//
//  DraftsView.swift
//  Tusker
//
//  Created by Shadowfacts on 11/9/22.
//  Copyright © 2022 Shadowfacts. All rights reserved.
//

import SwiftUI

struct DraftsView: View {
    let currentDraft: Draft
    // don't pass this in via the environment b/c it crashes on macOS (at least, in Designed for iPad mode) since the environment doesn't get propagated through the modal popup window or something
    let mastodonController: MastodonController
    @EnvironmentObject var uiState: ComposeUIState
    @StateObject private var draftsManager = DraftsManager.shared
    @State private var draftForDifferentReply: Draft?
    
    private var visibleDrafts: [Draft] {
        draftsManager.sorted.filter {
            $0.accountID == mastodonController.accountInfo!.id && $0.id != currentDraft.id
        }
    }
    
    var body: some View {
        NavigationView {
            List {
                ForEach(visibleDrafts) { draft in
                    Button {
                        maybeSelectDraft(draft)
                    } label: {
                        DraftView(draft: draft)
                    }
                    .contextMenu {
                        Button(role: .destructive) {
                            draftsManager.remove(draft)
                        } label: {
                            Label("Delete Draft", systemImage: "trash")
                        }
                    }
                    .onDrag {
                        let activity = UserActivityManager.editDraftActivity(id: draft.id, accountID: mastodonController.accountInfo!.id)
                        activity.displaysAuxiliaryScene = true
                        return NSItemProvider(object: activity)
                    }
                }
                .onDelete { indices in
                    indices
                        .map { visibleDrafts[$0] }
                        .forEach { draftsManager.remove($0) }
                }
            }
            .listStyle(.plain)
            .navigationTitle(Text("Drafts"))
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("Cancel") {
                        uiState.isShowingDraftsList = false
                    }
                }
            }
        }
        .alertWithData("Different Reply", data: $draftForDifferentReply) { draft in
            Button("Cancel", role: .cancel) {
                draftForDifferentReply = nil
            }
            Button("Restore Draft") {
                uiState.delegate?.selectDraft(draft)
            }
        } message: { draft in
            Text("The selected draft is a reply to a different post, do you wish to use it?")
        }
    }
    
    private func maybeSelectDraft(_ draft: Draft) {
        if draft.inReplyToID != currentDraft.inReplyToID,
           currentDraft.hasContent {
            draftForDifferentReply = draft
        } else {
            uiState.delegate?.selectDraft(draft)
        }
    }
}

struct DraftView: View {
    @ObservedObject private var draft: Draft
    
    init(draft: Draft) {
        self._draft = ObservedObject(wrappedValue: draft)
    }
    
    var body: some View {
        HStack {
            VStack(alignment: .leading) {
                if draft.contentWarningEnabled {
                    Text(draft.contentWarning)
                        .font(.body.bold())
                        .foregroundColor(.secondary)
                }
                
                Text(draft.text)
                    .font(.body)
                
                HStack(spacing: 8) {
                    ForEach(draft.attachments) { attachment in
                        ComposeAttachmentImage(attachment: attachment, fullSize: false)
                            .frame(width: 50, height: 50)
                            .cornerRadius(5)
                    }
                }
            }
            
            Spacer()
            
            Text(draft.lastModified.timeAgoString())
                .font(.body)
                .foregroundColor(.secondary)
        }
    }
}

//struct DraftsView_Previews: PreviewProvider {
//    static var previews: some View {
//        DraftsView(currentDraft: Draft(accountID: ""))
//    }
//}