#!/usr/bin/env python3
"""
读取长文 JSON，计算权重 = 分发realplay_uv / 当日分发曝光uv，按权重降序输出。
每个输入文件单独生成一个输出文件（不合并）。
"""
from __future__ import annotations

import argparse
import json
import math
from pathlib import Path


def load_records(path: Path) -> list[dict]:
    rows: list[dict] = []
    with open(path, encoding="utf-8") as f:
        data = json.load(f)
    if not isinstance(data, list):
        raise ValueError(f"{path} 根节点应为数组")
    for item in data:
        ext = item.get("ext_data") or {}
        expose = ext.get("当日分发曝光uv")
        realplay = ext.get("分发realplay_uv")
        if expose is None or realplay is None:
            continue
        try:
            expose_f = float(expose)
            realplay_f = float(realplay)
        except (TypeError, ValueError):
            continue
        if expose_f <= 0:
            weight = float("nan")
        else:
            weight = realplay_f / expose_f
        rows.append(
            {
                "videoid": str(item.get("videoid", "")),
                "二级品类": item.get("二级品类", ""),
                "权重值": weight,
            }
        )
    return rows


def _sort_key(r: dict) -> tuple:
    w = r["权重值"]
    if math.isnan(w):
        return (1, 0.0)
    return (0, -w)


def default_out_path(inp: Path, out_dir: Path | None) -> Path:
    name = f"{inp.stem}_weight_rank.txt"
    if out_dir is not None:
        return out_dir / name
    return inp.parent / name


def main() -> None:
    base = Path(__file__).resolve().parent / "data" / "changwen_data"
    parser = argparse.ArgumentParser(
        description="长文数据按 分发realplay_uv/当日分发曝光uv 排序；每个输入单独写一个输出文件"
    )
    parser.add_argument(
        "inputs",
        nargs="*",
        type=Path,
        default=[
            base / "奇观妙技有乾坤.json",
            base / "青史铁事漫谈.json",
        ],
        help="输入 JSON 路径（默认两个账号文件）",
    )
    parser.add_argument(
        "--out-dir",
        type=Path,
        default=None,
        help="可选：把所有输出写到该目录（文件名仍为 {原文件名去扩展}_weight_rank.txt）",
    )
    args = parser.parse_args()

    paths = [p.resolve() for p in args.inputs]
    for p in paths:
        if not p.is_file():
            raise SystemExit(f"文件不存在: {p}")

    out_dir = args.out_dir.resolve() if args.out_dir else None
    if out_dir is not None:
        out_dir.mkdir(parents=True, exist_ok=True)

    for p in paths:
        rows = load_records(p)
        rows.sort(key=_sort_key)
        lines = []
        for r in rows:
            w = r["权重值"]
            w_str = "nan" if w != w else f"{w:.6f}"
            lines.append(f"{r['videoid']}\t{r['二级品类']}\t{w_str}")

        out = default_out_path(p, out_dir)
        if out_dir is None:
            out.parent.mkdir(parents=True, exist_ok=True)
        text = "\n".join(lines) + ("\n" if lines else "")
        out.write_text(text, encoding="utf-8")
        print(f"{p.name}: 共 {len(lines)} 行 -> {out}")


if __name__ == "__main__":
    main()