# coding=utf-8
# Copyright 2018 Salesforce and HuggingFace Inc. team.
# 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.


import unittest

from transformers import is_torch_available

from .test_configuration_common import ConfigTester
from .test_modeling_common import ModelTesterMixin, ids_tensor
from .utils import CACHE_DIR, require_torch, slow, torch_device


if is_torch_available():
    import torch
    from transformers import CTRLConfig, CTRLModel, CTRL_PRETRAINED_MODEL_ARCHIVE_MAP, CTRLLMHeadModel


@require_torch
class CTRLModelTest(ModelTesterMixin, unittest.TestCase):

    all_model_classes = (CTRLModel, CTRLLMHeadModel) if is_torch_available() else ()
    all_generative_model_classes = (CTRLLMHeadModel,) if is_torch_available() else ()
    test_pruning = False
    test_torchscript = False
    test_resize_embeddings = False
    test_head_masking = False

    class CTRLModelTester(object):
        def __init__(
            self,
            parent,
            batch_size=13,
            seq_length=7,
            is_training=True,
            use_token_type_ids=True,
            use_input_mask=True,
            use_labels=True,
            use_mc_token_ids=True,
            vocab_size=99,
            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,
            max_position_embeddings=512,
            type_vocab_size=16,
            type_sequence_label_size=2,
            initializer_range=0.02,
            num_labels=3,
            num_choices=4,
            scope=None,
        ):
            self.parent = parent
            self.batch_size = batch_size
            self.seq_length = seq_length
            self.is_training = is_training
            self.use_token_type_ids = use_token_type_ids
            self.use_input_mask = use_input_mask
            self.use_labels = use_labels
            self.use_mc_token_ids = use_mc_token_ids
            self.vocab_size = vocab_size
            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.max_position_embeddings = max_position_embeddings
            self.type_vocab_size = type_vocab_size
            self.type_sequence_label_size = type_sequence_label_size
            self.initializer_range = initializer_range
            self.num_labels = num_labels
            self.num_choices = num_choices
            self.scope = scope

        def prepare_config_and_inputs(self):
            input_ids = ids_tensor([self.batch_size, self.seq_length], self.vocab_size)

            input_mask = None
            if self.use_input_mask:
                input_mask = ids_tensor([self.batch_size, self.seq_length], vocab_size=2)

            token_type_ids = None
            if self.use_token_type_ids:
                token_type_ids = ids_tensor([self.batch_size, self.seq_length], self.type_vocab_size)

            mc_token_ids = None
            if self.use_mc_token_ids:
                mc_token_ids = ids_tensor([self.batch_size, self.num_choices], self.seq_length)

            sequence_labels = None
            token_labels = None
            choice_labels = None
            if self.use_labels:
                sequence_labels = ids_tensor([self.batch_size], self.type_sequence_label_size)
                token_labels = ids_tensor([self.batch_size, self.seq_length], self.num_labels)
                choice_labels = ids_tensor([self.batch_size], self.num_choices)

            config = CTRLConfig(
                vocab_size=self.vocab_size,
                n_embd=self.hidden_size,
                n_layer=self.num_hidden_layers,
                n_head=self.num_attention_heads,
                # 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,
                n_positions=self.max_position_embeddings,
                n_ctx=self.max_position_embeddings
                # type_vocab_size=self.type_vocab_size,
                # initializer_range=self.initializer_range
            )

            head_mask = ids_tensor([self.num_hidden_layers, self.num_attention_heads], 2)

            return (
                config,
                input_ids,
                input_mask,
                head_mask,
                token_type_ids,
                mc_token_ids,
                sequence_labels,
                token_labels,
                choice_labels,
            )

        def check_loss_output(self, result):
            self.parent.assertListEqual(list(result["loss"].size()), [])

        def create_and_check_ctrl_model(self, config, input_ids, input_mask, head_mask, token_type_ids, *args):
            model = CTRLModel(config=config)
            model.to(torch_device)
            model.eval()

            model(input_ids, token_type_ids=token_type_ids, head_mask=head_mask)
            model(input_ids, token_type_ids=token_type_ids)
            sequence_output, presents = model(input_ids)

            result = {
                "sequence_output": sequence_output,
                "presents": presents,
            }
            self.parent.assertListEqual(
                list(result["sequence_output"].size()), [self.batch_size, self.seq_length, self.hidden_size]
            )
            self.parent.assertEqual(len(result["presents"]), config.n_layer)

        def create_and_check_lm_head_model(self, config, input_ids, input_mask, head_mask, token_type_ids, *args):
            model = CTRLLMHeadModel(config)
            model.to(torch_device)
            model.eval()

            loss, lm_logits, _ = model(input_ids, token_type_ids=token_type_ids, labels=input_ids)

            result = {"loss": loss, "lm_logits": lm_logits}
            self.parent.assertListEqual(list(result["loss"].size()), [])
            self.parent.assertListEqual(
                list(result["lm_logits"].size()), [self.batch_size, self.seq_length, self.vocab_size]
            )

        def prepare_config_and_inputs_for_common(self):
            config_and_inputs = self.prepare_config_and_inputs()

            (
                config,
                input_ids,
                input_mask,
                head_mask,
                token_type_ids,
                mc_token_ids,
                sequence_labels,
                token_labels,
                choice_labels,
            ) = config_and_inputs

            inputs_dict = {"input_ids": input_ids, "token_type_ids": token_type_ids, "head_mask": head_mask}

            return config, inputs_dict

    def setUp(self):
        self.model_tester = CTRLModelTest.CTRLModelTester(self)
        self.config_tester = ConfigTester(self, config_class=CTRLConfig, n_embd=37)

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

    def test_ctrl_model(self):
        config_and_inputs = self.model_tester.prepare_config_and_inputs()
        self.model_tester.create_and_check_ctrl_model(*config_and_inputs)

    def test_ctrl_lm_head_model(self):
        config_and_inputs = self.model_tester.prepare_config_and_inputs()
        self.model_tester.create_and_check_lm_head_model(*config_and_inputs)

    @slow
    def test_model_from_pretrained(self):
        for model_name in list(CTRL_PRETRAINED_MODEL_ARCHIVE_MAP.keys())[:1]:
            model = CTRLModel.from_pretrained(model_name, cache_dir=CACHE_DIR)
            self.assertIsNotNone(model)


class CTRLModelLanguageGenerationTest(unittest.TestCase):
    @slow
    def test_lm_generate_ctrl(self):
        model = CTRLLMHeadModel.from_pretrained("ctrl")
        input_ids = torch.Tensor([[11859, 586, 20984, 8]]).long()  # Legal My neighbor is
        expected_output_ids = [
            11859,
            586,
            20984,
            8,
            13391,
            3,
            980,
            8258,
            72,
            327,
            148,
            2,
            53,
            29,
            226,
            3,
            780,
            49,
            3,
            980,
        ]  # Legal My neighbor is refusing to pay rent after 2 years and we are having to force him to pay
        torch.manual_seed(0)

        output_ids = model.generate(input_ids)
        self.assertListEqual(output_ids[0].tolist(), expected_output_ids)
