"""受控工具集实现（AGENT.md §28）：Agent 只能调用这里的白名单工具。

全部工具经 Job/Experiment 链路或只读查询执行：
- 不提供 shell / 任意代码执行 / 修改配置与凭证 / 删除数据
- 任何研究都会产出 Experiment 归档（可复现）
"""

from __future__ import annotations

import json
from datetime import date

from app.agent.tools import Tool
from app.application.services.job_executor import default_factories, submit_and_run
from app.application.services.selection_service import SelectionService
from app.application.services.signal_service import SignalService
from app.domain.entities.composite import CompositeComponent, CompositeDefinition
from app.domain.entities.research import (
    BacktestResult,
    FactorTestReport,
    ResearchSpec,
    UniverseSpec,
)
from app.domain.entities.selection import SelectionQuery
from app.domain.entities.signal import SignalRules
from app.domain.entities.strategy import SelectionStrategy
from app.infrastructure.persistence.sqlalchemy.repositories.composite_impl import (
    SqlAlchemyCompositeRepository,
)
from app.infrastructure.persistence.sqlalchemy.repositories.factor_impl import (
    SqlAlchemyFactorRepository,
)
from app.infrastructure.persistence.sqlalchemy.repositories.selection_impl import (
    SqlAlchemySelectionRepository,
)
from app.infrastructure.persistence.sqlalchemy.repositories.strategy_impl import (
    SqlAlchemyStrategyRepository,
)
from app.quant.factors import FactorError, get_factor


def _day(text: str) -> date:
    return date.fromisoformat(text)


def _pick(mapping: dict, key: str, default=None):
    val = mapping.get(key, default)
    if isinstance(val, str):
        val = val.strip()
        if val == "":
            return default
    return val


def _job_result_json(job, *, session_factory, experiment_repo_factory) -> str | None:
    """取 Job 的完整结果 JSON。

    2026-09 起完整结果只在 experiment 存一份（`job.result_json` 为 None），故先按
    `job.experiment_id` 回读归档；归档不存在 / 老记录再回退 `job.result_json`。
    """
    if job.experiment_id:
        try:
            with session_factory() as session:
                exp = experiment_repo_factory(session).get(job.experiment_id)
            if exp is not None:
                return exp.result_json
        except Exception:  # noqa: BLE001 —— 回读失败则回退 job 副本，不阻断工具
            pass
    return job.result_json


def build_tools(factories: dict | None = None) -> list[Tool]:
    facts = factories or default_factories()
    session_factory = facts["session_factory"]
    stock_repo_f = facts["stock_repo_factory"]
    daily_repo_f = facts["daily_repo_factory"]
    exp_repo_f = facts["experiment_repo_factory"]

    def search_stocks(args: dict) -> str:
        q = str(_pick(args, "q", "") or "").upper()
        with session_factory() as session:
            stocks = stock_repo_f(session).list()
        rows = [
            s for s in stocks if (not q) or q in s.symbol.upper() or q in (s.name or "").upper()
        ][:15]
        if not rows:
            return "未找到匹配股票"
        return "\n".join(
            f"{s.symbol} {s.name} 行业={s.industry or '-'} 上市={s.list_date}" for s in rows
        )

    def get_market_data(args: dict) -> str:
        symbol = str(_pick(args, "symbol", "")).upper()
        start = _day(str(_pick(args, "start", "2024-01-01")))
        end = _day(str(_pick(args, "end", date.today().isoformat())))
        with session_factory() as session:
            bars = daily_repo_f(session).get_range(symbol, start, end)
        if not bars:
            return f"{symbol} 在 {start}~{end} 无日线数据（可能未同步）"
        head, tail = bars[0], bars[-1]
        last = "\n".join(f"{b.trade_date} close={b.close}" for b in bars[-8:])
        change = float(tail.close) / float(head.close) - 1 if head.close and tail.close else None
        return (
            f"{symbol} {start}~{end} 共 {len(bars)} 根日线；"
            f"区间 {head.trade_date}→{tail.trade_date} 收盘 {head.close}→{tail.close}"
            f"（涨跌 {change * 100:.2f}% 若数据完整）；最近 8 根：\n{last}"
        )

