# coding=utf-8
# Copyright 2025 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 random
import tempfile
import unittest

import numpy as np
import torch
from PIL import Image
from transformers import CLIPTextConfig, CLIPTextModel, CLIPTokenizer

from diffusers import (
    AutoencoderKL,
    DDIMInverseScheduler,
    DDIMScheduler,
    DPMSolverMultistepInverseScheduler,
    DPMSolverMultistepScheduler,
    StableDiffusionDiffEditPipeline,
    UNet2DConditionModel,
)
from diffusers.utils.testing_utils import (
    backend_empty_cache,
    enable_full_determinism,
    floats_tensor,
    load_image,
    nightly,
    numpy_cosine_similarity_distance,
    require_torch_accelerator,
    torch_device,
)

from ..pipeline_params import TEXT_GUIDED_IMAGE_INPAINTING_BATCH_PARAMS, TEXT_GUIDED_IMAGE_INPAINTING_PARAMS
from ..test_pipelines_common import PipelineFromPipeTesterMixin, PipelineLatentTesterMixin, PipelineTesterMixin


enable_full_determinism()


class StableDiffusionDiffEditPipelineFastTests(
    PipelineLatentTesterMixin, PipelineTesterMixin, PipelineFromPipeTesterMixin, unittest.TestCase
):
    pipeline_class = StableDiffusionDiffEditPipeline
    params = TEXT_GUIDED_IMAGE_INPAINTING_PARAMS - {"height", "width", "image"} | {"image_latents"}
    batch_params = TEXT_GUIDED_IMAGE_INPAINTING_BATCH_PARAMS - {"image"} | {"image_latents"}
    image_params = frozenset(
        []
    )  # TO-DO: update image_params once pipeline is refactored with VaeImageProcessor.preprocess
    image_latents_params = frozenset([])

    def get_dummy_components(self):
        torch.manual_seed(0)
        unet = 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,
            # SD2-specific config below
            attention_head_dim=(2, 4),
            use_linear_projection=True,
        )
        scheduler = DDIMScheduler(
            beta_start=0.00085,
            beta_end=0.012,
            beta_schedule="scaled_linear",
            clip_sample=False,
            set_alpha_to_one=False,
        )
        inverse_scheduler = DDIMInverseScheduler(
            beta_start=0.00085,
            beta_end=0.012,
            beta_schedule="scaled_linear",
            clip_sample=False,
            set_alpha_to_zero=False,
        )
        torch.manual_seed(0)
        vae = 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,
            sample_size=128,
        )
        torch.manual_seed(0)
        text_encoder_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,
            # SD2-specific config below
            hidden_act="gelu",
            projection_dim=512,
        )
        text_encoder = CLIPTextModel(text_encoder_config)
        tokenizer = CLIPTokenizer.from_pretrained("hf-internal-testing/tiny-random-clip")

        components = {
            "unet": unet,
            "scheduler": scheduler,
            "inverse_scheduler": inverse_scheduler,
            "vae": vae,
            "text_encoder": text_encoder,
            "tokenizer": tokenizer,
            "safety_checker": None,
            "feature_extractor": None,
        }

        return components

    def get_dummy_inputs(self, device, seed=0):
        mask = floats_tensor((1, 16, 16), rng=random.Random(seed)).to(device)
        latents = floats_tensor((1, 2, 4, 16, 16), rng=random.Random(seed)).to(device)
        if str(device).startswith("mps"):
            generator = torch.manual_seed(seed)
        else:
            generator = torch.Generator(device=device).manual_seed(seed)
        inputs = {
            "prompt": "a dog and a newt",
            "mask_image": mask,
            "image_latents": latents,
            "generator": generator,
            "num_inference_steps": 2,
            "inpaint_strength": 1.0,
            "guidance_scale": 6.0,
            "output_type": "np",
        }

        return inputs

    def get_dummy_mask_inputs(self, device, seed=0):
        image = floats_tensor((1, 3, 32, 32), rng=random.Random(seed)).to(device)
        image = image.cpu().permute(0, 2, 3, 1)[0]
        image = Image.fromarray(np.uint8(image)).convert("RGB")
        if str(device).startswith("mps"):
            generator = torch.manual_seed(seed)
        else:
            generator = torch.Generator(device=device).manual_seed(seed)
        inputs = {
            "image": image,
            "source_prompt": "a cat and a frog",
            "target_prompt": "a dog and a newt",
            "generator": generator,
            "num_inference_steps": 2,
            "num_maps_per_mask": 2,
            "mask_encode_strength": 1.0,
            "guidance_scale": 6.0,
            "output_type": "np",
        }

