/* =============================================================================
 * B09_Estimation_UI_Page.ts
 * 로그인 후 09: 6차 워크플로우 (원가계산)
 *
 * 화면 규칙 (PLAN 8-13 · 화면 기획)
 *   - 3단 레이아웃: 상단 타이틀·스텝바 / 좌측 고정폭 입력 / 우측 탭 + 표.
 *   - 원가계산서 줄은 **「비목 · 금액 · 요율 · 산출근거」 네 칸**을 다 보인다.
 *     결과 숫자만 보이면 설계자가 검산을 못 한다.
 *   - **안전관리비는 A·B 두 줄을 나란히 두고 채택한 쪽을 표시**한다
 *     (실무 `안전관리비검토` 시트와 같은 서식, PLAN 8-12).
 *   - **어느 판 요율로 계산했는지**를 좌측에 남긴다 — 재현성(PLAN 9-2).
 *   - 이윤 조정액은 **설계자가 직접 넣을 때만** 반영. 목표 도급액을 넣으면 필요액을
 *     보여만 준다 (★법대로 PLAN 8-10).
 * ========================================================================== */

import { ui_locales, currentLanguageIndex } from "@ui/ui_template_locale";
import { createButton, createInputField, showToast } from "@ui/ui_template_elements";
import { createWorkflowLayout } from "@ui/ui_template_workflow_layout";
import { API_BASE_URL, CURRENT_PROJECT_ID_KEY } from "@config/config_frontend";
import { workflowSteps } from "../A00_Common/b_page_scaffold";
import { goToWorkflowStage, WORKFLOW_STEP_ROUTES } from "../A00_Common/b_workflow_nav";

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

/* -----------------------------------------------------------------------------
 * 타입 — 라우터 응답과 1:1
 * -------------------------------------------------------------------------- */

interface CostLineDto {
  key: string;
  name: string;
  base_label: string;
  base_amount_krw: string;
  rate_percent: string | null;
  flat_amount_krw: string;
  amount_krw: string;
  formula_text: string;
  note: string;
}

interface CostSheetDto {
  status: string;
  lines: CostLineDto[];
  totals: Record<string, string>;
  rate_version: { dataset_id: string; effective_date: string; sha256: string };
  notes: string[];
  suggested_profit_adjustment_krw?: string;
}

/** 좌측 입력 상태 — 화면이 들고 있는 값. 저장은 [확정] 때만. */
interface CostFormState {
  direct_material_krw: string;
  direct_labor_krw: string;
  direct_expense_krw: string;
  duration_days: string;
  owner_supplied_material_krw: string;
  procurement_fee_krw: string;
  profit_adjustment_krw: string;
  target_contract_amount_krw: string;
}

const INITIAL_FORM: CostFormState = {
  direct_material_krw: "0",
  direct_labor_krw: "0",
  direct_expense_krw: "0",
  duration_days: "183",
  owner_supplied_material_krw: "0",
  procurement_fee_krw: "0",
  profit_adjustment_krw: "0",
  target_contract_amount_krw: "",
};

/** 총계 성격의 줄 — 표에서 굵게 띄운다. */
const TOTAL_KEYS = new Set([
  "material_cost",
  "labor_cost",
  "expense",
  "net_construction_cost",
  "total_cost",
  "contract_amount",
  "grand_total",
]);

/* -----------------------------------------------------------------------------
 * 스타일 — 공통 토큰만 사용 (frontend.md §1 하드코딩 금지)
 * -------------------------------------------------------------------------- */

const STYLE_ID = "b09-estimation-styles";

function injectStyles(): void {
  if (document.getElementById(STYLE_ID)) return;
  const style = document.createElement("style");
  style.id = STYLE_ID;
  style.textContent = `
.b09-panel { display: flex; flex-direction: column; gap: var(--space-md, 12px); }
.b09-panel__group { display: flex; flex-direction: column; gap: var(--space-xs, 4px); }
.b09-panel__legend {
  font-size: var(--font-size-xs, 12px); letter-spacing: .06em;
  color: var(--color-text-secondary); text-transform: uppercase;
}
.b09-panel__readonly {
  font-size: var(--font-size-xs, 12px); color: var(--color-text-secondary);
  display: flex; justify-content: space-between; gap: var(--space-sm, 8px);
  border-bottom: 1px solid var(--color-border); padding: 2px 0;
}
.b09-panel__actions { display: flex; gap: var(--space-xs, 4px); margin-top: var(--space-sm, 8px); }
.b09-hint { font-size: var(--font-size-xs, 12px); color: var(--color-text-secondary); }

