Flash Cards now used stored lesson information

Toki Trainer/Views/FlashCardLessonsView.swift

@@ -8,14 +8,76 @@
 import SwiftUI
 
 struct FlashCardLessonsView: View {
+    @Environment(\.managedObjectContext) private var viewContext
+    
+    @FetchRequest(fetchRequest: K.getFlashCardAnswersFetchRequest) var answers: FetchedResults<FlashCardAnswer>
+    @FetchRequest(fetchRequest: K.getLessonAnswersFetchRequest) var lessonAnswers: FetchedResults<LessonAnswer>
+    
     @ObservedObject var flashCardLessonsVM = FlashCardLessonsViewModel()
     
+    @State private var lessonStatistics: [String: Double] = [:]
+    @State private var statisticsCalculated = false
+    
+    func calculateStatistics(_ lesson: TokiLesson) {
+        for lessonAnswer in lessonAnswers {
+            if lessonAnswer.lesson == lesson.lesson {
+                self.lessonStatistics[lesson.lesson] = (Double(lessonAnswer.correctCount) / Double(lessonAnswer.triesCount) * 100)
+            }
+        }
+        self.statisticsCalculated = true
+    }
+//    func calculateStatistics(_ lesson: TokiLesson) {
+//        for answer in answers {
+//            wordStatistics[answer.word!] = (Double(answer.correctCount) / Double(answer.triesCount)) * 100
+//        }
+//
+//
+//        for word in lesson.words {
+//            buildLessonStatistics[lesson.lesson] = []
+//            buildLessonStatistics[lesson.lesson]?.append(wordStatistics[word.word]!)
+//        }
+//
+//        for (key, value) in buildLessonStatistics {
+//            let sumArray = value.reduce(0, +)
+//            let avgArrayValue = sumArray / Double(value.count)
+//            lessonStatistics[key] = avgArrayValue
+//        }
+//
+//
+////        for word in lesson.words {
+////            for answer in answers {
+////                if answer.word == word.word {
+////                    lessonStatistics[lesson.lesson] = (Double(answer.correctCount) / Double(answer.triesCount)) * 100
+////                }
+////            }
+////        }
+//        self.statisticsCalculated = true
+//    }
+    
+    func calculateBackgroundColor(_ percent: Double) -> Color {
+        if percent >= 80 {
+            return Color.green
+        } else if percent >= 40 {
+            return Color.yellow
+        } else {
+            return Color.red
+        }
+    }
+    
     var body: some View {
         NavigationView {
             List(flashCardLessonsVM.lessons, id: \.lesson) { lesson in
-                NavigationLink(destination: FlashCardView(lesson.words)) {
+                NavigationLink(destination: FlashCardView(lesson: lesson.lesson, passedDictionary: lesson.words)) {
                     Text(lesson.lesson)
                         .bold()
+                        .onAppear {
+                            calculateStatistics(lesson)
+                        }
+                    Spacer()
+                    if statisticsCalculated && lessonStatistics[lesson.lesson] != 0.0 && lessonStatistics[lesson.lesson] != nil {
+                        Text("\(String(format: "%.0f", lessonStatistics[lesson.lesson]!)) %")
+                            .multilineTextAlignment(.leading)
+                    }
                 }
             }
             .navigationBarTitle("Lessons")