//
//  KHFileStorageView.swift
//  Free Space
//
//  Created by Kyle Howells on 05/05/2022.
//

import Foundation
import UIKit

class KHFileStorageView: UIView {
	
	// MARK: - Properties
	
	var totalSpace:Int64 = 100 {
		didSet {
			self.update()
		}
	}
	var usedSpace:Int64 = 50 {
		didSet {
			self.update()
		}
	}
	
	
	let byteFormatter:ByteCountFormatter = {
		let formatter = ByteCountFormatter()
		formatter.allowedUnits = .useAll
		formatter.countStyle = .file
		formatter.includesUnit = true
		formatter.isAdaptive = true
		return formatter
	}()
	
	
	// MARK: - Views
	
	let usedBackgroundView:UIView = {
		let view = UIView()
		view.backgroundColor = UIColor(red: 44.0/255.0, green: 67.0/255.0, blue: 136.0/255.0, alpha: 1.0)
		return view
	}()
	
	let usedSpaceLabel:UILabel = {
		let l = UILabel()
		l.textColor = UIColor(red: 44.0/255.0, green: 67.0/255.0, blue: 136.0/255.0, alpha: 1.0)
		l.font = UIFont.systemFont(ofSize: 13, weight: .medium)
		return l
	}()
	
	
	let freeBackgroundView:UIView = {
		let view = UIView()
		view.backgroundColor = UIColor(red: 206.0/255.0, green: 206.0/255.0, blue: 207.0/255.0, alpha: 1.0)
		return view
	}()
	
	let freeSpaceLabel:UILabel = {
		let l = UILabel()
		l.textColor = UIColor(red: 206.0/255.0, green: 206.0/255.0, blue: 207.0/255.0, alpha: 1.0)
		l.font = UIFont.systemFont(ofSize: 13, weight: .medium)
		return l
	}()
	
	
	// MARK: - Setup
	
	override init(frame: CGRect) {
		super.init(frame: frame)
		self.commonInit()
	}
	
	required init?(coder: NSCoder) {
		super.init(coder: coder)
		self.commonInit()
	}
	
	func commonInit() {
		self.addSubview(self.freeSpaceLabel)
		self.addSubview(self.freeBackgroundView)
		
		self.addSubview(self.usedSpaceLabel)
		self.addSubview(self.usedBackgroundView)
	}
	
	
	private func update() {
		let usedSpaceString = self.byteFormatter.string(fromByteCount: self.usedSpace)
		self.usedSpaceLabel.text = "Used: \(usedSpaceString)"
		
		let freeSpaceString = self.byteFormatter.string(fromByteCount: self.totalSpace - self.usedSpace)
		self.freeSpaceLabel.text = "Free: \(freeSpaceString)"
		
		self.setNeedsLayout()
	}
	
	
	// MARK: - Size
	
	private let barHeight:CGFloat = 30
	
	override func sizeThatFits(_ size: CGSize) -> CGSize {
		return CGSize(width: size.width, height: self.barHeight + self.freeSpaceLabel.font.lineHeight)
	}
	
	override var intrinsicContentSize: CGSize {
		return CGSize(
			width: 320,
			height: self.barHeight + self.freeSpaceLabel.font.lineHeight
		)
	}
	
	
	// MARK: - Layout
	
	override func layoutSubviews() {
		super.layoutSubviews()
		let size = self.bounds.size
		
		let usedPercent = CGFloat(self.usedSpace) / CGFloat(self.totalSpace)
		let usedSpaceWidth = size.width * usedPercent
		
		self.usedBackgroundView.frame = {
			var frame = CGRect()
			frame.size.width = usedSpaceWidth
			frame.size.height = self.barHeight
			frame.origin.x = 0
			frame.origin.y = 0
			return frame
		}()
		
		self.usedSpaceLabel.frame = {
			var frame = CGRect()
			frame.size = self.usedSpaceLabel.intrinsicContentSize
			
			frame.origin.x = 0
			frame.origin.y = self.usedBackgroundView.frame.maxY
			return frame
		}()
		
		
		let freePercent = CGFloat(self.totalSpace - self.usedSpace) / CGFloat(self.totalSpace)
		let freeSpaceWidth = size.width * freePercent
		
		self.freeBackgroundView.frame = {
			var frame = CGRect()
			frame.size.width = freeSpaceWidth
			frame.size.height = self.barHeight
			frame.origin.x = size.width - frame.width
			frame.origin.y = 0
			return frame
		}()
		
		self.freeSpaceLabel.frame = {
			var frame = CGRect()
			frame.size = self.freeSpaceLabel.intrinsicContentSize
			
			frame.origin.x = size.width - frame.width
			frame.origin.y = self.freeBackgroundView.frame.maxY
			return frame
		}()
		
	}
	
}