import logging
import os
import sys

import cv2
import numpy as np
import torch
from transformers import AutoTokenizer, BitsAndBytesConfig, CLIPImageProcessor

from model.LISA import LISAForCausalLM
from model.llava import conversation as conversation_lib
from model.llava.mm_utils import tokenizer_image_token
from model.segment_anything.utils.transforms import ResizeLongestSide
from utils import app_helpers, utils


def main(args):
    args = app_helpers.parse_args(args)
    os.makedirs(args.vis_save_path, exist_ok=True)

    # Create model
    tokenizer = AutoTokenizer.from_pretrained(
        args.version,
        cache_dir=None,
        model_max_length=args.model_max_length,
        padding_side="right",
        use_fast=False,
    )
    tokenizer.pad_token = tokenizer.unk_token
    args.seg_token_idx = tokenizer("[SEG]", add_special_tokens=False).input_ids[0]

    torch_dtype = change_torch_dtype_by_precision(args.precision)

    kwargs = {"torch_dtype": torch_dtype}
    if args.load_in_4bit:
        kwargs.update(
            {
                "torch_dtype": torch.half,
                "load_in_4bit": True,
                "quantization_config": BitsAndBytesConfig(
                    load_in_4bit=True,
                    bnb_4bit_compute_dtype=torch.float16,
                    bnb_4bit_use_double_quant=True,
                    bnb_4bit_quant_type="nf4",
                    llm_int8_skip_modules=["visual_model"],
                ),
            }
        )
    elif args.load_in_8bit:
        kwargs.update(
            {
                "torch_dtype": torch.half,
                "quantization_config": BitsAndBytesConfig(
                    llm_int8_skip_modules=["visual_model"],
                    load_in_8bit=True,
                ),
            }
        )

    model = LISAForCausalLM.from_pretrained(
        args.version, low_cpu_mem_usage=True, vision_tower=args.vision_tower, seg_token_idx=args.seg_token_idx, **kwargs
    )

    model.config.eos_token_id = tokenizer.eos_token_id
    model.config.bos_token_id = tokenizer.bos_token_id
    model.config.pad_token_id = tokenizer.pad_token_id

    model.get_model().initialize_vision_modules(model.get_model().config)
    vision_tower = model.get_model().get_vision_tower()
    vision_tower.to(dtype=torch_dtype)

    if args.precision == "bf16":
        model = model.bfloat16().cuda()
    elif (
        args.precision == "fp16" and (not args.load_in_4bit) and (not args.load_in_8bit)
    ):
        vision_tower = model.get_model().get_vision_tower()
        model.model.vision_tower = None
        import deepspeed

        model_engine = deepspeed.init_inference(
            model=model,
            dtype=torch.half,
            replace_with_kernel_inject=True,
            replace_method="auto",
        )
        model = model_engine.module
        model.model.vision_tower = vision_tower.half().cuda()
    elif args.precision == "fp32":
        model = model.float().cuda()

    vision_tower = model.get_model().get_vision_tower()
    vision_tower.to(device=args.local_rank)

    clip_image_processor = CLIPImageProcessor.from_pretrained(model.config.vision_tower)
    transform = ResizeLongestSide(args.image_size)

    model.eval()

    while True:
        conv = conversation_lib.conv_templates[args.conv_type].copy()
        conv.messages = []

        prompt = input("Please input your prompt: ")
        prompt = utils.DEFAULT_IMAGE_TOKEN + "\n" + prompt
        if args.use_mm_start_end:
            replace_token = (
                utils.DEFAULT_IM_START_TOKEN + utils.DEFAULT_IMAGE_TOKEN + utils.DEFAULT_IM_END_TOKEN
            )
            prompt = prompt.replace(utils.DEFAULT_IMAGE_TOKEN, replace_token)

        conv.append_message(conv.roles[0], prompt)
        conv.append_message(conv.roles[1], "")
        prompt = conv.get_prompt()

        image_path = input("Please input the image path: ")
        if not os.path.exists(image_path):
            print("File not found in {}".format(image_path))
            continue

        image_np = cv2.imread(image_path)
        image_np = cv2.cvtColor(image_np, cv2.COLOR_BGR2RGB)
        original_size_list = [image_np.shape[:2]]

        image_clip = (
            clip_image_processor.preprocess(image_np, return_tensors="pt")[
                "pixel_values"
            ][0]
            .unsqueeze(0)
            .cuda()
        )
        logging.info(f"image_clip type: {type(image_clip)}.")
        image_clip = app_helpers.set_image_precision_by_args(image_clip, args.precision)

        image = transform.apply_image(image_np)
        resize_list = [image.shape[:2]]

        image = (
            app_helpers.preprocess(torch.from_numpy(image).permute(2, 0, 1).contiguous())
            .unsqueeze(0)
            .cuda()
        )
        logging.info(f"image_clip type: {type(image_clip)}.")
        image = app_helpers.set_image_precision_by_args(image, args.precision)

        input_ids = tokenizer_image_token(prompt, tokenizer, return_tensors="pt")
        input_ids = input_ids.unsqueeze(0).cuda()

        output_ids, pred_masks = model.evaluate(
            image_clip,
            image,
            input_ids,
            resize_list,
            original_size_list,
            max_new_tokens=512,
            tokenizer=tokenizer,
        )
        output_ids = output_ids[0][output_ids[0] != utils.IMAGE_TOKEN_INDEX]

        text_output = tokenizer.decode(output_ids, skip_special_tokens=False)
        text_output = text_output.replace("\n", "").replace("  ", " ")
        logging.info(f"text_output: {text_output}.")

        for i, pred_mask in enumerate(pred_masks):
            if pred_mask.shape[0] == 0:
                continue

            pred_mask = pred_mask.detach().cpu().numpy()[0]
            pred_mask = pred_mask > 0

            save_path = "{}/{}_mask_{}.jpg".format(
                args.vis_save_path, image_path.split("/")[-1].split(".")[0], i
            )
            cv2.imwrite(save_path, pred_mask * 100)
            print("{} has been saved.".format(save_path))

            save_path = "{}/{}_masked_img_{}.jpg".format(
                args.vis_save_path, image_path.split("/")[-1].split(".")[0], i
            )
            save_img = image_np.copy()
            save_img[pred_mask] = (
                image_np * 0.5
                + pred_mask[:, :, None].astype(np.uint8) * np.array([255, 0, 0]) * 0.5
            )[pred_mask]
            save_img = cv2.cvtColor(save_img, cv2.COLOR_RGB2BGR)
            cv2.imwrite(save_path, save_img)
            print("{} has been saved.".format(save_path))


def change_torch_dtype_by_precision(precision):
    torch_dtype = torch.float32
    if precision == "bf16":
        torch_dtype = torch.bfloat16
    elif precision == "fp16":
        torch_dtype = torch.half
    return torch_dtype


if __name__ == "__main__":
    main(sys.argv[1:])