/* =============================================================================
 * B09_Estimation_UI_Tab_CostSheet.ts
 * 원가계산서 탭 — STmate 「제잡비 계산」(wM_KanJub) 일반형식을 본뜸 (PLAN 12장 · 랩탑 메인).
 *
 *   - 좌측 = 기준 입력판: 번호·제목은 DFM `TWM_KANJUB` 그대로. 엔진이 받는 칸만 엶.
 *   - 본문 = 서식(점선 라벨 + 오른쪽 금액) · 아래 형식 탭(일반형식만 켜짐) · 상태줄(직재·직노·산경·이윤).
 *   - ⚠ 값은 서버(`/estimation/cost-sheet`)가 냄 — 여기는 그리기·입력만(지침 5장).
 *   - 입력은 캐시(모듈 안)에만 쌓이고 [저장]에서 정본으로 감 · 자동저장 없음.
 * ========================================================================== */

import { ui_locales, currentLanguageIndex } from "@ui/ui_template_locale";
import { createButton, showToast } from "@ui/ui_template_elements";
import { API_BASE_URL } from "@config/config_frontend";
import type { B09Tab, B09TabContext } from "./B09_Estimation_UI_Shell_Types";
import { injectSheetStyles, unconfirmedBadge } from "./B09_Estimation_UI_Sheet";

function L(key: keyof typeof ui_locales): string {
  return ui_locales[key][currentLanguageIndex];
}

interface SheetRow {
  key: string;
  mark: string;
  label: string;
  level: number;
  formula: string;
  rate_percent: string | null;
  amount_krw: string;
  note: string;
  total: boolean;
}

interface FieldOption {
  value: string;
  label: string;
}

interface CostSheetDto {
  status: string;
  message?: string;
  rows: SheetRow[];
  status_line: Record<string, string>;
  settings: Record<string, string | number>;
  fields: {
    work_types: { key: string; label: string }[];
    amounts: { key: string; label: string }[];
    options: Record<string, FieldOption[]>;
  };
  waste_note: string;
  bill_missing_count: number;
  bill_unconfirmed_count: number;
  rate_version: { dataset_id: string; effective_date: string };
  notes: string[];
}

/** DFM 기준 입력판 첫 칸 「제잡비계산형식」 선택지 그대로. 지금은 「일반 형식」만 엶. */
const FORMS = [
  "일반 형식",
  "토지개발공사 형식",
  "인천상수도 형식",
  "수자원공사 형식",
  "지역난방공사 형식",
  "고용개선지원(서울)",
];
/** DFM 본문 아래 탭 이름 그대로. */
const FORM_TABS = ["일반형식", "수공형식", "실적일반", "실적수공"];

const STYLE_ID = "b09-cost-sheet-styles";
function injectStyles(): void {
  if (document.getElementById(STYLE_ID)) return;
  const style = document.createElement("style");
  style.id = STYLE_ID;
  style.textContent = `
.b09cs { display: flex; flex-direction: column; gap: 8px; height: 100%; min-height: 0; }
.b09cs__head { display: flex; flex-wrap: wrap; gap: 8px; align-items: baseline; }
.b09cs__title { font-weight: 600; }
.b09cs__meta { font-size: 12px; color: var(--color-text-secondary); }
.b09cs__warn { font-size: 12px; color: var(--color-warning-text, #8a5a00); }
.b09cs__sheet { flex: 1; overflow: auto; min-height: 0; border: 1px solid var(--color-border); padding: 8px 12px; }
.b09cs__line { display: flex; align-items: baseline; gap: 6px; font-size: 13px; line-height: 1.9; }
.b09cs__mark { flex: 0 0 2.4em; text-align: right; }
.b09cs__label { flex: 1; min-width: 0; display: flex; gap: 4px; overflow: hidden; white-space: nowrap; }
.b09cs__label::after { content: ""; flex: 1; border-bottom: 1px dotted var(--color-border); margin-bottom: 4px; }
.b09cs__formula { color: var(--color-text-secondary); font-size: 12px; overflow: hidden; text-overflow: ellipsis; }
.b09cs__amount { flex: 0 0 11em; text-align: right; font-variant-numeric: tabular-nums; }
.b09cs__line--total { font-weight: 600; }
.b09cs__line--total .b09cs__amount { flex-basis: 12.5em; }
.b09cs__tabs { display: flex; gap: 2px; border-top: 1px solid var(--color-border); padding-top: 4px; }
.b09cs__tab { font-size: 12px; padding: 2px 10px; border: 1px solid var(--color-border); border-top: none; background: none; }
.b09cs__tab[aria-selected="true"] { font-weight: 600; background: var(--color-surface, #fff); }
.b09cs__status { display: flex; gap: 16px; font-size: 12px; font-variant-numeric: tabular-nums; }
.b09cs__panel { display: flex; flex-direction: column; gap: 6px; }
.b09cs__field { display: flex; flex-direction: column; gap: 2px; font-size: 12px; }
.b09cs__field select, .b09cs__field input { width: 100%; }
.b09cs__group { font-size: 12px; font-weight: 600; margin-top: 6px; }
.b09cs__buttons { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
`;
  document.head.append(style);
}

