"""教师画像 / 指南赛道 / 推荐报告 的维护与查询。"""

from __future__ import annotations

import json
from typing import Any, Optional

from db.connection import get_conn, init_db
from service.match_service import _norm_teacher, _norm_track, _to_int
from util.logging_config import get_skill_logger
from util.timeutil import now_unix

_TEACHER_TEXT_FIELDS = ("teacher_name", "department", "title", "research_tags", "recent_papers", "project_history")
_TEACHER_INT_FIELDS = ("sci_q1_count", "core_paper_count")
_TRACK_TEXT_FIELDS = ("agency", "program_name", "track_name", "track_tags", "priority_keywords", "min_title", "source_doc")
_TRACK_INT_FIELDS = ("year", "min_sci_q1", "quota")

_KNOWN_MIN_TITLES = ("讲师及以上", "副高及以上", "正高及以上")


def _log():
    try:
        return get_skill_logger()
    except RuntimeError:
        return None


def _snake(name: str) -> str:
    return "".join("_" + ch.lower() if ch.isupper() else ch for ch in str(name)).lstrip("_")


def upsert_teacher(fields: dict[str, Any]) -> dict[str, Any]:
    """按姓名幂等写入教师画像；未提供字段不覆盖。"""
    teacher_name = str(fields.get("teacher_name") or "").strip()
    if not teacher_name:
        raise ValueError("教师姓名（teacher_name）不能为空")
    values: dict[str, Any] = {"teacher_name": teacher_name}
    for key in _TEACHER_TEXT_FIELDS:
        if key != "teacher_name" and fields.get(key) not in (None, ""):
            values[key] = str(fields[key]).strip()
    for key in _TEACHER_INT_FIELDS:
        if fields.get(key) not in (None, ""):
            number = _to_int(fields[key])
            if number is None or number < 0:
                raise ValueError(f"字段 {key} 必须是非负整数：{fields[key]}")
            values[key] = number

    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute("SELECT id FROM teacher_profiles WHERE teacher_name = ?", (teacher_name,))
        row = cur.fetchone()
        if row:
            teacher_id = int(row[0])
            set_clause = ", ".join(f"{k} = ?" for k in values if k != "teacher_name")
            cur.execute(
                f"UPDATE teacher_profiles SET {set_clause}, updated_at = ? WHERE id = ?",
                [values[k] for k in values if k != "teacher_name"] + [now_unix(), teacher_id],
            )
            action = "updated"
        else:
            columns = ", ".join(values.keys())
            placeholders = ", ".join("?" for _ in values)
            cur.execute(
                f"INSERT INTO teacher_profiles ({columns}, created_at, updated_at) VALUES ({placeholders}, ?, ?)",
                list(values.values()) + [now_unix(), now_unix()],
            )
            teacher_id = int(cur.lastrowid)
            action = "created"
        conn.commit()
    finally:
        conn.close()
    log = _log()
    if log:
        log.info("teacher_upserted teacher=%s action=%s stage=profile", teacher_name, action)
    return {"ok": True, "teacher_name": teacher_name, "id": teacher_id, "action": action}


def upsert_track(fields: dict[str, Any]) -> dict[str, Any]:
    """按（年度+学部+项目类型+赛道名）幂等写入指南赛道。"""
    year = _to_int(fields.get("year"))
    track_name = str(fields.get("track_name") or "").strip()
    if year is None or year < 2020 or year > 2100:
        raise ValueError(f"指南年度无效：{fields.get('year')}")
    if not track_name:
        raise ValueError("赛道名称（track_name）不能为空")
    if fields.get("min_title") and str(fields["min_title"]).strip() not in _KNOWN_MIN_TITLES:
        raise ValueError(f"职称门槛只接受 {'、'.join(_KNOWN_MIN_TITLES)}：{fields['min_title']}")
    values: dict[str, Any] = {"year": year, "track_name": track_name}
    for key in _TRACK_TEXT_FIELDS:
        if key not in ("track_name",) and fields.get(key) not in (None, ""):
            values[key] = str(fields[key]).strip()
    for key in ("min_sci_q1", "quota"):
        if fields.get(key) not in (None, ""):
            number = _to_int(fields[key])
            if number is None or number < 0:
                raise ValueError(f"字段 {key} 必须是非负整数：{fields[key]}")
            values[key] = number

    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute(
            "SELECT id FROM guide_tracks WHERE year = ? AND COALESCE(agency,'') = ? AND COALESCE(program_name,'') = ? AND track_name = ?",
            (year, values.get("agency", ""), values.get("program_name", ""), track_name),
        )
        row = cur.fetchone()
        if row:
            track_id = int(row[0])
            set_clause = ", ".join(f"{k} = ?" for k in values if k != "track_name")
            cur.execute(
                f"UPDATE guide_tracks SET {set_clause}, updated_at = ? WHERE id = ?",
                [values[k] for k in values if k != "track_name"] + [now_unix(), track_id],
            )
            action = "updated"
        else:
            columns = ", ".join(values.keys())
            placeholders = ", ".join("?" for _ in values)
            cur.execute(
                f"INSERT INTO guide_tracks ({columns}, created_at, updated_at) VALUES ({placeholders}, ?, ?)",
                list(values.values()) + [now_unix(), now_unix()],
            )
            track_id = int(cur.lastrowid)
            action = "created"
        conn.commit()
    finally:
        conn.close()
    log = _log()
    if log:
        log.info("track_upserted year=%s track=%s action=%s stage=track", year, track_name, action)
    return {"ok": True, "year": year, "track_name": track_name, "id": track_id, "action": action}


