feat: Phase 0c - nutrition_metrics.py module complete

Data Layer:
- get_nutrition_average_data() - all macros in one call
- get_nutrition_days_data() - coverage tracking
- get_protein_targets_data() - 1.6g/kg and 2.2g/kg targets
- get_energy_balance_data() - deficit/surplus/maintenance
- get_protein_adequacy_data() - 0-100 score
- get_macro_consistency_data() - 0-100 score

Placeholder Layer:
- get_nutrition_avg() - refactored to use data layer
- get_nutrition_days() - refactored to use data layer
- get_protein_ziel_low() - refactored to use data layer
- get_protein_ziel_high() - refactored to use data layer

All 6 nutrition data functions + 4 placeholder refactors complete.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/data_layer/__init__.py

@@ -30,9 +30,9 @@ from .utils import *
 
 # Metric modules
 from .body_metrics import *
+from .nutrition_metrics import *
 
 # Future imports (will be added as modules are created):
-# from .nutrition_metrics import *
 # from .activity_metrics import *
 # from .recovery_metrics import *
 # from .health_metrics import *
@@ -48,4 +48,12 @@ __all__ = [
     'get_weight_trend_data',
     'get_body_composition_data',
     'get_circumference_summary_data',
+
+    # Nutrition Metrics
+    'get_nutrition_average_data',
+    'get_nutrition_days_data',
+    'get_protein_targets_data',
+    'get_energy_balance_data',
+    'get_protein_adequacy_data',
+    'get_macro_consistency_data',
 ]

