//
//  Copyright (c) 2021 Open Whisper Systems. All rights reserved.
//

import Foundation
import UIKit

protocol ReplaceAdminViewControllerDelegate: AnyObject {
    func replaceAdmin(uuid: UUID)
}

// MARK: -

class ReplaceAdminViewController: OWSTableViewController2 {

    weak var replaceAdminViewControllerDelegate: ReplaceAdminViewControllerDelegate?

    private let candidates: Set<SignalServiceAddress>

    required init(candidates: Set<SignalServiceAddress>,
                  replaceAdminViewControllerDelegate: ReplaceAdminViewControllerDelegate) {
        assert(!candidates.isEmpty)

        self.candidates = candidates
        self.replaceAdminViewControllerDelegate = replaceAdminViewControllerDelegate

        super.init()
    }

    // MARK: - View Lifecycle

    @objc
    public override func viewDidLoad() {
        super.viewDidLoad()

        title = NSLocalizedString("REPLACE_ADMIN_VIEW_TITLE",
                                  comment: "The title for the 'replace group admin' view.")

        tableView.register(ContactTableViewCell.self, forCellReuseIdentifier: ContactTableViewCell.reuseIdentifier)

        updateTableContents()
    }

    private func updateTableContents() {
        let contents = OWSTableContents()

        let section = OWSTableSection()

        let sortedCandidates = databaseStorage.uiRead { transaction in
            self.contactsManagerImpl.sortSignalServiceAddresses(Array(self.candidates), transaction: transaction)
        }
        for address in sortedCandidates {
            section.add(OWSTableItem(dequeueCellBlock: { tableView in
                guard let cell = tableView.dequeueReusableCell(withIdentifier: ContactTableViewCell.reuseIdentifier) as? ContactTableViewCell else {
                    owsFailDebug("Missing cell.")
                    return UITableViewCell()
                }

                Self.databaseStorage.read { transaction in
                    let configuration = ContactCellConfiguration.build(address: address,
                                                                       localUserDisplayMode: .asUser,
                                                                       transaction: transaction)

                    let imageView = CVImageView()
                    imageView.setTemplateImageName("empty-circle-outline-24", tintColor: .ows_gray25)
                    configuration.accessoryView = ContactCellAccessoryView(accessoryView: imageView, size: .square(24))

                    cell.configure(configuration: configuration, transaction: transaction)
                }

                return cell
                },
                                     actionBlock: { [weak self] in
                                        self?.candidateWasSelected(candidate: address)
                }
            ))
        }

        contents.addSection(section)

        self.contents = contents
    }

    private func candidateWasSelected(candidate: SignalServiceAddress) {
        guard let replacementAdminUuid = candidate.uuid else {
            owsFailDebug("Invalid replacement Admin.")
            return
        }

        replaceAdminViewControllerDelegate?.replaceAdmin(uuid: replacementAdminUuid)
    }
}