BlueWallet/ios/WalletInformationWidget/Widgets/MarketWidget/MarketWidget.swift

//
//  MarketWidget.swift
//  MarketWidget
//
//  Created by Marcos Rodriguez on 11/6/20.
//  Copyright © 2020 BlueWallet. All rights reserved.
//

import WidgetKit
import SwiftUI

struct Provider: TimelineProvider {
    func placeholder(in context: Context) -> SimpleEntry {
      SimpleEntry(date: Date(), marketData: emptyMarketData)
    }

    func getSnapshot(in context: Context, completion: @escaping (SimpleEntry) -> ()) {
      let entry: SimpleEntry
      if (context.isPreview) {
        entry = SimpleEntry(date: Date(), marketData: MarketData(nextBlock: "26", sats: "9 134", price: "$10 000", rate: 10000))
      } else {
        entry = SimpleEntry(date: Date(), marketData: emptyMarketData)
      }
      completion(entry)
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<Entry>) -> ()) {
      var entries: [SimpleEntry] = []
      let userPreferredCurrency = WidgetAPI.getUserPreferredCurrency();
      let marketDataEntry = MarketData(nextBlock: "...", sats: "...", price: "...", rate: 0)
      WidgetAPI.fetchMarketData(currency: userPreferredCurrency, completion: { (result, error) in
        let entry: SimpleEntry
        if let result = result {
          entry = SimpleEntry(date: Date(), marketData: result)
          
        } else {
          entry = SimpleEntry(date: Date(), marketData: marketDataEntry)
        }
        entries.append(entry)
        let timeline = Timeline(entries: entries, policy: .atEnd)
        completion(timeline)
      })
    }
}

struct SimpleEntry: TimelineEntry {
    let date: Date
  let marketData: MarketData
}

struct MarketWidgetEntryView : View {
    var entry: Provider.Entry
  
  var MarketStack: some View {
    MarketView(marketData: entry.marketData).padding(EdgeInsets(top: 18, leading: 11, bottom: 18, trailing: 11))
  }

    var body: some View {
      MarketStack.background(Color.widgetBackground)
    }
}

@main
struct MarketWidget: Widget {
    let kind: String = "MarketWidget"

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: Provider()) { entry in
            MarketWidgetEntryView(entry: entry)
        }
        .configurationDisplayName("Market")
        .description("View the current market information.").supportedFamilies([.systemSmall])
    }
}

struct MarketWidget_Previews: PreviewProvider {
    static var previews: some View {
      MarketWidgetEntryView(entry: SimpleEntry(date: Date(), marketData: MarketData(nextBlock: "26", sats: "9 134", price: "$10,000", rate: 0)))
        .previewContext(WidgetPreviewContext(family: .systemSmall))
    }
}