the variable
        :return: value of variable if successfully found. otherwise None.
        """
        return self.config.get_variable(variable_name)

    @_synced
    def get_pc_nic_info(self, nic_name="pc_nic"):
        """
        get_pc_nic_info(nic_name="pc_nic")
        try to get nic info (ip address, ipv6 address, mac address)

        :param nic_name: pc nic name. allows passing variable name, nic name value or omitted (to get default nic info).
        :return: a dict of address ("ipv4", "ipv6", "mac") if successfully found. otherwise None.
        """
        # TODO: need to implement auto get nic info method
        return self.config.get_variable("nic_info/" + nic_name)

    @_synced
    def close(self):
        """
        close()
        close all DUTs of the Env.

        :return: None
        """
        for dut_name in self.allocated_duts:
            dut = self.allocated_duts[dut_name]["dut"]
            dut.close()
        self.allocated_duts = dict()