From 273f2d7bf85fb67d49b119473ee7dd1bca348026 Mon Sep 17 00:00:00 2001
From: meetdhorajiya <meetdhorajiya415@gmail.com>
Date: Sun, 19 Oct 2025 21:54:10 +0530
Subject: [PATCH] feat: Add 24h profit/loss calculator modal

---
 src/components/CryptoCalculatorModal.jsx | 157 +++++++++++++++++++++++
 src/pages/Crypto.jsx                     |  28 +++-
 src/styles.css                           | 134 +++++++++++++++++++
 3 files changed, 318 insertions(+), 1 deletion(-)
 create mode 100644 src/components/CryptoCalculatorModal.jsx

diff --git a/src/components/CryptoCalculatorModal.jsx b/src/components/CryptoCalculatorModal.jsx
new file mode 100644
index 0000000..57ba024
--- /dev/null
+++ b/src/components/CryptoCalculatorModal.jsx
@@ -0,0 +1,157 @@
+import React, { useState, useEffect, useRef } from 'react';
+
+export default function CryptoCalculatorModal({ coinData, onClose }) {
+  const [amount, setAmount] = useState('');
+  const [selectedCoinId, setSelectedCoinId] = useState(coinData[0]?.id || '');
+
+  const [searchTerm, setSearchTerm] = useState('');
+  const [isDropdownOpen, setIsDropdownOpen] = useState(false);
+  const dropdownRef = useRef(null);
+
+  const [result, setResult] = useState(null);
+
+  useEffect(() => {
+    setResult(null);
+  }, [amount, selectedCoinId]);
+
+  useEffect(() => {
+    function handleClickOutside(event) {
+      if (dropdownRef.current && !dropdownRef.current.contains(event.target)) {
+        setIsDropdownOpen(false);
+      }
+    }
+    document.addEventListener("mousedown", handleClickOutside);
+    return () => {
+      document.removeEventListener("mousedown", handleClickOutside);
+    };
+  }, [dropdownRef]);
+
+
+  const isButtonDisabled = !amount || parseFloat(amount) <= 0;
+
+  const handleCalculate = () => {
+    const coin = coinData.find((c) => c.id === selectedCoinId);
+    const inputAmount = parseFloat(amount);
+    if (!coin) return;
+
+    const changePercent = coin.price_change_percentage_24h;
+    const changeDecimal = changePercent / 100;
+    const profitOrLoss = inputAmount * changeDecimal;
+    const finalAmount = inputAmount + profitOrLoss;
+
+    setResult({
+      finalAmount: finalAmount.toFixed(2),
+      profitOrLoss: profitOrLoss.toFixed(2),
+      isProfit: profitOrLoss >= 0,
+      error: null,
+    });
+  };
+
+  const filteredCoins = coinData.filter(coin =>
+    coin.name.toLowerCase().includes(searchTerm.toLowerCase()) ||
+    coin.symbol.toLowerCase().includes(searchTerm.toLowerCase())
+  );
+
+  const selectedCoin = coinData.find(c => c.id === selectedCoinId);
+
+  return (
+    <div className="modal-overlay" onClick={onClose}>
+      <div className="modal" onClick={(e) => e.stopPropagation()}>
+        <button className="modal-close-button" onClick={onClose}>
+          &times;
+        </button>
+        <h2>24h Profit/Loss Calculator</h2>
+
+        <div className="modal-input-group">
+          <label htmlFor="amount">Amount (USD)</label>
+          <input
+            id="amount"
+            type="number"
+            min="0"
+            value={amount}
+            onChange={(e) => setAmount(e.target.value)}
+            placeholder="e.g., 100"
+            className="modal-input"
+          />
+        </div>
+
+        <div className="modal-input-group">
+          <label htmlFor="crypto-search">Cryptocurrency</label>
+          <div className="modal-dropdown-container" ref={dropdownRef}>
+            <input
+              id="crypto-search"
+              type="text"
+              className="modal-input"
+              value={isDropdownOpen ? searchTerm : (selectedCoin?.name || '')}
+              onChange={(e) => {
+                setSearchTerm(e.target.value);
+                setIsDropdownOpen(true);
+              }}
+              onFocus={() => setIsDropdownOpen(true)}
+              placeholder="Search coin..."
+            />
+            {isDropdownOpen && (
+              <div className="modal-dropdown-list">
+                {filteredCoins.length > 0 ? (
+                  filteredCoins.map((coin) => (
+                    <div
+                      key={coin.id}
+                      className="modal-dropdown-item"
+                      onClick={() => {
+                        setSelectedCoinId(coin.id);
+                        setSearchTerm('');
+                        setIsDropdownOpen(false);
+                      }}
+                    >
+                      <img src={coin.image} alt={coin.symbol} style={{ width: 20, height: 20 }}/>
+                      {coin.name} ({coin.symbol.toUpperCase()})
+                    </div>
+                  ))
+                ) : (
+                  <div className="modal-dropdown-item-none">
+                    No results found
+                  </div>
+                )}
+              </div>
+            )}
+          </div>
+        </div>
+
+        <button
+          onClick={handleCalculate}
+          className="modal-button" 
+          disabled={isButtonDisabled} 
+        >
+          Calculate
+        </button>
+
+        {result && (
+          <div className="modal-result">
+            {result.error ? (
+              <p style={{ color: 'var(--danger)' }}>{result.error}</p>
+            ) : (
+              <>
+                <p>Your ${amount} invested 24h ago would now be worth:</p>
+                <h3
+                  style={{
+                    color: result.isProfit ? '#16a34a' : 'var(--danger)',
+                    fontSize: '1.5rem',
+                    margin: '0.5rem 0',
+                  }}
+                >
+                  ${result.finalAmount}
+                </h3>
+                <p>
+                  A {result.isProfit ? 'profit' : 'loss'} of{' '}
+                  <strong>
+                    {result.isProfit ? '+' : ''}${result.profitOrLoss}
+                  </strong>
+                </p>
+              </>
+            )}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
diff --git a/src/pages/Crypto.jsx b/src/pages/Crypto.jsx
index 3d659e7..0781f34 100644
--- a/src/pages/Crypto.jsx
+++ b/src/pages/Crypto.jsx
@@ -26,7 +26,7 @@ import Card from "../components/Card.jsx";
 import formatNumber from "../utilities/numberFormatter.js";
 import HeroSection from '../components/HeroSection';
 import CryptoImg from '../Images/Cryptocurrency.jpg';
-
+import CryptoCalculatorModal from "../components/CryptoCalculatorModal.jsx";
 
