/**
 * `materialTooltip`: shows an `<x-tooltip>` popover for the control it belongs to.
 *
 * The trigger is the popover's parent element (the button, or the standalone wrapper). Hover
 * counts only for a pointer that can hover, after a short delay so a pointer passing over a
 * toolbar does not flash every label; keyboard focus shows it at once — but not the focus a sheet,
 * a dialog or the modal rail moves to its first control as it opens (layers.js), which would put
 * a tooltip over a sheet's close button the moment the sheet appears. A press and Escape hide it
 * at once; leaving and blur let it stand for M3's 1.5s, so the words can still be read while the
 * pointer moves on. Only one tooltip is up at a time: showing one takes the last one down, which
 * the browser will not do for us because these are `popover="manual"`.
 */
import { openingFocus } from './layers.js'

const HOVER_DELAY_MS = 500
export const LEAVE_DELAY_MS = 1500

let visible = null

/**
 * The hover/focus/Escape timing a tooltip and a transient rich tooltip (rich-tooltip.js) share:
 * shows after HOVER_DELAY_MS on a pointer that can hover, at once on a focus `focusable` accepts
 * (never the focus layers.js moves as a sheet or dialog opens), hides after LEAVE_DELAY_MS once
 * the pointer leaves, and at once on Escape. `open`, `show` and `hide` do the actual popover call;
 * a caller adds its own extra listeners (a press, a blur) on the returned `signal`, and calls
 * `hide` from them.
 */
export function hoverPopover(el, { open, show, hide, focusable }) {
    const controller = new AbortController()
    const { signal } = controller
    let timer = null

    const delayed = (action, delay) => {
        clearTimeout(timer)
        timer = setTimeout(action, delay)
    }

    const showLater = (delay) => delayed(() => !open() && show(), delay)
    const hideLater = (delay = 0) => delayed(() => open() && hide(), delay)

    el.addEventListener('pointerenter', (event) => event.pointerType === 'mouse' && showLater(HOVER_DELAY_MS), { signal })
    el.addEventListener('pointerleave', () => hideLater(LEAVE_DELAY_MS), { signal })
    el.addEventListener('focusin', (event) => !openingFocus(event) && focusable(event) && showLater(0), { signal })
    document.addEventListener('keydown', (event) => event.key === 'Escape' && hideLater(), { signal })

    return {
        hide: hideLater,
        signal,
        destroy() {
            clearTimeout(timer)
            controller.abort()
        },
    }
}

document.addEventListener('alpine:init', () => {
    window.Alpine.data('materialTooltip', () => ({
        popover: null,

        init() {
            const tip = this.$el
            const trigger = tip.parentElement

            const popover = (this.popover = hoverPopover(trigger, {
                open: () => tip.matches(':popover-open'),
                show: () => {
                    if (!tip.isConnected) {
                        return
                    }

                    if (visible && visible !== tip && visible.matches(':popover-open')) {
                        visible.hidePopover()
                    }

                    visible = tip
                    tip.showPopover()
                },
                hide: () => {
                    tip.hidePopover()

                    if (visible === tip) {
                        visible = null
                    }
                },
                focusable: () => trigger.matches(':focus-within:has(:focus-visible), :focus-visible'),
            }))

            trigger.addEventListener('pointerdown', () => popover.hide(), { signal: popover.signal })
            trigger.addEventListener('focusout', () => popover.hide(LEAVE_DELAY_MS), { signal: popover.signal })
        },

        destroy() {
            this.popover.destroy()

            if (visible === this.$el) {
                visible = null
            }
        },
    }))
})