AAprompt - localhost!

1. Install VSCode

2. Use AI features with Copilot for free, Set up Copilot (login to GitHub)

3. Create a folder for your app using explorer in VSCode (such as testapp2, Node.js package names must be all lowercase)

4. Install Node.js (restart VSCode)

5. Open terminal in VSCode

6. VSCode terminal: Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy RemoteSigned

7. npm -v (should now show the version of npm package manager)

8. npm create vite@latest . --template react

8a. Choose react

8b. JavaScript

8c. No experimental option

8d. Install with npm and start now? Yes

9. Test: http://localhost:5173/

10. If you close the terminal the localhost will stop. Start it again with: npm run dev

Ask the Agent in VSCode: "I have a React app created with Vite. What npm command should I use to install Chart.js for candlestick charts?"

npm install react-chartjs-2 chart.js chartjs-chart-financial chartjs-adapter-date-fns date-fns

Ask the Agent:

I have a Vite + React app.

I already installed: react-chartjs-2 chart.js chartjs-chart-financial chartjs-adapter-date-fns date-fns.

Create a new React component called BtcChart that uses react-chartjs-2 to render a simple line chart with fake BTC price data over time. Use a time scale on the X axis and price on the Y axis.

It created BtcChart.jsx and modified App.jsx. Now in http://localhost:5174/ , see the BTC chart below the Vite + React logo.

App.jsx is the “main” component – it’s what React mounts at the root of the page.

Inside App.jsx, you can render as many other components as you want, like:

BtcChart, Sidebar, Header, TradeList etc. Those components are visible in the src folder.

I have a Vite + React app with a BtcChart component.

- Please remove the Vite + React logos and default starter content from App.jsx and keep only my BTC chart and a simple title.

- In BtcChart, stop using any hardcoded fake data. Use only real BTC-USDT candles from KuCoin’s public API (/api/v1/market/candles with symbol BTC-USDT and a timeframe like 4hour). Fetch the data in useEffect, store it in state, and use the close price as the Y value in the line chart.

- Make the chart responsive and make it fill the full width of the page. Vertically, the chart should be about 1/6 of the viewport height (for example, using height: "16vh" on the chart container).

- Do not add fake data as a fallback. If the fetch fails, just show an error message or no data.

6. Localhost: "Error loading BTC data: Failed to fetch"

I see the chart but i get the error : Error loading BTC data: Failed to fetch.

Let's call KuCoin from a backend. For this we might need a server.js file to listen on port 3000

npm install express

npm run server

9. To see the page now we need to have 2 things running in 2 terminals at the same time:

npm run server and npm run dev

10.

Make the chart container take the full width of the page and about 1/6 of the page height.

11.

The size didn't change. Remove that default Vite styling.

12.

“In BtcChart.jsx, please add support for multiple time ranges.

Introduce a React state variable like selectedRange with default '1M'.

Render buttons above the chart: 1D, 1W, 1M, 3M, 6M, 1Y, FULL.

When I click a button, update selectedRange and re-fetch the data.

The fetch should call my backend as http://localhost:3000/api/btc-candles?range=1D or 1W or 1M depending on the selected button.

Use useEffect with selectedRange in the dependency array so that changing the range triggers a new fetch.

Keep the chart and options the same, just add the buttons and the range logic.”

13. Try adjusting the graphics with VSCode Agent:

- Change the BtcChart title size, make it two times smaller

- Make the background of BtcChart component white

- Now the chart area of the BtcChart is white. Change also the Title area and the Timeframe control area to white.

- They are white but the text is also white. Make it black so it becomes visible

- The text of the buttons is still white. Make it black.

- Place the title region on the same line as the button region

- Now make the background of those to regions also white.

14.

If you close VSCode

Later you just reopen the same folder, run npm run server and npm run dev again, and you’re back.

The Agent won’t “remember the conversation”, but it will understand your project by reading the files.

“In BtcChart.jsx, please change the loading behavior:

– Do not return early with Loading BTC data....

– The chart container and chart should always stay visible.

– When loading is true, show a semi-transparent overlay on top of the chart with the text Loading BTC data….

– Use a div wrapper with position: relative around the chart, and an absolutely positioned overlay (position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: rgba(0,0,0,0.4); color: white;).

Please show me the full updated BtcChart component.”

Under the BTC price chart, create a “price range bar” component that uses the current timeframe’s candles.

Use the candles already loaded for the selected timeframe (objects with at least close and t or similar).
Compute:
- lowPrice = minimum close in this timeframe
- highPrice = maximum close in this timeframe
- lastPrice = close of the latest candle
- lastPctChange = percent change between lastPrice and lowPrice
Compute a marker position in percent:
markerPercent = ((lastPrice - lowPrice) / (highPrice - lowPrice)) * 100,
clamp to [0, 100]. If highPrice === lowPrice, use 50.

