import {restartBlink} from "./selection.js"
import {webkit} from "../util/browser.js"
import {addClass, rmClass} from "../util/dom.js"
import {signal} from "../util/event.js"

export function ensureFocus(cm) {
  if (!cm.state.focused) {
    cm.display.input.focus();
    onFocus(cm)
  }
}

export function delayBlurEvent(cm) {
  cm.state.delayingBlurEvent = true
  setTimeout(() => {
    if (cm.state.delayingBlurEvent) {
      cm.state.delayingBlurEvent = false
      onBlur(cm)
    }
  }, 100)
}

export function onFocus(cm, e) {
  if (cm.state.delayingBlurEvent) cm.state.delayingBlurEvent = false

  if (cm.options.readOnly == "nocursor") return
  if (!cm.state.focused) {
    signal(cm, "focus", cm, e)
    cm.state.focused = true
    addClass(cm.display.wrapper, "CodeMirror-focused")
    // This test prevents this from firing when a context
    // menu is closed (since the input reset would kill the
    // select-all detection hack)
    if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
      cm.display.input.reset()
      if (webkit) setTimeout(() => cm.display.input.reset(true), 20) // Issue #1730
    }
    cm.display.input.receivedFocus()
  }
  restartBlink(cm)
}

export function onBlur(cm, e) {
  if (cm.state.delayingBlurEvent) return

  if (cm.state.focused) {
    signal(cm, "blur", cm, e)
    cm.state.focused = false
    rmClass(cm.display.wrapper, "CodeMirror-focused")
  }
  clearInterval(cm.display.blinker)
  setTimeout(() => {
    if (!cm.state.focused) cm.display.shift = false
  }, 150)
}
