"""
Parse 常问问题对应SQL_50个问题知识库_Workbuddy生成.md into JSONL aligned with all_samples.jsonl.
Merges schema_info, tags, difficulty from all_samples when qid matches.
"""
from __future__ import annotations

import json
import re
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
MD_PATH = ROOT / "data" / "常问问题对应SQL_50个问题知识库_Workbuddy生成.md"
REF_JSONL = ROOT / "data" / "experiences" / "all_samples.jsonl"
OUT_PATH = ROOT / "data" / "experiences" / "workbuddy_50_questions.jsonl"

# `question_en` right after `question_zh` so long lines are easy to spot in editors.
JSONL_KEY_ORDER = [
    "qid",
    "question_zh",
    "question_en",
    "sql",
    "schema_info",
    "explanation",
    "rating",
    "execution_result",
    "result_note",
    "tags",
    "difficulty",
]

CJK_RE = re.compile(r"[\u4e00-\u9fff\u3400-\u4dbf]")
SECTION_RE = re.compile(r"^## (Q\d+)\.\s*.*$", re.MULTILINE)
SQL_BLOCK_RE = re.compile(r"```sql\s*\n(.*?)```", re.DOTALL)
RATING_RE = re.compile(r"\*\*评分:\s*(\d+)/10")


def has_cjk(s: str) -> bool:
    return bool(CJK_RE.search(s))


def parse_questions(text: str) -> tuple[str, str]:
    """Split body after '### 问题' into English vs Chinese lines."""
    lines = [ln.strip() for ln in text.splitlines() if ln.strip()]
    en_parts: list[str] = []
    zh_parts: list[str] = []
    for ln in lines:
        if has_cjk(ln):
            zh_parts.append(ln)
        else:
            en_parts.append(ln)
    return (" ".join(en_parts).strip(), " ".join(zh_parts).strip())


def dedupe_sql_blocks(blocks: list[str]) -> list[str]:
    out: list[str] = []
    seen: set[str] = set()
    for b in blocks:
        key = b.strip()
        if key in seen:
            continue
        seen.add(key)
        out.append(b.rstrip())
    return out


def extract_sql_blocks(region: str) -> list[str]:
    blocks = [m.group(1).strip() for m in SQL_BLOCK_RE.finditer(region)]
    return dedupe_sql_blocks(blocks)


def reorder_row(d: dict) -> dict:
    return {k: d[k] for k in JSONL_KEY_ORDER}


def parse_block(qid: str, body: str, ref: dict) -> dict:
    ap = body.find("\n## 附录")
    if ap != -1:
        body = body[:ap].rstrip()

    # --- 问题 ---
    m_q = re.search(r"### 问题\s*\n(.*?)(?=\n### 查询SQL\s)", body, re.DOTALL)
    if not m_q:
        raise ValueError(f"{qid}: missing ### 问题")
    question_en, question_zh = parse_questions(m_q.group(1))
    if not question_en and question_zh:
        if qid == "Q50":
            question_en = "List all client trade records for today."
        else:
            question_en = ref.get("question_en") or ""

    # --- SQL + result_note ---
    m_sql_hdr = re.search(r"### 查询SQL\s*\n", body)
    if not m_sql_hdr:
        raise ValueError(f"{qid}: missing ### 查询SQL")
    tail = body[m_sql_hdr.end() :]
    idx_exec = tail.find("### SQL执行结果")
    idx_reason = tail.find("### SQL理由")

    if idx_exec != -1 and (idx_reason == -1 or idx_exec < idx_reason):
        sql_region = tail[:idx_exec]
        chunk = tail[idx_exec:idx_reason] if idx_reason != -1 else tail[idx_exec:]
        result_note = re.sub(
            r"^### SQL执行结果\s*",
            "",
            chunk,
            count=1,
            flags=re.MULTILINE,
        ).strip()
    elif idx_reason != -1:
        sql_region = tail[:idx_reason]
        last_end = 0
        for m in SQL_BLOCK_RE.finditer(sql_region):
            last_end = m.end()
        result_note = sql_region[last_end:].strip() if last_end else ""
    else:
        raise ValueError(f"{qid}: no ### SQL理由 / ### SQL执行结果")

    sql_parts = extract_sql_blocks(sql_region)
    sql = "\n\n".join(sql_parts) if sql_parts else ref.get("sql", "")

    # --- explanation & rating ---
    m_reason = re.search(r"### SQL理由\s*\n(.*?)(?=\n### SQL准确度评分\s|\Z)", body, re.DOTALL)
    explanation = ""
    if m_reason:
        explanation = "\n".join(
            ln.rstrip() for ln in m_reason.group(1).splitlines() if ln.strip().startswith("-")
        ).strip()

    m_rating = RATING_RE.search(body)
    rating = int(m_rating.group(1)) if m_rating else ref.get("rating")

    base = dict(ref)
    base.update(
        {
            "qid": qid,
            "question_zh": question_zh or ref.get("question_zh") or "",
            "question_en": question_en,
            "sql": sql,
            "explanation": explanation if explanation else (ref.get("explanation") or ""),
            "rating": rating,
            "execution_result": None,
            "result_note": result_note.strip() if result_note else (ref.get("result_note") or ""),
        }
    )
    return reorder_row(base)


def main() -> None:
    md = MD_PATH.read_text(encoding="utf-8")
    refs: dict[str, dict] = {}
    with REF_JSONL.open(encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            obj = json.loads(line)
            refs[obj["qid"]] = obj

    matches = list(SECTION_RE.finditer(md))
    rows: list[dict] = []
    for i, m in enumerate(matches):
        qid = m.group(1)
        start = m.end()
        end = matches[i + 1].start() if i + 1 < len(matches) else len(md)
        body = md[start:end]
        ref = refs.get(qid, {})
        row = parse_block(qid, body, ref)
        rows.append(row)

    if len(rows) != 50:
        raise SystemExit(f"expected 50 sections, got {len(rows)}")

    OUT_PATH.parent.mkdir(parents=True, exist_ok=True)
    with OUT_PATH.open("w", encoding="utf-8", newline="\n") as out:
        for row in rows:
            out.write(json.dumps(row, ensure_ascii=False) + "\n")

    print(f"Wrote {OUT_PATH} ({len(rows)} lines)")


if __name__ == "__main__":
    main()