# coding=utf-8
# Copyright 2025 the HuggingFace Inc. team. All rights reserved.
# Written by Orr Zohar
#
# 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.
from typing import List, Optional, Tuple, Union

import torch
import torch.utils.checkpoint
from torch import nn

from ...cache_utils import DynamicCache
from ...utils import (
    logging,
)
from ..idefics3.configuration_idefics3 import Idefics3Config, Idefics3VisionConfig
from ..idefics3.image_processing_idefics3 import Idefics3ImageProcessor
from ..idefics3.modeling_idefics3 import (
    Idefics3BaseModelOutputWithPast,
    Idefics3ForConditionalGeneration,
    Idefics3Model,
    Idefics3PreTrainedModel,
    Idefics3VisionTransformer,
)


logger = logging.get_logger(__name__)


class SmolVLMVisionConfig(Idefics3VisionConfig):
    r"""
    This is the configuration class to store the configuration of a [`SmolVLMVisionModel`]. It is used to instantiate a
    SmolVLM vision encoder according to the specified arguments, defining the model architecture. Instantiating a
    configuration with the defaults will yield a similar configuration to that of the SigLIP checkpoint
    [google/siglip-so400m-patch14-384](https://huggingface.co/google/siglip-so400m-patch14-384) used in SmolVLM
    [HuggingFaceTB/SmolVLM2-2.2B-Instruct](https://huggingface.co/HuggingFaceTB/SmolVLM2-2.2B-Instruct).

    Configuration objects inherit from [`PretrainedConfig`] and can be used to control the model outputs. Read the
    documentation from [`PretrainedConfig`] for more information.

    Args:
        hidden_size (`int`, *optional*, defaults to 1152):
            Dimensionality of the encoder layers and the pooler layer.
        intermediate_size (`int`, *optional*, defaults to 3072):
            Dimensionality of the "intermediate" (i.e., feed-forward) layer in the Transformer encoder.
        num_hidden_layers (`int`, *optional*, defaults to 12):
            Number of hidden layers in the Transformer encoder.
        num_attention_heads (`int`, *optional*, defaults to 16):
            Number of attention heads for each attention layer in the Transformer encoder.
        num_channels (`int`, *optional*, defaults to 3):
            Number of channels in the input images.
        image_size (`int`, *optional*, defaults to 224):
            The size (resolution) of each image.
        patch_size (`int`, *optional*, defaults to 32):
            The size (resolution) of each patch.
        hidden_act (`str` or `function`, *optional*, defaults to `"gelu_pytorch_tanh"`):
            The non-linear activation function (function or string) in the encoder and pooler. If string, `"gelu"`,
            `"relu"`, `"selu"` and `"gelu_new"` `"quick_gelu"` are supported.
        layer_norm_eps (`float`, *optional*, defaults to 1e-06):
            The epsilon used by the layer normalization layers.
        attention_dropout (`float`, *optional*, defaults to 0.0):
            The dropout ratio for the attention probabilities.
        initializer_range (`float`, *optional*, defaults to 0.02):
            The standard deviation of the truncated_normal_initializer for initializing all weight matrices.

    Example:

    ```python
    >>> from transformers.models.smolvlm.modeling_smolvlm import SmolVLMVisionTransformer
    >>> from transformers.models.smolvlm.configuration_smolvlm import SmolVLMVisionConfig

    >>> # Initializing a SmolVLMVisionConfig with google/siglip-so400m-patch14-384 style configuration
    >>> configuration = SmolVLMVisionConfig()

    >>> # Initializing a SmolVLMVisionTransformer (with random weights) from the google/siglip-so400m-patch14-384 style configuration
    >>> model = SmolVLMVisionTransformer(configuration)

