import { useEffect, useMemo, useState } from 'react';
import { FilePenLine, Plus, Search, Trash2, Upload } from 'lucide-react';
import { Button, Input, Modal, Select, Tag } from '@/components/ui';
import { clientApi, type ClientSmsApplication, type ClientSmsSignature } from '@/api/adminApi';

const statusTone: Record<string, 'success' | 'info' | 'danger' | 'warning'> = {
  approved: 'success',
  pending: 'info',
  rejected: 'danger',
  draft: 'warning',
};

const statusLabel: Record<string, string> = {
  approved: '已通过',
  pending: '审核中',
  rejected: '已驳回',
  draft: '草稿',
  disabled: '已禁用',
};

export function ClientSignaturesPage() {
  const [applications, setApplications] = useState<ClientSmsApplication[]>([]);
  const [signatures, setSignatures] = useState<ClientSmsSignature[]>([]);
  const [keyword, setKeyword] = useState('');
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(true);
  const [modalOpen, setModalOpen] = useState(false);
  const [applicationId, setApplicationId] = useState('');
  const [name, setName] = useState('');
  const [purpose, setPurpose] = useState('');
  const [file, setFile] = useState<File | null>(null);

  function loadData() {
    setLoading(true);
    Promise.all([clientApi.listApplications(), clientApi.listSignatures()])
      .then(([applicationItems, signatureItems]) => {
        setApplications(applicationItems.filter((item) => item.status === 'active'));
        setSignatures(signatureItems.filter((item) => item.auditStatus !== 'disabled' && item.auditStatus !== 'deleted'));
        setError('');
      })
      .catch((reason: Error) => setError(reason.message || '签名数据加载失败'))
      .finally(() => setLoading(false));
  }

  useEffect(() => {
    loadData();
  }, []);

  const filteredSignatures = useMemo(() => signatures.filter((item) => (
    !keyword || [item.name, item.purpose, item.applicationId].join(' ').includes(keyword)
  )), [keyword, signatures]);

  async function createSignature() {
    try {
      const signature = await clientApi.createSignature({ applicationId: applicationId || undefined, name, purpose });
      if (file) {
        const fileObject = await clientApi.uploadFileObject(file, {
          purpose: 'signature_material',
          prefix: `signature-materials/${signature.id}`,
        });
        await clientApi.createSignatureMaterial(signature.id, {
          fileObjectId: fileObject.id,
          materialType: file.type.startsWith('image/') ? 'image' : 'file',
          title: file.name,
        });
      }
      await clientApi.submitSignature(signature.id);
      setModalOpen(false);
      setApplicationId('');
      setName('');
      setPurpose('');
      setFile(null);
      loadData();
    } catch (reason) {
      setError(reason instanceof Error ? reason.message : '签名提交失败');
    }
  }

  function disableSignature(id: string) {
    clientApi.changeSignatureStatus(id, 'disabled')
      .then(loadData)
      .catch((reason: Error) => setError(reason.message || '签名禁用失败'));
  }

  return (
    <section className="page-stack">
      <div className="signature-page-header">
        <div className="sms-send-title">
          <span className="sms-send-title__icon">
            <FilePenLine size={22} />
          </span>
          <h1>签名与报备材料</h1>
        </div>
        <Button icon={<Plus size={17} />} onClick={() => setModalOpen(true)}>添加签名</Button>
      </div>

      <div className="signature-search-row">
        <Input
          onChange={(event) => setKeyword(event.target.value)}
          placeholder="搜索签名名称、用途或应用"
          prefix={<Search size={17} />}
          value={keyword}
        />
      </div>
      {loading ? <p className="muted">正在加载签名...</p> : null}
      {error ? <p className="form-error">{error}</p> : null}

      <div className="signature-list">
        {filteredSignatures.map((signature) => (
          <article className="signature-card signature-card--green" key={signature.id}>
            <div className="signature-summary">
              <div>
                <span>签名名称</span>
                <strong>{signature.name}</strong>
              </div>
              <div>
                <span>用途</span>
                <strong>{signature.purpose ?? '-'}</strong>
              </div>
              <div>
                <span>审核状态</span>
                <Tag tone={statusTone[signature.auditStatus] ?? 'info'}>{statusLabel[signature.auditStatus] ?? signature.auditStatus}</Tag>
              </div>
              <div>
                <span>材料</span>
                <strong>{signature.materials?.length ?? 0} 份</strong>
              </div>
              <div className="signature-actions">
                <Button icon={<Trash2 size={16} />} onClick={() => disableSignature(signature.id)} size="sm" variant="danger">删除</Button>
              </div>
            </div>
          </article>
        ))}
      </div>
      {!loading && !error && filteredSignatures.length === 0 ? <p className="muted">暂无签名记录。</p> : null}

      <Modal
        footer={(
          <>
            <Button onClick={() => setModalOpen(false)} variant="ghost">取消</Button>
            <Button disabled={!name} onClick={createSignature}>提交审核</Button>
          </>
        )}
        onClose={() => setModalOpen(false)}
        open={modalOpen}
        size="xl"
        title="添加签名"
      >
        <div className="signature-form">
          <Select
            label="短信应用"
            onChange={(event) => setApplicationId(event.target.value)}
            options={[{ label: '不绑定应用', value: '' }, ...applications.map((item) => ({ label: item.name, value: item.id }))]}
            value={applicationId}
          />
          <Input label="短信签名" onChange={(event) => setName(event.target.value)} placeholder="请输入短信签名，如【某某科技】" value={name} />
          <Input label="用途" onChange={(event) => setPurpose(event.target.value)} placeholder="请输入签名用途" value={purpose} />
          <label className="signature-upload">
            <Upload size={36} />
            <strong>{file ? file.name : '上传资质图片或文件'}</strong>
            <small>支持图片、PDF、Word 等真实材料文件</small>
            <input
              onChange={(event) => setFile(event.target.files?.[0] ?? null)}
              style={{ display: 'none' }}
              type="file"
            />
          </label>
        </div>
      </Modal>
    </section>
  );
}