feat(fitness): add AI Smart Macro Logger using Gemini API

package-lock.json

@@ -8,6 +8,7 @@
       "name": "antigravity-app",
       "version": "0.1.0",
       "dependencies": {
+        "@google/generative-ai": "^0.24.1",
         "clsx": "^2.1.1",
         "framer-motion": "^12.35.0",
         "lucide-react": "^0.577.0",
@@ -459,6 +460,15 @@
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
     },
+    "node_modules/@google/generative-ai": {
+      "version": "0.24.1",
+      "resolved": "https://registry.npmjs.org/@google/generative-ai/-/generative-ai-0.24.1.tgz",
+      "integrity": "sha512-MqO+MLfM6kjxcKoy0p1wRzG3b4ZZXtPI+z2IE26UogS2Cm/XHO+7gGRBh6gcJsOiIVoH93UwKvW4HdgiOZCy9Q==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/@humanfs/core": {
       "version": "0.19.1",
       "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.1.tgz",

package.json

@@ -9,6 +9,7 @@
     "lint": "eslint"
   },
   "dependencies": {
+    "@google/generative-ai": "^0.24.1",
     "clsx": "^2.1.1",
     "framer-motion": "^12.35.0",
     "lucide-react": "^0.577.0",

src/app/api/analyze-meal/route.ts

@@ -0,0 +1,86 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { GoogleGenerativeAI } from '@google/generative-ai';
+
+export async function POST(req: NextRequest) {
+  try {
+    const { mealDescription } = await req.json();
+
+    if (!mealDescription || typeof mealDescription !== 'string' || !mealDescription.trim()) {
+      return NextResponse.json(
+        { success: false, error: 'Please provide a valid meal description.' },
+        { status: 400 }
+      );
+    }
+
+    const apiKey = process.env.GEMINI_API_KEY;
+    if (!apiKey) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: 'GEMINI_API_KEY is not configured in .env.local on the server.',
+        },
+        { status: 500 }
+      );
+    }
+
+    const genAI = new GoogleGenerativeAI(apiKey);
+    
+    // Use gemini-1.5-flash with structured JSON response
+    const model = genAI.getGenerativeModel({
+      model: 'gemini-1.5-flash',
+      generationConfig: {
+        responseMimeType: 'application/json',
+        temperature: 0.2,
+      },
+    });
+
+    const prompt = `You are an expert clinical sports nutritionist and dietitian specializing in evidence-based macronutrient tracking.
+Analyze the following meal description and accurately estimate the macronutrients and total energy intake.
+
+Meal description:
+"${mealDescription.trim()}"
+
+Return ONLY a valid JSON object matching this schema:
+{
+  "mealName": "Short descriptive title of the meal",
+  "calories": number (integer total kcal),
+  "protein": number (integer grams of protein),
+  "carbs": number (integer grams of carbohydrates),
+  "fats": number (integer grams of total fat),
+  "items": [
+    {
+      "name": "Food item name and portion",
+      "calories": number,
+      "protein": number,
+      "carbs": number,
+      "fats": number
+    }
+  ],
+  "insight": "One concise sentence on the nutritional value or timing (e.g., 'Excellent post-workout ratio providing >3g leucine for MPS stimulus.')"
+}`;
+
+    const result = await model.generateContent(prompt);
+    const responseText = result.response.text();
+    const data = JSON.parse(responseText);
+
+    return NextResponse.json({
+      success: true,
+      data: {
+        mealName: data.mealName || 'Logged Meal',
+        calories: Math.round(Number(data.calories) || 0),
+        protein: Math.round(Number(data.protein) || 0),
+        carbs: Math.round(Number(data.carbs) || 0),
+        fats: Math.round(Number(data.fats) || 0),
+        items: Array.isArray(data.items) ? data.items : [],
+        insight: data.insight || 'Meal analyzed successfully.',
+      },
+    });
+  } catch (error: unknown) {
+    console.error('Error analyzing meal with Gemini:', error);
+    const message = error instanceof Error ? error.message : 'Failed to analyze meal';
+    return NextResponse.json(
+      { success: false, error: message },
+      { status: 500 }
+    );
+  }
+}

