var popovers = (function () {

var exports = {};

var current_actions_popover_elem;
var current_message_info_popover_elem;
var current_message_reactions_popover_elem;
var emoji_map_is_open = false;

var userlist_placement = "right";

var list_of_popovers = [];

// this utilizes the proxy pattern to intercept all calls to $.fn.popover
// and push the $.fn.data($o, "popover") results to an array.
// this is needed so that when we try to unload popovers, we can kill all dead
// ones that no longer have valid parents in the DOM.
(function (popover) {

    $.fn.popover = function () {
        // apply the jQuery object as `this`, and popover function arguments.
        popover.apply(this, arguments);

        // if there is a valid "popover" key in the jQuery data object then
        // push it to the array.
        if (this.data("popover")) {
            list_of_popovers.push(this.data("popover"));
        }
    };

    // add back all shallow properties of $.fn.popover to the new proxied version.
    for (var x in popover) {
        if (popover.hasOwnProperty(x)) {
            $.fn.popover[x] = popover[x];
        }
    }
}($.fn.popover));


function show_message_info_popover(element, id) {
    var last_popover_elem = current_message_info_popover_elem;
    popovers.hide_all();
    if (last_popover_elem !== undefined
        && last_popover_elem.get()[0] === element) {
        // We want it to be the case that a user can dismiss a popover
        // by clicking on the same element that caused the popover.
        return;
    }
    current_msg_list.select_id(id);
    var elt = $(element);
    if (elt.data('popover') === undefined) {
        timerender.set_full_datetime(current_msg_list.get(id),
                                     elt.closest(".message_row").find(".message_time"));

        var message = current_msg_list.get(id);
        var sender = people.get_person_from_user_id(message.sender_id);
        var sender_email;

        if (sender) {
            sender_email = sender.email;
        } else {
            blueslip.debug('Bad sender in message' + message.sender_id);
            sender_email = message.sender_email;
        }

        var args = {
            message:  message,
            sender_email: sender_email,
            pm_with_uri: narrow.pm_with_uri(sender_email),
            sent_by_uri: narrow.by_sender_uri(sender_email),
            narrowed: narrow.active(),
        };

        var ypos = elt.offset().top - viewport.scrollTop();
        elt.popover({
            placement: (ypos > (viewport.height() - 300)) ? 'top' : 'bottom',
            title:     templates.render('message_info_popover_title',   args),
            content:   templates.render('message_info_popover_content', args),
            trigger:   "manual",
        });
        elt.popover("show");
        current_message_info_popover_elem = elt;
    }
}

exports.toggle_reactions_popover = function (element, id) {
    var last_popover_elem = current_message_reactions_popover_elem;
    popovers.hide_all();
    $(element).closest('.message_row').toggleClass('has_popover has_reactions_popover');
    if (last_popover_elem !== undefined
        && last_popover_elem.get()[0] === element) {
        // We want it to be the case that a user can dismiss a popover
        // by clicking on the same element that caused the popover.
        return;
    }

    current_msg_list.select_id(id);
    var elt = $(element);
    if (elt.data('popover') === undefined) {
        var emojis = _.clone(emoji.emojis_name_to_css_class);
        var emojis_used = reactions.get_emojis_used_by_user_for_message_id(id);
        var realm_emojis = emoji.realm_emojis;
        _.each(realm_emojis, function (realm_emoji, realm_emoji_name) {
            emojis[realm_emoji_name] = {
                name: realm_emoji_name,
                is_realm_emoji: true,
                url: realm_emoji.emoji_url,
            };
        });
        _.each(emojis_used, function (emoji_name) {
            var is_realm_emoji = emojis[emoji_name].is_realm_emoji;
            var url = emojis[emoji_name].url;
            emojis[emoji_name] = {
                name: emoji_name,
                has_reacted: true,
                css_class: emoji.emoji_name_to_css_class(emoji_name),
                is_realm_emoji: is_realm_emoji,
                url: url,
            };
        });

        var args = {
            message_id: id,
            emojis: emojis,
        };

