import React from 'react';
import { Form, Input, Icon, Button } from 'antd';

const FormItem = Form.Item;

let uuid = 0;
class DynamicFieldSet extends React.Component {
  remove = (k) => {
    const { form } = this.props;
    // can use data-binding to get
    const keys = form.getFieldValue('keys');
    // We need at least one passenger
    if (keys.length === 1) {
      return;
    }

    // can use data-binding to set
    form.setFieldsValue({
      keys: keys.filter(key => key !== k),
    });
  };

  add = () => {
    const { form } = this.props;
    // can use data-binding to get
    const keys = form.getFieldValue('keys');
    const nextKeys = keys.concat(uuid);
    uuid += 1;
    // can use data-binding to set
    // important! notify form to detect changes
    form.setFieldsValue({
      keys: nextKeys,
    });
  };

  handleSubmit = (e) => {
    e.preventDefault();
    this.props.form.validateFields((err, values) => {
      if (!err) {
        console.log('Received values of form: ', values);
      }
    });
  };

  render() {
    const { getFieldDecorator, getFieldValue } = this.props.form;
    const formItemLayout = {
      labelCol: {
        xs: { span: 24 },
        sm: { span: 4 },
      },
      wrapperCol: {
        xs: { span: 24 },
        sm: { span: 20 },
      },
    };
    const formItemLayoutWithOutLabel = {
      wrapperCol: {
        xs: { span: 24, offset: 0 },
        sm: { span: 20, offset: 4 },
      },
    };
    getFieldDecorator('keys', { initialValue: [] });
    const keys = getFieldValue('keys');
    const formItems = keys.map((k, index) => (
      <FormItem
        {...(index === 0 ? formItemLayout : formItemLayoutWithOutLabel)}
        label={index === 0 ? 'Passengers' : ''}
        required={false}
        key={k}
      >
        {getFieldDecorator(`names[${k}]`, {
          validateTrigger: ['onChange', 'onBlur'],
          rules: [
            {
              required: true,
              whitespace: true,
              message: "Please input passenger's name or delete this field.",
            },
          ],
        })(
          <Input
            placeholder="passenger name"
            style={{ width: '60%', marginRight: 8 }}
          />
        )}
        {keys.length > 1 ? (
          <Icon
            className="dynamic-delete-button"
            type="minus-circle-o"
            disabled={keys.length === 1}
            onClick={() => this.remove(k)}
          />
        ) : null}
      </FormItem>
    ));
    return (
      <Form onSubmit={this.handleSubmit}>
        {formItems}
        <FormItem {...formItemLayoutWithOutLabel}>
          <Button type="dashed" onClick={this.add} style={{ width: '60%' }}>
            <Icon type="plus" /> Add field
          </Button>
        </FormItem>
        <FormItem {...formItemLayoutWithOutLabel}>
          <Button type="primary" htmlType="submit">
            Submit
          </Button>
        </FormItem>
      </Form>
    );
  }
}

const WrappedDynamicFieldSet = Form.create()(DynamicFieldSet);

export default WrappedDynamicFieldSet;