From 597dfd0a44d698730699e2205930808ed7775274 Mon Sep 17 00:00:00 2001
From: Jaco Greeff <jacogr@gmail.com>
Date: Sun, 2 Aug 2020 10:06:37 +0200
Subject: [PATCH] Slash breakdown (#3315)

---
 packages/page-staking/src/Slashes/Row.tsx   | 57 +++++++++++++++++++
 packages/page-staking/src/Slashes/index.tsx | 61 +++++++++++++++++++++
 packages/page-staking/src/Slashes/types.ts  | 13 +++++
 packages/page-staking/src/index.tsx         | 24 ++++++--
 4 files changed, 150 insertions(+), 5 deletions(-)
 create mode 100644 packages/page-staking/src/Slashes/Row.tsx
 create mode 100644 packages/page-staking/src/Slashes/index.tsx
 create mode 100644 packages/page-staking/src/Slashes/types.ts

diff --git a/packages/page-staking/src/Slashes/Row.tsx b/packages/page-staking/src/Slashes/Row.tsx
new file mode 100644
index 0000000000..7e527bdffe
--- /dev/null
+++ b/packages/page-staking/src/Slashes/Row.tsx
@@ -0,0 +1,57 @@
+// Copyright 2017-2020 @polkadot/app-staking 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 { Slash } from './types';
+
+import React from 'react';
+import { AddressMini, AddressSmall } from '@polkadot/react-components';
+import { FormatBalance } from '@polkadot/react-query';
+import { formatNumber } from '@polkadot/util';
+
+interface Props {
+  slash: Slash;
+  withEra: boolean;
+}
+
+function Row ({ slash: { era, slash: { others, own, payout, reporters, validator }, total }, withEra }: Props): React.ReactElement<Props> {
+  return (
+    <tr>
+      <td className='number'>
+        <h1>{withEra && formatNumber(era)}</h1>
+      </td>
+      <td className='address'>
+        <AddressSmall value={validator} />
+      </td>
+      <td className='number together'>
+        <FormatBalance value={own} />
+      </td>
+      <td className='number together'>
+        <FormatBalance value={total} />
+      </td>
+      <td className='address all'>
+        {others.map(([accountId, balance], index): React.ReactNode => (
+          <AddressMini
+            balance={balance}
+            key={index}
+            value={accountId}
+            withBalance
+          />
+        ))}
+      </td>
+      <td className='address'>
+        {reporters.map((reporter, index): React.ReactNode => (
+          <AddressMini
+            key={index}
+            value={reporter}
+          />
+        ))}
+      </td>
+      <td className='number together'>
+        <FormatBalance value={payout} />
+      </td>
+    </tr>
+  );
+}
+
+export default React.memo(Row);
diff --git a/packages/page-staking/src/Slashes/index.tsx b/packages/page-staking/src/Slashes/index.tsx
new file mode 100644
index 0000000000..6ab6e92c94
--- /dev/null
+++ b/packages/page-staking/src/Slashes/index.tsx
@@ -0,0 +1,61 @@
+// Copyright 2017-2020 @polkadot/app-staking 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 { UnappliedSlash } from '@polkadot/types/interfaces';
+import { Slash } from './types';
+
+import BN from 'bn.js';
+import React, { useMemo } from 'react';
+import { Table } from '@polkadot/react-components';
+
+import { useTranslation } from '../translate';
+import Row from './Row';
+
+interface Props {
+  slashes: [BN, UnappliedSlash[]][];
+}
+
+function Slashes ({ slashes }: Props): React.ReactElement<Props> | null {
+  const { t } = useTranslation();
+  const header = useMemo(() => [
+    [t('unapplied slashes'), 'start', 2],
+    [t('own')],
+    [t('total')],
+    [t('nominators'), 'start'],
+    [t('reporters'), 'start'],
+    [t('payout')]
+  ], [t]);
+  const rows = useMemo((): Slash[] => {
+    return slashes
+      .reduce((rows: Slash[], [era, slashes]): Slash[] => {
+        return slashes.reduce((rows: Slash[], slash): Slash[] => {
+          const total = slash.others.reduce((total: BN, [, value]): BN => {
+            return total.add(value);
+          }, slash.own);
+
+          rows.push({ era, slash, total });
+
+          return rows;
+        }, rows);
+      }, [])
+      .sort((a, b) => b.era.cmp(a.era));
+  }, [slashes]);
+
+  return (
+    <Table
+      empty={t<string>('There an no unapplied/pending slashes')}
+      header={header}
+    >
+      {rows.map((slash, index): React.ReactNode => (
+        <Row
+          key={`${index}-${slash.era.toString()}`}
+          slash={slash}
+          withEra={index === 0 || !slash.era.eq(rows[index - 1].era)}
+        />
+      ))}
+    </Table>
+  );
+}
+
+export default React.memo(Slashes);
diff --git a/packages/page-staking/src/Slashes/types.ts b/packages/page-staking/src/Slashes/types.ts
new file mode 100644
index 0000000000..28734d1878
--- /dev/null
+++ b/packages/page-staking/src/Slashes/types.ts
@@ -0,0 +1,13 @@
+// Copyright 2017-2020 @polkadot/app-staking 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 { UnappliedSlash } from '@polkadot/types/interfaces';
+
+import BN from 'bn.js';
+
+export interface Slash {
+  era: BN;
+  slash: UnappliedSlash;
+  total: BN;
+}
diff --git a/packages/page-staking/src/index.tsx b/packages/page-staking/src/index.tsx
index be1c35064c..afe16cfda1 100644
--- a/packages/page-staking/src/index.tsx
+++ b/packages/page-staking/src/index.tsx
@@ -12,7 +12,7 @@ import { useLocation } from 'react-router-dom';
 import styled from 'styled-components';
 import { HelpOverlay } from '@polkadot/react-components';
 import Tabs from '@polkadot/react-components/Tabs';
-import { useAccounts, useApi, useCall, useFavorites, useOwnStashInfos, useStashIds } from '@polkadot/react-hooks';
+import { useAccounts, useApi, useAvailableSlashes, useCall, useFavorites, useOwnStashInfos, useStashIds } from '@polkadot/react-hooks';
 import { isFunction } from '@polkadot/util';
 
