# coding=utf-8
# Copyright 2022 HuggingFace Inc.
#
# 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 gc
import os
import random
import tempfile
import tracemalloc
import unittest

import numpy as np
import torch

import accelerate
import PIL
import transformers
from diffusers import (
    AutoencoderKL,
    DDIMPipeline,
    DDIMScheduler,
    DDPMPipeline,
    DDPMScheduler,
    PNDMScheduler,
    StableDiffusionImg2ImgPipeline,
    StableDiffusionInpaintPipelineLegacy,
    StableDiffusionPipeline,
    UNet2DConditionModel,
    UNet2DModel,
    VQModel,
    logging,
)
from diffusers.pipeline_utils import DiffusionPipeline
from diffusers.schedulers.scheduling_utils import SCHEDULER_CONFIG_NAME
from diffusers.utils import CONFIG_NAME, WEIGHTS_NAME, floats_tensor, slow, torch_device
from diffusers.utils.testing_utils import CaptureLogger, get_tests_dir, require_torch_gpu
from packaging import version
from PIL import Image
from transformers import CLIPFeatureExtractor, CLIPModel, CLIPTextConfig, CLIPTextModel, CLIPTokenizer


torch.backends.cuda.matmul.allow_tf32 = False


def test_progress_bar(capsys):
    model = UNet2DModel(
        block_out_channels=(32, 64),
        layers_per_block=2,
        sample_size=32,
        in_channels=3,
        out_channels=3,
        down_block_types=("DownBlock2D", "AttnDownBlock2D"),
        up_block_types=("AttnUpBlock2D", "UpBlock2D"),
    )
    scheduler = DDPMScheduler(num_train_timesteps=10)

    ddpm = DDPMPipeline(model, scheduler).to(torch_device)
    ddpm(output_type="numpy").images
    captured = capsys.readouterr()
    assert "10/10" in captured.err, "Progress bar has to be displayed"

    ddpm.set_progress_bar_config(disable=True)
    ddpm(output_type="numpy").images
    captured = capsys.readouterr()
    assert captured.err == "", "Progress bar should be disabled"


class CustomPipelineTests(unittest.TestCase):
    def test_load_custom_pipeline(self):
        pipeline = DiffusionPipeline.from_pretrained(
            "google/ddpm-cifar10-32", custom_pipeline="hf-internal-testing/diffusers-dummy-pipeline"
        )
        # NOTE that `"CustomPipeline"` is not a class that is defined in this library, but solely on the Hub
        # under https://huggingface.co/hf-internal-testing/diffusers-dummy-pipeline/blob/main/pipeline.py#L24
        assert pipeline.__class__.__name__ == "CustomPipeline"

    def test_run_custom_pipeline(self):
        pipeline = DiffusionPipeline.from_pretrained(
            "google/ddpm-cifar10-32", custom_pipeline="hf-internal-testing/diffusers-dummy-pipeline"
        )
        images, output_str = pipeline(num_inference_steps=2, output_type="np")

        assert images[0].shape == (1, 32, 32, 3)
        # compare output to https://huggingface.co/hf-internal-testing/diffusers-dummy-pipeline/blob/main/pipeline.py#L102
        assert output_str == "This is a test"

    def test_local_custom_pipeline(self):
        local_custom_pipeline_path = get_tests_dir("fixtures/custom_pipeline")
        pipeline = DiffusionPipeline.from_pretrained(
            "google/ddpm-cifar10-32", custom_pipeline=local_custom_pipeline_path
        )
        images, output_str = pipeline(num_inference_steps=2, output_type="np")

        assert pipeline.__class__.__name__ == "CustomLocalPipeline"
        assert images[0].shape == (1, 32, 32, 3)
        # compare to https://github.com/huggingface/diffusers/blob/main/tests/fixtures/custom_pipeline/pipeline.py#L102
        assert output_str == "This is a local test"

    @slow
    @unittest.skipIf(torch_device == "cpu", "Stable diffusion is supposed to run on GPU")
    def test_load_pipeline_from_git(self):
        clip_model_id = "laion/CLIP-ViT-B-32-laion2B-s34B-b79K"

        feature_extractor = CLIPFeatureExtractor.from_pretrained(clip_model_id)
        clip_model = CLIPModel.from_pretrained(clip_model_id, torch_dtype=torch.float16)

        pipeline = DiffusionPipeline.from_pretrained(
            "CompVis/stable-diffusion-v1-4",
            custom_pipeline="clip_guided_stable_diffusion",
            clip_model=clip_model,
            feature_extractor=feature_extractor,
            torch_dtype=torch.float16,
            revision="fp16",
        )
        pipeline.enable_attention_slicing()
        pipeline = pipeline.to(torch_device)