        return inputs

    def get_dummy_inversion_inputs(self, device, seed=0):
        image = floats_tensor((1, 3, 32, 32), rng=random.Random(seed)).to(device)
        image = image.cpu().permute(0, 2, 3, 1)[0]
        image = Image.fromarray(np.uint8(image)).convert("RGB")
        if str(device).startswith("mps"):
            generator = torch.manual_seed(seed)
        else:
            generator = torch.Generator(device=device).manual_seed(seed)
        inputs = {
            "image": image,
            "prompt": "a cat and a frog",
            "generator": generator,
            "num_inference_steps": 2,
            "inpaint_strength": 1.0,
            "guidance_scale": 6.0,
            "decode_latents": True,
            "output_type": "np",
        }
        return inputs

    def test_save_load_optional_components(self):
        if not hasattr(self.pipeline_class, "_optional_components"):
            return

        components = self.get_dummy_components()
        pipe = self.pipeline_class(**components)
        pipe.to(torch_device)
        pipe.set_progress_bar_config(disable=None)

        # set all optional components to None and update pipeline config accordingly
        for optional_component in pipe._optional_components:
            setattr(pipe, optional_component, None)
        pipe.register_modules(**dict.fromkeys(pipe._optional_components))

        inputs = self.get_dummy_inputs(torch_device)
        output = pipe(**inputs)[0]

        with tempfile.TemporaryDirectory() as tmpdir:
            pipe.save_pretrained(tmpdir)
            pipe_loaded = self.pipeline_class.from_pretrained(tmpdir)
            pipe_loaded.to(torch_device)
            pipe_loaded.set_progress_bar_config(disable=None)

        for optional_component in pipe._optional_components:
            self.assertTrue(
                getattr(pipe_loaded, optional_component) is None,
                f"`{optional_component}` did not stay set to None after loading.",
            )

        inputs = self.get_dummy_inputs(torch_device)
        output_loaded = pipe_loaded(**inputs)[0]

        max_diff = np.abs(output - output_loaded).max()
        self.assertLess(max_diff, 1e-4)

    def test_mask(self):
        device = "cpu"

        components = self.get_dummy_components()
        pipe = self.pipeline_class(**components)
        pipe.to(device)
        pipe.set_progress_bar_config(disable=None)

        inputs = self.get_dummy_mask_inputs(device)
        mask = pipe.generate_mask(**inputs)
        mask_slice = mask[0, -3:, -3:]

        self.assertEqual(mask.shape, (1, 16, 16))
        expected_slice = np.array([0] * 9)
        max_diff = np.abs(mask_slice.flatten() - expected_slice).max()
        self.assertLessEqual(max_diff, 1e-3)
        self.assertEqual(mask[0, -3, -4], 0)

    def test_inversion(self):
        device = "cpu"

        components = self.get_dummy_components()
        pipe = self.pipeline_class(**components)
        pipe.to(device)
        pipe.set_progress_bar_config(disable=None)

        inputs = self.get_dummy_inversion_inputs(device)
        image = pipe.invert(**inputs).images
        image_slice = image[0, -1, -3:, -3:]

        self.assertEqual(image.shape, (2, 32, 32, 3))
        expected_slice = np.array(
            [0.5160, 0.5115, 0.5060, 0.5456, 0.4704, 0.5060, 0.5019, 0.4405, 0.4726],
        )
        max_diff = np.abs(image_slice.flatten() - expected_slice).max()
        self.assertLessEqual(max_diff, 1e-3)

    def test_inference_batch_single_identical(self):
        super().test_inference_batch_single_identical(expected_max_diff=5e-3)

    def test_inversion_dpm(self):
        device = "cpu"

        components = self.get_dummy_components()

        scheduler_args = {"beta_start": 0.00085, "beta_end": 0.012, "beta_schedule": "scaled_linear"}
        components["scheduler"] = DPMSolverMultistepScheduler(**scheduler_args)
        components["inverse_scheduler"] = DPMSolverMultistepInverseScheduler(**scheduler_args)

        pipe = self.pipeline_class(**components)
        pipe.to(device)
        pipe.set_progress_bar_config(disable=None)

        inputs = self.get_dummy_inversion_inputs(device)
        image = pipe.invert(**inputs).images
        image_slice = image[0, -1, -3:, -3:]

        self.assertEqual(image.shape, (2, 32, 32, 3))
        expected_slice = np.array(
            [0.5305, 0.4673, 0.5314, 0.5308, 0.4886, 0.5279, 0.5142, 0.4724, 0.4892],
        )
        max_diff = np.abs(image_slice.flatten() - expected_slice).max()
        self.assertLessEqual(max_diff, 1e-3)

    def test_encode_prompt_works_in_isolation(self):
        extra_required_param_value_dict = {
            "device": torch.device(torch_device).type,
            "do_classifier_free_guidance": self.get_dummy_inputs(device=torch_device).get("guidance_scale", 1.0) > 1.0,
        }
        return super().test_encode_prompt_works_in_isolation(extra_required_param_value_dict)