    >>> # Accessing the model configuration
    >>> configuration = model.config
    ```"""

    model_type = "smolvlm_vision"
    pass


class SmolVLMPreTrainedModel(Idefics3PreTrainedModel):
    pass


class SmolVLMVisionTransformer(Idefics3VisionTransformer):
    pass


class SmolVLMConfig(Idefics3Config):
    r"""
    This is the configuration class to store the configuration of a [`SmolVLMModel`]. It is used to instantiate a
    SmolVLM model according to the specified arguments, defining the model architecture. Instantiating a
    configuration with the defaults will yield a similar configuration to that of the model of the SmolVLM
    [HuggingFaceTB/SmolVLM2-2.2B-Instruct](https://huggingface.co/HuggingFaceTB/SmolVLM2-2.2B-Instruct) architecture.

    Configuration objects inherit from [`PretrainedConfig`] and can be used to control the model outputs. Read the
    documentation from [`PretrainedConfig`] for more information.

    Args:
        use_cache (`bool`, *optional*, defaults to `True`):
            Whether or not the model should cache the key/value pairs of the attention mechanism. Only
            relevant if `config.is_decoder=True`.
        image_token_id (`int`, *optional*, defaults to 128257):
            The id of the "image" token.
        tie_word_embeddings (`bool`, *optional*, defaults to `False`):
            Whether or not to tie the word embeddings with the token embeddings.
        vision_config (`IdeficsVisionConfig` or `dict`, *optional*, defaults to `IdeficsVisionConfig`):
            Custom vision config or dict for the vision tower
        text_config (`PretrainedConfig` or `dict`, *optional*, defaults to `LlamaConfig`):
            Custom text config or dict for the text model
        scale_factor (`int`, *optional*, defaults to 2):
            The scale factor for the image encoder.
        pad_token_id (`int`, *optional*, defaults to 128002):
            The id of the padding token.

    Example:
    ```python
    >>> from transformers import SmolVLMModel, SmolVLMConfig
    >>> # Initializing configuration
    >>> configuration = SmolVLMConfig()
    >>> # Initializing a model from the configuration
    >>> model = SmolVLMModel(configuration)
    >>> # Accessing the model configuration
    >>> configuration = model.config
    ```"""

    model_type = "smolvlm"
    pass


class SmolVLMImageProcessor(Idefics3ImageProcessor):
    pass


class SmolVLMBaseModelOutputWithPast(Idefics3BaseModelOutputWithPast):
    pass


class SmolVLMModel(Idefics3Model):
    """
    A subclass of Idefics3Model. We do *not* remove or block the call to inputs_merger
    in forward. Instead, we override inputs_merger here with custom logic.
    """

    def inputs_merger(
        self, input_ids: torch.LongTensor, inputs_embeds: torch.Tensor, image_hidden_states: torch.Tensor
    ):
        _, patch_size, _ = image_hidden_states.shape

        image_mask = input_ids == self.image_token_id
        num_image_tokens = image_mask.sum(dim=1)
        if not torch.all(num_image_tokens % patch_size == 0):
            raise ValueError("At least one sample has <image> tokens not divisible by patch_size.")

        blocks_per_sample = num_image_tokens // patch_size

        offsets = torch.nn.functional.pad(blocks_per_sample.cumsum(dim=0), (1, 0), value=0)
        block_offset = offsets[:-1]
        row_cum = image_mask.cumsum(dim=-1)
        chunk_idx = (row_cum - 1) // patch_size
        local_idx = (row_cum - 1) % patch_size
        block_idx = block_offset.unsqueeze(1) + chunk_idx

        image_embeds = torch.zeros_like(inputs_embeds)
        image_embeds[image_mask] = image_hidden_states[block_idx[image_mask], local_idx[image_mask], :]

        merged_embeds = torch.where(image_mask.unsqueeze(-1), image_embeds, inputs_embeds)
        return merged_embeds

