import { Alert } from './gui/Alert'
import { CreateKeyboardListeners } from './input/keyboard'
import { Wush } from './shell/Wush'
import { Terminal } from './terminal/Terminal'
import { EventBroadcaster } from './utils/EventBroadcaster'

export const WEBSHELL_VERSION = "0.1.0"

// initialize object store for webfs
let WebfsDatabase: IDBDatabase | null = null

const request = indexedDB.open("webshell")

request.onupgradeneeded = event => {
    console.log("creating database")
    WebfsDatabase = (event.target as any).result as IDBDatabase
    WebfsDatabase.createObjectStore("webfs")
}

request.onerror = _ => {
    new Alert(
        "webfs error",
        "Failed to initialize the webfs database using IndexedDB. Make sure webshell does not have any IndexedDB related permissions disabled and try again.",
        'critical',
    ).Show()
}

request.onsuccess = event => {
    WebfsDatabase = (event.target as any).result as IDBDatabase
    console.log("database initialized")

    // initialize the app after the database
    init()
}

export const GetWebfsDatabase = (): IDBDatabase | null => WebfsDatabase

// terminal management
let CurrentTerminal: Terminal
export const SetCurrentTerminal = (terminal: Terminal) => CurrentTerminal = terminal
export const GetCurrentTerminal = (): Terminal => CurrentTerminal

// Initializes the app
const init = async () => {
    const localBroadcaster = new EventBroadcaster()

    // creates keyboard listeners for the local event broadcaster
    CreateKeyboardListeners(
        (key: string, isCharacter: boolean) => localBroadcaster.emit('keydown', key, isCharacter),
        (key: string, isCharacter: boolean) => localBroadcaster.emit('keyup', key, isCharacter),
    )

    const terminal = new Terminal()
    await terminal.LoadShell(new Wush(localBroadcaster, terminal))
}