@require_torch_accelerator
@nightly
class StableDiffusionDiffEditPipelineIntegrationTests(unittest.TestCase):
    def setUp(self):
        super().setUp()
        gc.collect()
        backend_empty_cache(torch_device)

    def tearDown(self):
        super().tearDown()
        gc.collect()
        backend_empty_cache(torch_device)

    @classmethod
    def setUpClass(cls):
        raw_image = load_image(
            "https://huggingface.co/datasets/hf-internal-testing/diffusers-images/resolve/main/diffedit/fruit.png"
        )
        raw_image = raw_image.convert("RGB").resize((256, 256))

        cls.raw_image = raw_image

    def test_stable_diffusion_diffedit_full(self):
        generator = torch.manual_seed(0)

        pipe = StableDiffusionDiffEditPipeline.from_pretrained(
            "stabilityai/stable-diffusion-2-1-base", safety_checker=None, torch_dtype=torch.float16
        )
        pipe.scheduler = DDIMScheduler.from_config(pipe.scheduler.config)
        pipe.scheduler.clip_sample = True

        pipe.inverse_scheduler = DDIMInverseScheduler.from_config(pipe.scheduler.config)
        pipe.enable_model_cpu_offload(device=torch_device)
        pipe.set_progress_bar_config(disable=None)

        source_prompt = "a bowl of fruit"
        target_prompt = "a bowl of pears"

        mask_image = pipe.generate_mask(
            image=self.raw_image,
            source_prompt=source_prompt,
            target_prompt=target_prompt,
            generator=generator,
        )

        inv_latents = pipe.invert(
            prompt=source_prompt,
            image=self.raw_image,
            inpaint_strength=0.7,
            generator=generator,
            num_inference_steps=5,
        ).latents

        image = pipe(
            prompt=target_prompt,
            mask_image=mask_image,
            image_latents=inv_latents,
            generator=generator,
            negative_prompt=source_prompt,
            inpaint_strength=0.7,
            num_inference_steps=5,
            output_type="np",
        ).images[0]

        expected_image = (
            np.array(
                load_image(
                    "https://huggingface.co/datasets/hf-internal-testing/diffusers-images/resolve/main"
                    "/diffedit/pears.png"
                ).resize((256, 256))
            )
            / 255
        )

        assert numpy_cosine_similarity_distance(expected_image.flatten(), image.flatten()) < 2e-1


@nightly
@require_torch_accelerator
class StableDiffusionDiffEditPipelineNightlyTests(unittest.TestCase):
    def setUp(self):
        super().setUp()
        gc.collect()
        backend_empty_cache(torch_device)

    def tearDown(self):
        super().tearDown()
        gc.collect()
        backend_empty_cache(torch_device)

    @classmethod
    def setUpClass(cls):
        raw_image = load_image(
            "https://huggingface.co/datasets/hf-internal-testing/diffusers-images/resolve/main/diffedit/fruit.png"
        )

        raw_image = raw_image.convert("RGB").resize((768, 768))

        cls.raw_image = raw_image

    def test_stable_diffusion_diffedit_dpm(self):
        generator = torch.manual_seed(0)

        pipe = StableDiffusionDiffEditPipeline.from_pretrained(
            "stabilityai/stable-diffusion-2-1", safety_checker=None, torch_dtype=torch.float16
        )
        pipe.scheduler = DPMSolverMultistepScheduler.from_config(pipe.scheduler.config)
        pipe.inverse_scheduler = DPMSolverMultistepInverseScheduler.from_config(pipe.scheduler.config)
        pipe.enable_model_cpu_offload()
        pipe.set_progress_bar_config(disable=None)

        source_prompt = "a bowl of fruit"
        target_prompt = "a bowl of pears"

        mask_image = pipe.generate_mask(
            image=self.raw_image,
            source_prompt=source_prompt,
            target_prompt=target_prompt,
            generator=generator,
        )

        inv_latents = pipe.invert(
            prompt=source_prompt,
            image=self.raw_image,
            inpaint_strength=0.7,
            generator=generator,
            num_inference_steps=25,
        ).latents

        image = pipe(
            prompt=target_prompt,
            mask_image=mask_image,
            image_latents=inv_latents,
            generator=generator,
            negative_prompt=source_prompt,
            inpaint_strength=0.7,
            num_inference_steps=25,
            output_type="np",
        ).images[0]

        expected_image = (
            np.array(
                load_image(
                    "https://huggingface.co/datasets/hf-internal-testing/diffusers-images/resolve/main"
                    "/diffedit/pears.png"
                ).resize((768, 768))
            )
            / 255
        )
        assert np.abs((expected_image - image).max()) < 5e-1
