/* =============================================================================
 * B09_Estimation_UI_Tab_Completion.ts
 * 준공 탭 — STmate 「준공조서(을/병)」의 「계약금액 | 준공금액」 두 열을 본뜸 (PLAN 12장 · 랩탑 메인).
 *
 *   - 위 = 제잡비 줄 + 합계 줄(직접공사비 · 제잡비 계 · 공급가액 · 부가세 · 기성금액).
 *   - 아래 = 공종별 계약금액 | 준공금액.
 *   - ⚠ 준공 별도 계산 규칙은 미확인 — 서버(`/estimation/completion`)가 기성 마지막 회차 누계를
 *     옮기기만 함. 입력 칸·[저장] 없음(기성 탭에서 고침).
 * ========================================================================== */

import { ui_locales, currentLanguageIndex } from "@ui/ui_template_locale";
import { API_BASE_URL } from "@config/config_frontend";
import type { B09Tab, B09TabContext } from "./B09_Estimation_UI_Shell_Types";

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

interface CompletionRow {
  item_no: string;
  name: string;
  spec: string | null;
  unit: string | null;
  is_group: boolean;
  contract_amount_krw: string | null;
  completion_amount_krw: string | null;
}

interface CompletionLine {
  key: string;
  name: string;
  total: boolean;
  contract_krw: string;
  completion_krw: string | null;
  completion_pct: string | null;
}

interface CompletionDto {
  status: string;
  message?: string;
  rows: CompletionRow[];
  lines: CompletionLine[];
  from_round: number;
  notes: string[];
  limit_note: string;
}

const STYLE_ID = "b09-completion-styles";
function injectStyles(): void {
  if (document.getElementById(STYLE_ID)) return;
  const style = document.createElement("style");
  style.id = STYLE_ID;
  style.textContent = `
.b09cp { display: flex; flex-direction: column; gap: 8px; height: 100%; min-height: 0; }
.b09cp__meta { font-size: 12px; color: var(--color-text-secondary); }
.b09cp__warn { font-size: 12px; color: var(--color-warning-text, #8a5a00); }
.b09cp__scroll { flex: 1; overflow: auto; min-height: 0; display: flex; flex-direction: column; gap: 12px; }
.b09cp__table { border-collapse: collapse; font-size: 12px; white-space: nowrap; }
.b09cp__table th, .b09cp__table td { border: 1px solid var(--color-border); padding: 2px 6px; }
.b09cp__table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.b09cp__table tr.is-total td, .b09cp__table tr.is-group td { font-weight: 600; }
`;
  document.head.append(style);
}

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;
}

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

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

function table(headers: string[]): HTMLTableElement {
  const node = el("table", "b09cp__table");
  const head = el("tr");
  for (const label of headers) head.append(el("th", "", label));
  node.append(head);
  return node;
}

function draw(ctx: B09TabContext, data: CompletionDto): void {
  const wrap = el("div", "b09cp");
  wrap.append(el("div", "b09cp__warn", `⚠ ${data.limit_note}`));
  for (const note of data.notes) wrap.append(el("div", "b09cp__warn", `⚠ ${note}`));
  wrap.append(
    el(
      "div",
      "b09cp__meta",
      data.from_round
        ? `준공금액 = 기성 ${data.from_round}회(마지막 회차) 누계 — 고칠 곳은 기성 탭`
        : "기성 탭에서 회차를 넣으면 그 누계가 준공금액으로 옮겨짐",
    ),
  );
  const scroll = el("div", "b09cp__scroll");

  const summary = table(["명칭", "계약금액", "준공금액", "준공(%)"]);
  for (const line of data.lines) {
    const tr = el("tr", line.total ? "is-total" : "");
    tr.append(
      el("td", "", line.name),
      el("td", "num", won(line.contract_krw)),
      el("td", "num", won(line.completion_krw)),
      el("td", "num", line.completion_pct ? `${line.completion_pct}%` : ""),
    );
    summary.append(tr);
  }
  const bill = table(["공종번호", "명칭", "규격", "단위", "계약금액", "준공금액"]);
  for (const row of data.rows) {
    const tr = el("tr", row.is_group ? "is-group" : "");
    tr.append(
      el("td", "", row.item_no),
      el("td", "", row.name),
      el("td", "", row.spec ?? ""),
      el("td", "", row.unit ?? ""),
      el("td", "num", won(row.contract_amount_krw)),
      el("td", "num", won(row.completion_amount_krw)),
    );
    bill.append(tr);
  }
  const top = el("div");
  top.append(el("strong", "", "준공조서 — 계약금액 | 준공금액"), summary);
  const bottom = el("div");
  bottom.append(el("strong", "", "공종별"), bill);
  scroll.append(top, bottom);
  wrap.append(scroll);
  ctx.body.append(wrap);
}

function render(ctx: B09TabContext): void {
  injectStyles();
  if (!ctx.projectId) {
    ctx.body.append(el("div", "b09cp__meta", "프로젝트를 고르세요"));
    return;
  }
  ctx.body.replaceChildren(
    el("div", "b09cp__meta", `${L("B09_Estimation_Tab_Completion")} 계산 중…`),
  );
  fetchCompletion(ctx.projectId)
    .then((data) => {
      ctx.body.replaceChildren();
      draw(ctx, data);
    })
    .catch((error: unknown) => {
      ctx.body.replaceChildren(
        el(
          "div",
          "b09cp__warn",
          `준공을 세우지 못함 — ${error instanceof Error ? error.message : ""}`,
        ),
      );
    });
}

export const completionTab: B09Tab = {
  key: "completion",
  label: () => L("B09_Estimation_Tab_Completion"),
  render,
};