"""
Generate a large batch of image samples from a model and save them as a large
numpy array. This can be used to produce samples for FID evaluation.
"""

import argparse
import json
import sys
import os

sys.path.append('.')

from pdb import set_trace as st
import imageio
import numpy as np
import torch as th
import torch.distributed as dist

from guided_diffusion import dist_util, logger
from guided_diffusion.script_util import (
    NUM_CLASSES,
    model_and_diffusion_defaults,
    create_model_and_diffusion,
    add_dict_to_argparser,
    args_to_dict,
    continuous_diffusion_defaults,
    control_net_defaults,
)

th.backends.cuda.matmul.allow_tf32 = True
th.backends.cudnn.allow_tf32 = True
th.backends.cudnn.enabled = True

from pathlib import Path

from tqdm import tqdm, trange
import dnnlib
from nsr.train_util_diffusion import TrainLoop3DDiffusion as TrainLoop
from guided_diffusion.continuous_diffusion import make_diffusion as make_sde_diffusion
import nsr
import nsr.lsgm
from nsr.script_util import create_3DAE_model, encoder_and_nsr_defaults, loss_defaults, AE_with_Diffusion, rendering_options_defaults, eg3d_options_default, dataset_defaults

from datasets.shapenet import load_eval_data
from torch.utils.data import Subset
from datasets.eg3d_dataset import init_dataset_kwargs

from transport.train_utils import parse_transport_args

SEED = 0


def main(args):

    # args.rendering_kwargs = rendering_options_defaults(args)

    dist_util.setup_dist(args)
    logger.configure(dir=args.logdir)

    th.cuda.empty_cache()

    th.cuda.manual_seed_all(SEED)
    np.random.seed(SEED)

    # * set denoise model args
    logger.log("creating model and diffusion...")
    args.img_size = [args.image_size_encoder]
    # ! no longer required for LDM
    # args.denoise_in_channels = args.out_chans
    # args.denoise_out_channels = args.out_chans
    args.image_size = args.image_size_encoder  # 224, follow the triplane size

    denoise_model, diffusion = create_model_and_diffusion(
        **args_to_dict(args,
                       model_and_diffusion_defaults().keys()))

    # if 'cldm' in args.trainer_name:
    #     assert isinstance(denoise_model, tuple)
    #     denoise_model, controlNet = denoise_model

    #     controlNet.to(dist_util.dev())
    #     controlNet.train()
    # else:
        # controlNet = None

    opts = eg3d_options_default()
    if args.sr_training:
        args.sr_kwargs = dnnlib.EasyDict(
            channel_base=opts.cbase,
            channel_max=opts.cmax,
            fused_modconv_default='inference_only',
            use_noise=True
        )  # ! close noise injection? since noise_mode='none' in eg3d

    # denoise_model.load_state_dict(
    #     dist_util.load_state_dict(args.ddpm_model_path, map_location="cpu"))
    denoise_model.to(dist_util.dev())
    if args.use_fp16:
        denoise_model.convert_to_fp16()
    denoise_model.eval()

    # * auto-encoder reconstruction model
    logger.log("creating 3DAE...")
    auto_encoder = create_3DAE_model(
        **args_to_dict(args,
                       encoder_and_nsr_defaults().keys()))

    auto_encoder.to(dist_util.dev())
    auto_encoder.eval()

    # TODO, how to set the scale?
    logger.log("create dataset")

    if args.objv_dataset:
        from datasets.g_buffer_objaverse import load_data, load_eval_data, load_memory_data, load_wds_data
    else:  # shapenet
        from datasets.shapenet import load_data, load_eval_data, load_memory_data
    
    # load data if i23d
    if args.i23d:
        data = load_eval_data(
            file_path=args.eval_data_dir,
            batch_size=args.eval_batch_size,
            reso=args.image_size,
            reso_encoder=args.image_size_encoder,  # 224 -> 128
            num_workers=args.num_workers,
            load_depth=True,  # for evaluation
            preprocess=auto_encoder.preprocess,
            **args_to_dict(args,
                            dataset_defaults().keys()))
    else:
        data = None # t23d sampling, only caption required


