# coding=utf-8
# Copyright 2022 The HuggingFace Inc. team. 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.
""" Testing suite for the TensorFlow ViTMAE model. """


import copy
import inspect
import json
import math
import os
import tempfile
import unittest
from importlib import import_module

import numpy as np

from transformers import ViTMAEConfig
from transformers.file_utils import cached_property, is_tf_available, is_vision_available
from transformers.testing_utils import require_tf, require_vision, slow

from ...test_configuration_common import ConfigTester
from ...test_modeling_tf_common import TFModelTesterMixin, floats_tensor, ids_tensor


if is_tf_available():
    import tensorflow as tf

    from transformers import TFViTMAEForPreTraining, TFViTMAEModel


if is_vision_available():
    from PIL import Image

    from transformers import ViTFeatureExtractor


class TFViTMAEModelTester:
    def __init__(
        self,
        parent,
        batch_size=13,
        image_size=30,
        patch_size=2,
        num_channels=3,
        is_training=True,
        use_labels=True,
        hidden_size=32,
        num_hidden_layers=5,
        num_attention_heads=4,
        intermediate_size=37,
        hidden_act="gelu",
        hidden_dropout_prob=0.1,
        attention_probs_dropout_prob=0.1,
        type_sequence_label_size=10,
        initializer_range=0.02,
        num_labels=3,
        mask_ratio=0.6,
        scope=None,
    ):
        self.parent = parent
        self.batch_size = batch_size
        self.image_size = image_size
        self.patch_size = patch_size
        self.num_channels = num_channels
        self.is_training = is_training
        self.use_labels = use_labels
        self.hidden_size = hidden_size
        self.num_hidden_layers = num_hidden_layers
        self.num_attention_heads = num_attention_heads
        self.intermediate_size = intermediate_size
        self.hidden_act = hidden_act
        self.hidden_dropout_prob = hidden_dropout_prob
        self.attention_probs_dropout_prob = attention_probs_dropout_prob
        self.type_sequence_label_size = type_sequence_label_size
        self.initializer_range = initializer_range
        self.mask_ratio = mask_ratio
        self.scope = scope

        # in ViTMAE, the expected sequence length = (num_patches + 1) * (1 - config.mask_ratio), rounded above
        # (we add 1 for the [CLS] token)
        num_patches = (image_size // patch_size) ** 2
        self.seq_length = int(math.ceil((1 - mask_ratio) * (num_patches + 1)))

    def prepare_config_and_inputs(self):
        pixel_values = floats_tensor([self.batch_size, self.num_channels, self.image_size, self.image_size])

        labels = None
        if self.use_labels:
            labels = ids_tensor([self.batch_size], self.type_sequence_label_size)

        config = self.get_config()

        return config, pixel_values, labels

    def get_config(self):
        return ViTMAEConfig(
            image_size=self.image_size,
            patch_size=self.patch_size,
            num_channels=self.num_channels,
            hidden_size=self.hidden_size,
            num_hidden_layers=self.num_hidden_layers,
            num_attention_heads=self.num_attention_heads,
            intermediate_size=self.intermediate_size,
            decoder_hidden_size=self.hidden_size,
            decoder_num_hidden_layers=self.num_hidden_layers,
            decoder_num_attention_heads=self.num_attention_heads,
            decoder_intermediate_size=self.intermediate_size,
            hidden_act=self.hidden_act,
            hidden_dropout_prob=self.hidden_dropout_prob,
            attention_probs_dropout_prob=self.attention_probs_dropout_prob,
            is_decoder=False,
            initializer_range=self.initializer_range,
            mask_ratio=self.mask_ratio,
        )

    def create_and_check_model(self, config, pixel_values, labels):
        model = TFViTMAEModel(config=config)
        result = model(pixel_values, training=False)
        self.parent.assertEqual(result.last_hidden_state.shape, (self.batch_size, self.seq_length, self.hidden_size))

    def create_and_check_for_pretraining(self, config, pixel_values, labels):
        model = TFViTMAEForPreTraining(config)
        result = model(pixel_values, training=False)
        # expected sequence length = num_patches
        num_patches = (self.image_size // self.patch_size) ** 2
        expected_num_channels = self.patch_size**2 * self.num_channels
        self.parent.assertEqual(result.logits.shape, (self.batch_size, num_patches, expected_num_channels))