        var approx_popover_height = 400;
        var approx_popover_width = 400;
        var distance_from_bottom = viewport.height() - elt.offset().top;
        var distance_from_right = viewport.width() - elt.offset().left;
        var will_extend_beyond_bottom_of_viewport = distance_from_bottom < approx_popover_height;
        var will_extend_beyond_top_of_viewport = elt.offset().top < approx_popover_height;
        var will_extend_beyond_left_of_viewport = elt.offset().left < (approx_popover_width / 2);
        var will_extend_beyond_right_of_viewport = distance_from_right < (approx_popover_width / 2);
        var placement = 'bottom';
        if (will_extend_beyond_bottom_of_viewport && !will_extend_beyond_top_of_viewport) {
            placement = 'top';
        }
        if (will_extend_beyond_right_of_viewport && !will_extend_beyond_left_of_viewport) {
            placement = 'left';
        }
        if (will_extend_beyond_left_of_viewport && !will_extend_beyond_right_of_viewport) {
            placement = 'right';
        }
        elt.prop('title', '');
        elt.popover({
            placement: placement,
            title:     "",
            content:   templates.render('reaction_popover_content', args),
            trigger:   "manual",
        });
        elt.popover("show");
        elt.prop('title', 'Add reaction...');
        $('.reaction-popover-filter').focus();
        current_message_reactions_popover_elem = elt;
    }
};

exports.toggle_actions_popover = function (element, id) {
    var last_popover_elem = current_actions_popover_elem;
    popovers.hide_all();
    $(element).closest('.message_row').toggleClass('has_popover has_actions_popover');
    if (last_popover_elem !== undefined
        && last_popover_elem.get()[0] === element) {
        // We want it to be the case that a user can dismiss a popover
        // by clicking on the same element that caused the popover.
        return;
    }

    current_msg_list.select_id(id);
    var elt = $(element);
    if (elt.data('popover') === undefined) {
        var message = current_msg_list.get(id);
        var editability = message_edit.get_editability(message);
        var use_edit_icon;
        var editability_menu_item;
        if (editability === message_edit.editability_types.FULL) {
            use_edit_icon = true;
            editability_menu_item = i18n.t("Edit");
        } else if (editability === message_edit.editability_types.TOPIC_ONLY) {
            use_edit_icon = false;
            editability_menu_item = i18n.t("View Source / Edit Topic");
        } else {
            use_edit_icon = false;
            editability_menu_item = i18n.t("View Source");
        }
        var can_mute_topic =
                message.stream &&
                message.subject &&
                !muting.is_topic_muted(message.stream, message.subject);
        var can_unmute_topic =
                message.stream &&
                message.subject &&
                muting.is_topic_muted(message.stream, message.subject);

        var should_display_edit_history_option = _.any(message.edit_history, function (entry) {
            return entry.prev_content !== undefined;
        });

        var args = {
            message: message,
            use_edit_icon: use_edit_icon,
            editability_menu_item: editability_menu_item,
            can_mute_topic: can_mute_topic,
            can_unmute_topic: can_unmute_topic,
            should_display_add_reaction_option: message.sent_by_me,
            should_display_edit_history_option: should_display_edit_history_option,
            conversation_time_uri: narrow.by_conversation_and_time_uri(message),
            narrowed: narrow.active(),
        };

        var ypos = elt.offset().top - viewport.scrollTop();
        elt.popover({
            placement: (ypos > (viewport.height() - 300)) ? 'top' : 'bottom',
            title:     "",
            content:   templates.render('actions_popover_content', args),
            trigger:   "manual",
        });
        elt.popover("show");
        current_actions_popover_elem = elt;
    }
};

function get_action_menu_menu_items() {
    return $('li:not(.divider):visible a', current_actions_popover_elem.data('popover').$tip);
}

function focus_first_action_popover_item() {
    // For now I recommend only calling this when the user opens the menu with a hotkey.
    // Our popup menus act kind of funny when you mix keyboard and mouse.
    var items = get_action_menu_menu_items();
    items.eq(0).expectOne().focus();
}

exports.open_message_menu = function () {
    var id = current_msg_list.selected_id();
    popovers.toggle_actions_popover($(".selected_message .actions_hover")[0], id);
    if (current_actions_popover_elem) {
        focus_first_action_popover_item();
    }
    return true;
};

exports.actions_menu_handle_keyboard = function (key) {
    var items = get_action_menu_menu_items();
    var index = items.index(items.filter(':focus'));

    if (key === "enter" && index >= 0 && index < items.length) {
        return items.eq(index).trigger('click');
    }
    if (index === -1) {
        index = 0;
    } else if ((key === 'down_arrow' || key === 'vim_down') && index < items.length - 1) {
        index += 1;
    } else if ((key === 'up_arrow' || key === 'vim_up') && index > 0) {
        index -= 1;
    }
    items.eq(index).focus();
};

exports.actions_popped = function () {
    return current_actions_popover_elem !== undefined;
};

