# Copyright 2024 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 sys
import unittest

import numpy as np
import pytest
import torch
from transformers import AutoTokenizer, T5EncoderModel

from diffusers import AutoencoderKLMochi, FlowMatchEulerDiscreteScheduler, MochiPipeline, MochiTransformer3DModel
from diffusers.utils.testing_utils import (
    floats_tensor,
    is_peft_available,
    is_torch_version,
    require_peft_backend,
    skip_mps,
    torch_device,
)


if is_peft_available():
    pass

sys.path.append(".")

from utils import PeftLoraLoaderMixinTests, check_if_lora_correctly_set  # noqa: E402


@require_peft_backend
@skip_mps
class MochiLoRATests(unittest.TestCase, PeftLoraLoaderMixinTests):
    pipeline_class = MochiPipeline
    scheduler_cls = FlowMatchEulerDiscreteScheduler
    scheduler_classes = [FlowMatchEulerDiscreteScheduler]
    scheduler_kwargs = {}

    transformer_kwargs = {
        "patch_size": 2,
        "num_attention_heads": 2,
        "attention_head_dim": 8,
        "num_layers": 2,
        "pooled_projection_dim": 16,
        "in_channels": 12,
        "out_channels": None,
        "qk_norm": "rms_norm",
        "text_embed_dim": 32,
        "time_embed_dim": 4,
        "activation_fn": "swiglu",
        "max_sequence_length": 16,
    }
    transformer_cls = MochiTransformer3DModel
    vae_kwargs = {
        "latent_channels": 12,
        "out_channels": 3,
        "encoder_block_out_channels": (32, 32, 32, 32),
        "decoder_block_out_channels": (32, 32, 32, 32),
        "layers_per_block": (1, 1, 1, 1, 1),
    }
    vae_cls = AutoencoderKLMochi
    tokenizer_cls, tokenizer_id = AutoTokenizer, "hf-internal-testing/tiny-random-t5"
    text_encoder_cls, text_encoder_id = T5EncoderModel, "hf-internal-testing/tiny-random-t5"

    text_encoder_target_modules = ["q", "k", "v", "o"]

    @property
    def output_shape(self):
        return (1, 7, 16, 16, 3)

    def get_dummy_inputs(self, with_generator=True):
        batch_size = 1
        sequence_length = 16
        num_channels = 4
        num_frames = 7
        num_latent_frames = 3
        sizes = (2, 2)

        generator = torch.manual_seed(0)
        noise = floats_tensor((batch_size, num_latent_frames, num_channels) + sizes)
        input_ids = torch.randint(1, sequence_length, size=(batch_size, sequence_length), generator=generator)

        pipeline_inputs = {
            "prompt": "dance monkey",
            "num_frames": num_frames,
            "num_inference_steps": 4,
            "guidance_scale": 6.0,
            # Cannot reduce because convolution kernel becomes bigger than sample
            "height": 16,
            "width": 16,
            "max_sequence_length": sequence_length,
            "output_type": "np",
        }
        if with_generator:
            pipeline_inputs.update({"generator": generator})

        return noise, input_ids, pipeline_inputs

    @pytest.mark.xfail(
        condition=torch.device(torch_device).type == "cpu" and is_torch_version(">=", "2.5"),
        reason="Test currently fails on CPU and PyTorch 2.5.1 but not on PyTorch 2.4.1.",
        strict=True,
    )
    def test_lora_fuse_nan(self):
        for scheduler_cls in self.scheduler_classes:
            components, text_lora_config, denoiser_lora_config = self.get_dummy_components(scheduler_cls)
            pipe = self.pipeline_class(**components)
            pipe = pipe.to(torch_device)
            pipe.set_progress_bar_config(disable=None)
            _, _, inputs = self.get_dummy_inputs(with_generator=False)

            pipe.transformer.add_adapter(denoiser_lora_config, "adapter-1")

            self.assertTrue(check_if_lora_correctly_set(pipe.transformer), "Lora not correctly set in denoiser")

            # corrupt one LoRA weight with `inf` values
            with torch.no_grad():
                pipe.transformer.transformer_blocks[0].attn1.to_q.lora_A["adapter-1"].weight += float("inf")

            # with `safe_fusing=True` we should see an Error
            with self.assertRaises(ValueError):
                pipe.fuse_lora(components=self.pipeline_class._lora_loadable_modules, safe_fusing=True)

            # without we should not see an error, but every image will be black
            pipe.fuse_lora(components=self.pipeline_class._lora_loadable_modules, safe_fusing=False)

            out = pipe(
                "test", num_inference_steps=2, max_sequence_length=inputs["max_sequence_length"], output_type="np"
            )[0]

            self.assertTrue(np.isnan(out).all())

    def test_simple_inference_with_text_lora_denoiser_fused_multi(self):
        super().test_simple_inference_with_text_lora_denoiser_fused_multi(expected_atol=9e-3)

    def test_simple_inference_with_text_denoiser_lora_unfused(self):
        super().test_simple_inference_with_text_denoiser_lora_unfused(expected_atol=9e-3)

    @unittest.skip("Not supported in Mochi.")
    def test_simple_inference_with_text_denoiser_block_scale(self):
        pass

    @unittest.skip("Not supported in Mochi.")
    def test_simple_inference_with_text_denoiser_block_scale_for_all_dict_options(self):
        pass

    @unittest.skip("Not supported in Mochi.")
    def test_modify_padding_mode(self):
        pass

    @unittest.skip("Text encoder LoRA is not supported in Mochi.")
    def test_simple_inference_with_partial_text_lora(self):
        pass

    @unittest.skip("Text encoder LoRA is not supported in Mochi.")
    def test_simple_inference_with_text_lora(self):
        pass

    @unittest.skip("Text encoder LoRA is not supported in Mochi.")
    def test_simple_inference_with_text_lora_and_scale(self):
        pass

    @unittest.skip("Text encoder LoRA is not supported in Mochi.")
    def test_simple_inference_with_text_lora_fused(self):
        pass

    @unittest.skip("Text encoder LoRA is not supported in Mochi.")
    def test_simple_inference_with_text_lora_save_load(self):
        pass