//
//  Solsnu_Widget.swift
//  Solsnu.Widget
//
//  Created by Ivar Løvlie on 15/12/2025.
//

import WidgetKit
import SwiftUI

struct Provider: TimelineProvider {
    func placeholder(in context: Context) -> SolvervEntry {
        SolvervEntry(def: SolvervDef(date: Date()))
    }

    func getSnapshot(in context: Context, completion: @escaping (SolvervEntry) -> ()) {
        let entry = SolvervEntry(def: SolvervDef(date: Date()))
        completion(entry)
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<Entry>) -> ()) {
        var entries: [SolvervEntry] = []
        let currentDate = Date()
        for hourOffset in 0 ..< 5 {
            let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
            let entry = SolvervEntry(def: SolvervDef(date: currentDate))
            entries.append(entry)
        }

        let timeline = Timeline(entries: entries, policy: .atEnd)
        completion(timeline)
    }
}

struct SolvervEntry: TimelineEntry {
    let date: Date
    let emoji: String
    let def: SolvervDef
    
    init(def: SolvervDef, date: Date? = nil) {
        self.date = date ?? def.date
        self.emoji = def.emoji()
        self.def = def;
    }
}

struct Solsnu_WidgetEntryView : View {
    var entry: Provider.Entry

    var body: some View {
        VStack {
            Text("Time:")
            Text(entry.date, style: .time)

            Text("Emoji:")
            Text(entry.emoji)
        }
    }
}

struct Solsnu_Widget: Widget {
    let kind: String = "Solsnu_Widget"

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: Provider()) { entry in
            if #available(iOS 17.0, *) {
                Solsnu_WidgetEntryView(entry: entry)
                    .containerBackground(.fill.tertiary, for: .widget)
            } else {
                Solsnu_WidgetEntryView(entry: entry)
                    .padding()
                    .background()
            }
        }
        .configurationDisplayName("My Widget")
        .description("This is an example widget.")
    }
}

#Preview(as: .systemSmall) {
    Solsnu_Widget()
} timeline: {
    SolvervEntry(def: SolvervDef(utcString: "2025-09-22 18:20:00"))
    SolvervEntry(def: SolvervDef(utcString: "2025-12-21 15:03:00"))
    SolvervEntry(def: SolvervDef(utcString: "2026-03-20 14:46:00"))
    SolvervEntry(def: SolvervDef(utcString: "2026-06-21 08:25:00"))
    SolvervEntry(def: SolvervDef(utcString: "2026-09-23 00:06:00"))
    SolvervEntry(def: SolvervDef(utcString: "2026-12-21 20:50:00"))
    SolvervEntry(def: SolvervDef(utcString: "2027-03-20 20:25:00"))
    SolvervEntry(def: SolvervDef(utcString: "2027-06-21 14:11:00"))
    SolvervEntry(def: SolvervDef(utcString: "2027-09-23 06:02:00"))
    SolvervEntry(def: SolvervDef(utcString: "2027-12-22 02:43:00"))
    SolvervEntry(def: SolvervDef(utcString: "2028-03-20 02:17:00"))
    SolvervEntry(def: SolvervDef(utcString: "2028-06-20 20:02:00"))
    SolvervEntry(def: SolvervDef(utcString: "2028-09-22 11:45:00"))
    SolvervEntry(def: SolvervDef(utcString: "2028-12-21 08:20:00"))
    SolvervEntry(def: SolvervDef(utcString: "2029-03-20 08:01:00"))
    SolvervEntry(def: SolvervDef(utcString: "2029-06-21 01:48:00"))
    SolvervEntry(def: SolvervDef(utcString: "2029-09-22 17:37:00"))
    SolvervEntry(def: SolvervDef(utcString: "2029-12-21 14:14:00"))
    SolvervEntry(def: SolvervDef(utcString: "2030-03-20 13:51:00"))
    SolvervEntry(def: SolvervDef(utcString: "2030-06-21 07:31:00"))
    SolvervEntry(def: SolvervDef(utcString: "2030-09-22 23:27:00"))
    SolvervEntry(def: SolvervDef(utcString: "2030-12-21 20:09:00"))
}

struct SolvervDef {
    let date: Date;
    
    init(date:Date) {
        self.date = date;
    }
    
    init(utcString:String) {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        formatter.timeZone = TimeZone(abbreviation: "UTC")
        // Should probably guard this, but not now
        let date = formatter.date(from: utcString)!
        self.date = date
    }
    
    func emoji() -> String {
        let components = Calendar.current.dateComponents([.year,.month,.day,.hour,.minute], from: date)
        let hour = components.hour!
        let minute = components.minute!
        if hour == 2 && minute == 43 {
            return "😀"
        } else {
            return ""
        }
    }
}