import SwiftUI

// MARK: - Snapshot shared between app and widget

struct WidgetSnapshot: Codable {
    struct Item: Codable, Identifiable {
        var id: UUID
        var name: String
        var symbolName: String
        var colorHex: String
        var isDoneToday: Bool
    }

    var generatedAt: Date
    var items: [Item]

    static let empty = WidgetSnapshot(generatedAt: .now, items: [])
}

// MARK: - App Group backed store

enum SharedStore {
    static let appGroupID = "group.de.motocamp.HabitTracker"
    private static let key = "widgetSnapshot"

    private static var defaults: UserDefaults? {
        UserDefaults(suiteName: appGroupID)
    }

    static func save(_ snapshot: WidgetSnapshot) {
        guard let data = try? JSONEncoder().encode(snapshot) else { return }
        defaults?.set(data, forKey: key)
    }

    static func load() -> WidgetSnapshot {
        guard let data = defaults?.data(forKey: key),
              let snapshot = try? JSONDecoder().decode(WidgetSnapshot.self, from: data)
        else { return .empty }
        return snapshot
    }
}

// MARK: - Color from hex (used by both targets)

extension Color {
    /// Creates a color from a "#RRGGBB" hex string. Falls back to system green on bad input.
    init(hex: String) {
        let cleaned = hex.trimmingCharacters(in: CharacterSet(charactersIn: "#"))
        var value: UInt64 = 0
        Scanner(string: cleaned).scanHexInt64(&value)

        if cleaned.count == 6 {
            let r = Double((value >> 16) & 0xFF) / 255
            let g = Double((value >> 8) & 0xFF) / 255
            let b = Double(value & 0xFF) / 255
            self.init(.sRGB, red: r, green: g, blue: b)
        } else {
            self.init(.sRGB, red: 52 / 255, green: 199 / 255, blue: 89 / 255)
        }
    }
}