# -------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation.  All rights reserved.
# Licensed under the MIT License.
# --------------------------------------------------------------------------

import logging

from fusion_layernorm import FusionLayerNormalization
from fusion_mha_mmdit import FusionMultiHeadAttentionMMDit
from fusion_options import FusionOptions
from import_utils import is_installed
from onnx import ModelProto
from onnx_model_bert import BertOnnxModel

logger = logging.getLogger(__name__)


class MmditOnnxModel(BertOnnxModel):
    def __init__(self, model: ModelProto, num_heads: int = 0, hidden_size: int = 0):
        """Initialize Multimodal Diffusion Transformer (MMDiT) ONNX Model.

        Args:
            model (ModelProto): the ONNX model
            num_heads (int, optional): number of attention heads. Defaults to 0 (detect the parameter automatically).
            hidden_size (int, optional): hidden dimension. Defaults to 0 (detect the parameter automatically).
        """
        assert (num_heads == 0 and hidden_size == 0) or (num_heads > 0 and hidden_size % num_heads == 0)
        super().__init__(model, num_heads=num_heads, hidden_size=hidden_size)

    def postprocess(self):
        self.prune_graph()
        self.remove_unused_constant()

    def fuse_layer_norm(self):
        layernorm_support_broadcast = True
        logger.warning(
            "The optimized model requires LayerNormalization with broadcast support. "
            "Please use onnxruntime-gpu>=1.21 for inference."
        )
        fusion = FusionLayerNormalization(
            self, check_constant_and_dimension=not layernorm_support_broadcast, force=True
        )
        fusion.apply()

    def fuse_multi_head_attention(self):
        fusion = FusionMultiHeadAttentionMMDit(self)
        fusion.apply()

    def optimize(self, options: FusionOptions | None = None, add_dynamic_axes: bool = False):
        assert not add_dynamic_axes

        if is_installed("tqdm"):
            import tqdm
            from tqdm.contrib.logging import logging_redirect_tqdm

            with logging_redirect_tqdm():
                steps = 5
                progress_bar = tqdm.tqdm(range(steps), initial=0, desc="fusion")
                self._optimize(options, progress_bar)
        else:
            logger.info("tqdm is not installed. Run optimization without progress bar")
            self._optimize(options, None)

    def _optimize(self, options: FusionOptions | None = None, progress_bar=None):
        if (options is not None) and not options.enable_shape_inference:
            self.disable_shape_inference()

        # Remove cast nodes that having same data type of input and output based on symbolic shape inference.
        self.utils.remove_useless_cast_nodes()
        if progress_bar:
            progress_bar.update(1)

        if (options is None) or options.enable_layer_norm:
            self.fuse_layer_norm()
            self.fuse_simplified_layer_norm()
        if progress_bar:
            progress_bar.update(1)

        if (options is None) or options.enable_gelu:
            self.fuse_gelu()
        if progress_bar:
            progress_bar.update(1)

        if (options is None) or options.enable_attention:
            self.fuse_multi_head_attention()
        if progress_bar:
            progress_bar.update(1)

        self.postprocess()
        if progress_bar:
            progress_bar.update(1)

        logger.info(f"opset version: {self.get_opset_version()}")

    def get_fused_operator_statistics(self):
        """
        Returns node count of fused operators.
        """
        op_count = {}
        ops = [
            "FastGelu",
            "MultiHeadAttention",
            "LayerNormalization",
            "SimplifiedLayerNormalization",
        ]

        for op in ops:
            nodes = self.get_nodes_by_op_type(op)
            op_count[op] = len(nodes)

        logger.info(f"Optimized operators:{op_count}")
        return op_count