from __future__ import annotations

import json
import re
from datetime import UTC, datetime, timedelta
from decimal import Decimal, InvalidOperation
from typing import Any

from sqlalchemy import or_, select
from sqlalchemy.orm import selectinload

from app.api.deps import CurrentUserContext
from app.core.agent_enums import AgentAssetStatus, AgentAssetType
from app.models.employee import Employee
from app.models.financial_record import ExpenseClaim
from app.schemas.agent_asset import AgentAssetListItem
from app.schemas.reimbursement import TravelReimbursementCalculatorRequest
from app.schemas.user_agent import (
    UserAgentCitation,
    UserAgentDraftPayload,
    UserAgentExpenseQueryRecord,
    UserAgentQueryPayload,
    UserAgentQueryStatusGroup,
    UserAgentReviewAction,
    UserAgentReviewClaimGroup,
    UserAgentReviewDocumentCard,
    UserAgentReviewDocumentField,
    UserAgentReviewEditField,
    UserAgentReviewPayload,
    UserAgentReviewRiskBrief,
    UserAgentReviewSlotCard,
    UserAgentRequest,
    UserAgentSuggestedAction,
)
from app.services.agent_assets import AgentAssetService
from app.services.expense_claims import ExpenseClaimService
from app.services.expense_rule_runtime import ExpenseRuleRuntimeService, RuntimeTravelPolicy, resolve_document_type_label
from app.services.ontology_field_registry import normalize_ontology_form_values
from app.services.risk_ontology_bridge import resolve_rule_codes_for_risk_check
from app.services.travel_reimbursement_calculator import TravelReimbursementCalculatorService
from app.services.user_agent_constants import *


class UserAgentReviewTravelReceiptMixin:

    def _is_travel_review_context(
        self,
        payload: UserAgentRequest,
        document_cards: list[UserAgentReviewDocumentCard],
        claim_groups: list[UserAgentReviewClaimGroup],
    ) -> bool:
        entity_expense_type = self._collect_entity_values(payload).get("expense_type_code", "")
        review_form_values = self._resolve_review_form_values(payload)
        form_expense_type = str(review_form_values.get("expense_type") or "").strip()
        message_context = " ".join(
            [
                str(payload.message or ""),
                str(payload.context_json.get("user_input_text") or ""),
                str(payload.context_json.get("expense_type") or ""),
                form_expense_type,
            ]
        )
        if entity_expense_type in {"travel", "hotel", "transport"}:
            return True
        if any(group.group_code == "travel" or group.expense_type in {"travel", "hotel", "transport"} for group in claim_groups):
            return True
        if any(card.suggested_expense_type in {"travel", "hotel", "transport"} for card in document_cards):
            return True
        return any(keyword in message_context for keyword in ("差旅", "出差", "机票", "火车", "高铁", "酒店", "住宿"))


    def _build_travel_receipt_state(
        self,
        payload: UserAgentRequest,
        *,
        document_cards: list[UserAgentReviewDocumentCard],
        claim_groups: list[UserAgentReviewClaimGroup],
    ) -> dict[str, Any]:
        empty_state: dict[str, Any] = {
            "is_travel_context": False,
            "has_long_distance_ticket": False,
            "ticket_type_label": "",
            "ticket_amount": Decimal("0.00"),
            "destination": "",
            "days": 1,
            "has_hotel_invoice": False,
            "has_local_transport": False,
            "required_missing_labels": [],
            "optional_missing_labels": [],
            "blocks_next_step": False,
        }
        if not document_cards or not self._is_travel_review_context(payload, document_cards, claim_groups):
            return empty_state

        long_distance_cards = [card for card in document_cards if self._is_long_distance_travel_card(card)]
        if not long_distance_cards:
            return {
                **empty_state,
                "is_travel_context": True,
            }

        has_hotel_invoice = any(self._is_review_hotel_card(card) for card in document_cards)
        required_missing_labels = [] if has_hotel_invoice else ["酒店的报销票据待上传（必须）"]
        ticket_amount = sum(
            (self._extract_amount_decimal_from_card(card) or Decimal("0.00"))
            for card in long_distance_cards
        ).quantize(Decimal("0.01"))

        return {
            **empty_state,
            "is_travel_context": True,
            "has_long_distance_ticket": True,
            "ticket_type_label": self._resolve_travel_ticket_type_label(long_distance_cards),
            "ticket_amount": ticket_amount,
            "destination": self._resolve_travel_receipt_destination(payload, long_distance_cards),
            "days": self._resolve_travel_receipt_days(payload, long_distance_cards),
            "has_hotel_invoice": has_hotel_invoice,
            "has_local_transport": any(self._is_local_transport_receipt_card(card) for card in document_cards),
            "required_missing_labels": required_missing_labels,
            "optional_missing_labels": [],
            "blocks_next_step": bool(required_missing_labels),
        }


