#!/usr/bin/env python3
"""
从 NiuTrans/Classical-Modern 导入古文原文，生成检索补充 jsonl。

设计原则：
1. 只读取 `古文原文/**/text.txt`
2. 不读取 `双语数据`、`target.txt`、`bitext.txt`、README 等说明文本
3. 以原始文本行/段为单位输出，供评估脚本直接读取原文库，或按需再做轻量预处理
"""

import argparse
import json
from pathlib import Path


SCRIPT_DIR = Path(__file__).resolve().parent
DEFAULT_REPO_ROOT = SCRIPT_DIR / "retrieval_extra" / "vendor" / "Classical-Modern"
DEFAULT_SOURCE_ROOT = DEFAULT_REPO_ROOT / "古文原文"
DEFAULT_OUTPUT_FILE = SCRIPT_DIR / "retrieval_extra" / "classical_modern_originals.jsonl"


def parse_csv_set(spec):
    if not spec:
        return set()
    return {item.strip() for item in str(spec).split(",") if item.strip()}


def iter_source_files(source_root, include_books=None, exclude_books=None):
    include_books = include_books or set()
    exclude_books = exclude_books or set()
    for path in sorted(source_root.rglob("text.txt")):
        rel_parts = path.relative_to(source_root).parts
        if not rel_parts:
            continue
        book = rel_parts[0]
        if include_books and book not in include_books:
            continue
        if book in exclude_books:
            continue
        yield path


def iter_text_units(path):
    with open(path, "r", encoding="utf-8") as f:
        for line in f:
            text = line.strip()
            if text:
                yield text


def main():
    parser = argparse.ArgumentParser(description="导入 Classical-Modern 古文原文为检索补充库")
    parser.add_argument(
        "--repo_root",
        default=str(DEFAULT_REPO_ROOT),
        type=str,
        help="Classical-Modern 仓库根目录",
    )
    parser.add_argument(
        "--source_root",
        default=str(DEFAULT_SOURCE_ROOT),
        type=str,
        help="古文原文目录，默认使用 repo_root/古文原文",
    )
    parser.add_argument(
        "--output_file",
        default=str(DEFAULT_OUTPUT_FILE),
        type=str,
        help="输出 jsonl 文件路径",
    )
    parser.add_argument(
        "--include_books",
        default="",
        type=str,
        help="只导入这些书名，逗号分隔；默认空表示全部导入",
    )
    parser.add_argument(
        "--exclude_books",
        default="",
        type=str,
        help="排除这些书名，逗号分隔",
    )
    parser.add_argument(
        "--progress_every",
        default=5000,
        type=int,
        help="每处理多少条文本打印一次进度",
    )
    args = parser.parse_args()

    repo_root = Path(args.repo_root)
    source_root = Path(args.source_root)
    output_file = Path(args.output_file)
    output_file.parent.mkdir(parents=True, exist_ok=True)

    if not repo_root.exists():
        raise FileNotFoundError(f"repo root not found: {repo_root}")
    if not source_root.exists():
        raise FileNotFoundError(f"source root not found: {source_root}")

    include_books = parse_csv_set(args.include_books)
    exclude_books = parse_csv_set(args.exclude_books)
    progress_every = max(1, args.progress_every)

    file_count = 0
    text_count = 0
    book_counter = {}

    with open(output_file, "w", encoding="utf-8") as fout:
        for path in iter_source_files(
            source_root,
            include_books=include_books,
            exclude_books=exclude_books,
        ):
            rel = path.relative_to(source_root)
            parts = rel.parts
            book = parts[0]
            section = "/".join(parts[1:-1]) if len(parts) > 2 else ""
            file_count += 1

            for text in iter_text_units(path):
                record = {
                    "source": "Classical-Modern",
                    "book": book,
                    "section": section,
                    "path": str(rel),
                    "text": text,
                }
                fout.write(json.dumps(record, ensure_ascii=False) + "\n")
                text_count += 1
                book_counter[book] = book_counter.get(book, 0) + 1
                if text_count % progress_every == 0:
                    print(
                        f"[progress] files={file_count}, texts={text_count}, last={rel}",
                        flush=True,
                    )

    print("=" * 70)
    print("Classical-Modern import finished")
    print("=" * 70)
    print(f"Repo root:         {repo_root}")
    print(f"Source root:       {source_root}")
    print(f"Output file:       {output_file}")
    print(f"Imported files:    {file_count}")
    print(f"Imported texts:    {text_count}")
    print("Top books:")
    for book, cnt in sorted(book_counter.items(), key=lambda x: x[1], reverse=True)[:20]:
        print(f"  - {book}: {cnt}")


if __name__ == "__main__":
    main()