backend/data_layer/nutrition_metrics.py

@@ -0,0 +1,482 @@
+"""
+Nutrition Metrics Data Layer
+
+Provides structured data for nutrition tracking and analysis.
+
+Functions:
+    - get_nutrition_average_data(): Average calor
+
+ies, protein, carbs, fat
+    - get_nutrition_days_data(): Number of days with nutrition data
+    - get_protein_targets_data(): Protein targets based on weight
+    - get_energy_balance_data(): Energy balance calculation
+    - get_protein_adequacy_data(): Protein adequacy score
+    - get_macro_consistency_data(): Macro consistency analysis
+
+All functions return structured data (dict) without formatting.
+Use placeholder_resolver.py for formatted strings for AI.
+
+Phase 0c: Multi-Layer Architecture
+Version: 1.0
+"""
+
+from typing import Dict, List, Optional
+from datetime import datetime, timedelta, date
+from db import get_db, get_cursor, r2d
+from data_layer.utils import calculate_confidence, safe_float, safe_int
+
+
+def get_nutrition_average_data(
+    profile_id: str,
+    days: int = 30
+) -> Dict:
+    """
+    Get average nutrition values for all macros.
+
+    Args:
+        profile_id: User profile ID
+        days: Analysis window (default 30)
+
+    Returns:
+        {
+            "kcal_avg": float,
+            "protein_avg": float,
+            "carbs_avg": float,
+            "fat_avg": float,
+            "data_points": int,
+            "confidence": str,
+            "days_analyzed": int
+        }
+
+    Migration from Phase 0b:
+        OLD: get_nutrition_avg(pid, field, days) per field
+        NEW: All macros in one call
+    """
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
+
+        cur.execute(
+            """SELECT
+                AVG(kcal) as kcal_avg,
+                AVG(protein_g) as protein_avg,
+                AVG(carbs_g) as carbs_avg,
+                AVG(fat_g) as fat_avg,
+                COUNT(*) as data_points
+               FROM nutrition_log
+               WHERE profile_id=%s AND date >= %s""",
+            (profile_id, cutoff)
+        )
+        row = cur.fetchone()
+
+        if not row or row['data_points'] == 0:
+            return {
+                "kcal_avg": 0.0,
+                "protein_avg": 0.0,
+                "carbs_avg": 0.0,
+                "fat_avg": 0.0,
+                "data_points": 0,
+                "confidence": "insufficient",
+                "days_analyzed": days
+            }
+
+        data_points = row['data_points']
+        confidence = calculate_confidence(data_points, days, "general")
+
+        return {
+            "kcal_avg": safe_float(row['kcal_avg']),
+            "protein_avg": safe_float(row['protein_avg']),
+            "carbs_avg": safe_float(row['carbs_avg']),
+            "fat_avg": safe_float(row['fat_avg']),
+            "data_points": data_points,
+            "confidence": confidence,
+            "days_analyzed": days
+        }
+
+
+def get_nutrition_days_data(
+    profile_id: str,
+    days: int = 30
+) -> Dict:
+    """
+    Count days with nutrition data.
+
+    Args:
+        profile_id: User profile ID
+        days: Analysis window (default 30)
+
+    Returns:
+        {
+            "days_with_data": int,
+            "days_analyzed": int,
+            "coverage_pct": float,
+            "confidence": str
+        }
+    """
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
+
+        cur.execute(
+            """SELECT COUNT(DISTINCT date) as days
+               FROM nutrition_log
+               WHERE profile_id=%s AND date >= %s""",
+            (profile_id, cutoff)
+        )
+        row = cur.fetchone()
+        days_with_data = row['days'] if row else 0
+
+        coverage_pct = (days_with_data / days * 100) if days > 0 else 0
+        confidence = calculate_confidence(days_with_data, days, "general")
+
+        return {
+            "days_with_data": days_with_data,
+            "days_analyzed": days,
+            "coverage_pct": coverage_pct,
+            "confidence": confidence
+        }
+
+
+def get_protein_targets_data(
+    profile_id: str
+) -> Dict:
+    """
+    Calculate protein targets based on current weight.
+
+    Targets:
+        - Low: 1.6 g/kg (maintenance)
+        - High: 2.2 g/kg (muscle building)
+
+    Args:
+        profile_id: User profile ID
+
+    Returns:
+        {
+            "current_weight": float,
+            "protein_target_low": float,   # 1.6 g/kg
+            "protein_target_high": float,  # 2.2 g/kg
+            "confidence": str
+        }
+    """
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """SELECT weight FROM weight_log
+               WHERE profile_id=%s ORDER BY date DESC LIMIT 1""",
+            (profile_id,)
+        )
+        row = cur.fetchone()
+
+        if not row:
+            return {
+                "current_weight": 0.0,
+                "protein_target_low": 0.0,
+                "protein_target_high": 0.0,
+                "confidence": "insufficient"
+            }
+
+        weight = safe_float(row['weight'])
+
+        return {
+            "current_weight": weight,
+            "protein_target_low": weight * 1.6,
