Swap UX Cleanup (#339)

Fixes #226
Fixes #383

Added a simple check to ensure that swap rates exist so we don't get a NaN error, which would be confusing to users.

Instead, the form is hidden and a spinner is shown until the bityRates are ready for the user.

* adds spinner while fetching

* added error on top of input

* removed classnames prop and added cn

* added simple err mssge

* css fixes and disabled button

* better err mssge generation and fixed swap details

* minor typo

* added redux notification on unreachable error

* minheight for err message and swap update on redux change

* fixed formatting and removed className prop

common/containers/Tabs/Swap/components/CurrencySwap.scss

@@ -1,4 +1,4 @@
-@import "common/sass/variables";
+@import 'common/sass/variables';
 
 .CurrencySwap {
   text-align: center;
@@ -13,6 +13,30 @@
     display: inline-block;
     vertical-align: top;
   }
+  &-input-group {
+    display: inline-block;
+  }
+  &-error-message {
+    display: block;
+    min-height: 25px;
+    color: $brand-danger;
+    text-align: left;
+  }
+  &-inner-wrap {
+    display: block;
+  }
+  @media (min-width: $screen-xs-min) {
+    &-inner-wrap {
+      display: flex;
+      align-items: center;
+      justify-content: center;
+    }
+  }
+  &-dropdown {
+    display: inline-block;
+    margin-top: 0.6rem;
+    margin-bottom: 0.6rem;
+  }
 
   &-input {
     width: 100%;

common/containers/Tabs/Swap/components/CurrencySwap.tsx

@@ -13,6 +13,7 @@ import translate from 'translations';
 import { combineAndUpper, toFixedIfLarger } from 'utils/formatters';
 import './CurrencySwap.scss';
 import { Dropdown } from 'components/ui';
+import Spinner from 'components/ui/Spinner';
 
 export interface StateProps {
   bityRates: any;
@@ -36,6 +37,8 @@ export interface ActionProps {
 interface State {
   disabled: boolean;
   showedMinMaxError: boolean;
+  originErr: string;
+  destinationErr: string;
 }
 
 export default class CurrencySwap extends Component<
@@ -44,9 +47,31 @@ export default class CurrencySwap extends Component<
 > {
   public state = {
     disabled: true,
-    showedMinMaxError: false
+    showedMinMaxError: false,
+    originErr: '',
+    destinationErr: ''
   };
 
+  public componentWillReceiveProps(newProps) {
+    const {
+      originAmount,
+      originKind,
+      destinationKind,
+      destinationAmount
+    } = newProps;
+    if (
+      originKind !== this.props.originKind ||
+      destinationKind !== this.props.destinationKind
+    ) {
+      this.setDisabled(
+        originAmount,
+        originKind,
+        destinationKind,
+        destinationAmount
+      );
+    }
+  }
+
   public isMinMaxValid = (amount, kind) => {
     let bityMin;
     let bityMax;
@@ -70,38 +95,86 @@ export default class CurrencySwap extends Component<
     return !(hasOriginAmountAndDestinationAmount && minMaxIsValid);
   };
 
-  public setDisabled(originAmount, originKind, destinationAmount) {
+  public setDisabled(
+    originAmount,
+    originKind,
+    destinationKind,
+    destinationAmount
+  ) {
     const disabled = this.isDisabled(
       originAmount,
       originKind,
       destinationAmount
     );
 
-    if (disabled && originAmount && !this.state.showedMinMaxError) {
+    if (disabled && originAmount) {
       const { bityRates } = this.props;
       const ETHMin = generateKindMin(bityRates.BTCETH, 'ETH');
       const ETHMax = generateKindMax(bityRates.BTCETH, 'ETH');
       const REPMin = generateKindMin(bityRates.BTCREP, 'REP');
 