    def _run_spec(spec: ResearchSpec, desc: str) -> str:
        job = submit_and_run(spec, factories=facts)
        if job.status != "success":
            return f"{desc} 执行失败：{job.error}"
        result_json = _job_result_json(
            job, session_factory=session_factory, experiment_repo_factory=exp_repo_f
        )
        if spec.type == "backtest":
            result = BacktestResult.model_validate_json(result_json or "{}")
            s = result.summary
            return (
                f"回测完成（Experiment {job.experiment_id}，代码版本 {_code_version(job, exp_repo_f)}）。"
                f"总收益 {s.total_return_pct:.2f}%，年化 {s.annual_return_pct:.2f}%，"
                f"Sharpe {s.sharpe:.2f}，最大回撤 {s.max_drawdown_pct:.2f}%，"
                f"交易 {s.total_trades} 笔，平均换手 {s.avg_turnover_pct:.1f}%。"
                f"未建模约束 {len(result.unimplemented)} 项（成本/涨跌停近似见实验详情）。"
            )
        report = FactorTestReport.model_validate_json(result_json or "{}")
        qs = ", ".join(f"Q{q.quantile + 1}: {q.return_pct:.2f}%" for q in report.quantile_returns)
        return (
            f"因子测试完成（Experiment {job.experiment_id}）。IC {report.ic_mean:.4f}，"
            f"RankIC {report.rank_ic_mean:.4f}，ICIR {report.icir:.2f}，正收益占比 "
            f"{report.positive_ratio_pct:.1f}%，样本 {report.sample_days} 日；分层未来收益 {qs}。"
            f"注意：单因子测试不代表策略有效，需结合稳健性分析。"
        )

    def test_factor(args: dict) -> str:
        name = str(_pick(args, "name", ""))
        start = _day(str(_pick(args, "start", "2024-01-01")))
        end = _day(str(_pick(args, "end", "2024-12-31")))
        spec = ResearchSpec(
            type="factor_test",
            universe={"exclude_st": True, "min_listing_days": 0},
            factors=[{"name": name, "weight": 1.0}],
            selection={"top_n": 10},
            rebalance="monthly",
            period=(start, end),
        )
        return _run_spec(spec, f"因子 {name} 测试")

    def run_backtest(args: dict) -> str:
        factor_names = [f.strip() for f in str(_pick(args, "factors", "momentum_60")).split(",")]
        top_n = int(_pick(args, "top_n", 5) or 5)
        rebalance = str(_pick(args, "rebalance", "monthly"))
        exclude_st = bool(_pick(args, "exclude_st", True))
        start = _day(str(_pick(args, "start", "2024-01-01")))
        end = _day(str(_pick(args, "end", "2024-12-31")))
        spec = ResearchSpec(
            type="backtest",
            universe={"exclude_st": exclude_st, "min_listing_days": 0},
            factors=[{"name": n, "weight": 1.0} for n in factor_names],
            selection={"top_n": top_n},
            rebalance=rebalance,
            period=(start, end),
        )
        return _run_spec(spec, "回测")

    def get_experiment(args: dict) -> str:
        exp_id = str(_pick(args, "experiment_id", "")).upper()
        with session_factory() as session:
            exp = exp_repo_f(session).get(exp_id)
        if exp is None:
            return f"Experiment {exp_id} 不存在（可用列表：GET /api/experiments）"
        spec = json.loads(exp.spec_json)
        return (
            f"Experiment {exp.id} [{exp.kind}] 因子={[f['name'] for f in spec.get('factors', [])]} "
            f"区间={spec.get('period')} 调仓={spec.get('rebalance')}；摘要：{exp.summary_text or '-'} "
            f"代码版本={exp.code_version or '-'} 创建={exp.created_at}"
        )

