/* =============================================================================
 * B09_Estimation_UI_Tab_Progress.ts
 * 기성 탭 — STmate 「기성 제잡비 계산서」(wM_KanJub_K)와 기성내역서(계약|전회|금회|누계)를 본뜸 (PLAN 12장 · 랩탑 메인).
 *
 *   - 좌측 = 회차 고르기 · [회차 추가] · 부가세 방식 넷(직접입력이면 금액) · [저장].
 *   - 본문 위 = 기성 제잡비 계산서 — 도급액 · 계약잡비율 · 전회/금회/누계 금액과 율.
 *   - 본문 아래 = 기성내역 — 계약 · 전회 · **금회 기성수량 칸** · 누계 · 기성(%) · 잔량.
 *   - ⚠ 값은 서버(`/estimation/progress`)가 계약내역·계약 원가계산서에서 파생 — 계약은 안 바뀜.
 *   - ⚠ 기성 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];
}

type Column = "previous" | "current" | "cumulative";
const COLUMNS: [Column, string, string][] = [
  ["previous", "전회금액", "전율"],
  ["current", "금회금액", "금율"],
  ["cumulative", "누계금액", "누율"],
];

interface Round {
  quantities: Record<string, string>;
  vat_mode: string;
  vat_manual_krw: string;
  supply_cut_krw: string;
  total_cut_krw: string;
  profit_manual_krw: string;
  /** 사정 — 뜻 미확인이라 칸만(계산에 안 씀). */
  assessed: Record<string, string>;
}

type Override = { rate_pct: string; reason: string };
type Overrides = Record<string, Override>;
type Choice = { key: string; label: string };

interface AmountRow {
  key: string;
  name: string;
  contract_krw: string;
  contract_ratio_pct?: string | null;
  default_ratio_pct?: string;
  override?: Override | null;
  [column: string]: string | null | undefined | Override;
}

interface ProgressRow {
  item_no: string;
  name: string;
  spec: string;
  unit: string;
  quantity: string | null;
  is_group: boolean;
  in_bill: boolean;
  contract_amount_krw?: string;
  progress_pct?: string | null;
  progress_remaining_quantity?: string;
  progress_note?: string;
  [column: string]: string | boolean | null | undefined;
}

interface ProgressDto {
  status: string;
  message?: string;
  rows: ProgressRow[];
  items: AmountRow[];
  summary: AmountRow[];
  contract_overhead_ratio_pct: string | null;
  round: number;
  round_count: number;
  notes: string[];
  settings: { rounds: Round[]; rate_overrides: Overrides };
  fields: { vat: Choice[]; supply_cut: Choice[]; total_cut: Choice[] };
  limit_note: string;
}

const STYLE_ID = "b09-progress-styles";
function injectStyles(): void {
  if (document.getElementById(STYLE_ID)) return;
  const style = document.createElement("style");
  style.id = STYLE_ID;
  style.textContent = `
.b09pg { display: flex; flex-direction: column; gap: 8px; height: 100%; min-height: 0; }
.b09pg__meta { font-size: 12px; color: var(--color-text-secondary); }
.b09pg__warn { font-size: 12px; color: var(--color-warning-text, #8a5a00); }
.b09pg__scroll { flex: 1; overflow: auto; min-height: 0; display: flex; flex-direction: column; gap: 12px; }
.b09pg__table { border-collapse: collapse; font-size: 12px; white-space: nowrap; }
.b09pg__table th, .b09pg__table td { border: 1px solid var(--color-border); padding: 2px 6px; }
.b09pg__table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.b09pg__table tr.is-group td, .b09pg__table tr.is-total td { font-weight: 600; }
.b09pg__table input { width: 7em; text-align: right; }
.b09pg__panel { display: flex; flex-direction: column; gap: 6px; font-size: 12px; }
.b09pg__panel label { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
`;
  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 | boolean | null | undefined): string {
  if (value === null || value === undefined || value === "" || typeof value === "boolean")
    return "";
  const n = Number(value);
  return Number.isFinite(n) ? n.toLocaleString("ko-KR") : value;
}

function pct(value: string | boolean | null | undefined): string {
  return typeof value === "string" ? `${value}%` : "";
}

