taler-ios

RiverHistoryView.swift (9675B)

---

 /*
  * This file is part of GNU Taler, ©2022-25 Taler Systems S.A.
  * See LICENSE.md
  */
 /**
  * @author Marc Stibane
  */
 import SwiftUI
 import Charts
 import os.log
 import SymLog
 import taler_swift
 
 fileprivate let lineWidth = 6.0
 fileprivate let river_back = "river-back"
 
 // MARK: -
 @available(iOS 16.4, *)
 struct RiverHistoryView: View {
     let stack: CallStack
     private let logger = Logger(subsystem: "net.taler.gnu", category: "River")
     let currency: OIMcurrency
     @Binding var shownItems: [HistoryItem]
     @Binding var dataPointWidth: CGFloat
     let scrollBack: Bool
 
     let maxXValue: Int           // #of dataPoints in history, plus spacers
     @State private var maxYValue: Double        // max balance
 
     @Namespace var riverID
     @State private var scrollPosition: Double = 0
     @State private var selectedTX: Int? = nil
     @State private var selectedY: Double? = nil
     @State private var selectedRange: ClosedRange<Double>?
     @State private var lastDelta: Double?
 
     init(stack: CallStack,
       currency: OIMcurrency, shownItems: Binding<[HistoryItem]>, dataPointWidth: Binding<CGFloat>,
          scrollBack: Bool, maxIndex: Int = 1, maxValue: Double = 200
     ) {
         self.stack = stack
         self.currency = currency
         self.scrollBack = scrollBack
         self._shownItems = shownItems
         self._dataPointWidth = dataPointWidth
         self.maxYValue = maxValue
         self.maxXValue = maxIndex
     }
 
     func selectTX(_ selected: Int?) {
         withAnimation {
             selectedTX = selected
         }
     }
 
     func historyItem(for xVal: Int) -> HistoryItem? {
         for item in shownItems {
             if item.distance == -xVal {
                 return item
             }
         }
         return nil
     }
 
     var body: some View {
 //    let _ = logger.log("RiverHistoryView \(width.pTwo)")
 
         ZStack(alignment: .top) {
             HStack(spacing: 0) {
                 VStack {
                     Image("Request")
                         .resizable()
                         .scaledToFit()
                         .frame(width: OIMbuttonSize, height: OIMbuttonSize)
                         .padding(.bottom, 30)
                     Image("SendMoney")
                         .resizable()
                         .scaledToFit()
                         .frame(width: OIMbuttonSize, height: OIMbuttonSize)
                         .padding(.vertical, 30)
                 }
                 ScrollViewReader { scrollProxy in
                     OptimalSize(.horizontal) {      // keep it small if we have only a few tx
                         ScrollView(.horizontal) {
                             if !shownItems.isEmpty {
                                 HStack(spacing: 0) {
                                     ForEach(-maxXValue...0, id: \.self) { xVal in
                                         RiverTileView(historyItem: historyItem(for: xVal)) {
                                             selectTX(xVal)
                                         }
                                     }
                                 }.id(riverID)
                             }
                         }
                         //.border(.blue)
                         .scrollBounceBehavior(.basedOnSize, axes: .horizontal)      // don't bounce if it's small
                         .task(id: scrollBack) {
                             logger.log("Task \(scrollBack)")
                             if scrollBack {
                                 DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                                     logger.log("Scrolling")
                                     withAnimation() {       // .easeOut(duration: 3.0)  doesn't work, always uses standard timing
                                         scrollProxy.scrollTo(riverID, anchor: .bottomTrailing)
                                     }
                                 }
                             }
                         }
                         .onTapGesture(count: 2) {
                             withAnimation(.easeOut(duration: 0.6)) {
                                 dataPointWidth = 100        // reset the scale first
                                 scrollProxy.scrollTo(riverID, anchor: .bottomTrailing)
                             }
                         }
                     }
                 } // ScrollViewReader
             }
             if let selectedTX {
                 if let item = historyItem(for: selectedTX) {
                     if let talerTX = item.talerTX {
                         HistoryDetailView(stack: stack.push(),
                                        currency: currency,
                                         balance: item.balance,
                                         talerTX: talerTX)
                         .onTapGesture { selectTX(nil) }
                     }
                 }
             }
         } // ZStack
     }
 }
 // MARK: -
 struct RiverTileView: View {
     let historyItem: HistoryItem?
     let selectTX: () -> Void
 
