//
//  UserActivities.swift
//  Reader
//
//  Created by Shadowfacts on 1/15/22.
//

import Foundation
import Persistence

extension NSUserActivity {
    
    static let preferencesType = "net.shadowfacts.Reader.activity.preferences"
    static let addAccountType = "net.shadowfacts.Reader.activity.add-account"
    static let activateAccountType = "net.shadowfacts.Reader.activity.activate-account"
    static let readUnreadType = "net.shadowfacts.Reader.activity.read-unread"
    static let readAllType = "net.shadowfacts.Reader.activity.read-all"
    static let readFeedType = "net.shadowfacts.Reader.activity.read-feed"
    static let readGroupType = "net.shadowfacts.Reader.activity.read-group"
    static let readItemType = "net.shadowfacts.Reader.activity.read-item"
    
    func accountID() -> Data? {
        let types = [
            NSUserActivity.activateAccountType,
            NSUserActivity.readUnreadType,
            NSUserActivity.readAllType,
        ]
        if types.contains(self.activityType),
           let id = self.userInfo?["accountID"] as? Data {
            return id
        } else {
            return nil
        }
    }
    
    var feedID: String? {
        if activityType == NSUserActivity.readFeedType {
            return userInfo?["feedID"] as? String
        } else {
            return nil
        }
    }
    
    var groupID: String? {
        if activityType == NSUserActivity.readGroupType {
            return userInfo?["groupID"] as? String
        } else {
            return nil
        }
    }
    
    var itemID: String? {
        if activityType == NSUserActivity.readItemType {
            return userInfo?["itemID"] as? String
        } else {
            return nil
        }
    }
    
    var topElementSelector: String? {
        get {
            userInfo?["topElementSelector"] as? String
        }
        set {
            if let newValue = newValue {
                addUserInfoEntries(from: ["topElementSelector": newValue])
            } else {
                userInfo?.removeValue(forKey: "topElementSelector")
            }
        }
    }

    static func preferences() -> NSUserActivity {
        return NSUserActivity(activityType: preferencesType)
    }
    
    static func addAccount() -> NSUserActivity {
        return NSUserActivity(activityType: addAccountType)
    }
    
    static func activateAccount(_ account: LocalData.Account) -> NSUserActivity {
        let activity = NSUserActivity(activityType: activateAccountType)
        activity.userInfo = [
            "accountID": account.id,
        ]
        return activity
    }
    
    static func readUnread(account: LocalData.Account) -> NSUserActivity {
        let activity = NSUserActivity(activityType: readUnreadType)
        activity.isEligibleForHandoff = true
        activity.isEligibleForPrediction = true
        activity.title = "Show unread articles"
        activity.userInfo = [
            "accountID": account.id
        ]
        activity.targetContentIdentifier = account.id.base64EncodedString()
        return activity
    }
    
    static func readAll(account: LocalData.Account) -> NSUserActivity {
        let activity = NSUserActivity(activityType: readAllType)
        activity.isEligibleForHandoff = true
        activity.isEligibleForPrediction = true
        activity.title = "Show all articles"
        activity.userInfo = [
            "accountID": account.id
        ]
        activity.targetContentIdentifier = account.id.base64EncodedString()
        return activity
    }
    
    static func readFeed(_ feed: Feed, account: LocalData.Account) -> NSUserActivity {
        let activity = NSUserActivity(activityType: readFeedType)
        activity.isEligibleForHandoff = true
        activity.isEligibleForPrediction = true
        activity.title = "Show articles from \(feed.title!)"
        activity.userInfo = [
            "accountID": account.id,
            "feedID": feed.id!
        ]
        activity.targetContentIdentifier = account.id.base64EncodedString()
        return activity
    }
    
    static func readGroup(_ group: Group, account: LocalData.Account) -> NSUserActivity {
        let activity = NSUserActivity(activityType: readGroupType)
        activity.isEligibleForHandoff = true
        activity.isEligibleForPrediction = true
        activity.title = "Show articles from \(group.title)"
        activity.userInfo = [
            "accountID": account.id,
            "groupID": group.id!
        ]
        activity.targetContentIdentifier = account.id.base64EncodedString()
        return activity
    }
    
    static func readItem(_ item: Item, account: LocalData.Account) -> NSUserActivity {
        let activity = NSUserActivity(activityType: readItemType)
        activity.isEligibleForHandoff = true
        activity.userInfo = [
            "accountID": account.id,
            "itemID": item.id!,
        ]
        return activity
    }
    
}