import $ from "jquery";
import Micromodal from "micromodal";

import * as blueslip from "./blueslip";
import * as browser_history from "./browser_history";
import * as popovers from "./popovers";

let $active_overlay;
let close_handler;
let open_overlay_name;

function reset_state() {
    $active_overlay = undefined;
    close_handler = undefined;
    open_overlay_name = undefined;
}

export function is_active() {
    return Boolean(open_overlay_name);
}

export function is_modal_open() {
    return $(".micromodal").hasClass("modal--open");
}

export function is_overlay_or_modal_open() {
    return is_active() || is_modal_open();
}

export function info_overlay_open() {
    return open_overlay_name === "informationalOverlays";
}

export function settings_open() {
    return open_overlay_name === "settings";
}

export function streams_open() {
    return open_overlay_name === "subscriptions";
}

export function lightbox_open() {
    return open_overlay_name === "lightbox";
}

export function drafts_open() {
    return open_overlay_name === "drafts";
}

export function active_modal() {
    if (!is_modal_open()) {
        blueslip.error("Programming error — Called active_modal when there is no modal open");
        return undefined;
    }

    const $micromodal = $(".micromodal.modal--open");
    return `#${CSS.escape($micromodal.attr("id"))}`;
}

export function open_overlay(opts) {
    popovers.hide_all();

    if (!opts.name || !opts.$overlay || !opts.on_close) {
        blueslip.error("Programming error in open_overlay");
        return;
    }

    if ($active_overlay || open_overlay_name || close_handler) {
        blueslip.error(
            "Programming error — trying to open " +
                opts.name +
                " before closing " +
                open_overlay_name,
        );
        return;
    }

    blueslip.debug("open overlay: " + opts.name);

    // Our overlays are kind of crufty...we have an HTML id
    // attribute for them and then a data-overlay attribute for
    // them.  Make sure they match.
    if (opts.$overlay.attr("data-overlay") !== opts.name) {
        blueslip.error("Bad overlay setup for " + opts.name);
        return;
    }

    open_overlay_name = opts.name;
    $active_overlay = opts.$overlay;
    opts.$overlay.addClass("show");

    opts.$overlay.attr("aria-hidden", "false");
    $(".app").attr("aria-hidden", "true");
    $(".fixed-app").attr("aria-hidden", "true");
    $(".header").attr("aria-hidden", "true");

    close_handler = function () {
        opts.on_close();
        reset_state();
    };
}

// If conf.autoremove is true, the modal element will be removed from the DOM
// once the modal is hidden.
// conf also accepts the following optional properties:
// on_show: Callback to run when the modal is triggered to show.
// on_shown: Callback to run when the modal is shown.
// on_hide: Callback to run when the modal is triggered to hide.
// on_hidden: Callback to run when the modal is hidden.
export function open_modal(selector, conf = {}) {
    if (selector === undefined) {
        blueslip.error("Undefined selector was passed into open_modal");
        return;
    }

    // Don't accept hash-based selector to enforce modals to have unique ids and
    // since micromodal doesn't accept hash based selectors.
    if (selector[0] === "#") {
        blueslip.error("hash-based selector passed in to open_modal: " + selector);
        return;
    }

    if (is_modal_open()) {
        blueslip.error("open_modal() was called while " + active_modal() + " modal was open.");
        return;
    }

    blueslip.debug("open modal: " + selector);

    // Micromodal gets elements using the getElementById DOM function
    // which doesn't require the hash. We add it manually here.
    const id_selector = `#${selector}`;
    const $micromodal = $(id_selector);

    $micromodal.find(".modal__container").on("animationend", (event) => {
        const animation_name = event.originalEvent.animationName;
        if (animation_name === "mmfadeIn") {
            // Micromodal adds the is-open class before the modal animation
            // is complete, which isn't really helpful since a modal is open after the
            // animation is complete. So, we manually add a class after the
            // animation is complete.
            $micromodal.addClass("modal--open");
            $micromodal.removeClass("modal--opening");

            if (conf.on_shown) {
                conf.on_shown();
            }
        } else if (animation_name === "mmfadeOut") {
            // Call the on_hidden callback after the modal finishes hiding.

