#!/usr/bin/env python3
"""
人设树 JSON 精简处理：去掉指定字段，输出到目标目录。

进一步精简建议（可选）：
  --minify      单行 JSON，去掉缩进与多余空白（体积可降约 40%+，推荐）
  --round N     数值保留 N 位小数（默认 4，可再减小体积）
  --short-keys  用短键名（t/n/w/r/c/ch），体积最小，但读取时需配合 KEY_MAP 还原
"""
import argparse
import json
from pathlib import Path

# 需要移除的字段
FIELDS_TO_REMOVE = {"_post_ids", "_child_categories_relation", "_child_categories_relation_detail"}

# 短键名映射（仅当 --short-keys 时使用）
KEY_MAP = {
    "_type": "t",
    "_post_count": "n",
    "_persona_weight_score": "w",
    "_ratio": "r",
    "_is_constant": "c",
    "_is_local_constant": "lc",
    "children": "ch",
}
KEY_MAP_INV = {v: k for k, v in KEY_MAP.items()}

INPUT_DIR = Path(__file__).resolve().parent / "input/家有大志/原始数据/tree"
OUTPUT_DIR = Path(__file__).resolve().parent / "input/家有大志/tree"


def strip_fields(obj):
    """递归移除指定字段。"""
    if isinstance(obj, dict):
        for key in list(obj.keys()):
            if key in FIELDS_TO_REMOVE:
                del obj[key]
            else:
                strip_fields(obj[key])
    elif isinstance(obj, list):
        for item in obj:
            strip_fields(item)
    return obj


def round_floats(obj, ndigits: int):
    """递归将浮点数四舍五入到 ndigits 位。"""
    if isinstance(obj, dict):
        for k, v in obj.items():
            obj[k] = round_floats(v, ndigits)
    elif isinstance(obj, list):
        for i, v in enumerate(obj):
            obj[i] = round_floats(v, ndigits)
    elif isinstance(obj, float):
        return round(obj, ndigits)
    return obj


def abbreviate_keys(obj):
    """递归将已知长键名替换为短键名（仅处理 KEY_MAP 中的键）。"""
    if isinstance(obj, dict):
        new_obj = {}
        for k, v in obj.items():
            new_key = KEY_MAP.get(k, k)
            new_obj[new_key] = abbreviate_keys(v)
        return new_obj
    if isinstance(obj, list):
        return [abbreviate_keys(x) for x in obj]
    return obj


def expand_keys(obj):
    """递归将短键名还原为长键名（读取 --short-keys 输出的文件时使用）。"""
    if isinstance(obj, dict):
        new_obj = {}
        for k, v in obj.items():
            new_key = KEY_MAP_INV.get(k, k)
            new_obj[new_key] = expand_keys(v)
        return new_obj
    if isinstance(obj, list):
        return [expand_keys(x) for x in obj]
    return obj


def process_tree_json(
    in_path: Path,
    out_path: Path,
    *,
    minify: bool = False,
    round_ndigits: int | None = None,
    short_keys: bool = False,
) -> None:
    """读取一个树 JSON，精简后写入 out_path。"""
    with open(in_path, "r", encoding="utf-8") as f:
        data = json.load(f)
    strip_fields(data)
    if round_ndigits is not None:
        round_floats(data, round_ndigits)
    if short_keys:
        data = abbreviate_keys(data)
    out_path.parent.mkdir(parents=True, exist_ok=True)
    with open(out_path, "w", encoding="utf-8") as f:
        json.dump(
            data,
            f,
            ensure_ascii=False,
            indent=None if minify else 2,
            separators=(",", ":") if minify else (", ", ": "),
        )
        if minify:
            f.write("\n")


def main():
    parser = argparse.ArgumentParser(description="人设树 JSON 精简")
    parser.add_argument("--minify", action="store_true", help="单行 JSON，减小体积")
    parser.add_argument("--round", type=int, default=None, metavar="N", help="数值保留 N 位小数")
    parser.add_argument("--short-keys", action="store_true", help="使用短键名（读取时需还原）")
    args = parser.parse_args()

    INPUT_DIR.mkdir(parents=True, exist_ok=True)
    OUTPUT_DIR.mkdir(parents=True, exist_ok=True)

    for in_file in sorted(INPUT_DIR.glob("*.json")):
        out_file = OUTPUT_DIR / in_file.name
        process_tree_json(
            in_file,
            out_file,
            minify=args.minify,
            round_ndigits=args.round,
            short_keys=args.short_keys,
        )
        size = out_file.stat().st_size
        print(f"已处理: {in_file.name} -> {out_file} ({size:,} B)")


if __name__ == "__main__":
    main()