from __future__ import annotations

from datetime import datetime, timezone
from typing import Any
from uuid import UUID

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field

from backend.database import db
from backend.routers.auth import require_roles
from services.rules_analysis import rules_analyze
from services.search_engine import (
    SearchInput,
    build_search_model,
)

router = APIRouter(prefix='/api/v1/analyze', tags=['analyze'])


class AnalysisRequest(BaseModel):
    case_id: UUID | None = None
    age: int | None = None
    gender: str | None = None
    terrain: str | list[str] | None = None
    weather: str | None = None
    elapsed_hours: float | None = None
    last_location: str | None = None
    circumstances: str | None = None
    physical_condition: str | None = None
    experience: str | None = None
    season: str | None = None
    diagnosis_type: list[str] = Field(default_factory=list)
    has_transport: str | None = None
    psychotype_answers: dict[str, Any] = Field(default_factory=dict)
    tnp_lat: float | None = None
    tnp_lon: float | None = None
    lat: float | None = None
    lon: float | None = None
    profiles: list[str] = Field(default_factory=list)


@router.post('', dependencies=[Depends(require_roles(['operator', 'field', 'admin']))])
async def analyze_case(payload: AnalysisRequest) -> dict[str, Any]:
    # B14: роутер — тонкая обёртка. Вся расчётная логика — в
    # services/search_engine.py::build_search_model (без DB/auth/HTTP).
    case_data: dict[str, Any] = {
        'age': payload.age,
        'gender': payload.gender,
        'terrain': payload.terrain,
        'weather': payload.weather,
        'elapsed_hours': payload.elapsed_hours,
        'last_location': payload.last_location,
        'circumstances': payload.circumstances,
        'physical_condition': payload.physical_condition,
        'experience': payload.experience,
        'season': payload.season,
        'diagnosis_type': payload.diagnosis_type,
        'has_transport': payload.has_transport,
        'psychotype_answers': payload.psychotype_answers,
        'lat': payload.lat if payload.lat is not None else payload.tnp_lat,
        'lon': payload.lon if payload.lon is not None else payload.tnp_lon,
    }
    case_data = {
        k: v for k, v in case_data.items()
        if v is not None and not (isinstance(v, (list, dict)) and len(v) == 0)
    }

    if payload.case_id is not None:
        case = db.get_case(str(payload.case_id))
        if not case:
            raise HTTPException(status_code=404, detail='Case not found')
        case_data = {**case.to_detail(), **case_data}
        # Карточка хранит координаты в tnp_lat/tnp_lon (gps_lat/lon — алиасы
        # to_detail). Без этой подстройки case_id-режим терял координаты ТНП:
        # rules_analyze не строил geo-зоны и отдавал fallback «Ближняя N /
        # Средняя E» — источник «вверх-вправо» на карте.
        if case_data.get('lat') is None:
            case_data['lat'] = case_data.get('tnp_lat') or case_data.get('gps_lat')
        if case_data.get('lon') is None:
            case_data['lon'] = case_data.get('tnp_lon') or case_data.get('gps_lon')

    search_input = SearchInput(
        age=case_data.get('age'),
        gender=case_data.get('gender'),
        terrain=case_data.get('terrain'),
        terrain_primary=case_data.get('terrain_primary'),
        weather=case_data.get('weather'),
        elapsed_hours=case_data.get('elapsed_hours'),
        last_location=case_data.get('last_location'),
        circumstances=case_data.get('circumstances'),
        physical_condition=case_data.get('physical_condition'),
        experience=case_data.get('experience'),
        season=case_data.get('season'),
        diagnosis_type=case_data.get('diagnosis_type') or [],
        has_transport=case_data.get('has_transport'),
        cant_swim=bool(case_data.get('cant_swim')),
        psychotype_answers=case_data.get('psychotype_answers') or {},
        profiles=case_data.get('profiles') or [],
        lat=case_data.get('lat'),
        lon=case_data.get('lon'),
        loss_time=case_data.get('loss_time'),
        time_of_day=case_data.get('time_of_day'),
    )

    model = await build_search_model(search_input, analyzer=rules_analyze)
    result = model.model_dump()

    result['case_id'] = str(payload.case_id) if payload.case_id else None
    result['analyzed_at'] = datetime.now(timezone.utc).isoformat()

    if payload.case_id is not None:
        db.update_case(str(payload.case_id), analysis_log=result, status='analyzed')

    return result


@router.post('/combined', dependencies=[Depends(require_roles(['operator', 'field', 'admin']))])
async def analyze_combined(payload: AnalysisRequest) -> dict[str, Any]:
    return await analyze_case(payload)


@router.get('/{case_id}')
def get_analysis(case_id: str) -> dict[str, Any]:
    case = db.get_case(case_id)
    if not case:
        raise HTTPException(status_code=404, detail='Case not found')
    detail = case.to_detail()
    if not detail.get('analysis_log'):
        raise HTTPException(status_code=404, detail=f'No analysis found for case {case_id}')
    return {
        'case_id': case_id,
        'analysis_log': detail['analysis_log'],
        'created_at': detail['created_at'],
    }