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ViewController.swift

import UIKit
import SwiftCharts

// NOTE: you may have to set the module in the storyboard to "SwiftCharts", otherwise the view may not be recognized correctly, which leads to axis, labels and guidelines not showing

class AnalysisController: UIViewController {
    
    let monthData: [Int: [String: Float]] = [0: ["Jan": 20],
                                             1: ["Feb": 4],
                                             2: ["Mar": 20],
                                             3: ["Apr": 83],
                                             4: ["May": 750],
                                             5: ["Jun": 400],
                                             6: ["Jul": 300],
                                             7: ["Aug": 49],
                                             8: ["Sep": 400],
                                             9: ["Oct": 49],
                                             10: ["Nov": 39],
                                             11: ["Dec": 10]
    ]
    
    private var chart: Chart?
    
    private var didLayout: Bool = false
    
    let backgroundView: UIView = {
        let view = UIView()
        view.backgroundColor = .white
        view.translatesAutoresizingMaskIntoConstraints = false
        view.layer.masksToBounds =  false
        view.layer.shadowOpacity = 0.23
        view.layer.shadowColor = UIColor(hex: "B1B2B3").cgColor
        view.layer.shadowRadius = 4 // blur
        view.layer.shadowOffset = CGSize(width: 0, height: 2) // Spread
        return view
    }()
    
    let monthlyTotalView: MonthlySpendingView = {
        let view = MonthlySpendingView()
        return view
    }()
    
    fileprivate var chartView: ChartBaseView = {
        let view = ChartBaseView()
        view.backgroundColor = .clear
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()
    
    //let currencyTextField = TSCurrencyTextField()
    
    var counter = 0
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        if counter < 2 {
            self.initChart()
            self.setupMonthlySpendingView()
            
            //chart?.zoom(scaleX: 2.4, scaleY: 1)
            chart?.zoom(scaleX: 2.4, scaleY: 5, anchorX: 0, anchorY: 0)
            counter += 1
        }
    }
    
    private func getMonthData() -> [MonthData] {
        var items = [MonthData]()
        for (index, data) in monthData {
            for (monthName, expenses) in data {
                let monthData = MonthData(index: index, monthName: monthName, expenses: expenses)
                items.append(monthData)
            }
        }
        return items.sorted(by: {$0.index < $1.index})
    }
    
    private func initChart() {
        self.setupChartPosition()
        
        // map model data to chart points
        let xLabelSettings = ChartLabelSettings(font: ExamplesDefaults.labelFont, fontColor: ExamplesDefaults.labelTextColor, rotation: 0, rotationKeep: .top, shiftXOnRotation: false, textAlignment: .default)
        let yLabelSettings = ChartLabelSettings(font: ExamplesDefaults.semiBoldFont, fontColor: ExamplesDefaults.labelTextColor, rotation: 0, rotationKeep: .center, shiftXOnRotation: false, textAlignment: .default)
        
        let chartPoints: [ChartPoint] = getMonthData().enumerated().map {index, item in
            let x = ChartAxisValueString(item.monthName, order: index, labelSettings: xLabelSettings)
            
            let y = ChartAxisValueString("", order: Int(item.expenses), labelSettings: yLabelSettings)
            return ChartPoint(x: x, y: y)
        }
        
        let labelSettings = ChartLabelSettings(font: ExamplesDefaults.labelFont, fontColor: ExamplesDefaults.labelTextColor, rotation: 0, rotationKeep: .center, shiftXOnRotation: false, textAlignment: .default)
        
        // define x and y axis values (quick-demo way, see other examples for generation based on chartpoints)
        let xValues = getMonthData().enumerated().map {index, item -> ChartAxisValueString in
            return ChartAxisValueString(item.monthName, order: index, labelSettings: labelSettings)
        }
        
        let yValues = stride(from: 0, through: 5000, by: 200).map { (integer) -> ChartAxisValueString in
            return ChartAxisValueString("$\(integer)", order: integer, labelSettings: labelSettings)
        }

        // create axis
        //with axis values and axis title
        //let xModel = ChartAxisModel(axisValues: xValues, lineColor: .clear, axisTitleLabel: ChartAxisLabel(text: "", settings: labelSettings))
        
        let xModel = ChartAxisModel(axisValues: xValues, lineColor: .clear, axisTitleLabel: ChartAxisLabel(text: "", settings: labelSettings.defaultVertical()))
        let yModel = ChartAxisModel(axisValues: yValues, lineColor: .clear, axisTitleLabel: ChartAxisLabel(text: "", settings: labelSettings.defaultVertical()))
        

        //let yModel = ChartAxisModel(axisValues: yValues, lineColor: .clear, axisTitleLabel: ChartAxisLabel(text: "", settings: labelSettings.defaultVertical()))
        
        let chartFrame = self.chartView.frame
        
        // generate axes layers and calculate chart inner frame, based on the axis models
        let coordsSpace = ChartCoordsSpaceLeftBottomSingleAxis(chartSettings: ExamplesDefaults.chartSettings, chartFrame: chartFrame, xModel: xModel, yModel: yModel)
        let (xAxis, yAxis, innerFrame) = (coordsSpace.xAxisLayer, coordsSpace.yAxisLayer, coordsSpace.chartInnerFrame)
        
