/* =============================================================================
 * ui_template_item_picker_ask.ts
 * 고르기 모달에서 글을 물을 때 쓰는 작은 입력 창(계획서 26-3b) — [개인에 저장](경로 · 이름) ·
 * 나무 오른쪽 클릭 「새 항목」(이름 · 단위). 확인 = 넣은 글들 · 취소 · 닫기 = null.
 * ========================================================================== */

import { createButton, createInputField, el } from "./ui_template_elements";
import { openModal } from "./ui_template_modal";

export interface AskField {
  key: string;
  label: string;
  value?: string;
  placeholder?: string;
  /** 비우면 확인 안 됨 */
  required?: boolean;
}

export interface AskOptions {
  title: string;
  /** 창 위 한 줄 설명 */
  note?: string;
  fields: AskField[];
  okLabel: string;
  cancelLabel: string;
  closeLabel: string;
  /** 빈 값 알림 — `{label}` 자리에 칸 이름 */
  emptyText: string;
}

export function askFields(opts: AskOptions): Promise<Record<string, string> | null> {
  return new Promise((resolve) => {
    let done = false;
    const finish = (value: Record<string, string> | null): void => {
      if (done) return;
      done = true;
      resolve(value);
    };
    openModal({
      title: opts.title,
      closeLabel: opts.closeLabel,
      dialogClass: "ui-item-ask",
      backdropClass: "ui-item-ask__backdrop",
      beforeClose: () => {
        finish(null);
        return true;
      },
      mount: (body, close) => {
        const inputs = opts.fields.map((field) => ({
          field,
          input: createInputField({
            label: field.label,
            value: field.value ?? "",
            placeholder: field.placeholder,
          }),
        }));
        const submit = (): void => {
          let bad = false;
          for (const { field, input } of inputs) {
            const empty = field.required && input.input.value.trim() === "";
            input.setError(empty ? opts.emptyText.replace("{label}", field.label) : undefined);
            bad ||= !!empty;
          }
          if (bad) return;
          finish(
            Object.fromEntries(
              inputs.map(({ field, input }) => [field.key, input.input.value.trim()]),
            ),
          );
          close();
        };
        for (const { input } of inputs)
          input.input.addEventListener("keydown", (event) => {
            if (event.key === "Enter") submit();
          });
        body.append(
          ...(opts.note ? [el("p", { className: "ui-item-picker__where", text: opts.note })] : []),
          ...inputs.map(({ input }) => input.root),
          el("div", {
            className: "ui-item-picker__actions",
            children: [
              createButton({
                label: opts.cancelLabel,
                variant: "ghost",
                onClick: () => {
                  finish(null);
                  close();
                },
              }),
              createButton({ label: opts.okLabel, variant: "filled", onClick: submit }),
            ],
          }),
        );
      },
    });
  });
}