    def compare_experiments(args: dict) -> str:
        ids = [
            x.strip().upper()
            for x in str(_pick(args, "experiment_ids", "")).split(",")
            if x.strip()
        ]
        if not ids:
            return "请提供 experiment_ids（逗号分隔）"
        with session_factory() as session:
            repo = exp_repo_f(session)
            rows = [(i, repo.get(i)) for i in ids]
        out = []
        for exp_id, exp in rows:
            if exp is None:
                out.append(f"{exp_id}: 不存在")
            else:
                spec = json.loads(exp.spec_json)
                out.append(
                    f"{exp.id}: 因子={[f['name'] for f in spec.get('factors', [])]} "
                    f"区间={spec.get('period')} → {exp.summary_text or '-'}"
                )
        return "\n".join(out)

    def _scope_symbols(raw: str | None) -> list[str]:
        """白名单（可选）：避免全市场长任务拖垮同步对话（全市场可用 Web 页异步）。"""
        if not raw:
            return []
        return [x.strip().upper() for x in raw.split(",") if x.strip()][:60]

    def screen_stocks(args: dict) -> str:
        factors = [x.strip() for x in str(_pick(args, "factors", "momentum_60")).split(",") if x.strip()]
        top_n = int(_pick(args, "top_n", 10) or 10)
        as_of = _day(str(_pick(args, "as_of", date.today().isoformat())))
        symbols = _scope_symbols(str(_pick(args, "symbols", "") or ""))
        if not symbols:
            return (
                "为避免全市场长任务（>1 分钟），请传 symbols 白名单（≤60，逗号分隔）"
                "或使用 Web 选股页执行全市场选股。"
            )
        query = SelectionQuery(
            universe=UniverseSpec(
                exclude_st=bool(_pick(args, "exclude_st", True)),
                min_listing_days=0,
                symbols=symbols,
            ),
            factors=[{"name": f, "weight": 1.0} for f in factors],
            top_n=top_n,
            as_of=as_of,
        )
        with session_factory() as session:
            service = SelectionService(
                stock_repo_f(session), daily_repo_f(session)
            )
            result = service.select(query)
        if not result.candidates:
            return (
                f"{as_of} 无候选（范围 {result.statistics.universe_size} 只，"
                f"可评分 {result.statistics.evaluated}）。如需白名单可传 symbols（≤60）。"
            )
        lines = [f"as_of={result.as_of_date} 选出 Top{len(result.candidates)}："]
        for c in result.candidates:
            vals = ", ".join(f"{k}={v:.4f}" for k, v in c.factor_values.items())
            lines.append(f"  #{c.rank} {c.symbol} score={c.score:.4f}（{vals}）")
        lines.append("入选理由见 explain_selection（selection_id）。")
        return "\n".join(lines)

    def explain_selection(args: dict) -> str:
        sel_id = str(_pick(args, "selection_id", "")).upper()
        with session_factory() as session:
            repo = SqlAlchemySelectionRepository(session)
            result = repo.get(sel_id)
        if result is None:
            return f"选股记录 {sel_id} 不存在（先通过 Web 选股页或 screen_stocks 生成）"
        out = [f"选股 {sel_id} as_of={result.as_of_date}（{result.method}，选出 {len(result.candidates)} 只）"]
        for c in result.candidates[:10]:
            reasons = "; ".join(c.selection_reason[:3])
            out.append(f"  #{c.rank} {c.symbol} score={c.score:.4f} — {reasons}")
        return "\n".join(out)

    def generate_signals(args: dict) -> str:
        factors = [x.strip() for x in str(_pick(args, "factors", "momentum_60")).split(",") if x.strip()]
        as_of = _day(str(_pick(args, "as_of", date.today().isoformat())))
        symbols = _scope_symbols(str(_pick(args, "symbols", "") or ""))
        query = SelectionQuery(
            universe=UniverseSpec(
                exclude_st=bool(_pick(args, "exclude_st", True)),
                min_listing_days=0,
                symbols=symbols,
            ),
            factors=[{"name": f, "weight": 1.0} for f in factors],
            top_n=int(_pick(args, "top_n", 50) or 50),
            as_of=as_of,
        )
        rules = SignalRules(
            buy_rank_threshold=int(_pick(args, "buy_rank", 20) or 20),
            sell_rank_threshold=int(_pick(args, "sell_rank", 50) or 50),
        )
        with session_factory() as session:
            res = SignalService(stock_repo_f(session), daily_repo_f(session)).signal(query, rules)
        out = [
            f"信号 as_of={res.as_of_date}: BUY {res.statistics.buy} / WATCH {res.statistics.watch} / "
            f"SELL {res.statistics.sell}（前 8 条）"
        ]
        for e in res.events[:8]:
            out.append(f"  {e.signal_type} {e.symbol} score={e.score:.4f} — {e.trigger_reason[0] if e.trigger_reason else ''}")
        return "\n".join(out)

