/*

    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 Contacts tab.

                Implements the unwind saveContact segue to create and save a contact

                to the default container.

                Source view conroller for the fetchAllContacts, fetchContactsMatchingName, 

                addContact, performUpdateContact, and deleteContact segues.

*/

import UIKit

import Contacts

class ContactsMenu: MenuViewController {

    // MARK: - Handle refreshTabNotification

    override func handleRefreshTabNotification(_ notification: Notification) {

        let tabBarNotification = notification.object as! TabBarViewController

         // Update the data model for this tab.

        navigationMenuContent = tabBarNotification.contactsMenu

        tableView.reloadData()

    }

    // MARK: - UITableViewDataSource

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

        return navigationMenuContent[section].title

    }

    // MARK: - Convenience Method

    /// Create a data model object that organize contacts into person and organization.

    fileprivate func buildDataModel(with contacts: [CNContact]) -> [MGCModel] {

        var result = [MGCModel]()

        // Parse contacts according to their type: Person or Organization.

        let persons = menuContactStoreUtilities.filter(contacts, for: .person)

        let organization = menuContactStoreUtilities.filter(contacts, for: .organization)

        if !persons.isEmpty {

            result.append(MGCModel(tab: MGCAppConfiguration.Content.contacts,

                               content: persons,

                              category: MGCAppConfiguration.MainStoryboard.TableHeaderSection.Contacts.person))

        }

        if !organization.isEmpty {

            result.append(MGCModel(tab: MGCAppConfiguration.Content.contacts,

                               content: organization,

                              category: MGCAppConfiguration.MainStoryboard.TableHeaderSection.Contacts.organization))

        }

        return result

    }

    // MARK: - Navigation

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

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

        // Implement the "Fetch all contacts" feature.

        if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Contacts.fetchAllContacts {

            let groupedViewController = segue.destination as! GroupedViewController

            groupedViewController.title = item.title

            MGCContactStore.sharedInstance.fetchContacts(({(contacts: [CNContact]) in

                if contacts.count > 0 {

                    groupedViewController.data = self.buildDataModel(with: contacts)

                }

            }))

        }

        // Implement the "Fetch contacts matching a name" feature.

        else if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Contacts.fetchContactsMatchingName {

            let searchViewController = segue.destination as! SearchViewController

            MGCContactStore.sharedInstance.fetchContacts(({(contacts: [CNContact]) in

                if contacts.count > 0 {

                    searchViewController.data = contacts

                }

            }))

        }

        // Implement the "Update a contact" feature.

        else if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Contacts.performUpdateContact {

            let mainViewController = segue.destination as! MainViewController

            mainViewController.title = item.title

            MGCContactStore.sharedInstance.fetchContacts(({(contacts: [CNContact]) in

                if contacts.count > 0 {

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

                                                    content: contacts,

                                                      segue: item.segue)]

                }

            }))

        }

        // Implement the "Delete a contact" feature.

        else if segue.identifier == MGCAppConfiguration.MainStoryboard.SegueIdentifiers.Contacts.deleteContact {

            let editViewController = segue.destination as! EditViewController

            editViewController.title = item.title

            MGCContactStore.sharedInstance.fetchContacts(({(contacts: [CNContact]) in

                if contacts.count > 0 {

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

                                                    content: contacts,

                                                      segue: item.segue)]

                }

            }))

        }

    }

    // MARK: - Actions

    /// Dismiss the Add Contact view controller.

    @IBAction func cancel(_ sender: UIStoryboardSegue) {

        dismiss(animated: true, completion: nil)

    }

    /// Add a new contact.

    @IBAction func saveContact(_ sender: UIStoryboardSegue) {

        if let addContactViewController = sender.source as? AddContactViewController, let newContact = addContactViewController.contact {

            MGCContactStore.sharedInstance.add(newContact)

        }

    }

}