/**
 * 教师端 - 创建Agent页面
 * 对应原始 index.html 的 create-agent section (4步向导)
 * 复用原始HTML的4步表单逻辑
 */
import { useState, useEffect } from 'react';
import { Steps, Card, Form, Input, Select, Button, Space, Checkbox, message, Row, Col, Modal } from 'antd';
import {
  InfoCircleOutlined,
  AppstoreOutlined,
  DatabaseOutlined,
  BranchesOutlined,
  ArrowLeftOutlined,
  ArrowRightOutlined,
  CheckOutlined,
} from '@ant-design/icons';
import { motion } from 'framer-motion';
import knowledgeService from '../../services/knowledgeService';
import agentService from '../../services/agentService';
import WorkflowEditor from '../../components/WorkflowEditor';

const { TextArea } = Input;

const CreateAgent = () => {
  const [form] = Form.useForm();
  const [currentStep, setCurrentStep] = useState(0);
  const [submitting, setSubmitting] = useState(false); // 创建Agent的loading
  const [aiGenerating, setAiGenerating] = useState(false); // AI生成工作流的loading
  const [selectedPlugins, setSelectedPlugins] = useState([]);
  const [selectedKnowledgeBases, setSelectedKnowledgeBases] = useState([]);
  const [knowledgeBases, setKnowledgeBases] = useState([]);
  const [workflow, setWorkflow] = useState(null);
  const [showWorkflowEditor, setShowWorkflowEditor] = useState(false);

  // 检查是否是编辑模式
  const urlParams = new URLSearchParams(window.location.search);
  const isEditMode = urlParams.get('mode') === 'edit';
  const [editingAgentId, setEditingAgentId] = useState(null);

  // 保存每个步骤的数据
  const [formData, setFormData] = useState({
    name: '',
    description: '',
    subject: '',
    instructor: '',
    type: 'general',
  });

  // 加载知识库列表和编辑数据
  useEffect(() => {
    loadKnowledgeBases();

    // 如果是编辑模式，加载agent数据
    if (isEditMode) {
      const editingAgentStr = localStorage.getItem('editingAgent');
      if (editingAgentStr) {
        try {
          const editingAgent = JSON.parse(editingAgentStr);
          setEditingAgentId(editingAgent.id);

          // 设置表单数据
          setFormData({
            name: editingAgent.name || '',
            description: editingAgent.description || '',
            subject: editingAgent.subject || '',
            instructor: editingAgent.instructor || '',
            type: editingAgent.type || 'general',
          });

          // 设置表单初始值
          form.setFieldsValue({
            name: editingAgent.name || '',
            description: editingAgent.description || '',
            subject: editingAgent.subject || '',
            instructor: editingAgent.instructor || '',
            type: editingAgent.type || 'general',
          });

          // 设置其他数据
          setSelectedPlugins(editingAgent.plugins || []);
          setSelectedKnowledgeBases(editingAgent.knowledgeBases || []);
          setWorkflow(editingAgent.workflow || null);

          // 清除localStorage
          localStorage.removeItem('editingAgent');
        } catch (error) {
          console.error('加载编辑数据失败:', error);
        }
      }
    }
  }, [isEditMode]);

  const loadKnowledgeBases = async () => {
    try {
      const res = await knowledgeService.getKnowledgeBases();
      setKnowledgeBases(res.data || []);
    } catch (error) {
      console.error('加载知识库失败:', error);
    }
  };

  // 可用插件列表（对应原始HTML的插件选项）
  const availablePlugins = [
    {
      id: 'code',
      name: '代码执行',
      icon: '💻',
      description: '允许学生编写和执行Python代码，实时获取结果',
      color: '#10b981',
    },
    {
      id: 'visualization',
      name: '3D可视化',
      icon: '📊',
      description: '生成交互式3D图形，帮助学生理解数学概念',
      color: '#f97316',
    },
    {
      id: 'mindmap',
      name: '思维导图',
      icon: '🗺️',
      description: '创建结构化的思维导图，帮助学生梳理知识点',
      color: '#8b5cf6',
    },
  ];