    TrainLoop = {
        'vpsde_crossattn': nsr.lsgm.TrainLoop3DDiffusionLSGM_crossattn,
        'vpsde_crossattn_objv': nsr.crossattn_cldm_objv.TrainLoop3DDiffusionLSGM_crossattn, # for api compat
        'sgm_legacy':
        nsr.lsgm.sgm_DiffusionEngine.DiffusionEngineLSGM,
        'flow_matching':
        nsr.lsgm.flow_matching_trainer.FlowMatchingEngine,
    }[args.trainer_name]

    # continuous
    if 'vpsde' in args.trainer_name:
        sde_diffusion = make_sde_diffusion(
            dnnlib.EasyDict(
                args_to_dict(args,
                             continuous_diffusion_defaults().keys())))
        # assert args.mixed_prediction, 'enable mixed_prediction by default'
        logger.log('create VPSDE diffusion.')
    else:
        sde_diffusion = None

    auto_encoder.decoder.rendering_kwargs = args.rendering_kwargs

    training_loop_class = TrainLoop(rec_model=auto_encoder,
                                    denoise_model=denoise_model,
                                    control_model=None, # to remove
                                    diffusion=diffusion,
                                    sde_diffusion=sde_diffusion,
                                    loss_class=None,
                                    data=data,
                                    eval_data=None,
                                    **vars(args))

    logger.log("sampling...")
    dist_util.synchronize()

    if dist_util.get_rank() == 0:

        (Path(logger.get_dir()) / 'FID_Cals').mkdir(exist_ok=True,
                                                    parents=True)

        with open(os.path.join(args.logdir, 'args.json'), 'w') as f:
            json.dump(vars(args), f, indent=2)

        # ! use pre-saved camera pose form g-buffer objaverse
        # camera = th.load('assets/objv_eval_pose.pt', map_location=dist_util.dev())[0:25]
        camera = th.load('assets/objv_eval_pose.pt', map_location=dist_util.dev())[:]

        # camera = th.cat([camera.reshape(36,16),train_c.repeat(36,1)[:,16:]], -1)

        # ! debug cfg

        # for unconditional_guidance_scale in [1,2,3,4,5,6,6.5,7]:
        # for unconditional_guidance_scale in [4,5,6,7,8,9,10]:

        all_prompts_available = [
            # prompts used in the paper:
            'The Eiffel tower.',  # 0-3
            'a stone water well with a wooden shed.', # 7 9 15 19 23 24 28
            'A wooden chest with golden trim', # 3 5 6 7
            'A plate of sushi.',  # 0 3 7 11 16
            'A blue platic chair', # 0 1 2 3
            # Prompt NOT USED (From Volume diffusion):
            # 'A wooden worktable', 
            # 'An engineer', 
            # 'A bowl of food.', 
            # "a voxelized dog",
            # 'A castle made of stone',
            # 'A blue robot with a humanoid body',
            # 'A stone fountain with a spout.',
            # 'A wooden desk with a drawer.',
            # 'A green toy dinosaur',
            # 'A dragon with a crown on its head and wings',
            # 'A purple dragon toy with horns.', # not bad
            # 'A red rose in a brown pot.',
            # 'A black camera with a lens.',
            # 'A 18th century cannon.',
            # 'A birthday cupcake', 
            # 'A superman.', 
            # 'A tank', 
            # 'A Doughnut.', 
            # 'An UFO space aircraft',
            # 'A sailboat.',
            # 'A cute toy cat',
            # 'A red mushroom.', 
            # 'A red racing car.',
            # 'A bird with a red hat',
            # 'A happy pikachu.', 
            # from volumeDiffusion
        ]

