import React, { useEffect, useState } from 'react';
import {
  App,
  Button,
  Card,
  Col,
  Divider,
  Drawer,
  Empty,
  Form,
  Input,
  Modal,
  Popconfirm,
  Row,
  Select,
  Skeleton,
  Space,
  Switch,
  Tag,
  Tooltip,
  Typography,
} from 'antd';
import { CopyOutlined, DeleteOutlined, EditOutlined, PlusOutlined, SaveOutlined, StarFilled } from '@ant-design/icons';
import ReactMarkdown from 'react-markdown';
import { useTranslation } from 'react-i18next';
import { useDict } from '../../hooks/useDict';
import {
  deletePromptTemplate,
  getPromptDetail,
  getPromptPage,
  savePromptTemplate,
  updatePromptStatus,
  updatePromptTemplate,
  type PromptTemplateVO,
} from '../../api/business/prompt';
import { getHotWordGroupOptions, type HotWordGroupVO } from '../../api/business/hotwordGroup';
import AppPagination from '../../components/shared/AppPagination';

const { Option } = Select;
const { Text, Title } = Typography;

const PromptTemplates: React.FC = () => {
  const { message } = App.useApp();
  const { t } = useTranslation();
  const [form] = Form.useForm();
  const [searchForm] = Form.useForm();
  const { items: categories, loading: dictLoading } = useDict('biz_prompt_category');
  const { items: dictTags } = useDict('biz_prompt_tag');
  const { items: promptLevels } = useDict('biz_prompt_level');
  const templateLevel = Form.useWatch('isSystem', form);

  const [loading, setLoading] = useState(false);
  const [data, setData] = useState<PromptTemplateVO[]>([]);
  const [total, setTotal] = useState(0);
  const [current, setCurrent] = useState(1);
  const [pageSize, setPageSize] = useState(12);

  const [drawerVisible, setDrawerVisible] = useState(false);
  const [editingId, setEditingId] = useState<number | null>(null);
  const [submitLoading, setSubmitLoading] = useState(false);
  const [previewContent, setPreviewContent] = useState('');
  const [groupOptions, setGroupOptions] = useState<HotWordGroupVO[]>([]);

  const userProfile = React.useMemo(() => {
    const profileStr = sessionStorage.getItem("userProfile");
    return profileStr ? JSON.parse(profileStr) : {};
  }, []);

  const activeTenantId = React.useMemo(() => Number(localStorage.getItem("activeTenantId") || 0), []);
  const isPlatformAdmin = userProfile.isPlatformAdmin === true;
  const isTenantAdmin = userProfile.isTenantAdmin === true;

  useEffect(() => {
    void fetchData();
  }, [current, pageSize]);

  useEffect(() => {
    void loadGroupOptions();
  }, [isPlatformAdmin, templateLevel, activeTenantId]);

  const loadGroupOptions = async () => {
    const targetTenantId = isPlatformAdmin && Number(templateLevel) === 1 ? 0 : undefined;
    const res = await getHotWordGroupOptions(targetTenantId ?? (isPlatformAdmin && activeTenantId === 0 ? 0 : undefined));
    setGroupOptions(res.data?.data || []);
  };

  const fetchData = async () => {
    const values = searchForm.getFieldsValue();
    setLoading(true);
    try {
      const res = await getPromptPage({
        current,
        size: pageSize,
        name: values.name,
        category: values.category,
      });
      if (res.data?.data) {
        setData(res.data.data.records);
        setTotal(res.data.data.total);
      }
    } finally {
      setLoading(false);
    }
  };

  const handleStatusChange = async (id: number, checked: boolean) => {
    await updatePromptStatus(id, checked ? 1 : 0);
    message.success(checked ? '模板已启用' : '模板已停用');
    await fetchData();
  };

  const handleOpenDrawer = (record?: PromptTemplateVO, isClone = false) => {
    if (record) {
      if (isClone) {
        setEditingId(null);
        form.setFieldsValue({
          ...record,
          templateName: `${record.templateName} (副本)`,
          isSystem: 0,
          id: undefined,
          tenantId: undefined,
        });
        setPreviewContent(record.promptContent);
      } else {
        const isPlatformLevel = Number(record.tenantId) === 0 && Number(record.isSystem) === 1;
        const currentUserId = userProfile.userId ? Number(userProfile.userId) : -1;

