# coding=utf-8
# Copyright 2024 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.
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"""Testing suite for the PyTorch Qwen2-VL model."""

import gc
import unittest

import requests

from transformers import (
    AutoProcessor,
    Qwen2VLConfig,
    Qwen2VLForConditionalGeneration,
    is_torch_available,
    is_vision_available,
)
from transformers.testing_utils import (
    require_flash_attn,
    require_torch,
    require_torch_gpu,
    slow,
    torch_device,
)

from ...generation.test_utils import GenerationTesterMixin
from ...test_configuration_common import ConfigTester
from ...test_modeling_common import (
    ModelTesterMixin,
    _config_zero_init,
    floats_tensor,
    ids_tensor,
)


if is_torch_available():
    import torch


if is_vision_available():
    from PIL import Image


class Qwen2VLVisionText2TextModelTester:
    def __init__(
        self,
        parent,
        batch_size=3,
        seq_length=7,
        num_channels=3,
        ignore_index=-100,
        image_size=14,
        bos_token_id=0,
        eos_token_id=1,
        pad_token_id=2,
        vision_start_token_id=3,
        image_token_id=4,
        video_token_id=5,
        hidden_act="silu",
        hidden_size=32,
        vocab_size=99,
        intermediate_size=37,
        max_position_embeddings=512,
        max_window_layers=3,
        model_type="qwen2_vl",
        num_attention_heads=4,
        num_hidden_layers=4,
        num_key_value_heads=2,
        rope_theta=10000,
        tie_word_embeddings=True,
        is_training=True,
        vision_config={
            "depth": 2,
            "embed_dim": 32,
            "hidden_act": "quick_gelu",
            "hidden_size": 32,
            "mlp_ratio": 4,
            "num_heads": 4,
            "patch_size": 14,
            "spatial_merge_size": 1,
            "temporal_patch_size": 2,
        },
        rope_scaling={"type": "mrope", "mrope_section": [2, 1, 1]},
    ):
        self.parent = parent
        self.ignore_index = ignore_index
        self.bos_token_id = bos_token_id
        self.eos_token_id = eos_token_id
        self.pad_token_id = pad_token_id
        self.vision_start_token_id = vision_start_token_id
        self.image_token_id = image_token_id
        self.video_token_id = video_token_id
        self.hidden_act = hidden_act
        self.hidden_size = hidden_size
        self.intermediate_size = intermediate_size
        self.max_position_embeddings = max_position_embeddings
        self.max_window_layers = max_window_layers
        self.model_type = model_type
        self.num_attention_heads = num_attention_heads
        self.num_hidden_layers = num_hidden_layers
        self.num_key_value_heads = num_key_value_heads
        self.rope_theta = rope_theta
        self.tie_word_embeddings = tie_word_embeddings
        self.vision_config = vision_config
        self.rope_scaling = rope_scaling
        self.batch_size = batch_size
        self.num_channels = num_channels
        self.image_size = image_size
        self.is_training = is_training
        self.vocab_size = vocab_size
        self.num_image_tokens = 32
        self.seq_length = seq_length + self.num_image_tokens

    def get_config(self):
        return Qwen2VLConfig(
            hidden_size=self.hidden_size,
            intermediate_size=self.intermediate_size,
            num_hidden_layers=self.num_hidden_layers,
            num_attention_heads=self.num_attention_heads,
            num_key_value_heads=self.num_key_value_heads,
            hidden_act=self.hidden_act,
            max_position_embeddings=self.max_position_embeddings,
            vision_config=self.vision_config,
            model_type=self.model_type,
            max_window_layers=self.max_window_layers,
            rope_scaling=self.rope_scaling,
            tie_word_embeddings=self.tie_word_embeddings,
            bos_token_id=self.bos_token_id,
            eos_token_id=self.eos_token_id,
            pad_token_id=self.pad_token_id,
            vision_start_token_id=self.vision_start_token_id,
            image_token_id=self.image_token_id,
            video_token_id=self.video_token_id,
            vocab_size=self.vocab_size,
        )

    def prepare_config_and_inputs(self):
        config = self.get_config()
        patch_size = config.vision_config.patch_size
        temporal_patch_size = config.vision_config.temporal_patch_size
        pixel_values = floats_tensor(
            [
                self.batch_size * (self.image_size**2) // (patch_size**2),
                self.num_channels * (patch_size**2) * temporal_patch_size,
            ]
        )

