/* =============================================================================
 * B09_Estimation_UI_Tabs_Base_Quote.ts
 * 자재단가대비표 「견적서」 칸 작은 모달(PLAN 166-4) — 자재 줄 하나의 견적서 여러 파일 ·
 * 목록 · 올리기(여러 개) · 내려받기 · 지우기. 파일은 올리는 즉시 서버에 둠([저장]과 따로).
 *
 *   길 = `B09_Estimation_Router_Quotes.py` · 바뀐 목록은 onChange(이름들)로 표 칸 「n 파일」에 반영
 * ========================================================================== */

import { API_BASE_URL, CURRENT_PROJECT_ID_KEY } from "@config/config_frontend";
import { openModal } from "@ui/ui_template_modal";
import { createButton, el, showToast } from "@ui/ui_template_elements";

interface QuoteFile {
  name: string;
  size: number;
  at: string;
}

const url = (key: string, name?: string): string => {
  const projectId = localStorage.getItem(CURRENT_PROJECT_ID_KEY) ?? "";
  const q = new URLSearchParams({ key, ...(name ? { name } : {}) });
  return `${API_BASE_URL}/projects/${projectId}/estimation/quotes${name ? "/file" : ""}?${q}`;
};

async function call(input: string, init: RequestInit = {}): Promise<Response> {
  const response = await fetch(input, { credentials: "include", ...init });
  if (!response.ok) {
    const body = (await response.json().catch(() => null)) as { detail?: unknown } | null;
    throw new Error(typeof body?.detail === "string" ? body.detail : `HTTP ${response.status}`);
  }
  return response;
}

async function download(key: string, name: string): Promise<void> {
  const blob = await (await call(url(key, name))).blob();
  const a = el("a", { attrs: { href: URL.createObjectURL(blob), download: name } });
  a.click();
  URL.revokeObjectURL(a.href);
}

/** 견적서 모달 — label = 「품명 규격」 */
export function openQuotes(key: string, label: string, onChange: (names: string[]) => void): void {
  openModal({
    title: `견적서 — ${label}`,
    closeLabel: "닫기",
    mount: (body) => {
      const list = el("ul", { className: "b09-quotes" });
      const show = (files: QuoteFile[]): void => {
        onChange(files.map((f) => f.name));
        list.replaceChildren(
          ...(files.length
            ? files.map((f) =>
                el("li", {
                  children: [
                    createButton({
                      label: `${f.name} (${Math.ceil(f.size / 1024).toLocaleString()} KB)`,
                      variant: "ghost",
                      size: "sm",
                      onClick: () => void download(key, f.name).catch(fail),
                    }),
                    createButton({
                      label: "지우기",
                      variant: "danger",
                      size: "sm",
                      onClick: () =>
                        void call(url(key, f.name).replace("/file?", "?"), { method: "DELETE" })
                          .then((r) => r.json())
                          .then(show, fail),
                    }),
                  ],
                }),
              )
            : [el("li", { text: "올린 견적서 없음" })]),
        );
      };
      const fail = (error: unknown): void =>
        showToast(`하지 못했습니다 — ${String(error)}`, "error");
      const input = el("input", { attrs: { type: "file", multiple: "" } });
      input.addEventListener("change", () => {
        const form = new FormData();
        for (const file of Array.from(input.files ?? [])) form.append("files", file);
        input.value = "";
        void call(url(key), { method: "POST", body: form })
          .then((r) => r.json())
          .then(show, fail);
      });
      const pick = createButton({
        label: "견적서 올리기(여러 개)",
        variant: "filled",
        size: "sm",
        onClick: () => input.click(),
      });
      input.hidden = true;
      body.append(pick, input, list);
      void call(url(key))
        .then((r) => r.json())
        .then(show, fail);
    },
  });
}