exports.hide_actions_popover = function () {
    if (popovers.actions_popped()) {
        current_actions_popover_elem.popover("destroy");
        current_actions_popover_elem = undefined;
    }
};

function message_info_popped() {
    return current_message_info_popover_elem !== undefined;
}

function reaction_popped() {
    return current_message_reactions_popover_elem !== undefined;
}

exports.hide_message_info_popover = function () {
    if (message_info_popped()) {
        current_message_info_popover_elem.popover("destroy");
        current_message_info_popover_elem = undefined;
    }
};

exports.hide_reactions_popover = function () {
    if (reaction_popped()) {
        current_message_reactions_popover_elem.popover("destroy");
        current_message_reactions_popover_elem = undefined;
    }
};

exports.hide_userlist_sidebar = function () {
    $(".app-main .column-right").removeClass("expanded");
};

exports.hide_pm_list_sidebar = function () {
    $(".app-main .column-left").removeClass("expanded");
};

exports.show_userlist_sidebar = function () {
    $(".app-main .column-right").addClass("expanded");
    resize.resize_page_components();
};

exports.show_pm_list_sidebar = function () {
    $(".app-main .column-left").addClass("expanded");
    resize.resize_page_components();
};

var current_user_sidebar_user_id;
var current_user_sidebar_popover;

function user_sidebar_popped() {
    return current_user_sidebar_popover !== undefined;
}

exports.hide_emoji_map_popover = function () {
    if (emoji_map_is_open) {
        $('.emoji_popover').css('display', 'none');
        $('.drag').css('display', 'none');
        emoji_map_is_open = false;
    }
};

exports.hide_user_sidebar_popover = function () {
    if (user_sidebar_popped()) {
        // this hide_* method looks different from all the others since
        // the presence list may be redrawn. Due to funkiness with jquery's .data()
        // this would confuse $.popover("destroy"), which looks at the .data() attached
        // to a certain element. We thus save off the .data("popover") in the
        // show_user_sidebar_popover and inject it here before calling destroy.
        $('#user_presences').data("popover", current_user_sidebar_popover);
        $('#user_presences').popover("destroy");
        current_user_sidebar_user_id = undefined;
        current_user_sidebar_popover = undefined;
    }
};

function render_emoji_popover() {
    var content = (function () {
        var map = {};
        for (var x in emoji.emojis_name_to_css_class) {
            if (!emoji.realm_emojis[x]) {
                map[x] = {
                    name: x,
                    css_name: emoji.emojis_name_to_css_class[x],
                    url: emoji.emojis_by_name[x],
                };
            }
        }

        return templates.render('emoji_popover_content', {
            emoji_list: map,
            realm_emoji: emoji.realm_emojis,
        });
    }());

    $('.emoji_popover').append(content);

    $('.drag').show();
    $('.emoji_popover').css('display', 'inline-block');

    $("#new_message_content").focus();

    emoji_map_is_open = true;
}

exports.register_click_handlers = function () {
    $("#main_div").on("click", ".actions_hover", function (e) {
        var row = $(this).closest(".message_row");
        e.stopPropagation();
        popovers.toggle_actions_popover(this, rows.id(row));
    });

    $("#main_div").on("click", ".reaction_button", function (e) {
        var row = $(this).closest(".message_row");
        e.stopPropagation();
        popovers.toggle_reactions_popover(this, rows.id(row));
    });


    $("body").on("click", ".actions_popover .reaction_button", function (e) {
        var msgid = $(e.currentTarget).data('message-id');
        e.preventDefault();
        e.stopPropagation();
        // HACK: Because we need the popover to be based off an
        // element that definitely exists in the page even if the
        // message wasn't sent by us and thus the .reaction_hover
        // element is not present, we use the message's
        // .icon-vector-chevron-down element as the base for the popover.
        popovers.toggle_reactions_popover($(".selected_message .icon-vector-chevron-down")[0], msgid);
    });

    $("#main_div").on("click", ".sender_info_hover", function (e) {
        var row = $(this).closest(".message_row");
        e.stopPropagation();
        show_message_info_popover(this, rows.id(row));
    });

    (function () {
        // create locally scoped variables for drag tracking.
        var meta = {
          drag: false,
          c: {
            y: null,
          },
          $popover: $(".emoji_popover"),
          MIN_HEIGHT: 25,
          MAX_HEIGHT: 300,
        };

        // drag must start within the .drag zone.
        $(".drag").on("mousedown", function (e) {
            meta.drag = true;
            meta.c.y = e.screenY;
        });

