/* =============================================================================
 * B09_Estimation_UI_Tab_Execution.ts
 * 실행예산 탭 — STmate 「시간/단위당 중기실행단가 계산 및 입력」(wM_Boq_ExecX)을 본뜸 (PLAN 12장 · 랩탑 메인).
 *
 *   - 본문 위 = 중기 실행단가 표 — 최초단가(노·재·경) · 1단위당 중기사용료 · 1단위 = 시간 ·
 *     절사 · 차액 보정 → 실행단가.
 *   - 본문 아래 = 설계 내역 줄 옆에 **실행수량** 칸 · 실행 단가 · 실행 금액.
 *   - ⚠ 값은 서버(`/estimation/execution`)가 설계 단가표를 복사해 셈 — 설계·계약은 안 바뀜.
 *   - ⚠ 실행예산 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 Money {
  material_krw: string;
  labor_krw: string;
  expense_krw: string;
  total_krw: string;
}

interface MachineEntry {
  unit_price_krw: string;
  hours_per_unit: string;
  cut_unit_krw: string;
  correction: string;
}

interface MachineRow {
  code: string;
  name: string;
  spec: string;
  design?: Money;
  execution?: Money;
  note?: string;
}

interface ExecutionRow {
  item_no: string;
  name: string;
  spec: string;
  unit: string;
  quantity: string | null;
  is_group: boolean;
  in_bill: boolean;
  amount_krw: string | null;
  execution_quantity?: string;
  execution_unit_price_krw?: string;
  execution_amount_krw?: string;
  execution_note?: string;
}

interface Settings {
  machines: Record<string, MachineEntry>;
  quantities: Record<string, string>;
}

interface ExecutionDto {
  status: string;
  message?: string;
  rows: ExecutionRow[];
  machines: MachineRow[];
  totals: { design: Money; execution: Money };
  settings: Settings;
  fields: { cut_units: string[]; corrections: { key: string; label: string }[] };
  bill_missing_count: number;
  limit_note: string;
}

const STYLE_ID = "b09-execution-styles";
function injectStyles(): void {
  if (document.getElementById(STYLE_ID)) return;
  const style = document.createElement("style");
  style.id = STYLE_ID;
  style.textContent = `
.b09ex { display: flex; flex-direction: column; gap: 8px; height: 100%; min-height: 0; }
.b09ex__meta { font-size: 12px; color: var(--color-text-secondary); }
.b09ex__warn { font-size: 12px; color: var(--color-warning-text, #8a5a00); }
.b09ex__scroll { flex: 1; overflow: auto; min-height: 0; display: flex; flex-direction: column; gap: 12px; }
.b09ex__table { border-collapse: collapse; font-size: 12px; white-space: nowrap; }
.b09ex__table th, .b09ex__table td { border: 1px solid var(--color-border); padding: 2px 6px; }
.b09ex__table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.b09ex__table tr.is-group td { font-weight: 600; }
.b09ex__table input { width: 7em; text-align: right; }
.b09ex__table input.is-changed { font-weight: 600; }
.b09ex__panel { display: flex; flex-direction: column; gap: 6px; font-size: 12px; font-variant-numeric: tabular-nums; }
`;
  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, Settings>();

function draftOf(projectId: string, data: ExecutionDto): Settings {
  let draft = drafts.get(projectId);
  if (!draft) {
    draft = {
      machines: structuredClone(data.settings.machines),
      quantities: { ...data.settings.quantities },
    };
    drafts.set(projectId, draft);
  }
  return draft;
}

function endpoint(projectId: string): string {
  return `${API_BASE_URL}/projects/${encodeURIComponent(projectId)}/estimation/execution`;
}

async function fetchExecution(projectId: string): Promise<ExecutionDto> {
  const response = await fetch(endpoint(projectId), { credentials: "include" });
  const body = (await response.json()) as ExecutionDto;
  if (!response.ok) throw new Error(body.message ?? `HTTP ${response.status}`);
  return body;
}

async function saveExecution(projectId: string, values: Settings): Promise<void> {
  const response = await fetch(endpoint(projectId), {
    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: ExecutionDto, reload: () => void): void {
  const projectId = ctx.projectId as string;
  const box = el("div", "b09ex__panel");
  box.append(
    createButton({
      label: "저장",
      onClick: async () => {
        try {
          await saveExecution(projectId, draftOf(projectId, data));
          drafts.delete(projectId);
          showToast("실행예산 저장 — 설계·계약 내역은 그대로", "success");
          reload();
        } catch (error) {
          showToast(error instanceof Error ? error.message : "저장 못 함", "error");
        }
      },
    }),
  );
  const t = data.totals;
  for (const [label, part] of [
    ["재료비", "material"],
    ["노무비", "labor"],
    ["경비", "expense"],
    ["직접공사비", "total"],
  ] as const) {
    box.append(
      el(
        "div",
        "",
        `${label} ${won(t.design[`${part}_krw`])} → ${won(t.execution[`${part}_krw`])}`,
      ),
    );
  }
  ctx.panel.append(box);
}

function input(value: string, onInput: (value: string) => void): HTMLInputElement {
  const node = el("input");
  node.type = "number";
  node.min = "0";
  node.value = value;
  node.addEventListener("input", () => onInput(node.value));
  return node;
}

function select(
  options: { key: string; label: string }[],
  value: string,
  onChange: (value: string) => void,
): HTMLSelectElement {
  const node = el("select");
  for (const option of options) {
    const item = el("option", "", option.label);
    item.value = option.key;
    node.append(item);
  }
  node.value = value;
  node.addEventListener("change", () => onChange(node.value));
  return node;
}