 import basicMd from './md/basic.md';
@@ -21,6 +21,7 @@ import Overview from './Overview';
 import Payouts from './Payouts';
 import Query from './Query';
 import Summary from './Overview/Summary';
+import Slashes from './Slashes';
 import Targets from './Targets';
 import { STORE_FAVS_BASE } from './constants';
 import { useTranslation } from './translate';
@@ -40,6 +41,7 @@ function StakingApp ({ basePath, className = '' }: Props): React.ReactElement<Pr
   const [favorites, toggleFavorite] = useFavorites(STORE_FAVS_BASE);
   const allStashes = useStashIds();
   const ownStashes = useOwnStashInfos();
+  const slashes = useAvailableSlashes();
   const targets = useSortedTargets(favorites);
   const stakingOverview = useCall<DeriveStakingOverview>(api.derive.staking.overview, []);
   const isInElection = useCall<boolean>(api.query.staking?.eraElectionStatus, [], {
@@ -74,6 +76,10 @@ function StakingApp ({ basePath, className = '' }: Props): React.ReactElement<Pr
       name: 'waiting',
       text: t<string>('Waiting')
     },
+    {
+      name: 'slashes',
+      text: t<string>('Slashes')
+    },
     {
       hasParams: true,
       name: 'query',
@@ -81,13 +87,18 @@ function StakingApp ({ basePath, className = '' }: Props): React.ReactElement<Pr
     }
   ].filter((q): q is { name: string; text: string } => !!q), [api, t]);
   const hiddenTabs = useMemo(
-    (): string[] =>
-      !hasAccounts
+    (): string[] => {
+      const base = !hasAccounts
         ? ['actions', 'payouts', 'query']
         : !hasQueries
           ? ['returns', 'query']
-          : [],
-    [hasAccounts, hasQueries]
+          : [];
+
+      return slashes.length
+        ? base
+        : base.concat('slashes');
+    },
+    [hasAccounts, hasQueries, slashes]
   );
 
   useEffect((): void => {
@@ -120,6 +131,9 @@ function StakingApp ({ basePath, className = '' }: Props): React.ReactElement<Pr
         <Route path={[`${basePath}/query/:value`, `${basePath}/query`]}>
           <Query />
         </Route>
+        <Route path={`${basePath}/slashes`}>
+          <Slashes slashes={slashes} />
+        </Route>
         <Route path={`${basePath}/targets`}>
           <Targets
             isInElection={isInElection}