        # test greyscale images
        config.num_channels = 1
        model = TFViTMAEForPreTraining(config)

        pixel_values = floats_tensor([self.batch_size, 1, self.image_size, self.image_size])
        result = model(pixel_values, training=False)
        expected_num_channels = self.patch_size**2
        self.parent.assertEqual(result.logits.shape, (self.batch_size, num_patches, expected_num_channels))

    def prepare_config_and_inputs_for_common(self):
        config_and_inputs = self.prepare_config_and_inputs()
        (config, pixel_values, labels) = config_and_inputs
        inputs_dict = {"pixel_values": pixel_values}
        return config, inputs_dict


@require_tf
class TFViTMAEModelTest(TFModelTesterMixin, unittest.TestCase):
    """
    Here we also overwrite some of the tests of test_modeling_common.py, as ViTMAE does not use input_ids, inputs_embeds,
    attention_mask and seq_length.
    """

    all_model_classes = (TFViTMAEModel, TFViTMAEForPreTraining) if is_tf_available() else ()

    test_pruning = False
    test_onnx = False
    test_resize_embeddings = False
    test_head_masking = False

    def setUp(self):
        self.model_tester = TFViTMAEModelTester(self)
        self.config_tester = ConfigTester(self, config_class=ViTMAEConfig, has_text_modality=False, hidden_size=37)

    def test_config(self):
        self.config_tester.run_common_tests()

    @unittest.skip(reason="ViTMAE does not use inputs_embeds")
    def test_inputs_embeds(self):
        pass

    def test_model_common_attributes(self):
        config, _ = self.model_tester.prepare_config_and_inputs_for_common()

        for model_class in self.all_model_classes:
            model = model_class(config)
            self.assertIsInstance(model.get_input_embeddings(), (tf.keras.layers.Layer))
            x = model.get_output_embeddings()
            self.assertTrue(x is None or isinstance(x, tf.keras.layers.Layer))

    def test_forward_signature(self):
        config, _ = self.model_tester.prepare_config_and_inputs_for_common()

        for model_class in self.all_model_classes:
            model = model_class(config)
            signature = inspect.signature(model.call)
            # signature.parameters is an OrderedDict => so arg_names order is deterministic
            arg_names = [*signature.parameters.keys()]

            expected_arg_names = ["pixel_values"]
            self.assertListEqual(arg_names[:1], expected_arg_names)

    def test_model(self):
        config_and_inputs = self.model_tester.prepare_config_and_inputs()
        self.model_tester.create_and_check_model(*config_and_inputs)

    def test_for_pretraining(self):
        config_and_inputs = self.model_tester.prepare_config_and_inputs()
        self.model_tester.create_and_check_for_pretraining(*config_and_inputs)

    # overwrite from common since TFViTMAEForPretraining has random masking, we need to fix the noise
    # to generate masks during test
    def test_keyword_and_dict_args(self):
        # make the mask reproducible
        np.random.seed(2)

        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()

        num_patches = int((config.image_size // config.patch_size) ** 2)
        noise = np.random.uniform(size=(self.model_tester.batch_size, num_patches))

        for model_class in self.all_model_classes:
            model = model_class(config)
            inputs = self._prepare_for_class(inputs_dict, model_class)

            outputs_dict = model(inputs, noise=noise)

            inputs_keywords = copy.deepcopy(self._prepare_for_class(inputs_dict, model_class))
            outputs_keywords = model(**inputs_keywords, noise=noise)
            output_dict = outputs_dict[0].numpy()
            output_keywords = outputs_keywords[0].numpy()

            self.assertLess(np.sum(np.abs(output_dict - output_keywords)), 1e-6)

    # overwrite from common since TFViTMAEForPretraining has random masking, we need to fix the noise
    # to generate masks during test
    def test_numpy_arrays_inputs(self):
        # make the mask reproducible
        np.random.seed(2)

        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()

        num_patches = int((config.image_size // config.patch_size) ** 2)
        noise = np.random.uniform(size=(self.model_tester.batch_size, num_patches))

        def prepare_numpy_arrays(inputs_dict):
            inputs_np_dict = {}
            for k, v in inputs_dict.items():
                if tf.is_tensor(v):
                    inputs_np_dict[k] = v.numpy()
                else:
                    inputs_np_dict[k] = np.array(k)

            return inputs_np_dict

        for model_class in self.all_model_classes:
            model = model_class(config)

            inputs = self._prepare_for_class(inputs_dict, model_class)
            inputs_np = prepare_numpy_arrays(inputs)

            output_for_dict_input = model(inputs_np, noise=noise)
            output_for_kw_input = model(**inputs_np, noise=noise)
            self.assert_outputs_same(output_for_dict_input, output_for_kw_input)

    # overwrite from common since TFViTMAEForPretraining has random masking, we need to fix the noise
    # to generate masks during test
    def check_pt_tf_models(self, tf_model, pt_model, tf_inputs_dict):

