/* =============================================================================
 * B09_Estimation_UI_Tab_Contract.ts
 * 계약내역 탭 — STmate 「당초설계 → 계약내역 변환등록」(wM_Mk_Cont)을 본뜸 (PLAN 12장 · 랩탑 메인).
 *
 *   - 좌측 = 단가 적용율 【 노 】【 재 】【 경 】 % · 적용 옵션 여섯(화면 표기 그대로) · [저장].
 *   - 본문 = 공종번호 · 명칭 · 규격 · 금액(설계) · 계약 단가·금액 · **적용제외** · 계약단가 코드.
 *   - ⚠ 값은 서버(`/estimation/contract`)가 설계 내역을 복사해 셈 — 설계는 안 바뀜.
 *   - ⚠ 계약 표본이 없어 「구조가 선다」까지만 확인된 화면 — 머리에 그 한계를 적음.
 * ========================================================================== */

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";

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

interface ContractRow {
  item_no: string;
  name: string;
  spec: string;
  unit: string;
  quantity: string | null;
  is_group: boolean;
  in_bill: boolean;
  amount_krw: string | null;
  contract_unit_price_krw?: string;
  contract_amount_krw?: string;
  contract_code?: string;
  contract_excluded?: boolean;
  contract_note?: string;
}

interface Money {
  material_krw: string;
  labor_krw: string;
  expense_krw: string;
  total_krw: string;
}

/** 계약 호표 한 장 — 설계 본표(`detail_of`)와 같은 꼴 + 계약 코드(W-). */
interface ContractSheet {
  code: string;
  design_code: string;
  name: string;
  spec: string;
  unit: string;
  material: string;
  labor: string;
  expense: string;
  total: string;
  rows: {
    name: string;
    spec: string;
    unit?: string;
    quantity: string;
    material: string;
    labor: string;
    expense: string;
    total: string;
  }[];
}

interface ContractDto {
  status: string;
  message?: string;
  rows: ContractRow[];
  unit_price_sheets: ContractSheet[];
  totals: { design: Money; contract: Money; ratio_pct: Record<string, string | null> };
  options_not_used: Record<string, string>;
  settings: Record<string, string | boolean | string[]>;
  fields: {
    rates: { key: string; label: string }[];
    options: { key: string; label: string }[];
  };
  bill_missing_count: number;
  limit_note: string;
}

const STYLE_ID = "b09-contract-styles";
function injectStyles(): void {
  if (document.getElementById(STYLE_ID)) return;
  const style = document.createElement("style");
  style.id = STYLE_ID;
  style.textContent = `
.b09ct { display: flex; flex-direction: column; gap: 8px; height: 100%; min-height: 0; }
.b09ct__meta { font-size: 12px; color: var(--color-text-secondary); }
.b09ct__warn { font-size: 12px; color: var(--color-warning-text, #8a5a00); }
.b09ct__scroll { flex: 1; overflow: auto; min-height: 0; }
.b09ct__table { border-collapse: collapse; font-size: 12px; white-space: nowrap; }
.b09ct__table th, .b09ct__table td { border: 1px solid var(--color-border); padding: 2px 6px; }
.b09ct__table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.b09ct__table tr.is-group td { font-weight: 600; }
.b09ct__table tr.is-excluded td { color: var(--color-text-secondary); }
.b09ct__panel { display: flex; flex-direction: column; gap: 6px; font-size: 12px; }
.b09ct__rates { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.b09ct__rates input { width: 4.5em; text-align: right; }
.b09ct__option { display: flex; gap: 4px; align-items: flex-start; }
.b09ct__totals { font-size: 12px; font-variant-numeric: tabular-nums; }
.b09ct__sheets { display: flex; flex-direction: column; gap: 4px; margin-top: 12px; font-size: 12px; }
.b09ct__sheets summary { cursor: pointer; }
`;
  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;
}

/** 프로젝트별 입력 캐시 — [저장] 전 값(지침 5장 · 자동저장 없음). */
const drafts = new Map<string, Record<string, string | boolean | string[]>>();

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

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

function drawPanel(ctx: B09TabContext, data: ContractDto, reload: () => void): void {
  const projectId = ctx.projectId as string;
  const draft = drafts.get(projectId) ?? { ...data.settings };
  drafts.set(projectId, draft);
  const box = el("div", "b09ct__panel");
  box.append(el("strong", "", "단가 적용율"));
  const rates = el("div", "b09ct__rates");
  for (const field of data.fields.rates) {
    const label = el("label", "b09ct__rates");
    label.append(el("span", "", `【 ${field.label} 】`));
    const input = el("input");
    input.type = "number";
    input.min = "0";
    input.step = "0.001";
    input.value = String(draft[field.key] ?? "100");
    input.addEventListener("input", () => (draft[field.key] = input.value));
    label.append(input, el("span", "", "%"));
    rates.append(label);
  }
  box.append(rates);
  for (const option of data.fields.options) {
    const row = el("label", "b09ct__option");
    const check = el("input");
    check.type = "checkbox";
    check.checked = Boolean(draft[option.key]);
    check.addEventListener("change", () => (draft[option.key] = check.checked));
    row.append(check, el("span", "", option.label));
    box.append(row);
    const unused = data.options_not_used[option.key];
    if (unused) box.append(el("span", "b09ct__warn", `⚠ ${unused}`));
  }
  box.append(
    createButton({
      label: "저장",
      onClick: async () => {
        try {
          await saveContract(projectId, draft);
          drafts.delete(projectId);
          showToast("계약 조건 저장 — 설계 내역은 그대로", "success");
          reload();
        } catch (error) {
          showToast(error instanceof Error ? error.message : "저장 못 함", "error");
        }
      },
    }),
  );
  const t = data.totals;
  const totals = el("div", "b09ct__totals");
  for (const [label, part] of [
    ["재료비", "material"],
    ["노무비", "labor"],
    ["경비", "expense"],
  ] as const) {
    totals.append(
      el(
        "div",
        "",
        `${label} ${won(t.design[`${part}_krw`])} → ${won(t.contract[`${part}_krw`])}` +
          (t.ratio_pct[part] ? ` (${t.ratio_pct[part]}%)` : ""),
      ),
    );
  }
  totals.append(
    el("div", "", `직접공사비 ${won(t.design.total_krw)} → ${won(t.contract.total_krw)}`),
  );
  box.append(totals);
  ctx.panel.append(box);
}