    @staticmethod
    def _is_long_distance_travel_card(card: UserAgentReviewDocumentCard) -> bool:
        document_type = str(card.document_type or "").strip().lower()
        return document_type in {"train_ticket", "flight_itinerary"}


    @staticmethod
    def _is_local_transport_receipt_card(card: UserAgentReviewDocumentCard) -> bool:
        document_type = str(card.document_type or "").strip().lower()
        suggested_type = str(card.suggested_expense_type or "").strip().lower()
        return document_type in {"taxi_receipt", "parking_toll_receipt", "transport_receipt"} or (
            suggested_type == "transport" and document_type not in {"train_ticket", "flight_itinerary"}
        )


    @staticmethod
    def _resolve_travel_ticket_type_label(cards: list[UserAgentReviewDocumentCard]) -> str:
        labels: list[str] = []
        for card in cards:
            document_type = str(card.document_type or "").strip().lower()
            if document_type == "train_ticket" and "火车" not in labels:
                labels.append("火车")
            if document_type == "flight_itinerary" and "飞机" not in labels:
                labels.append("飞机")
        return "/".join(labels) if labels else "交通"


    def _resolve_travel_receipt_destination(
        self,
        payload: UserAgentRequest,
        long_distance_cards: list[UserAgentReviewDocumentCard],
    ) -> str:
        for card in long_distance_cards:
            for field in card.fields:
                if str(field.label or "").strip() not in {"行程", "路线"}:
                    continue
                destination = self._extract_travel_destination_from_route(field.value)
                if destination:
                    return self._normalize_travel_destination(destination)

            card_text = self._build_review_document_card_text(card)
            route_match = TRAVEL_ROUTE_PATTERN.search(card_text)
            if route_match:
                return self._normalize_travel_destination(route_match.group(2))

        location = self._resolve_location_value(payload)
        if location:
            return self._normalize_travel_destination(location)
        return ""


    @staticmethod
    def _extract_travel_destination_from_route(value: str) -> str:
        route_text = str(value or "").strip()
        if not route_text:
            return ""
        route_match = TRAVEL_ROUTE_PATTERN.search(route_text)
        if route_match:
            return route_match.group(2).strip()
        parts = [
            item.strip()
            for item in re.split(r"\s*(?:至|到|→|->|-|—|~|～)\s*", route_text)
            if item.strip()
        ]
        return parts[-1] if len(parts) >= 2 else ""


    def _normalize_travel_destination(self, value: str) -> str:
        candidate = re.sub(
            r"(?:火车站|高铁站|动车站|车站|站|机场|航站楼)$",
            "",
            str(value or "").strip(),
        )
        if not candidate:
            return ""
        try:
            policy = ExpenseRuleRuntimeService(self.db).load_catalog().travel_policy
        except Exception:
            policy = None
        if policy is not None:
            policy_city = self._extract_policy_city_from_text(candidate, policy)
            if policy_city:
                return policy_city
        return candidate


    def _resolve_travel_receipt_days(
        self,
        payload: UserAgentRequest,
        long_distance_cards: list[UserAgentReviewDocumentCard],
    ) -> int:
        dates: list[datetime] = []
        for card in long_distance_cards:
            card_text = self._build_review_document_card_text(card)
            dates.extend(self._extract_dates_from_text(card_text))

        if dates:
            return max(1, (max(dates).date() - min(dates).date()).days + 1)

        start_date = self._parse_date_text(payload.ontology.time_range.start_date or "")
        end_date = self._parse_date_text(payload.ontology.time_range.end_date or "")
        if start_date and end_date:
            return max(1, (end_date.date() - start_date.date()).days + 1)
        return 1


    @staticmethod
    def _extract_dates_from_text(text: str) -> list[datetime]:
        dates: list[datetime] = []
        for match in DATE_TEXT_PATTERN.finditer(str(text or "")):
            parsed = UserAgentReviewTravelReceiptMixin._parse_date_text(match.group(1))
            if parsed is not None:
                dates.append(parsed)
        return dates