        let canEdit = false;
        if (Number(record.isSystem) === 0) {
          canEdit = Number(record.creatorId) === currentUserId;
        } else if (isPlatformAdmin) {
          canEdit = isPlatformLevel;
        } else if (isTenantAdmin) {
          canEdit = Number(record.tenantId) === activeTenantId;
        }

        if (!canEdit) {
          message.warning('您无权修改此层级的模板');
          return;
        }

        setEditingId(record.id);
        form.setFieldsValue(record);
        setPreviewContent(record.promptContent);
      }
    } else {
      setEditingId(null);
      form.resetFields();
      form.setFieldsValue({
        status: 1,
        isSystem: (isTenantAdmin || isPlatformAdmin) ? 1 : 0,
      });
      setPreviewContent('');
    }
    setDrawerVisible(true);
  };

  const showDetail = (record: PromptTemplateVO) => {
    void (async () => {
      const detailRes = await getPromptDetail(record.id);
      const detail = detailRes.data?.data || record;
      Modal.info({
      title: record.templateName,
      width: 800,
      icon: null,
      content: (
        <div style={{ maxHeight: '65vh', overflowY: 'auto', padding: '12px 0' }}>
          {detail.description ? (
            <div style={{ marginBottom: 16, padding: '12px 16px', borderRadius: 8, background: 'var(--app-bg-surface-soft)' }}>
              <Text type="secondary">{detail.description}</Text>
            </div>
          ) : null}
          <div style={{ marginBottom: 16 }}>
            <Space wrap>
              {detail.hotWordGroupName ? <Tag color="blue">热词组：{detail.hotWordGroupName}</Tag> : <Tag>未绑定热词组</Tag>}
              {(detail.tags || []).map((tag) => {
                const dictItem = dictTags.find((item) => item.itemValue === tag);
                return <Tag key={tag}>{dictItem ? dictItem.itemLabel : tag}</Tag>;
              })}
            </Space>
          </div>
          {detail.hotWords && detail.hotWords.length > 0 ? (
            <div style={{ marginBottom: 16 }}>
              <div style={{ marginBottom: 8, fontWeight: 600 }}>绑定热词</div>
              <Space wrap>
                {detail.hotWords.map((word) => <Tag key={word}>{word}</Tag>)}
              </Space>
            </div>
          ) : detail.hotWordGroupId ? (
            <div style={{ marginBottom: 16 }}>
              <Text type="secondary">该热词组当前没有热词</Text>
            </div>
          ) : null}
          <ReactMarkdown>{detail.promptContent}</ReactMarkdown>
        </div>
      ),
      okText: '关闭',
      maskClosable: true,
      });
    })();
  };

  const handleSubmit = async () => {
    try {
      const values = await form.validateFields();
      setSubmitLoading(true);
      if (!editingId && isPlatformAdmin && values.isSystem === 1) {
        values.tenantId = 0;
      }
      if (editingId) {
        await updatePromptTemplate({ ...values, id: editingId });
        message.success('更新成功');
      } else {
        await savePromptTemplate(values);
        message.success('模板已创建');
      }
      setDrawerVisible(false);
      await fetchData();
    } finally {
      setSubmitLoading(false);
    }
  };

  const groupedData = React.useMemo(() => {
    const groups: Record<string, PromptTemplateVO[]> = {};
    data.forEach((item) => {
      const cat = item.category || 'default';
      if (!groups[cat]) groups[cat] = [];
      groups[cat].push(item);
    });
    return groups;
  }, [data]);

  const renderCard = (item: PromptTemplateVO) => {
    const isSystem = item.isSystem === 1;
    const isPlatformLevel = Number(item.tenantId) === 0 && isSystem;
    const isTenantLevel = Number(item.tenantId) > 0 && isSystem;
    const isPersonalLevel = !isSystem;
    const currentUserId = userProfile.userId ? Number(userProfile.userId) : -1;

    let canEdit = false;
    if (isPersonalLevel) {
      canEdit = Number(item.creatorId) === currentUserId;
    } else if (isPlatformAdmin) {
      canEdit = Number(item.tenantId) === 0;
    } else if (isTenantAdmin) {
      canEdit = Number(item.tenantId) === activeTenantId;
    }

