Trio/FreeAPS/Sources/Modules/Stat/View/ViewElements/MealStatsView.swift

import Charts
import SwiftUI

struct MealStatsView: View {
    let mealStats: [MealStats]
    let selectedDuration: Stat.StateModel.Duration

    private var hasData: Bool {
        mealStats.contains { $0.carbs > 0 || $0.fat > 0 || $0.protein > 0 }
    }

    var body: some View {
        ScrollView {
            if mealStats.isEmpty || !hasData {
                ContentUnavailableView(
                    "No Meal Data",
                    systemImage: "fork.knife",
                    description: Text("Meal statistics will appear here once data is available.")
                )
            } else {
                StatCard {
                    VStack(alignment: .leading, spacing: 8) {
                        Text("Macronutrients")
                            .font(.headline)

                        Chart(mealStats) { stat in
                            // Carbs Bar
                            BarMark(
                                x: .value("Date", stat.date, unit: .day),
                                y: .value("Amount", stat.carbs),
                                width: .ratio(0.6)
                            )
                            .foregroundStyle(Color.orange)
                            .position(by: .value("Nutrient", "Carbs"))

                            // Fat Bar
                            BarMark(
                                x: .value("Date", stat.date, unit: .day),
                                y: .value("Amount", stat.fat),
                                width: .ratio(0.6)
                            )
                            .foregroundStyle(Color.yellow)
                            .position(by: .value("Nutrient", "Fat"))

                            // Protein Bar
                            BarMark(
                                x: .value("Date", stat.date, unit: .day),
                                y: .value("Amount", stat.protein),
                                width: .ratio(0.6)
                            )
                            .foregroundStyle(Color.green)
                            .position(by: .value("Nutrient", "Protein"))
                        }
                        .chartForegroundStyleScale([
                            "Carbs": Color.orange,
                            "Fat": Color.yellow,
                            "Protein": Color.green
                        ])
                        .chartLegend(position: .top, alignment: .leading, spacing: 12)
                        .frame(height: 200)
                        .chartXAxis {
                            mealChartXAxisMarks
                        }
                        .chartYAxis {
                            mealChartYAxisMarks
                        }
                    }
                }
                .padding()
            }
        }
    }

    private var mealChartXAxisMarks: some AxisContent {
        AxisMarks { value in
            if let date = value.as(Date.self) {
                AxisValueLabel {
                    switch selectedDuration {
                    case .Day,
                         .Today,
                         .Week:
                        Text(date, format: .dateTime.weekday(.abbreviated))
                    case .Month,
                         .Total:
                        Text(date, format: .dateTime.day().month(.defaultDigits))
                    }
                }
                AxisGridLine()
            }
        }
    }

    private var mealChartYAxisMarks: some AxisContent {
        AxisMarks(position: .leading) { value in
            if let amount = value.as(Double.self) {
                AxisValueLabel {
                    Text("\(Int(amount))g")
                }
                AxisGridLine()
            }
        }
    }
}