const render_announce_stream_docs = require("../templates/announce_stream_docs.hbs");
const render_new_stream_users = require("../templates/new_stream_users.hbs");
const render_subscription_invites_warning_modal = require("../templates/subscription_invites_warning_modal.hbs");

let created_stream;

exports.reset_created_stream = function () {
    created_stream = undefined;
};

exports.set_name = function (stream) {
    created_stream = stream;
};

exports.get_name = function () {
    return created_stream;
};

class StreamSubscriptionError {
    report_no_subs_to_stream() {
        $("#stream_subscription_error").text(
            i18n.t("You cannot create a stream with no subscribers!"),
        );
        $("#stream_subscription_error").show();
    }

    cant_create_stream_without_susbscribing() {
        $("#stream_subscription_error").text(
            i18n.t(
                "You must be an organization administrator to create a stream without subscribing.",
            ),
        );
        $("#stream_subscription_error").show();
    }

    clear_errors() {
        $("#stream_subscription_error").hide();
    }
}
const stream_subscription_error = new StreamSubscriptionError();

class StreamNameError {
    report_already_exists() {
        $("#stream_name_error").text(i18n.t("A stream with this name already exists"));
        $("#stream_name_error").show();
    }

    clear_errors() {
        $("#stream_name_error").hide();
    }

    report_empty_stream() {
        $("#stream_name_error").text(i18n.t("A stream needs to have a name"));
        $("#stream_name_error").show();
    }

    select() {
        $("#create_stream_name").trigger("focus").trigger("select");
    }

    pre_validate(stream_name) {
        // Don't worry about empty strings...we just want to call this
        // to warn users early before they start doing too much work
        // after they make the effort to type in a stream name.  (The
        // use case here is that I go to create a stream, only to find
        // out it already exists, and I was just too lazy to look at
        // the public streams that I'm not subscribed to yet.  Once I
        // realize the stream already exists, I may want to cancel.)
        if (stream_name && stream_data.get_sub(stream_name)) {
            this.report_already_exists();
            return;
        }

        this.clear_errors();
    }

    validate_for_submit(stream_name) {
        if (!stream_name) {
            this.report_empty_stream();
            this.select();
            return false;
        }

        if (stream_data.get_sub(stream_name)) {
            this.report_already_exists();
            this.select();
            return false;
        }

        // If we got this far, then we think we have a new unique stream
        // name, so we'll submit to the server.  (It's still plausible,
        // however, that there's some invite-only stream that we don't
        // know about locally that will cause a name collision.)
        return true;
    }
}
const stream_name_error = new StreamNameError();

// Within the new stream modal...
function update_announce_stream_state() {
    // If there is no notifications_stream, we simply hide the widget.
    if (!stream_data.realm_has_notifications_stream()) {
        $("#announce-new-stream").hide();
        return;
    }

    // If the stream is invite only, disable the "Announce stream" option.
    // Otherwise enable it.
    const announce_stream_checkbox = $("#announce-new-stream input");
    const announce_stream_label = $("#announce-new-stream");
    let disable_it = false;
    const privacy_type = $("input:radio[name=privacy]:checked").val();
    const is_invite_only =
        privacy_type === "invite-only" || privacy_type === "invite-only-public-history";
    announce_stream_label.removeClass("control-label-disabled");

    if (is_invite_only) {
        disable_it = true;
        announce_stream_checkbox.prop("checked", false);
        announce_stream_label.addClass("control-label-disabled");
    }

    announce_stream_checkbox.prop("disabled", disable_it);
    $("#announce-new-stream").show();
}

function get_principals() {
    return Array.from($("#stream_creation_form input:checkbox[name=user]:checked"), (elem) => {
        const label = $(elem).closest(".add-user-label");
        return parseInt(label.attr("data-user-id"), 10);
    });
}

function create_stream() {
    const data = {};
    const stream_name = $("#create_stream_name").val().trim();
    const description = $("#create_stream_description").val().trim();
    created_stream = stream_name;

    // Even though we already check to make sure that while typing the user cannot enter
    // newline characters (by pressing the enter key) it would still be possible to copy
    // and paste over a description with newline characters in it. Prevent that.
    if (description.includes("\n")) {
        ui_report.message(
            i18n.t("The stream description cannot contain newline characters."),
            $(".stream_create_info"),
            "alert-error",
        );
        return;
    }
    data.subscriptions = JSON.stringify([{name: stream_name, description}]);

    let invite_only;
    let history_public_to_subscribers;
    const privacy_setting = $("#stream_creation_form input[name=privacy]:checked").val();

    if (privacy_setting === "invite-only") {
        invite_only = true;
        history_public_to_subscribers = false;
    } else if (privacy_setting === "invite-only-public-history") {
        invite_only = true;
        history_public_to_subscribers = true;
    } else {
        invite_only = false;
        history_public_to_subscribers = true;
    }
    data.invite_only = JSON.stringify(invite_only);
    data.history_public_to_subscribers = JSON.stringify(history_public_to_subscribers);

    const stream_post_policy = parseInt(
        $("#stream_creation_form input[name=stream-post-policy]:checked").val(),
        10,
    );

    data.stream_post_policy = JSON.stringify(stream_post_policy);

    let message_retention_selection = $(
        "#stream_creation_form select[name=stream_message_retention_setting]",
    ).val();
    if (message_retention_selection === "retain_for_period") {
        message_retention_selection = parseInt(
            $("#stream_creation_form input[name=stream-message-retention-days]").val(),
            10,
        );
    }

    data.message_retention_days = JSON.stringify(message_retention_selection);

    const announce =
        stream_data.realm_has_notifications_stream() &&
        $("#announce-new-stream input").prop("checked");
    data.announce = JSON.stringify(announce);