    @staticmethod
    def _parse_date_text(value: str) -> datetime | None:
        raw_value = str(value or "").strip()
        if not raw_value:
            return None
        normalized = (
            raw_value.replace("年", "-")
            .replace("月", "-")
            .replace("/", "-")
            .replace("日", "")
            .strip()
        )
        parts = [part for part in normalized.split("-") if part]
        if len(parts) != 3:
            return None
        try:
            year, month, day = (int(part) for part in parts)
            return datetime(year, month, day)
        except ValueError:
            return None


    def _build_travel_receipt_briefs(
        self,
        travel_receipt_state: dict[str, Any],
    ) -> list[UserAgentReviewRiskBrief]:
        if not travel_receipt_state.get("has_long_distance_ticket"):
            return []

        required_labels = [
            str(item).strip()
            for item in travel_receipt_state.get("required_missing_labels", [])
            if str(item).strip()
        ]
        if not required_labels:
            return []

        required_text = "；".join(required_labels)
        return [
            UserAgentReviewRiskBrief(
                title="差旅票据待补充",
                level="warning",
                content=required_text,
                detail=(
                    "系统已识别到长途交通票据，会按差旅报销口径核对住宿、交通等票据完整性。"
                    + f"当前必须补充：{required_text}。"
                ),
                suggestion="请先补充酒店住宿发票或住宿清单；在补齐前只能保存为草稿。",
            )
        ]


    def _resolve_review_travel_allowance_standard(
        self,
        policy: RuntimeTravelPolicy,
        *,
        declared_city: str,
        card_text: str,
    ) -> tuple[str, Decimal] | None:
        meal_limits = getattr(policy, "allowance_limits", {}).get("meal", {})
        if not meal_limits:
            return None

        region_label = self._resolve_review_travel_allowance_region(
            " ".join([declared_city or "", card_text or ""])
        )
        amount = meal_limits.get(region_label)
        if amount is None and region_label != "其他地区":
            amount = meal_limits.get("其他地区")
            region_label = "其他地区"
        if amount is None:
            return None
        return region_label, Decimal(amount).quantize(Decimal("0.01"))


    @staticmethod
    def _resolve_review_travel_allowance_region(text: str) -> str:
        normalized = re.sub(r"\s+", "", str(text or ""))
        if not normalized:
            return "其他地区"
        if any(keyword in normalized for keyword in ("境外", "国外", "海外")):
            return "国外"
        if any(keyword in normalized for keyword in ("香港", "澳门", "台湾", "港澳台")):
            return "港澳台"
        if "乌鲁木齐" in normalized:
            return "新疆-乌鲁木齐"
        if "新疆" in normalized:
            return "新疆-其他"
        if any(keyword in normalized for keyword in ("西藏", "拉萨")):
            return "西藏"
        if any(keyword in normalized for keyword in ("北京", "上海", "天津", "重庆", "深圳", "珠海", "汕头", "厦门")):
            return "直辖市/特区"
        return "其他地区"


    def _resolve_review_amount_scene_code(
        self,
        card: UserAgentReviewDocumentCard,
        payload: UserAgentRequest,
    ) -> str:
        document_type = str(card.document_type or "").strip().lower()
        suggested_type = str(card.suggested_expense_type or "").strip().lower()
        if document_type in {"taxi_receipt", "parking_toll_receipt", "transport_receipt"}:
            return "transport"
        if document_type == "meal_receipt":
            entity_values = self._collect_entity_values(payload)
            if suggested_type == "entertainment" or entity_values.get("expense_type_code") == "entertainment":
                return "entertainment"
            return "meal"
        if document_type == "hotel_invoice" or suggested_type == "hotel":
            return "hotel"
        if suggested_type in {
            "travel",
            "transport",
            "meal",
            "entertainment",
            "office",
            "meeting",
            "training",
            "communication",
            "welfare",
            "other",
        }:
            return suggested_type
        return self._collect_entity_values(payload).get("expense_type_code") or "other"


    @staticmethod
    def _resolve_review_scene_amount_limit(scene_policy: Any | None) -> Any | None:
        if scene_policy is None:
            return None
        return getattr(scene_policy, "item_amount_limit", None) or getattr(scene_policy, "claim_amount_limit", None)


