//
//  DataController.swift
//  Leganto
//
//  Created by Louis Hollingworth on 2023-05-21.
//

import CoreData

class DataController: ObservableObject {
    static let shared = DataController()
    
    static var preview: DataController {
        let result = DataController(inMemory: true)
        let viewContext = result.container.viewContext
        
        for i in 0..<3 {
            for j in 1...3 {
                let newFeed = Feed(context: viewContext)
                switch i {
                case 2:
                    newFeed.genre = Genre.technology.rawValue
                    break
                case 3:
                    newFeed.genre = Genre.news.rawValue
                    break
                default:
                    newFeed.genre = Genre.uncategorised.rawValue
                    break
                }
            
                newFeed.name = "\(i+j)"
                newFeed.dateAdded = Date()
                newFeed.dateUpdated = Date()
                newFeed.desc = "\(i+j)"
                newFeed.url = "https://git.ludoviko.ch/lucxjo/leganto.rss"
            }
        }
        
        do {
            try viewContext.save()
        } catch {
            let nsError = error as NSError
            fatalError("Unresolved error \(nsError), \(nsError.userInfo)")

        }
        
        return result
    }
    
    let container: NSPersistentCloudKitContainer
    
    init(inMemory: Bool = false) {
        container = NSPersistentCloudKitContainer(name: "Leganto")
        if inMemory {
            container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
        }

        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.

                /*
                    Typical reasons for an error here include:
                    * The parent directory does not exist, cannot be created, or disallows writing.
                    * The persistent store is not accessible, due to permissions or data protection when the device is locked.
                    * The device is out of space.
                    * The store could not be migrated to the current model version.
                    Check the error message to determine what the actual problem was.
                */
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        
        container.viewContext.automaticallyMergesChangesFromParent = true
    }
}