    // TODO: We can eliminate the user_ids -> principals conversion
    //       once we upgrade the backend to accept user_ids.
    const user_ids = get_principals();
    data.principals = JSON.stringify(user_ids);

    loading.make_indicator($("#stream_creating_indicator"), {text: i18n.t("Creating stream...")});

    // Subscribe yourself and possible other people to a new stream.
    return channel.post({
        url: "/json/users/me/subscriptions",
        data,
        success() {
            $("#create_stream_name").val("");
            $("#create_stream_description").val("");
            ui_report.success(i18n.t("Stream successfully created!"), $(".stream_create_info"));
            loading.destroy_indicator($("#stream_creating_indicator"));
            // The rest of the work is done via the subscribe event we will get
        },
        error(xhr) {
            const msg = JSON.parse(xhr.responseText).msg;
            if (msg.includes("access")) {
                // If we can't access the stream, we can safely assume it's
                // a duplicate stream that we are not invited to.
                //
                // BUG: This check should be using error codes, not
                // parsing the error string, so it works correctly
                // with i18n.  And likely we should be reporting the
                // error text directly rather than turning it into
                // "Error creating stream"?
                stream_name_error.report_already_exists(stream_name);
                stream_name_error.trigger("select");
            }

            ui_report.error(i18n.t("Error creating stream"), xhr, $(".stream_create_info"));
            loading.destroy_indicator($("#stream_creating_indicator"));
        },
    });
}

exports.new_stream_clicked = function (stream_name) {
    // this changes the tab switcher (settings/preview) which isn't necessary
    // to a add new stream title.
    $(".display-type #add_new_stream_title").show();
    $(".display-type #stream_settings_title").hide();

    $(".stream-row.active").removeClass("active");

    $("#stream_settings_title, .subscriptions-container .settings, .nothing-selected").hide();
    $("#stream-creation, #add_new_stream_title").show();

    if (stream_name !== "") {
        $("#create_stream_name").val(stream_name);
    }
    exports.show_new_stream_modal();

    // at less than 700px we have a @media query that when you tap the
    // .create_stream_button, the stream prompt slides in. However, when you
    // focus  the button on that page, the entire app view jumps over to
    // the other tab, and the animation breaks.
    // it is unclear whether this is a browser bug or "feature", however what
    // is clear is that this shouldn't be touched unless you're also changing
    // the mobile @media query at 700px.
    if (window.innerWidth > 700) {
        $("#create_stream_name").trigger("focus");
    }
};

function clear_error_display() {
    stream_name_error.clear_errors();
    $(".stream_create_info").hide();
    stream_subscription_error.clear_errors();
}

exports.show_new_stream_modal = function () {
    $("#stream-creation").removeClass("hide");
    $(".right .settings").hide();

    const all_users = people.get_people_for_stream_create();
    // Add current user on top of list
    all_users.unshift(people.get_by_user_id(page_params.user_id));
    const html = render_new_stream_users({
        users: all_users,
        streams: stream_data.get_streams_for_settings_page(),
        is_admin: page_params.is_admin,
    });

    const container = $("#people_to_add");
    container.html(html);
    exports.create_handlers_for_users(container);

    // Make the options default to the same each time:
    // public, "announce stream" on.
    $("#make-invite-only input:radio[value=public]").prop("checked", true);
    $("#stream_creation_form .stream-message-retention-days-input").hide();
    $("#stream_creation_form select[name=stream_message_retention_setting]").val("realm_default");

    if (stream_data.realm_has_notifications_stream()) {
        $("#announce-new-stream").show();
        $("#announce-new-stream input").prop("disabled", false);
        $("#announce-new-stream input").prop("checked", true);
    } else {
        $("#announce-new-stream").hide();
    }
    clear_error_display();

    $("#stream-checkboxes label.checkbox").on("change", function (e) {
        const elem = $(this);
        const stream_id = parseInt(elem.attr("data-stream-id"), 10);
        const checked = elem.find("input").prop("checked");
        const subscriber_ids = stream_data.get_sub_by_id(stream_id).subscribers;

        $("#user-checkboxes label.checkbox").each(function () {
            const user_elem = $(this);
            const user_id = parseInt(user_elem.attr("data-user-id"), 10);

            if (subscriber_ids.has(user_id)) {
                user_elem.find("input").prop("checked", checked);
            }
        });

        e.preventDefault();
    });
};

exports.create_handlers_for_users = function (container) {
    // container should be $('#people_to_add')...see caller to verify
    container.on("change", "#user-checkboxes input", update_announce_stream_state);

