/* =============================================================================
 * D01_PlanRegister_UI_Page.ts
 * D01 예정노선 등록(요구서 345 3-1 · PLAN 529-1) — B02 등록 화면 꼴 · 도면 칸 없음.
 *   칸 = 사업연도 시작 · 끝 · 사업지역 · 종류 「노선 계획」(고정) · 임도 종류(B02 값) · 설계속도
 *   (종류별 고를 수 있는 값 · 기본 = 가장 낮은 값 = B05 resolve_design_speed) · 프로젝트명(B02 이름
 *   조합기 · 연도 자리 = 「시작~끝」) · 노선 시작 · 종료 누가거리.
 *   [등록] = POST /api/d01/project → 현재 프로젝트 · D02 로.
 * ========================================================================== */

import "../B02_ProjRegister/B02_ProjRegister_UI_Style.css";
import { ROUTES } from "@config/config_frontend";
import {
  createButton,
  createCard,
  createInputField,
  createSelectField,
} from "@ui/ui_template_elements";
import { createGeneralLayout } from "@ui/ui_template_general_layout";
import { createHelpButton } from "@ui/ui_template_help";
import { createText } from "@ui/ui_template_text";
import { t } from "@ui/ui_template_locale";
import { stationLabel } from "../common_util/common_util_station";
import { createGroupProject } from "../A00_Common/group_workflow";
import { navigateTo } from "../A00_Common/router";
import { createNameComposer } from "../B02_ProjRegister/B02_ProjRegister_UI_Name";
import { SPEED_CHOICES } from "../B05_Profile/logic/B05_Profile_Grade_Criteria";

/** B02 임도 종류 → 설계속도 기준 등급(B05 grade_class_of 와 같음) */
const GRADE_CLASS: Record<string, string> = { main: "trunk", fire: "fire", work: "work" };

/** 측점 간격 — D03 `PLAN_STATION_INTERVAL_M` 와 같음 */
const STATION_INTERVAL_M = 20;

const numberOrNull = (text: string): number | null =>
  text.trim() === "" ? null : Number.parseFloat(text);

export function renderD01PlanRegister(root: HTMLElement): void {
  const year = new Date().getFullYear();
  const yearStart = createInputField({
    label: t("DE_Reg_YearStart"),
    type: "number",
    value: String(year),
    min: 2000,
    max: 2100,
  });
  const yearEnd = createInputField({
    label: t("DE_Reg_YearEnd"),
    type: "number",
    value: String(year),
    min: 2000,
    max: 2100,
  });
  const region = createInputField({
    label: t("B02_Proj_Field_Region"),
    placeholder: t("B02_Proj_Field_Region_Placeholder"),
    required: true,
  });
  const kind = createInputField({ label: t("DE_Reg_Kind"), value: t("DE_Reg_KindPlan") });
  kind.input.readOnly = true;
  const roadType = createSelectField({
    label: t("B02_Proj_Field_RoadType"),
    options: [
      { value: "main", text: t("B02_Proj_RoadType_Main") },
      { value: "fire", text: t("B02_Proj_RoadType_Fire") },
      { value: "work", text: t("B02_Proj_RoadType_Work") },
    ],
  });
  const speed = createSelectField({ label: t("DE_Reg_DesignSpeed"), options: [] });
  const name = createInputField({ label: t("DE_Reg_Name"), required: true });
  const startM = createInputField({ label: t("DE_Reg_StartM"), type: "number", min: 0 });
  const endM = createInputField({ label: t("DE_Reg_EndM"), type: "number", min: 0 });
  // 누가거리 칸 옆 즉시 측점 표기(저장값 · 서버 검사는 m 그대로)
  for (const field of [startM, endM]) {
    const shown = createText("", "muted");
    shown.dataset.station = "";
    field.root.insertBefore(shown, field.root.lastElementChild);
    field.input.addEventListener("input", () => {
      const value = numberOrNull(field.input.value);
      shown.textContent =
        value !== null && Number.isFinite(value) && value >= 0
          ? `= ${stationLabel(value, STATION_INTERVAL_M, 1)}`
          : "";
    });
  }

