from __future__ import annotations

from typing import Any

from app.core.agent_enums import AgentPermissionLevel
from app.schemas.ontology import (
    OntologyConstraint,
    OntologyEntity,
    OntologyFieldError,
    OntologyMetric,
    OntologyPermission,
    OntologyTimeRange,
)
from app.services.ontology_rules import (
    EXPENSE_REVIEW_ACTIONS,
    MISSING_SLOT_LABELS,
    OPERATE_KEYWORDS,
    PRIVILEGED_ROLE_CODES,
)


class OntologyValidationMixin:
    def _extract_risk_flags(self, compact_query: str, scenario: str) -> list[str]:
        risk_flags: list[str] = []

        def append(flag: str) -> None:
            if flag not in risk_flags:
                risk_flags.append(flag)

        if "重复" in compact_query:
            append("duplicate_expense")
        if any(
            keyword in compact_query
            for keyword in ("发票异常", "票据异常", "验真失败", "附件缺失", "补件")
        ):
            append("invoice_anomaly")
        if any(keyword in compact_query for keyword in ("超标", "超预算", "超限")):
            append("amount_over_limit")
        if scenario == "budget" and any(
            keyword in compact_query for keyword in ("预算不足", "超预算", "超支")
        ):
            append("budget_over_limit")
        if scenario == "budget" and any(
            keyword in compact_query for keyword in ("预算预警", "触发预警", "接近预算")
        ):
            append("budget_warning")
        if scenario == "accounts_receivable" and any(
            keyword in compact_query for keyword in ("逾期", "账龄", "欠款", "未回款")
        ):
            append("ar_overdue")
        if scenario == "accounts_payable" and any(
            keyword in compact_query for keyword in ("逾期", "待付", "付款风险", "未付款")
        ):
            append("ap_overdue")

        return risk_flags

    def _resolve_permission(
        self,
        compact_query: str,
        context_json: dict,
        intent: str,
    ) -> OntologyPermission:
        role_codes = {
            str(item).strip().lower()
            for item in context_json.get("role_codes", [])
            if str(item).strip()
        }
        is_admin = bool(context_json.get("is_admin"))
        privileged = is_admin or bool(role_codes & PRIVILEGED_ROLE_CODES)

        if intent in {"query", "explain", "compare", "risk_check"}:
            return OntologyPermission(
                level=AgentPermissionLevel.READ.value,
                allowed=True,
                reason="只读查询。",
            )
        if intent == "draft":
            return OntologyPermission(
                level=AgentPermissionLevel.DRAFT_WRITE.value,
                allowed=True,
                reason="允许生成草稿，但不会直接提交业务动作。",
            )

        if any(keyword in compact_query for keyword in OPERATE_KEYWORDS) or "付款" in compact_query:
            if privileged:
                return OntologyPermission(
                    level=AgentPermissionLevel.APPROVAL_REQUIRED.value,
                    allowed=False,
                    reason="涉及付款、审批或上线动作，必须进入人工审批链。",
                )
            return OntologyPermission(
                level=AgentPermissionLevel.FORBIDDEN.value,
                allowed=False,
                reason="当前账号缺少财务或审批权限，只能查看结果或生成草稿。",
            )

        return OntologyPermission(
            level=AgentPermissionLevel.APPROVAL_REQUIRED.value,
            allowed=False,
            reason="操作类请求需要人工审批确认。",
        )

    def _build_field_errors(
        self,
        *,
        scenario: str,
        intent: str,
        entities: list[OntologyEntity],
        permission: OntologyPermission,
        missing_slots: list[str],
        ambiguity: list[str],
    ) -> list[OntologyFieldError]:
        errors: list[OntologyFieldError] = []
        if scenario == "unknown":
            errors.append(
                OntologyFieldError(
                    field="scenario",
                    code="scenario_unknown",
                    message="未识别出明确业务场景，请补充是报销、应收、应付还是制度问题。",
                )
            )
        if intent == "compare" and len([item for item in entities if item.type != "amount"]) < 2:
            errors.append(
                OntologyFieldError(
                    field="entities",
                    code="compare_target_missing",
                    message="对比类问题请至少给出两个对象，或给出更明确的对比范围。",
                )
            )
        if missing_slots:
            errors.append(
                OntologyFieldError(
                    field="missing_slots",
                    code="required_slot_missing",
                    message=(
                        "继续处理前还缺少关键信息："
                        f"{'、'.join(self._display_slot_label(item) for item in missing_slots)}。"
                    ),
                )
            )
        if ambiguity:
            errors.append(
                OntologyFieldError(
                    field="ambiguity",
                    code="ambiguity_detected",
                    message=f"当前问题存在歧义：{'；'.join(ambiguity)}。",
                )
            )
        if permission.level == AgentPermissionLevel.FORBIDDEN.value:
            errors.append(
                OntologyFieldError(
                    field="permission",
                    code="permission_forbidden",
                    message=permission.reason,
                )
            )
        return errors

