"""Normalize pose JSON to a single schema (keypoints + conf + joint index)."""

from __future__ import annotations

import json
import shutil
from pathlib import Path
from typing import Any, Optional


def unify_pose_record(raw: dict[str, Any], image_size: tuple[int, int]) -> dict[str, Any]:
    cand = raw.get("candidate")
    if not cand:
        return {"format": "empty", "image_size": list(image_size), "keypoints": []}
    kps = []
    for row in cand:
        if len(row) >= 4:
            kps.append([float(row[0]), float(row[1]), float(row[2]), int(row[3])])
    return {
        "format": "equifashion_keypoints_v1",
        "image_size": list(image_size),
        "keypoints": kps,
    }


def copy_or_unify_pose(
    src_json: Optional[Path],
    dst_json: Path,
    image_size: tuple[int, int],
) -> bool:
    if src_json is None or not src_json.is_file():
        return False
    with open(src_json, encoding="utf-8") as f:
        raw = json.load(f)
    out = unify_pose_record(raw, image_size)
    dst_json.parent.mkdir(parents=True, exist_ok=True)
    with open(dst_json, "w", encoding="utf-8") as f:
        json.dump(out, f, ensure_ascii=False, indent=2)
    return True


def copy_raw_pose(src: Path, dst: Path) -> None:
    dst.parent.mkdir(parents=True, exist_ok=True)
    shutil.copy2(src, dst)