.b09-main { display: flex; flex-direction: column; gap: var(--space-sm, 8px); height: 100%; min-height: 0; }
.b09-tabs { display: flex; flex-wrap: wrap; gap: 4px; border-bottom: 1px solid var(--color-border); padding-bottom: 6px; }
.b09-tab {
  font-size: var(--font-size-xs, 12px); padding: 2px 8px; cursor: pointer;
  border: 1px solid var(--color-border); background: transparent; color: var(--color-text-secondary);
}
.b09-tab.is-active { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-surface); }
.b09-tab:disabled { cursor: not-allowed; opacity: .55; }

.b09-sheet { overflow: auto; min-height: 0; flex: 1; }
.b09-sheet table { width: 100%; border-collapse: collapse; font-size: var(--font-size-sm, 13px); }
.b09-sheet th, .b09-sheet td {
  border-bottom: 1px solid var(--color-border); padding: 4px 8px; text-align: right;
  white-space: nowrap; font-variant-numeric: tabular-nums;
}
.b09-sheet th { text-align: center; color: var(--color-text-secondary); font-weight: 600; }
.b09-sheet td.b09-left, .b09-sheet th.b09-left { text-align: left; white-space: normal; }
.b09-sheet tr.is-total td { font-weight: 600; background: var(--color-surface); }
.b09-sheet tr.is-adopted td { background: var(--color-surface); }
.b09-sheet tr.is-dropped td { color: var(--color-text-secondary); text-decoration: line-through; }
.b09-empty { padding: var(--space-lg, 16px); color: var(--color-text-secondary); font-size: var(--font-size-sm, 13px); }
`;
  document.head.append(style);
}

/* -----------------------------------------------------------------------------
 * 표 그리기
 * -------------------------------------------------------------------------- */

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

function buildCostSheetTable(sheet: CostSheetDto): HTMLElement {
  const wrap = document.createElement("div");
  wrap.className = "b09-sheet";

  const table = document.createElement("table");
  const thead = document.createElement("thead");
  const headRow = document.createElement("tr");
  const headers: Array<[string, boolean]> = [
    [L("B09_Estimation_Col_Item"), true],
    [L("B09_Estimation_Col_Amount"), false],
    [L("B09_Estimation_Col_Rate"), false],
    [L("B09_Estimation_Col_Basis"), true],
    [L("B09_Estimation_Col_Note"), true],
  ];
  for (const [text, left] of headers) {
    const th = document.createElement("th");
    th.textContent = text;
    if (left) th.className = "b09-left";
    headRow.append(th);
  }
  thead.append(headRow);
  table.append(thead);

  const tbody = document.createElement("tbody");
  for (const line of sheet.lines) {
    const tr = document.createElement("tr");
    if (TOTAL_KEYS.has(line.key)) tr.classList.add("is-total");
    if (line.note === L("B09_Estimation_Adopted")) tr.classList.add("is-adopted");
    if (line.note === L("B09_Estimation_NotAdopted")) tr.classList.add("is-dropped");

    const name = document.createElement("td");
    name.className = "b09-left";
    name.textContent = line.name;

    const amount = document.createElement("td");
    amount.textContent = formatWon(line.amount_krw);

    const rate = document.createElement("td");
    rate.textContent = line.rate_percent === null ? "" : `${line.rate_percent}%`;

    const basis = document.createElement("td");
    basis.className = "b09-left";
    basis.textContent = line.formula_text;

    const note = document.createElement("td");
    note.className = "b09-left";
    note.textContent = line.note;

    tr.append(name, amount, rate, basis, note);
    tbody.append(tr);
  }
  table.append(tbody);
  wrap.append(table);
  return wrap;
}

/* -----------------------------------------------------------------------------
 * 좌측 패널
 * -------------------------------------------------------------------------- */

interface PanelHandles {
  root: HTMLElement;
  rateVersionBox: HTMLElement;
  hintBox: HTMLElement;
}

function buildSidePanel(
  form: CostFormState,
  onRecalc: () => void,
  onConfirm: () => void,
): PanelHandles {
  const root = document.createElement("div");
  root.className = "b09-panel";

  const addGroup = (
    legendKey: keyof typeof ui_locales,
    fields: Array<[keyof CostFormState, keyof typeof ui_locales]>,
  ): void => {
    const group = document.createElement("div");
    group.className = "b09-panel__group";
    const legend = document.createElement("span");
    legend.className = "b09-panel__legend";
    legend.textContent = L(legendKey);
    group.append(legend);
    for (const [field, labelKey] of fields) {
      const handle = createInputField({
        label: L(labelKey),
        type: "number",
        min: 0,
        value: form[field],
        onInput: (value) => {
          form[field] = value;
        },
      });
      group.append(handle.root);
    }
    root.append(group);
  };

  addGroup("B09_Estimation_Group_Condition", [
    ["direct_material_krw", "B09_Estimation_Field_DirectMaterial"],
    ["direct_labor_krw", "B09_Estimation_Field_DirectLabor"],
    ["direct_expense_krw", "B09_Estimation_Field_DirectExpense"],
    ["duration_days", "B09_Estimation_Field_Duration"],
  ]);

