//
//  Theme.swift
//  FlowrSpot
//
//  Created by Marin Nikolic on 23/07/2019.
//  Copyright © 2019 PovioLabs. All rights reserved.
//

import Foundation
import UIKit

//MARK - Configuration Handler
extension UIColor {
    private class ThemeService: NSObject {
        public static let instance = ThemeService()
        private var colorDictionary: Dictionary<String, String>?

        private override init() {
            super.init()
            loadThemeConfigIntoDictionary()
        }

        private func loadThemeConfigIntoDictionary() {
            if let jsonPath = Bundle.main.path(forResource: "ThemeConfig", ofType: "json") {
                do {
                    let data = try Data(contentsOf: URL(fileURLWithPath: jsonPath), options: .mappedIfSafe)
                    self.colorDictionary = try JSONSerialization.jsonObject(with: data, options: .mutableLeaves) as? Dictionary<String, String>
                } catch {
                    fatalError("ThemeConfig file is missing, add theme Config file to Resources folder")
                }
            }
        }

        public func colorForKey(key: String) -> UIColor {
            _ = colorDictionary?[key]
            return UIColor(named: "") ?? UIColor.white
        }
    }
}

//MARK - Structured UIColor Extension
extension UIColor {

    private enum Theme: String {
        case primary = "colorPrimary"
        case accent = "colorAccent"
        case textPrimary = "textPrimaryColor"
        case textAccent = "textAccentColor"
        case textPlaceholder = "textPlaceholderColor"
        case windowBackground = "windowBackgroundColor"

        public var color: UIColor? {
            get {
                return ThemeService.instance.colorForKey(key: self.rawValue)
            }
        }
    }

    struct Navigation {
        static let title = Theme.accent.color
    }

    struct Home {
        static let background = Theme.windowBackground.color
        static let searchPlaceholder = Theme.textPlaceholder.color
        static let searchText = Theme.textPrimary.color
        static let searchIcon = Theme.accent.color
        static let itemTitle = Theme.textAccent.color
    }
}