    const levelTag = isPlatformLevel ? (
      <Tag color="gold" style={{ borderRadius: 4 }}>平台级</Tag>
    ) : isTenantLevel ? (
      <Tag color="blue" style={{ borderRadius: 4 }}>租户级</Tag>
    ) : (
      <Tag color="cyan" style={{ borderRadius: 4 }}>个人级</Tag>
    );

    return (
      <Card
        key={item.id}
        hoverable
        onClick={() => showDetail(item)}
        style={{ width: 320, borderRadius: 12, border: '1px solid var(--app-border-color)', background: 'var(--app-bg-card)', boxShadow: 'var(--app-shadow)', backdropFilter: 'blur(16px)', position: 'relative', overflow: 'hidden' }}
        styles={{ body: { padding: '24px' } }}
      >
        <div style={{ display: 'flex', justifyContent: 'space-between', marginBottom: 16 }}>
          <div style={{ display: 'flex', alignItems: 'center', gap: 8, minWidth: 0, flex: 1 }}>
            <div style={{
              width: 40,
              height: 40,
              borderRadius: 10,
              background: isPlatformLevel ? 'color-mix(in srgb, #f5c542 14%, var(--app-bg-surface-strong))' : (isTenantLevel ? 'color-mix(in srgb, var(--app-primary-color) 12%, var(--app-bg-surface-strong))' : 'color-mix(in srgb, #13c2c2 12%, var(--app-bg-surface-strong))'),
              display: 'flex',
              justifyContent: 'center',
              alignItems: 'center',
              flexShrink: 0,
            }}>
              <StarFilled style={{ fontSize: 20, color: isPlatformLevel ? '#faad14' : (isTenantLevel ? '#1890ff' : '#13c2c2') }} />
            </div>
            <div style={{ flexShrink: 0 }}>{levelTag}</div>
          </div>
          <Space onClick={(e) => e.stopPropagation()} style={{ flexShrink: 0, marginLeft: 8 }}>
            {canEdit && <EditOutlined style={{ fontSize: 18, color: '#bfbfbf', cursor: 'pointer' }} onClick={() => handleOpenDrawer(item)} />}
            <Switch size="small" checked={item.status === 1} onChange={(checked) => void handleStatusChange(item.id, checked)} />
          </Space>
        </div>

        <div style={{ marginBottom: 12 }}>
          <Text strong style={{ fontSize: 16, display: 'block', width: '100%' }} ellipsis={{ tooltip: item.templateName }}>{item.templateName}</Text>
          {item.description ? (
            <Text type="secondary" style={{ fontSize: 12, display: '-webkit-box', WebkitLineClamp: 2, WebkitBoxOrient: 'vertical', overflow: 'hidden', marginTop: 6 }}>
              {item.description}
            </Text>
          ) : null}
        </div>

        <div style={{ display: 'flex', flexWrap: 'wrap', gap: 6, marginBottom: 12, minHeight: 22 }}>
          {item.hotWordGroupName ? <Tag color="blue" style={{ margin: 0 }}>热词组：{item.hotWordGroupName}</Tag> : null}
          {item.tags?.map((tag) => {
            const dictItem = dictTags.find((dt) => dt.itemValue === tag);
            return (
              <Tag key={tag} style={{ margin: 0, border: '1px solid var(--app-border-color)', background: 'var(--app-bg-surface-soft)', color: 'var(--app-text-main)', borderRadius: 4, fontSize: 10, maxWidth: 100, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>
                {dictItem ? dictItem.itemLabel : tag}
              </Tag>
            );
          })}
          {!item.hotWordGroupName && (!item.tags || item.tags.length === 0) ? <Text type="secondary">未配置标签</Text> : null}
        </div>