src/components/modules/FitnessView.tsx

@@ -19,7 +19,9 @@ import {
   TrendingUp,
   Target,
   Utensils,
-  Check
+  Check,
+  Loader2,
+  Bot
 } from 'lucide-react';
 import { WorkoutSession, DailyNutrition, MuscleRecovery, WorkoutExercise } from '@/lib/types';
 import { SCIENCE_TIPS, getFormattedDate } from '@/lib/initialData';
@@ -95,6 +97,68 @@ export const FitnessView: React.FC<FitnessViewProps> = ({
     setTimeout(() => setIsSynced(false), 2500);
   };
 
+  // AI Smart Macro Logger State
+  const [mealInput, setMealInput] = useState('');
+  const [isAnalyzing, setIsAnalyzing] = useState(false);
+  const [aiError, setAiError] = useState<string | null>(null);
+  const [lastAnalyzedMeal, setLastAnalyzedMeal] = useState<{
+    mealName: string;
+    calories: number;
+    protein: number;
+    carbs: number;
+    fats: number;
+    items?: { name: string; calories: number; protein: number; carbs: number; fats: number }[];
+    insight?: string;
+  } | null>(null);
+
+  const sampleMealChips = [
+    '3 boiled eggs, 2 rotis with dal, 1 scoop whey',
+    '200g grilled chicken, 1 cup brown rice & broccoli',
+    '1 scoop whey isolate with 250ml milk & 1 banana',
+    '1 cup rolled oats, 1 tbsp peanut butter & Greek yogurt',
+    'Paneer bhurji (150g) with 2 multigrain rotis'
+  ];
+
+  const handleAnalyzeMeal = async (customPrompt?: string) => {
+    const promptToUse = customPrompt || mealInput;
+    if (!promptToUse.trim() || isAnalyzing) return;
+
+    setIsAnalyzing(true);
+    setAiError(null);
+
+    try {
+      const res = await fetch('/api/analyze-meal', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ mealDescription: promptToUse.trim() }),
+      });
+
+      const json = await res.json();
+      if (!res.ok || !json.success) {
+        throw new Error(json.error || 'Failed to analyze meal.');
+      }
+
+      const meal = json.data;
+      setLastAnalyzedMeal(meal);
+
+      // Auto-fill calculated macros directly into the macro tracker!
+      onUpdateNutrition({
+        calories: Math.max(0, nutrition.calories + meal.calories),
+        protein: Math.max(0, nutrition.protein + meal.protein),
+        carbs: Math.max(0, nutrition.carbs + meal.carbs),
+        fats: Math.max(0, nutrition.fats + meal.fats),
+      });
+
+      setMealInput('');
+      playNotificationChime('streak');
+    } catch (err: unknown) {
+      console.error('AI meal analyze error:', err);
+      setAiError(err instanceof Error ? err.message : 'Error analyzing meal. Check API key or network.');
+    } finally {
+      setIsAnalyzing(false);
+    }
+  };
+
   // Log Workout Form State
   const [workoutName, setWorkoutName] = useState('Push Hypertrophy');
   const [workoutDate, setWorkoutDate] = useState(getFormattedDate(0));
@@ -244,6 +308,168 @@ export const FitnessView: React.FC<FitnessViewProps> = ({
           <span className="text-xs text-slate-400">Bodyweight: <strong className="text-white">{nutrition.bodyweightKg} kg</strong></span>
         </div>
 