  // Agent类型选项
  const agentTypes = [
    { value: 'educational', label: '教育辅导' },
    { value: 'programming', label: '编程辅助' },
    { value: 'math', label: '数学辅导' },
    { value: 'general', label: '通用助手' },
  ];

  // 步骤配置
  const steps = [
    {
      title: '基本信息',
      icon: <InfoCircleOutlined />,
    },
    {
      title: '插件选择',
      icon: <AppstoreOutlined />,
    },
    {
      title: '知识库',
      icon: <DatabaseOutlined />,
    },
    {
      title: '工作流',
      icon: <BranchesOutlined />,
    },
  ];

  // 切换插件选择
  const togglePlugin = (pluginId) => {
    setSelectedPlugins((prev) =>
      prev.includes(pluginId)
        ? prev.filter((id) => id !== pluginId)
        : [...prev, pluginId]
    );
  };

  // 切换知识库选择
  const toggleKnowledgeBase = (kbId) => {
    setSelectedKnowledgeBases((prev) =>
      prev.includes(kbId)
        ? prev.filter((id) => id !== kbId)
        : [...prev, kbId]
    );
  };

  // 生成AI工作流
  const handleGenerateAIWorkflow = async () => {
    try {
      setAiGenerating(true);
      const values = form.getFieldsValue();
      const res = await agentService.generateAIWorkflow({
        name: values.name,
        description: values.description,
        type: values.type,
        plugins: selectedPlugins,
        knowledgeBases: selectedKnowledgeBases,
      });

      if (res.success) {
        setWorkflow(res.data.workflow);
        message.success('AI工作流生成成功');
      }
    } catch (error) {
      message.error('生成工作流失败');
    } finally {
      setAiGenerating(false);
    }
  };

  // 下一步
  const handleNext = async () => {
    try {
      // 验证当前步骤的表单
      if (currentStep === 0) {
        await form.validateFields(['name', 'description', 'type']);
        // 保存第一步的表单数据
        const values = form.getFieldsValue();
        setFormData({
          name: values.name,
          description: values.description,
          subject: values.subject || '',  // subject 可能为空
          instructor: values.instructor || '', // instructor 可能为空
          type: values.type,
        });
      }

      setCurrentStep(currentStep + 1);
    } catch (error) {
      message.error('请填写完整信息');
    }
  };

  // 上一步
  const handlePrev = () => {
    setCurrentStep(currentStep - 1);
    // 返回第一步时，恢复表单数据
    if (currentStep === 1) {
      setTimeout(() => {
        form.setFieldsValue(formData);
      }, 0);
    }
  };

  // 提交创建或更新Agent
  const handleSubmit = async () => {
    try {
      setSubmitting(true);

      const agentData = {
        name: formData.name,
        description: formData.description,
        subject: formData.subject,
        instructor: formData.instructor,
        type: formData.type,
        plugins: selectedPlugins,
        knowledgeBases: selectedKnowledgeBases,
        workflow: workflow || {
          nodes: [],
          edges: [],
        },
      };

      console.log('发送Agent数据:', agentData);

      let res;
      if (isEditMode && editingAgentId) {
        // 更新Agent
        res = await agentService.updateAgent(editingAgentId, agentData);
        if (res.success) {
          message.success('Agent更新成功！');
          // 跳转回列表页
          window.location.href = '/teacher/agents';
        }
      } else {
        // 创建新Agent
        res = await agentService.createAgent(agentData);
        if (res.success) {
          message.success('Agent创建成功！');
          // 重置表单
          form.resetFields();
          setCurrentStep(0);
          setSelectedPlugins([]);
          setSelectedKnowledgeBases([]);
          setWorkflow(null);
          setFormData({
            name: '',
            description: '',
            subject: '',
            instructor: '',
            type: 'general',
          });
        }
      }

      if (!res.success) {
        message.error(res.message || '操作失败');
      }
    } catch (error) {
      console.error('操作失败:', error);
      message.error(error.response?.data?.message || '操作失败');
    } finally {
      setSubmitting(false);
    }
  };