        # make masks reproducible
        np.random.seed(2)

        num_patches = int((tf_model.config.image_size // tf_model.config.patch_size) ** 2)
        noise = np.random.uniform(size=(self.model_tester.batch_size, num_patches))
        tf_noise = tf.constant(noise)

        # Add `noise` argument.
        # PT inputs will be prepared in `super().check_pt_tf_models()` with this added `noise` argument
        tf_inputs_dict["noise"] = tf_noise

        super().check_pt_tf_models(tf_model, pt_model, tf_inputs_dict)

    # overwrite from common since TFViTMAEForPretraining outputs loss along with
    # logits and mask indices. loss and mask indices are not suitable for integration
    # with other keras modules.
    def test_compile_tf_model(self):
        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()
        optimizer = tf.keras.optimizers.Adam(learning_rate=3e-5, epsilon=1e-08, clipnorm=1.0)
        loss = tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True)
        metric = tf.keras.metrics.SparseCategoricalAccuracy("accuracy")

        for model_class in self.all_model_classes:
            # `pixel_values` implies that the input is an image
            inputs = tf.keras.Input(
                batch_shape=(
                    3,
                    self.model_tester.num_channels,
                    self.model_tester.image_size,
                    self.model_tester.image_size,
                ),
                name="pixel_values",
                dtype="float32",
            )

            # Prepare our model
            model = model_class(config)
            model(self._prepare_for_class(inputs_dict, model_class))  # Model must be called before saving.
            # Let's load it from the disk to be sure we can use pretrained weights
            with tempfile.TemporaryDirectory() as tmpdirname:
                model.save_pretrained(tmpdirname, saved_model=False)
                model = model_class.from_pretrained(tmpdirname)

            outputs_dict = model(inputs)
            hidden_states = outputs_dict[0]

            # `TFViTMAEForPreTraining` outputs are not recommended to be used for
            #  downstream application. This is just to check if the outputs of
            # `TFViTMAEForPreTraining` can be integrated with other keras modules.
            if model_class.__name__ == "TFViTMAEForPreTraining":
                hidden_states = outputs_dict["logits"]

            # Add a dense layer on top to test integration with other keras modules
            outputs = tf.keras.layers.Dense(2, activation="softmax", name="outputs")(hidden_states)

            # Compile extended model
            extended_model = tf.keras.Model(inputs=[inputs], outputs=[outputs])
            extended_model.compile(optimizer=optimizer, loss=loss, metrics=[metric])

    # overwrite from common since TFViTMAEForPretraining has random masking, we need to fix the noise
    # to generate masks during test
    def test_keras_save_load(self):
        # make mask reproducible
        np.random.seed(2)

        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()

        tf_main_layer_classes = set(
            module_member
            for model_class in self.all_model_classes
            for module in (import_module(model_class.__module__),)
            for module_member_name in dir(module)
            if module_member_name.endswith("MainLayer")
            # This condition is required, since `modeling_tf_clip.py` has 3 classes whose names end with `MainLayer`.
            and module_member_name[: -len("MainLayer")] == model_class.__name__[: -len("Model")]
            for module_member in (getattr(module, module_member_name),)
            if isinstance(module_member, type)
            and tf.keras.layers.Layer in module_member.__bases__
            and getattr(module_member, "_keras_serializable", False)
        )

        num_patches = int((config.image_size // config.patch_size) ** 2)
        noise = np.random.uniform(size=(self.model_tester.batch_size, num_patches))
        noise = tf.convert_to_tensor(noise)
        inputs_dict.update({"noise": noise})

        for main_layer_class in tf_main_layer_classes:
            main_layer = main_layer_class(config)

            symbolic_inputs = {
                name: tf.keras.Input(tensor.shape[1:], dtype=tensor.dtype) for name, tensor in inputs_dict.items()
            }

            model = tf.keras.Model(symbolic_inputs, outputs=main_layer(symbolic_inputs))
            outputs = model(inputs_dict)

            with tempfile.TemporaryDirectory() as tmpdirname:
                filepath = os.path.join(tmpdirname, "keras_model.h5")
                model.save(filepath)
                model = tf.keras.models.load_model(
                    filepath, custom_objects={main_layer_class.__name__: main_layer_class}
                )
                assert isinstance(model, tf.keras.Model)
                after_outputs = model(inputs_dict)
                self.assert_outputs_same(after_outputs, outputs)

    # overwrite from common since TFViTMAEForPretraining has random masking, we need to fix the noise
    # to generate masks during test
    @slow
    def test_save_load(self):
        # make mask reproducible
        np.random.seed(2)

