"""
run_benchmark.py
"""
import json
import logging
import os
from datetime import date

import torch
from hydra import compose, initialize
from hydra.core.global_hydra import GlobalHydra
from omegaconf import DictConfig
from tqdm import tqdm

from pyrad.nerf.trainer import Trainer

BENCH = {
    "method": "vanilla_nerf",
    "hydra_base_dir": "outputs/",
    "benchmark_date": "05-26-2022",
    "object_list": ["mic", "ficus", "chair", "hotdog", "materials", "drums", "ship", "lego"],
}


def load_best_ckpt(hydra_dir: str, config: DictConfig) -> str:
    """helper function to update config with latest checkpoint in specified hydra_dir"""
    model_dir = os.path.join(hydra_dir, config.graph.model_dir)
    latest_ckpt = os.listdir(model_dir)
    latest_ckpt.sort()
    latest_ckpt = latest_ckpt[-1]
    step = os.path.splitext(latest_ckpt)[0].split("-")[-1]
    config.graph.resume_train.load_dir = model_dir
    config.graph.resume_train.load_step = int(step)
    config.logging.writer.TensorboardWriter.save_dir = "/tmp/"
    return os.path.join(model_dir, latest_ckpt)


def main():
    """Main function."""
    benchmarks = {}
    hydra_base_dir = BENCH["hydra_base_dir"]
    method = BENCH["method"]
    benchmark_date = BENCH["benchmark_date"]
    for dataset in tqdm(BENCH["object_list"]):
        hydra_dir = f"{hydra_base_dir}/blender_{dataset}_{benchmark_date}/{method}/"
        basename = os.listdir(hydra_dir)[0]
        hydra_dir = f"{hydra_dir}/{basename}"
        initialize(config_path=os.path.join("../../", hydra_dir, ".hydra/"))
        config = compose("config.yaml")
        ckpt = load_best_ckpt(hydra_dir, config)
        trainer = Trainer(config, local_rank=0, world_size=1)
        trainer.setup(test_mode=True)
        avg_psnr = 0
        for step, image_idx in enumerate(config.data.val_image_indices):
            with torch.no_grad():
                psnr = trainer.test_image(image_idx=image_idx, step=step)
            avg_psnr = (step * avg_psnr + psnr) / (step + 1)
        benchmarks[dataset] = (avg_psnr, ckpt)
        GlobalHydra.instance().clear()

    benchmark_info = {"bench": BENCH, "results": benchmarks}
    timestamp = date.today().strftime("%b-%d-%Y")
    json_file = os.path.join(BENCH["hydra_base_dir"], f"{timestamp}.json")
    with open(json_file, "w", encoding="utf8") as f:
        json.dump(benchmark_info, f, indent=2)
    logging.info("saved benchmark results to %s", json_file)


if __name__ == "__main__":
    main()