        # NOTE that `"CLIPGuidedStableDiffusion"` is not a class that is defined in the pypi package of th e library, but solely on the community examples folder of GitHub under:
        # https://github.com/huggingface/diffusers/blob/main/examples/community/clip_guided_stable_diffusion.py
        assert pipeline.__class__.__name__ == "CLIPGuidedStableDiffusion"

        image = pipeline("a prompt", num_inference_steps=2, output_type="np").images[0]
        assert image.shape == (512, 512, 3)


class PipelineFastTests(unittest.TestCase):
    @property
    def dummy_image(self):
        batch_size = 1
        num_channels = 3
        sizes = (32, 32)

        image = floats_tensor((batch_size, num_channels) + sizes, rng=random.Random(0)).to(torch_device)
        return image

    @property
    def dummy_uncond_unet(self):
        torch.manual_seed(0)
        model = UNet2DModel(
            block_out_channels=(32, 64),
            layers_per_block=2,
            sample_size=32,
            in_channels=3,
            out_channels=3,
            down_block_types=("DownBlock2D", "AttnDownBlock2D"),
            up_block_types=("AttnUpBlock2D", "UpBlock2D"),
        )
        return model

    @property
    def dummy_cond_unet(self):
        torch.manual_seed(0)
        model = UNet2DConditionModel(
            block_out_channels=(32, 64),
            layers_per_block=2,
            sample_size=32,
            in_channels=4,
            out_channels=4,
            down_block_types=("DownBlock2D", "CrossAttnDownBlock2D"),
            up_block_types=("CrossAttnUpBlock2D", "UpBlock2D"),
            cross_attention_dim=32,
        )
        return model

    @property
    def dummy_cond_unet_inpaint(self):
        torch.manual_seed(0)
        model = UNet2DConditionModel(
            block_out_channels=(32, 64),
            layers_per_block=2,
            sample_size=32,
            in_channels=9,
            out_channels=4,
            down_block_types=("DownBlock2D", "CrossAttnDownBlock2D"),
            up_block_types=("CrossAttnUpBlock2D", "UpBlock2D"),
            cross_attention_dim=32,
        )
        return model

    @property
    def dummy_vq_model(self):
        torch.manual_seed(0)
        model = VQModel(
            block_out_channels=[32, 64],
            in_channels=3,
            out_channels=3,
            down_block_types=["DownEncoderBlock2D", "DownEncoderBlock2D"],
            up_block_types=["UpDecoderBlock2D", "UpDecoderBlock2D"],
            latent_channels=3,
        )
        return model

    @property
    def dummy_vae(self):
        torch.manual_seed(0)
        model = AutoencoderKL(
            block_out_channels=[32, 64],
            in_channels=3,
            out_channels=3,
            down_block_types=["DownEncoderBlock2D", "DownEncoderBlock2D"],
            up_block_types=["UpDecoderBlock2D", "UpDecoderBlock2D"],
            latent_channels=4,
        )
        return model

    @property
    def dummy_text_encoder(self):
        torch.manual_seed(0)
        config = CLIPTextConfig(
            bos_token_id=0,
            eos_token_id=2,
            hidden_size=32,
            intermediate_size=37,
            layer_norm_eps=1e-05,
            num_attention_heads=4,
            num_hidden_layers=5,
            pad_token_id=1,
            vocab_size=1000,
        )
        return CLIPTextModel(config)

    @property
    def dummy_extractor(self):
        def extract(*args, **kwargs):
            class Out:
                def __init__(self):
                    self.pixel_values = torch.ones([0])

                def to(self, device):
                    self.pixel_values.to(device)
                    return self

            return Out()

        return extract

    def test_components(self):
        """Test that components property works correctly"""
        unet = self.dummy_cond_unet
        scheduler = PNDMScheduler(skip_prk_steps=True)
        vae = self.dummy_vae
        bert = self.dummy_text_encoder
        tokenizer = CLIPTokenizer.from_pretrained("hf-internal-testing/tiny-random-clip")

        image = self.dummy_image.cpu().permute(0, 2, 3, 1)[0]
        init_image = Image.fromarray(np.uint8(image)).convert("RGB")
        mask_image = Image.fromarray(np.uint8(image + 4)).convert("RGB").resize((128, 128))

