//
//  BrowseView.swift
//  Browse
//
//  Created by Javier Cicchelli on 03/12/2022.
//  Copyright © 2022 Röck+Cöde. All rights reserved.
//

import DataModels
import KeychainStorage
import SwiftUI

public struct BrowseView: View {
    
    // MARK: Storages
    
    @KeychainStorage(key: .KeychainStorage.account) private var account: Account?
    
    // MARK: States
    
    @State private var items: [any FileSystemIdIdentifiable] = []
    
    // MARK: Properties
    
    private let folder: Folder
    private let createFolder: ActionClosure
    private let uploadFile: ActionClosure
    private let showProfile: ActionClosure
    
    private let getItems: GetItemsUseCase = .init()
    
    // MARK: Initialisers
    
    public init(
        folder: Folder,
        createFolder: @escaping ActionClosure,
        uploadFile: @escaping ActionClosure,
        showProfile: @escaping ActionClosure
    ) {
        self.folder = folder
        self.createFolder = createFolder
        self.uploadFile = uploadFile
        self.showProfile = showProfile
    }
    
    // MARK: Body
    
    public var body: some View {
        List {
            ForEach(items, id: \.id) { item in
                switch item {
                case is Folder:
                    FolderItem(item: item) { id in
                        // TODO: delete the item id from the backend.
                    }
                case is Document:
                    DocumentItem(item: item) { id in
                        // TODO: download the item id from the backend.
                    } delete: { id in
                        // TODO: delete the item id from the backend.
                    }
                default:
                    EmptyView()
                }
            }
        }
        .listStyle(.inset)
        .navigationTitle(folder.name)
        .toolbar {
            BrowseToolbar(
                createFolder: createFolder,
                uploadFile: uploadFile,
                showProfile: showProfile
            )
        }
        .task(id: folder) {
            await getItemsOrStop()
        }
    }
}
                
// MARK: - Helpers

private extension BrowseView {
    func getItemsOrStop() async {
        guard let account else { return }

        do {
            items = try await getItems(
                id: folder.id,
                username: account.username,
                password: account.password
            )
        } catch {
            // TODO: handle the error appropriately.
        }
    }
}

// MARK: - Previews

struct BrowseView_Previews: PreviewProvider {
    static var previews: some View {
        NavigationView {
            BrowseView(folder: .init(
                id: UUID().uuidString,
                name: "Some folder name"
            )) {
                // ...
            } uploadFile: {
                // ...
            } showProfile: {
                // ...
            }
        }
    }
}