        <div style={{ display: 'flex', justifyContent: 'flex-end', alignItems: 'center', paddingTop: 12, borderTop: '1px solid #f5f5f5' }}>
          <Space onClick={(e) => e.stopPropagation()}>
            <Tooltip title="以此创建">
              <CopyOutlined style={{ color: '#bfbfbf', cursor: 'pointer', fontSize: 16 }} onClick={() => handleOpenDrawer(item, true)} />
            </Tooltip>
            {canEdit && (
              <Popconfirm
                title="确定删除？"
                onConfirm={() => deletePromptTemplate(item.id).then(() => fetchData())}
                okText={t('common.confirm')}
                cancelText={t('common.cancel')}
              >
                <Tooltip title="删除">
                  <DeleteOutlined style={{ color: '#bfbfbf', cursor: 'pointer', fontSize: 16 }} />
                </Tooltip>
              </Popconfirm>
            )}
          </Space>
        </div>
      </Card>
    );
  };

  return (
    <div style={{ padding: '32px', background: 'var(--app-bg-page)', height: 'calc(100vh - 64px)', overflow: 'hidden' }}>
      <div style={{ maxWidth: 1400, margin: '0 auto', height: '100%', display: 'flex', flexDirection: 'column', minHeight: 0 }}>
        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 32 }}>
          <Title level={3} style={{ margin: 0 }}>提示词模板</Title>
          <Button type="primary" icon={<PlusOutlined />} size="large" onClick={() => handleOpenDrawer()} style={{ borderRadius: 6 }}>
            新增模板
          </Button>
        </div>

        <Card variant="borderless" style={{ borderRadius: 12, marginBottom: 32, background: 'var(--app-bg-card)', border: '1px solid var(--app-border-color)', boxShadow: 'var(--app-shadow)', backdropFilter: 'blur(16px)' }} styles={{ body: { padding: '20px 24px' } }}>
          <Form form={searchForm} layout="inline" onFinish={() => void fetchData()}>
            <Form.Item name="name" label="模板名称"><Input placeholder="请输入..." style={{ width: 180 }} /></Form.Item>
            <Form.Item name="category" label="分类">
              <Select placeholder="选择分类" style={{ width: 160 }} allowClear>
                {categories.map((c) => <Option key={c.itemValue} value={c.itemValue}>{c.itemLabel}</Option>)}
              </Select>
            </Form.Item>
            <Form.Item>
              <Space>
                <Button type="primary" htmlType="submit">查询数据</Button>
                <Button onClick={() => { searchForm.resetFields(); void fetchData(); }}>重置</Button>
              </Space>
            </Form.Item>
          </Form>
        </Card>

        <Card className="app-page__content-card" style={{ flex: 1, minHeight: 0 }} styles={{ body: { padding: 0, height: '100%', display: 'flex', flexDirection: 'column', overflow: 'hidden' } }}>
          <Skeleton loading={loading} active style={{ height: '100%' }}>
            {Object.keys(groupedData).length === 0 ? (
              <div className="app-page__empty-state" style={{ padding: 24 }}>
                <Empty description="暂无可用模板" />
              </div>
            ) : (
              <>
                <div style={{ flex: 1, minHeight: 0, overflowY: 'auto', padding: '24px 24px 0' }}>
                  {Object.keys(groupedData).map((catKey) => {
                    const catLabel = categories.find((c) => c.itemValue === catKey)?.itemLabel || catKey;
                    return (
                      <div key={catKey} style={{ marginBottom: 40 }}>
                        <Title level={4} style={{ marginBottom: 24, paddingLeft: 8, borderLeft: '4px solid #1890ff' }}>{catLabel}</Title>
                        <div style={{ display: 'flex', flexWrap: 'wrap', gap: 24 }}>
                          {groupedData[catKey].map(renderCard)}
                        </div>
                      </div>
                    );
                  })}
                </div>
                <AppPagination
                  current={current}
                  pageSize={pageSize}
                  total={total}
                  onChange={(page, size) => {
                    setCurrent(page);
                    setPageSize(size);
                  }}
                />
              </>
            )}
          </Skeleton>
        </Card>
      </div>