function won(value: string): string {
  const n = Number(value);
  return Number.isFinite(n) ? n.toLocaleString("ko-KR") : value;
}

function el<K extends keyof HTMLElementTagNameMap>(
  tag: K,
  className = "",
  text = "",
): HTMLElementTagNameMap[K] {
  const node = document.createElement(tag);
  if (className) node.className = className;
  if (text) node.textContent = text;
  return node;
}

/** 프로젝트별 입력 캐시 — 탭을 다시 골라도 [저장] 전 값이 남음. */
const drafts = new Map<string, Record<string, string>>();

async function fetchSheet(projectId: string): Promise<CostSheetDto> {
  const response = await fetch(
    `${API_BASE_URL}/projects/${encodeURIComponent(projectId)}/estimation/cost-sheet`,
    { credentials: "include" },
  );
  const body = (await response.json()) as CostSheetDto;
  if (!response.ok) throw new Error(body.message ?? `HTTP ${response.status}`);
  return body;
}

async function saveSheet(projectId: string, values: Record<string, string>): Promise<void> {
  const response = await fetch(
    `${API_BASE_URL}/projects/${encodeURIComponent(projectId)}/estimation/cost-sheet`,
    {
      method: "PUT",
      credentials: "include",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(values),
    },
  );
  if (!response.ok) throw new Error(`HTTP ${response.status}`);
}

function selectField(
  label: string,
  value: string,
  options: { value: string; label: string; disabled?: boolean }[],
  onChange: (value: string) => void,
): HTMLElement {
  const wrap = el("label", "b09cs__field");
  wrap.append(el("span", "", label));
  const select = el("select");
  for (const option of options) {
    const node = el("option", "", option.label);
    node.value = option.value;
    node.disabled = Boolean(option.disabled);
    select.append(node);
  }
  select.value = value;
  select.addEventListener("change", () => onChange(select.value));
  wrap.append(select);
  return wrap;
}

function numberField(label: string, value: string, onInput: (value: string) => void): HTMLElement {
  const wrap = el("label", "b09cs__field");
  wrap.append(el("span", "", label));
  const input = el("input");
  input.type = "number";
  input.min = "0";
  input.value = value;
  input.addEventListener("input", () => onInput(input.value));
  wrap.append(input);
  return wrap;
}

function drawPanel(ctx: B09TabContext, sheet: CostSheetDto, reload: () => void): void {
  const projectId = ctx.projectId as string;
  const draft =
    drafts.get(projectId) ??
    Object.fromEntries(Object.entries(sheet.settings).map(([k, v]) => [k, String(v)]));
  drafts.set(projectId, draft);
  const box = el("div", "b09cs__panel");
  box.append(el("div", "b09cs__group", "기준 입력"));
  box.append(
    selectField(
      "제잡비계산형식 :",
      FORMS[0],
      FORMS.map((name, i) => ({
        value: name,
        label: i ? `${name} (준비 중)` : name,
        disabled: i > 0,
      })),
      () => undefined,
    ),
  );
  const workType = (key: string) => sheet.fields.work_types.find((f) => f.key === key);
  const typeSelect = (key: string) => {
    const field = workType(key);
    if (!field) return;
    box.append(
      selectField(field.label + " :", draft[key] ?? "", sheet.fields.options[key] ?? [], (v) => {
        draft[key] = v;
      }),
    );
  };
  typeSelect("work_type_indirect_labor");
  box.append(
    numberField("3.공사의기간(일) :", draft.duration_days ?? "", (v) => {
      draft.duration_days = v;
    }),
  );
  for (const field of sheet.fields.amounts.slice(0, 2)) {
    box.append(
      numberField(field.label + " :", draft[field.key] ?? "", (v) => (draft[field.key] = v)),
    );
  }
  typeSelect("work_type_safety");
  typeSelect("environment_work_type");
  typeSelect("equipment_guarantee_work_type");
  box.append(el("div", "b09cs__group", "계산/인쇄 설정"));
  for (const field of sheet.fields.amounts.slice(2)) {
    box.append(
      numberField(field.label + " :", draft[field.key] ?? "", (v) => (draft[field.key] = v)),
    );
  }