/** 중기 실행단가 표 — 사용료가 빈 중기는 설계 사용료 그대로. */
function drawMachines(data: ExecutionDto, draft: Settings): HTMLElement {
  const box = el("div");
  box.append(el("strong", "", `시간/단위당 중기실행단가 — 중기 ${data.machines.length}종`));
  const table = el("table", "b09ex__table");
  const head = el("tr");
  for (const label of [
    "코드",
    "명칭",
    "규격",
    "최초 노무비",
    "최초 재료비",
    "최초 경비",
    "최초 계",
    "1단위당 중기사용료(원)",
    "1단위 = 시간",
    "절사",
    "차액 보정",
    "실행 노무비",
    "실행 재료비",
    "실행 경비",
    "실행 계",
    "비고",
  ]) {
    head.append(el("th", "", label));
  }
  table.append(head);
  const cuts = data.fields.cut_units.map((unit) => ({
    key: unit,
    label: `${won(unit)}원 미만절사`,
  }));
  for (const machine of data.machines) {
    const entry = (): MachineEntry =>
      (draft.machines[machine.code] ??= {
        unit_price_krw: "",
        hours_per_unit: "",
        cut_unit_krw: "1",
        correction: "basic",
      });
    const saved = draft.machines[machine.code];
    const tr = el("tr");
    const d = machine.design;
    const x = machine.execution;
    tr.append(
      el("td", "", machine.code),
      el("td", "", machine.name),
      el("td", "", machine.spec ?? ""),
      el("td", "num", won(d?.labor_krw)),
      el("td", "num", won(d?.material_krw)),
      el("td", "num", won(d?.expense_krw)),
      el("td", "num", won(d?.total_krw)),
    );
    const cells: HTMLElement[] = [
      input(saved?.unit_price_krw ?? "", (v) => (entry().unit_price_krw = v)),
      input(saved?.hours_per_unit ?? "", (v) => (entry().hours_per_unit = v)),
      select(cuts, saved?.cut_unit_krw ?? "1", (v) => (entry().cut_unit_krw = v)),
      select(
        data.fields.corrections,
        saved?.correction ?? "basic",
        (v) => (entry().correction = v),
      ),
    ];
    for (const cell of cells) {
      const td = el("td");
      td.append(cell);
      tr.append(td);
    }
    tr.append(
      el("td", "num", won(x?.labor_krw)),
      el("td", "num", won(x?.material_krw)),
      el("td", "num", won(x?.expense_krw)),
      el("td", "num", won(x?.total_krw)),
      el("td", "", machine.note ?? ""),
    );
    table.append(tr);
  }
  box.append(table);
  return box;
}

function drawBill(data: ExecutionDto, draft: Settings): HTMLElement {
  const box = el("div");
  box.append(el("strong", "", "실행예산 내역 — 최초수량 → 실행수량"));
  const table = el("table", "b09ex__table");
  const head = el("tr");
  for (const label of [
    "공종번호",
    "명칭",
    "규격",
    "단위",
    "최초수량",
    "금액(설계)",
    "실행수량",
    "실행 단가",
    "실행 금액",
    "비고",
  ]) {
    head.append(el("th", "", label));
  }
  table.append(head);
  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", row.quantity ?? ""),
      el("td", "num", won(row.amount_krw)),
    );
    const cell = el("td");
    if (!row.is_group && row.in_bill && row.execution_quantity !== undefined) {
      const qty = input(draft.quantities[row.item_no] ?? row.execution_quantity, (v) => {
        if (v === "" || v === row.quantity) delete draft.quantities[row.item_no];
        else draft.quantities[row.item_no] = v;
      });
      qty.step = "any";
      qty.classList.toggle("is-changed", row.item_no in draft.quantities);
      cell.append(qty);
    }
    tr.append(
      cell,
      el("td", "num", won(row.execution_unit_price_krw)),
      el("td", "num", won(row.execution_amount_krw)),
      el("td", "", row.execution_note ?? ""),
    );
    table.append(tr);
  }
  box.append(table);
  return box;
}

function drawBody(ctx: B09TabContext, data: ExecutionDto): void {
  const draft = draftOf(ctx.projectId as string, data);
  const wrap = el("div", "b09ex");
  wrap.append(el("div", "b09ex__warn", `⚠ ${data.limit_note}`));
  if (data.bill_missing_count) {
    wrap.append(
      el(
        "div",
        "b09ex__warn",
        `⚠ 설계 내역 ${L("B09_Sheet_Missing")} ${data.bill_missing_count}${L("B09_Sheet_Count")} — 실행단가도 못 섬`,
      ),
    );
  }
  wrap.append(
    el("div", "b09ex__meta", "1단위당 중기사용료를 비우면 설계 사용료 그대로 — [저장]하면 반영"),
  );
  const scroll = el("div", "b09ex__scroll");
  scroll.append(drawMachines(data, draft), drawBill(data, draft));
  wrap.append(scroll);
  ctx.body.append(wrap);
}

function render(ctx: B09TabContext): void {
  injectStyles();
  if (!ctx.projectId) {
    ctx.body.append(el("div", "b09ex__meta", "프로젝트를 고르세요"));
    return;
  }
  const load = (): void => {
    ctx.body.replaceChildren(el("div", "b09ex__meta", "실행예산 계산 중…"));
    ctx.panel.replaceChildren();
    fetchExecution(ctx.projectId as string)
      .then((data) => {
        ctx.body.replaceChildren();
        drawPanel(ctx, data, load);
        drawBody(ctx, data);
      })
      .catch((error: unknown) => {
        ctx.body.replaceChildren(
          el(
            "div",
            "b09ex__warn",
            `실행예산을 세우지 못함 — ${error instanceof Error ? error.message : ""}`,
          ),
        );
      });
  };
  load();
}

export const executionTab: B09Tab = {
  key: "execution",
  label: () => L("B09_Estimation_Tab_Execution"),
  render,
};