# Adapted from https://github.com/huggingface/transformers/issues/9920#issuecomment-770970712

import torch
import os

import tensorflow as tf

from transformers import ConvBertConfig, ConvBertForMaskedLM, ConvBertPreTrainedModel
from transformers.utils import logging
from operator import attrgetter

logger = logging.get_logger(__name__)

config_file = "/researchdisk/convbert-base-generator-finnish/config.json"
tf_path = "/researchdisk/convbert-base-finnish/renamed-model.ckpt"
pytorch_dump_path = "/researchdisk/convbert-base-generator-finnish"
config = ConvBertConfig.from_json_file(config_file)

model = ConvBertForMaskedLM(config)

def load_tf_weights_in_convbert(model, config, tf_checkpoint_path):
    """Load tf checkpoints in a pytorch model."""
    try:
        import tensorflow as tf
    except ImportError:
        logger.error(
            "Loading a TensorFlow model in PyTorch, requires TensorFlow to be installed. Please see "
            "https://www.tensorflow.org/install/ for installation instructions."
        )
        raise
    tf_path = os.path.abspath(tf_checkpoint_path)
    logger.info("Converting TensorFlow checkpoint from {}".format(tf_path))
    # Load weights from TF model
    init_vars = tf.train.list_variables(tf_path)
    tf_data = {}
    for name, shape in init_vars:
        logger.info("Loading TF weight {} with shape {}".format(name, shape))
        array = tf.train.load_variable(tf_path, name)
        tf_data[name] = array

    param_mapping = {
        "convbert.embeddings.word_embeddings.weight": "electra/embeddings/word_embeddings",
        "convbert.embeddings.position_embeddings.weight": "electra/embeddings/position_embeddings",
        "convbert.embeddings.token_type_embeddings.weight": "electra/embeddings/token_type_embeddings",
        "convbert.embeddings.LayerNorm.weight": "electra/embeddings/LayerNorm/gamma",
        "convbert.embeddings.LayerNorm.bias": "electra/embeddings/LayerNorm/beta",
        "convbert.embeddings_project.weight": "generator/embeddings_project/kernel",
        "convbert.embeddings_project.bias": "generator/embeddings_project/bias",
        "generator_predictions.LayerNorm.weight": "generator_predictions/LayerNorm/gamma",
        "generator_predictions.LayerNorm.bias": "generator_predictions/LayerNorm/beta",
        "generator_predictions.dense.weight": "generator_predictions/dense/kernel",
        "generator_predictions.dense.bias": "generator_predictions/dense/bias",
        "generator_lm_head.bias": "generator_predictions/output_bias"
    }
    if config.num_groups > 1:
        group_dense_name = "g_dense"
    else:
        group_dense_name = "dense"

    for j in range(config.num_hidden_layers):
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.query.weight"
        ] = f"generator/encoder/layer_{j}/attention/self/query/kernel"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.query.bias"
        ] = f"generator/encoder/layer_{j}/attention/self/query/bias"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.key.weight"
        ] = f"generator/encoder/layer_{j}/attention/self/key/kernel"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.key.bias"
        ] = f"generator/encoder/layer_{j}/attention/self/key/bias"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.value.weight"
        ] = f"generator/encoder/layer_{j}/attention/self/value/kernel"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.value.bias"
        ] = f"generator/encoder/layer_{j}/attention/self/value/bias"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.key_conv_attn_layer.depthwise.weight"
        ] = f"generator/encoder/layer_{j}/attention/self/conv_attn_key/depthwise_kernel"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.key_conv_attn_layer.pointwise.weight"
        ] = f"generator/encoder/layer_{j}/attention/self/conv_attn_key/pointwise_kernel"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.key_conv_attn_layer.bias"
        ] = f"generator/encoder/layer_{j}/attention/self/conv_attn_key/bias"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.conv_kernel_layer.weight"
        ] = f"generator/encoder/layer_{j}/attention/self/conv_attn_kernel/kernel"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.conv_kernel_layer.bias"
        ] = f"generator/encoder/layer_{j}/attention/self/conv_attn_kernel/bias"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.conv_out_layer.weight"
        ] = f"generator/encoder/layer_{j}/attention/self/conv_attn_point/kernel"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.self.conv_out_layer.bias"
        ] = f"generator/encoder/layer_{j}/attention/self/conv_attn_point/bias"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.output.dense.weight"
        ] = f"generator/encoder/layer_{j}/attention/output/dense/kernel"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.output.LayerNorm.weight"
        ] = f"generator/encoder/layer_{j}/attention/output/LayerNorm/gamma"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.output.dense.bias"
        ] = f"generator/encoder/layer_{j}/attention/output/dense/bias"
        param_mapping[
            f"convbert.encoder.layer.{j}.attention.output.LayerNorm.bias"
        ] = f"generator/encoder/layer_{j}/attention/output/LayerNorm/beta"
        param_mapping[
            f"convbert.encoder.layer.{j}.intermediate.dense.weight"
        ] = f"generator/encoder/layer_{j}/intermediate/{group_dense_name}/kernel"
        param_mapping[
            f"convbert.encoder.layer.{j}.intermediate.dense.bias"
        ] = f"generator/encoder/layer_{j}/intermediate/{group_dense_name}/bias"
        param_mapping[
            f"convbert.encoder.layer.{j}.output.dense.weight"
        ] = f"generator/encoder/layer_{j}/output/{group_dense_name}/kernel"
        param_mapping[
            f"convbert.encoder.layer.{j}.output.dense.bias"
        ] = f"generator/encoder/layer_{j}/output/{group_dense_name}/bias"
        param_mapping[
            f"convbert.encoder.layer.{j}.output.LayerNorm.weight"
        ] = f"generator/encoder/layer_{j}/output/LayerNorm/gamma"
        param_mapping[f"convbert.encoder.layer.{j}.output.LayerNorm.bias"] = f"generator/encoder/layer_{j}/output/LayerNorm/beta"

    for param in model.named_parameters():
        param_name = param[0]
        retriever = attrgetter(param_name)
        result = retriever(model)
        tf_name = param_mapping[param_name]
        value = torch.from_numpy(tf_data[tf_name])
        logger.info(f"TF: {tf_name}, PT: {param_name} ")
        if tf_name.endswith("/kernel"):
            if not tf_name.endswith("/intermediate/g_dense/kernel"):
                if not tf_name.endswith("/output/g_dense/kernel"):
                    value = value.T
        if tf_name.endswith("/depthwise_kernel"):
            value = value.permute(1, 2, 0)  # 2, 0, 1
        if tf_name.endswith("/pointwise_kernel"):
            value = value.permute(2, 1, 0)  # 2, 1, 0
        if tf_name.endswith("/conv_attn_key/bias"):
            value = value.unsqueeze(-1)
        result.data = value
    return model

model = load_tf_weights_in_convbert(model, config, tf_path)
model.save_pretrained(pytorch_dump_path)