/* =============================================================================
 * M01_MasterData_UI_Logic_Api.ts
 * 로직 화면이 부르는 서버 길 — 계약 `resources/master_data/_화면_계약.md` · `/api/m01`
 * ========================================================================== */

import { API_BASE_URL } from "@config/config_frontend";

/** 로직 한 줄 — 파일 그대로(한글 칸) · 틀 `_틀.md` 6장 */
export interface LogicInput {
  이름: string;
  단위?: string;
  고르기?: string[];
  범위?: [number, number];
}
export interface HoLine {
  종류: string;
  요소: string;
  이름?: string;
  규격?: string;
  단위?: string;
  수량: string;
  비목?: string;
}
export interface NamedFormula {
  이름: string;
  식: string;
  비목?: string;
  출처?: string;
}
export interface LogicRow {
  열쇠: string;
  이름: string;
  결과단위: string;
  출처: string;
  소유?: string;
  입력: LogicInput[];
  중간: NamedFormula[];
  호표?: HoLine[];
  결과?: { 식: string };
  덧줄?: NamedFormula[];
  끝수?: string | null;
  비고?: string;
  [extra: string]: unknown;
}

export interface LogicSummary {
  file: string;
  book: string;
  chapter: string;
  열쇠: string;
  이름: string;
  결과단위: string;
  출처: string;
  blocked: boolean;
  reasons: string[];
}

export interface ElementBrief {
  ref: string;
  file?: string;
  이름?: string;
  규격?: string;
  단위?: unknown;
  값?: unknown;
  값칸?: Record<string, string> | null;
}

export interface LogicOne {
  file: string;
  version: string;
  logic: LogicRow;
  blocked: boolean;
  reasons: string[];
  prices: Record<string, ElementBrief | null>;
}

export interface CalcLine {
  이름: string;
  단위: string;
  수량: number;
  단가: number;
  금액: number;
  비목: Record<string, number>;
}
export type CalcAnswer =
  | {
      ok: true;
      lines?: CalcLine[];
      sums?: Record<string, number>;
      result?: unknown;
      middle: Record<string, unknown>;
    }
  | { ok: false; reason: string };

export interface LogicFile {
  file: string;
  book: string;
  chapter: string;
  version: string;
}

export interface SaveChange {
  op: "edit" | "add" | "delete";
  key?: string;
  row?: LogicRow;
}
export interface SaveFile {
  file: string;
  version: string;
  changes: SaveChange[];
}

/** 서버가 준 몸과 상태 번호 — 409·422 는 몸(`detail`)을 화면이 풀어 보임 */
export class ApiError extends Error {
  constructor(
    public status: number,
    public detail: unknown,
  ) {
    super(typeof detail === "string" ? detail : JSON.stringify(detail));
  }
}

async function request<T>(path: string, body?: unknown): Promise<T> {
  const response = await fetch(`${API_BASE_URL}/m01${path}`, {
    method: body === undefined ? "GET" : "POST",
    credentials: "include",
    headers: { "Content-Type": "application/json" },
    body: body === undefined ? undefined : JSON.stringify(body),
  });
  const data = (await response.json().catch(() => ({}))) as { detail?: unknown } & T;
  if (!response.ok) throw new ApiError(response.status, data.detail ?? response.statusText);
  return data;
}

const query = (params: Record<string, string>): string => new URLSearchParams(params).toString();

export const fetchLogics = (): Promise<LogicSummary[]> =>
  request<{ logics: LogicSummary[] }>("/logics").then((d) => d.logics);

export const fetchLogic = (book: string, key: string): Promise<LogicOne> =>
  request(`/logic?${query({ book, key })}`);

export const fetchLogicFiles = (): Promise<LogicFile[]> =>
  request<{ files: LogicFile[] }>(`/groups/${encodeURIComponent("로직")}/files`).then(
    (d) => d.files,
  );

export const searchElements = (
  group: string,
  q: string,
): Promise<{ total: number; items: ElementBrief[] }> =>
  request(`/elements?${query({ group, q, limit: "100" })}`);

export const runCalc = (body: {
  book: string;
  key: string;
  inputs: Record<string, unknown>;
  row?: LogicRow;
  file?: string;
}): Promise<CalcAnswer> => request("/calc", body);

export const saveFiles = (
  files: SaveFile[],
): Promise<{ files: { file: string; version: string }[] }> => request("/save", { files });