import React from "react";
import styles from "./index.less";
import { Form, Input, Select, Button } from "antd";

const { Option } = Select;

class PriceInput extends React.Component {
  static getDerivedStateFromProps(nextProps) {
    // Should be a controlled component.
    if ("value" in nextProps) {
      return {
        ...(nextProps.value || {})
      };
    }
    return null;
  }

  constructor(props) {
    super(props);

    const value = props.value || {};
    this.state = {
      number: value.number || 0,
      currency: value.currency || "rmb"
    };
  }

  handleNumberChange = e => {
    const number = parseInt(e.target.value || 0, 10);
    if (isNaN(number)) {
      return;
    }
    if (!("value" in this.props)) {
      this.setState({ number });
    }
    this.triggerChange({ number });
  };

  handleCurrencyChange = currency => {
    if (!("value" in this.props)) {
      this.setState({ currency });
    }
    this.triggerChange({ currency });
  };

  triggerChange = changedValue => {
    // Should provide an event to pass value to Form.
    const { onChange } = this.props;
    if (onChange) {
      onChange({
        ...this.state,
        ...changedValue
      });
    }
  };

  render() {
    const { size } = this.props;
    const { currency, number } = this.state;
    return (
      <span>
        <Input
          type="text"
          size={size}
          value={number}
          onChange={this.handleNumberChange}
          style={{ width: "65%", marginRight: "3%" }}
        />
        <Select
          value={currency}
          size={size}
          style={{ width: "32%" }}
          onChange={this.handleCurrencyChange}
        >
          <Option value="rmb">RMB</Option>
          <Option value="dollar">Dollar</Option>
        </Select>
      </span>
    );
  }
}

class Demo extends React.Component {
  handleSubmit = e => {
    e.preventDefault();
    this.props.form.validateFields((err, values) => {
      if (!err) {
        console.log("Received values of form: ", values);
      }
    });
  };

  checkPrice = (rule, value, callback) => {
    if (value.number > 0) {
      callback();
      return;
    }
    callback("Price must greater than zero!");
  };

  render() {
    const { getFieldDecorator } = this.props.form;
    return (
      <Form layout="inline" onSubmit={this.handleSubmit}>
        <Form.Item label="Price">
          {getFieldDecorator("price", {
            initialValue: { number: 0, currency: "rmb" },
            rules: [{ validator: this.checkPrice }]
          })(<PriceInput />)}
        </Form.Item>
        <Form.Item>
          <Button type="primary" htmlType="submit">
            Submit
          </Button>
        </Form.Item>
      </Form>
    );
  }
}

const WrappedDemo = Form.create({ name: "customized_form_controls" })(Demo);

export default () => (
  <div className={styles.container}>
    <div id="components-form-demo-customized-form-controls">
      <WrappedDemo />
    </div>
  </div>
);