feat(meal-planner): add auto-generate meal plan functionality

Add new utility function to generate daily meal plans based on user's calorie targets and food categories. Include auto-generate button in meal planner UI with confirmation prompt. Add new Filipino food items to seed data for better meal variety. Fix database column references to use capitalized field names consistently.

utils/index.js

@@ -65,7 +65,7 @@ async function calculateDailyTotals(userId, targetDate = null) {
   // Get all meals for the date
   const meals = await db.Meal.findAll({
     where: {
-      user_id: userId,
+      UserId: userId,
       date: dateStr
     },
     include: [{
@@ -142,7 +142,7 @@ async function calculateWaterTotal(userId, targetDate = null) {
   
   const waterLogs = await db.WaterLog.findAll({
     where: {
-      user_id: userId,
+      UserId: userId,
       date: dateStr
     }
   });
@@ -170,7 +170,7 @@ async function getWeightTrend(userId, days = 7) {
   
   const weightLogs = await db.WeightLog.findAll({
     where: {
-      user_id: userId,
+      UserId: userId,
       date: {
         [Op.between]: [startDateStr, endDateStr]
       }
@@ -226,7 +226,7 @@ async function updateDailySummary(userId, targetDate = null) {
   // Get weight for the day
   const weightLog = await db.WeightLog.findOne({
     where: {
-      user_id: userId,
+      UserId: userId,
       date: dateStr
     }
   });
@@ -239,14 +239,14 @@ async function updateDailySummary(userId, targetDate = null) {
   // Find or create summary
   let summary = await db.DailySummary.findOne({
     where: {
-      user_id: userId,
+      UserId: userId,
       date: dateStr
     }
   });
   
   if (!summary) {
     summary = await db.DailySummary.create({
-      user_id: userId,
+      UserId: userId,
       date: dateStr
     });
   }
@@ -326,6 +326,125 @@ function suggestFoodsForMacros(remainingProtein, remainingCarbs, remainingFat) {
   return suggestions;
 }
 
+async function generateDailyMealPlan(userId, dateStr) {
+  try {
+    // Get user's calorie target
+    const user = await db.User.findByPk(userId);
+    const targetCalories = user ? user.target_daily_calories : 2000;
+    
+    // Distribution: Breakfast 25%, Lunch 35%, Dinner 30%, Snack 10%
+    const targets = {
+      breakfast: Math.round(targetCalories * 0.25),
+      lunch: Math.round(targetCalories * 0.35),
+      dinner: Math.round(targetCalories * 0.30),
+      snack: Math.round(targetCalories * 0.10)
+    };
+    
+    // Fetch all foods
+    const foods = await db.FoodItem.findAll();
+    
+    // Categorize foods
+    const foodByCat = {
+      almusal: foods.filter(f => f.category === 'almusal'),
+      ulam: foods.filter(f => ['ulam', 'sabaw'].includes(f.category)),
+      kanin: foods.filter(f => f.category === 'kanin'),
+      gulay: foods.filter(f => f.category === 'gulay'),
+      meryenda: foods.filter(f => f.category === 'meryenda')
+    };
+    
+    // Fallback if categories are empty (use all foods)
+    const allFoods = foods;
+    
+    // Helper to pick random item
+    const pickRandom = (arr) => arr.length > 0 ? arr[Math.floor(Math.random() * arr.length)] : null;
+    
+    // Helper to generate a meal
+    const generateMeal = async (mealType, targetCal) => {
+      let currentCal = 0;
+      const selectedFoods = [];
+      
+      // Strategy per meal type
+      if (mealType === 'breakfast') {
+        // Try almusal first
+        const main = pickRandom(foodByCat.almusal) || pickRandom(allFoods);
+        if (main) {
+          selectedFoods.push({ food: main, qty: 1 });
+          currentCal += main.calories;
+        }
+      } else if (['lunch', 'dinner'].includes(mealType)) {
+        // Rice + Ulam + (maybe) Gulay
+        const rice = pickRandom(foodByCat.kanin);
+        const ulam = pickRandom(foodByCat.ulam) || pickRandom(allFoods);
+        const gulay = pickRandom(foodByCat.gulay);
+        
+        if (rice) {
+          selectedFoods.push({ food: rice, qty: 1 });
+          currentCal += rice.calories;
+        }
+        if (ulam) {
+          selectedFoods.push({ food: ulam, qty: 1 });
+          currentCal += ulam.calories;
+        }
+        // Add vegetable if we have room
+        if (gulay && currentCal < targetCal) {
+           selectedFoods.push({ food: gulay, qty: 1 });
+           currentCal += gulay.calories;
+        }
+      } else if (mealType === 'snack') {
+        const snack = pickRandom(foodByCat.meryenda) || pickRandom(allFoods);
+        if (snack) {
+          selectedFoods.push({ food: snack, qty: 1 });
+          currentCal += snack.calories;
+        }
+      }
+      
+      // Adjust quantities to closer match target (simple scaling)
+      if (currentCal > 0 && selectedFoods.length > 0) {
+        const ratio = targetCal / currentCal;
+        // Limit scaling to reasonable bounds (0.5x to 2.0x) to avoid weird portions
+        // But for simplicity, let's just create the plan as is, maybe adding another item if way under
+        
+        // Create MealPlan
+        const mealPlan = await db.MealPlan.create({
+          UserId: userId,
+          date: dateStr,
+          meal_type: mealType,
+          is_completed: false
+        });
+        
+        // Add foods
+        for (const item of selectedFoods) {
+          await db.PlannedFood.create({
+            MealPlanId: mealPlan.id,
+            FoodItemId: item.food.id,
+            quantity: item.qty
+          });
+        }
+      }
+    };
+    
+    // Delete existing plans for this date? Or just append?
+    // Let's clear existing plans for this date to avoid duplicates if re-generating
+    await db.MealPlan.destroy({
+      where: {
+        UserId: userId,
+        date: dateStr
+      }
+    });
+    
+    // Generate for each meal type
+    await generateMeal('breakfast', targets.breakfast);
+    await generateMeal('lunch', targets.lunch);
+    await generateMeal('dinner', targets.dinner);
+    await generateMeal('snack', targets.snack);
+    
+    return true;
+  } catch (error) {
+    console.error('Error generating meal plan:', error);
+    throw error;
+  }
+}
+
 module.exports = {
   calculateBMR,
   calculateTDEE,
@@ -336,5 +455,6 @@ module.exports = {
   getCalorieTrend,
   updateDailySummary,
   getMacroPercentages,
-  suggestFoodsForMacros
+  suggestFoodsForMacros,
+  generateDailyMealPlan
 };