function drawBody(ctx: B09TabContext, data: ContractDto): void {
  const projectId = ctx.projectId as string;
  const draft = drafts.get(projectId) ?? { ...data.settings };
  drafts.set(projectId, draft);
  const excluded = new Set((draft.excluded as string[] | undefined) ?? []);
  const wrap = el("div", "b09ct");
  wrap.append(el("div", "b09ct__warn", `⚠ ${data.limit_note}`));
  if (data.bill_missing_count) {
    wrap.append(
      el(
        "div",
        "b09ct__warn",
        `⚠ 설계 내역 ${L("B09_Sheet_Missing")} ${data.bill_missing_count}${L("B09_Sheet_Count")} — 계약단가도 못 섬`,
      ),
    );
  }
  wrap.append(
    el("div", "b09ct__meta", "적용율을 제외할(ex 관급자재대..) 공정을 선택 — [저장]하면 반영"),
  );
  const scroll = el("div", "b09ct__scroll");
  const table = el("table", "b09ct__table");
  const head = el("tr");
  for (const label of [
    "공종번호",
    "명칭",
    "규격",
    "단위",
    "수량",
    "금액(설계)",
    "계약 단가",
    "계약 금액",
    "적용제외",
    "계약단가 코드",
    "비고",
  ]) {
    head.append(el("th", "", label));
  }
  table.append(head);
  for (const row of data.rows) {
    const tr = el("tr", row.is_group ? "is-group" : row.contract_excluded ? "is-excluded" : "");
    tr.append(
      el("td", "", row.item_no),
      el("td", "", row.name),
      el("td", "", row.spec ?? ""),
      el("td", "", row.unit ?? ""),
      el("td", "num", row.quantity ?? ""),
      el("td", "num", won(row.amount_krw)),
      el("td", "num", won(row.contract_unit_price_krw)),
      el("td", "num", won(row.contract_amount_krw)),
    );
    const cell = el("td");
    if (!row.is_group && row.in_bill) {
      const check = el("input");
      check.type = "checkbox";
      check.checked = excluded.has(row.item_no);
      check.addEventListener("change", () => {
        if (check.checked) excluded.add(row.item_no);
        else excluded.delete(row.item_no);
        draft.excluded = [...excluded];
      });
      cell.append(check);
    }
    tr.append(cell, el("td", "", row.contract_code ?? ""), el("td", "", row.contract_note ?? ""));
    table.append(tr);
  }
  scroll.append(table);
  if (data.unit_price_sheets.length) scroll.append(drawSheets(data.unit_price_sheets));
  wrap.append(scroll);
  ctx.body.append(wrap);
}

/** 「적용율 적용된 일위대가/산출근거」 — 설계 호표는 그대로, 계약 호표(W-)만 따로 펼침. */
function drawSheets(sheets: ContractSheet[]): HTMLElement {
  const box = el("div", "b09ct__sheets");
  box.append(el("strong", "", `계약 일위대가·산출근거 ${sheets.length}장 — 설계 호표는 그대로`));
  for (const sheet of sheets) {
    const details = el("details");
    details.append(
      el(
        "summary",
        "",
        `${sheet.code} ${sheet.name} ${sheet.spec} (설계 ${sheet.design_code}) — ` +
          `재 ${won(sheet.material)} · 노 ${won(sheet.labor)} · 경 ${won(sheet.expense)} · 계 ${won(sheet.total)}`,
      ),
    );
    const table = el("table", "b09ct__table");
    const head = el("tr");
    for (const label of ["명칭", "규격", "단위", "수량", "재료비", "노무비", "경비", "합계"]) {
      head.append(el("th", "", label));
    }
    table.append(head);
    for (const row of sheet.rows) {
      const tr = el("tr");
      tr.append(
        el("td", "", row.name),
        el("td", "", row.spec ?? ""),
        el("td", "", row.unit ?? ""),
        el("td", "num", row.quantity),
        el("td", "num", won(row.material)),
        el("td", "num", won(row.labor)),
        el("td", "num", won(row.expense)),
        el("td", "num", won(row.total)),
      );
      table.append(tr);
    }
    details.append(table);
    box.append(details);
  }
  return box;
}

function render(ctx: B09TabContext): void {
  injectStyles();
  if (!ctx.projectId) {
    ctx.body.append(el("div", "b09ct__meta", "프로젝트를 고르세요"));
    return;
  }
  const load = (): void => {
    ctx.body.replaceChildren(el("div", "b09ct__meta", "계약내역 계산 중…"));
    ctx.panel.replaceChildren();
    fetchContract(ctx.projectId as string)
      .then((data) => {
        ctx.body.replaceChildren();
        drawPanel(ctx, data, load);
        drawBody(ctx, data);
      })
      .catch((error: unknown) => {
        ctx.body.replaceChildren(
          el(
            "div",
            "b09ct__warn",
            `계약내역을 세우지 못함 — ${error instanceof Error ? error.message : ""}`,
          ),
        );
      });
  };
  load();
}

export const contractTab: B09Tab = {
  key: "contract",
  label: () => L("B09_Estimation_Tab_Contract"),
  render,
};