//
//  ComposeUIState.swift
//  Tusker
//
//  Created by Shadowfacts on 8/24/20.
//  Copyright © 2020 Shadowfacts. All rights reserved.
//

import SwiftUI

protocol ComposeUIStateDelegate: AnyObject {
    var assetPickerDelegate: AssetPickerViewControllerDelegate? { get }
    
    func dismissCompose(mode: ComposeUIState.DismissMode)
    // @available(iOS, obsoleted: 16.0)
    func presentAssetPickerSheet()
    func presentComposeDrawing()
    func selectDraft(_ draft: OldDraft)
    func paste(itemProviders: [NSItemProvider])
}

class ComposeUIState: ObservableObject {
    
    weak var delegate: ComposeUIStateDelegate?
    
    @Published var draft: OldDraft
    @Published var isShowingSaveDraftSheet = false
    @Published var isShowingDraftsList = false
    @Published var attachmentsMissingDescriptions = Set<UUID>()
    @Published var autocompleteState: AutocompleteState? = nil
    @Published var isDucking = false
    
    var composeDrawingMode: ComposeDrawingMode?
    
    var shouldEmojiAutocompletionBeginExpanded = false
    @Published var currentInput: ComposeInput?
    
    init(draft: OldDraft) {
        self.draft = draft
    }
    
}

extension ComposeUIState {
    enum ComposeDrawingMode {
        case createNew
        case edit(id: UUID)
    }
}

extension ComposeUIState {
    enum AutocompleteState: Equatable {
        case mention(String)
        case emoji(String)
        case hashtag(String)
    }
}

extension ComposeUIState {
    enum DismissMode {
        case cancel, post
    }
}

protocol ComposeInput: AnyObject {
    var toolbarElements: [ComposeUIState.ToolbarElement] { get }
    
    func autocomplete(with string: String)
    
    func applyFormat(_ format: StatusFormat)
    
    func beginAutocompletingEmoji()
}

extension ComposeUIState {
    enum ToolbarElement {
        case emojiPicker
        case formattingButtons
    }
}