        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()

        num_patches = int((config.image_size // config.patch_size) ** 2)
        noise = np.random.uniform(size=(self.model_tester.batch_size, num_patches))

        for model_class in self.all_model_classes:
            model = model_class(config)
            model_input = self._prepare_for_class(inputs_dict, model_class)
            outputs = model(model_input, noise=noise)

            if model_class.__name__ == "TFViTMAEModel":
                out_2 = outputs.last_hidden_state.numpy()
                out_2[np.isnan(out_2)] = 0
            else:
                out_2 = outputs.logits.numpy()
                out_2[np.isnan(out_2)] = 0

            with tempfile.TemporaryDirectory() as tmpdirname:
                model.save_pretrained(tmpdirname, saved_model=False)
                model = model_class.from_pretrained(tmpdirname)
                after_outputs = model(model_input, noise=noise)

                if model_class.__name__ == "TFViTMAEModel":
                    out_1 = after_outputs["last_hidden_state"].numpy()
                    out_1[np.isnan(out_1)] = 0
                else:
                    out_1 = after_outputs["logits"].numpy()
                    out_1[np.isnan(out_1)] = 0

                max_diff = np.amax(np.abs(out_1 - out_2))
                self.assertLessEqual(max_diff, 1e-5)

    # overwrite from common since TFViTMAEForPretraining has random masking, we need to fix the noise
    # to generate masks during test
    def test_save_load_config(self):
        # make mask reproducible
        np.random.seed(2)

        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()

        num_patches = int((config.image_size // config.patch_size) ** 2)
        noise = np.random.uniform(size=(self.model_tester.batch_size, num_patches))

        for model_class in self.all_model_classes:
            model = model_class(config)
            model_inputs = self._prepare_for_class(inputs_dict, model_class)

            outputs = model(model_inputs, noise=noise)
            model_config = model.get_config()
            # make sure that returned config is jsonifiable, which is required by keras
            json.dumps(model_config)
            new_model = model_class.from_config(model.get_config())
            # make sure it also accepts a normal config
            _ = model_class.from_config(model.config)
            _ = new_model(model_inputs)  # Build model
            new_model.set_weights(model.get_weights())
            after_outputs = new_model(model_inputs, noise=noise)

            self.assert_outputs_same(after_outputs, outputs)

    @unittest.skip(
        reason="""ViTMAE returns a random mask + ids_restore in each forward pass. See test_save_load
    to get deterministic results."""
    )
    def test_determinism(self):
        pass

    @unittest.skip(reason="""ViTMAE returns a random mask + ids_restore in each forward pass. See test_save_load""")
    def test_model_outputs_equivalence(self):
        pass

    @slow
    def test_model_from_pretrained(self):

        model = TFViTMAEModel.from_pretrained("google/vit-base-patch16-224")
        self.assertIsNotNone(model)


# We will verify our results on an image of cute cats
def prepare_img():
    image = Image.open("./tests/fixtures/tests_samples/COCO/000000039769.png")
    return image


@require_tf
@require_vision
class TFViTMAEModelIntegrationTest(unittest.TestCase):
    @cached_property
    def default_feature_extractor(self):
        return ViTFeatureExtractor.from_pretrained("facebook/vit-mae-base") if is_vision_available() else None

    @slow
    def test_inference_for_pretraining(self):
        # make random mask reproducible across the PT and TF model
        np.random.seed(2)

        model = TFViTMAEForPreTraining.from_pretrained("facebook/vit-mae-base")

        feature_extractor = self.default_feature_extractor
        image = prepare_img()
        inputs = feature_extractor(images=image, return_tensors="tf")

        # prepare a noise vector that will be also used for testing the TF model
        # (this way we can ensure that the PT and TF models operate on the same inputs)
        vit_mae_config = ViTMAEConfig()
        num_patches = int((vit_mae_config.image_size // vit_mae_config.patch_size) ** 2)
        noise = np.random.uniform(size=(1, num_patches))

        # forward pass
        outputs = model(**inputs, noise=noise)

        # verify the logits
        expected_shape = tf.convert_to_tensor([1, 196, 768])
        self.assertEqual(outputs.logits.shape, expected_shape)

        expected_slice = tf.convert_to_tensor(
            [[-0.0548, -1.7023, -0.9325], [0.3721, -0.5670, -0.2233], [0.8235, -1.3878, -0.3524]]
        )

        tf.debugging.assert_near(outputs.logits[0, :3, :3], expected_slice, atol=1e-4)