+        {/* AI SMART MEAL INTAKE CARD */}
+        <div className="glass-card p-5 sm:p-6 border border-lime-500/30 bg-gradient-to-br from-[#0c1a17]/90 via-[#0d1424]/90 to-[#120f26]/90 relative overflow-hidden shadow-2xl space-y-4">
+          <div className="absolute top-0 right-0 w-80 h-80 bg-lime-500/5 rounded-full blur-3xl pointer-events-none" />
+          <div className="absolute bottom-0 left-0 w-80 h-80 bg-purple-500/5 rounded-full blur-3xl pointer-events-none" />
+
+          {/* Card Header */}
+          <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-2 relative z-10">
+            <div className="flex items-center gap-2.5">
+              <div className="p-2 rounded-xl bg-gradient-to-tr from-lime-500/20 to-emerald-500/20 border border-lime-500/40 text-lime-400">
+                <Bot className="w-5 h-5" />
+              </div>
+              <div>
+                <h4 className="text-sm sm:text-base font-bold text-white flex items-center gap-2">
+                  <span>AI Smart Meal Intake Logger</span>
+                  <span className="text-[10px] font-extrabold uppercase px-2 py-0.5 rounded-full bg-lime-500/10 text-lime-400 border border-lime-500/30">
+                    Gemini AI
+                  </span>
+                </h4>
+                <p className="text-xs text-slate-400">
+                  Describe what you ate in natural language—AI calculates the macros and updates your tracker automatically.
+                </p>
+              </div>
+            </div>
+          </div>
+
+          {/* Meal Input and Submit Action */}
+          <form
+            onSubmit={(e) => {
+              e.preventDefault();
+              handleAnalyzeMeal();
+            }}
+            className="space-y-3 relative z-10"
+          >
+            <div className="flex flex-col sm:flex-row gap-2.5">
+              <input
+                type="text"
+                value={mealInput}
+                onChange={(e) => setMealInput(e.target.value)}
+                disabled={isAnalyzing}
+                placeholder="e.g. 3 boiled eggs, 2 rotis with dal, 1 scoop whey protein"
+                className="flex-1 px-4 py-3 rounded-xl bg-slate-950/80 border border-slate-800 text-sm text-slate-100 placeholder-slate-500 focus:outline-none focus:border-lime-500 transition-colors disabled:opacity-50"
+              />
+              <button
+                type="submit"
+                disabled={isAnalyzing || !mealInput.trim()}
+                className="px-6 py-3 rounded-xl bg-gradient-to-r from-lime-500 via-emerald-500 to-teal-500 text-slate-950 font-bold text-xs shadow-lg shadow-lime-500/20 hover:scale-102 active:scale-98 transition-all disabled:opacity-40 disabled:hover:scale-100 disabled:cursor-not-allowed cursor-pointer flex items-center justify-center gap-2 shrink-0"
+              >
+                {isAnalyzing ? (
+                  <>
+                    <Loader2 className="w-4 h-4 animate-spin" />
+                    <span>Analyzing with AI...</span>
+                  </>
+                ) : (
+                  <>
+                    <Sparkles className="w-4 h-4" />
+                    <span>Analyze Meal with AI</span>
+                  </>
+                )}
+              </button>
+            </div>
+
+            {/* Sample Prompt Chips */}
+            <div className="flex flex-wrap items-center gap-1.5 pt-1">
+              <span className="text-[11px] font-semibold text-slate-400 flex items-center gap-1 mr-1">
+                <Sparkles className="w-3 h-3 text-lime-400" />
+                Quick ideas:
+              </span>
+              {sampleMealChips.map((chip, idx) => (
+                <button
+                  key={idx}
+                  type="button"
+                  disabled={isAnalyzing}
+                  onClick={() => {
+                    setMealInput(chip);
+                    handleAnalyzeMeal(chip);
+                  }}
+                  className="text-[11px] px-2.5 py-1 rounded-lg bg-slate-900/80 hover:bg-slate-800 border border-slate-800 hover:border-lime-500/40 text-slate-300 hover:text-lime-300 transition-all cursor-pointer text-left truncate max-w-xs sm:max-w-none disabled:opacity-40"
+                >
+                  {chip}
+                </button>
+              ))}
+            </div>
+          </form>
+
+          {/* Error Banner */}
+          {aiError && (
+            <div className="p-3 rounded-xl bg-red-950/30 border border-red-500/40 text-xs text-red-300 flex items-center justify-between">
+              <span>⚠️ {aiError}</span>