        // mouse move that originated in .drag zone can go anywhere.
        $("body").on("mousemove", function (e) {
            if (meta.drag) {
                var diff = e.screenY - meta.c.y;
                var resolved_height = meta.$popover.height() - diff;

                if (resolved_height > meta.MIN_HEIGHT && resolved_height < meta.MAX_HEIGHT) {
                  meta.$popover.height(resolved_height);
                }
                meta.c.y = e.screenY;
            }
        });

        // drag ends on mouseup. This cancels all drag events without interfering
        // with any other events.
        $("body").on("mouseup", function () {
            meta.drag = false;
        });
    }());

    $("body").on("click", ".emoji_popover", function (e) {
        e.stopPropagation();
    });

    $(".emoji_popover").on("click", ".emoji", function (e) {
        var emoji_choice = $(e.target).attr("title");
        var textarea = $("#new_message_content");
        textarea.caret(emoji_choice);
        textarea.focus();
        e.stopPropagation();
    });

    $("#compose").on("click", "#emoji_map", function (e) {
        e.preventDefault();
        e.stopPropagation();
        if (emoji_map_is_open) {
            // If the popover is already shown, clicking again should toggle it.
            popovers.hide_emoji_map_popover();
            return;
        }
        popovers.hide_all();
        render_emoji_popover();
    });

    $('body').on('click', '.user_popover .narrow_to_private_messages', function (e) {
        var user_id = $(e.target).parents('ul').attr('data-user-id');
        var email = people.get_person_from_user_id(user_id).email;

        popovers.hide_user_sidebar_popover();
        narrow.by('pm-with', email, {select_first_unread: true, trigger: 'user sidebar popover'});
        e.stopPropagation();
    });

    $('body').on('click', '.user_popover .narrow_to_messages_sent', function (e) {
        var user_id = $(e.target).parents('ul').attr('data-user-id');
        var email = people.get_person_from_user_id(user_id).email;

        popovers.hide_user_sidebar_popover();
        narrow.by('sender', email, {select_first_unread: true, trigger: 'user sidebar popover'});
        e.stopPropagation();
    });

    $('body').on('click', '.user_popover .compose_private_message', function (e) {
        var user_id = $(e.target).parents('ul').attr('data-user-id');
        var email = people.get_person_from_user_id(user_id).email;
        popovers.hide_user_sidebar_popover();

        compose.start('private', {private_message_recipient: email, trigger: 'sidebar user actions'});
        e.stopPropagation();
    });

    $('body').on('click', '.user_popover .mention_user', function (e) {
        var user_id = $(e.target).parents('ul').attr('data-user-id');
        compose.start('stream', {trigger: 'sidebar user actions'});
        var name = people.get_person_from_user_id(user_id).full_name;
        var textarea = $("#new_message_content");
        textarea.val('@**' + name + '** ');
        popovers.hide_user_sidebar_popover();
        e.stopPropagation();
        e.preventDefault();
    });

    $('body').on('click', '.sender_info_popover .narrow_to_private_messages', function (e) {
        var user_id = $(e.target).parents('ul').attr('data-user-id');
        var email = people.get_person_from_user_id(user_id).email;
        narrow.by('pm-with', email, {select_first_unread: true, trigger: 'user sidebar popover'});
        popovers.hide_message_info_popover();
        e.stopPropagation();
        e.preventDefault();
    });

    $('body').on('click', '.sender_info_popover .narrow_to_messages_sent', function (e) {
        var user_id = $(e.target).parents('ul').attr('data-user-id');
        var email = people.get_person_from_user_id(user_id).email;
        narrow.by('sender', email, {select_first_unread: true, trigger: 'user sidebar popover'});
        popovers.hide_message_info_popover();
        e.stopPropagation();
        e.preventDefault();
    });

    $('body').on('click', '.sender_info_popover .mention_user', function (e) {
        compose.respond_to_message({trigger: 'user sidebar popover'});
        var user_id = $(e.target).parents('ul').attr('data-user-id');
        var name = people.get_person_from_user_id(user_id).full_name;
        var textarea = $("#new_message_content");
        textarea.val('@**' + name + '** ');
        popovers.hide_message_info_popover();
        e.stopPropagation();
        e.preventDefault();
    });

    $('#user_presences').on('click', 'span.arrow', function (e) {
        e.stopPropagation();