        return config, pixel_values

    def prepare_config_and_inputs_for_common(self):
        config_and_inputs = self.prepare_config_and_inputs()
        config, pixel_values = config_and_inputs
        input_ids = ids_tensor([self.batch_size, self.seq_length], self.vocab_size)
        attention_mask = torch.ones(input_ids.shape, dtype=torch.long, device=torch_device)

        input_ids[:, -1] = self.pad_token_id
        input_ids[input_ids == self.video_token_id] = self.pad_token_id
        input_ids[input_ids == self.image_token_id] = self.pad_token_id
        input_ids[:, self.num_image_tokens] = self.image_token_id
        labels = torch.zeros(
            (self.batch_size, self.seq_length),
            dtype=torch.long,
            device=torch_device,
        )
        inputs_dict = {
            "pixel_values": pixel_values,
            "image_grid_thw": torch.tensor([[1, 1, 1]] * self.batch_size),
            "input_ids": input_ids,
            "attention_mask": attention_mask,
            "labels": labels,
        }
        return config, inputs_dict

    def create_and_check_qwen2_vl_model_fp16_forward(
        self, config, input_ids, pixel_values, attention_mask, image_grid_thw
    ):
        model = Qwen2VLForConditionalGeneration(config=config)
        model.to(torch_device)
        model.half()
        model.eval()
        logits = model(
            input_ids=input_ids,
            attention_mask=attention_mask,
            image_grid_thw=image_grid_thw,
            pixel_values=pixel_values.to(torch.bfloat16),
            return_dict=True,
        )["logits"]
        self.parent.assertFalse(torch.isnan(logits).any().item())

    def create_and_check_qwen2_vl_model_fp16_autocast_forward(
        self, config, input_ids, pixel_values, attention_mask, image_grid_thw
    ):
        config.torch_dtype = torch.float16
        model = Qwen2VLForConditionalGeneration(config=config)
        model.to(torch_device)
        model.eval()
        with torch.autocast(device_type="cuda", dtype=torch.float16):
            logits = model(
                input_ids=input_ids,
                attention_mask=attention_mask,
                image_grid_thw=image_grid_thw,
                pixel_values=pixel_values.to(torch.bfloat16),
                return_dict=True,
            )["logits"]
        self.parent.assertFalse(torch.isnan(logits).any().item())


@require_torch
class Qwen2VLModelTest(ModelTesterMixin, GenerationTesterMixin, unittest.TestCase):
    """
    Model tester for `Qwen2VLForConditionalGeneration`.
    """

    all_model_classes = (Qwen2VLForConditionalGeneration,) if is_torch_available() else ()
    all_generative_model_classes = (Qwen2VLForConditionalGeneration,) if is_torch_available() else ()
    pipeline_model_mapping = {"image-text-to-text": Qwen2VLForConditionalGeneration}
    test_pruning = False
    test_head_masking = False
    _is_composite = True

    def setUp(self):
        self.model_tester = Qwen2VLVisionText2TextModelTester(self)
        self.config_tester = ConfigTester(self, config_class=Qwen2VLConfig, has_text_modality=False)

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

    def test_initialization(self):
        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()

        configs_no_init = _config_zero_init(config)
        for model_class in self.all_model_classes:
            model = model_class(config=configs_no_init)
            for name, param in model.named_parameters():
                if param.requires_grad:
                    self.assertIn(
                        ((param.data.mean() * 1e9).round() / 1e9).item(),
                        [0.0, 1.0],
                        msg=f"Parameter {name} of model {model_class} seems not properly initialized",
                    )

    def test_mismatching_num_image_tokens(self):
        """
        Tests that VLMs through an error with explicit message saying what is wrong
        when number of images don't match number of image tokens in the text.
        Also we need to test multi-image cases when one prompt has multiple image tokens.
        """
        config, input_dict = self.model_tester.prepare_config_and_inputs_for_common()
        for model_class in self.all_model_classes:
            model = model_class(config).to(torch_device)
            _ = model(**input_dict)  # successfull forward with no modifications

            # remove one image but leave the image token in text
            patch_size = config.vision_config.patch_size
            one_img_length = (self.model_tester.image_size**2) // (patch_size**2)
            input_dict["pixel_values"] = input_dict["pixel_values"][-one_img_length:, ...]
            input_dict["image_grid_thw"] = input_dict["image_grid_thw"][-1:, ...]
            with self.assertRaises(ValueError):
                _ = model(**input_dict)

