import WidgetKit
import SwiftUI

struct HabitsEntry: TimelineEntry {
    let date: Date
    let completed: Int
    let total: Int
    let tasksCount: Int
    var progress: Double { total > 0 ? Double(completed) / Double(total) : 0 }
}

struct HabitsProvider: TimelineProvider {
    func placeholder(in context: Context) -> HabitsEntry {
        HabitsEntry(date: Date(), completed: 3, total: 5, tasksCount: 2)
    }

    func getSnapshot(in context: Context, completion: @escaping (HabitsEntry) -> Void) {
        completion(currentEntry())
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<HabitsEntry>) -> Void) {
        let entry = currentEntry()
        let next = Calendar.current.date(byAdding: .minute, value: 15, to: Date()) ?? Date()
        completion(Timeline(entries: [entry], policy: .after(next)))
    }

    private func currentEntry() -> HabitsEntry {
        HabitsEntry(
            date: Date(),
            completed: WidgetData.habitsCompleted,
            total: WidgetData.habitsTotal,
            tasksCount: WidgetData.tasksCount
        )
    }
}

struct HabitsProgressWidget: Widget {
    let kind = "HabitsProgress"
    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: HabitsProvider()) { entry in
            HabitsWidgetView(entry: entry)
                .containerBackground(.fill.tertiary, for: .widget)
        }
        .configurationDisplayName("Прогресс дня")
        .description("Привычки и задачи на сегодня")
        .supportedFamilies([.systemSmall, .systemMedium])
    }
}

struct HabitsWidgetView: View {
    let entry: HabitsEntry
    @Environment(\.widgetFamily) var family

    var body: some View {
        Group {
            if family == .systemMedium { mediumView } else { smallView }
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .background(Color(hex: "06060f"))
    }

    var smallView: some View {
        VStack(spacing: 10) {
            ZStack {
                Circle().stroke(Color.white.opacity(0.1), lineWidth: 8).frame(width: 64, height: 64)
                Circle().trim(from: 0, to: entry.progress)
                    .stroke(Color(hex: "0D9488"), style: StrokeStyle(lineWidth: 8, lineCap: .round))
                    .frame(width: 64, height: 64).rotationEffect(.degrees(-90))
                VStack(spacing: 0) {
                    Text("\(entry.completed)").font(.system(size: 20, weight: .bold, design: .rounded)).foregroundColor(.white)
                    Text("/\(entry.total)").font(.system(size: 11)).foregroundColor(.gray)
                }
            }
            Text("Привычки").font(.caption2).foregroundColor(.gray)
        }
    }

    var mediumView: some View {
        HStack(spacing: 16) {
            ZStack {
                Circle().stroke(Color.white.opacity(0.1), lineWidth: 8).frame(width: 72, height: 72)
                Circle().trim(from: 0, to: entry.progress)
                    .stroke(Color(hex: "0D9488"), style: StrokeStyle(lineWidth: 8, lineCap: .round))
                    .frame(width: 72, height: 72).rotationEffect(.degrees(-90))
                VStack(spacing: 0) {
                    Text("\(entry.completed)").font(.system(size: 22, weight: .bold, design: .rounded)).foregroundColor(.white)
                    Text("/\(entry.total)").font(.system(size: 12)).foregroundColor(.gray)
                }
            }
            VStack(alignment: .leading, spacing: 8) {
                Text("Прогресс дня").font(.subheadline.bold()).foregroundColor(.white)
                HStack(spacing: 12) {
                    Label("\(entry.completed) готово", systemImage: "checkmark.circle.fill").font(.caption2).foregroundColor(Color(hex: "0D9488"))
                    Label("\(entry.tasksCount) задач", systemImage: "calendar").font(.caption2).foregroundColor(Color(hex: "6366f1"))
                }
                GeometryReader { geo in
                    ZStack(alignment: .leading) {
                        RoundedRectangle(cornerRadius: 3).fill(Color.white.opacity(0.1))
                        RoundedRectangle(cornerRadius: 3).fill(Color(hex: "0D9488")).frame(width: geo.size.width * entry.progress)
                    }
                }.frame(height: 6)
            }
        }.padding(16)
    }
}

extension Color {
    init(hex: String) {
        let hex = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        var int: UInt64 = 0; Scanner(string: hex).scanHexInt64(&int)
        let r, g, b: UInt64
        if hex.count == 6 { (r, g, b) = (int >> 16, int >> 8 & 0xFF, int & 0xFF) }
        else { (r, g, b) = (0, 0, 0) }
        self.init(.sRGB, red: Double(r)/255, green: Double(g)/255, blue: Double(b)/255)
    }
}