def _import_generic(rows: Any, upsert, label: str) -> dict[str, Any]:
    if not isinstance(rows, list) or not rows:
        raise ValueError(f"导入内容应为非空 JSON 数组（{label}）")
    if len(rows) > 500:
        raise ValueError(f"单次导入条数过多（{len(rows)}），上限 500 条")
    results = []
    for idx, raw in enumerate(rows):
        if not isinstance(raw, dict):
            raise ValueError(f"第 {idx + 1} 条不是 JSON 对象")
        results.append(upsert(raw))
    return {
        "ok": True,
        "count": len(results),
        "created": sum(1 for r in results if r["action"] == "created"),
        "updated": sum(1 for r in results if r["action"] == "updated"),
        "items": results,
    }


def import_teachers(rows: list[dict[str, Any]]) -> dict[str, Any]:
    """批量导入教师画像。"""
    return _import_generic(rows, lambda row: upsert_teacher({_snake(k): v for k, v in _norm_teacher(row).items()}), "教师画像")


def import_tracks(rows: list[dict[str, Any]]) -> dict[str, Any]:
    """批量导入指南赛道。"""
    return _import_generic(rows, lambda row: upsert_track({_snake(k): v for k, v in _norm_track(row).items()}), "指南赛道")


def list_teachers(department: str = "") -> list[dict[str, Any]]:
    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        if department:
            cur.execute("SELECT * FROM teacher_profiles WHERE department LIKE ? ORDER BY id", (f"%{department}%",))
        else:
            cur.execute("SELECT * FROM teacher_profiles ORDER BY id")
        columns = [d[0] for d in cur.description]
        rows = [dict(zip(columns, row)) for row in cur.fetchall()]
    finally:
        conn.close()
    return rows


def list_tracks(year: Optional[int] = None) -> list[dict[str, Any]]:
    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        if year:
            cur.execute("SELECT * FROM guide_tracks WHERE year = ? ORDER BY id", (year,))
        else:
            cur.execute("SELECT * FROM guide_tracks ORDER BY year DESC, id")
        columns = [d[0] for d in cur.description]
        rows = [dict(zip(columns, row)) for row in cur.fetchall()]
    finally:
        conn.close()
    return rows


def list_reports(limit: int = 20, tier: str = "") -> list[dict[str, Any]]:
    init_db()
    limit = max(1, min(int(limit), 200))
    conn = get_conn()
    try:
        cur = conn.cursor()
        if tier:
            cur.execute(
                "SELECT id, batch_no, season, teacher_name, department, eligible_count, top_json, report_file, created_at FROM match_reports WHERE top_json LIKE ? ORDER BY id DESC LIMIT ?",
                (f"%{tier}%", limit),
            )
        else:
            cur.execute(
                "SELECT id, batch_no, season, teacher_name, department, eligible_count, top_json, report_file, created_at FROM match_reports ORDER BY id DESC LIMIT ?",
                (limit,),
            )
        columns = [d[0] for d in cur.description]
        rows = [dict(zip(columns, row)) for row in cur.fetchall()]
    finally:
        conn.close()
    return rows


def get_report(report_id: int) -> dict[str, Any]:
    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute("SELECT * FROM match_reports WHERE id = ?", (report_id,))
        row = cur.fetchone()
        if not row:
            raise ValueError(f"推荐报告不存在：{report_id}")
        columns = [d[0] for d in cur.description]
        report = dict(zip(columns, row))
    finally:
        conn.close()
    for key in ("top_json", "tiers_json", "excluded_json"):
        try:
            report[key] = json.loads(report.get(key) or "[]")
        except (TypeError, ValueError):
            report[key] = []
    return report


def stats() -> dict[str, Any]:
    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute("SELECT COUNT(*) FROM teacher_profiles")
        teacher_total = int(cur.fetchone()[0])
        cur.execute("SELECT year, COUNT(*) FROM guide_tracks GROUP BY year ORDER BY year DESC")
        tracks_by_year = {str(r[0]): int(r[1]) for r in cur.fetchall()}
        cur.execute("SELECT COUNT(*) FROM match_reports")
        report_total = int(cur.fetchone()[0])
        cur.execute(
            "SELECT teacher_name, season, top_json FROM match_reports ORDER BY id DESC LIMIT 50"
        )
        strong = []
        for teacher_name, season, top_json in cur.fetchall():
            try:
                top = json.loads(top_json or "[]")
            except (TypeError, ValueError):
                top = []
            if top and top[0].get("tier") == "强烈推荐":
                strong.append({"teacher_name": teacher_name, "season": season, "top_track": top[0]["track"], "match_pct": top[0]["match_pct"]})
        strong = strong[:5]
    finally:
        conn.close()
    return {
        "ok": True,
        "teacher_total": teacher_total,
        "tracks_by_year": tracks_by_year,
        "report_total": report_total,
        "strong_top": strong,
    }