/** 프로젝트별 입력 캐시 — [저장] 전 값(지침 5장 · 자동저장 없음). 고른 회차도 함께. */
const drafts = new Map<string, { rounds: Round[]; overrides: Overrides; round: number }>();

function draftOf(projectId: string, data: ProgressDto) {
  let draft = drafts.get(projectId);
  if (!draft) {
    draft = {
      rounds: structuredClone(data.settings.rounds),
      overrides: structuredClone(data.settings.rate_overrides),
      round: data.round,
    };
    drafts.set(projectId, draft);
  }
  return draft;
}

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

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

async function saveProgress(
  projectId: string,
  rounds: Round[],
  overrides: Overrides,
): Promise<void> {
  const response = await fetch(endpoint(projectId), {
    method: "PUT",
    credentials: "include",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ rounds, rate_overrides: overrides }),
  });
  const body = (await response.json()) as { message?: string };
  if (!response.ok) throw new Error(body.message ?? `HTTP ${response.status}`);
}

function choiceSelect(choices: Choice[], value: string, onChange: (v: string) => void) {
  const node = el("select");
  for (const choice of choices) {
    const option = el("option", "", choice.label);
    option.value = choice.key;
    node.append(option);
  }
  node.value = value;
  node.addEventListener("change", () => onChange(node.value));
  return node;
}

/** 공급가액 절사 · 총공사비 절사(9택) · 이윤금액 직접입력 — 떨어지는 몫은 이윤에서. */
function drawCuts(data: ProgressDto, current: Round): HTMLElement[] {
  const supply = el("label");
  supply.append(
    el("span", "", "공급가액 절사"),
    choiceSelect(
      data.fields.supply_cut,
      current.supply_cut_krw,
      (v) => (current.supply_cut_krw = v),
    ),
  );
  const total = el("label");
  const profit = el("input");
  profit.type = "number";
  profit.min = "0";
  profit.placeholder = "이윤금액(비우면 계약잡비율 값)";
  profit.value = current.profit_manual_krw;
  profit.hidden = current.total_cut_krw !== "";
  profit.addEventListener("input", () => (current.profit_manual_krw = profit.value));
  total.append(
    el("span", "", "총공사비 절사"),
    choiceSelect(data.fields.total_cut, current.total_cut_krw, (v) => {
      current.total_cut_krw = v;
      profit.hidden = v !== "";
    }),
    profit,
  );
  return [supply, total];
}

function drawPanel(ctx: B09TabContext, data: ProgressDto, reload: (round: number) => void): void {
  const projectId = ctx.projectId as string;
  const draft = draftOf(projectId, data);
  const box = el("div", "b09pg__panel");
  const save = async (round: number): Promise<void> => {
    try {
      await saveProgress(projectId, draft.rounds, draft.overrides);
      drafts.delete(projectId);
      showToast("기성 회차 저장 — 계약 내역은 그대로", "success");
      reload(round);
    } catch (error) {
      showToast(error instanceof Error ? error.message : "저장 못 함", "error");
    }
  };
  const pick = el("label");
  pick.append(el("span", "", "회차"));
  const select = el("select");
  for (let n = 1; n <= draft.rounds.length; n += 1) {
    const option = el("option", "", `${n}회`);
    option.value = String(n);
    select.append(option);
  }
  select.value = String(data.round);
  select.addEventListener("change", () => reload(Number(select.value)));
  pick.append(select);
  box.append(pick);
  box.append(
    createButton({
      label: "회차 추가(저장)",
      variant: "ghost",
      onClick: () => {
        const last = draft.rounds[draft.rounds.length - 1];
        draft.rounds.push({
          quantities: {},
          vat_mode: last?.vat_mode ?? "supply",
          vat_manual_krw: "",
          supply_cut_krw: last?.supply_cut_krw ?? "",
          total_cut_krw: last?.total_cut_krw ?? "",
          profit_manual_krw: "",
          assessed: {},
        });
        void save(draft.rounds.length);
      },
    }),
  );
  if (draft.rounds.length) {
    box.append(
      createButton({
        label: `${draft.rounds.length}회 지우기(저장)`,
        variant: "ghost",
        onClick: () => {
          // 앞 회차를 지우면 뒤 회차의 전회가 통째로 바뀜 — 마지막 회차만 지움.
          draft.rounds.pop();
          void save(draft.rounds.length);
        },
      }),
    );
  }
  const current = draft.rounds[data.round - 1];
  if (current) {
    const vat = el("label");
    vat.append(el("span", "", "부가세"));
    const mode = el("select");
    for (const choice of data.fields.vat) {
      const option = el("option", "", choice.label);
      option.value = choice.key;
      mode.append(option);
    }
    mode.value = current.vat_mode;
    const manual = el("input");
    manual.type = "number";
    manual.min = "0";
    manual.placeholder = "직접입력 금액";
    manual.value = current.vat_manual_krw;
    manual.hidden = current.vat_mode !== "manual";
    mode.addEventListener("change", () => {
      current.vat_mode = mode.value;
      manual.hidden = mode.value !== "manual";
    });
    manual.addEventListener("input", () => (current.vat_manual_krw = manual.value));
    vat.append(mode, manual);
    box.append(vat, ...drawCuts(data, current));
    box.append(createButton({ label: "저장", onClick: () => save(data.round) }));
  } else {
    box.append(el("div", "b09pg__meta", "회차 없음 — [회차 추가]로 1회부터"));
  }
  ctx.panel.append(box);
}

