'use client';

import { useActionState, useEffect, useRef, useState } from 'react';
import { FoxButton } from '@fox/core/components/fox-button';
import { FoxHelperText } from '@fox/core/components/fox-helper-text';
import { FoxInput } from '@fox/core/components/fox-input';
import { FoxModal } from '@fox/core/components/fox-modal';
import { FoxSelect } from '@fox/core/components/fox-select';
import { FoxTextArea } from '@fox/core/components/fox-text-area';
import { submitFormAction } from '@/app/_hooks/submit-form-action';
import { useFeedback } from '@/app/_hooks/use-feedback';
import {
  formatInquiryTypeLabel,
  formatOptionalValue,
  type BoardPost,
} from '@/lib/domain/board-post';
import {
  ANSWER_MAX_LENGTH,
  INITIAL_INQUIRY_ANSWER_FORM_STATE,
} from '@/lib/domain/board-post-form';
import type { CommonCode } from '@/lib/domain/common-code';
import { saveInquiryAnswerAction } from '../../_actions';
import { BoardAttachmentField } from '../../_components/board-attachment-field';
import styles from './inquiry-answer-modal.module.scss';

interface InquiryAnswerModalProps {
  post: BoardPost;
  /** 공통코드 `BBS_ANS_CD` — 진행상태 선택지. */
  answerStatuses: readonly CommonCode[];
  onClose: () => void;
}

// 백엔드가 「답변완료」로 처음 저장될 때만 학습자에게 푸시를 보낸다
// (MngrBbsServiceImpl.update — 이전 답변자가 없을 때 1회). 관리자가 그 사실을 알아야
// 상태를 고르는 판단이 선다.
const STATUS_HELP_TEXT =
  '답변완료 선택 시에만 FO(사용자 화면)에 답변 내용 노출, 목록에 답변일도 표시. 처음 답변완료로 저장할 때 학습자에게 알림이 발송됩니다.';

/**
 * 이슈: 기획의 "답변완료 시 앱푸쉬 전송"은 백엔드 푸시 분기가 빈 블록이라 동작하지 않는다.
 * 이슈: 백엔드 첨부 필드가 `atchFileId` 하나뿐이라 질문 첨부와 답변 첨부가 같은 자리를 쓴다.
 */
export function InquiryAnswerModal({
  post,
  answerStatuses,
  onClose,
}: InquiryAnswerModalProps) {
  const { showToast } = useFeedback();
  const formRef = useRef<HTMLFormElement>(null);
  const [statusCode, setStatusCode] = useState(
    post.answerStatusCode ?? answerStatuses[0]?.code ?? ''
  );
  const [state, formAction, isPending] = useActionState(
    saveInquiryAnswerAction,
    INITIAL_INQUIRY_ANSWER_FORM_STATE
  );

  useEffect(() => {
    if (state.status === 'success') {
      showToast({ variant: 'success', message: '답변을 저장했습니다.' });
      onClose();
    }
  }, [state, showToast, onClose]);

  const errors = state.status === 'error' ? (state.errors ?? {}) : {};

  return (
    <FoxModal
      dismissible={false}
      open
      size="md"
      title="1:1문의 상세 및 답변"
      onClose={onClose}
      actions={
        <>
          <FoxButton type="default" size="md" label="취소" onAction={onClose} />
          <FoxButton
            type="primary"
            size="md"
            label="저장"
            loading={isPending}
            onAction={() => formRef.current?.requestSubmit()}
          />
        </>
      }
    >
      <form
        ref={formRef}
        onSubmit={(event) => submitFormAction(event, formAction)}
        className={styles.fields}
      >
        <input type="hidden" name="id" value={post.id} />

        <div className={styles.field}>
          <FoxInput
            size="md"
            label="질문유형"
            value={post.typeName ?? formatInquiryTypeLabel(post.typeCode)}
            readOnly
          />
        </div>

        <p className={styles.sectionTitle}>게시물의 항목 (조회 전용)</p>

        <div className={styles.field}>
          <div className={styles.pair}>
            <FoxInput
              size="md"
              label="질문자명"
              value={formatOptionalValue(post.authorName)}
              readOnly
            />
            <FoxInput
              size="md"
              label="작성일"
              value={formatOptionalValue(post.createdAt)}
              readOnly
            />
          </div>
        </div>

        <div className={styles.field}>
          <div className={styles.pair}>
            <FoxInput
              size="md"
              label="이메일"
              value={formatOptionalValue(post.authorEmail)}
              readOnly
            />
            <FoxInput
              size="md"
              label="전화번호"
              value={formatOptionalValue(post.authorPhoneNumber)}
              readOnly
            />
          </div>
        </div>

        <div className={styles.field}>
          <FoxTextArea
            label="질문내용"
            value={post.content}
            readOnly
            rows={4}
          />
        </div>

        <div className={styles.field}>
          <FoxSelect
            size="md"
            label="진행상태"
            requirement="required"
            options={answerStatuses.map((status) => ({
              value: status.code,
              label: status.label,
            }))}
            value={statusCode}
            onValueChange={setStatusCode}
            error={Boolean(errors.answerStatusCode)}
            hint={errors.answerStatusCode ?? STATUS_HELP_TEXT}
          />
          <input type="hidden" name="answerStatusCode" value={statusCode} />
        </div>

        <div className={styles.field}>
          <FoxTextArea
            name="answerContent"
            label="답변내용"
            defaultValue={post.answerContent ?? ''}
            maxLength={ANSWER_MAX_LENGTH}
            counter
            rows={4}
            placeholder="답변 내용을 입력하세요."
            invalid={Boolean(errors.answerContent)}
            message={errors.answerContent}
          />
        </div>

        <div className={styles.field}>
          <BoardAttachmentField
            label="답변 첨부파일"
            attachmentId={post.attachmentId}
          />
        </div>

        {state.status === 'error' && state.message && (
          <FoxHelperText type="danger" message={state.message} />
        )}
      </form>
    </FoxModal>
  );
}