            # simulate multi-image case by concatenating inputs where each has exactly one image/image-token
            input_ids = input_dict["input_ids"][:1]
            pixel_values = input_dict["pixel_values"][:one_img_length]
            image_grid_thw = input_dict["image_grid_thw"][:1]
            input_ids = torch.cat([input_ids, input_ids], dim=0)

            # one image and two image tokens raise an error
            with self.assertRaises(ValueError):
                _ = model(input_ids=input_ids, pixel_values=pixel_values, image_grid_thw=image_grid_thw)

            # two images and two image tokens don't raise an error
            pixel_values = torch.cat([pixel_values, pixel_values], dim=0)
            image_grid_thw = torch.cat([image_grid_thw, image_grid_thw], dim=0)
            _ = model(input_ids=input_ids, pixel_values=pixel_values, image_grid_thw=image_grid_thw)

    def test_forward_with_rope_deltas_cached(self):
        """
        Tests that Qwen2-VL computes new rope deltas every forward pass with new set of inputs.
        Rope deltas are cached when we generate and re-used for decoding phase, byt are not reset
        automatically after generation ends. See https://github.com/huggingface/transformers/pull/36013 for more
        """
        config, input_dict = self.model_tester.prepare_config_and_inputs_for_common()
        for model_class in self.all_generative_model_classes:
            model = model_class(config).to(torch_device)

            # Generate and make sure rope_deltas are not `None`
            self.assertTrue(model.rope_deltas is None)
            generation_output = model.generate(
                **input_dict, max_new_tokens=4, return_dict_in_generate=True, output_logits=True
            )
            self.assertTrue(model.rope_deltas is not None)

            # Now if we try to do forward pass, we should get new rope logits, because cache is not passed
            forward_output = model(**input_dict)
            torch.testing.assert_close(
                generation_output.logits[0], forward_output.logits[:, -1, :], rtol=1e-4, atol=1e-4
            )

    @unittest.skip(reason="Feedforward chunking is not yet supported")
    def test_feed_forward_chunking(self):
        pass

    @unittest.skip(reason="CPU offload is not yet supported")
    def test_cpu_offload(self):
        pass

    @unittest.skip(reason="Some undefined behavior encountered with test versions of this model. Skip for now.")
    def test_disk_offload_bin(self):
        pass

    @unittest.skip(reason="Some undefined behavior encountered with test versions of this model. Skip for now.")
    def test_disk_offload_safetensors(self):
        pass

    @unittest.skip(reason="Some undefined behavior encountered with test versions of this model. Skip for now.")
    def test_model_parallelism(self):
        pass

    @unittest.skip(reason="Compile not yet supported because in Qwen2VL models")
    def test_sdpa_can_compile_dynamic(self):
        pass

    @unittest.skip(reason="Compile not yet supported because in Qwen2VL models")
    def test_sdpa_can_dispatch_on_flash(self):
        pass

    @unittest.skip(reason="Got `CUDA error: misaligned address` with PyTorch 2.0.0.")
    def test_multi_gpu_data_parallel_forward(self):
        pass

    @unittest.skip(reason="We cannot configure to output a smaller model.")
    def test_model_is_small(self):
        pass

    @unittest.skip(
        reason="Qwen2-VL can't do low-memory generation because position IDs have extra dimension and split function doesn't work for that"
    )
    def test_beam_search_low_memory(self):
        pass

    @unittest.skip(
        reason="VLMs can't generate from inputs embeds and pixels. This can be tested as part of bacbone LM, no need to run the test for VLMs"
    )
    def test_generate_from_inputs_embeds_with_static_cache(self):
        pass


@require_torch
class Qwen2VLIntegrationTest(unittest.TestCase):
    def setUp(self):
        self.processor = AutoProcessor.from_pretrained("Qwen/Qwen2-VL-7B-Instruct")
        self.messages = [
            {
                "role": "user",
                "content": [
                    {"type": "image"},
                    {"type": "text", "text": "What kind of dog is this?"},
                ],
            }
        ]
        url = "https://qianwen-res.oss-accelerate-overseas.aliyuncs.com/Qwen2-VL/demo_small.jpg"
        self.image = Image.open(requests.get(url, stream=True).raw)

    def tearDown(self):
        gc.collect()
        torch.cuda.empty_cache()

