From fba35632a369094f78caa7ace2e6fb0f058d56ef Mon Sep 17 00:00:00 2001
From: Jaco Greeff <jacogr@gmail.com>
Date: Tue, 4 Aug 2020 11:02:59 +0200
Subject: [PATCH] Relay-chain transfers (#3329)

---
 .../page-parachains/src/Overview/Register.tsx |  14 ++-
 .../page-parachains/src/Overview/index.tsx    |   2 +
 packages/page-parachains/src/Transfer.tsx     | 102 ++++++++++++++++++
 3 files changed, 110 insertions(+), 8 deletions(-)
 create mode 100644 packages/page-parachains/src/Transfer.tsx

diff --git a/packages/page-parachains/src/Overview/Register.tsx b/packages/page-parachains/src/Overview/Register.tsx
index a4181d46ca..cba8df082f 100644
--- a/packages/page-parachains/src/Overview/Register.tsx
+++ b/packages/page-parachains/src/Overview/Register.tsx
@@ -78,14 +78,12 @@ function Register ({ isDisabled, nextFreeId = BN_THOUSAND, sudoKey }: Props): Re
 
   return (
     <>
-      <div className='ui--Row-buttons'>
-        <Button
-          icon='plus'
-          isDisabled={isDisabled || !sudoKey}
-          label={t<string>('Register a parachain')}
-          onClick={onOpen}
-        />
-      </div>
+      <Button
+        icon='plus'
+        isDisabled={isDisabled || !sudoKey}
+        label={t<string>('Register a parachain')}
+        onClick={onOpen}
+      />
       {isOpen && (
         <Modal
           header={t<string>('Register a parachain')}
diff --git a/packages/page-parachains/src/Overview/index.tsx b/packages/page-parachains/src/Overview/index.tsx
index 33b8a074d9..2d166c71e3 100644
--- a/packages/page-parachains/src/Overview/index.tsx
+++ b/packages/page-parachains/src/Overview/index.tsx
@@ -9,6 +9,7 @@ import React from 'react';
 import { Button } from '@polkadot/react-components';
 import { useApi, useCall } from '@polkadot/react-hooks';
 
+import Transfer from '../Transfer';
 import Parachains from './Parachains';
 import Register from './Register';
 import Summary from './Summary';
@@ -30,6 +31,7 @@ function Overview ({ isMine, sudoKey }: Props): React.ReactElement<Props> {
         parachainCount={parachains?.length || 0}
       />
       <Button.Group>
+        <Transfer parachains={parachains} />
         <Register
           isDisabled={!isMine}
           nextFreeId={nextFreeId}
diff --git a/packages/page-parachains/src/Transfer.tsx b/packages/page-parachains/src/Transfer.tsx
new file mode 100644
index 0000000000..85a45129ab
--- /dev/null
+++ b/packages/page-parachains/src/Transfer.tsx
@@ -0,0 +1,102 @@
+// Copyright 2017-2020 @polkadot/app-parachains authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { DeriveParachain } from '@polkadot/api-derive/types';
+
+import BN from 'bn.js';
+import React, { useMemo, useState } from 'react';
+import { Button, Dropdown, Input, InputAddress, InputBalance, Modal, TxButton } from '@polkadot/react-components';
+import { useAccounts, useToggle } from '@polkadot/react-hooks';
+import { Available } from '@polkadot/react-query';
+
+import { useTranslation } from './translate';
+
+interface Props {
+  parachains?: DeriveParachain[];
+}
+
+function Transfer ({ parachains }: Props): React.ReactElement<Props> {
+  const { t } = useTranslation();
+  const { allAccounts } = useAccounts();
+  const [isVisible, toggleVisible] = useToggle();
+  const [accountId, setAccountId] = useState<string | null>(null);
+  const [amount, setAmount] = useState<BN | undefined>();
+  const [toId, setToId] = useState<string | null>();
+  const [remark, setRemark] = useState('');
+
+  const idOptions = useMemo((): { text: string, value: string }[] => {
+    return (parachains || []).map(({ id }) => ({ text: id.toString(), value: id.toString() }));
+  }, [parachains]);
+
+  return (
+    <>
+      <Button
+        icon='paper-plane'
+        isDisabled={!parachains?.length || !allAccounts.length}
+        label={t<string>('Transfer to chain')}
+        onClick={toggleVisible}
+      />
+      {isVisible && (
+        <Modal
+          header={t<string>('Transfer to parachain')}
+          size='large'
+        >
+          <Modal.Content>
+            <Modal.Columns>
+              <Modal.Column>
+                <InputAddress
+                  help={t<string>('The account you will send funds from.')}
+                  label={t<string>('send from account')}
+                  labelExtra={
+                    <Available
+                      label={t<string>('transferrable ')}
+                      params={accountId}
+                    />
+                  }
+                  onChange={setAccountId}
+                  type='account'
+                />
+                <Dropdown
+                  defaultValue={idOptions[0].value}
+                  help={t<string>('the parachain that will receive the transfer of tokens.')}
+                  label={t<string>('the parachain to transfer to')}
+                  onChange={setToId}
+                  options={idOptions}
+                />
+                <InputBalance
+                  autoFocus
+                  help={t<string>('the amount that should be transferred. It needs to be less than the available balance')}
+                  isZeroable={false}
+                  label={t<string>('amount')}
+                  onChange={setAmount}
+                />
+                <Input
+                  help={t<string>('A remark that is associated with this transfer. This can be any comment that indicates the reason.')}
+                  label={t<string>('transfer remark/comment')}
+                  maxLength={32}
+                  onChange={setRemark}
+                />
+              </Modal.Column>
+              <Modal.Column>
+                <p>{t<string>('Transfer an amount from a specific account into a parachain.')}</p>
+                <p>{t<string>('Once transferred the amount will become available on the parachain for use.')}</p>
+              </Modal.Column>
+            </Modal.Columns>
+          </Modal.Content>
+          <Modal.Actions onCancel={toggleVisible}>
+            <TxButton
+              accountId={accountId}
+              isDisabled={!toId || !amount?.gtn(0)}
+              label={t<string>('Send')}
+              params={[toId, amount, remark]}
+              tx='parachains.transferToParachain'
+            />
+          </Modal.Actions>
+        </Modal>
+      )}
+    </>
+  );
+}
+
+export default React.memo(Transfer);