/** Shim for the keyboard API because it won't hit in FF57. */

import * as Messaging from './messaging'
import * as msgsafe from './msgsafe'
import {isTextEditable} from './dom'

function keyeventHandler(ke: KeyboardEvent) {
    // Ignore JS-generated events for security reasons.
    if (! ke.isTrusted) return

    // Bad workaround: never suppress events in an editable field
    // and never suppress keys pressed with modifiers
    if (! (isTextEditable(ke.target as Node) || ke.ctrlKey || ke.altKey)) {
        suppressKey(ke)
    }

    Messaging.message("keydown_background", "recvEvent", [msgsafe.KeyboardEvent(ke)])
}


/** Choose to suppress a key or not based on module state */
function suppressKey(ke: KeyboardEvent) {
    // Silly way
    if (preventDefault) ke.preventDefault()
    if (stopPropagation) ke.stopPropagation()

    // Else if in known maps.
    // StartsWith happens to work for our maps so far. Obviously won't in the future.
    if ([...nmaps.keys()].find((map) => map.startsWith(ke.key))) {
        ke.preventDefault()
        ke.stopPropagation()
    }
}

/** Suppressing all keys from page load means scrolling by arrow key doesn't work until page is reloaded with suppression off. IDK why. Maybe a bug? */
export function suppress(pD?: boolean, sP?: boolean) {
    if (pD !== undefined) { preventDefault = pD }
    if (sP !== undefined) { stopPropagation = sP }
    console.log(pD, sP, preventDefault, stopPropagation)
}

/** UNUSED, hardcoded for now */
/* export function mapState(maps) { */
/*     nmaps = maps */
/* } */

// State
let preventDefault = false
let stopPropagation = false

/* let nmaps: Map<string, string> */
const nmaps = new Map<string, string>([
    ["o", "fillcmdline open"],
    ["O", "current-url open"],
    ["w", "fillcmdline winopen"],
    ["W", "current-url winopen"],
    ["t", "tabopen"],
    //["t", "fillcmdline tabopen"], // for now, use mozilla completion
    ["]]", "clicknext"], 
    ["[[", "clicknext prev"], 
    ["T", "current-url tab"],
    ["yy", "clipboard yank"],
    ["p", "clipboard open"],
    ["P", "clipboard tabopen"],
    ["j", "scrollline 10"],
    ["k", "scrollline -10"],
    ["h", "scrollpx -50"],
    ["l", "scrollpx 50"],
    ["G", "scrollto 100"],
    ["gg", "scrollto 0"],
    ["H", "back"],
    ["L", "forward"],
    ["d", "tabclose"],
    ["u", "undo"],
    ["r", "reload"],
    ["R", "reloadhard"],
    ["gt", "tabnext"],
    ["gT", "tabprev"],
    ["gr", "reader"],
    [":", "fillcmdline"],
    ["s", "fillcmdline google"],
    ["xx", "something"],
    ["i", "insertmode"],
    ["b", "openbuffer"],
    // Special keys must be prepended with 🄰
    // ["🄰Backspace", "something"],
])

// Add listeners
window.addEventListener("keydown", keyeventHandler, true)
import * as SELF from './keydown_content'
Messaging.addListener('keydown_content', Messaging.attributeCaller(SELF))

// Get current suppression state
async function init() {
    let state = await Messaging.message("keydown_background", "state")
    suppress(...state)
}
init()


// Dummy export so that TS treats this as a module.
export {}