"""风控 Agent 的只读工具处理器。"""

from __future__ import annotations

from collections import Counter
from typing import Any

from app.core.contracts import RequestContext
from app.core.risk_contracts import RiskAlertEvidenceQuery, RiskAlertQuery
from app.infrastructure.db import SessionFactory
from app.repository.fund_query_repository import PageRequest
from app.repository.risk_repository import RiskRepository
from app.service.risk_judgement_service import (
    assess_alert_detail,
    assess_alert_list_item,
)
from app.service.risk_query_service import scope_from_context


async def search_risk_alerts_tool(
    arguments: RiskAlertQuery,
    context: RequestContext,
) -> dict[str, Any]:
    async with SessionFactory() as session:
        repository = RiskRepository(session, scope=scope_from_context(context))
        items: list[dict[str, Any]] = []
        offset = 0
        while True:
            page = await repository.list_alerts(
                customer_no=arguments.customer_no,
                product_code=arguments.product_code,
                product_name=arguments.product_name,
                risk_level=arguments.risk_level,
                rule_code=arguments.rule_code,
                start_time=arguments.start_time,
                end_time=arguments.end_time,
                page=PageRequest(limit=10, offset=offset),
            )
            for item in page.items:
                record = item.to_dict()
                record["disposition_hint"] = assess_alert_list_item(record)
                items.append(record)
            if page.next_offset is None:
                return build_alert_search_result(
                    items,
                    arguments.model_dump(mode="json", exclude_none=True),
                )
            offset = page.next_offset


def build_alert_search_result(
    items: list[dict[str, Any]],
    filters: dict[str, Any] | None = None,
) -> dict[str, Any]:
    """构建完整分组汇总和精简预警明细。"""
    compact_items = [_compact_alert_item(item) for item in items]
    rule_counts: Counter[str] = Counter()
    disposition_counts: Counter[str] = Counter()
    for item in compact_items:
        rule_counts.update(item.get("rule_codes") or ())
        hint = item.get("disposition_hint") or {}
        if isinstance(hint, dict) and hint.get("verdict"):
            disposition_counts[str(hint["verdict"])] += 1
    return {
        "total": len(compact_items),
        "filters": filters or {},
        "summary": {
            "customer_groups": _customer_groups(compact_items),
            "product_groups": _product_groups(compact_items),
            "risk_level_counts": dict(sorted(Counter(
                str(item.get("risk_level") or "未知")
                for item in compact_items
            ).items())),
            "rule_counts": dict(sorted(rule_counts.items())),
            "disposition_counts": dict(sorted(disposition_counts.items())),
            "complete": True,
        },
        "items": compact_items,
    }


def _compact_alert_item(item: dict[str, Any]) -> dict[str, Any]:
    fields = (
        "alert_no",
        "customer_no",
        "customer_name",
        "product_code",
        "product_name",
        "alert_type",
        "risk_level",
        "rule_codes",
        "evidence_summary",
        "status",
        "event_status",
        "created_at",
        "disposition_hint",
    )
    return {field: item.get(field) for field in fields if field in item}


def _customer_groups(items: list[dict[str, Any]]) -> list[dict[str, Any]]:
    groups: dict[str, dict[str, Any]] = {}
    for item in items:
        customer_no = item.get("customer_no")
        if not customer_no:
            continue
        key = str(customer_no)
        group = groups.setdefault(
            key,
            {
                "customer_no": key,
                "customer_name": item.get("customer_name"),
                "alert_count": 0,
                "risk_levels": set(),
            },
        )
        group["alert_count"] += 1
        if item.get("risk_level"):
            group["risk_levels"].add(str(item["risk_level"]))
    return [
        {
            **group,
            "risk_levels": sorted(group["risk_levels"]),
        }
        for group in sorted(
            groups.values(),
            key=lambda value: (-value["alert_count"], value["customer_no"]),
        )
    ]


def _product_groups(items: list[dict[str, Any]]) -> list[dict[str, Any]]:
    groups: dict[str, dict[str, Any]] = {}
    for item in items:
        product_code = item.get("product_code")
        product_name = item.get("product_name")
        key = str(product_code or product_name or "")
        if not key:
            continue
        group = groups.setdefault(
            key,
            {
                "product_code": product_code,
                "product_name": product_name,
                "alert_count": 0,
                "risk_levels": set(),
            },
        )
        group["alert_count"] += 1
        if item.get("risk_level"):
            group["risk_levels"].add(str(item["risk_level"]))
    return [
        {
            **group,
            "risk_levels": sorted(group["risk_levels"]),
        }
        for group in sorted(
            groups.values(),
            key=lambda value: (
                -value["alert_count"],
                str(value["product_code"] or value["product_name"]),
            ),
        )
    ]


async def get_risk_overview_tool(
    arguments: RiskAlertQuery,
    context: RequestContext,
) -> dict[str, Any]:
    del arguments
    async with SessionFactory() as session:
        return await RiskRepository(session, scope=scope_from_context(context)).overview()


async def get_alert_evidence_tool(
    arguments: RiskAlertEvidenceQuery,
    context: RequestContext,
) -> dict[str, Any] | None:
    async with SessionFactory() as session:
        record = await RiskRepository(
            session,
            scope=scope_from_context(context),
        ).get_alert_detail(arguments.alert_no)
        if record is None:
            return None
        detail = record.to_dict()
        detail["disposition_assessment"] = assess_alert_detail(detail)
        return detail