+            "protein_target_high": weight * 2.2,
+            "confidence": "high"
+        }
+
+
+def get_energy_balance_data(
+    profile_id: str,
+    days: int = 7
+) -> Dict:
+    """
+    Calculate energy balance (intake - estimated expenditure).
+
+    Note: This is a simplified calculation.
+    For accurate TDEE, use profile-based calculations.
+
+    Args:
+        profile_id: User profile ID
+        days: Analysis window (default 7)
+
+    Returns:
+        {
+            "energy_balance": float,        # kcal/day (negative = deficit)
+            "avg_intake": float,
+            "estimated_tdee": float,
+            "status": str,                  # "deficit" | "surplus" | "maintenance"
+            "confidence": str,
+            "days_analyzed": int,
+            "data_points": int
+        }
+    """
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
+
+        # Get average intake
+        cur.execute(
+            """SELECT AVG(kcal) as avg_kcal, COUNT(*) as cnt
+               FROM nutrition_log
+               WHERE profile_id=%s AND date >= %s AND kcal IS NOT NULL""",
+            (profile_id, cutoff)
+        )
+        row = cur.fetchone()
+
+        if not row or row['cnt'] == 0:
+            return {
+                "energy_balance": 0.0,
+                "avg_intake": 0.0,
+                "estimated_tdee": 0.0,
+                "status": "unknown",
+                "confidence": "insufficient",
+                "days_analyzed": days,
+                "data_points": 0
+            }
+
+        avg_intake = safe_float(row['avg_kcal'])
+        data_points = row['cnt']
+
+        # Simple TDEE estimation (this should be improved with profile data)
+        # For now, use a rough estimate: 2500 kcal for average adult
+        estimated_tdee = 2500.0  # TODO: Calculate from profile (weight, height, age, activity)
+
+        energy_balance = avg_intake - estimated_tdee
+
+        # Determine status
+        if energy_balance < -200:
+            status = "deficit"
+        elif energy_balance > 200:
+            status = "surplus"
+        else:
+            status = "maintenance"
+
+        confidence = calculate_confidence(data_points, days, "general")
+
+        return {
+            "energy_balance": energy_balance,
+            "avg_intake": avg_intake,
+            "estimated_tdee": estimated_tdee,
+            "status": status,
+            "confidence": confidence,
+            "days_analyzed": days,
+            "data_points": data_points
+        }
+
+
+def get_protein_adequacy_data(
+    profile_id: str,
+    days: int = 28
+) -> Dict:
+    """
+    Calculate protein adequacy score (0-100).
+
+    Score based on:
+    - Daily protein intake vs. target (1.6-2.2 g/kg)
+    - Consistency across days
+
+    Args:
+        profile_id: User profile ID
+        days: Analysis window (default 28)
+
+    Returns:
+        {
+            "adequacy_score": int,          # 0-100
+            "avg_protein_g": float,
+            "target_protein_low": float,
+            "target_protein_high": float,
+            "protein_g_per_kg": float,
+            "days_in_target": int,
+            "days_with_data": int,
+            "confidence": str
+        }
+    """
+    # Get protein targets
+    targets = get_protein_targets_data(profile_id)
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
+
+        cur.execute(
+            """SELECT
+                AVG(protein_g) as avg_protein,
+                COUNT(*) as cnt,
+                SUM(CASE WHEN protein_g >= %s AND protein_g <= %s THEN 1 ELSE 0 END) as days_in_target
+               FROM nutrition_log
+               WHERE profile_id=%s AND date >= %s AND protein_g IS NOT NULL""",
+            (targets['protein_target_low'], targets['protein_target_high'], profile_id, cutoff)
+        )
+        row = cur.fetchone()
+
+        if not row or row['cnt'] == 0:
+            return {
+                "adequacy_score": 0,
+                "avg_protein_g": 0.0,
+                "target_protein_low": targets['protein_target_low'],
+                "target_protein_high": targets['protein_target_high'],
+                "protein_g_per_kg": 0.0,
+                "days_in_target": 0,
+                "days_with_data": 0,
+                "confidence": "insufficient"
+            }
+
+        avg_protein = safe_float(row['avg_protein'])
+        days_with_data = row['cnt']
+        days_in_target = row['days_in_target']
+
+        protein_g_per_kg = avg_protein / targets['current_weight'] if targets['current_weight'] > 0 else 0.0
+
+        # Calculate adequacy score
+        # 100 = always in target range
+        # Scale based on percentage of days in target + average relative to target
+        target_pct = (days_in_target / days_with_data * 100) if days_with_data > 0 else 0
+
+        # Bonus/penalty for average protein level
+        target_mid = (targets['protein_target_low'] + targets['protein_target_high']) / 2
+        avg_vs_target = (avg_protein / target_mid) if target_mid > 0 else 0
+
+        # Weighted score: 70% target days, 30% average level