    def forward(
        self,
        input_ids: torch.LongTensor = None,
        attention_mask: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.LongTensor] = None,
        past_key_values: Optional[List[torch.FloatTensor]] = None,
        inputs_embeds: Optional[torch.FloatTensor] = None,
        pixel_values: Optional[torch.FloatTensor] = None,
        pixel_attention_mask: Optional[torch.BoolTensor] = None,
        image_hidden_states: Optional[torch.FloatTensor] = None,
        use_cache: Optional[bool] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        return_dict: Optional[bool] = None,
        cache_position: Optional[torch.LongTensor] = None,
    ) -> Union[Tuple, SmolVLMBaseModelOutputWithPast]:
        output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
        output_hidden_states = (
            output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
        )
        use_cache = use_cache if use_cache is not None else self.config.use_cache
        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        if self.training and self.text_model.gradient_checkpointing and use_cache:
            logger.warning_once(
                "`use_cache=True` is incompatible with gradient checkpointing. Setting `use_cache=False`..."
            )
            use_cache = False

        # retrieve input_ids and inputs_embeds
        if input_ids is not None:
            batch_size, seq_length = input_ids.shape
        elif inputs_embeds is not None:
            batch_size, seq_length, _ = inputs_embeds.shape
        else:
            raise ValueError("You have to specify either input_ids or inputs_embeds")

        past_seen_tokens = 0
        if use_cache:
            if past_key_values is None:
                past_key_values = DynamicCache()
            past_seen_tokens = past_key_values.get_seq_length()

        if inputs_embeds is not None and input_ids is None and past_seen_tokens == 0:
            raise ValueError("When first calling the model, if input_embeds are passed, input_ids should not be None.")

        if inputs_embeds is None:
            inputs_embeds = self.text_model.get_input_embeddings()(input_ids).to(input_ids.device)

        # START VISUAL INPUTS INTEGRATION
        if pixel_values is not None and image_hidden_states is not None:
            raise ValueError("You cannot specify both pixel_values and image_hidden_states at the same time")
        elif pixel_values is not None:
            batch_size, num_images, num_channels, height, width = pixel_values.shape
            pixel_values = pixel_values
            pixel_values = pixel_values.view(batch_size * num_images, *pixel_values.shape[2:])

            # Remove padding images - padding images are full 0.
            nb_values_per_image = pixel_values.shape[1:].numel()
            real_images_inds = (pixel_values == 0.0).sum(dim=(-1, -2, -3)) != nb_values_per_image

            if not any(real_images_inds):
                # no images, leave one empty image.
                real_images_inds[0] = True

            pixel_values = pixel_values[real_images_inds].contiguous()

            # Handle the vision attention mask
            if pixel_attention_mask is None:
                pixel_attention_mask = torch.ones(
                    size=[pixel_values.shape[i] for i in (0, 2, 3)],
                    dtype=torch.bool,
                    device=pixel_values.device,
                )
            else:
                # Remove padding images from the mask
                pixel_attention_mask = pixel_attention_mask.view(
                    batch_size * num_images, *pixel_attention_mask.shape[2:]
                )
                pixel_attention_mask = pixel_attention_mask[real_images_inds].contiguous()

            patch_size = self.config.vision_config.patch_size
            patches_subgrid = pixel_attention_mask.unfold(dimension=1, size=patch_size, step=patch_size)
            patches_subgrid = patches_subgrid.unfold(dimension=2, size=patch_size, step=patch_size)
            patch_attention_mask = (patches_subgrid.sum(dim=(-1, -2)) > 0).bool()

            # Get sequence from the vision encoder
            image_hidden_states = self.vision_model(
                pixel_values=pixel_values,
                patch_attention_mask=patch_attention_mask,
            ).last_hidden_state

