Aislo/B08_Quantity/B08_Quantity_UI_Milestone_State.ts

/* =============================================================================
 * B08_Quantity_UI_Milestone_State.ts
 * 거리이정표(PLAN 244-1) 데이터 층 — 저장본 · 캐시 · [저장] · 경로 그림 길(좌측 패널 카드는 244-6 에서 없앰 ·
 * 공사지 · 기준점은 다이어그램 모달).
 *
 *   저장본 = GET …/quantity/milestone(서버 정본 · 표는 서버가 셈) · 조작 = 캐시 `b08-milestone` 즉시 +
 *   표는 TS 짝(`…_Milestone_Calc`)이 바로 셈 · [저장](좌측 패널 한 줄) = PUT → 캐시 비움 · 자동 저장 없음.
 *   그림 = 올리는 즉시 서버(경로 하나 = 그림 하나 · B09 견적서 꼴).
 * ========================================================================== */

import { API_BASE_URL } from "@config/config_frontend";
import { clearState, readState, writeState } from "../A00_Common/b_page_state";
import { request } from "./B08_Quantity_UI_Hydro";
import { ROADS, type MilestoneData } from "./B08_Quantity_Milestone_Calc";

export interface SiteInfo {
  length_m: number | null;
  mid_default_m: number | null;
  start_lonlat: [number, number] | null;
  mid_lonlat: [number, number] | null;
}

interface Payload {
  data: MilestoneData;
  site: SiteInfo;
  images: Record<string, string>;
}

export const EMPTY: MilestoneData = {
  site: { mid_station_m: null, mid_road: "비포장" },
  base: { enabled: false, name: "", address: "", dir: null, legs: [] },
  routes: [],
};

const changes = new EventTarget();
let saved: Payload | null = null;
let savedFor: string | null = null;

const clone = <T>(value: T): T => JSON.parse(JSON.stringify(value)) as T;

/** 저장본 읽기(프로젝트마다 한 번 · force = 다시) */
export async function loadMilestone(projectId: string, force = false): Promise<Payload> {
  if (!saved || savedFor !== projectId || force) {
    saved = await request<Payload>(`/projects/${projectId}/quantity/milestone`);
    savedFor = projectId;
    changes.dispatchEvent(new Event("change"));
  }
  return saved;
}

export const siteInfo = (): SiteInfo | null => saved?.site ?? null;
export const routeImages = (): Record<string, string> => saved?.images ?? {};

export const hasMilestoneDraft = (projectId: string): boolean =>
  readState<MilestoneData>("b08-milestone", projectId) !== null;

/** 지금 값 — 캐시 → 저장본 → 빈 꼴(늘 복사본) */
export function liveMilestone(projectId: string): MilestoneData {
  return clone(readState<MilestoneData>("b08-milestone", projectId) ?? saved?.data ?? EMPTY);
}

/** 고친 한 벌을 캐시에 · 화면에 알림 */
export function putMilestone(projectId: string, data: MilestoneData): void {
  writeState("b08-milestone", data, projectId);
  changes.dispatchEvent(new Event("change"));
}

/** host 가 붙어 있는 동안 바뀔 때마다 fn — 떨어진 뒤 첫 알림에서 스스로 뗌 */
export function onMilestoneChange(host: HTMLElement, fn: () => void): void {
  const listener = (): void => {
    if (host.isConnected) fn();
    else changes.removeEventListener("change", listener);
  };
  changes.addEventListener("change", listener);
}

/** [저장] — 캐시가 있을 때만 PUT · 서버가 표를 다시 셈 */
export async function saveMilestone(projectId: string): Promise<void> {
  const draft = readState<MilestoneData>("b08-milestone", projectId);
  if (!draft) return;
  saved = await request<Payload>(`/projects/${projectId}/quantity/milestone`, {
    method: "PUT",
    body: JSON.stringify(draft),
  });
  savedFor = projectId;
  clearState("b08-milestone", projectId);
  changes.dispatchEvent(new Event("change"));
}

const imageUrl = (projectId: string, routeId: string): string =>
  `${API_BASE_URL}/projects/${projectId}/quantity/milestone/image?route=${encodeURIComponent(routeId)}`;

async function call(input: string, init: RequestInit = {}): Promise<Response> {
  const response = await fetch(input, { credentials: "include", ...init });
  if (!response.ok) {
    const body = (await response.json().catch(() => null)) as { detail?: unknown } | null;
    throw new Error(typeof body?.detail === "string" ? body.detail : `HTTP ${response.status}`);
  }
  return response;
}

/** 경로 그림 — 올리기(교체) · 지우기는 즉시 서버 · 목록 고쳐 알림 */
export async function uploadImage(projectId: string, routeId: string, file: File): Promise<void> {
  const form = new FormData();
  form.append("file", file);
  const body = (await (
    await call(imageUrl(projectId, routeId), { method: "POST", body: form })
  ).json()) as { name: string };
  if (saved) saved.images = { ...saved.images, [routeId]: body.name };
  changes.dispatchEvent(new Event("change"));
}

export async function deleteImage(projectId: string, routeId: string): Promise<void> {
  await call(imageUrl(projectId, routeId), { method: "DELETE" });
  if (saved) {
    const rest = { ...saved.images };
    delete rest[routeId];
    saved.images = rest;
  }
  changes.dispatchEvent(new Event("change"));
}

/** 그림 → 화면 주소(blob · 쿠키 포함) */
export async function imageBlobUrl(projectId: string, routeId: string): Promise<string> {
  return URL.createObjectURL(await (await call(imageUrl(projectId, routeId))).blob());
}

export const roadOptions = ROADS.map((r) => ({ value: r, text: r }));