    @staticmethod
    def _resolve_scene_standard_amount(limit_config: Any | None) -> Decimal | None:
        if limit_config is None:
            return None
        warn_amount = getattr(limit_config, "warn_amount", None)
        block_amount = getattr(limit_config, "block_amount", None)
        amount = warn_amount if warn_amount is not None else block_amount
        if amount is None:
            return None
        try:
            return Decimal(amount).quantize(Decimal("0.01"))
        except (InvalidOperation, ValueError):
            return None


    @staticmethod
    def _evaluate_review_scene_amount(
        *,
        amount: Decimal,
        limit_config: Any,
        reason_text: str,
    ) -> tuple[str, Decimal] | None:
        block_amount = getattr(limit_config, "block_amount", None)
        warn_amount = getattr(limit_config, "warn_amount", None)
        exception_keywords = list(getattr(limit_config, "exception_keywords", []) or [])
        has_exception = UserAgentReviewTravelReceiptMixin._text_contains_any(reason_text, exception_keywords)

        if block_amount is not None and amount > Decimal(block_amount):
            return ("high", Decimal(block_amount).quantize(Decimal("0.01")))
        if warn_amount is not None and amount > Decimal(warn_amount):
            return ("high", Decimal(warn_amount).quantize(Decimal("0.01")))
        return None


    def _resolve_review_employee_grade(self, payload: UserAgentRequest, *, employee: Employee | None) -> str:
        if employee is not None and employee.grade:
            return str(employee.grade).strip()
        review_form_values = self._resolve_review_form_values(payload)
        for source in (
            review_form_values,
            payload.context_json,
            payload.tool_payload,
        ):
            for key in ("employee_grade", "grade", "user_grade", "position_grade"):
                value = str(source.get(key) or "").strip() if isinstance(source, dict) else ""
                if value:
                    return value
        return ""


    def _build_review_reason_corpus(self, payload: UserAgentRequest) -> str:
        review_form_values = normalize_ontology_form_values(self._resolve_review_form_values(payload))
        parts = [
            str(payload.message or ""),
            str(payload.context_json.get("user_input_text") or ""),
            str(review_form_values.get("reason") or ""),
            str(review_form_values.get("location") or ""),
        ]
        return "\n".join(part.strip() for part in parts if part and part.strip())


    def _resolve_declared_travel_city(self, payload: UserAgentRequest, policy: RuntimeTravelPolicy) -> str:
        review_form_values = normalize_ontology_form_values(self._resolve_review_form_values(payload))
        candidates = [
            str(review_form_values.get("location") or ""),
            self._resolve_location_value(payload),
            str(payload.message or ""),
        ]
        for candidate in candidates:
            city = self._extract_policy_city_from_text(candidate, policy)
            if city:
                return city
        return ""


    @staticmethod
    def _build_review_document_card_text(card: UserAgentReviewDocumentCard) -> str:
        field_text = " ".join(f"{field.label}:{field.value}" for field in card.fields)
        return " ".join(
            [
                str(card.filename or ""),
                str(card.document_type or ""),
                str(card.scene_label or ""),
                str(card.summary or ""),
                field_text,
            ]
        ).strip()


    @staticmethod
    def _is_review_hotel_card(card: UserAgentReviewDocumentCard) -> bool:
        document_type = str(card.document_type or "").strip().lower()
        suggested_type = str(card.suggested_expense_type or "").strip().lower()
        scene_label = str(card.scene_label or "").strip()
        return document_type == "hotel_invoice" or suggested_type == "hotel" or "住宿" in scene_label


    @staticmethod
    def _extract_amount_decimal_from_card(card: UserAgentReviewDocumentCard) -> Decimal | None:
        for field in card.fields:
            if field.label != "金额":
                continue
            normalized = str(field.value or "").replace("元", "").replace("￥", "").replace("¥", "").replace(",", "").strip()
            try:
                amount = Decimal(normalized).quantize(Decimal("0.01"))
            except (InvalidOperation, ValueError):
                continue
            if amount > Decimal("0.00"):
                return amount
        return None


    @staticmethod
    def _extract_review_hotel_night_count(card: UserAgentReviewDocumentCard) -> int:
        text = f"{card.summary or ''} {' '.join(f'{field.label}:{field.value}' for field in card.fields)}"
        match = TRAVEL_REVIEW_HOTEL_NIGHT_PATTERN.search(text)
        if not match:
            return 1
        try:
            return max(1, int(match.group(1)))
        except (TypeError, ValueError):
            return 1