+        adequacy_score = int(target_pct * 0.7 + min(avg_vs_target * 100, 100) * 0.3)
+        adequacy_score = max(0, min(100, adequacy_score))  # Clamp to 0-100
+
+        confidence = calculate_confidence(days_with_data, days, "general")
+
+        return {
+            "adequacy_score": adequacy_score,
+            "avg_protein_g": avg_protein,
+            "target_protein_low": targets['protein_target_low'],
+            "target_protein_high": targets['protein_target_high'],
+            "protein_g_per_kg": protein_g_per_kg,
+            "days_in_target": days_in_target,
+            "days_with_data": days_with_data,
+            "confidence": confidence
+        }
+
+
+def get_macro_consistency_data(
+    profile_id: str,
+    days: int = 28
+) -> Dict:
+    """
+    Calculate macro consistency score (0-100).
+
+    Measures how consistent macronutrient ratios are across days.
+    High consistency = predictable nutrition, easier to track progress.
+
+    Args:
+        profile_id: User profile ID
+        days: Analysis window (default 28)
+
+    Returns:
+        {
+            "consistency_score": int,       # 0-100 (100 = very consistent)
+            "avg_protein_pct": float,
+            "avg_carbs_pct": float,
+            "avg_fat_pct": float,
+            "std_dev_protein": float,       # Standard deviation
+            "std_dev_carbs": float,
+            "std_dev_fat": float,
+            "confidence": str,
+            "data_points": int
+        }
+    """
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
+
+        cur.execute(
+            """SELECT
+                protein_g, carbs_g, fat_g, kcal
+               FROM nutrition_log
+               WHERE profile_id=%s
+                 AND date >= %s
+                 AND protein_g IS NOT NULL
+                 AND carbs_g IS NOT NULL
+                 AND fat_g IS NOT NULL
+                 AND kcal > 0
+               ORDER BY date""",
+            (profile_id, cutoff)
+        )
+        rows = cur.fetchall()
+
+        if len(rows) < 3:
+            return {
+                "consistency_score": 0,
+                "avg_protein_pct": 0.0,
+                "avg_carbs_pct": 0.0,
+                "avg_fat_pct": 0.0,
+                "std_dev_protein": 0.0,
+                "std_dev_carbs": 0.0,
+                "std_dev_fat": 0.0,
+                "confidence": "insufficient",
+                "data_points": len(rows)
+            }
+
+        # Calculate macro percentages for each day
+        import statistics
+
+        protein_pcts = []
+        carbs_pcts = []
+        fat_pcts = []
+
+        for row in rows:
+            total_kcal = safe_float(row['kcal'])
+            if total_kcal == 0:
+                continue
+
+            # Convert grams to kcal (protein=4, carbs=4, fat=9)
+            protein_kcal = safe_float(row['protein_g']) * 4
+            carbs_kcal = safe_float(row['carbs_g']) * 4
+            fat_kcal = safe_float(row['fat_g']) * 9
+
+            macro_kcal_total = protein_kcal + carbs_kcal + fat_kcal
+
+            if macro_kcal_total > 0:
+                protein_pcts.append(protein_kcal / macro_kcal_total * 100)
+                carbs_pcts.append(carbs_kcal / macro_kcal_total * 100)
+                fat_pcts.append(fat_kcal / macro_kcal_total * 100)
+
+        if len(protein_pcts) < 3:
+            return {
+                "consistency_score": 0,
+                "avg_protein_pct": 0.0,
+                "avg_carbs_pct": 0.0,
+                "avg_fat_pct": 0.0,
+                "std_dev_protein": 0.0,
+                "std_dev_carbs": 0.0,
+                "std_dev_fat": 0.0,
+                "confidence": "insufficient",
+                "data_points": len(protein_pcts)
+            }
+
+        # Calculate averages and standard deviations
+        avg_protein_pct = statistics.mean(protein_pcts)
+        avg_carbs_pct = statistics.mean(carbs_pcts)
+        avg_fat_pct = statistics.mean(fat_pcts)
+
+        std_protein = statistics.stdev(protein_pcts) if len(protein_pcts) > 1 else 0.0
+        std_carbs = statistics.stdev(carbs_pcts) if len(carbs_pcts) > 1 else 0.0
+        std_fat = statistics.stdev(fat_pcts) if len(fat_pcts) > 1 else 0.0
+
+        # Consistency score: inverse of average standard deviation
+        # Lower std_dev = higher consistency
+        avg_std = (std_protein + std_carbs + std_fat) / 3
+
+        # Score: 100 - (avg_std * scale_factor)
+        # avg_std of 5% = score 75, avg_std of 10% = score 50, avg_std of 20% = score 0
+        consistency_score = max(0, min(100, int(100 - (avg_std * 5))))
+
+        confidence = calculate_confidence(len(protein_pcts), days, "general")
+
+        return {
+            "consistency_score": consistency_score,
+            "avg_protein_pct": avg_protein_pct,
+            "avg_carbs_pct": avg_carbs_pct,
+            "avg_fat_pct": avg_fat_pct,
+            "std_dev_protein": std_protein,
+            "std_dev_carbs": std_carbs,
+            "std_dev_fat": std_fat,
+            "confidence": confidence,
+            "data_points": len(protein_pcts)
+        }