  // 설계속도 = 종류별 고를 수 있는 값 · 기본 = 가장 낮은 값(20)
  const syncSpeeds = (): void => {
    const choices = SPEED_CHOICES[GRADE_CLASS[roadType.select.value]] ?? [20];
    speed.setOptions(
      choices.map((kph) => ({ value: String(kph), text: `${kph} km/h` })),
      String(Math.min(...choices)),
    );
  };

  // 이름 = B02 조합기 그대로(손대기 전 = 자동 · 고친 뒤 = 조각만 갈아 끼움)
  const composer = createNameComposer();
  const years = (): string => {
    const [a, b] = [yearStart.input.value.trim(), yearEnd.input.value.trim()];
    return b && b !== a ? `${a}~${b}` : a;
  };
  const syncName = (): void => {
    name.input.value = composer.update({
      year: years(),
      region: region.input.value,
      type: roadType.select.selectedOptions[0]?.textContent ?? "",
    });
  };
  name.input.addEventListener("input", () => composer.edit(name.input.value));
  for (const field of [yearStart, yearEnd, region]) field.input.addEventListener("input", syncName);
  roadType.select.addEventListener("change", () => (syncSpeeds(), syncName()));
  syncSpeeds();
  syncName();

  const submit = (): void => {
    const fields = [yearStart, yearEnd, region, name, startM, endM];
    fields.forEach((field) => field.setError());
    const y0 = Number.parseInt(yearStart.input.value, 10);
    const y1 = Number.parseInt(yearEnd.input.value, 10);
    const [s, e] = [numberOrNull(startM.input.value), numberOrNull(endM.input.value)];
    const errors: Array<[(typeof fields)[number], string | false]> = [
      [yearStart, !(y0 >= 2000 && y0 <= 2100) && t("Common_Validation_NumberRange")],
      [yearEnd, !(y1 >= y0 && y1 <= 2100) && t("DE_Reg_YearOrder")],
      [region, !region.input.value.trim() && t("B02_Proj_Error_Required")],
      [name, !name.input.value.trim() && t("B02_Proj_Error_Required")],
      [startM, s !== null && !(s >= 0) && t("Common_Validation_NumberRange")],
      [endM, e !== null && s !== null && !(e > s) && t("DE_Reg_ChainOrder")],
    ];
    const bad = errors.filter(([, message]) => message);
    bad.forEach(([field, message]) => field.setError(message as string));
    if (bad.length) return;
    void createGroupProject(
      "/d01/project",
      {
        project_name: name.input.value.trim(),
        project_year: y0,
        project_year_end: y1,
        region: region.input.value.trim(),
        road_type: roadType.select.value,
        design_speed_kph: Number(speed.select.value),
        start_chainage_m: s,
        end_chainage_m: e,
      },
      ROUTES.D02_PLAN_BASE,
    );
  };

  const grid = document.createElement("div");
  grid.className = "b02-proj__grid";
  grid.append(
    ...[yearStart, yearEnd, region, kind, roadType, speed, name, startM, endM].map((f) => f.root),
  );
  const actions = document.createElement("div");
  actions.className = "ui-general-block__actions b02-proj__actions";
  actions.append(
    createHelpButton(),
    createButton({
      label: t("Common_Btn_Cancel"),
      variant: "ghost",
      onClick: () => navigateTo(ROUTES.B01_ACCOUNT),
    }),
    createButton({ label: t("DE_Reg_Submit"), variant: "filled", onClick: submit }),
  );
  const layout = createGeneralLayout({
    pageClass: "b02-proj",
    title: t("DE_Reg_PlanTitle"),
    subtitle: t("DE_Reg_PlanSubtitle"),
    content: createCard({ body: [grid, actions], raised: true }),
  });
  root.append(layout.root);
}