        # make sure here that pndm scheduler skips prk
        inpaint = StableDiffusionInpaintPipelineLegacy(
            unet=unet,
            scheduler=scheduler,
            vae=vae,
            text_encoder=bert,
            tokenizer=tokenizer,
            safety_checker=None,
            feature_extractor=self.dummy_extractor,
        ).to(torch_device)
        img2img = StableDiffusionImg2ImgPipeline(**inpaint.components).to(torch_device)
        text2img = StableDiffusionPipeline(**inpaint.components).to(torch_device)

        prompt = "A painting of a squirrel eating a burger"

        # Device type MPS is not supported for torch.Generator() api.
        if torch_device == "mps":
            generator = torch.manual_seed(0)
        else:
            generator = torch.Generator(device=torch_device).manual_seed(0)

        image_inpaint = inpaint(
            [prompt],
            generator=generator,
            num_inference_steps=2,
            output_type="np",
            init_image=init_image,
            mask_image=mask_image,
        ).images
        image_img2img = img2img(
            [prompt],
            generator=generator,
            num_inference_steps=2,
            output_type="np",
            init_image=init_image,
        ).images
        image_text2img = text2img(
            [prompt],
            generator=generator,
            num_inference_steps=2,
            output_type="np",
        ).images

        assert image_inpaint.shape == (1, 32, 32, 3)
        assert image_img2img.shape == (1, 32, 32, 3)
        assert image_text2img.shape == (1, 128, 128, 3)


@slow
class PipelineSlowTests(unittest.TestCase):
    def tearDown(self):
        # clean up the VRAM after each test
        super().tearDown()
        gc.collect()
        torch.cuda.empty_cache()

    def test_smart_download(self):
        model_id = "hf-internal-testing/unet-pipeline-dummy"
        with tempfile.TemporaryDirectory() as tmpdirname:
            _ = DiffusionPipeline.from_pretrained(model_id, cache_dir=tmpdirname, force_download=True)
            local_repo_name = "--".join(["models"] + model_id.split("/"))
            snapshot_dir = os.path.join(tmpdirname, local_repo_name, "snapshots")
            snapshot_dir = os.path.join(snapshot_dir, os.listdir(snapshot_dir)[0])

            # inspect all downloaded files to make sure that everything is included
            assert os.path.isfile(os.path.join(snapshot_dir, DiffusionPipeline.config_name))
            assert os.path.isfile(os.path.join(snapshot_dir, CONFIG_NAME))
            assert os.path.isfile(os.path.join(snapshot_dir, SCHEDULER_CONFIG_NAME))
            assert os.path.isfile(os.path.join(snapshot_dir, WEIGHTS_NAME))
            assert os.path.isfile(os.path.join(snapshot_dir, "scheduler", SCHEDULER_CONFIG_NAME))
            assert os.path.isfile(os.path.join(snapshot_dir, "unet", WEIGHTS_NAME))
            assert os.path.isfile(os.path.join(snapshot_dir, "unet", WEIGHTS_NAME))
            # let's make sure the super large numpy file:
            # https://huggingface.co/hf-internal-testing/unet-pipeline-dummy/blob/main/big_array.npy
            # is not downloaded, but all the expected ones
            assert not os.path.isfile(os.path.join(snapshot_dir, "big_array.npy"))

    def test_warning_unused_kwargs(self):
        model_id = "hf-internal-testing/unet-pipeline-dummy"
        logger = logging.get_logger("diffusers.pipeline_utils")
        with tempfile.TemporaryDirectory() as tmpdirname:
            with CaptureLogger(logger) as cap_logger:
                DiffusionPipeline.from_pretrained(model_id, not_used=True, cache_dir=tmpdirname, force_download=True)

        assert cap_logger.out == "Keyword arguments {'not_used': True} not recognized.\n"

