/**
 * gear_identity_collisions 조회 + 분류 액션 API 서비스.
 * 백엔드 /api/analysis/gear-collisions 연동.
 */

import type { AnalysisPageResponse } from './analysisApi';

const API_BASE = import.meta.env.VITE_API_URL ?? '/api';

// ─── DTO (백엔드 GearCollisionResponse 1:1 매핑) ─────────────

export interface GearCollision {
  id: number;
  name: string;
  mmsiLo: string;
  mmsiHi: string;
  parentName: string | null;
  parentVesselId: number | null;
  firstSeenAt: string;
  lastSeenAt: string;
  coexistenceCount: number;
  swapCount: number;
  maxDistanceKm: number | null;
  lastLatLo: number | null;
  lastLonLo: number | null;
  lastLatHi: number | null;
  lastLonHi: number | null;
  severity: 'CRITICAL' | 'HIGH' | 'MEDIUM' | 'LOW' | string;
  status: 'OPEN' | 'REVIEWED' | 'CONFIRMED_ILLEGAL' | 'FALSE_POSITIVE' | string;
  resolutionNote: string | null;
  evidence: Array<Record<string, unknown>> | null;
  updatedAt: string;
}

export interface GearCollisionStats {
  total: number;
  byStatus: Record<string, number>;
  bySeverity: Record<string, number>;
  hours: number;
}

export type GearCollisionResolveAction =
  | 'REVIEWED'
  | 'CONFIRMED_ILLEGAL'
  | 'FALSE_POSITIVE'
  | 'REOPEN';

export interface GearCollisionResolveRequest {
  action: GearCollisionResolveAction;
  note?: string;
}

// ─── 내부 헬퍼 ─────────────

function buildQuery(params: Record<string, unknown>): string {
  const qs = new URLSearchParams();
  for (const [k, v] of Object.entries(params)) {
    if (v === undefined || v === null || v === '') continue;
    qs.set(k, String(v));
  }
  const s = qs.toString();
  return s ? `?${s}` : '';
}

async function apiGet<T>(path: string, params: Record<string, unknown> = {}): Promise<T> {
  const res = await fetch(`${API_BASE}${path}${buildQuery(params)}`, { credentials: 'include' });
  if (!res.ok) throw new Error(`API error: ${res.status}`);
  return res.json();
}

async function apiPost<T>(path: string, body: unknown): Promise<T> {
  const res = await fetch(`${API_BASE}${path}`, {
    method: 'POST',
    credentials: 'include',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(body),
  });
  if (!res.ok) throw new Error(`API error: ${res.status}`);
  return res.json();
}

// ─── 공개 함수 ─────────────

/** 어구 정체성 충돌 목록 조회 (필터 + 페이징). */
export function listGearCollisions(params?: {
  status?: string;
  severity?: string;
  name?: string;
  hours?: number;
  page?: number;
  size?: number;
}): Promise<AnalysisPageResponse<GearCollision>> {
  return apiGet('/analysis/gear-collisions', {
    hours: 48, page: 0, size: 50, ...params,
  });
}

/** status/severity 집계 */
export function getGearCollisionStats(hours = 48): Promise<GearCollisionStats> {
  return apiGet('/analysis/gear-collisions/stats', { hours });
}

/** 단건 상세 조회 */
export function getGearCollision(id: number): Promise<GearCollision> {
  return apiGet(`/analysis/gear-collisions/${id}`);
}

/** 운영자 분류 액션 */
export function resolveGearCollision(
  id: number,
  body: GearCollisionResolveRequest,
): Promise<GearCollision> {
  return apiPost(`/analysis/gear-collisions/${id}/resolve`, body);
}