        // create layer with guidelines
        let guidelinesLayerSettings = ChartGuideLinesLayerSettings(linesColor: ExamplesDefaults.guidelinesColor, linesWidth: ExamplesDefaults.guidelinesWidth)
        
        let guidelinesLayer = ChartGuideLinesLayer(xAxisLayer: xAxis, yAxisLayer: yAxis, settings: guidelinesLayerSettings)
        
        // view generator - this is a function that creates a view for each chartpoint
        let barViewGenerator = {(chartPointModel: ChartPointLayerModel, layer: ChartPointsViewsLayer, chart: Chart) -> UIView? in
            
            let bottomLeft = layer.modelLocToScreenLoc(x: 0, y: 0)

            let barWidth: CGFloat = Env.iPad ? 20 : 19
            
            let settings = ChartBarViewSettings(animDuration: 0.5)
            
            let (p1, p2): (CGPoint, CGPoint) = {
                return (CGPoint(x: chartPointModel.screenLoc.x, y: bottomLeft.y), CGPoint(x: chartPointModel.screenLoc.x, y: chartPointModel.screenLoc.y))
            }()
            
    let viewBar = ChartPointViewBar(p1: p1, p2: p2, width: barWidth, bgColor: #colorLiteral(red: 0.1725490196, green: 0.6509803922, blue: 1, alpha: 1), settings: settings)
    print("viewBar frame", viewBar.frame)

    let mGradient = CAGradientLayer()
    mGradient.frame = viewBar.bounds
    var colors = [CGColor]()
    colors.append(UIColor(red: 0, green: 0, blue: 0, alpha: 1).cgColor)
    colors.append(UIColor(red: 0, green: 0, blue: 0, alpha: 0).cgColor)

    mGradient.startPoint = CGPoint(x: 0.1, y: 0.5)
    mGradient.endPoint = CGPoint(x: 0.9, y: 0.5)
    mGradient.colors = colors

    viewBar.layer.addSublayer(mGradient)
            
            viewBar.layer.masksToBounds =  false
            viewBar.layer.shadowOpacity = 0.2
            viewBar.layer.shadowColor = #colorLiteral(red: 0.1725490196, green: 0.6509803922, blue: 1, alpha: 1).cgColor
            viewBar.layer.shadowRadius = 4 // blur
            viewBar.layer.shadowOffset = CGSize(width: 0, height: 2) // Spread
            return viewBar
        }
        
        // create layer that uses viewGenerator to display chartpoints
        let chartPointsLayer = ChartPointsViewsLayer(xAxis: xAxis.axis, yAxis: yAxis.axis, chartPoints: chartPoints, viewGenerator: barViewGenerator)
        
        let chartSettings = ExamplesDefaults.chartSettingsWithPanZoom
        
        // create chart instance with frame and layers
        let chart = Chart(view: self.chartView, innerFrame: innerFrame, settings: chartSettings, layers: [
            coordsSpace.xAxisLayer,
            coordsSpace.yAxisLayer,
            guidelinesLayer,
            chartPointsLayer
            ])
        self.chart = chart
    }
        
    func rotated() {
        for view in self.chartView.subviews {
            view.removeFromSuperview()
        }
        self.initChart()
    }
}

// MARK: - Actions
extension AnalysisController {
    internal func updateMonthlyCost() {
        APIService.sharedInstance.userMonthlySpendings { (cost) in
            self.monthlyTotalView.setCostLabelValue(cost: cost)
        }
    }
}

// MARK: - Setup
extension AnalysisController {
    internal func setupChartPosition() {
        self.view.addSubview(self.backgroundView)
        self.backgroundView.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
        self.backgroundView.rightAnchor.constraint(equalTo: self.view.rightAnchor).isActive = true
        self.backgroundView.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
        self.backgroundView.heightAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 0.74).isActive = true
        
        self.backgroundView.addSubview(self.chartView)
        self.chartView.topAnchor.constraint(equalTo: self.backgroundView.topAnchor).isActive = true
        self.chartView.bottomAnchor.constraint(equalTo: self.backgroundView.bottomAnchor).isActive = true
        self.chartView.widthAnchor.constraint(equalTo: self.backgroundView.widthAnchor, multiplier: 1).isActive = true // 1
        self.chartView.centerXAnchor.constraint(equalTo: self.backgroundView.centerXAnchor, constant: -15).isActive = true
    }
    
    internal func setupMonthlySpendingView() {
        self.view.addSubview(self.monthlyTotalView)
        self.monthlyTotalView.topAnchor.constraint(equalTo: self.backgroundView.bottomAnchor, constant: 15).isActive = true
        self.monthlyTotalView.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: -7).isActive = true
        self.monthlyTotalView.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 7).isActive = true
        self.monthlyTotalView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: -60).isActive = true
        
        self.updateMonthlyCost()
    }
}