        prompts_and_seed_to_render = {
            'The Eiffel tower.': np.array([20, 19, 18, 31, 26, 25, 22]),  # 0-3
            'a stone water well with a wooden shed.': np.array([7, 9, 15, 19, 23, 24, 28]),
            'A wooden chest with golden trim': np.array([3, 5, 6, 7]), 
            'A plate of sushi.': np.array([0, 3, 7, 11, 16]), 
            'A blue platic chair': np.array([0, 1, 2, 3]),
        }

        for prompt, seeds in prompts_and_seed_to_render.items():

            training_loop_class.eval_cldm(
                    # prompt=args.prompt,
                    prompt=prompt,
                    unconditional_guidance_scale=args.
                    unconditional_guidance_scale,
                    # unconditional_guidance_scale=unconditional_guidance_scale,
                    use_ddim=args.use_ddim,
                    save_img=args.save_img,
                    use_train_trajectory=args.use_train_trajectory,
                    camera=camera,
                    num_instances=args.num_instances,
                    num_samples=args.num_samples,
                    export_mesh=args.export_mesh, 
                    idx_to_render=seeds,
                )


    dist.barrier()
    logger.log("sampling complete")


def create_argparser():
    defaults = dict(
        image_size_encoder=224,
        triplane_scaling_divider=1.0,  # divide by this value
        diffusion_input_size=-1,
        trainer_name='adm',
        use_amp=False,
        # triplane_scaling_divider=1.0, # divide by this value

        # * sampling flags
        clip_denoised=False,
        num_samples=10,
        num_instances=10, # for i23d, loop different condition
        use_ddim=False,
        ddpm_model_path="",
        cldm_model_path="",
        rec_model_path="",

        # * eval logging flags
        logdir="/mnt/lustre/yslan/logs/nips23/",
        data_dir="",
        eval_data_dir="",
        eval_batch_size=1,
        num_workers=1,

        # * training flags for loading TrainingLoop class
        overfitting=False,
        image_size=128,
        iterations=150000,
        schedule_sampler="uniform",
        anneal_lr=False,
        lr=5e-5,
        weight_decay=0.0,
        lr_anneal_steps=0,
        batch_size=1,
        microbatch=-1,  # -1 disables microbatches
        ema_rate="0.9999",  # comma-separated list of EMA values
        log_interval=50,
        eval_interval=2500,
        save_interval=10000,
        resume_checkpoint="",
        resume_cldm_checkpoint="",
        resume_checkpoint_EG3D="",
        use_fp16=False,
        fp16_scale_growth=1e-3,
        load_submodule_name='',  # for loading pretrained auto_encoder model
        ignore_resume_opt=False,
        freeze_ae=False,
        denoised_ae=True,
        # inference prompt
        prompt="a red chair",
        interval=1,
        save_img=False,
        use_train_trajectory=
        False,  # use train trajectory to sample images for fid calculation
        unconditional_guidance_scale=1.0,
        use_eos_feature=False,
        export_mesh=False,
        cond_key='caption',
        allow_tf32=True,
    )

    defaults.update(model_and_diffusion_defaults())
    defaults.update(encoder_and_nsr_defaults())  # type: ignore
    defaults.update(loss_defaults())
    defaults.update(continuous_diffusion_defaults())
    defaults.update(control_net_defaults())
    defaults.update(dataset_defaults())

    parser = argparse.ArgumentParser()
    add_dict_to_argparser(parser, defaults)

    parse_transport_args(parser)

    return parser


if __name__ == "__main__":

    # os.environ["TORCH_CPP_LOG_LEVEL"] = "INFO"
    # os.environ["NCCL_DEBUG"] = "INFO"

    os.environ[
        "TORCH_DISTRIBUTED_DEBUG"] = "DETAIL"  # set to DETAIL for runtime logging.

    args = create_argparser().parse_args()

    args.local_rank = int(os.environ["LOCAL_RANK"])
    args.gpus = th.cuda.device_count()

    args.rendering_kwargs = rendering_options_defaults(args)

    main(args)