    def create_strategy(args: dict) -> str:
        name = str(_pick(args, "name", ""))
        if not name:
            return "请提供 name"
        factors = [
            {"name": x.strip(), "weight": 1.0}
            for x in str(_pick(args, "factors", "momentum_60")).split(",")
            if x.strip()
        ]
        if not factors:
            return "请提供至少一个 factors（逗号分隔）"
        description = str(_pick(args, "description", "") or "")
        # 选股策略只存「选股条件组合」：股票池 + 因子（+ 可选条件）。
        # top_n / rebalance 等回测执行参数已移到「回测组合」，Agent 不再在此指定。
        st = SelectionStrategy(
            name=name,
            description=description,
            universe=UniverseSpec(
                exclude_st=bool(_pick(args, "exclude_st", True)), min_listing_days=0
            ),
            factors=factors,
        )
        from app.application.services.job_executor import new_id

        with session_factory() as session:
            saved = SqlAlchemyStrategyRepository(session).save(
                st.model_copy(update={"id": new_id("STG")})
            )
            session.commit()
        return f"策略已保存：{saved.id} {saved.name}（factors={[f.name for f in saved.factors]}）"

    def inspect_factor(args: dict) -> str:
        name = str(_pick(args, "name", ""))
        with session_factory() as session:
            row = SqlAlchemyFactorRepository(session).get(name)
        if row is None:
            return f"因子 {name} 不在目录（可用列表：GET /api/factors）"
        return (
            f"{row.name}：{row.description}\n公式：{row.formula}\n方向："
            f"{'越高越好' if row.direction == 'higher_is_better' else '越低越好'}"
            f"（lookback {row.lookback}，输入 {row.requires}）\n简介：{row.brief}"
        )

    def create_composite_factor(args: dict) -> str:
        name = str(_pick(args, "name", ""))
        raw = str(_pick(args, "factors", ""))
        if not name or not raw:
            return "请提供 name 与 factors（格式：momentum_60:0.7,volatility_60:0.3）"
        comps: list[CompositeComponent] = []
        for part in raw.split(","):
            if not part.strip():
                continue
            seg = part.strip().split(":")
            fname = seg[0].strip()
            weight = float(seg[1]) if len(seg) > 1 and seg[1].strip() else 1.0
            if not fname:
                continue
            try:
                defn, _fn = get_factor(fname)
            except FactorError as exc:
                return f"无法创建：{exc}"
            comps.append(CompositeComponent(name=fname, weight=weight, direction=defn.direction))
        if not comps:
            return "未解析到任何因子组件"
        from app.application.services.job_executor import new_id

        cf = CompositeDefinition(
            name=name, description=str(_pick(args, "description", "") or ""), components=comps
        )
        with session_factory() as session:
            saved = SqlAlchemyCompositeRepository(session).save(
                cf.model_copy(update={"id": new_id("CF")})
            )
            session.commit()
        return (
            f"组合已保存：{saved.id} {saved.name}（"
            + ", ".join(f"{c.name}:{c.weight}" for c in saved.components)
            + "）"
        )

