//
//  DownloadView.swift
//  Browse
//
//  Created by Javier Cicchelli on 17/12/2022.
//  Copyright © 2022 Röck+Cöde. All rights reserved.
//

import DataModels
import Foundation
import KeychainStorage
import SwiftUI

struct DownloadView: View {
    
    // MARK: Storages
    
    @KeychainStorage(key: .KeychainStorage.account) private var account: Account?
    
    // MARK: States
    
    @State private var data: Data?
    
    // MARK: Properties
    
    private let id: String
    private let name: String
    private let downloaded: ActionClosure
    
    private let getData: GetDataUseCase = .init()
    
    // MARK: Initialisers
    
    init(
        id: String,
        name: String,
        data: Data? = nil,
        downloaded: @escaping ActionClosure
    ) {
        self.id = id
        self.name = name
        self.downloaded = downloaded
        
        self._data = .init(initialValue: data)
    }
    
    // MARK: Body
    
    var body: some View {
        if let data {
            SaveDocumentPicker(
                fileName: name,
                fileData: data
            ) { error in
                guard error == nil else {
                    // TODO: Handle this error case.
                    return
                }
                
                downloaded()
            }
        } else {
            LoadingView()
                .task {
                    await loadData()
                }
        }
    }

}

// MARK: - Helpers

private extension DownloadView {
    func loadData() async {
        guard let account else {
            // TODO: Handle this error case.
            return
        }
        
        do {
            data = try await getData(
                id: id,
                username: account.username,
                password: account.password
            )
        } catch {
            // TODO: Handle this error case.
        }
    }
}

// MARK: - Previews

struct DownloadView_Previews: PreviewProvider {
    static var previews: some View {
        DownloadView(
            id: "1234567890",
            name: "some-name.txt"
        ) {
            // Downloaded closure.
        }
    }
}