import $ from "jquery";
import _ from "lodash";

import render_draft_table_body from "../templates/draft_table_body.hbs";

import * as browser_history from "./browser_history";
import * as compose_actions from "./compose_actions";
import * as drafts from "./drafts";
import {$t} from "./i18n";
import * as messages_overlay_ui from "./messages_overlay_ui";
import * as narrow from "./narrow";
import * as overlays from "./overlays";
import * as people from "./people";
import * as rendered_markdown from "./rendered_markdown";
import * as stream_data from "./stream_data";

function restore_draft(draft_id) {
    const draft = drafts.draft_model.getDraft(draft_id);
    if (!draft) {
        return;
    }

    const compose_args = {...drafts.restore_message(draft), draft_id};

    if (compose_args.type === "stream") {
        if (draft.stream_id !== undefined && draft.topic !== "") {
            narrow.activate(
                [
                    {
                        operator: "stream",
                        operand: stream_data.get_stream_name_from_id(compose_args.stream_id),
                    },
                    {operator: "topic", operand: compose_args.topic},
                ],
                {trigger: "restore draft"},
            );
        }
    } else {
        if (compose_args.private_message_recipient !== "") {
            narrow.activate([{operator: "dm", operand: compose_args.private_message_recipient}], {
                trigger: "restore draft",
            });
        }
    }

    overlays.close_overlay("drafts");
    compose_actions.start(compose_args.type, compose_args);
}

function remove_draft($draft_row) {
    // Deletes the draft and removes it from the list
    const draft_id = $draft_row.data("draft-id");

    drafts.draft_model.deleteDraft(draft_id);

    $draft_row.remove();

    if ($("#drafts_table .overlay-message-row").length === 0) {
        $("#drafts_table .no-drafts").show();
    }
    update_rendered_drafts(
        $("#drafts-from-conversation .overlay-message-row").length > 0,
        $("#other-drafts .overlay-message-row").length > 0,
    );
}

function update_rendered_drafts(has_drafts_from_conversation, has_other_drafts) {
    if (has_drafts_from_conversation) {
        $("#drafts-from-conversation").show();
    } else {
        // Since there are no relevant drafts from this conversation left, switch to the "all drafts" view and remove headers.
        $("#drafts-from-conversation").hide();
        $("#other-drafts-header").hide();
    }

    if (!has_other_drafts) {
        $("#other-drafts").hide();
    }
}

const keyboard_handling_context = {
    get_items_ids() {
        const draft_arrow = drafts.draft_model.get();
        return Object.getOwnPropertyNames(draft_arrow);
    },
    on_enter() {
        // This handles when pressing Enter while looking at drafts.
        // It restores draft that is focused.
        const draft_id_arrow = this.get_items_ids();
        const focused_draft_id = messages_overlay_ui.get_focused_element_id(this);
        if (Object.hasOwn(document.activeElement.parentElement.dataset, "draftId")) {
            restore_draft(focused_draft_id);
        } else {
            const first_draft = draft_id_arrow.at(-1);
            restore_draft(first_draft);
        }
    },
    on_delete() {
        // Allows user to delete drafts with Backspace
        const focused_element_id = messages_overlay_ui.get_focused_element_id(this);
        if (focused_element_id === undefined) {
            return;
        }
        const $focused_row = messages_overlay_ui.row_with_focus(this);
        messages_overlay_ui.focus_on_sibling_element(this);
        remove_draft($focused_row);
    },
    items_container_selector: "drafts-container",
    items_list_selector: "drafts-list",
    row_item_selector: "overlay-message-row",
    box_item_selector: "overlay-message-info-box",
    id_attribute_name: "data-draft-id",
};

export function handle_keyboard_events(event_key) {
    messages_overlay_ui.modals_handle_events(event_key, keyboard_handling_context);
}

export function launch() {
    function format_drafts(data) {
        for (const [id, draft] of Object.entries(data)) {
            draft.id = id;
        }

        const unsorted_raw_drafts = Object.values(data);

        const sorted_raw_drafts = unsorted_raw_drafts.sort(
            (draft_a, draft_b) => draft_b.updatedAt - draft_a.updatedAt,
        );

        const sorted_formatted_drafts = sorted_raw_drafts
            .map((draft_row) => drafts.format_draft(draft_row))
            .filter(Boolean);

        return sorted_formatted_drafts;
    }

    function get_header_for_narrow_drafts() {
        const {stream_name, topic, private_recipients} = drafts.current_recipient_data();
        if (private_recipients) {
            return $t(
                {defaultMessage: "Drafts from conversation with {recipient}"},
                {
                    recipient: people.emails_to_full_names_string(private_recipients.split(",")),
                },
            );
        }
        const recipient = topic ? `#${stream_name} > ${topic}` : `#${stream_name}`;
        return $t({defaultMessage: "Drafts from {recipient}"}, {recipient});
    }

    function render_widgets(narrow_drafts, other_drafts) {
        $("#drafts_table").empty();

        const narrow_drafts_header = get_header_for_narrow_drafts();

