//
//  App.swift
//  AltStore
//
//  Created by Riley Testut on 5/20/19.
//  Copyright © 2019 Riley Testut. All rights reserved.
//

import Foundation
import CoreData

import Roxas

extension App
{
    static let altstoreAppID = "com.rileytestut.AltStore"
}

@objc(App)
class App: NSManagedObject, Decodable, Fetchable
{
    /* Properties */
    @NSManaged private(set) var name: String
    @NSManaged private(set) var identifier: String
    @NSManaged private(set) var subtitle: String?
    
    @NSManaged private(set) var developerName: String
    @NSManaged private(set) var localizedDescription: String
    
    @NSManaged private(set) var iconName: String
    @NSManaged private(set) var screenshotNames: [String]
    
    @NSManaged var version: String
    @NSManaged private(set) var versionDate: Date
    @NSManaged private(set) var versionDescription: String?
    
    @NSManaged private(set) var downloadURL: URL
    @NSManaged private(set) var tintColor: UIColor?
    
    /* Relationships */
    @NSManaged private(set) var installedApp: InstalledApp?
    @objc(permissions) @NSManaged var _permissions: NSOrderedSet
    
    @nonobjc var permissions: [AppPermission] {
        return self._permissions.array as! [AppPermission]
    }
    
    private override init(entity: NSEntityDescription, insertInto context: NSManagedObjectContext?)
    {
        super.init(entity: entity, insertInto: context)
    }
    
    private enum CodingKeys: String, CodingKey
    {
        case name
        case identifier
        case developerName
        case localizedDescription
        case version
        case versionDescription
        case versionDate
        case iconName
        case screenshotNames
        case downloadURL
        case tintColor
        case subtitle
        case permissions
    }
    
    required init(from decoder: Decoder) throws
    {
        guard let context = decoder.managedObjectContext else { preconditionFailure("Decoder must have non-nil NSManagedObjectContext.") }
        
        super.init(entity: App.entity(), insertInto: nil)
        
        let container = try decoder.container(keyedBy: CodingKeys.self)
        self.name = try container.decode(String.self, forKey: .name)
        self.identifier = try container.decode(String.self, forKey: .identifier)
        self.developerName = try container.decode(String.self, forKey: .developerName)
        self.localizedDescription = try container.decode(String.self, forKey: .localizedDescription)
        
        self.subtitle = try container.decodeIfPresent(String.self, forKey: .subtitle)
        
        self.version = try container.decode(String.self, forKey: .version)
        self.versionDate = try container.decode(Date.self, forKey: .versionDate)
        self.versionDescription = try container.decodeIfPresent(String.self, forKey: .versionDescription)
        
        self.iconName = try container.decode(String.self, forKey: .iconName)
        self.screenshotNames = try container.decodeIfPresent([String].self, forKey: .screenshotNames) ?? []
        
        self.downloadURL = try container.decode(URL.self, forKey: .downloadURL)
        
        if let tintColorHex = try container.decodeIfPresent(String.self, forKey: .tintColor)
        {
            guard let tintColor = UIColor(hexString: tintColorHex) else {
                throw DecodingError.dataCorruptedError(forKey: .tintColor, in: container, debugDescription: "Hex code is invalid.")
            }
            
            self.tintColor = tintColor
        }
        
        let permissions = try container.decodeIfPresent([AppPermission].self, forKey: .permissions) ?? []
        
        context.insert(self)
        
        // Must assign after we're inserted into context.
        self._permissions = NSOrderedSet(array: permissions)
    }
}

extension App
{
    @nonobjc class func fetchRequest() -> NSFetchRequest<App>
    {
        return NSFetchRequest<App>(entityName: "App")
    }
    
    class func makeAltStoreApp(in context: NSManagedObjectContext) -> App
    {
        let app = App(context: context)
        app.name = "AltStore"
        app.identifier = "com.rileytestut.AltStore"
        app.developerName = "Riley Testut"
        app.localizedDescription = "AltStore is an alternative App Store."
        app.iconName = ""
        app.screenshotNames = []
        app.version = "1.0"
        app.versionDate = Date()
        app.downloadURL = URL(string: "http://rileytestut.com")!
        
        return app
    }
}