  // 渲染步骤内容
  const renderStepContent = () => {
    switch (currentStep) {
      case 0:
        // 步骤1: 基本信息
        return (
          <motion.div
            initial={{ opacity: 0, x: 20 }}
            animate={{ opacity: 1, x: 0 }}
            transition={{ duration: 0.3 }}
          >
            <Form form={form} layout="vertical" size="large">
              <Form.Item
                label="Agent名称"
                name="name"
                rules={[{ required: true, message: '请输入Agent名称' }]}
              >
                <Input placeholder="例如：Python编程助手" />
              </Form.Item>

              <Form.Item
                label="描述"
                name="description"
                rules={[{ required: true, message: '请输入描述' }]}
              >
                <TextArea
                  rows={4}
                  placeholder="简要描述这个Agent的功能和用途"
                />
              </Form.Item>

              <Row gutter={16}>
                <Col span={12}>
                  <Form.Item label="学科/课程名称" name="subject">
                    <Input placeholder="例如：计算机科学" />
                  </Form.Item>
                </Col>
                <Col span={12}>
                  <Form.Item label="指导教师" name="instructor">
                    <Input placeholder="例如：张老师" />
                  </Form.Item>
                </Col>
              </Row>

              <Form.Item
                label="Agent类型"
                name="type"
                rules={[{ required: true, message: '请选择Agent类型' }]}
              >
                <Select placeholder="选择Agent类型" options={agentTypes} />
              </Form.Item>
            </Form>
          </motion.div>
        );

      case 1:
        // 步骤2: 插件选择
        return (
          <motion.div
            initial={{ opacity: 0, x: 20 }}
            animate={{ opacity: 1, x: 0 }}
            transition={{ duration: 0.3 }}
          >
            <div style={{ marginBottom: '16px' }}>
              <h3 style={{ fontSize: '16px', fontWeight: 600, color: '#1f2937' }}>
                选择Agent可以使用的插件
              </h3>
              <p style={{ fontSize: '14px', color: '#6b7280' }}>
                这些插件将增强Agent的能力，帮助学生更好地学习
              </p>
            </div>

            <Row gutter={[16, 16]}>
              {availablePlugins.map((plugin) => (
                <Col span={24} key={plugin.id}>
                  <motion.div
                    whileHover={{ x: 4 }}
                    style={{
                      padding: '20px',
                      background: selectedPlugins.includes(plugin.id)
                        ? `${plugin.color}10`
                        : '#f8fafc',
                      border: selectedPlugins.includes(plugin.id)
                        ? `2px solid ${plugin.color}`
                        : '2px solid #e5e7eb',
                      borderRadius: '12px',
                      cursor: 'pointer',
                      transition: 'all 0.2s',
                    }}
                    onClick={() => togglePlugin(plugin.id)}
                  >
                    <div style={{ display: 'flex', alignItems: 'center', gap: '16px' }}>
                      <div
                        style={{
                          fontSize: '32px',
                          width: '56px',
                          height: '56px',
                          display: 'flex',
                          alignItems: 'center',
                          justifyContent: 'center',
                          background: `${plugin.color}15`,
                          borderRadius: '12px',
                        }}
                      >
                        {plugin.icon}
                      </div>
                      <div style={{ flex: 1 }}>
                        <div style={{ fontSize: '18px', fontWeight: 600, color: '#1f2937', marginBottom: '4px' }}>
                          {plugin.name}
                        </div>
                        <div style={{ fontSize: '14px', color: '#6b7280' }}>
                          {plugin.description}
                        </div>
                      </div>
                      <Checkbox checked={selectedPlugins.includes(plugin.id)} />
                    </div>
                  </motion.div>
                </Col>
              ))}
            </Row>
          </motion.div>
        );

      case 2:
        // 步骤3: 知识库关联
        return (
          <motion.div
            initial={{ opacity: 0, x: 20 }}
            animate={{ opacity: 1, x: 0 }}
            transition={{ duration: 0.3 }}
          >
            <div style={{ marginBottom: '16px' }}>
              <h3 style={{ fontSize: '16px', fontWeight: 600, color: '#1f2937' }}>
                选择关联的知识库
              </h3>
              <p style={{ fontSize: '14px', color: '#6b7280' }}>
                选择与此Agent相关的知识库，Agent将基于这些知识回答问题
              </p>
            </div>