        const rendered = render_draft_table_body({
            narrow_drafts_header,
            narrow_drafts,
            other_drafts,
            draft_lifetime: drafts.DRAFT_LIFETIME,
        });
        const $drafts_table = $("#drafts_table");
        $drafts_table.append(rendered);
        if ($("#drafts_table .overlay-message-row").length > 0) {
            $("#drafts_table .no-drafts").hide();
            // Update possible dynamic elements.
            const $rendered_drafts = $drafts_table.find(
                ".message_content.rendered_markdown.restore-overlay-message",
            );
            $rendered_drafts.each(function () {
                rendered_markdown.update_elements($(this));
            });
        }
        update_rendered_drafts(narrow_drafts.length > 0, other_drafts.length > 0);
        update_bulk_delete_ui();
    }

    function setup_event_handlers() {
        $("#drafts_table .restore-overlay-message").on("click", function (e) {
            if (document.getSelection().type === "Range") {
                return;
            }

            e.stopPropagation();

            const $draft_row = $(this).closest(".overlay-message-row");
            const $draft_id = $draft_row.data("draft-id");
            restore_draft($draft_id);
        });

        $("#drafts_table .overlay_message_controls .delete-overlay-message").on(
            "click",
            function () {
                const $draft_row = $(this).closest(".overlay-message-row");

                remove_draft($draft_row);
                update_bulk_delete_ui();
            },
        );

        $("#drafts_table .overlay_message_controls .draft-selection-checkbox").on("click", (e) => {
            const is_checked = is_checkbox_icon_checked($(e.target));
            toggle_checkbox_icon_state($(e.target), !is_checked);
            update_bulk_delete_ui();
        });

        $(".select-drafts-button").on("click", (e) => {
            e.preventDefault();
            const $unchecked_checkboxes = $(".draft-selection-checkbox").filter(function () {
                return !is_checkbox_icon_checked($(this));
            });
            const check_boxes = $unchecked_checkboxes.length > 0;
            $(".draft-selection-checkbox").each(function () {
                toggle_checkbox_icon_state($(this), check_boxes);
            });
            update_bulk_delete_ui();
        });

        $(".delete-selected-drafts-button").on("click", () => {
            $(".drafts-list")
                .find(".draft-selection-checkbox.fa-check-square")
                .closest(".overlay-message-row")
                .each(function () {
                    remove_draft($(this));
                });
            update_bulk_delete_ui();
        });
    }

    const all_drafts = drafts.draft_model.get();
    const narrow_drafts = drafts.filter_drafts_by_compose_box_and_recipient(all_drafts);
    const other_drafts = _.pick(
        all_drafts,
        _.difference(Object.keys(all_drafts), Object.keys(narrow_drafts)),
    );
    const formatted_narrow_drafts = format_drafts(narrow_drafts);
    const formatted_other_drafts = format_drafts(other_drafts);

    render_widgets(formatted_narrow_drafts, formatted_other_drafts);

    // We need to force a style calculation on the newly created
    // element in order for the CSS transition to take effect.
    $("#draft_overlay").css("opacity");

    open_overlay();
    const first_element_id = [...formatted_narrow_drafts, ...formatted_other_drafts][0]?.draft_id;
    messages_overlay_ui.set_initial_element(first_element_id, keyboard_handling_context);
    setup_event_handlers();
}

export function update_bulk_delete_ui() {
    const $unchecked_checkboxes = $(".draft-selection-checkbox").filter(function () {
        return !is_checkbox_icon_checked($(this));
    });
    const $checked_checkboxes = $(".draft-selection-checkbox").filter(function () {
        return is_checkbox_icon_checked($(this));
    });
    const $select_drafts_button = $(".select-drafts-button");
    const $select_state_indicator = $(".select-drafts-button .select-state-indicator");
    const $delete_selected_drafts_button = $(".delete-selected-drafts-button");

    if ($checked_checkboxes.length > 0) {
        $delete_selected_drafts_button.prop("disabled", false);
        if ($unchecked_checkboxes.length === 0) {
            toggle_checkbox_icon_state($select_state_indicator, true);
        } else {
            toggle_checkbox_icon_state($select_state_indicator, false);
        }
    } else {
        if ($unchecked_checkboxes.length > 0) {
            toggle_checkbox_icon_state($select_state_indicator, false);
            $delete_selected_drafts_button.prop("disabled", true);
        } else {
            $select_drafts_button.hide();
            $delete_selected_drafts_button.hide();
        }
    }
}

export function open_overlay() {
    drafts.sync_count();
    overlays.open_overlay({
        name: "drafts",
        $overlay: $("#draft_overlay"),
        on_close() {
            browser_history.exit_overlay();
            drafts.sync_count();
        },
    });
}

export function is_checkbox_icon_checked($checkbox) {
    return $checkbox.hasClass("fa-check-square");
}

export function toggle_checkbox_icon_state($checkbox, checked) {
    $checkbox.parent().attr("aria-checked", checked);
    if (checked) {
        $checkbox.removeClass("fa-square-o").addClass("fa-check-square");
    } else {
        $checkbox.removeClass("fa-check-square").addClass("fa-square-o");
    }
}

export function initialize() {
    $("body").on("focus", "#drafts_table .overlay-message-info-box", (e) => {
        messages_overlay_ui.activate_element(e.target, keyboard_handling_context);
    });
}