//
//  DoughnutChartView.swift
//  MVMCoreUI
//
//  Created by Murugan, Vimal on 26/12/19.
//  Copyright © 2019 Verizon Wireless. All rights reserved.
//

import Foundation

@objcMembers open class DoughnutChartView: View {
    
    var doughnutChart = DoughnutChart(frame: CGRect.zero)
    var colorLablesStack = ColorViewLabelsStack()
    var container = MVMCoreUICommonViewsUtility.commonView()
    var doughnutChartModel: DoughnutChartModel? {
       get { return model as? DoughnutChartModel }
    }
    
    open override func setupView() {
        super.setupView()
        guard container.superview == nil else {
            return
        }
        
        addSubview(container)
        doughnutChart.translatesAutoresizingMaskIntoConstraints = false
        container.addSubview(doughnutChart)
        colorLablesStack.translatesAutoresizingMaskIntoConstraints = false
        container.addSubview(colorLablesStack)
        
        NSLayoutConstraint.constraintPinSubview(container, pinTop: true, pinBottom: true, pinLeft: true, pinRight: true)
        doughnutChart.leadingAnchor.constraint(equalTo: container.leadingAnchor).isActive = true
        doughnutChart.topAnchor.constraint(equalTo: container.topAnchor, constant: PaddingFour).isActive = true
        container.bottomAnchor.constraint(greaterThanOrEqualTo: doughnutChart.bottomAnchor).isActive = true
        
        let containerBottomAnchor = container.bottomAnchor.constraint(equalTo: doughnutChart.bottomAnchor)
        containerBottomAnchor.priority = UILayoutPriority(rawValue: 200)
        containerBottomAnchor.isActive = true
        
        let colorLablesBottomAnchor = container.bottomAnchor.constraint(equalTo: colorLablesStack.bottomAnchor)
        colorLablesBottomAnchor.priority = UILayoutPriority(rawValue: 204)
        colorLablesBottomAnchor.isActive = true
        
        let colorLablesTopAnchor = colorLablesStack.topAnchor.constraint(equalTo: doughnutChart.topAnchor)
        colorLablesTopAnchor.priority = UILayoutPriority(rawValue: 204)
        colorLablesTopAnchor.isActive = true
        
        colorLablesStack.topAnchor.constraint(greaterThanOrEqualTo: doughnutChart.topAnchor).isActive = true
        container.bottomAnchor.constraint(greaterThanOrEqualTo: colorLablesStack.bottomAnchor).isActive = true
        container.trailingAnchor.constraint(greaterThanOrEqualTo: colorLablesStack.trailingAnchor).isActive = true
        
        let centerY = colorLablesStack.centerYAnchor.constraint(equalTo: doughnutChart.centerYAnchor)
        centerY.priority = .defaultLow
        centerY.isActive = true
        
        colorLablesStack.leadingAnchor.constraint(equalTo: doughnutChart.trailingAnchor, constant: PaddingThree).isActive = true
        colorLablesStack.backgroundColor = UIColor.clear
        
    }
    
    open override func updateView(_ size: CGFloat) {
        super.updateView(size)
        doughnutChart.updateView(size)
        colorLablesStack.updateView(size)
    }
    
    open override func reset() {
        super.reset()
        colorLablesStack.reset()
    }
    
    open override func setWithModel(_ model: MoleculeProtocol?, _ delegateObject: MVMCoreUIDelegateObject?, _ additionalData: [AnyHashable : Any]?) {
        super.setWithModel(model, delegateObject, additionalData)
        doughnutChart.clearLayers()
        colorLablesStack.removeAllItemViews()
        doughnutChart.setWithModel(model, delegateObject, additionalData)
        colorLablesStack.setWithModel(model, delegateObject, additionalData)
    }
    
    open override func setWithJSON(_ json: [AnyHashable : Any]?, delegateObject: MVMCoreUIDelegateObject?, additionalData: [AnyHashable : Any]?) {
        if model == nil {
            let data = try! JSONSerialization.data(withJSONObject: json!)
            let decoder = JSONDecoder()
            let model = try! decoder.decode(DoughnutChartModel.self, from: data)
            setWithModel(model, delegateObject, additionalData as? [String : AnyHashable])
        } else {
            setWithModel(model, delegateObject, additionalData as? [String : AnyHashable])
        }
    }
    
}

class ColorViewLabelsStack: MoleculeStackView {
    
    var dougnutChartModel: DoughnutChartModel?
    override func setWithModel(_ model: MoleculeProtocol?, _ delegateObject: MVMCoreUIDelegateObject?, _ additionalData: [AnyHashable : Any]?) {
        let previousModel = self.dougnutChartModel
        removeAllItemViews()
        guard let dougnutChartModel = model as? DoughnutChartModel else {
            return
        }
        var items: [StackItem]?
        if previousModel?.sections.count == dougnutChartModel.sections.count {
            items = stackItems
        }
        stackItems = []
        self.model = MoleculeStackModel(molecules: [])
        for (index, chartItemModel) in dougnutChartModel.sections.enumerated() {
            let colorViewWithLabel = items?[index].view as? ColorViewWithLabel ?? ColorViewWithLabel()
            colorViewWithLabel.setWithModel(chartItemModel, delegateObject, additionalData)
            addView(colorViewWithLabel, lastItem: index == dougnutChartModel.sections.count - 1)
        }
        self.dougnutChartModel = dougnutChartModel
        restack()
    }
}

class ColorViewWithLabel: View, MVMCoreUIViewConstrainingProtocol {
    
    var label = Label.commonLabelB2(true)
    var colorView = MVMCoreUICommonViewsUtility.commonView()
    private var sizeObject = MFStyler.sizeObjectGeneric(forCurrentDevice: 8)!
    var heightConstraint: NSLayoutConstraint?
    
    override func setupView() {
        super.setupView()
        guard colorView.superview == nil else {
            return
        }
        translatesAutoresizingMaskIntoConstraints = false
        addSubview(colorView)
        addSubview(label)
        
        heightConstraint = colorView.heightAnchor.constraint(equalToConstant: sizeObject.getValueBasedOnApplicationWidth())
        heightConstraint?.isActive = true
        colorView.widthAnchor.constraint(equalTo: colorView.heightAnchor).isActive = true
        colorView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
        colorView.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
        
        label.leadingAnchor.constraint(equalTo: colorView.trailingAnchor, constant: PaddingOne).isActive = true
        label.topAnchor.constraint(equalTo: topAnchor).isActive = true
        trailingAnchor.constraint(greaterThanOrEqualTo: label.trailingAnchor).isActive = true
        bottomAnchor.constraint(equalTo: label.bottomAnchor).isActive = true
        
    }
    
    override func updateView(_ size: CGFloat) {
        super.updateView(size)
        label.updateView(size)
        heightConstraint?.constant = sizeObject.getValueBased(onSize: size)
        setNeedsDisplay()
    }
    
    override func reset() {
        super.reset()
        label.reset()
    }
    
    override func setAsMolecule() {
        label.setAsMolecule()
    }
    
    override func setWithModel(_ model: MoleculeProtocol?, _ delegateObject: MVMCoreUIDelegateObject?, _ additionalData: [AnyHashable : Any]?) {
        super.setWithModel(model, delegateObject, additionalData)
        guard let chartItemModel = model as? ChartItemModel else {
            return
        }
        label.setWithModel(chartItemModel.label, delegateObject, additionalData)
        colorView.backgroundColor = UIColor.mfGet(forHex: chartItemModel.color)
    }
    
}