-      const notificationMessage = `
-        Minimum amount ${bityConfig.BTCMin} BTC,
-        ${toFixedIfLarger(ETHMin, 3)} ETH.
-        Max amount ${bityConfig.BTCMax} BTC,
-        ${toFixedIfLarger(ETHMax, 3)} ETH, or
-        ${toFixedIfLarger(REPMin, 3)} REP
-      `;
-
-      this.setState(
-        {
-          disabled,
-          showedMinMaxError: true
-        },
-        () => {
-          this.props.showNotification('danger', notificationMessage, 10000);
+      const getRates = kind => {
+        let minAmount;
+        let maxAmount;
+        switch (kind) {
+          case 'BTC':
+            minAmount = toFixedIfLarger(bityConfig.BTCMin, 3);
+            maxAmount = toFixedIfLarger(bityConfig.BTCMax, 3);
+            break;
+          case 'ETH':
+            minAmount = toFixedIfLarger(ETHMin, 3);
+            maxAmount = toFixedIfLarger(ETHMax, 3);
+            break;
+          case 'REP':
+            minAmount = toFixedIfLarger(REPMin, 3);
+            break;
+          default:
+            if (this.state.showedMinMaxError) {
+              this.setState(
+                {
+                  showedMinMaxError: true
+                },
+                () => {
+                  this.props.showNotification(
+                    'danger',
+                    "Couldn't get match currency kind. Something went terribly wrong",
+                    10000
+                  );
+                }
+              );
+            }
         }
+        return { minAmount, maxAmount };
+      };
+
+      const createErrString = (kind, amount, rate) => {
+        let errString;
+        if (amount > rate.maxAmount) {
+          errString = `Maximum ${kind} is ${rate.maxAmount} ${kind}`;
+        } else {
+          errString = `Minimum ${kind} is ${rate.minAmount} ${kind}`;
+        }
+
+        return errString;
+      };
+      const originRate = getRates(originKind);
+      const destinationRate = getRates(destinationKind);
+      const originErr = createErrString(originKind, originAmount, originRate);
+      const destinationErr = createErrString(
+        destinationKind,
+        destinationAmount,
+        destinationRate
       );
+
+      this.setState({
+        originErr,
+        destinationErr,
+        disabled: true
+      });
     } else {
       this.setState({
+        originErr: '',
+        destinationErr: '',
         disabled
       });
     }
@@ -114,7 +187,12 @@ export default class CurrencySwap extends Component<
   public setOriginAndDestinationToNull = () => {
     this.props.originAmountSwap(null);
     this.props.destinationAmountSwap(null);
-    this.setDisabled(null, this.props.originKind, null);
+    this.setDisabled(
+      null,
+      this.props.originKind,
+      this.props.destinationKind,
+      null
+    );
   };
 
   public onChangeOriginAmount = (
@@ -129,7 +207,12 @@ export default class CurrencySwap extends Component<
       this.props.originAmountSwap(originAmountAsNumber);
       const destinationAmount = originAmountAsNumber * bityRate;
       this.props.destinationAmountSwap(destinationAmount);
-      this.setDisabled(originAmountAsNumber, originKind, destinationAmount);
+      this.setDisabled(
+        originAmountAsNumber,
+        originKind,
+        destinationKind,
+        destinationAmount
+      );
     } else {
       this.setOriginAndDestinationToNull();
     }
@@ -147,7 +230,12 @@ export default class CurrencySwap extends Component<
       const bityRate = this.props.bityRates[pairNameReversed];
       const originAmount = destinationAmountAsNumber * bityRate;
       this.props.originAmountSwap(originAmount);
-      this.setDisabled(originAmount, originKind, destinationAmountAsNumber);
+      this.setDisabled(
+        originAmount,
+        originKind,
+        destinationKind,
+        destinationAmountAsNumber
+      );
     } else {
       this.setOriginAndDestinationToNull();
     }
@@ -160,69 +248,90 @@ export default class CurrencySwap extends Component<
       originKind,
       destinationKind,
       destinationKindOptions,
-      originKindOptions
+      originKindOptions,
+      bityRates
     } = this.props;
 