    def test_from_pretrained_save_pretrained(self):
        # 1. Load models
        model = UNet2DModel(
            block_out_channels=(32, 64),
            layers_per_block=2,
            sample_size=32,
            in_channels=3,
            out_channels=3,
            down_block_types=("DownBlock2D", "AttnDownBlock2D"),
            up_block_types=("AttnUpBlock2D", "UpBlock2D"),
        )
        schedular = DDPMScheduler(num_train_timesteps=10)

        ddpm = DDPMPipeline(model, schedular)
        ddpm.to(torch_device)
        ddpm.set_progress_bar_config(disable=None)

        with tempfile.TemporaryDirectory() as tmpdirname:
            ddpm.save_pretrained(tmpdirname)
            new_ddpm = DDPMPipeline.from_pretrained(tmpdirname)
            new_ddpm.to(torch_device)

        generator = torch.manual_seed(0)
        image = ddpm(generator=generator, output_type="numpy").images

        generator = generator.manual_seed(0)
        new_image = new_ddpm(generator=generator, output_type="numpy").images

        assert np.abs(image - new_image).sum() < 1e-5, "Models don't give the same forward pass"

    def test_from_pretrained_hub(self):
        model_path = "google/ddpm-cifar10-32"

        scheduler = DDPMScheduler(num_train_timesteps=10)

        ddpm = DDPMPipeline.from_pretrained(model_path, scheduler=scheduler)
        ddpm.to(torch_device)
        ddpm.set_progress_bar_config(disable=None)
        ddpm_from_hub = DiffusionPipeline.from_pretrained(model_path, scheduler=scheduler)
        ddpm_from_hub.to(torch_device)
        ddpm_from_hub.set_progress_bar_config(disable=None)

        generator = torch.manual_seed(0)
        image = ddpm(generator=generator, output_type="numpy").images

        generator = generator.manual_seed(0)
        new_image = ddpm_from_hub(generator=generator, output_type="numpy").images

        assert np.abs(image - new_image).sum() < 1e-5, "Models don't give the same forward pass"

    def test_from_pretrained_hub_pass_model(self):
        model_path = "google/ddpm-cifar10-32"

        scheduler = DDPMScheduler(num_train_timesteps=10)

        # pass unet into DiffusionPipeline
        unet = UNet2DModel.from_pretrained(model_path)
        ddpm_from_hub_custom_model = DiffusionPipeline.from_pretrained(model_path, unet=unet, scheduler=scheduler)
        ddpm_from_hub_custom_model.to(torch_device)
        ddpm_from_hub_custom_model.set_progress_bar_config(disable=None)

        ddpm_from_hub = DiffusionPipeline.from_pretrained(model_path, scheduler=scheduler)
        ddpm_from_hub.to(torch_device)
        ddpm_from_hub_custom_model.set_progress_bar_config(disable=None)

        generator = torch.manual_seed(0)
        image = ddpm_from_hub_custom_model(generator=generator, output_type="numpy").images

        generator = generator.manual_seed(0)
        new_image = ddpm_from_hub(generator=generator, output_type="numpy").images

        assert np.abs(image - new_image).sum() < 1e-5, "Models don't give the same forward pass"

    def test_output_format(self):
        model_path = "google/ddpm-cifar10-32"

        pipe = DDIMPipeline.from_pretrained(model_path)
        pipe.to(torch_device)
        pipe.set_progress_bar_config(disable=None)

        generator = torch.manual_seed(0)
        images = pipe(generator=generator, output_type="numpy").images
        assert images.shape == (1, 32, 32, 3)
        assert isinstance(images, np.ndarray)

        images = pipe(generator=generator, output_type="pil").images
        assert isinstance(images, list)
        assert len(images) == 1
        assert isinstance(images[0], PIL.Image.Image)

        # use PIL by default
        images = pipe(generator=generator).images
        assert isinstance(images, list)
        assert isinstance(images[0], PIL.Image.Image)

    def test_ddpm_ddim_equality(self):
        model_id = "google/ddpm-cifar10-32"

        unet = UNet2DModel.from_pretrained(model_id)
        ddpm_scheduler = DDPMScheduler()
        ddim_scheduler = DDIMScheduler()

        ddpm = DDPMPipeline(unet=unet, scheduler=ddpm_scheduler)
        ddpm.to(torch_device)
        ddpm.set_progress_bar_config(disable=None)
        ddim = DDIMPipeline(unet=unet, scheduler=ddim_scheduler)
        ddim.to(torch_device)
        ddim.set_progress_bar_config(disable=None)

        generator = torch.manual_seed(0)
        ddpm_image = ddpm(generator=generator, output_type="numpy").images

        generator = torch.manual_seed(0)
        ddim_image = ddim(generator=generator, num_inference_steps=1000, eta=1.0, output_type="numpy").images