    // 'Check all' and 'Uncheck all' visible users
    container.on("click", ".subs_set_all_users", (e) => {
        $("#user-checkboxes .checkbox").each((idx, li) => {
            if (li.style.display !== "none") {
                $(li.firstElementChild).prop("checked", true);
            }
        });
        e.preventDefault();
        update_announce_stream_state();
    });

    container.on("click", ".subs_unset_all_users", (e) => {
        $("#user-checkboxes .checkbox").each((idx, li) => {
            if (li.style.display !== "none") {
                // The first checkbox is the one for ourself; this is the code path for:
                // `stream_subscription_error.cant_create_stream_without_susbscribing`
                if (idx === 0 && !page_params.is_admin) {
                    return;
                }
                $(li.firstElementChild).prop("checked", false);
            }
        });
        e.preventDefault();
        update_announce_stream_state();
    });

    container.on("click", "#copy-from-stream-expand-collapse", (e) => {
        $("#stream-checkboxes").toggle();
        $("#copy-from-stream-expand-collapse .toggle").toggleClass("fa-caret-right fa-caret-down");
        e.preventDefault();
    });

    // Search People or Streams
    container.on("input", ".add-user-list-filter", (e) => {
        const user_list = $(".add-user-list-filter");
        if (user_list === 0) {
            return;
        }
        const search_term = user_list.expectOne().val().trim();
        const search_terms = search_term.toLowerCase().split(",");

        (function filter_user_checkboxes() {
            const user_labels = $("#user-checkboxes label.add-user-label");

            if (search_term === "") {
                user_labels.css({display: "block"});
                return;
            }

            const users = people.get_people_for_stream_create();
            const filtered_users = people.filter_people_by_search_terms(users, search_terms);

            // Be careful about modifying the follow code.  A naive implementation
            // will work very poorly with a large user population (~1000 users).
            //
            // I tested using: `./manage.py populate_db --extra-users 3500`
            //
            // This would break the previous implementation, whereas the new
            // implementation is merely sluggish.
            user_labels.each(function () {
                const elem = $(this);
                const user_id = parseInt(elem.attr("data-user-id"), 10);
                const user_checked = filtered_users.has(user_id);
                const display = user_checked ? "block" : "none";
                elem.css({display});
            });
        })();

        e.preventDefault();
    });
};

exports.set_up_handlers = function () {
    const container = $("#stream-creation").expectOne();

    container.on("change", "#make-invite-only input", update_announce_stream_state);

    container.on("submit", "#stream_creation_form", (e) => {
        e.preventDefault();
        clear_error_display();

        const stream_name = $("#create_stream_name").val().trim();
        const name_ok = stream_name_error.validate_for_submit(stream_name);

        if (!name_ok) {
            return;
        }

        const principals = get_principals();
        if (principals.length === 0) {
            stream_subscription_error.report_no_subs_to_stream();
            return;
        }
        if (!principals.includes(people.my_current_user_id()) && !page_params.is_admin) {
            stream_subscription_error.cant_create_stream_without_susbscribing();
            return;
        }

        if (principals.length >= 50) {
            const invites_warning_modal = render_subscription_invites_warning_modal({
                stream_name,
                count: principals.length,
            });
            $("#stream-creation").append(invites_warning_modal);
        } else {
            create_stream();
        }
    });

    container.on("click", ".close-invites-warning-modal", () => {
        $("#invites-warning-overlay").remove();
    });

    container.on("click", ".confirm-invites-warning-modal", () => {
        create_stream();
        $("#invites-warning-overlay").remove();
    });

    container.on("input", "#create_stream_name", () => {
        const stream_name = $("#create_stream_name").val().trim();

        // This is an inexpensive check.
        stream_name_error.pre_validate(stream_name);
    });

    container.on("mouseover", "#announce-stream-docs", (e) => {
        const announce_stream_docs = $("#announce-stream-docs");
        announce_stream_docs.popover({
            placement: "right",
            content: render_announce_stream_docs({
                notifications_stream: stream_data.get_notifications_stream(),
            }),
            html: true,
            trigger: "manual",
        });
        announce_stream_docs.popover("show");
        announce_stream_docs.data("popover").tip().css("z-index", 2000);
        announce_stream_docs
            .data("popover")
            .tip()
            .find(".popover-content")
            .css("margin", "9px 14px");
        e.stopPropagation();
    });
    container.on("mouseout", "#announce-stream-docs", (e) => {
        $("#announce-stream-docs").popover("hide");
        e.stopPropagation();
    });

    // Do not allow the user to enter newline characters while typing out the
    // stream's description during it's creation.
    container.on("keydown", "#create_stream_description", (e) => {
        if ((e.keyCode || e.which) === 13) {
            e.preventDefault();
        }
    });
};

window.stream_create = exports;