    @staticmethod
    def _extract_policy_city_from_text(text: str, policy: RuntimeTravelPolicy) -> str:
        normalized = str(text or "").strip()
        if not normalized:
            return ""
        city_names = set(policy.city_tiers.keys())
        city_names.update(getattr(policy, "hotel_city_limits", {}).keys())
        for city in sorted(city_names, key=lambda item: len(item), reverse=True):
            if city in normalized:
                return city
        return ""


    @staticmethod
    def _format_travel_city_tier(city_tier: str) -> str:
        return {
            "tier_1": "一线城市",
            "tier_2": "重点城市",
            "tier_3": "其他城市",
        }.get(str(city_tier or "").strip(), "当前城市")


    @staticmethod
    def _resolve_review_hotel_cap(
        policy: RuntimeTravelPolicy,
        *,
        grade_band: str,
        city: str,
        city_tier: str,
    ) -> Decimal:
        normalized_city = str(city or "").strip()
        if normalized_city and getattr(policy, "hotel_city_limits", None):
            city_limits = policy.hotel_city_limits.get(normalized_city, {})
            city_cap = city_limits.get(grade_band)
            if city_cap is not None:
                return Decimal(city_cap).quantize(Decimal("0.01"))
        return Decimal(policy.hotel_limits.get(grade_band, {}).get(city_tier, Decimal("0.00"))).quantize(
            Decimal("0.01")
        )


    def _detect_review_transport_class(
        self,
        card: UserAgentReviewDocumentCard,
        policy: RuntimeTravelPolicy,
    ) -> tuple[str, str, int] | None:
        document_type = str(card.document_type or "").strip().lower()
        text = re.sub(r"\s+", "", self._build_review_document_card_text(card))
        if not text:
            return None

        if document_type == "flight_itinerary" or any(keyword in text for keyword in ("机票", "航班", "登机牌")):
            for config in policy.flight_classes:
                label = str(config.keyword or "").strip()
                if label and label in text:
                    return "flight", label, int(config.level)

        if document_type == "train_ticket" or any(keyword in text for keyword in ("火车", "高铁", "动车", "铁路")):
            for config in policy.train_classes:
                label = str(config.keyword or "").strip()
                if label and label in text:
                    return "train", label, int(config.level)
        return None


    @staticmethod
    def _text_contains_any(text: str, keywords: list[str] | tuple[str, ...]) -> bool:
        compact = re.sub(r"\s+", "", str(text or ""))
        return bool(compact) and any(str(keyword or "").strip() and str(keyword).strip() in compact for keyword in keywords)


    @staticmethod
    def _resolve_submission_blocked_reasons(payload: UserAgentRequest) -> list[str]:
        raw_reasons = payload.tool_payload.get("submission_blocked_reasons")
        submission_blocked = bool(payload.tool_payload.get("submission_blocked"))
        if raw_reasons is None and submission_blocked:
            raw_reasons = payload.tool_payload.get("missing_fields")
        if raw_reasons is None and not submission_blocked:
            return []

        reasons: list[str] = []
        if isinstance(raw_reasons, list):
            reasons.extend(str(item or "").strip() for item in raw_reasons)
        elif isinstance(raw_reasons, str):
            reasons.extend(
                item.strip()
                for item in re.split(r"[；;\n]+", raw_reasons)
                if item.strip()
            )

        if not reasons and submission_blocked:
            message = str(payload.tool_payload.get("message") or "").strip()
            for prefix in (
                "提交前请先补全信息：",
                "自动检测暂未通过，原因如下：",
                "自动检测未通过，原因如下：",
                "自动检测暂未通过：",
                "自动检测未通过：",
                "AI预审暂未通过，原因如下：",
                "AI预审未通过，原因如下：",
                "AI预审暂未通过：",
                "AI预审未通过：",
            ):
                if message.startswith(prefix):
                    message = message[len(prefix):].strip()
                    break
            if message:
                reasons.extend(
                    item.strip()
                    for item in re.split(r"[；;\n]+", message)
                    if item.strip()
                    and not item.strip().startswith("AI预审暂未通过")
                    and not item.strip().startswith("自动检测暂未通过")
                )

        return list(dict.fromkeys(reason for reason in reasons if reason))