    @slow
    def test_small_model_integration_test(self):
        model = Qwen2VLForConditionalGeneration.from_pretrained(
            "Qwen/Qwen2-VL-7B-Instruct", torch_dtype="auto", device_map="auto"
        )

        text = self.processor.apply_chat_template(self.messages, tokenize=False, add_generation_prompt=True)
        inputs = self.processor(text=[text], images=[self.image], return_tensors="pt")

        expected_input_ids = [151644, 8948, 198, 2610, 525, 264, 10950, 17847, 13, 151645, 198, 151644, 872, 198, 151652, 151655, 151655]  # fmt: skip
        assert expected_input_ids == inputs.input_ids[0].tolist()[:17]

        expected_pixel_slice = torch.tensor(
            [
                [0.8792, 0.8792, 0.9084],
                [1.1858, 1.1858, 1.2296],
                [1.2004, 1.2004, 1.2150],
                [1.4340, 1.4340, 1.4194],
                [1.3902, 1.4048, 1.4194],
                [1.5216, 1.5362, 1.5362],
            ],
            dtype=torch.float32,
            device="cpu",
        )
        assert torch.allclose(expected_pixel_slice, inputs.pixel_values[:6, :3], atol=3e-3)

        # verify generation
        inputs = inputs.to(torch_device)

        output = model.generate(**inputs, max_new_tokens=30)
        EXPECTED_DECODED_TEXT = "system\nYou are a helpful assistant.\nuser\nWhat kind of dog is this?\nassistant\nThe dog in the picture appears to be a Labrador Retriever. Labradors are known for their friendly and intelligent nature, making them popular choices"

        self.assertEqual(
            self.processor.decode(output[0], skip_special_tokens=True),
            EXPECTED_DECODED_TEXT,
        )

    @slow
    def test_small_model_integration_test_batch(self):
        model = Qwen2VLForConditionalGeneration.from_pretrained(
            "Qwen/Qwen2-VL-7B-Instruct", torch_dtype="auto", device_map="auto"
        )
        text = self.processor.apply_chat_template(self.messages, tokenize=False, add_generation_prompt=True)
        inputs = self.processor(text=[text, text], images=[self.image, self.image], return_tensors="pt").to(
            torch_device
        )

        # it should not matter whether two images are the same size or not
        output = model.generate(**inputs, max_new_tokens=30)

        EXPECTED_DECODED_TEXT = [
            'system\nYou are a helpful assistant.\nuser\nWhat kind of dog is this?\nassistant\nThe dog in the picture appears to be a Labrador Retriever. Labradors are known for their friendly and intelligent nature, making them popular choices',
            'system\nYou are a helpful assistant.\nuser\nWhat kind of dog is this?\nassistant\nThe dog in the picture appears to be a Labrador Retriever. Labradors are known for their friendly and intelligent nature, making them popular choices',
        ]  # fmt: skip
        self.assertEqual(
            self.processor.batch_decode(output, skip_special_tokens=True),
            EXPECTED_DECODED_TEXT,
        )

    @slow
    def test_small_model_integration_test_batch_wo_image(self):
        model = Qwen2VLForConditionalGeneration.from_pretrained(
            "Qwen/Qwen2-VL-7B-Instruct", torch_dtype="auto", device_map="auto"
        )
        text = self.processor.apply_chat_template(self.messages, tokenize=False, add_generation_prompt=True)
        messages2 = [
            {"role": "system", "content": "You are a helpful assistant."},
            {"role": "user", "content": "Who are you?"},
        ]
        text2 = self.processor.apply_chat_template(messages2, tokenize=False, add_generation_prompt=True)
        inputs = self.processor(text=[text, text2], images=[self.image], padding=True, return_tensors="pt").to(
            torch_device
        )

        # it should not matter whether two images are the same size or not
        output = model.generate(**inputs, max_new_tokens=30)

        EXPECTED_DECODED_TEXT = [
            'system\nYou are a helpful assistant.\nuser\nWhat kind of dog is this?\nassistant\nThe dog in the picture appears to be a Labrador Retriever. Labradors are known for their friendly and intelligent nature, making them popular choices',
            'system\nYou are a helpful assistant.\nuser\nWho are you?\nassistant\nI am a large language model created by Alibaba Cloud. I am called Qwen.'
        ]  # fmt: skip
        self.assertEqual(
            self.processor.batch_decode(output, skip_special_tokens=True),
            EXPECTED_DECODED_TEXT,
        )