     func sizeIn(for value: Double) -> Int {
         if value < 100 { return 0 }
         if value < 300 { return 1 }
         if value < 500 { return 2 }
         if value < 750 { return 3 }
         else { return 4 }
     }
 
     func sizeOut(for value: Double) -> Int {
         if value < 31 { return 0 }
         if value < 80 { return 1 }
         if value < 200 { return 2 }
         if value < 500 { return 3 }
         else { return 4 }
     }
 
     func getDate(_ date: Date?) -> (Int, Int) {
         if let date {
             let components = Calendar.current.dateComponents([.day, .year, .month], from: date)
             return (components.day ?? 1, components.month ?? 1)
         }
         return(1, 1)
     }
 
     var body: some View {
         let txValue = historyItem?.talerTX?.common.amountEffective.value ?? 0
 //        let width = width(for: txValue)
         let tree = Image("Tree-without-shadow")
             .resizable()
 
         let treeSpace = 15.0
         let background = VStack(spacing: 0) {
             Color.brown     // add some random trees
                 .overlay(alignment: .topLeading) {
                     GeometryReader { geo in
                         let height = geo.size.height
                         let width = geo.size.width
 //                        let _ = print("width = \(width), height = \(height)")
                         let treeCount = Int.random(in: 23...57)
                         ForEach(0..<treeCount, id: \.self) { treeIndex in
                             let xOffset = Double.random(in: 3...width-treeSpace)
                             let yOffset = Double.random(in: 3...height-treeSpace)
                             let treeSize = Double.random(in: 10...20)
                             tree.frame(width: treeSize, height: treeSize)
                                 .offset(x: xOffset, y: yOffset)
                         }
                     }
                 }
             Color.yellow
         }
         let background2 = VStack(spacing: 0) {
             Color.brown
             Color.yellow
         }
 
         // transactions
         if let historyItem {
             if let talerTX = historyItem.talerTX {
                 let common = talerTX.common
                 let amount = common.amountEffective
                 let (dateString, date) = TalerDater.dateString(common.timestamp, true)
                 let (day, month) = getDate(date)
                 let sunImage = Image(systemName: SUNFILL)
                 let moonImage = Image(systemName: MOONFILL)
                 let sunText = Text("\(sunImage) \(day)")        // verbatim: doesn't work here, will not show the image. Thus we must set this to "Don't translate"
                 let moonText = Text("\(moonImage) \(month)")    //   "
                 if common.isIncoming {
                     let sizeIndex = sizeIn(for: amount.value)
                     VStack {
                         sunText
                         moonText
                         Image("River-Lake-" + String(sizeIndex))
                             .resizable()
                             .scaledToFit()
                             .onTapGesture { selectTX() }
                             .background { background }
                     }
                 } else if common.isOutgoing {
                     let sizeIndex = sizeOut(for: amount.value)
                     VStack {
                         sunText
                         moonText
                         Image("River-Pond-" + String(sizeIndex))
                             .resizable()
                             .scaledToFit()
                             .onTapGesture { selectTX() }
                             .background { background }
                     }
                 }
                 if historyItem.marker != .none {
                     let markerIndex = historyItem.marker.rawValue
                     VStack {
                         Text(verbatim: " ")
                         Text(verbatim: " ")
                         Image("River-Mark-" + String(markerIndex))
                             .resizable()
                             .scaledToFit()
                             .background { background2 }
                             .overlay {
                                 LinearGradient(colors: [.clear, .black, .clear], startPoint: .leading, endPoint: .trailing)
                                     .opacity(0.5)
                             }
                     }
                 }
             } else {
                 let _ = print("no talerTX")
             }
         } else {
             let _ = print("no historyItem")
         }
         //.border(.green)
         //.border(.blue)
     }
 }