//
//  Preferences.swift
//  Gemini-iOS
//
//  Created by Shadowfacts on 9/27/20.
//

import UIKit

class Preferences: Codable, ObservableObject {
    
    static let shared: Preferences = load()
    
    private static var documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    private static var archiveURL = Preferences.documentsDirectory.appendingPathComponent("Preferences").appendingPathExtension("plist")
    
    static func save() {
        let encoder = PropertyListEncoder()
        let data = try? encoder.encode(shared)
        try? data?.write(to: archiveURL, options: .noFileProtection)
    }
    
    static func load() -> Preferences {
        let decoder = PropertyListDecoder()
        if let data = try? Data(contentsOf: archiveURL),
           let prefs = try? decoder.decode(Preferences.self, from: data) {
            return prefs
        }
        return Preferences()
    }
    
    private init() {}
    
    required init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        
        if let stored = try container.decodeIfPresent(URL.self, forKey: .homepage) {
            homepage = stored
        }
        
        theme = try container.decode(UIUserInterfaceStyle.self, forKey: .theme)
        if let stored = try container.decodeIfPresent(Bool.self, forKey: .showLinkIcons) {
            showLinkIcons = stored
        }
        
        useInAppSafari = try container.decode(Bool.self, forKey: .useInAppSafari)
        useReaderMode = try container.decode(Bool.self, forKey: .useReaderMode)
        
        if let stored = try container.decodeIfPresent(Bool.self, forKey: .hideToolbarsWhenScrolling) {
            hideToolbarsWhenScrolling = stored
        }
        if let stored = try container.decodeIfPresent(Bool.self, forKey: .pullToRefreshEnabled) {
            pullToRefreshEnabled = stored
        }
        
        if let stored = try container.decodeIfPresent([ToolbarItem].self, forKey: .toolbar) {
            toolbar = stored
        }
    }
    
    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)
        
        try container.encode(homepage, forKey: .homepage)
        
        try container.encode(theme, forKey: .theme)
        try container.encode(showLinkIcons, forKey: .showLinkIcons)
        
        try container.encode(useInAppSafari, forKey: .useInAppSafari)
        try container.encode(useReaderMode, forKey: .useReaderMode)
        
        try container.encode(hideToolbarsWhenScrolling, forKey: .hideToolbarsWhenScrolling)
        try container.encode(pullToRefreshEnabled, forKey: .pullToRefreshEnabled)
        
        try container.encode(toolbar, forKey: .toolbar)
    }
    
    @Published var homepage = AppDelegate.defaultHomepage
    
    @Published var theme = UIUserInterfaceStyle.unspecified
    @Published var showLinkIcons = true
    
    @Published var useInAppSafari = false
    @Published var useReaderMode = false
    
    @Published var hideToolbarsWhenScrolling = true
    @Published var pullToRefreshEnabled = true
    
    @Published var toolbar: [ToolbarItem] = [.back, .forward, .reload, .tableOfContents, .share, .preferences]
    
    enum CodingKeys: String, CodingKey {
        case homepage
        
        case theme
        case showLinkIcons
        
        case useInAppSafari
        case useReaderMode
        
        case hideToolbarsWhenScrolling
        case pullToRefreshEnabled
        
        case toolbar
    }
    
}


extension UIUserInterfaceStyle: Codable {}