+    const { originErr, destinationErr } = this.state;
+
     const OriginKindDropDown = Dropdown as new () => Dropdown<
       typeof originKind
     >;
     const DestinationKindDropDown = Dropdown as new () => Dropdown<
       typeof destinationKind
     >;
-
+    const pairName = combineAndUpper(originKind, destinationKind);
+    const bityLoaded = bityRates[pairName];
     return (
       <article className="CurrencySwap">
         <h1 className="CurrencySwap-title">{translate('SWAP_init_1')}</h1>
-
-        <div className="form-inline">
-          <input
-            className={`CurrencySwap-input form-control ${String(
-              originAmount
-            ) !== '' && this.isMinMaxValid(originAmount, originKind)
-              ? 'is-valid'
-              : 'is-invalid'}`}
-            type="number"
-            placeholder="Amount"
-            value={originAmount || originAmount === 0 ? originAmount : ''}
-            onChange={this.onChangeOriginAmount}
-          />
-
-          <OriginKindDropDown
-            ariaLabel={`change origin kind. current origin kind ${originKind}`}
-            options={originKindOptions}
-            value={originKind}
-            onChange={this.props.originKindSwap}
-            size="smr"
-            color="default"
-          />
-
-          <h1 className="CurrencySwap-divider">{translate('SWAP_init_2')}</h1>
-
-          <input
-            className={`CurrencySwap-input form-control ${String(
-              destinationAmount
-            ) !== '' && this.isMinMaxValid(originAmount, originKind)
-              ? 'is-valid'
-              : 'is-invalid'}`}
-            type="number"
-            placeholder="Amount"
-            value={
-              destinationAmount || destinationAmount === 0
-                ? destinationAmount
-                : ''
-            }
-            onChange={this.onChangeDestinationAmount}
-          />
-
-          <DestinationKindDropDown
-            ariaLabel={`change destination kind. current destination kind ${destinationKind}`}
-            options={destinationKindOptions}
-            value={destinationKind}
-            onChange={this.props.destinationKindSwap}
-            size="smr"
-            color="default"
-          />
-        </div>
+        {bityLoaded ? (
+          <div className="form-inline CurrencySwap-inner-wrap">
+            <div className="CurrencySwap-input-group">
+              <span className="CurrencySwap-error-message">{originErr}</span>
+              <input
+                className={`CurrencySwap-input form-control ${
+                  String(originAmount) !== '' &&
+                  this.isMinMaxValid(originAmount, originKind)
+                    ? 'is-valid'
+                    : 'is-invalid'
+                }`}
+                type="number"
+                placeholder="Amount"
+                value={originAmount || originAmount === 0 ? originAmount : ''}
+                onChange={this.onChangeOriginAmount}
+              />
+              <div className="CurrencySwap-dropdown">
+                <OriginKindDropDown
+                  ariaLabel={`change origin kind. current origin kind ${
+                    originKind
+                  }`}
+                  options={originKindOptions}
+                  value={originKind}
+                  onChange={this.props.originKindSwap}
+                  size="smr"
+                  color="default"
+                />
+              </div>
+            </div>
+            <h1 className="CurrencySwap-divider">{translate('SWAP_init_2')}</h1>
+            <div className="CurrencySwap-input-group">
+              <span className="CurrencySwap-error-message">
+                {destinationErr}
+              </span>
+              <input
+                className={`CurrencySwap-input form-control ${
+                  String(destinationAmount) !== '' &&
+                  this.isMinMaxValid(originAmount, originKind)
+                    ? 'is-valid'
+                    : 'is-invalid'
+                }`}
+                type="number"
+                placeholder="Amount"
+                value={
+                  destinationAmount || destinationAmount === 0
+                    ? destinationAmount
+                    : ''
+                }
+                onChange={this.onChangeDestinationAmount}
+              />
+              <div className="CurrencySwap-dropdown">
+                <DestinationKindDropDown
+                  ariaLabel={`change destination kind. current destination kind ${
+                    destinationKind
+                  }`}
+                  options={destinationKindOptions}
+                  value={destinationKind}
+                  onChange={this.props.destinationKindSwap}
+                  size="smr"
+                  color="default"
+                />
+              </div>
+            </div>
+          </div>
+        ) : (
+          <Spinner />
+        )}
 
         <div className="CurrencySwap-submit">
           <SimpleButton

common/containers/Tabs/Swap/components/SwapInfoHeader.tsx

@@ -66,9 +66,7 @@ export default class SwapInfoHeader extends Component<SwapInfoHeaderProps, {}> {
           {/*Amount to send*/}
           {!this.isExpanded() && (
             <div className={this.computedClass()}>
-              <h3 className="SwapInfo-details-block-value">
-                {` ${originAmount} ${originKind}`}
-              </h3>
+              <h3 className="SwapInfo-details-block-value">{` ${originAmount} ${originKind}`}</h3>
               <p className="SwapInfo-details-block-label">
                 {translate('SEND_amount')}
               </p>
@@ -113,7 +111,7 @@ export default class SwapInfoHeader extends Component<SwapInfoHeaderProps, {}> {
               {`${computedOriginDestinationRatio &&
                 toFixedIfLarger(
                   computedOriginDestinationRatio
-                )} ${originKind}/${destinationKind}`}
+                )} ${destinationKind}/${originKind}`}
             </h3>
             <p className="SwapInfo-details-block-label">
               {translate('SWAP_your_rate')}