            {knowledgeBases.length > 0 ? (
              <Row gutter={[16, 16]}>
                {knowledgeBases.map((kb) => (
                  <Col span={12} key={kb.id}>
                    <motion.div
                      whileHover={{ y: -4 }}
                      style={{
                        padding: '16px',
                        background: selectedKnowledgeBases.includes(kb.id)
                          ? 'rgba(16, 185, 129, 0.1)'
                          : 'white',
                        border: selectedKnowledgeBases.includes(kb.id)
                          ? '2px solid #10b981'
                          : '1px solid #e5e7eb',
                        borderRadius: '12px',
                        cursor: 'pointer',
                        transition: 'all 0.2s',
                      }}
                      onClick={() => toggleKnowledgeBase(kb.id)}
                    >
                      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
                        <div>
                          <div style={{ fontSize: '16px', fontWeight: 600, color: '#1f2937' }}>
                            {kb.name}
                          </div>
                          <div style={{ fontSize: '14px', color: '#6b7280', marginTop: '4px' }}>
                            {kb.fileCount || 0} 个文件
                          </div>
                        </div>
                        <Checkbox checked={selectedKnowledgeBases.includes(kb.id)} />
                      </div>
                    </motion.div>
                  </Col>
                ))}
              </Row>
            ) : (
              <div style={{ textAlign: 'center', padding: '40px', color: '#9ca3af' }}>
                <DatabaseOutlined style={{ fontSize: '48px', marginBottom: '16px' }} />
                <div>还没有创建任何知识库</div>
                <Button type="link" style={{ marginTop: '8px' }}>
                  去创建知识库
                </Button>
              </div>
            )}
          </motion.div>
        );

      case 3:
        // 步骤4: 工作流设计
        return (
          <motion.div
            initial={{ opacity: 0, x: 20 }}
            animate={{ opacity: 1, x: 0 }}
            transition={{ duration: 0.3 }}
          >
            <div style={{ marginBottom: '24px' }}>
              <h3 style={{ fontSize: '16px', fontWeight: 600, color: '#1f2937' }}>
                工作流设计
              </h3>
              <p style={{ fontSize: '14px', color: '#6b7280' }}>
                定义Agent如何处理学生的问题和请求
              </p>
            </div>

            <Card
              style={{
                border: '1px solid rgba(139, 92, 246, 0.2)',
                borderRadius: '12px',
                marginBottom: '16px',
              }}
            >
              <Space direction="vertical" size="large" style={{ width: '100%' }}>
                <div>
                  <h4 style={{ fontSize: '16px', fontWeight: 600, marginBottom: '8px' }}>
                    AI自动设计（推荐）
                  </h4>
                  <p style={{ fontSize: '14px', color: '#6b7280', marginBottom: '16px' }}>
                    让AI根据您选择的插件和知识库自动生成最优工作流
                  </p>
                  <Button
                    type="primary"
                    icon={<BranchesOutlined />}
                    loading={aiGenerating}
                    onClick={(e) => {
                      e.stopPropagation();
                      handleGenerateAIWorkflow();
                    }}
                    style={{ backgroundColor: '#8b5cf6' }}
                  >
                    AI自动生成工作流
                  </Button>
                </div>

                {workflow && (
                  <div
                    style={{
                      padding: '16px',
                      background: '#f8fafc',
                      borderRadius: '8px',
                      border: '1px solid #e5e7eb',
                    }}
                  >
                    <div style={{ fontSize: '14px', fontWeight: 500, marginBottom: '8px' }}>
                      工作流已生成
                    </div>
                    <div style={{ fontSize: '12px', color: '#6b7280' }}>
                      包含 {workflow.nodes?.length || 0} 个节点，
                      {workflow.edges?.length || 0} 条连接
                    </div>
                  </div>
                )}

                <div style={{ paddingTop: '16px', borderTop: '1px solid #e5e7eb' }}>
                  <h4 style={{ fontSize: '16px', fontWeight: 600, marginBottom: '8px' }}>
                    跳过工作流配置
                  </h4>
                  <p style={{ fontSize: '14px', color: '#6b7280', marginBottom: '16px' }}>
                    暂时不配置工作流，后续可以在Agent详情中进行配置
                  </p>
                  <Button
                    type="default"
                    icon={<CheckOutlined />}
                    onClick={(e) => {
                      e.stopPropagation();
                      setWorkflow({ nodes: [], edges: [] });
                      message.success('已设置为空工作流，可以直接创建Agent');
                    }}
                    style={{
                      borderColor: '#10b981',
                      color: '#10b981',
                    }}
                  >
                    跳过工作流配置
                  </Button>
                </div>

