import React, { useState, useEffect } from 'react';
import { Table, Card, Button, Space, Tag, message, Modal } from 'antd';
import { PlusOutlined, ExclamationCircleOutlined } from '@ant-design/icons';
import { useNavigate } from 'react-router-dom';
import * as service from './service';
import type { WorkflowDefinition, WorkflowDefinitionQuery, WorkflowCategory } from './types';
import { DEFAULT_PAGE_SIZE, DEFAULT_CURRENT } from '@/utils/page';
import EditModal from './components/EditModal';

const { confirm } = Modal;

const WorkflowDefinitionList: React.FC = () => {
    const navigate = useNavigate();
    const [loading, setLoading] = useState(false);
    const [pageData, setPageData] = useState<{
        content: WorkflowDefinition[];
        totalElements: number;
        size: number;
        number: number;
    } | null>(null);
    const [modalVisible, setModalVisible] = useState(false);
    const [currentRecord, setCurrentRecord] = useState<WorkflowDefinition>();
    const [categories, setCategories] = useState<WorkflowCategory[]>([]);
    const [query, setQuery] = useState<WorkflowDefinitionQuery>({
        pageNum: DEFAULT_CURRENT - 1,
        pageSize: DEFAULT_PAGE_SIZE
    });

    const loadData = async (params: WorkflowDefinitionQuery) => {
        setLoading(true);
        try {
            const data = await service.getDefinitions(params);
            setPageData(data);
        } catch (error) {
            if (error instanceof Error) {
                message.error(error.message);
            }
        } finally {
            setLoading(false);
        }
    };

    const loadCategories = async () => {
        try {
            const data = await service.getWorkflowCategories();
            setCategories(data);
        } catch (error) {
            console.error('加载工作流分类失败:', error);
            message.error('加载工作流分类失败');
        }
    };

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

    const handleCreateFlow = () => {
        setCurrentRecord(undefined);
        setModalVisible(true);
    };

    const handleEditFlow = (record: WorkflowDefinition) => {
        setCurrentRecord(record);
        setModalVisible(true);
    };

    const handleDesignFlow = (record: WorkflowDefinition) => {
        // 新的React Flow设计器路径
        navigate(`/workflow2/design/${record.id}`);
    };

    const handleModalClose = () => {
        setModalVisible(false);
        setCurrentRecord(undefined);
    };

    const handleDeploy = async (id: number) => {
        confirm({
            title: '确认发布',
            icon: <ExclamationCircleOutlined />,
            content: '确定要发布该流程定义吗？发布后将不能修改。',
            onOk: async () => {
                try {
                    await service.publishDefinition(id);
                    message.success('发布成功');
                    loadData(query);
                } catch (error) {
                    if (error instanceof Error) {
                        message.error(error.message);
                    }
                }
            },
        });
    };

    const handleDelete = async (id: number) => {
        confirm({
            title: '确认删除',
            icon: <ExclamationCircleOutlined />,
            content: '确定要删除该流程定义吗？删除后不可恢复。',
            onOk: async () => {
                try {
                    await service.deleteDefinition(id);
                    message.success('删除成功');
                    loadData(query);
                } catch (error) {
                    if (error instanceof Error) {
                        message.error(error.message);
                    }
                }
            },
        });
    };

    const handleStartFlow = async (record: WorkflowDefinition) => {
        try {
            await service.startWorkflowInstance(record.key, record.category);
            message.success('流程启动成功');
        } catch (error) {
            if (error instanceof Error) {
                message.error(error.message);
            }
        }
    };

    const columns = [
        {
            title: '流程名称',
            dataIndex: 'name',
            key: 'name',
        },
        {
            title: '流程标识',
            dataIndex: 'key',
            key: 'key',
        },
        {
            title: '流程分类',
            dataIndex: 'category',
            key: 'category',
            render: (category: string) => {
                const categoryInfo = categories.find(c => c.code === category);
                return categoryInfo?.label || category;
            }
        },
        {
            title: '触发方式',
            dataIndex: 'triggers',
            key: 'triggers',
            render: (triggers: string[], record: WorkflowDefinition) => {
                const categoryInfo = categories.find(c => c.code === record.category);
                return (triggers || [])?.map(triggerCode => {
                    const triggerInfo = categoryInfo?.supportedTriggers?.find(t => t.code === triggerCode);
                    return (
                        <Tag key={triggerCode}>
                            {triggerInfo?.label || triggerCode}
                        </Tag>
                    );
                });
            }
        },
        {
            title: '版本',
            dataIndex: 'flowVersion',
            key: 'flowVersion',
        },
        {
            title: '状态',
            dataIndex: 'status',
            key: 'status',
            render: (status: string) => (
                <Tag color={status === 'DRAFT' ? 'orange' : 'green'}>
                    {status === 'DRAFT' ? '草稿' : '已发布'}
                </Tag>
            ),
        },
        {
            title: '描述',
            dataIndex: 'description',
            key: 'description',
            ellipsis: true,
        },
        {
            title: '操作',
            key: 'action',
            fixed: 'right' as const,
            width: 220,
            render: (_: any, record: WorkflowDefinition) => (
                <Space size="middle">
                    {record.status === 'DRAFT' && (
                        <>
                            <a onClick={() => handleEditFlow(record)}>编辑</a>
                            <a onClick={() => handleDesignFlow(record)}>设计(React Flow)</a>
                        </>
                    )}
                    {record.status === 'DRAFT' && (
                        <a onClick={() => handleDeploy(record.id)}>发布</a>
                    )}
                    <a onClick={() => handleDelete(record.id)}>删除</a>
                    {record.status !== 'DRAFT' && (
                        <a onClick={() => handleStartFlow(record)}>启动</a>
                    )}
                </Space>
            ),
        },
    ];

    return (
        <Card
            title={
                <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
                    <span>工作流定义管理 (React Flow版本)</span>
                    <Button type="primary" icon={<PlusOutlined />} onClick={handleCreateFlow}>
                        新建流程
                    </Button>
                </div>
            }
        >
            <Table
                columns={columns}
                dataSource={pageData?.content}
                loading={loading}
                rowKey="id"
                scroll={{ x: 1400 }}
                pagination={{
                    current: (query.pageNum || 0) + 1,
                    pageSize: query.pageSize,
                    total: pageData?.totalElements || 0,
                    onChange: (page, pageSize) => setQuery({
                        ...query,
                        pageNum: page - 1,
                        pageSize
                    }),
                }}
            />
            <EditModal
                visible={modalVisible}
                onClose={handleModalClose}
                onSuccess={() => loadData(query)}
                record={currentRecord}
            />
        </Card>
    );
};

export default WorkflowDefinitionList;