backend/placeholder_resolver.py

@@ -18,6 +18,11 @@ from data_layer.body_metrics import (
     get_body_composition_data,
     get_circumference_summary_data
 )
+from data_layer.nutrition_metrics import (
+    get_nutrition_average_data,
+    get_nutrition_days_data,
+    get_protein_targets_data
+)
 
 
 # ── Helper Functions ──────────────────────────────────────────────────────────
@@ -81,33 +86,32 @@ def get_latest_bf(profile_id: str) -> Optional[str]:
 
 
 def get_nutrition_avg(profile_id: str, field: str, days: int = 30) -> str:
-    """Calculate average nutrition value."""
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
+    """
+    Calculate average nutrition value.
 
-        # Map field names to actual column names
-        field_map = {
-            'protein': 'protein_g',
-            'fat': 'fat_g',
-            'carb': 'carbs_g',
-            'kcal': 'kcal'
-        }
-        db_field = field_map.get(field, field)
+    Phase 0c: Refactored to use data_layer.nutrition_metrics.get_nutrition_average_data()
+    This function now only FORMATS the data for AI consumption.
+    """
+    data = get_nutrition_average_data(profile_id, days)
 
-        cur.execute(
-            f"""SELECT AVG({db_field}) as avg FROM nutrition_log
-                WHERE profile_id=%s AND date >= %s AND {db_field} IS NOT NULL""",
-            (profile_id, cutoff)
-        )
-        row = cur.fetchone()
-        if row and row['avg']:
-            if field == 'kcal':
-                return f"{int(row['avg'])} kcal/Tag (Ø {days} Tage)"
-            else:
-                return f"{int(row['avg'])}g/Tag (Ø {days} Tage)"
+    if data['confidence'] == 'insufficient':
         return "nicht verfügbar"
 
+    # Map field names to data keys
+    field_map = {
+        'protein': 'protein_avg',
+        'fat': 'fat_avg',
+        'carb': 'carbs_avg',
+        'kcal': 'kcal_avg'
+    }
+    data_key = field_map.get(field, f'{field}_avg')
+    value = data.get(data_key, 0)
+
+    if field == 'kcal':
+        return f"{int(value)} kcal/Tag (Ø {days} Tage)"
+    else:
+        return f"{int(value)}g/Tag (Ø {days} Tage)"
+
 
 def get_caliper_summary(profile_id: str) -> str:
     """Get latest caliper measurements summary."""
@@ -178,48 +182,45 @@ def get_goal_bf_pct(profile_id: str) -> str:
 
 
 def get_nutrition_days(profile_id: str, days: int = 30) -> str:
-    """Get number of days with nutrition data."""
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-        cur.execute(
-            """SELECT COUNT(DISTINCT date) as days FROM nutrition_log
-               WHERE profile_id=%s AND date >= %s""",
-            (profile_id, cutoff)
-        )
-        row = cur.fetchone()
-        return str(row['days']) if row else "0"
+    """
+    Get number of days with nutrition data.
+
+    Phase 0c: Refactored to use data_layer.nutrition_metrics.get_nutrition_days_data()
+    This function now only FORMATS the data for AI consumption.
+    """
+    data = get_nutrition_days_data(profile_id, days)
+    return str(data['days_with_data'])
 
 
 def get_protein_ziel_low(profile_id: str) -> str:
-    """Calculate lower protein target based on current weight (1.6g/kg)."""
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cur.execute(
-            """SELECT weight FROM weight_log
-               WHERE profile_id=%s ORDER BY date DESC LIMIT 1""",
-            (profile_id,)
-        )
-        row = cur.fetchone()
-        if row:
-            return f"{int(float(row['weight']) * 1.6)}"
+    """
+    Calculate lower protein target based on current weight (1.6g/kg).
+
+    Phase 0c: Refactored to use data_layer.nutrition_metrics.get_protein_targets_data()
+    This function now only FORMATS the data for AI consumption.
+    """
+    data = get_protein_targets_data(profile_id)
+
+    if data['confidence'] == 'insufficient':
         return "nicht verfügbar"
 
+    return f"{int(data['protein_target_low'])}"
+
 
 def get_protein_ziel_high(profile_id: str) -> str:
-    """Calculate upper protein target based on current weight (2.2g/kg)."""
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cur.execute(
-            """SELECT weight FROM weight_log
-               WHERE profile_id=%s ORDER BY date DESC LIMIT 1""",
-            (profile_id,)
-        )
-        row = cur.fetchone()
-        if row:
-            return f"{int(float(row['weight']) * 2.2)}"
+    """
+    Calculate upper protein target based on current weight (2.2g/kg).
+
+    Phase 0c: Refactored to use data_layer.nutrition_metrics.get_protein_targets_data()
+    This function now only FORMATS the data for AI consumption.
+    """
+    data = get_protein_targets_data(profile_id)
+
+    if data['confidence'] == 'insufficient':
         return "nicht verfügbar"
 
+    return f"{int(data['protein_target_high'])}"
+
 
 def get_activity_summary(profile_id: str, days: int = 14) -> str:
     """Get activity summary for recent period."""