"""结题项目 / 成果清单 / 决算明细 / 初稿记录 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.draft_service import _norm_achievement, _norm_expense, _norm_project
from util.logging_config import get_skill_logger
from util.timeutil import now_unix

_PROJECT_TEXT_FIELDS = ("project_name", "pi_name", "department", "program", "start_date", "end_date", "annual_report_excerpt", "status")
_KNOWN_STATUS = ("待结题", "初稿已生成", "已提交")
_KNOWN_ACH_TYPES = ("论文", "专利", "人才培养", "其他")


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 _to_float(value: Any) -> Optional[float]:
    if value is None or value == "":
        return None
    try:
        return float(value)
    except (TypeError, ValueError):
        return None


def upsert_project(fields: dict[str, Any]) -> dict[str, Any]:
    fields = {_snake(k): v for k, v in _norm_project(fields).items()}
    project_no = str(fields.get("project_no") or "").strip()
    if not project_no:
        raise ValueError("项目编号（project_no）不能为空")
    values: dict[str, Any] = {"project_no": project_no}
    for key in _PROJECT_TEXT_FIELDS:
        if fields.get(key) not in (None, ""):
            values[key] = str(fields[key]).strip()
    if values.get("status") and values["status"] not in _KNOWN_STATUS:
        raise ValueError(f"status 只接受 {'、'.join(_KNOWN_STATUS)}：{values['status']}")
    if fields.get("approved_budget") not in (None, ""):
        approved = _to_float(fields.get("approved_budget"))
        if approved is None or approved < 0:
            raise ValueError(f"立项经费必须是非负数字（元）：{fields.get('approved_budget')}")
        values["approved_budget"] = round(approved, 2)
    if fields.get("expected_json") not in (None, ""):
        raw = fields["expected_json"]
        try:
            expected = json.loads(raw) if isinstance(raw, str) else raw
        except (TypeError, ValueError) as exc:
            raise ValueError(f"预期指标 JSON 解析失败：{exc}") from exc
        if not isinstance(expected, list):
            raise ValueError("预期指标应为数组，如 [{\"type\":\"论文\",\"target\":3,\"unit\":\"篇\"}]")
        values["expected_json"] = json.dumps(expected, ensure_ascii=False)

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


def upsert_achievement(fields: dict[str, Any]) -> dict[str, Any]:
    achievement = {_snake(k): v for k, v in _norm_achievement(fields).items()}
    project_no = str(achievement.get("project_no") or "").strip()
    title = str(achievement.get("title") or "").strip()
    ach_type = str(achievement.get("achievement_type") or "").strip()
    if not project_no:
        raise ValueError("项目编号（project_no）不能为空")
    if not ach_type:
        raise ValueError("成果类型（achievement_type）不能为空")
    if ach_type not in _KNOWN_ACH_TYPES:
        raise ValueError(f"成果类型只接受 {'、'.join(_KNOWN_ACH_TYPES)}：{ach_type}")
    if not title:
        raise ValueError("成果名称（title）不能为空")

    values = {
        "project_no": project_no,
        "achievement_type": ach_type,
        "title": title,
        "venue_or_no": str(achievement.get("venue_or_no") or "").strip(),
        "ach_date": str(achievement.get("ach_date") or "").strip(),
        "is_representative": 1 if str(achievement.get("is_representative") or "").strip() in ("1", "true", "True", "是") else 0,
        "note": str(achievement.get("note") or "").strip(),
    }
    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute("SELECT id FROM closing_projects WHERE project_no = ?", (project_no,))
        if not cur.fetchone():
            raise ValueError(f"项目不存在，请先录入结题项目：{project_no}")
        cur.execute(
            """
            INSERT INTO achievements
                (project_no, achievement_type, title, venue_or_no, ach_date, is_representative, note, created_at, updated_at)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
            """,
            list(values.values()) + [now_unix(), now_unix()],
        )
        achievement_id = int(cur.lastrowid)
        conn.commit()
    finally:
        conn.close()
    log = _log()
    if log:
        log.info("achievement_added project_no=%s type=%s stage=ledger", project_no, ach_type)
    return {"ok": True, "id": achievement_id, "project_no": project_no, "title": title}