        # the values aren't exactly equal, but the images look the same visually
        assert np.abs(ddpm_image - ddim_image).max() < 1e-1

    @unittest.skip("(Anton) The test is failing for large batch sizes, needs investigation")
    def test_ddpm_ddim_equality_batched(self):
        model_id = "google/ddpm-cifar10-32"

        unet = UNet2DModel.from_pretrained(model_id)
        ddpm_scheduler = DDPMScheduler()
        ddim_scheduler = DDIMScheduler()

        ddpm = DDPMPipeline(unet=unet, scheduler=ddpm_scheduler)
        ddpm.to(torch_device)
        ddpm.set_progress_bar_config(disable=None)

        ddim = DDIMPipeline(unet=unet, scheduler=ddim_scheduler)
        ddim.to(torch_device)
        ddim.set_progress_bar_config(disable=None)

        generator = torch.manual_seed(0)
        ddpm_images = ddpm(batch_size=4, generator=generator, output_type="numpy").images

        generator = torch.manual_seed(0)
        ddim_images = ddim(
            batch_size=4, generator=generator, num_inference_steps=1000, eta=1.0, output_type="numpy"
        ).images

        # the values aren't exactly equal, but the images look the same visually
        assert np.abs(ddpm_images - ddim_images).max() < 1e-1

    @require_torch_gpu
    def test_stable_diffusion_accelerate_load_works(self):
        if version.parse(version.parse(transformers.__version__).base_version) < version.parse("4.23"):
            return

        if version.parse(version.parse(accelerate.__version__).base_version) < version.parse("0.14"):
            return

        model_id = "CompVis/stable-diffusion-v1-4"
        _ = StableDiffusionPipeline.from_pretrained(
            model_id, revision="fp16", torch_dtype=torch.float16, use_auth_token=True, device_map="auto"
        ).to(torch_device)

    @require_torch_gpu
    def test_stable_diffusion_accelerate_load_reduces_memory_footprint(self):
        if version.parse(version.parse(transformers.__version__).base_version) < version.parse("4.23"):
            return

        if version.parse(version.parse(accelerate.__version__).base_version) < version.parse("0.14"):
            return

        pipeline_id = "CompVis/stable-diffusion-v1-4"

        torch.cuda.empty_cache()
        gc.collect()

        tracemalloc.start()
        pipeline_normal_load = StableDiffusionPipeline.from_pretrained(
            pipeline_id, revision="fp16", torch_dtype=torch.float16, use_auth_token=True
        )
        pipeline_normal_load.to(torch_device)
        _, peak_normal = tracemalloc.get_traced_memory()
        tracemalloc.stop()

        del pipeline_normal_load
        torch.cuda.empty_cache()
        gc.collect()

        tracemalloc.start()
        _ = StableDiffusionPipeline.from_pretrained(
            pipeline_id, revision="fp16", torch_dtype=torch.float16, use_auth_token=True, device_map="auto"
        )
        _, peak_accelerate = tracemalloc.get_traced_memory()

        tracemalloc.stop()

        assert peak_accelerate < peak_normal

    @slow
    @unittest.skipIf(torch_device == "cpu", "This test is supposed to run on GPU")
    def test_stable_diffusion_pipeline_with_unet_on_gpu_only(self):
        torch.cuda.empty_cache()
        torch.cuda.reset_max_memory_allocated()

        pipeline_id = "CompVis/stable-diffusion-v1-4"
        prompt = "Andromeda galaxy in a bottle"

        pipeline = StableDiffusionPipeline.from_pretrained(
            pipeline_id, revision="fp16", torch_dtype=torch.float32, use_auth_token=True
        )
        pipeline.cuda_with_minimal_gpu_usage()

        _ = pipeline(prompt)

        mem_bytes = torch.cuda.max_memory_allocated()
        # make sure that less than 0.8 GB is allocated
        assert mem_bytes < 0.8 * 10**9