/** 기성 제잡비 계산서 — 제잡비 줄 + 합계 줄(직접공사비 · 제잡비 계 · 공급가액 · 부가세 · 기성금액). */
function drawJab(data: ProgressDto, overrides: Overrides): HTMLElement {
  const box = el("div");
  box.append(
    el(
      "strong",
      "",
      `기성 제잡비 계산서 — 금회직접공사비 × 계약잡비율 · 계약 제잡비율 ${pct(data.contract_overhead_ratio_pct)}`,
    ),
    el(
      "div",
      "b09pg__meta",
      "계약잡비율 기본 = 역산(도급액 ÷ 계약 직접공사비) · 계약서 값이 다르면 직접입력 + 사유 → [저장] · ↺ 로 역산값",
    ),
  );
  const table = el("table", "b09pg__table");
  const head = el("tr");
  for (const label of [
    "명칭",
    "도급액",
    "계약잡비율",
    "직접입력(%)",
    "사유",
    "",
    ...COLUMNS.flatMap(([, a, r]) => [a, r]),
  ]) {
    head.append(el("th", "", label));
  }
  table.append(head);
  const line = (row: AmountRow, total: boolean): void => {
    const tr = el("tr", total ? "is-total" : "");
    const ratio = el("td", "num", pct(row.contract_ratio_pct));
    if (row.override) ratio.title = `역산값 ${row.default_ratio_pct}% — 직접입력이 이김`;
    tr.append(el("td", "", row.name), el("td", "num", won(row.contract_krw)), ratio);
    const cells = [el("td"), el("td"), el("td")];
    if (!total) {
      const entry = (): Override => (overrides[row.key] ??= { rate_pct: "", reason: "" });
      const rate = el("input");
      rate.type = "number";
      rate.min = "0";
      rate.step = "any";
      rate.placeholder = row.default_ratio_pct ?? "";
      rate.value = overrides[row.key]?.rate_pct ?? "";
      rate.addEventListener("input", () => (entry().rate_pct = rate.value));
      const reason = el("input");
      reason.placeholder = "사유(계약서 등)";
      reason.style.width = "12em";
      reason.style.textAlign = "left";
      reason.value = overrides[row.key]?.reason ?? "";
      reason.addEventListener("input", () => (entry().reason = reason.value));
      const revert = el("button", "", "↺");
      revert.type = "button";
      revert.title = "역산값으로 되돌림 — [저장]하면 반영";
      revert.disabled = !overrides[row.key];
      revert.addEventListener("click", () => {
        delete overrides[row.key];
        rate.value = "";
        reason.value = "";
      });
      cells[0].append(rate);
      cells[1].append(reason);
      cells[2].append(revert);
    }
    tr.append(...cells);
    for (const [col] of COLUMNS) {
      const text = (key: string): string | null => {
        const value = row[key];
        return typeof value === "string" ? value : null;
      };
      tr.append(el("td", "num", won(text(`${col}_krw`))), el("td", "num", pct(text(`${col}_pct`))));
    }
    table.append(tr);
  };
  for (const row of data.items) line(row, false);
  for (const row of data.summary) line(row, true);
  box.append(table);
  return box;
}