      <Drawer
        title={<Title level={4} style={{ margin: 0 }}>{editingId ? '编辑模板' : '创建新模板'}</Title>}
        width="80%"
        onClose={() => setDrawerVisible(false)}
        open={drawerVisible}
        forceRender
        extra={
          <Space>
            <Button onClick={() => setDrawerVisible(false)}>取消</Button>
            <Button type="primary" icon={<SaveOutlined />} loading={submitLoading} onClick={() => void handleSubmit()}>保存</Button>
          </Space>
        }
        destroyOnHidden
      >
        <Form form={form} layout="vertical">
          <Row gutter={24}>
            <Col span={(isPlatformAdmin || isTenantAdmin) ? 8 : 12}>
              <Form.Item name="templateName" label="模板名称" rules={[{ required: true }]}>
                <Input />
              </Form.Item>
            </Col>
            {(isPlatformAdmin || isTenantAdmin) && (
              <Col span={6}>
                <Form.Item name="isSystem" label="模板属性" rules={[{ required: true }]}>
                  <Select placeholder="选择属性">
                    {promptLevels.length > 0 ? (
                      promptLevels.map((i) => <Option key={i.itemValue} value={Number(i.itemValue)}>{i.itemLabel}</Option>)
                    ) : (
                      <>
                        <Option value={1}>{isPlatformAdmin ? '系统预置 (全局)' : '租户预置 (全员)'}</Option>
                        <Option value={0}>个人模板</Option>
                      </>
                    )}
                  </Select>
                </Form.Item>
              </Col>
            )}
            <Col span={(isPlatformAdmin || isTenantAdmin) ? 5 : 6}>
              <Form.Item name="category" label="分类" rules={[{ required: true }]}>
                <Select loading={dictLoading}>
                  {categories.map((i) => <Option key={i.itemValue} value={i.itemValue}>{i.itemLabel}</Option>)}
                </Select>
              </Form.Item>
            </Col>
            <Col span={isPlatformAdmin ? 5 : 6}>
              <Form.Item name="status" label="状态">
                <Select>
                  <Option value={1}>启用</Option>
                  <Option value={0}>禁用</Option>
                </Select>
              </Form.Item>
            </Col>
          </Row>

          <Form.Item name="description" label="模板描述">
            <Input.TextArea
              maxLength={255}
              showCount
              autoSize={{ minRows: 2, maxRows: 4 }}
              placeholder="请输入模板描述"
            />
          </Form.Item>

          <Row gutter={24}>
            <Col span={12}>
              <Form.Item name="tags" label="业务标签" tooltip="可从现有标签中选择，也可输入新内容按回车保存">
                <Select mode="tags" placeholder="选择或输入新标签" allowClear tokenSeparators={[',', ' ', ';']}>
                  {dictTags.map((item) => <Option key={item.itemValue} value={item.itemValue}>{item.itemLabel}</Option>)}
                </Select>
              </Form.Item>
            </Col>
            <Col span={12}>
              <Form.Item
                name="hotWordGroupId"
                label="绑定热词组"
                tooltip="可选，未绑定则保持兼容"
              >
                <Select
                  placeholder="选择热词组"
                  allowClear
                  options={groupOptions.map((item) => ({ label: `${item.groupName} (${item.hotWordCount}/200)`, value: item.id }))}
                />
              </Form.Item>
            </Col>
          </Row>

          <Divider orientation="left">提示词编辑器 (Markdown 实时预览)</Divider>
          <Row gutter={24} style={{ height: 'calc(100vh - 400px)' }}>
            <Col span={12} style={{ height: '100%' }}>
              <Form.Item name="promptContent" noStyle rules={[{ required: true }]}>
                <Input.TextArea
                  onChange={(e) => setPreviewContent(e.target.value)}
                  style={{ height: '100%', fontFamily: 'monospace', resize: 'none', border: '1px solid #d9d9d9', borderRadius: 8, padding: 12 }}
                  placeholder="在此输入 Markdown 指令..."
                />
              </Form.Item>
            </Col>
            <Col span={12} style={{ height: '100%', overflowY: 'auto', background: 'var(--app-bg-surface-soft)', border: '1px solid var(--app-border-color)', borderRadius: 8, padding: '16px 24px' }}>
              <div style={{ marginBottom: 12 }}>
                {form.getFieldValue('hotWordGroupId') ? (
                  <Tag color="blue">
                    绑定热词组：
                    {groupOptions.find((item) => item.id === form.getFieldValue('hotWordGroupId'))?.groupName || '已选择'}
                  </Tag>
                ) : (
                  <Tag>未绑定热词组</Tag>
                )}
              </div>
              <div className="markdown-preview"><ReactMarkdown>{previewContent}</ReactMarkdown></div>
            </Col>
          </Row>
        </Form>
      </Drawer>
    </div>
  );
};

export default PromptTemplates;