            # Modality projection & resampling
            image_hidden_states = self.connector(image_hidden_states)

        elif image_hidden_states is not None:
            image_hidden_states = image_hidden_states.to(dtype=self.dtype, device=input_ids.device)

        if inputs_embeds is not None and image_hidden_states is not None:
            # When we generate, we don't want to replace the potential image_token_id that we generated by images
            # that simply don't exist
            inputs_embeds = self.inputs_merger(
                input_ids=input_ids,
                inputs_embeds=inputs_embeds,
                image_hidden_states=image_hidden_states,
            )

        outputs = self.text_model(
            inputs_embeds=inputs_embeds,
            attention_mask=attention_mask,
            position_ids=position_ids,
            past_key_values=past_key_values,
            use_cache=use_cache,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
            cache_position=cache_position,
        )

        if not return_dict:
            return tuple(v for v in [*outputs, image_hidden_states] if v is not None)

        return SmolVLMBaseModelOutputWithPast(
            last_hidden_state=outputs.last_hidden_state,
            past_key_values=outputs.past_key_values,
            hidden_states=outputs.hidden_states,
            attentions=outputs.attentions,
            image_hidden_states=image_hidden_states,
        )


class SmolVLMForConditionalGeneration(Idefics3ForConditionalGeneration):
    """
    A subclass of Idefics3ForConditionalGeneration that uses SmolVLMModel
    instead of the default Idefics3Model.
    """

    def __init__(self, config):
        super().__init__(config)
        self.model = SmolVLMModel(config)
        self.lm_head = nn.Linear(config.text_config.hidden_size, config.text_config.vocab_size, bias=False)
        self.post_init()

    def forward(self, **super_kwargs):
        r"""
        Args:
            labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
                Labels for computing the masked language modeling loss. Indices should either be in `[0, ...,
                config.vocab_size]` or `model.image_token_id` (where `model` is your instance of `SmolVLMForConditionalGeneration`).
                Tokens with indices set to `model.image_token_id` are ignored (masked), the loss is only
                computed for the tokens with labels in `[0, ..., config.vocab_size]`.
        Returns:

        Example:

        ```python
        >>> import requests
        >>> import torch
        >>> from PIL import Image
        >>> from io import BytesIO

        >>> from transformers import AutoProcessor, AutoModelForImageTextToText
        >>> from transformers.image_utils import load_image

        >>> # Note that passing the image urls (instead of the actual pil images) to the processor is also possible
        >>> image1 = load_image("https://cdn.britannica.com/61/93061-050-99147DCE/Statue-of-Liberty-Island-New-York-Bay.jpg")
        >>> image2 = load_image("https://cdn.britannica.com/59/94459-050-DBA42467/Skyline-Chicago.jpg")
        >>> image3 = load_image("https://cdn.britannica.com/68/170868-050-8DDE8263/Golden-Gate-Bridge-San-Francisco.jpg")

        >>> processor = AutoProcessor.from_pretrained("HuggingFaceTB/SmolVLM2-2.2B-Instruct")
        >>> model = AutoModelForImageTextToText.from_pretrained("HuggingFaceTB/SmolVLM2-2.2B-Instruct", torch_dtype=torch.bfloat16, device_map="auto")

        >>> # Create inputs
        >>> messages = [
        ...     {
        ...         "role": "user",
        ...         "content": [
        ...             {"type": "video", "path": path/to/video},
        ...             {"type": "text", "text": "What is happening in this video?"},
        ...         ]
        ...     }
        ... ]

        >>> inputs = processor.apply_chat_template([messages], add_generation_prompt=True)

        >>> # Generate
        >>> generated_ids = model.generate(**inputs, max_new_tokens=256)
        >>> generated_texts = processor.batch_decode(generated_ids, skip_special_tokens=True)

        >>> print(generated_texts)
        ```"""
        super().forward(**super_kwargs)


__all__ = [
    "SmolVLMVisionConfig",
    "SmolVLMConfig",
    "SmolVLMImageProcessor",
    "SmolVLMForConditionalGeneration",
    "SmolVLMPreTrainedModel",
    "SmolVLMModel",
    "SmolVLMVisionTransformer",
]
