# MIT License
#
# Copyright (c) 2021 Templin Konstantin
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import warnings
from typing import List, Optional, Generator

from feijoa.models.configuration import Configuration
from feijoa.models.experiment import Experiment
from feijoa.search.algorithms import SearchAlgorithm
from feijoa.search.visitors import Randomizer

__all__ = ["RandomSearch"]


class RandomSearch(SearchAlgorithm):
    def __init__(self, search_space, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.search_space = search_space
        self.randomizer = Randomizer()
        self._ask_gen = None

    def ask(self, n: int = 1) -> Optional[List[Configuration]]:
        if not self._ask_gen:
            self._ask_gen = self._ask(n)
        return next(self._ask_gen)

    def _ask(self, n: int) -> Generator:

        while True:
            cfgs = []

            for _ in range(n):
                cfg = dict()

                for p in self.search_space:
                    cfg[p.name] = p.accept(self.randomizer)

                cfgs.append(Configuration(cfg, requestor=self.name))

            yield cfgs

    def tell(self, config, result):
        # no needed
        pass
