initial pre-viable version of watch app

Workouts/Views/Exercises/WeightProgressionChartView.swift

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+//
+// WeightProgressionChartView.swift
+// Workouts
+//
+// Created on 7/20/25.
+//
+// Copyright 2025 Rouslan Zenetl. All Rights Reserved.
+//
+
+import SwiftUI
+import Charts
+import SwiftData
+
+struct WeightProgressionChartView: View {
+    @Environment(\.modelContext) private var modelContext
+    
+    let exerciseName: String
+    @State private var weightData: [WeightDataPoint] = []
+    @State private var isLoading: Bool = true
+    @State private var motivationalMessage: String = ""
+    
+    var body: some View {
+        VStack(alignment: .leading) {
+            if isLoading {
+                ProgressView("Loading data...")
+            } else if weightData.isEmpty {
+                Text("No weight history available yet.")
+                    .foregroundColor(.secondary)
+                    .frame(maxWidth: .infinity, alignment: .center)
+                    .padding()
+            } else {
+                Text("Weight Progression")
+                    .font(.headline)
+                    .padding(.bottom, 4)
+                
+                Chart {
+                    ForEach(weightData) { dataPoint in
+                        LineMark(
+                            x: .value("Date", dataPoint.date),
+                            y: .value("Weight", dataPoint.weight)
+                        )
+                        .foregroundStyle(Color.blue.gradient)
+                        .interpolationMethod(.catmullRom)
+                        
+                        PointMark(
+                            x: .value("Date", dataPoint.date),
+                            y: .value("Weight", dataPoint.weight)
+                        )
+                        .foregroundStyle(Color.blue)
+                    }
+                }
+                .chartYScale(domain: .automatic(includesZero: false))
+                .chartXAxis {
+                    AxisMarks(values: .automatic) { value in
+                        AxisGridLine()
+                        AxisValueLabel(format: .dateTime.month().day())
+                    }
+                }
+                .frame(height: 200)
+                .padding(.bottom, 8)
+                
+                if !motivationalMessage.isEmpty {
+                    Text(motivationalMessage)
+                        .font(.subheadline)
+                        .foregroundColor(.primary)
+                        .padding()
+                        .background(Color.blue.opacity(0.1))
+                        .cornerRadius(8)
+                }
+            }
+        }
+        .padding()
+        .onAppear {
+            loadWeightData()
+        }
+    }
+    
+    private func loadWeightData() {
+        isLoading = true
+        
+        // Create a fetch descriptor to get workout logs for this exercise
+        let descriptor = FetchDescriptor<WorkoutLog>(
+            predicate: #Predicate<WorkoutLog> { log in
+                log.exerciseName == exerciseName && log.completed == true
+            },
+            sortBy: [SortDescriptor(\WorkoutLog.date)]
+        )
+        
+        // Fetch the data
+        if let logs = try? modelContext.fetch(descriptor) {
+            // Convert to data points
+            weightData = logs.map { log in
+                WeightDataPoint(date: log.date, weight: log.weight)
+            }
+            
+            // Generate motivational message based on progress
+            generateMotivationalMessage()
+        }
+        
+        isLoading = false
+    }
+    
+    private func generateMotivationalMessage() {
+        guard weightData.count >= 2 else {
+            motivationalMessage = "Complete more workouts to track your progress!"
+            return
+        }
+        
+        // Calculate progress metrics
+        let firstWeight = weightData.first?.weight ?? 0
+        let currentWeight = weightData.last?.weight ?? 0
+        let weightDifference = currentWeight - firstWeight
+        
+        // Generate appropriate message based on progress
+        if weightDifference > 0 {
+            let percentIncrease = Int((Double(weightDifference) / Double(firstWeight)) * 100)
+            if percentIncrease >= 20 {
+                motivationalMessage = "Amazing progress! You've increased your weight by \(weightDifference) lbs (\(percentIncrease)%)! 💪"
+            } else if percentIncrease >= 10 {
+                motivationalMessage = "Great job! You've increased your weight by \(weightDifference) lbs (\(percentIncrease)%)! 🎉"
+            } else {
+                motivationalMessage = "You're making progress! Weight increased by \(weightDifference) lbs. Keep it up! 👍"
+            }
+        } else if weightDifference == 0 {
+            motivationalMessage = "You're maintaining consistent weight. Focus on form and consider increasing when ready!"
+        } else {
+            motivationalMessage = "Your current weight is lower than when you started. Adjust your training as needed and keep pushing!"
+        }
+    }
+}
+
+// Data structure for chart points
+struct WeightDataPoint: Identifiable {
+    let id = UUID()
+    let date: Date
+    let weight: Int
+}
+
+#Preview {
+    WeightProgressionChartView(exerciseName: "Bench Press")
+        .modelContainer(for: [WorkoutLog.self], inMemory: true)
+}