//
//  RecommendAccountSection.swift
//  Mastodon
//
//  Created by sxiaojian on 2021/4/1.
//

import CoreData
import CoreDataStack
import Foundation
import MastodonSDK
import UIKit
import MetaTextKit
import MastodonMeta
import Combine

enum RecommendAccountSection: Equatable, Hashable {
    case main
}

//extension RecommendAccountSection {
//    static func collectionViewDiffableDataSource(
//        for collectionView: UICollectionView,
//        dependency: NeedsDependency,
//        delegate: SearchRecommendAccountsCollectionViewCellDelegate,
//        managedObjectContext: NSManagedObjectContext
//    ) -> UICollectionViewDiffableDataSource<RecommendAccountSection, NSManagedObjectID> {
//        UICollectionViewDiffableDataSource(collectionView: collectionView) { [weak delegate] collectionView, indexPath, objectID -> UICollectionViewCell? in
//            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: String(describing: SearchRecommendAccountsCollectionViewCell.self), for: indexPath) as! SearchRecommendAccountsCollectionViewCell
//            managedObjectContext.performAndWait {
//                let user = managedObjectContext.object(with: objectID) as! MastodonUser
//                configure(cell: cell, user: user, dependency: dependency)
//            }
//            cell.delegate = delegate
//            return cell
//        }
//    }
//    
//    static func configure(
//        cell: SearchRecommendAccountsCollectionViewCell,
//        user: MastodonUser,
//        dependency: NeedsDependency
//    ) {
//        configureContent(cell: cell, user: user)
//        
//        if let currentMastodonUser = dependency.context.authenticationService.activeMastodonAuthentication.value?.user {
//            configureFollowButton(with: user, currentMastodonUser: currentMastodonUser, followButton: cell.followButton)
//        }
//        
//        Publishers.CombineLatest(
//            ManagedObjectObserver.observe(object: user).eraseToAnyPublisher().mapError { $0 as Error },
//            dependency.context.authenticationService.activeMastodonAuthentication.setFailureType(to: Error.self)
//        )
//        .receive(on: DispatchQueue.main)
//        .sink { _ in
//            // do nothing
//        } receiveValue: { [weak cell] change, authentication in
//            guard let cell = cell else { return }
//            guard case .update(let object) = change.changeType,
//                  let user = object as? MastodonUser else { return }
//            guard let currentMastodonUser = authentication?.user else { return }
//            
//            configureFollowButton(with: user, currentMastodonUser: currentMastodonUser, followButton: cell.followButton)
//        }
//        .store(in: &cell.disposeBag)
//        
//    }
//    
//    static func configureContent(
//        cell: SearchRecommendAccountsCollectionViewCell,
//        user: MastodonUser
//    ) {
//        do {
//            let mastodonContent = MastodonContent(content: user.displayNameWithFallback, emojis: user.emojis.asDictionary)
//            let metaContent = try MastodonMetaContent.convert(document: mastodonContent)
//            cell.displayNameLabel.configure(content: metaContent)
//        } catch {
//            let metaContent = PlaintextMetaContent(string: user.displayNameWithFallback)
//            cell.displayNameLabel.configure(content: metaContent)
//        }
//        cell.acctLabel.text = "@" + user.acct
//        cell.avatarImageView.af.setImage(
//            withURL: user.avatarImageURLWithFallback(domain: user.domain),
//            placeholderImage: UIImage.placeholder(color: .systemFill),
//            imageTransition: .crossDissolve(0.2)
//        )
//        cell.headerImageView.af.setImage(
//            withURL: URL(string: user.header)!,
//            placeholderImage: UIImage.placeholder(color: .systemFill),
//            imageTransition: .crossDissolve(0.2)
//        )
//    }
//    
//    static func configureFollowButton(
//        with mastodonUser: MastodonUser,
//        currentMastodonUser: MastodonUser,
//        followButton: HighlightDimmableButton
//    ) {
//        let relationshipActionSet = relationShipActionSet(mastodonUser: mastodonUser, currentMastodonUser: currentMastodonUser)
//        followButton.setTitle(relationshipActionSet.title, for: .normal)
//    }
//    
//    static func relationShipActionSet(
//        mastodonUser: MastodonUser,
//        currentMastodonUser: MastodonUser
//    ) -> ProfileViewModel.RelationshipActionOptionSet {
//        var relationshipActionSet = ProfileViewModel.RelationshipActionOptionSet([.follow])
//        let isFollowing = mastodonUser.followingBy.flatMap { $0.contains(currentMastodonUser) } ?? false
//        if isFollowing {
//            relationshipActionSet.insert(.following)
//        }
//        
//        let isPending = mastodonUser.followRequestedBy.flatMap { $0.contains(currentMastodonUser) } ?? false
//        if isPending {
//            relationshipActionSet.insert(.pending)
//        }
//        
//        let isBlocking = mastodonUser.blockingBy.flatMap { $0.contains(currentMastodonUser) } ?? false
//        if isBlocking {
//            relationshipActionSet.insert(.blocking)
//        }
//        
//        let isBlockedBy = currentMastodonUser.blockingBy.flatMap { $0.contains(mastodonUser) } ?? false
//        if isBlockedBy {
//            relationshipActionSet.insert(.blocked)
//        }
//        return relationshipActionSet
//    }
//
//}
//    
extension RecommendAccountSection {
    
    struct Configuration {
        weak var suggestionAccountTableViewCellDelegate: SuggestionAccountTableViewCellDelegate?
    }

    static func tableViewDiffableDataSource(
        tableView: UITableView,
        context: AppContext,
        configuration: Configuration
    ) -> UITableViewDiffableDataSource<RecommendAccountSection, RecommendAccountItem> {
        UITableViewDiffableDataSource(tableView: tableView) { tableView, indexPath, item -> UITableViewCell? in
            let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: SuggestionAccountTableViewCell.self)) as! SuggestionAccountTableViewCell
            switch item {
            case .account(let record):
                context.managedObjectContext.performAndWait {
                    guard let user = record.object(in: context.managedObjectContext) else { return }
                    cell.configure(user: user)
                }
                
                context.authenticationService.activeMastodonAuthenticationBox
                    .map { $0 as UserIdentifier? }
                    .assign(to: \.userIdentifier, on: cell.viewModel)
                    .store(in: &cell.disposeBag)
                cell.delegate = configuration.suggestionAccountTableViewCellDelegate
            }
            return cell
        }
    }
    
}