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//
//  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<SolvervEntry>) -> ()) {
        var entries: [SolvervEntry] = []
        let currentDate = Date()
        let entry = SolvervEntry(def: SolvervDef(date: currentDate))
        entries.append(entry)
        let calendar = Calendar.current
        var components = calendar.dateComponents([.year, .month, .day], from: currentDate)
        components.hour = 0
        components.minute = 0
        components.second = 0
        let todayMidnight = calendar.date(from: components)!
        let nextMidnight = calendar.date(byAdding: .day, value: 1, to: todayMidnight)!

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

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

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

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: Provider()) { entry in
                SmallWidgetView(entry: entry)
        }
        .contentMarginsDisabled()
        .configurationDisplayName("Solstice Countdown")
        .description("Days until next solstice or equinox")
        .supportedFamilies([.systemSmall,.systemMedium])
    }
}

#Preview(as: .systemSmall) {
    Solsnu_Widget()
} timeline: {
    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"))
}

struct SolvervDef {
    let date: Date;
    let bg: String;
    let sunriseTime: Date?;
    let sunsetTime: Date?;

    init(date: Date, sunriseTime: Date? = nil, sunsetTime: Date? = nil) {
        self.date = date;
        self.sunriseTime = sunriseTime;
        self.sunsetTime = sunsetTime;
        self.bg = "smallbg";
    }

    init(utcString: String, sunriseTime: Date? = nil, sunsetTime: Date? = nil) {
        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
        self.sunriseTime = sunriseTime
        self.sunsetTime = sunsetTime
        self.bg = "smallbg"
    }

    var sunriseFormatted: String {
        guard let time = sunriseTime else { return "" }
        let formatter = DateFormatter()
        formatter.dateFormat = "HH:mm"
        formatter.timeZone = TimeZone.current
        return formatter.string(from: time)
    }

    var sunsetFormatted: String {
        guard let time = sunsetTime else { return "" }
        let formatter = DateFormatter()
        formatter.dateFormat = "HH:mm"
        formatter.timeZone = TimeZone.current
        return formatter.string(from: time)
    }
}

extension SolvervDef {
    var season: Season {
        guard let next = nextEvent else { return .winter }
        return next.season
    }

    var nextEvent: SolsticeEvent? {
        SolsticeData.shared.nextEvent()
    }

    func daysUntilNext() -> Int {
        guard let next = nextEvent else { return 0 }
        return next.daysUntil()
    }

    func progressRatio() -> Double {
        guard let progress = SolsticeData.shared.progressToNextEvent() else { return 0.0 }
        let ratio = Double(progress.elapsed) / Double(progress.total)
        return max(0, min(1.0, ratio))
    }

    func upcomingEventsPreview(count: Int) -> [SolsticeEvent] {
        SolsticeData.shared.upcomingEvents(count: count)
    }

    static var preview: SolvervDef {
        SolvervDef(date: Date())
    }
}