from __future__ import annotations

import os
import shutil
import stat
import subprocess
import tempfile
from pathlib import Path

from huggingface_hub import HfFolder


ROOT = Path(__file__).resolve().parents[1]
REPO_ID = "Lightcap/pcmt-artifact"
PAYLOAD_DIR = ROOT / "submission" / "hf_dataset_tree"
CHECKOUT_DIR = ROOT / "submission" / "hf_git_repo"
REMOTE_URL = f"https://huggingface.co/datasets/{REPO_ID}"
LFS_PATTERNS = [
    "data/fixtures/videos/*.mp4",
    "data/real_videos/*.mp4",
    "figures/*.pdf",
    "figures/*.png",
    "runs/remote_gpu/*/windows.jsonl",
]


def run(cmd: list[str], cwd: Path | None = None, env: dict[str, str] | None = None) -> None:
    subprocess.run(cmd, cwd=cwd, env=env, check=True)


def main() -> int:
    token = os.environ.get("HF_TOKEN") or os.environ.get("HUGGINGFACE_HUB_TOKEN") or HfFolder.get_token()
    if not token:
        raise SystemExit("HF_TOKEN is not set and no cached Hugging Face token was found")
    if not PAYLOAD_DIR.exists():
        raise SystemExit(f"Missing staged dataset tree: {PAYLOAD_DIR}")

    if CHECKOUT_DIR.exists():
        run(["git", "fetch", "origin"], cwd=CHECKOUT_DIR)
        run(["git", "checkout", "main"], cwd=CHECKOUT_DIR)
        run(["git", "pull", "--ff-only", "origin", "main"], cwd=CHECKOUT_DIR)
    else:
        CHECKOUT_DIR.parent.mkdir(parents=True, exist_ok=True)
        run(["git", "clone", REMOTE_URL, str(CHECKOUT_DIR)])

    run(["rsync", "-a", "--delete", "--exclude=.git", "--exclude=.cache", f"{PAYLOAD_DIR}/", f"{CHECKOUT_DIR}/"])
    run(["git", "lfs", "install", "--local"], cwd=CHECKOUT_DIR)
    for pattern in LFS_PATTERNS:
        run(["git", "lfs", "track", pattern], cwd=CHECKOUT_DIR)
    run(["git", "add", "-A"], cwd=CHECKOUT_DIR)
    status = subprocess.run(["git", "status", "--porcelain"], cwd=CHECKOUT_DIR, text=True, capture_output=True, check=True)
    if not status.stdout.strip():
        print(f"No changes to upload: {REMOTE_URL}")
        return 0
    run(["git", "commit", "-m", "Publish PCMT artifact as dataset tree"], cwd=CHECKOUT_DIR)
    push_with_token(token)
    print(REMOTE_URL)
    return 0


def push_with_token(token: str) -> None:
    with tempfile.NamedTemporaryFile("w", delete=False, prefix="hf_askpass_", suffix=".sh") as handle:
        askpass = Path(handle.name)
        handle.write(
            "#!/bin/sh\n"
            'case "$1" in\n'
            '  *Username*) printf "%s" "Lightcap" ;;\n'
            '  *) printf "%s" "$HF_TOKEN_FOR_GIT" ;;\n'
            "esac\n"
        )
    askpass.chmod(askpass.stat().st_mode | stat.S_IXUSR)
    env = os.environ.copy()
    env["GIT_ASKPASS"] = str(askpass)
    env["GIT_TERMINAL_PROMPT"] = "0"
    env["HF_TOKEN_FOR_GIT"] = token
    try:
        run(["git", "-c", "credential.helper=", "push", "origin", "main"], cwd=CHECKOUT_DIR, env=env)
    finally:
        askpass.unlink(missing_ok=True)


if __name__ == "__main__":
    raise SystemExit(main())