    def get_backtest_result(args: dict) -> str:
        exp_id = str(_pick(args, "experiment_id", "")).upper()
        with session_factory() as session:
            exp = exp_repo_f(session).get(exp_id)
        if exp is None:
            return f"Experiment {exp_id} 不存在"
        try:
            result = BacktestResult.model_validate_json(exp.result_json)
        except Exception:  # noqa: BLE001
            return f"{exp_id} 不是回测结果"
        sm = result.summary
        return (
            f"回测 {exp_id} {sm.start}~{sm.end}：总收益 {sm.total_return_pct:.2f}%，"
            f"年化 {sm.annual_return_pct:.2f}%，Sharpe {sm.sharpe:.2f}，"
            f"最大回撤 {sm.max_drawdown_pct:.2f}%，期末 {sm.final_equity:,.0f} 元；"
            f"交易 {sm.total_trades} 笔胜率 {sm.win_rate_pct:.1f}%；"
            f"选股记录 {len(result.selection_history)} / 信号 {len(result.signal_history)} / "
            f"成交 {len(result.fills)}；未建模 {len(result.unimplemented)} 项"
        )

    def create_experiment(args: dict) -> str:
        """把成功 Job 兜底归档为 Experiment（研究工具已自动归档；本工具用于补档）。"""
        job_id = str(_pick(args, "job_id", "")).upper()
        if not job_id:
            return "请提供 job_id"
        from app.application.services.job_executor import new_id
        from app.domain.entities.research import ExperimentRecord
        from app.infrastructure.persistence.sqlalchemy.repositories.jobs_impl import (
            SqlAlchemyJobRepository,
        )

        with session_factory() as session:
            job = SqlAlchemyJobRepository(session).get(job_id)
            if job is None:
                return f"Job {job_id} 不存在"
            # 顺序要紧：新形态记录结果只在 experiment 侧（job.result_json 为 None），
            # 先判「已归档」，否则成功 Job 会被误判为「无结果可归档」
            if job.experiment_id:
                return f"Job {job_id} 已归档为 {job.experiment_id}"
            if job.status != "success" or not job.result_json:
                return f"Job {job_id} 未成功（无结果可归档）"
            # 走到这里必然是老形态记录（结果仍在 job 侧，无 experiment 关联）
            result_json = job.result_json
            exp_repo = exp_repo_f(session)
            summary = None
            try:
                if job.kind == "backtest":
                    r = BacktestResult.model_validate_json(result_json)
                    summary = (
                        f"总收益 {r.summary.total_return_pct:.2f}% · 年化 "
                        f"{r.summary.annual_return_pct:.2f}% · 回撤 {r.summary.max_drawdown_pct:.2f}%"
                    )
            except Exception:  # noqa: BLE001
                pass
            exp = ExperimentRecord(
                id=new_id("EXP"),
                kind=job.kind,
                spec_json=job.spec_json,
                result_json=result_json,
                summary_text=summary,
                job_id=job.id,
                created_at=job.created_at,
            )
            exp_repo.save(exp)
            job.experiment_id = exp.id
            SqlAlchemyJobRepository(session).update(job)
            session.commit()
        return f"已归档：{exp.id}（Job {job_id} → Experiment）"