 export default function Crypto() {
   const [coins, setCoins] = useState([]);
@@ -34,6 +34,7 @@ export default function Crypto() {
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState(null);
   const [page, setPage] = useState(1);
+  const [isCalculatorOpen, setIsCalculatorOpen] = useState(false);
 
   useEffect(() => {
     fetchCoins();
@@ -79,6 +80,23 @@ export default function Crypto() {
         style={{ marginBottom: "1rem" }}
       />
 
+      <div style={{ display: 'flex', gap: '1rem', marginBottom: '1rem', alignItems: 'center' }}>
+        <button
+          onClick={() => setIsCalculatorOpen(true)}
+          style={{
+            padding: '0.5rem 1rem',
+            cursor: 'pointer',
+            backgroundColor: '#007bff',
+            color: 'white',
+            border: 'none',
+            borderRadius: '4px',
+            whiteSpace: 'nowrap'
+          }}
+        >
+          24h Calculator
+        </button>
+      </div>
+
       {loading && <Loading />}
       <ErrorMessage error={error} />
 
@@ -134,6 +152,14 @@ export default function Crypto() {
 
         <button onClick={() => setPage((p) => p + 1)}>Next</button>
       </div>
+
+        {isCalculatorOpen && coins.length > 0 && (
+          <CryptoCalculatorModal
+            coinData={coins}
+            onClose={() => setIsCalculatorOpen(false)}
+          />
+        )}
+        
     </div>
   );
 }
diff --git a/src/styles.css b/src/styles.css
index e395cd2..751b1c4 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -922,4 +922,138 @@ blockquote {
   }
 }
 
+.modal-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background-color: rgba(0, 0, 0, 0.7);
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  z-index: 1000;
+  animation: fadeIn 0.2s ease-out;
+}
+
+@keyframes fadeIn {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
+}
+
+.modal {
+  background-color: var(--bg);
+  color: var(--text);
+  padding: 2rem;
+  border-radius: var(--radius);
+  width: 90%;
+  max-width: 500px;
+  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
+  position: relative;
+  animation: modalSlideIn 0.3s ease-out;
+}
+
+@keyframes modalSlideIn {
+  from {
+    opacity: 0;
+    transform: translateY(-20px) scale(0.95);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+  }
+}
+
+.modal-close-button {
+  position: absolute;
+  top: 1rem;
+  right: 1rem;
+  background: transparent;
+  border: none;
+  font-size: 1.5rem;
+  cursor: pointer;
+  color: var(--text);
+  opacity: 0.7;
+  transition: opacity 0.2s ease;
+}
+
+.modal-close-button:hover {
+  opacity: 1;
+}
 
+.modal-input-group {
+  margin-bottom: 1rem;
+}
+
+.modal-input-group label {
+  display: block;
+  margin-bottom: 0.5rem;
+  font-weight: bold;
+}
+
+.modal-input {
+  width: 100%;
+  padding: 0.5rem 0.75rem;
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background: var(--bg-alt);
+  color: var(--text);
+  box-sizing: border-box;
+}
+
+.modal-button {
+  width: 100%;
+  padding: 0.75rem;
+  font-size: 1rem;
+}
+
+.modal-result {
+  margin-top: 1.5rem;
+  padding: 1rem;
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background-color: var(--bg-alt);
+  text-align: center;
+}
+
+.modal-dropdown-container {
+  position: relative;
+}
+
+.modal-dropdown-list {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  right: 0;
+  background-color: var(--bg);
+  border: 1px solid var(--border);
+  border-top: none;
+  border-radius: 0 0 var(--radius) var(--radius);
+  max-height: 150px;
+  overflow-y: auto;
+  z-index: 1001;
+  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
+}
+
+.modal-dropdown-item,
+.modal-dropdown-item-none {
+  padding: 0.75rem;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.modal-dropdown-item:hover {
+  background-color: var(--bg-alt);
+}
+
+.modal-dropdown-item-none {
+  font-style: italic;
+  opacity: 0.7;
+  cursor: default;
+}