/* =============================================================================
 * B05_Profile/B05_Profile_Footprint_Server.ts
 * 계산 묶음 footprint 단계(D4) + 계산 자리 「서버」 길(PLAN 511-A) — 판 fixed_browser = server 면 잠잠 뒤 서버
 * (`footprint.plan` · 같은 `footprintStage` 전 구간)가 셈 · 끊긴 차례는 묶음이 버림 · 못 받으면 브라우저 셈.
 * 판 both = 지금 그대로(같은 틱 · 브라우저 셈).
 * ========================================================================== */

import type { StageContext } from "../A00_Common/design/logic/design_pipeline_types";
import { calcOnServerNow } from "../A00_Common/design/design_calc_sites";
import {
  calcChecked,
  calcOnServerOnly,
  trialRequest,
} from "../A00_Common/design/design_calc_server";
import { footprintStage } from "./logic/B05_Profile_Footprint_Stage";
import type { FootprintLines } from "./logic/B05_Profile_PlanFootprint";

/** 단계가 읽는 몫만 — 측점(지반) · 측점 횡단 detail · 노선 선. */
export function footprintInputs(ctx: StageContext<"footprint">): unknown {
  const byKey = ctx.out.cross?.byKey ?? {};
  const route = ctx.out.route;
  return {
    ground: { stations: ctx.out.ground?.stations ?? [] },
    cross: {
      byKey: Object.fromEntries(Object.entries(byKey).map(([k, v]) => [k, { detail: v.detail }])),
    },
    route: route ? { line: route.line, chainage: route.chainage, lengthM: route.lengthM } : null,
  };
}

export function footprintStageSited(
  ctx: StageContext<"footprint">,
): FootprintLines | Promise<FootprintLines> {
  if (!calcOnServerNow("fixed_browser"))
    return calcChecked("fixed_browser", "footprint.plan", footprintStage, [ctx]);
  const asked = trialRequest("footprint.plan", [footprintInputs(ctx)]);
  return calcOnServerOnly<FootprintLines>("fixed_browser", "D4", asked, ctx.signal).then(
    (lines) => lines ?? footprintStage(ctx),
  );
}