+              <button
+                onClick={() => setAiError(null)}
+                className="text-red-400 hover:text-red-200 text-xs font-bold ml-2 cursor-pointer"
+              >
+                Dismiss
+              </button>
+            </div>
+          )}
+
+          {/* Last Analyzed Meal Results Card */}
+          {lastAnalyzedMeal && (
+            <div className="p-4 rounded-xl bg-lime-950/20 border border-lime-500/40 space-y-3 animate-in fade-in duration-300 relative z-10">
+              <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-2 border-b border-lime-500/20 pb-2.5">
+                <div className="flex items-center gap-2">
+                  <CheckCircle2 className="w-4 h-4 text-lime-400" />
+                  <span className="text-xs font-bold text-white uppercase tracking-wider">
+                    {lastAnalyzedMeal.mealName}
+                  </span>
+                </div>
+                <span className="text-[11px] font-semibold text-emerald-400 bg-emerald-500/10 px-2 py-0.5 rounded-full border border-emerald-500/30">
+                  ✓ Auto-filled to Today&apos;s Intake
+                </span>
+              </div>
+
+              {/* Added Macro Badges */}
+              <div className="grid grid-cols-2 sm:grid-cols-4 gap-2">
+                <div className="p-2 rounded-lg bg-slate-900/90 border border-lime-500/30 text-center">
+                  <span className="text-[10px] font-bold text-slate-400 uppercase block">Calories</span>
+                  <span className="text-lg font-black text-lime-400 font-mono">+{lastAnalyzedMeal.calories}</span>
+                  <span className="text-[10px] text-slate-500 block">kcal</span>
+                </div>
+                <div className="p-2 rounded-lg bg-slate-900/90 border border-cyan-500/30 text-center">
+                  <span className="text-[10px] font-bold text-slate-400 uppercase block">Protein</span>
+                  <span className="text-lg font-black text-cyan-400 font-mono">+{lastAnalyzedMeal.protein}g</span>
+                  <span className="text-[10px] text-slate-500 block">Leucine rich</span>
+                </div>
+                <div className="p-2 rounded-lg bg-slate-900/90 border border-amber-500/30 text-center">
+                  <span className="text-[10px] font-bold text-slate-400 uppercase block">Carbohydrates</span>
+                  <span className="text-lg font-black text-amber-400 font-mono">+{lastAnalyzedMeal.carbs}g</span>
+                  <span className="text-[10px] text-slate-500 block">Glycogen fuel</span>
+                </div>
+                <div className="p-2 rounded-lg bg-slate-900/90 border border-orange-500/30 text-center">
+                  <span className="text-[10px] font-bold text-slate-400 uppercase block">Healthy Fats</span>
+                  <span className="text-lg font-black text-orange-400 font-mono">+{lastAnalyzedMeal.fats}g</span>
+                  <span className="text-[10px] text-slate-500 block">Hormone balance</span>
+                </div>
+              </div>
+
+              {/* Items Breakdown & Scientific Insight */}
+              {lastAnalyzedMeal.insight && (
+                <p className="text-xs text-lime-300/90 bg-slate-950/40 p-2.5 rounded-lg border border-lime-500/20 italic">
+                  💡 {lastAnalyzedMeal.insight}
+                </p>
+              )}
+
+              {lastAnalyzedMeal.items && lastAnalyzedMeal.items.length > 0 && (
+                <div className="pt-1">
+                  <span className="text-[10px] font-bold text-slate-400 uppercase tracking-wider block mb-1">
+                    Itemized Portion Estimates
+                  </span>
+                  <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-1.5">
+                    {lastAnalyzedMeal.items.map((it, i) => (
+                      <div key={i} className="text-[11px] p-1.5 px-2 rounded bg-slate-900/60 border border-slate-800 text-slate-300 flex items-center justify-between">
+                        <span className="truncate pr-2 font-medium">{it.name}</span>
+                        <span className="text-slate-400 shrink-0 font-mono">{it.calories} kcal ({it.protein}g P)</span>
+                      </div>
+                    ))}
+                  </div>
+                </div>
+              )}
+            </div>
+          )}
+        </div>
+
         <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
           {/* Calories Card */}
           <div className="glass-card p-5 border-l-4 border-l-lime-500">