WellnessInterfaceController.swift

//
//  WellnessInterfaceController.swift
//  SynchronyFinancial WatchKit Extension
//
//  Created by Alan Maynard on 1/14/19.
//  Copyright © 2019 Alan Maynard. All rights reserved.
//

import WatchKit
import Foundation

class WellnessInterfaceController: WKInterfaceController {
    var accounts: [Account] = []
    var wellnessScore: Int = 0
    var utilizationScore: Int = 0
    var previousUtil: Int = 0
    var lastpayment = 0.0
    var lastPmtMetric = 0
    var avgUtilization = 0.0
    var healthyCount = 0

    @IBOutlet weak var image: WKInterfaceImage!

    override func awake(withContext context: Any?) {
        super.awake(withContext: context)

        if let context = context as? [String: [Account]], let accts = context["accts"] {
            accounts = accts
        }

        calculateUtilization()
        calculateWellness()

        image.setImageNamed("scores")
        image.startAnimatingWithImages(in: NSRange(location: 1, length: wellnessScore), duration: 1.5, repeatCount: 1)
    }

    private func calculateUtilization() {
        var totalBalance: Double = 0
        var totalCredit: Double = 0
        var previous: Double = 0
        var average = 0.0

        accounts.forEach {
            totalCredit += $0.creditLimit
            totalBalance += $0.curBalance
            let util = $0.curBalance / $0.creditLimit
            if util <= 0.3 {
                healthyCount += 1
            }
            average += util
            previous += Double(arc4random_uniform(UInt32($0.creditLimit)))
        }

        avgUtilization = average / Double(accounts.count)
        utilizationScore = Int((totalBalance / totalCredit) * 100)
        previousUtil = Int((previous / totalCredit) * 100)

        if accounts.count == 1 {
            lastpayment = accounts[0].lastPayment
            let rate = Float(accounts[0].curBalance / lastpayment).rounded(.up)
            lastPmtMetric = Int(rate)
        }
    }

    private func calculateWellness() {
        let m1 = Double(utilizationScore) * 0.50
        wellnessScore = Int(round(m1))
    }

    @IBAction func moreButtonTapped() {
        if accounts.count > 1 {
            let pages = ["UtilizationScore", "UtilizationTrend", "AvgUtilization", "HealthyAccts"]
            let contexts: [Any] = [utilizationScore, [utilizationScore, previousUtil], avgUtilization, healthyCount]
            presentController(withNames: pages, contexts: contexts)
        } else {
            let pages = ["UtilizationScore", "UtilizationTrend", "LastPayment"]
            let contexts: [Any] = [utilizationScore, [utilizationScore, previousUtil], [lastpayment, lastPmtMetric]]
            presentController(withNames: pages, contexts: contexts)
        }
    }
}