def upsert_expense(fields: dict[str, Any]) -> dict[str, Any]:
    expense = {_snake(k): v for k, v in _norm_expense(fields).items()}
    project_no = str(expense.get("project_no") or "").strip()
    category = str(expense.get("category") or "").strip()
    amount = _to_float(expense.get("amount"))
    if not project_no:
        raise ValueError("项目编号（project_no）不能为空")
    if not category:
        raise ValueError("科目（category）不能为空")
    if amount is None or amount < 0:
        raise ValueError(f"金额必须是非负数字：{fields.get('amount')}")

    values = {
        "project_no": project_no,
        "category": category,
        "amount": round(amount, 2),
        "occurred_date": str(expense.get("occurred_date") or "").strip(),
        "description": str(expense.get("description") or "").strip(),
    }
    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute("SELECT id FROM closing_projects WHERE project_no = ?", (project_no,))
        if not cur.fetchone():
            raise ValueError(f"项目不存在，请先录入结题项目：{project_no}")
        cur.execute(
            """
            INSERT INTO expense_items
                (project_no, category, amount, occurred_date, description, created_at, updated_at)
            VALUES (?, ?, ?, ?, ?, ?, ?)
            """,
            list(values.values()) + [now_unix(), now_unix()],
        )
        expense_id = int(cur.lastrowid)
        conn.commit()
    finally:
        conn.close()
    log = _log()
    if log:
        log.info("expense_added project_no=%s category=%s stage=ledger", project_no, category)
    return {"ok": True, "id": expense_id, "project_no": project_no, "category": category, "amount": values["amount"]}


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_projects(rows: list[dict[str, Any]]) -> dict[str, Any]:
    return _import_generic(rows, lambda row: upsert_project({_snake(k): v for k, v in _norm_project(row).items()}), "结题项目")


def import_achievements(rows: list[dict[str, Any]]) -> dict[str, Any]:
    return _import_generic(rows, lambda row: upsert_achievement({_snake(k): v for k, v in _norm_achievement(row).items()}), "成果清单")


def import_expenses(rows: list[dict[str, Any]]) -> dict[str, Any]:
    return _import_generic(rows, lambda row: upsert_expense({_snake(k): v for k, v in _norm_expense(row).items()}), "决算明细")


def list_projects(status: str = "") -> list[dict[str, Any]]:
    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        if status:
            cur.execute("SELECT * FROM closing_projects WHERE status = ? ORDER BY id", (status,))
        else:
            cur.execute("SELECT * FROM closing_projects 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_achievements(project_no: str) -> list[dict[str, Any]]:
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute("SELECT * FROM achievements WHERE project_no = ? ORDER BY id", (project_no,))
        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_expenses(project_no: str) -> list[dict[str, Any]]:
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute("SELECT * FROM expense_items WHERE project_no = ? ORDER BY id", (project_no,))
        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_drafts(limit: int = 20) -> list[dict[str, Any]]:
    init_db()
    limit = max(1, min(int(limit), 200))
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute(
            "SELECT id, batch_no, project_no, project_name, draft_file, preview_file, created_at FROM report_drafts 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_draft(draft_id: int) -> dict[str, Any]:
    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute("SELECT * FROM report_drafts WHERE id = ?", (draft_id,))
        row = cur.fetchone()
        if not row:
            raise ValueError(f"初稿记录不存在：{draft_id}")
        columns = [d[0] for d in cur.description]
        draft = dict(zip(columns, row))
    finally:
        conn.close()
    for key in ("completion_json", "narrative_points_json"):
        try:
            draft[key[:-5]] = json.loads(draft.get(key) or "[]")
        except (TypeError, ValueError):
            draft[key[:-5]] = []
    return draft


def stats() -> dict[str, Any]:
    init_db()
    conn = get_conn()
    try:
        cur = conn.cursor()
        cur.execute("SELECT status, COUNT(*) FROM closing_projects GROUP BY status")
        by_status = {str(r[0]): int(r[1]) for r in cur.fetchall()}
        cur.execute("SELECT COUNT(*) FROM achievements")
        achievement_total = int(cur.fetchone()[0])
        cur.execute("SELECT COUNT(*) FROM expense_items")
        expense_total = int(cur.fetchone()[0])
        cur.execute("SELECT COUNT(*) FROM report_drafts")
        draft_total = int(cur.fetchone()[0])
    finally:
        conn.close()
    return {
        "ok": True,
        "projects_by_status": by_status,
        "achievement_total": achievement_total,
        "expense_total": expense_total,
        "draft_total": draft_total,
    }