    return [
        Tool(
            "search_stocks",
            "按代码或名称搜索股票，返回基础信息（只读）",
            {
                "type": "object",
                "properties": {"q": {"type": "string", "description": "代码或名称关键字"}},
            },
            search_stocks,
        ),
        Tool(
            "get_market_data",
            "读取一只股票一段区间的日线行情摘要（只读，不复权）",
            {
                "type": "object",
                "properties": {
                    "symbol": {"type": "string", "description": "如 600519.SH"},
                    "start": {"type": "string", "description": "YYYY-MM-DD"},
                    "end": {"type": "string", "description": "YYYY-MM-DD"},
                },
                "required": ["symbol"],
            },
            get_market_data,
        ),
        Tool(
            "test_factor",
            "对单个因子做 IC/RankIC/分层测试并归档 Experiment",
            {
                "type": "object",
                "properties": {
                    "name": {
                        "type": "string",
                        "description": "因子名（momentum_60 / volatility_20 等）",
                    },
                    "start": {"type": "string"},
                    "end": {"type": "string"},
                },
                "required": ["name"],
            },
            test_factor,
        ),
        Tool(
            "run_backtest",
            "运行 TopK 低频回测并归档 Experiment（成本/涨跌停近似建模）",
            {
                "type": "object",
                "properties": {
                    "factors": {"type": "string", "description": "逗号分隔的因子名"},
                    "top_n": {"type": "integer"},
                    "rebalance": {"type": "string", "enum": ["monthly", "weekly"]},
                    "exclude_st": {"type": "boolean"},
                    "start": {"type": "string"},
                    "end": {"type": "string"},
                },
            },
            run_backtest,
        ),
        Tool(
            "get_experiment",
            "读取已归档实验的摘要",
            {
                "type": "object",
                "properties": {"experiment_id": {"type": "string"}},
                "required": ["experiment_id"],
            },
            get_experiment,
        ),
        Tool(
            "compare_experiments",
            "对比多个实验（因子/区间/收益摘要）",
            {
                "type": "object",
                "properties": {"experiment_ids": {"type": "string"}},
                "required": ["experiment_ids"],
            },
            compare_experiments,
        ),
        Tool(
            "screen_stocks",
            "按因子评分筛选股票（TopN；传 symbols 白名单避免全市场长任务）",
            {
                "type": "object",
                "properties": {
                    "factors": {"type": "string", "description": "逗号分隔因子名"},
                    "top_n": {"type": "integer"},
                    "as_of": {"type": "string", "description": "YYYY-MM-DD"},
                    "symbols": {"type": "string", "description": "逗号分隔白名单（可选，≤60）"},
                },
            },
            screen_stocks,
        ),
        Tool(
            "explain_selection",
            "解释一次选股结果：为什么选这些股票（含因子值与理由）",
            {
                "type": "object",
                "properties": {"selection_id": {"type": "string"}},
                "required": ["selection_id"],
            },
            explain_selection,
        ),
        Tool(
            "generate_signals",
            "基于选股评分+趋势生成 BUY/WATCH/SELL 信号",
            {
                "type": "object",
                "properties": {
                    "factors": {"type": "string"},
                    "as_of": {"type": "string"},
                    "symbols": {"type": "string", "description": "白名单（可选）"},
                    "buy_rank": {"type": "integer"},
                    "sell_rank": {"type": "integer"},
                },
            },
            generate_signals,
        ),
        Tool(
            "create_strategy",
            "创建/保存一个命名策略（可随后展开为回测）",
            {
                "type": "object",
                "properties": {
                    "name": {"type": "string"},
                    "description": {"type": "string"},
                    "factors": {"type": "string"},
                    "top_n": {"type": "integer"},
                    "rebalance": {"type": "string", "enum": ["monthly", "weekly"]},
                },
                "required": ["name", "factors"],
            },
            create_strategy,
        ),
        Tool(
            "inspect_factor",
            "查看因子目录元数据（公式/方向/lookback/输入列）",
            {
                "type": "object",
                "properties": {"name": {"type": "string"}},
                "required": ["name"],
            },
            inspect_factor,
        ),
        Tool(
            "create_composite_factor",
            "创建并保存多因子组合（factors 格式：momentum_60:0.7,volatility_60:0.3）",
            {
                "type": "object",
                "properties": {
                    "name": {"type": "string"},
                    "factors": {"type": "string"},
                    "description": {"type": "string"},
                },
                "required": ["name", "factors"],
            },
            create_composite_factor,
        ),
        Tool(
            "get_backtest_result",
            "读取回测 Experiment 的详细结果（收益/回撤/交易/意图与成交统计）",
            {
                "type": "object",
                "properties": {"experiment_id": {"type": "string"}},
                "required": ["experiment_id"],
            },
            get_backtest_result,
        ),
        Tool(
            "create_experiment",
            "把成功 Job 兜底归档为 Experiment（补档；研究工具已自动归档）",
            {
                "type": "object",
                "properties": {"job_id": {"type": "string"}},
                "required": ["job_id"],
            },
            create_experiment,
        ),
    ]

def _code_version(job, exp_repo_f) -> str:
    try:
        with default_factories()["session_factory"]() as session:
            exp = exp_repo_f(session).get(job.experiment_id or "")
            return exp.code_version or "-" if exp else "-"
    except Exception:  # noqa: BLE001
        return "-"