    @slow
    def test_small_model_integration_test_batch_different_resolutions(self):
        model = Qwen2VLForConditionalGeneration.from_pretrained(
            "Qwen/Qwen2-VL-7B-Instruct", torch_dtype="auto", device_map="auto"
        )
        text = self.processor.apply_chat_template(self.messages, tokenize=False, add_generation_prompt=True)
        text2 = self.processor.apply_chat_template(self.messages, tokenize=False, add_generation_prompt=True)
        image2 = self.image.resize((224, 224))
        inputs = self.processor(text=[text, text2], images=[self.image, image2], padding=True, return_tensors="pt").to(
            torch_device
        )

        # it should not matter whether two images are the same size or not
        output = model.generate(**inputs, max_new_tokens=30)

        EXPECTED_DECODED_TEXT = [
            'system\nYou are a helpful assistant.\nuser\nWhat kind of dog is this?\nassistant\nThe dog in the picture appears to be a Labrador Retriever. Labradors are known for their friendly and intelligent nature, making them popular choices',
            'system\nYou are a helpful assistant.\nuser\nWhat kind of dog is this?\nassistant\nThe dog in the picture appears to be a Labrador Retriever. Labradors are known for their friendly and intelligent nature, making them popular pets'
        ]  # fmt: skip
        self.assertEqual(
            self.processor.batch_decode(output, skip_special_tokens=True),
            EXPECTED_DECODED_TEXT,
        )

    @slow
    @require_flash_attn
    @require_torch_gpu
    def test_small_model_integration_test_batch_flashatt2(self):
        model = Qwen2VLForConditionalGeneration.from_pretrained(
            "Qwen/Qwen2-VL-7B-Instruct",
            torch_dtype=torch.bfloat16,
            attn_implementation="flash_attention_2",
            device_map="auto",
        )
        text = self.processor.apply_chat_template(self.messages, tokenize=False, add_generation_prompt=True)
        inputs = self.processor(text=[text, text], images=[self.image, self.image], return_tensors="pt").to(
            torch_device
        )

        # it should not matter whether two images are the same size or not
        output = model.generate(**inputs, max_new_tokens=30)

        EXPECTED_DECODED_TEXT = [
            "system\nYou are a helpful assistant.\nuser\nWhat kind of dog is this?\nassistant\nThe dog in the picture appears to be a Labrador Retriever. Labradors are known for their friendly and intelligent nature, making them popular choices",
            "system\nYou are a helpful assistant.\nuser\nWhat kind of dog is this?\nassistant\nThe dog in the picture appears to be a Labrador Retriever. Labradors are known for their friendly and intelligent nature, making them popular choices",
        ]
        self.assertEqual(
            self.processor.batch_decode(output, skip_special_tokens=True),
            EXPECTED_DECODED_TEXT,
        )

    @slow
    @require_flash_attn
    @require_torch_gpu
    def test_small_model_integration_test_batch_wo_image_flashatt2(self):
        model = Qwen2VLForConditionalGeneration.from_pretrained(
            "Qwen/Qwen2-VL-7B-Instruct",
            torch_dtype=torch.bfloat16,
            attn_implementation="flash_attention_2",
            device_map="auto",
        )
        text = self.processor.apply_chat_template(self.messages, tokenize=False, add_generation_prompt=True)
        messages2 = [
            {"role": "system", "content": "You are a helpful assistant."},
            {"role": "user", "content": "Who are you?"},
        ]
        text2 = self.processor.apply_chat_template(messages2, tokenize=False, add_generation_prompt=True)
        inputs = self.processor(text=[text, text2], images=[self.image], padding=True, return_tensors="pt").to(
            torch_device
        )

        # it should not matter whether two images are the same size or not
        output = model.generate(**inputs, max_new_tokens=30)

        EXPECTED_DECODED_TEXT = [
            'system\nYou are a helpful assistant.\nuser\nWhat kind of dog is this?\nassistant\nThe dog in the picture appears to be a Labrador Retriever. Labradors are known for their friendly and intelligent nature, making them popular choices',
            'system\nYou are a helpful assistant.\nuser\nWho are you?\nassistant\nI am a large language model created by Alibaba Cloud. I am called Qwen.'
        ]  # fmt: skip

        self.assertEqual(
            self.processor.batch_decode(output, skip_special_tokens=True),
            EXPECTED_DECODED_TEXT,
        )