function drawBill(data: ProgressDto, rounds: Round[]): HTMLElement {
  const box = el("div");
  box.append(el("strong", "", `기성내역 — ${data.round ? `${data.round}회` : "회차 없음"}`));
  const table = el("table", "b09pg__table");
  const head = el("tr");
  for (const label of [
    "공종번호",
    "명칭",
    "규격",
    "단위",
    "계약수량",
    "계약금액",
    "전회수량",
    "전회금액",
    "금회수량",
    "금회금액",
    "사정(칸만)",
    "누계수량",
    "누계금액",
    "기성(%)",
    "잔량",
    "비고",
  ]) {
    head.append(el("th", "", label));
  }
  table.append(head);
  const current = rounds[data.round - 1];
  for (const row of data.rows) {
    const tr = el("tr", row.is_group ? "is-group" : "");
    const leaf = !row.is_group && row.in_bill && row.progress_current_quantity !== undefined;
    tr.append(
      el("td", "", row.item_no),
      el("td", "", row.name),
      el("td", "", row.spec ?? ""),
      el("td", "", row.unit ?? ""),
      el("td", "num", leaf ? (row.quantity ?? "") : ""),
      el("td", "num", won(row.contract_amount_krw)),
      el("td", "num", leaf ? String(row.progress_previous_quantity) : ""),
      el("td", "num", won(row.progress_previous_amount_krw)),
    );
    const cell = el("td");
    if (leaf && current) {
      const qty = el("input");
      qty.type = "number";
      qty.min = "0";
      qty.step = "any";
      qty.value = current.quantities[row.item_no] ?? "";
      qty.addEventListener("input", () => {
        if (qty.value === "") delete current.quantities[row.item_no];
        else current.quantities[row.item_no] = qty.value;
      });
      cell.append(qty);
    }
    // 사정 — 뜻 미확인(「기성내역서(사정)」 열 이름뿐) · 계산에 안 씀.
    const assessed = el("td");
    if (leaf && current) {
      const amount = el("input");
      amount.type = "number";
      amount.min = "0";
      amount.title = "사정 — 뜻 확인 대기 · 금액에 안 섞임";
      amount.value = current.assessed[row.item_no] ?? "";
      amount.addEventListener("input", () => {
        if (amount.value === "") delete current.assessed[row.item_no];
        else current.assessed[row.item_no] = amount.value;
      });
      assessed.append(amount);
    }
    tr.append(
      cell,
      el("td", "num", won(row.progress_current_amount_krw)),
      assessed,
      el("td", "num", leaf ? String(row.progress_cumulative_quantity) : ""),
      el("td", "num", won(row.progress_cumulative_amount_krw)),
      el("td", "num", pct(row.progress_pct)),
      el("td", "num", row.progress_remaining_quantity ?? ""),
      el("td", "", row.progress_note ?? ""),
    );
    table.append(tr);
  }
  box.append(table);
  return box;
}

function drawBody(ctx: B09TabContext, data: ProgressDto): void {
  const draft = draftOf(ctx.projectId as string, data);
  const wrap = el("div", "b09pg");
  wrap.append(el("div", "b09pg__warn", `⚠ ${data.limit_note}`));
  for (const note of data.notes) wrap.append(el("div", "b09pg__warn", `⚠ ${note}`));
  wrap.append(el("div", "b09pg__meta", "금회 기성수량을 넣고 [저장]하면 반영"));
  const scroll = el("div", "b09pg__scroll");
  scroll.append(drawJab(data, draft.overrides), drawBill(data, draft.rounds));
  wrap.append(scroll);
  ctx.body.append(wrap);
}

function render(ctx: B09TabContext): void {
  injectStyles();
  if (!ctx.projectId) {
    ctx.body.append(el("div", "b09pg__meta", "프로젝트를 고르세요"));
    return;
  }
  const load = (round: number | null): void => {
    ctx.body.replaceChildren(
      el("div", "b09pg__meta", `${L("B09_Estimation_Tab_Progress")} 계산 중…`),
    );
    ctx.panel.replaceChildren();
    fetchProgress(ctx.projectId as string, round)
      .then((data) => {
        const draft = drafts.get(ctx.projectId as string);
        if (draft) draft.round = data.round;
        ctx.body.replaceChildren();
        drawPanel(ctx, data, load);
        drawBody(ctx, data);
      })
      .catch((error: unknown) => {
        ctx.body.replaceChildren(
          el(
            "div",
            "b09pg__warn",
            `기성을 세우지 못함 — ${error instanceof Error ? error.message : ""}`,
          ),
        );
      });
  };
  load(drafts.get(ctx.projectId)?.round ?? null);
}

export const progressTab: B09Tab = {
  key: "progress",
  label: () => L("B09_Estimation_Tab_Progress"),
  render,
};