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import subprocess
import sys
from pathlib import Path
from typing import Literal, TypedDict
from PIL import Image

import numpy as np
import torch
from jaxtyping import Float, Int, UInt8
from torch import Tensor
from tqdm import tqdm
import argparse
import json
import os

from glob import glob


parser = argparse.ArgumentParser()
parser.add_argument("--input_dir", type=str, help="original dataset directory")
parser.add_argument("--output_dir", type=str, help="processed dataset directory")
parser.add_argument(
    "--img_subdir",
    type=str,
    default="images_8",
    help="image directory name",
    choices=[
        "images_4",
        "images_8",
    ],
)
parser.add_argument("--n_test", type=int, default=10, help="test skip")
parser.add_argument("--which_stage", type=str, default=None, help="dataset directory")
parser.add_argument("--detect_overlap", action="store_true")

args = parser.parse_args()


INPUT_DIR = Path(args.input_dir)
OUTPUT_DIR = Path(args.output_dir)


# Target 200 MB per chunk.
TARGET_BYTES_PER_CHUNK = int(2e8)


def get_example_keys(stage: Literal["test", "train"]) -> list[str]:
    image_keys = set(
        example.name
        for example in tqdm(list((INPUT_DIR / stage).iterdir()), desc="Indexing scenes")
        if example.is_dir() and not example.name.startswith(".")
    )
    # keys = image_keys & metadata_keys
    keys = image_keys
    # print(keys)
    print(f"Found {len(keys)} keys.")
    return sorted(list(keys))


def get_size(path: Path) -> int:
    """Get file or folder size in bytes."""
    return int(subprocess.check_output(["du", "-b", path]).split()[0].decode("utf-8"))


def load_raw(path: Path) -> UInt8[Tensor, " length"]:
    return torch.tensor(np.memmap(path, dtype="uint8", mode="r"))


def load_images(example_path: Path) -> dict[int, UInt8[Tensor, "..."]]:
    """Load JPG images as raw bytes (do not decode)."""

    return {
        int(path.stem.split("_")[-1]): load_raw(path)
        for path in example_path.iterdir()
        if path.suffix.lower() not in [".npz"]
    }


class Metadata(TypedDict):
    url: str
    timestamps: Int[Tensor, " camera"]
    cameras: Float[Tensor, "camera entry"]


class Example(Metadata):
    key: str
    images: list[UInt8[Tensor, "..."]]


def load_metadata(example_path: Path) -> Metadata:
    blender2opencv = np.array(
        [[1, 0, 0, 0], [0, -1, 0, 0], [0, 0, -1, 0], [0, 0, 0, 1]]
    )
    url = str(example_path).split("/")[-3]
    with open(example_path, "r") as f:
        meta_data = json.load(f)

    store_h, store_w = meta_data["h"], meta_data["w"]
    fx, fy, cx, cy = (
        meta_data["fl_x"],
        meta_data["fl_y"],
        meta_data["cx"],
        meta_data["cy"],
    )
    saved_fx = float(fx) / float(store_w)
    saved_fy = float(fy) / float(store_h)
    saved_cx = float(cx) / float(store_w)
    saved_cy = float(cy) / float(store_h)

    timestamps = []
    cameras = []
    opencv_c2ws = []  # will be used to calculate camera distance

    for frame in meta_data["frames"]:
        timestamps.append(
            int(os.path.basename(frame["file_path"]).split(".")[0].split("_")[-1])
        )
        camera = [saved_fx, saved_fy, saved_cx, saved_cy, 0.0, 0.0]
        # transform_matrix is in blender c2w, while we need to store opencv w2c matrix here
        opencv_c2w = np.array(frame["transform_matrix"]) @ blender2opencv
        opencv_c2ws.append(opencv_c2w)
        camera.extend(np.linalg.inv(opencv_c2w)[:3].flatten().tolist())
        cameras.append(np.array(camera))