            $micromodal.removeClass("modal--open");
            if (conf.autoremove) {
                $micromodal.remove();
            }
            if (conf.on_hidden) {
                conf.on_hidden();
            }
        }
    });

    Micromodal.show(selector, {
        disableFocus: true,
        openClass: "modal--opening",
        onShow: conf?.on_show,
        onClose: conf?.on_hide,
    });
}

export function close_overlay(name) {
    popovers.hide_all();

    if (name !== open_overlay_name) {
        blueslip.error("Trying to close " + name + " when " + open_overlay_name + " is open.");
        return;
    }

    if (name === undefined) {
        blueslip.error("Undefined name was passed into close_overlay");
        return;
    }

    blueslip.debug("close overlay: " + name);

    $active_overlay.removeClass("show");

    $active_overlay.attr("aria-hidden", "true");
    $(".app").attr("aria-hidden", "false");
    $(".fixed-app").attr("aria-hidden", "false");
    $(".header").attr("aria-hidden", "false");

    if (!close_handler) {
        blueslip.error("Overlay close handler for " + name + " not properly set up.");
        return;
    }

    close_handler();
}

export function close_active() {
    if (!open_overlay_name) {
        blueslip.warn("close_active() called without checking is_active()");
        return;
    }

    close_overlay(open_overlay_name);
}

// `conf` is an object with the following optional properties:
// * on_hidden: Callback to run when the modal finishes hiding.
export function close_modal(selector, conf = {}) {
    if (selector === undefined) {
        blueslip.error("Undefined selector was passed into close_modal");
        return;
    }

    if (!is_modal_open()) {
        blueslip.warn("close_active_modal() called without checking is_modal_open()");
        return;
    }

    if (active_modal() !== `#${selector}`) {
        blueslip.error(
            "Trying to close " + selector + " modal when " + active_modal() + " is open.",
        );
        return;
    }

    blueslip.debug("close modal: " + selector);

    const id_selector = `#${selector}`;
    const $micromodal = $(id_selector);

    // On-hidden hooks should typically be registered in
    // overlays.open_modal.  However, we offer this alternative
    // mechanism as a convenience for hooks only known when
    // closing the modal.
    $micromodal.find(".modal__container").on("animationend", (event) => {
        const animation_name = event.originalEvent.animationName;
        if (animation_name === "mmfadeOut" && conf.on_hidden) {
            conf.on_hidden();
        }
    });

    Micromodal.close(selector);
}

export function close_active_modal() {
    if (!is_modal_open()) {
        blueslip.warn("close_active_modal() called without checking is_modal_open()");
        return;
    }

    const $micromodal = $(".micromodal.modal--open");
    Micromodal.close(`${CSS.escape($micromodal.attr("id"))}`);
}

export function close_for_hash_change() {
    $("div.overlay.show").removeClass("show");
    if ($active_overlay) {
        close_handler();
    }
}

export function open_settings() {
    open_overlay({
        name: "settings",
        $overlay: $("#settings_overlay_container"),
        on_close() {
            browser_history.exit_overlay();
        },
    });
}

export function initialize() {
    $("body").on("click", "div.overlay, div.overlay .exit", (e) => {
        let $target = $(e.target);

        if (document.getSelection().type === "Range") {
            return;
        }

        // if the target is not the div.overlay element, search up the node tree
        // until it is found.
        if ($target.is(".exit, .exit-sign, .overlay-content, .exit span")) {
            $target = $target.closest("[data-overlay]");
        } else if (!$target.is("div.overlay")) {
            // not a valid click target then.
            return;
        }

        if ($target.data("noclose")) {
            // This overlay has been marked explicitly to not be closed.
            return;
        }

        const target_name = $target.attr("data-overlay");

        close_overlay(target_name);

        e.preventDefault();
        e.stopPropagation();
    });
}