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#    Copyright 2023 Haotian Liu
#
#    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 os
import warnings
import shutil

from transformers import AutoTokenizer, AutoModelForCausalLM, AutoConfig, BitsAndBytesConfig
import torch
from objectrelator.model import *

from objectrelator.constants import DEFAULT_IMAGE_PATCH_TOKEN, DEFAULT_IM_START_TOKEN, DEFAULT_IM_END_TOKEN
from objectrelator.train.train_datasets import get_mask_config
from objectrelator.model.language_model.llava_phi import PSALM, PSALMForDAVISEval, ObjectRelator

def load_pretrained_model(model_path, model_base, model_name, model_args, mask_config='./objectrelator/mask_config/maskformer2_swin_base_384_bs16_50ep.yaml', load_8bit=False, load_4bit=False, device_map="auto", device="cuda"):

    kwargs = {"device_map": 'cpu'}

    if load_8bit:
        kwargs['load_in_8bit'] = True
    elif load_4bit:
        kwargs['load_in_4bit'] = True
        kwargs['quantization_config'] = BitsAndBytesConfig(
            load_in_4bit=True,
            bnb_4bit_compute_dtype=torch.float16,
            bnb_4bit_use_double_quant=True,
            bnb_4bit_quant_type='nf4'
        )
    else:
        kwargs['torch_dtype'] = torch.float16

    model_map = {
        'psalm': PSALM,
        'psalm_video': PSALMForDAVISEval,
        'ObjectRelator': ObjectRelator
    }
    mask_cfg = get_mask_config(mask_config)
    mask_cfg.MODEL.MASK_FORMER.SEG_TASK = model_args.seg_task if hasattr(model_args, 'seg_task') else 'instance'

    tokenizer = AutoTokenizer.from_pretrained(model_path, use_fast=True)
    if model_name not in model_map:
        raise ValueError(f"Model {model_name} is not supported. Supported models are: {list(model_map.keys())}")
    model_map_name = model_name #debug
    
    print(f'current model is {model_map_name}')
    model = model_map[model_map_name].from_pretrained(model_path, mask_decoder_cfg=mask_cfg, **kwargs)


    vision_tower = model.get_vision_tower()
    vision_tower.to(device=device)
    image_processor = vision_tower.image_processor

    if hasattr(model.config, "max_sequence_length"):
        context_len = model.config.max_sequence_length
    else:
        context_len = 2048

    return tokenizer, model, image_processor, context_len

	# Copyright 2023 Haotian Liu
	#
	# 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 os
	import warnings
	import shutil

	from transformers import AutoTokenizer, AutoModelForCausalLM, AutoConfig, BitsAndBytesConfig
	import torch
	from objectrelator.model import *

	from objectrelator.constants import DEFAULT_IMAGE_PATCH_TOKEN, DEFAULT_IM_START_TOKEN, DEFAULT_IM_END_TOKEN
	from objectrelator.train.train_datasets import get_mask_config
	from objectrelator.model.language_model.llava_phi import PSALM, PSALMForDAVISEval, ObjectRelator

	def load_pretrained_model(model_path, model_base, model_name, model_args, mask_config='./objectrelator/mask_config/maskformer2_swin_base_384_bs16_50ep.yaml', load_8bit=False, load_4bit=False, device_map="auto", device="cuda"):

	kwargs = {"device_map": 'cpu'}

	if load_8bit:
	kwargs['load_in_8bit'] = True
	elif load_4bit:
	kwargs['load_in_4bit'] = True
	kwargs['quantization_config'] = BitsAndBytesConfig(
	load_in_4bit=True,
	bnb_4bit_compute_dtype=torch.float16,
	bnb_4bit_use_double_quant=True,
	bnb_4bit_quant_type='nf4'
	)
	else:
	kwargs['torch_dtype'] = torch.float16

	model_map = {
	'psalm': PSALM,
	'psalm_video': PSALMForDAVISEval,
	'ObjectRelator': ObjectRelator
	}
	mask_cfg = get_mask_config(mask_config)
	mask_cfg.MODEL.MASK_FORMER.SEG_TASK = model_args.seg_task if hasattr(model_args, 'seg_task') else 'instance'

	tokenizer = AutoTokenizer.from_pretrained(model_path, use_fast=True)
	if model_name not in model_map:
	raise ValueError(f"Model {model_name} is not supported. Supported models are: {list(model_map.keys())}")
	model_map_name = model_name #debug

	print(f'current model is {model_map_name}')
	model = model_map[model_map_name].from_pretrained(model_path, mask_decoder_cfg=mask_cfg, **kwargs)


	vision_tower = model.get_vision_tower()
	vision_tower.to(device=device)
	image_processor = vision_tower.image_processor

	if hasattr(model.config, "max_sequence_length"):
	context_len = model.config.max_sequence_length
	else:
	context_len = 2048

	return tokenizer, model, image_processor, context_len