#!/usr/bin/env python3
"""
将 Few-shot 经验数据集（JSONL）写入 Chroma 持久化向量库。

用法（仓库根目录）：
  python scripts/build_fewshot_chroma_index.py
  python scripts/build_fewshot_chroma_index.py --samples data/experiences/all_samples.jsonl --force

构建完成后在 .env 中设置：
  FEWSHOT_USE_CHROMA=true
  FEWSHOT_CHROMA_PATH=./data/embeddings/chroma_fewshot

Embedding 与 Schema 向量一致，由 OPENAI_* / MODELSCOPE_* / DASHSCOPE_* 等决定。
"""

from __future__ import annotations

import argparse
import json
import logging
import os
import sys
from pathlib import Path

_REPO_ROOT = Path(__file__).resolve().parents[1]
_BACKEND = _REPO_ROOT / "backend"
if str(_BACKEND) not in sys.path:
    sys.path.insert(0, str(_BACKEND))

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
    datefmt="%Y-%m-%d %H:%M:%S",
)
logger = logging.getLogger("build_fewshot_chroma")


def main() -> int:
    parser = argparse.ArgumentParser(description="Few-shot JSONL → Chroma 向量索引")
    parser.add_argument(
        "--samples",
        default=os.getenv("FEWSHOT_DATA_PATH", "data/experiences/all_samples.jsonl"),
        help="JSONL 路径（相对仓库根或绝对路径）",
    )
    parser.add_argument(
        "--persist-dir",
        default=os.getenv("FEWSHOT_CHROMA_PATH", "data/embeddings/chroma_fewshot"),
        help="Chroma 持久化目录",
    )
    parser.add_argument(
        "--force",
        action="store_true",
        help="清空已有集合并全量重建",
    )
    args = parser.parse_args()

    samples_path = Path(args.samples)
    if not samples_path.is_absolute():
        samples_path = _REPO_ROOT / samples_path
    if not samples_path.is_file():
        logger.error("样本文件不存在: %s", samples_path)
        return 1

    from dotenv import load_dotenv

    load_dotenv(_REPO_ROOT / ".env")

    from utils.embedding import get_embedder
    from utils.fewshot_chroma_store import FewShotChromaStore
    from utils.fewshot_selector import ExperienceSample

    rows: list[ExperienceSample] = []
    with samples_path.open("r", encoding="utf-8") as f:
        for line_no, line in enumerate(f, 1):
            line = line.strip()
            if not line:
                continue
            try:
                rows.append(ExperienceSample.from_dict(json.loads(line)))
            except json.JSONDecodeError as e:
                logger.warning("跳过第 %s 行 JSON 错误: %s", line_no, e)

    if not rows:
        logger.error("未解析到任何样本")
        return 1

    embedder = get_embedder()
    persist = Path(args.persist_dir)
    if not persist.is_absolute():
        persist = _REPO_ROOT / persist

    store = FewShotChromaStore(embedder, persist_dir=str(persist), persist_to_disk=True)
    n = store.build_from_samples(rows, force_rebuild=args.force)
    logger.info("完成: 写入 %s 条 → %s", n, persist)
    return 0


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