    def _build_clarification(
        self,
        *,
        scenario: str,
        intent: str,
        entities: list[OntologyEntity],
        permission: OntologyPermission,
        missing_slots: list[str],
        ambiguity: list[str],
        allow_incomplete_draft: bool,
        model_clarification_required: bool,
        model_clarification_question: str | None,
    ) -> tuple[bool, str | None]:
        if permission.level == AgentPermissionLevel.FORBIDDEN.value:
            return True, "当前动作超出权限范围。是否改为生成草稿或建议？"
        if scenario == "knowledge" and intent in {"query", "explain"}:
            return False, None
        if model_clarification_required:
            question = str(model_clarification_question or "").strip()
            if question:
                return True, question
            if missing_slots:
                return True, self._build_missing_slot_question(missing_slots)
            if ambiguity:
                return True, f"当前问题存在歧义，请进一步说明：{'；'.join(ambiguity)}。"
        if scenario == "unknown":
            return True, "请说明这是报销、应收、应付，还是制度知识问题？"
        if intent == "compare" and len([item for item in entities if item.type != "amount"]) < 2:
            return True, "请补充需要对比的两个对象，例如两个客户、两个供应商或两个员工。"
        if allow_incomplete_draft and scenario == "expense" and intent == "draft":
            return False, None
        if missing_slots:
            return True, self._build_missing_slot_question(missing_slots)
        if ambiguity:
            return True, f"当前问题存在歧义，请进一步说明：{'；'.join(ambiguity)}。"
        return False, None

    @staticmethod
    def _allow_incomplete_draft(
        context_json: dict[str, Any],
        *,
        scenario: str,
        intent: str,
    ) -> bool:
        if scenario != "expense" or intent != "draft":
            return False
        review_action = str(context_json.get("review_action") or "").strip()
        return review_action in EXPENSE_REVIEW_ACTIONS

    @staticmethod
    def _display_slot_label(slot: str) -> str:
        return MISSING_SLOT_LABELS.get(slot, slot)

    def _build_missing_slot_question(self, missing_slots: list[str]) -> str:
        labels = [self._display_slot_label(item) for item in missing_slots[:4]]
        if not labels:
            return "请补充更多上下文后再继续。"
        return f"请补充{'、'.join(labels)}，我再继续帮你解析和处理。"

    @staticmethod
    def _compute_confidence(
        *,
        scenario: str,
        scenario_score: float,
        intent_score: float,
        entities: list[OntologyEntity],
        time_range: OntologyTimeRange,
        metrics: list[OntologyMetric],
        constraints: list[OntologyConstraint],
        risk_flags: list[str],
        clarification_required: bool,
        permission: OntologyPermission,
    ) -> float:
        confidence = 0.18 + scenario_score + intent_score
        confidence += min(0.16, len(entities) * 0.04)
        if time_range.start_date:
            confidence += 0.10
        if metrics:
            confidence += 0.06
        if constraints:
            confidence += 0.06
        if risk_flags:
            confidence += 0.08
        if permission.level == AgentPermissionLevel.FORBIDDEN.value:
            confidence = max(confidence, 0.86)

        if scenario == "unknown":
            confidence = min(confidence, 0.45)
        if clarification_required and permission.level != AgentPermissionLevel.FORBIDDEN.value:
            confidence = min(confidence, 0.58)

        return round(min(confidence, 0.98), 2)

    @staticmethod
    def _build_result_summary(
        scenario: str,
        intent: str,
        permission_level: str,
        confidence: float,
    ) -> str:
        return (
            f"语义解析完成：scenario={scenario}, intent={intent}, "
            f"permission={permission_level}, confidence={confidence:.2f}"
        )

    @staticmethod
    def _normalize_operator(value: str) -> str:
        mapping = {
            "超过": ">",
            "大于": ">",
            "高于": ">",
            ">": ">",
            ">=": ">=",
            "不少于": ">=",
            "不低于": ">=",
            "小于": "<",
            "低于": "<",
            "少于": "<",
            "<": "<",
            "<=": "<=",
            "至多": "<=",
            "不超过": "<=",
            "=": "=",
            "＝": "=",
        }
        return mapping.get(value, value)

    @staticmethod
    def _normalize_amount(raw_value: str | None, unit: str | None) -> int | float:
        numeric = float(raw_value or 0)
        if unit in {"万", "万元"}:
            numeric *= 10000
        return int(numeric) if numeric.is_integer() else round(numeric, 2)