Render this structure below the chart:

<div className="price-range-wrapper">

</div>

</div>

</div>

Style it so:
- .price-range-wrapper is display:flex, align-items:center, justify-content:center, with a gap between the labels and bar.
- .price-range-bar has flex: 0 0 33% so the bar is 1/3 of the total width.
- .price-range-track is a horizontal grey bar.
- .price-range-marker is an absolutely positioned small black circle, positioned with left: ${markerPercent}%.
- .price-range-highlight is a small purple rectangle right under the marker.
- .price-range-last is the “Last: $… (…%)” text below the bar, centered.

Don’t use <input type="range">. Use pure <div> elements with flexbox and absolute positioning as described.

Add a new square toggle button immediately after the FULL button.
The button must:

be light grey when OFF
be light green when ON
toggle a React state variable called autoFetch (true / false)
when autoFetch is true, the chart must refresh only the current timeframe, using loadCandles(range) every 60 seconds
when autoFetch is false, no interval should run
use a useEffect(() => ..., [autoFetch, range]) with setInterval + clearInterval for the refresh logic
do not store anything in localStorage yet
keep all code inside BtcChart.jsx

Button label can be empty or a small symbol (like “A”).

To ChatGPT:

Now we should implement remembering settings.

When the page is refreshed, inside the BtcChart.jsx component, the timeframe option and the state of the Auto-refresh button shold be remembered.

We must take into account that later we will have several BtcChart.jsx components on different coins or on the same coin, but with different options.

Will this be a problem? how are the settings saved for multiple BtcChart.jsx components ?

Write the instructions for the Agent so it can implement them.

The settings are kept inside the browser, in a built-in storage system called localStorage.

Open DevTools (Ctrl+Shift+I) → Console, and type:

localStorage

Or to see a specific key:

localStorage.getItem("btc_main_range")

localStorage.getItem("btc_main_auto")

To clear it:

localStorage.clear()

Refactor the internal JSX layout of BtcChart.jsx to use clear, semantic sub-component naming.
Do not move code to new files; keep everything inside BtcChart.jsx.
Only improve structure and class naming.

1. Wrap the entire component UI in a root container:

2. Create a header row containing title + controls:

</div>

Place the timeframe buttons inside chart-timeframe-buttons
Place the auto-refresh button inside chart-auto-refresh
Keep both inside chart-controls, which is aligned on the right

3. Wrap the Chart.js canvas in:

{/* <Line ... /> */}

</div>

4. Wrap the Hot–Cold bar in:

{/* Low label + gradient bar + marker + High label */}

</div>

5. Do not rename variables or logic.

Only rename JSX classNames and reorganize the markup structure cleanly to match the layout above.

This naming convention must be used consistently because later we will extract these into separate components.

App.jsx
- Inside: it maps visibleCoins
-list saved in localStorage

CoinContainerComponent.jsx
- Inside: Chart window / border, Control buttons block

CoinStatsComponent

│

├── chart-header

│ ├── chart-title
│ ├── increase-decrease

│ └── chart-timeframe-buttons + auto-refresh

│

├── price-chart-container ← contains ONLY the chart & ticks

│ └── <canvas> (Chart.js renders)

│ ├── line graph

│ ├── Y-axis labels

│ ├── X-axis ticks

│ ├── gridlines

│

└── chart-hot-cold-bar

Now we have APP.jsx containing CoinContainerListScroll.jsx containing CoinContainerComponent.jsx containing CoinStatsComponent.jsx

In App.jsx:

Right: Add new SearchList container on the right side of CoinContainerListScroll.
SearchList shows ~150 coins fetched from KuCoin (sorted by market cap or similar).

Each coin has an Add (+) button on the left side of the coin.

Clicking Add:

Inserts that coin at the top of CoinContainerListScroll
Updates visibleCoins in localStorage.

Created SearchList.jsx:

The SearchList Fails to fetch. Try:

Create a working backend route /api/top-coins in the same Node/Express server that handles /api/candles.

This new route must:

Fetch KuCoin’s public ticker list from https://api.kucoin.com/api/v1/market/allTickers

Filter to USDT trading pairs.

Sort them by 24h volume (volValue).

Return the top ~150 coins as JSON (each with symbol and base name).**

Then update SearchList.jsx so it fetches from /api/top-coins instead of calling KuCoin directly.

Display the returned list and use the existing onAddCoin callback when the (+) button is pressed.

Handle loading and error states normally