  // 요율 판 — 읽기 전용. 「어느 판으로 계산했나」가 화면에 남아야 재현성이 선다.
  const rateGroup = document.createElement("div");
  rateGroup.className = "b09-panel__group";
  const rateLegend = document.createElement("span");
  rateLegend.className = "b09-panel__legend";
  rateLegend.textContent = L("B09_Estimation_Group_RateVersion");
  const rateVersionBox = document.createElement("div");
  rateGroup.append(rateLegend, rateVersionBox);
  root.append(rateGroup);

  addGroup("B09_Estimation_Group_Supplied", [
    ["owner_supplied_material_krw", "B09_Estimation_Field_OwnerMaterial"],
    ["procurement_fee_krw", "B09_Estimation_Field_ProcurementFee"],
  ]);

  addGroup("B09_Estimation_Group_Profit", [
    ["profit_adjustment_krw", "B09_Estimation_Field_ProfitAdjust"],
    ["target_contract_amount_krw", "B09_Estimation_Field_TargetContract"],
  ]);

  const hintBox = document.createElement("div");
  hintBox.className = "b09-hint";
  root.append(hintBox);

  const actions = document.createElement("div");
  actions.className = "b09-panel__actions";
  actions.append(
    createButton({ label: L("B09_Estimation_Btn_Recalc"), variant: "filled", onClick: onRecalc }),
    createButton({ label: L("B09_Estimation_Btn_Confirm"), onClick: onConfirm }),
  );
  root.append(actions);

  return { root, rateVersionBox, hintBox };
}

function renderRateVersion(box: HTMLElement, sheet: CostSheetDto | null): void {
  box.replaceChildren();
  if (!sheet) return;
  const rows: Array<[string, string]> = [
    ["적용일", sheet.rate_version.effective_date || "—"],
    ["지문", sheet.rate_version.sha256 ? `${sheet.rate_version.sha256.slice(0, 8)}…` : "—"],
  ];
  for (const [label, value] of rows) {
    const row = document.createElement("div");
    row.className = "b09-panel__readonly";
    const left = document.createElement("span");
    left.textContent = label;
    const right = document.createElement("span");
    right.textContent = value;
    row.append(left, right);
    box.append(row);
  }
}

/* -----------------------------------------------------------------------------
 * 탭
 * -------------------------------------------------------------------------- */

const TAB_KEYS: Array<[string, keyof typeof ui_locales, boolean]> = [
  ["cost_sheet", "B09_Estimation_Tab_CostSheet", true],
  ["boq", "B09_Estimation_Tab_Boq", false],
  ["unit_price", "B09_Estimation_Tab_UnitPrice", false],
  ["price_basis", "B09_Estimation_Tab_PriceBasis", false],
  ["machine", "B09_Estimation_Tab_Machine", false],
  ["duration", "B09_Estimation_Tab_Duration", false],
  ["supply", "B09_Estimation_Tab_Supply", false],
  ["base_data", "B09_Estimation_Tab_BaseData", false],
];

function buildTabs(active: string, onSelect: (key: string) => void): HTMLElement {
  const bar = document.createElement("div");
  bar.className = "b09-tabs";
  for (const [key, labelKey, enabled] of TAB_KEYS) {
    const button = document.createElement("button");
    button.type = "button";
    button.className = "b09-tab";
    button.dataset.tab = key;
    button.textContent = L(labelKey);
    button.disabled = !enabled;
    if (!enabled) button.title = L("B09_Estimation_Tab_Pending");
    if (key === active) button.classList.add("is-active");
    button.addEventListener("click", () => onSelect(key));
    bar.append(button);
  }
  return bar;
}