  const buttons = el("div", "b09cs__buttons");
  buttons.append(
    createButton({
      label: "제비율표",
      variant: "ghost",
      onClick: () => ctx.open("rate_table"),
    }),
    createButton({
      label: "다시 계산",
      variant: "ghost",
      onClick: () => {
        drafts.delete(projectId);
        reload();
      },
    }),
    createButton({
      label: "저장",
      onClick: async () => {
        try {
          await saveSheet(projectId, draft);
          drafts.delete(projectId);
          showToast("원가계산서 기준 저장", "success");
          reload();
        } catch (error) {
          showToast(error instanceof Error ? error.message : "저장 못 함", "error");
        }
      },
    }),
  );
  box.append(buttons);
  ctx.panel.append(box);
}

function drawBody(ctx: B09TabContext, sheet: CostSheetDto): void {
  const wrap = el("div", "b09cs");
  const head = el("div", "b09cs__head");
  head.append(
    el("span", "b09cs__title", "제잡비 계산 — 일반형식"),
    el(
      "span",
      "b09cs__meta",
      `요율 판 ${sheet.rate_version.effective_date} · 직접비는 설계내역서 합계`,
    ),
  );
  // 표현은 내역서·구조물도와 한 벌(「금액을 못 세운 줄 N건」 · 「미확정 N건」 배지).
  if (sheet.bill_missing_count) {
    head.append(
      el(
        "span",
        "b09cs__warn",
        `⚠ 내역서 ${L("B09_Sheet_Missing")} ${sheet.bill_missing_count}${L("B09_Sheet_Count")} — 직접비가 덜 섬`,
      ),
    );
  }
  if (sheet.bill_unconfirmed_count) head.append(unconfirmedBadge(sheet.bill_unconfirmed_count));
  if (sheet.waste_note) head.append(el("span", "b09cs__meta", `폐기물처리비: ${sheet.waste_note}`));
  wrap.append(head);

  const body = el("div", "b09cs__sheet");
  for (const row of sheet.rows) {
    const line = el("div", `b09cs__line${row.total ? " b09cs__line--total" : ""}`);
    line.style.paddingLeft = `${row.level * 1.2}em`;
    line.append(el("span", "b09cs__mark", row.mark));
    const label = el("span", "b09cs__label");
    label.append(el("span", "", row.label));
    if (row.formula) label.append(el("span", "b09cs__formula", `<${row.formula}>`));
    label.title = [row.formula, row.note].filter(Boolean).join(" · ");
    line.append(label, el("span", "b09cs__amount", won(row.amount_krw)));
    body.append(line);
  }
  wrap.append(body);

  const tabs = el("div", "b09cs__tabs");
  FORM_TABS.forEach((name, i) => {
    const tab = el("button", "b09cs__tab", name);
    tab.setAttribute("aria-selected", String(i === 0));
    tab.disabled = i > 0;
    if (i > 0) tab.title = "준비 중 — 일반형식부터 세움";
    tabs.append(tab);
  });
  wrap.append(tabs);

  const status = el("div", "b09cs__status");
  for (const [name, value] of Object.entries(sheet.status_line)) {
    status.append(el("span", "", `${name}: ${won(value)}`));
  }
  wrap.append(status);
  for (const note of sheet.notes) wrap.append(el("div", "b09cs__meta", note));
  ctx.body.append(wrap);
}

function render(ctx: B09TabContext): void {
  injectStyles();
  injectSheetStyles();
  if (!ctx.projectId) {
    ctx.body.append(el("div", "b09cs__meta", "프로젝트를 고르세요"));
    return;
  }
  const load = (): void => {
    ctx.body.replaceChildren(el("div", "b09cs__meta", "원가계산서 계산 중…"));
    ctx.panel.replaceChildren();
    fetchSheet(ctx.projectId as string)
      .then((sheet) => {
        ctx.body.replaceChildren();
        drawPanel(ctx, sheet, load);
        drawBody(ctx, sheet);
      })
      .catch((error: unknown) => {
        ctx.body.replaceChildren(
          el(
            "div",
            "b09cs__warn",
            `원가계산서를 세우지 못함 — ${error instanceof Error ? error.message : ""}`,
          ),
        );
      });
  };
  load();
}

export const costSheetTab: B09Tab = {
  key: "cost_sheet",
  label: () => L("B09_Estimation_Tab_CostSheet"),
  render,
};