From 47bd08e7a981aa280197e3dc20f1acc93373571d Mon Sep 17 00:00:00 2001
From: Matthias Kretschmann <m@kretschmann.io>
Date: Wed, 28 Oct 2020 10:32:56 +0100
Subject: [PATCH] create price provider

---
 src/helpers/wrapRootElement.tsx |  3 +-
 src/providers/Prices.tsx        | 70 +++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 src/providers/Prices.tsx

diff --git a/src/helpers/wrapRootElement.tsx b/src/helpers/wrapRootElement.tsx
index e00ebe1c0..b99bbcc49 100644
--- a/src/helpers/wrapRootElement.tsx
+++ b/src/helpers/wrapRootElement.tsx
@@ -9,6 +9,7 @@ import {
   ConfigHelperNetworkId
 } from '@oceanprotocol/lib/dist/node/utils/ConfigHelper'
 import { UserPreferencesProvider } from '../providers/UserPreferences'
+import PricesProvider from '../providers/Prices'
 
 export function getOceanConfig(
   network: ConfigHelperNetworkName | ConfigHelperNetworkId
@@ -34,7 +35,7 @@ export default function wrapRootElement({
     >
       <UserPreferencesProvider>
         <NetworkMonitor />
-        {element}
+        <PricesProvider>{element}</PricesProvider>
       </UserPreferencesProvider>
     </OceanProvider>
   )
diff --git a/src/providers/Prices.tsx b/src/providers/Prices.tsx
new file mode 100644
index 000000000..2fb757cf7
--- /dev/null
+++ b/src/providers/Prices.tsx
@@ -0,0 +1,70 @@
+import React, {
+  useState,
+  useEffect,
+  ReactElement,
+  createContext,
+  useContext,
+  ReactNode
+} from 'react'
+import { fetchData } from '../utils'
+import useSWR from 'swr'
+import { useSiteMetadata } from '../hooks/useSiteMetadata'
+import { Logger } from '@oceanprotocol/lib'
+
+interface PricesValue {
+  prices: {
+    [key: string]: number
+  }
+}
+
+const initialData: PricesValue = {
+  prices: {
+    eur: 0.0,
+    usd: 0.0,
+    eth: 0.0,
+    btc: 0.0
+  }
+}
+
+const PricesContext = createContext(null)
+
+export default function PricesProvider({
+  children
+}: {
+  children: ReactNode
+}): ReactElement {
+  const { appConfig } = useSiteMetadata()
+  const tokenId = 'ocean-protocol'
+  const currencies = appConfig.currencies.join(',') // comma-separated list
+  const url = `https://api.coingecko.com/api/v3/simple/price?ids=${tokenId}&vs_currencies=${currencies}&include_24hr_change=true`
+
+  const [prices, setPrices] = useState(initialData)
+
+  const { data } = useSWR(url, fetchData, {
+    initialData,
+    refreshInterval: 30000, // 30 sec.
+    // eslint-disable-next-line @typescript-eslint/no-use-before-define
+    onSuccess
+  })
+
+  async function onSuccess() {
+    if (!data) return
+    Logger.log(`Got new prices. ${JSON.stringify(data)}`)
+    setPrices(data)
+  }
+
+  useEffect(() => {
+    onSuccess()
+  }, [data])
+
+  return (
+    <PricesContext.Provider value={{ prices }}>
+      {children}
+    </PricesContext.Provider>
+  )
+}
+
+// Helper hook to access the provider values
+const usePrices = (): PricesValue => useContext(PricesContext)
+
+export { PricesProvider, usePrices, PricesValue }