                <div style={{ paddingTop: '16px', borderTop: '1px solid #e5e7eb' }}>
                  <h4 style={{ fontSize: '16px', fontWeight: 600, marginBottom: '8px' }}>
                    手动设计（高级）
                  </h4>
                  <p style={{ fontSize: '14px', color: '#6b7280' }}>
                    使用可视化编辑器自定义工作流
                  </p>
                  <Button onClick={() => setShowWorkflowEditor(true)}>
                    打开工作流编辑器
                  </Button>
                </div>
              </Space>
            </Card>

            {/* 提示：可以直接创建 */}
            <div
              style={{
                marginTop: '16px',
                padding: '16px',
                background: '#f0f9ff',
                borderRadius: '8px',
                border: '1px solid #bae6fd',
              }}
            >
              <div style={{ fontSize: '14px', color: '#0369a1', marginBottom: '4px', fontWeight: 500 }}>
                💡 提示
              </div>
              <div style={{ fontSize: '14px', color: '#075985' }}>
                工作流设计是可选的。您可以直接点击下方的"创建Agent"按钮，先创建一个基础Agent，后续再配置工作流。
              </div>
            </div>
          </motion.div>
        );

      default:
        return null;
    }
  };

  return (
    <div>
      <div style={{ marginBottom: '32px' }}>
        <h1 style={{ fontSize: '28px', fontWeight: 600, color: '#1f2937', margin: 0 }}>
          {isEditMode ? '编辑Agent' : '创建新的Agent'}
        </h1>
        <p style={{ fontSize: '14px', color: '#6b7280', marginTop: '8px' }}>
          {isEditMode ? '修改您的AI教学助手' : '按照步骤创建您的AI教学助手'}
        </p>
      </div>

      {/* 步骤指示器 */}
      <Card style={{ marginBottom: '24px', border: '1px solid #e5e7eb', borderRadius: '12px' }}>
        <Steps current={currentStep} items={steps} />
      </Card>

      {/* 步骤内容 */}
      <Card style={{ border: '1px solid #e5e7eb', borderRadius: '12px', minHeight: '400px' }}>
        {renderStepContent()}

        {/* 导航按钮 */}
        <div
          style={{
            marginTop: '32px',
            paddingTop: '24px',
            borderTop: '1px solid #e5e7eb',
            display: 'flex',
            justifyContent: 'space-between',
          }}
        >
          <Button
            size="large"
            icon={<ArrowLeftOutlined />}
            onClick={handlePrev}
            disabled={currentStep === 0}
          >
            上一步
          </Button>

          {currentStep < steps.length - 1 ? (
            <Button
              type="primary"
              size="large"
              icon={<ArrowRightOutlined />}
              onClick={handleNext}
              style={{ backgroundColor: '#10b981' }}
            >
              下一步
            </Button>
          ) : (
            <Button
              type="primary"
              size="large"
              icon={<CheckOutlined />}
              onClick={handleSubmit}
              loading={submitting}
              style={{ backgroundColor: '#10b981' }}
            >
              {isEditMode ? '保存修改' : '创建Agent'}
            </Button>
          )}
        </div>
      </Card>

      {/* 工作流编辑器Modal */}
      <Modal
        title="工作流编辑器"
        open={showWorkflowEditor}
        onCancel={() => setShowWorkflowEditor(false)}
        width="90%"
        style={{ top: 20 }}
        footer={null}
        destroyOnClose
      >
        <WorkflowEditor
          value={workflow}
          onChange={(newWorkflow) => setWorkflow(newWorkflow)}
          onSave={(newWorkflow) => {
            setWorkflow(newWorkflow);
            setShowWorkflowEditor(false);
            message.success('工作流已保存');
          }}
        />
      </Modal>
    </div>
  );
};

export default CreateAgent;