import React from 'react';
import { PropTypes } from 'react';
import classNames from 'classnames';
import PureRenderMixin from 'react-addons-pure-render-mixin';
import omit from 'omit.js';
import warning from 'warning';
import assign from 'object-assign';
import FormItem from './FormItem';
import createDOMForm from 'rc-form/lib/createDOMForm';
import { FIELD_META_PROP } from './constants';

export interface FormCreateOption {
  onFieldsChange?: (props: any, fields: Array<any>) => void;
  mapPropsToFields?: (props: any) => void;
  withRef?: boolean;
}

export interface FormProps {
  horizontal?: boolean;
  inline?: boolean;
  vertical?: boolean;
  form?: WrappedFormUtils;
  onSubmit?: React.FormEventHandler<any>;
  style?: React.CSSProperties;
  className?: string;
  prefixCls?: string;
}

// function create
export type WrappedFormUtils = {
  /** 获取一组输入控件的值，如不传入参数，则获取全部组件的值 */
  getFieldsValue(fieldNames?: Array<string>): Object;
  /** 获取一个输入控件的值*/
  getFieldValue(fieldName: string): any;
  /** 设置一组输入控件的值*/
  setFieldsValue(obj: Object): void;
  /** 设置一组输入控件的值*/
  setFields(obj: Object): void;
  /** 校验并获取一组输入域的值与 Error */
  validateFields(fieldNames: Array<string>, options: Object, callback: (erros: any, values: any) => void): any;
  validateFields(fieldNames: Array<string>, callback: (erros: any, values: any) => void): any;
  validateFields(options: Object, callback: (erros: any, values: any) => void): any;
  validateFields(callback: (erros: any, values: any) => void): any;
  /** 与 `validateFields` 相似，但校验完后，如果校验不通过的菜单域不在可见范围内，则自动滚动进可见范围 */
  validateFieldsAndScroll(fieldNames?: Array<string>,
                          options?: Object,
                          callback?: (erros: any, values: any) => void): void;
  /** 获取某个输入控件的 Error */
  getFieldError(name: string): Object[];
  /** 判断一个输入控件是否在校验状态*/
  isFieldValidating(name: string): boolean;
  /** 重置一组输入控件的值与状态，如不传入参数，则重置所有组件 */
  resetFields(names?: Array<string>): void;

  getFieldDecorator(id: string, options: {
    /** 子节点的值的属性，如 Checkbox 的是 'checked' */
    valuePropName?: string;
    /** 子节点的初始值，类型、可选值均由子节点决定 */
    initialValue?: any;
    /** 收集子节点的值的时机 */
    trigger?: string;
    /** 可以把 onChange 的参数转化为控件的值，例如 DatePicker 可设为：(date, dateString) => dateString */
    getValueFromEvent?: (...args: any[]) => any;
    /** 校验子节点值的时机 */
    validateTrigger?: string;
    /** 校验规则，参见 [async-validator](https://github.com/yiminghe/async-validator) */
    rules?: Array<any>;
    /** 是否和其他控件互斥，特别用于 Radio 单选控件 */
    exclusive?: boolean;
  }): (node: React.ReactNode) => React.ReactNode;
}

export interface FormComponentProps {
  form?: WrappedFormUtils;
}

export class FormComponent extends React.Component<FormComponentProps, {}> {
}

export interface ComponentDecorator {
  <T extends (typeof FormComponent)>(component: T): T;
}

let warnedGetFieldProps = false;

export default class Form extends React.Component<FormProps, any> {
  static defaultProps = {
    prefixCls: 'ant-form',
    onSubmit(e) {
      e.preventDefault();
    },
  };

  static propTypes = {
    prefixCls: React.PropTypes.string,
    vertical: React.PropTypes.bool,
    horizontal: React.PropTypes.bool,
    inline: React.PropTypes.bool,
    children: React.PropTypes.any,
    onSubmit: React.PropTypes.func,
  };

  static Item = FormItem;

  static create = (options?: FormCreateOption): ComponentDecorator => {
    const formWrapper = createDOMForm(assign({
      fieldNameProp: 'id',
    }, options, {
      fieldMetaProp: FIELD_META_PROP,
    }));

    /* eslint-disable react/prefer-es6-class */
    return (Component) => formWrapper(React.createClass({
      propTypes: {
        form: PropTypes.object.isRequired,
      },
      childContextTypes: {
        form: PropTypes.object.isRequired,
      },
      getChildContext() {
        return {
          form: this.props.form,
        };
      },
      componentWillMount() {
        if (!warnedGetFieldProps) {
          this.getFieldProps = this.props.form.getFieldProps;
        }
      },
      deprecatedGetFieldProps(name, option) {
        if (!warnedGetFieldProps) {
          warnedGetFieldProps = true;
          warning(
            false,
            '`getFieldProps` is not recommended, please use `getFieldDecorator` instead'
          );
        }
        return this.getFieldProps(name, option);
      },
      render() {
        if (!warnedGetFieldProps) {
          this.props.form.getFieldProps = this.deprecatedGetFieldProps;
        }

        const withRef: any = {};
        if (options && options.withRef) {
          withRef.ref = 'formWrappedComponent';
        }
        return <Component {...this.props} {...withRef} />;
      },
    }));
  };

  constructor(props) {
    super(props);

    warning(!props.form, 'It is unnecessary to pass `form` to `Form` after antd@1.7.0.');
  }

  shouldComponentUpdate(...args) {
    return PureRenderMixin.shouldComponentUpdate.apply(this, args);
  }

  render() {
    const { prefixCls, className, inline, horizontal, vertical } = this.props;
    const formClassName = classNames({
      [`${prefixCls}`]: true,
      [`${prefixCls}-horizontal`]: horizontal,
      [`${prefixCls}-vertical`]: vertical,
      [`${prefixCls}-inline`]: inline,
      [className]: !!className,
    });

    const formProps = omit(this.props, [
      'prefixCls',
      'className',
      'inline',
      'horizontal',
      'vertical',
      'form',
    ]);

    return <form {...formProps} className={formClassName} />;
  }
}