/*

    Copyright (C) 2017 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    A MenuViewController subclass that displays and manages navigation 

                 menu features in the Groups tab.

                 Implements the unwind saveGroup segue to create and save a group to

                 a given container.

                 Source view conroller for the fetchAllGroups, 

                 performFetchContactsPerGroup, addGroup, deleteGroup, 

                 performAddContactToGroup, and performRemoveContactFromGroup segues.

*/

import UIKit

import Contacts

class GroupsMenu: MenuViewController {

   // MARK: - Handle refreshTabNotification

    override func handleRefreshTabNotification(_ notification: Notification) {

        let tabBarNotification = notification.object as! TabBarViewController

        // Update the data model for this tab.

        navigationMenuContent = tabBarNotification.groupsMenu

        tableView.reloadData()

    }

    // MARK: - UITableViewDataSource

    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {

        return navigationMenuContent[section].title

    }

    // MARK: - Convenience Method

    fileprivate func handleAddGroup(with segue: UIStoryboardSegue, with title: String) {

        let navigationController = segue.destination as! UINavigationController

        let addGroupViewController = navigationController.topViewController as! AddGroupViewController

        addGroupViewController.title = title

        addGroupViewController.data = [MGCModel(tab: MGCAppConfiguration.Content.groups,

                                           category: MGCAppConfiguration.MainStoryboard.TableHeaderSection.Groups.addGroup)]

        /* Exchange accounts don't support groups. Fetch local and cardDAV 

           containers that can be chosen to contain a group.

        */

        MGCContactStore.sharedInstance.fetchContainers({(containers: [CNContainer]) in

            if containers.count > 0 {

                var dataModel = [CNContainer]()

                let carddav = self.menuContactStoreUtilities.filter(containers, for: .cardDAV)

                if carddav.count > 0 {

                    dataModel.append(contentsOf: carddav)

                }

                let local = self.menuContactStoreUtilities.filter(containers, for: .local)

                if local.count > 0 {

                    dataModel.append(contentsOf: local)

                }

                addGroupViewController.data.append(MGCModel(tab: MGCAppConfiguration.Content.groups,

                                                        content: dataModel,

                                                       category: MGCAppConfiguration.MainStoryboard.TableHeaderSection.Groups.selectContainer))

            }

        })

    }

    // MARK: - Navigation

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

        let item = navigationMenuContent[tableView.indexPathForSelectedRow!.section].section[tableView.indexPathForSelectedRow!.row]

        // Implement the "Fetch all groups" feature.

        if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Groups.fetchAllGroups {

            let detailViewController = segue.destination as! DetailViewController

            detailViewController.title = item.title

             MGCContactStore.sharedInstance.fetchGroups({(groups: [CNGroup]) in

                if groups.count > 0 {

                    detailViewController.data = [MGCModel(tab: MGCAppConfiguration.Content.containers,

                                                      content: groups,

                                                     category: MGCAppConfiguration.Content.groups)]

                }

             })

        }

        // Implement the "Fetch contacts per group" feature.

        else if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Groups.performFetchContactsPerGroup {

            let mainViewController = segue.destination as! MainViewController

            mainViewController.title = item.title

            MGCContactStore.sharedInstance.fetchGroups({(groups: [CNGroup]) in

                if groups.count > 0 {

                    mainViewController.data = [MGCModel(tab: MGCAppConfiguration.Content.groups,

                                                    content: groups,

                                                      segue: item.segue)]

                }

            })

        }

        // Implement the "Add a group" feature.

        else if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Groups.addGroup {

            handleAddGroup(with: segue, with: item.title)

        }

        // Implement the "Update a group" feature.

        else if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Groups.performUpdateGroup {

            let mainViewController = segue.destination as! MainViewController

            mainViewController.title = item.title

            MGCContactStore.sharedInstance.fetchGroups({(groups: [CNGroup]) in

                if groups.count > 0 {

                    mainViewController.data = [MGCModel(tab: MGCAppConfiguration.Content.groups,

                                                    content: groups,

                                                      segue: item.segue)]

                }

            })

        }

        // Implement the "Delete a group" feature.

        else if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Groups.deleteGroup {

            let editViewController = segue.destination as! EditViewController

            editViewController.title = item.title

            MGCContactStore.sharedInstance.fetchGroups({(groups: [CNGroup]) in

                if groups.count > 0 {

                    editViewController.data = [MGCModel(tab: MGCAppConfiguration.Content.groups,

                                                    content: groups,

                                                      segue: item.segue)]

                }

            })

        }

        // Implement the "Add a contact to a group" feature.

        else if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Groups.performAddContactToGroup {

            let plainViewController = segue.destination as! PlainViewController

            plainViewController.title = item.title

            MGCContactStore.sharedInstance.fetchGroups({(groups: [CNGroup]) in

                if groups.count > 0 {

                    plainViewController.data = [MGCModel(tab: MGCAppConfiguration.Content.groups,

                                                     content: groups,

                                                       segue: item.segue)]

                }

            })

        }

        // Implement the "Remove contact from a group" feature.

        else if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Groups.performRemoveContactFromGroup {

            let mainViewController = segue.destination as! MainViewController

            mainViewController.title = item.title

            MGCContactStore.sharedInstance.fetchGroups({(groups: [CNGroup]) in

                if groups.count > 0 {

                    mainViewController.data = [MGCModel(tab: MGCAppConfiguration.Content.groups,

                                                    content: groups,

                                                      segue: item.segue)]

                }

            })

        }

    }

    // MARK: - Actions

    @IBAction func cancel(_ sender: UIStoryboardSegue) {

        dismiss(animated: true, completion: nil)

    }

    /// Attempt to create and save a group to a given container.

    @IBAction func saveGroup(_ sender: UIStoryboardSegue) {

        if  let addGroupViewController = sender.source as? AddGroupViewController, let name = addGroupViewController.group, let containerID = addGroupViewController.containerID {

            MGCContactStore.sharedInstance.save(name, toContainerWithIdentifier: containerID)

        }

    }

}