:doc
  @name UIAutoInputsave
  @prop {Object} template
  @prop {Function} [onChange]
  @prop {Function} [onError]
  @prop {Function} [onStart]
  @prop {Function} [onFinish]
  @prop {Function} [saveValueModifier]
  @prop {String} [valueKey]
  @prop {String} [className]
  @prop {Number} [debounce]

import * as debounce from 'debounce'

var fns = {onChange: this.onChange, setValue: this.setValue}
div(className=props.className)
  if props.template
    yield input(state.value, fns, state.error)

:module
  export function componentWillMount() {
    this.submit = debounce(this.submit, this.props.debounce || 300);
  }

  export function submit (value) {
    if (this.props.saveValueModifier) value = this.props.saveValueModifier(value);
    var template = this.props.template;
    var valObj = {[this.props.valueKey]: value};
    if (this.props.onStart) this.props.onStart.apply(null, arguments);
    if (!template) return console.warn('No template passed to UIAutoInputSave. Value not saved:', value);
    if (template.input._name) valObj['_name'] = template.input._name.value;

    this.context.forms.create(template)
      .set(valObj)
      .submit((err, res) => {
        err = err || res.error;
        if (err) {
          if (this.props.onError) this.props.onError.apply(null, arguments);
          return this.setState({error: err, value: this.propValue()});
        }
        if (this.props.onFinish) this.props.onFinish.apply(null, arguments);
      });
  }

  export function getInitialState() {
    return {
      value: this.propValue()
    };
  }

  export function getDefaultProps () {
    return {
      valueKey: 'value'
    };
  }

  export function componentWillReceiveProps(props) {
    if (this.isUpToDate()) this.setState({value: this.propValue(props)});
    return true;
  }

  export function isUpToDate() {
    return this.propValue() === this.state.value || !this.state.value;
  }

  export function propValue(props) {
    props = props || this.props
    return props.template && props.template.input && props.template.input.value && props.template.input.value.value;
  }

  export function onChange(evt, value) {
    var val = value != null ? value : evt.target.value;
    if (this.state.value === val) return;
    this.setState({value: val});
    this.submit(val);
  }

  export function setValue (value) {
    if (this.state.value === value) return;
    this.setState({value: value});
    this.submit(value);
  }