Fix matplotlib dir and add httpx to requirements

app.py

@@ -1,5 +1,4 @@
 import os
-
 os.environ["HF_HOME"] = "/tmp/huggingface"
 os.environ["MPLCONFIGDIR"] = "/tmp/mplconfig"
 os.environ["HF_HOME"] = "/tmp"
@@ -26,6 +25,19 @@ import random
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)
 
+# Coin symbol to CoinGecko ID mapping
+SYMBOL_TO_ID = {
+    "btc": "bitcoin",
+    "eth": "ethereum",
+    "xrp": "ripple",
+    "ltc": "litecoin",
+    "ada": "cardano",
+    "doge": "dogecoin",
+    "sol": "solana",
+    # Add more if needed
+}
+
+
 # FastAPI app
 app = FastAPI()
 
@@ -88,7 +100,8 @@ def analyze_ner(req: TextRequest):
 
 @app.post("/chart")
 def generate_chart(req: CoinRequest):
-    coin_id = req.coin_id.strip().lower()
+    coin_symbol = req.coin_id.strip().lower()
+    coin_id = SYMBOL_TO_ID.get(coin_symbol, coin_symbol)
     logger.info(f"Generating chart for coin: {coin_id}")
     try:
         url = f"https://api.coingecko.com/api/v3/coins/{coin_id}/market_chart"
@@ -125,7 +138,8 @@ def generate_news_image(topic: str) -> str:
     return file_path
 
 # ✅ Chart image generator for visual endpoint (reuse)
-def generate_chart_image(coin_id: str) -> str:
+def generate_chart_image(coin_symbol: str) -> str:
+    coin_id = SYMBOL_TO_ID.get(coin_symbol.lower(), coin_symbol.lower())
     try:
         url = f"https://api.coingecko.com/api/v3/coins/{coin_id}/market_chart"
         params = {"vs_currency": "usd", "days": "7"}