//
//  WidgetDataEncoder.swift
//  NetNewsWire
//
//  Created by Stuart Breckenridge on 18/11/20.
//  Copyright © 2020 Ranchero Software. All rights reserved.
//

import Foundation
import WidgetKit
import os.log
import UIKit
import Articles
import Account


public final class WidgetDataEncoder {
	
	private let log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "Application")
	private let fetchLimit = 7
	
	private var backgroundTaskID: UIBackgroundTaskIdentifier!
	private lazy var appGroup = Bundle.main.object(forInfoDictionaryKey: "AppGroup") as! String
	private lazy var containerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroup)
	private lazy var dataURL = containerURL?.appendingPathComponent("widget-data.json")
	
	static let shared = WidgetDataEncoder()
	private init () {}
	
	func encodeWidgetData() throws {
		os_log(.debug, log: log, "Starting encoding widget data.")
		
//		do {
//			let unreadArticles = Array(try AccountManager.shared.fetchArticles(fetchType: .unread(fetchLimit))).sortedByDate(.orderedDescending)
//			let starredArticles = Array(try AccountManager.shared.fetchArticles(fetchType: .starred(fetchLimit))).sortedByDate(.orderedDescending)
//			let todayArticles = Array(try AccountManager.shared.fetchArticles(fetchType: .today(fetchLimit))).sortedByDate(.orderedDescending)
//			
//			var unread = [LatestArticle]()
//			var today = [LatestArticle]()
//			var starred = [LatestArticle]()
//			
//			for article in unreadArticles {
//				let latestArticle = LatestArticle(id: article.sortableArticleID,
//												  feedTitle: article.sortableName,
//												  articleTitle: ArticleStringFormatter.truncatedTitle(article).isEmpty ? ArticleStringFormatter.truncatedSummary(article) : ArticleStringFormatter.truncatedTitle(article),
//												  articleSummary: article.summary,
//												  feedIcon: article.iconImage()?.image.dataRepresentation(),
//												  pubDate: article.datePublished?.description ?? "")
//				unread.append(latestArticle)
//			}
//			
//			for article in starredArticles {
//				let latestArticle = LatestArticle(id: article.sortableArticleID,
//												  feedTitle: article.sortableName,
//												  articleTitle: ArticleStringFormatter.truncatedTitle(article).isEmpty ? ArticleStringFormatter.truncatedSummary(article) : ArticleStringFormatter.truncatedTitle(article),
//												  articleSummary: article.summary,
//												  feedIcon: article.iconImage()?.image.dataRepresentation(),
//												  pubDate: article.datePublished?.description ?? "")
//				starred.append(latestArticle)
//			}
//			
//			for article in todayArticles {
//				let latestArticle = LatestArticle(id: article.sortableArticleID,
//												  feedTitle: article.sortableName,
//												  articleTitle: ArticleStringFormatter.truncatedTitle(article).isEmpty ? ArticleStringFormatter.truncatedSummary(article) : ArticleStringFormatter.truncatedTitle(article),
//												  articleSummary: article.summary,
//												  feedIcon: article.iconImage()?.image.dataRepresentation(),
//												  pubDate: article.datePublished?.description ?? "")
//				today.append(latestArticle)
//			}
//			
//			let latestData = WidgetData(currentUnreadCount: SmartFeedsController.shared.unreadFeed.unreadCount,
//										currentTodayCount: SmartFeedsController.shared.todayFeed.unreadCount,
//										currentStarredCount: try! SmartFeedsController.shared.starredFeed.fetchArticles().count,
//										unreadArticles: unread,
//										starredArticles: starred,
//										todayArticles:today,
//										lastUpdateTime: Date())
//			
//			
//			DispatchQueue.global().async { [weak self] in
//				guard let self = self else { return }
//				
//				self.backgroundTaskID = UIApplication.shared.beginBackgroundTask (withName: "com.ranchero.NetNewsWire.Encode") {
//					 UIApplication.shared.endBackgroundTask(self.backgroundTaskID!)
//					self.backgroundTaskID = .invalid
//				}
//				let encodedData = try? JSONEncoder().encode(latestData)
//				
//				os_log(.debug, log: self.log, "Finished encoding widget data.")
//				
//				if self.fileExists() {
//					try? FileManager.default.removeItem(at: self.dataURL!)
//					os_log(.debug, log: self.log, "Removed widget data from container.")
//				}
//				if FileManager.default.createFile(atPath: self.dataURL!.path, contents: encodedData, attributes: nil) {
//					os_log(.debug, log: self.log, "Wrote widget data to container.")
//					WidgetCenter.shared.reloadAllTimelines()
//					UIApplication.shared.endBackgroundTask(self.backgroundTaskID!)
//					self.backgroundTaskID = .invalid
//				} else {
//					UIApplication.shared.endBackgroundTask(self.backgroundTaskID!)
//					self.backgroundTaskID = .invalid
//				}
//				
//			}
//		}
	}
	
	private func fileExists() -> Bool {
		FileManager.default.fileExists(atPath: dataURL!.path)
	}
	
}