    # timestamp should be the one that match the above images keys, use for indexing
    timestamps = torch.tensor(timestamps, dtype=torch.int64)
    cameras = torch.tensor(np.stack(cameras), dtype=torch.float32)

    return {"url": url, "timestamps": timestamps, "cameras": cameras}


def partition_train_test_splits(root_dir, n_test=10):
    sub_folders = sorted(glob(os.path.join(root_dir, "*/")))
    test_list = sub_folders[::n_test]
    train_list = [x for x in sub_folders if x not in test_list]
    out_dict = {"train": train_list, "test": test_list}
    return out_dict


def is_image_shape_matched(image_dir, target_shape):
    image_path = sorted(glob(str(image_dir / "*")))
    if len(image_path) == 0:
        return False

    image_path = image_path[0]
    try:
        im = Image.open(image_path)
    except:
        return False
    w, h = im.size
    if (h, w) == target_shape:
        return True
    else:
        return False


def legal_check_for_all_scenes(root_dir, target_shape):
    valid_folders = []
    sub_folders = sorted(glob(os.path.join(root_dir, "*/nerfstudio")))
    for sub_folder in tqdm(sub_folders, desc="checking scenes..."):
        img_dir = os.path.join(sub_folder, "images_8")  # 270x480
        # img_dir = os.path.join(sub_folder, 'images_4')  # 540x960
        if not is_image_shape_matched(Path(img_dir), target_shape):
            print(f"image shape does not match for {sub_folder}")
            continue
        pose_file = os.path.join(sub_folder, "transforms.json")
        if not os.path.isfile(pose_file):
            print(f"cannot find pose file for {sub_folder}")
            continue

        valid_folders.append(sub_folder)

    return valid_folders


if __name__ == "__main__":
    if "images_8" in args.img_subdir:
        target_shape = (270, 480)  # (h, w)
    elif "images_4" in args.img_subdir:
        target_shape = (540, 960)
    else:
        raise ValueError

    print("checking all scenes...")
    valid_scenes = legal_check_for_all_scenes(INPUT_DIR, target_shape)
    print("valid scenes:", len(valid_scenes))

    for stage in ["test"]:

        error_logs = []
        image_dirs = valid_scenes

        chunk_size = 0
        chunk_index = 0
        chunk: list[Example] = []

        def save_chunk():
            global chunk_size
            global chunk_index
            global chunk

            chunk_key = f"{chunk_index:0>6}"
            dir = OUTPUT_DIR / stage
            dir.mkdir(exist_ok=True, parents=True)
            torch.save(chunk, dir / f"{chunk_key}.torch")

            # Reset the chunk.
            chunk_size = 0
            chunk_index += 1
            chunk = []

        for image_dir in tqdm(image_dirs, desc=f"Processing {stage}"):
            key = os.path.basename(os.path.dirname(image_dir.strip("/")))

            image_dir = Path(image_dir) / "images_8"  # 270x480
            # image_dir = Path(image_dir) / 'images_4'  # 540x960

            num_bytes = get_size(image_dir)

            # Read images and metadata.
            try:
                images = load_images(image_dir)
            except:
                print("image loading error")
                continue
            meta_path = image_dir.parent / "transforms.json"
            if not meta_path.is_file():
                error_msg = f"---------> [ERROR] no meta file in {key}, skip."
                print(error_msg)
                error_logs.append(error_msg)
                continue
            example = load_metadata(meta_path)

            # Merge the images into the example.
            try:
                example["images"] = [
                    images[timestamp.item()] for timestamp in example["timestamps"]
                ]
            except:
                error_msg = f"---------> [ERROR] Some images missing in {key}, skip."
                print(error_msg)
                error_logs.append(error_msg)
                continue

            # Add the key to the example.
            example["key"] = key

            chunk.append(example)
            chunk_size += num_bytes

            if chunk_size >= TARGET_BYTES_PER_CHUNK:
                save_chunk()

        if chunk_size > 0:
            save_chunk()