# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
#
# 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.

from __future__ import absolute_import
import logging
from .... import FastDeployModel, ModelFormat
from .... import c_lib_wrap as C


class FastestDetPreprocessor:
    def __init__(self):
        """Create a preprocessor for FastestDet
        """
        self._preprocessor = C.vision.detection.FastestDetPreprocessor()

    def run(self, input_ims):
        """Preprocess input images for FastestDet

        :param: input_ims: (list of numpy.ndarray)The input image
        :return: list of FDTensor
        """
        return self._preprocessor.run(input_ims)

    @property
    def size(self):
        """
        Argument for image preprocessing step, the preprocess image size, tuple of (width, height), default size = [352, 352]
        """
        return self._preprocessor.size

    @size.setter
    def size(self, wh):
        assert isinstance(wh, (list, tuple)),\
            "The value to set `size` must be type of tuple or list."
        assert len(wh) == 2,\
            "The value to set `size` must contatins 2 elements means [width, height], but now it contains {} elements.".format(
            len(wh))
        self._preprocessor.size = wh


class FastestDetPostprocessor:
    def __init__(self):
        """Create a postprocessor for FastestDet
        """
        self._postprocessor = C.vision.detection.FastestDetPostprocessor()

    def run(self, runtime_results, ims_info):
        """Postprocess the runtime results for FastestDet

        :param: runtime_results: (list of FDTensor)The output FDTensor results from runtime
        :param: ims_info: (list of dict)Record input_shape and output_shape
        :return: list of DetectionResult(If the runtime_results is predict by batched samples, the length of this list equals to the batch size)
        """
        return self._postprocessor.run(runtime_results, ims_info)

    @property
    def conf_threshold(self):
        """
        confidence threshold for postprocessing, default is 0.65
        """
        return self._postprocessor.conf_threshold

    @property
    def nms_threshold(self):
        """
        nms threshold for postprocessing, default is 0.45
        """
        return self._postprocessor.nms_threshold

    @conf_threshold.setter
    def conf_threshold(self, conf_threshold):
        assert isinstance(conf_threshold, float),\
            "The value to set `conf_threshold` must be type of float."
        self._postprocessor.conf_threshold = conf_threshold

    @nms_threshold.setter
    def nms_threshold(self, nms_threshold):
        assert isinstance(nms_threshold, float),\
            "The value to set `nms_threshold` must be type of float."
        self._postprocessor.nms_threshold = nms_threshold


class FastestDet(FastDeployModel):
    def __init__(self,
                 model_file,
                 params_file="",
                 runtime_option=None,
                 model_format=ModelFormat.ONNX):
        """Load a FastestDet model exported by FastestDet.

        :param model_file: (str)Path of model file, e.g ./FastestDet.onnx
        :param params_file: (str)Path of parameters file, e.g yolox/model.pdiparams, if the model_fomat is ModelFormat.ONNX, this param will be ignored, can be set as empty string
        :param runtime_option: (fastdeploy.RuntimeOption)RuntimeOption for inference this model, if it's None, will use the default backend on CPU
        :param model_format: (fastdeploy.ModelForamt)Model format of the loaded model
        """

        super(FastestDet, self).__init__(runtime_option)

        assert model_format == ModelFormat.ONNX, "FastestDet only support model format of ModelFormat.ONNX now."
        self._model = C.vision.detection.FastestDet(
            model_file, params_file, self._runtime_option, model_format)

        assert self.initialized, "FastestDet initialize failed."

    def predict(self, input_image):
        """Detect an input image

        :param input_image: (numpy.ndarray)The input image data, 3-D array with layout HWC, BGR format
        :return: DetectionResult
        """
        assert input_image is not None, "Input image is None."
        return self._model.predict(input_image)

    def batch_predict(self, images):
        assert len(images) == 1,"FastestDet is only support 1 image in batch_predict"
        """Classify a batch of input image

        :param im: (list of numpy.ndarray) The input image list, each element is a 3-D array with layout HWC, BGR format
        :return list of DetectionResult
        """

        return self._model.batch_predict(images)

    @property
    def preprocessor(self):
        """Get FastestDetPreprocessor object of the loaded model

        :return FastestDetPreprocessor
        """
        return self._model.preprocessor

    @property
    def postprocessor(self):
        """Get FastestDetPostprocessor object of the loaded model

        :return FastestDetPostprocessor
        """
        return self._model.postprocessor