# Open Source Model Licensed under the Apache License Version 2.0 
# and Other Licenses of the Third-Party Components therein:
# The below Model in this distribution may have been modified by THL A29 Limited 
# ("Tencent Modifications"). All Tencent Modifications are Copyright (C) 2024 THL A29 Limited.

# Copyright (C) 2024 THL A29 Limited, a Tencent company.  All rights reserved. 
# The below software and/or models in this distribution may have been 
# modified by THL A29 Limited ("Tencent Modifications"). 
# All Tencent Modifications are Copyright (C) THL A29 Limited.

# Hunyuan 3D is licensed under the TENCENT HUNYUAN NON-COMMERCIAL LICENSE AGREEMENT 
# except for the third-party components listed below. 
# Hunyuan 3D does not impose any additional limitations beyond what is outlined 
# in the repsective licenses of these third-party components. 
# Users must comply with all terms and conditions of original licenses of these third-party 
# components and must ensure that the usage of the third party components adheres to 
# all relevant laws and regulations. 

# For avoidance of doubts, Hunyuan 3D means the large language models and 
# their software and algorithms, including trained model weights, parameters (including 
# optimizer states), machine-learning model code, inference-enabling code, training-enabling code, 
# fine-tuning enabling code and other elements of the foregoing made publicly available 
# by Tencent in accordance with TENCENT HUNYUAN COMMUNITY LICENSE AGREEMENT.

import os, sys
sys.path.insert(0, f"{os.path.dirname(os.path.dirname(os.path.abspath(__file__)))}")

import time
import torch
import random
import numpy as np
from PIL import Image
from einops import rearrange
from PIL import Image, ImageSequence

from infer.utils import seed_everything, timing_decorator, auto_amp_inference
from infer.utils import get_parameter_number, set_parameter_grad_false, str_to_bool
from svrm.predictor import MV23DPredictor


class Views2Mesh():
    def __init__(self, mv23d_cfg_path, mv23d_ckt_path, 
                 device="cuda:0", use_lite=False, save_memory=False):
        '''
            mv23d_cfg_path: config yaml file 
            mv23d_ckt_path: path to ckpt
            use_lite: lite version
            save_memory: cpu auto
        '''
        self.device = device
        self.save_memory = save_memory
        self.mv23d_predictor = MV23DPredictor(
            mv23d_ckt_path, 
            mv23d_cfg_path, 
            device = "cpu" if save_memory else device
        )  
        self.mv23d_predictor.model.eval()
        self.order = [0, 1, 2, 3, 4, 5] if use_lite else [0, 2, 4, 5, 3, 1]
        set_parameter_grad_false(self.mv23d_predictor.model)
        print('view2mesh model', get_parameter_number(self.mv23d_predictor.model))

    @torch.no_grad()
    @timing_decorator("views to mesh")
    @auto_amp_inference
    def __call__(self, *args, **kwargs):
        if self.save_memory:
            self.mv23d_predictor.model = self.mv23d_predictor.model.to(self.device)
            torch.cuda.empty_cache()
            res = self.call(*args, **kwargs)
            self.mv23d_predictor.model = self.mv23d_predictor.model.to("cpu")
        else:
            res = self.call(*args, **kwargs)
        torch.cuda.empty_cache()
        return res

    def call(
        self,
        views_pil=None, 
        cond_pil=None, 
        gif_pil=None, 
        seed=0, 
        target_face_count = 10000,
        do_texture_mapping = True,
        save_folder='./outputs/test'
    ):
        '''
            can set views_pil, cond_pil simutaously or set gif_pil only
            seed: int
            target_face_count: int 
            save_folder: path to save mesh files
        '''
        save_dir = save_folder
        os.makedirs(save_dir, exist_ok=True)

        if views_pil is not None and cond_pil is not None:
            show_image = rearrange(np.asarray(views_pil, dtype=np.uint8), 
                                   '(n h) (m w) c -> (n m) h w c', n=3, m=2)
            views = [Image.fromarray(show_image[idx]) for idx in self.order] 
            image_list = [cond_pil]+ views
            image_list = [img.convert('RGB') for img in image_list]
        elif gif_pil is not None:
            image_list = [img.convert('RGB') for img in ImageSequence.Iterator(gif_pil)]
        
        image_input = image_list[0]
        image_list = image_list[1:] + image_list[:1]
        
        seed_everything(seed)
        self.mv23d_predictor.predict(
            image_list, 
            save_dir = save_dir, 
            image_input = image_input,
            target_face_count = target_face_count,
            do_texture_mapping = do_texture_mapping
        )
        torch.cuda.empty_cache()


if __name__ == "__main__":
    
    import argparse
    
    def get_args():
        parser = argparse.ArgumentParser()
        parser.add_argument("--views_path", type=str, required=True)
        parser.add_argument("--cond_path", type=str, required=True)
        parser.add_argument("--save_folder", default="./outputs/test/", type=str)
        parser.add_argument("--mv23d_cfg_path", default="./svrm/configs/svrm.yaml", type=str)
        parser.add_argument("--mv23d_ckt_path", default="weights/svrm/svrm.safetensors", type=str)
        parser.add_argument("--max_faces_num", default=90000, type=int, 
            help="max num of face, suggest 90000 for effect, 10000 for speed")
        parser.add_argument("--device", default="cuda:0", type=str)
        parser.add_argument("--use_lite", default='false', type=str)
        parser.add_argument("--do_texture_mapping", default='false', type=str)
        
        return parser.parse_args()
        
    args = get_args()
    args.use_lite = str_to_bool(args.use_lite)
    args.do_texture_mapping = str_to_bool(args.do_texture_mapping)

    views = Image.open(args.views_path)
    cond = Image.open(args.cond_path)

    views_to_mesh_model = Views2Mesh(
        args.mv23d_cfg_path, 
        args.mv23d_ckt_path,
        device = args.device, 
        use_lite = args.use_lite
    )

    views_to_mesh_model(
        views,  cond,  0,
        target_face_count = args.max_faces_num,
        save_folder = args.save_folder,
        do_texture_mapping = args.do_texture_mapping
    )