/* -----------------------------------------------------------------------------
 * API
 * -------------------------------------------------------------------------- */

function toRequestBody(form: CostFormState): Record<string, unknown> {
  const num = (value: string): string => (value.trim() === "" ? "0" : value.trim());
  const body: Record<string, unknown> = {
    direct_material_krw: num(form.direct_material_krw),
    direct_labor_krw: num(form.direct_labor_krw),
    direct_expense_krw: num(form.direct_expense_krw),
    duration_days: Number(num(form.duration_days)),
    owner_supplied_material_krw: num(form.owner_supplied_material_krw),
    procurement_fee_krw: num(form.procurement_fee_krw),
    profit_adjustment_krw: num(form.profit_adjustment_krw),
  };
  if (form.target_contract_amount_krw.trim() !== "") {
    body.target_contract_amount_krw = form.target_contract_amount_krw.trim();
  }
  return body;
}

async function fetchCostSheet(projectId: string, form: CostFormState): Promise<CostSheetDto> {
  const response = await fetch(
    `${API_BASE_URL}/projects/${encodeURIComponent(projectId)}/estimation/cost`,
    {
      method: "POST",
      credentials: "include",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(toRequestBody(form)),
    },
  );
  if (!response.ok) throw new Error(`estimation cost failed: ${response.status}`);
  return (await response.json()) as CostSheetDto;
}

async function confirmEstimationStage(projectId: string): Promise<void> {
  const response = await fetch(
    `${API_BASE_URL}/projects/${encodeURIComponent(projectId)}/estimation/confirm`,
    { method: "POST", credentials: "include" },
  );
  if (!response.ok) throw new Error(`estimation confirm failed: ${response.status}`);
}

/* -----------------------------------------------------------------------------
 * 페이지 진입점
 * -------------------------------------------------------------------------- */

export async function renderB09Estimation(root: HTMLElement): Promise<void> {
  injectStyles();
  const projectId = localStorage.getItem(CURRENT_PROJECT_ID_KEY);
  const form: CostFormState = { ...INITIAL_FORM };
  let activeTab = "cost_sheet";
  let sheet: CostSheetDto | null = null;

  const main = document.createElement("div");
  main.className = "b09-main";
  const body = document.createElement("div");
  body.style.flex = "1";
  body.style.minHeight = "0";
  body.style.display = "flex";
  body.style.flexDirection = "column";

  const drawBody = (): void => {
    body.replaceChildren();
    if (activeTab !== "cost_sheet") {
      const empty = document.createElement("div");
      empty.className = "b09-empty";
      empty.textContent = L("B09_Estimation_Tab_Pending");
      body.append(empty);
      return;
    }
    if (!sheet) {
      const empty = document.createElement("div");
      empty.className = "b09-empty";
      empty.textContent = L("B09_Estimation_Btn_Recalc");
      body.append(empty);
      return;
    }
    body.append(buildCostSheetTable(sheet));
    for (const note of sheet.notes) {
      const line = document.createElement("div");
      line.className = "b09-hint";
      line.textContent = note;
      body.append(line);
    }
  };

  const drawTabs = (): void => {
    const bar = buildTabs(activeTab, (key) => {
      activeTab = key;
      drawTabs();
      drawBody();
    });
    const old = main.querySelector(".b09-tabs");
    if (old) old.replaceWith(bar);
    else main.prepend(bar);
  };

  const panel = buildSidePanel(
    form,
    async () => {
      if (!projectId) return;
      try {
        sheet = await fetchCostSheet(projectId, form);
        renderRateVersion(panel.rateVersionBox, sheet);
        panel.hintBox.textContent =
          sheet.suggested_profit_adjustment_krw && sheet.suggested_profit_adjustment_krw !== "0"
            ? `${L("B09_Estimation_Suggest_Adjust")} ${formatWon(sheet.suggested_profit_adjustment_krw)}`
            : "";
        drawBody();
      } catch {
        showToast(L("B09_Estimation_Calc_Failed"), "error");
      }
    },
    async () => {
      if (!projectId) return;
      try {
        await confirmEstimationStage(projectId);
        showToast(L("B09_Estimation_Confirm_Success"), "success");
        goToWorkflowStage(projectId, WORKFLOW_STEP_ROUTES[6]);
      } catch {
        showToast(L("B09_Estimation_Confirm_Failed"), "error");
      }
    },
  );

  main.append(body);
  drawTabs();
  drawBody();

  const layout = createWorkflowLayout({
    title: L("B09_Estimation_Title"),
    steps: workflowSteps(),
    activeStep: 6,
    leftPanel: panel.root,
    mainContent: main,
    routes: WORKFLOW_STEP_ROUTES,
    onStepClick: (stepIndex) => {
      if (projectId) goToWorkflowStage(projectId, WORKFLOW_STEP_ROUTES[stepIndex]);
    },
  });
  root.append(layout.root);
}