        // use email of currently selected user, rather than some elem comparison,
        // as the presence list may be redrawn with new elements.
        var target = $(this).closest('li');
        var user_id = target.find('a').attr('data-user-id');
        var name = target.find('a').attr('data-name');

        if (current_user_sidebar_user_id === user_id) {
            // If the popover is already shown, clicking again should toggle it.
            popovers.hide_all();
            return;
        }
        popovers.hide_all();

        if (userlist_placement === "right") {
            popovers.show_userlist_sidebar();
        }
        var template_vars = {user_id: user_id, name: name};
        var content = templates.render('user_sidebar_actions', template_vars);

        target.popover({
            content:   content,
            placement: userlist_placement === "left" ? "right" : "left",
            trigger:   "manual",
            fixed: true,
        });
        target.popover("show");
        current_user_sidebar_user_id = user_id;
        current_user_sidebar_popover = target.data('popover');

    });

    $('body').on('click', '.respond_button', function (e) {
        var textarea = $("#new_message_content");
        var msgid = $(e.currentTarget).data("message-id");

        compose.respond_to_message({trigger: 'popover respond'});
        channel.get({
            url: '/json/messages/' + msgid,
            idempotent: true,
            success: function (data) {
                if (textarea.val() === "") {
                    textarea.val("```quote\n" + data.raw_content +"\n```\n");
                } else {
                    textarea.val(textarea.val() + "\n```quote\n" + data.raw_content +"\n```\n");
                }
                $("#new_message_content").trigger("autosize.resize");
            },
        });
        popovers.hide_actions_popover();
        e.stopPropagation();
        e.preventDefault();
    });
    $('body').on('click', '.respond_personal_button', function (e) {
        compose.respond_to_message({reply_type: 'personal', trigger: 'popover respond pm'});
        popovers.hide_all();
        e.stopPropagation();
        e.preventDefault();
    });
    $('body').on('click', '.popover_narrow_by_id', function (e) {
        var msgid = $(e.currentTarget).data('msgid');
        popovers.hide_actions_popover();
        narrow.by_id(msgid, {trigger: 'popover'});
        e.stopPropagation();
        e.preventDefault();
    });
    $('body').on('click', '.popover_narrow_by_conversation_and_time', function (e) {
        var msgid = $(e.currentTarget).data('message-id');
        popovers.hide_actions_popover();
        narrow.by_conversation_and_time(msgid, {trigger: 'popover'});
        e.stopPropagation();
        e.preventDefault();
    });
    $('body').on('click', '.popover_toggle_collapse', function (e) {
        var msgid = $(e.currentTarget).data('message-id');
        var row = current_msg_list.get_row(msgid);
        var message = current_msg_list.get(rows.id(row));

        popovers.hide_actions_popover();

        if (row) {
            if (message.collapsed) {
                condense.uncollapse(row);
            } else {
                condense.collapse(row);
            }
        }

        e.stopPropagation();
        e.preventDefault();
    });
    $('body').on('click', '.popover_edit_message', function (e) {
        var msgid = $(e.currentTarget).data('message-id');
        var row = current_msg_list.get_row(msgid);
        popovers.hide_actions_popover();
        message_edit.start(row);
        e.stopPropagation();
        e.preventDefault();
    });
    $('body').on('click', '.view_edit_history', function (e) {
        var msgid = $(e.currentTarget).data('msgid');
        var row = current_msg_list.get_row(msgid);
        var message = current_msg_list.get(rows.id(row));

        popovers.hide_actions_popover();
        message_edit.show_history(message);
        e.stopPropagation();
        e.preventDefault();
    });

    $('body').on('click', '.popover_mute_topic', function (e) {
        var stream = $(e.currentTarget).data('msg-stream');
        var topic = $(e.currentTarget).data('msg-topic');
        popovers.hide_actions_popover();
        exports.topic_ops.mute(stream, topic);
        e.stopPropagation();
        e.preventDefault();
    });

    $('body').on('click', '.popover_unmute_topic', function (e) {
        var stream = $(e.currentTarget).data('msg-stream');
        var topic = $(e.currentTarget).data('msg-topic');
        popovers.hide_actions_popover();
        muting_ui.unmute_topic(stream, topic);
        muting_ui.persist_and_rerender();
        e.stopPropagation();
        e.preventDefault();
    });

    (function () {
        var last_scroll = 0;

        $('.app').on('scroll', function () {
            var date = new Date().getTime();

            // only run `popovers.hide_all()` if the last scroll was more
            // than 250ms ago.
            if (date - last_scroll > 250) {
                popovers.hide_all();
            }

            // update the scroll time on every event to make sure it doesn't
            // retrigger `hide_all` while still scrolling.
            last_scroll = date;
        });
    }());

};

exports.any_active = function () {
    // True if any popover (that this module manages) is currently shown.
    return popovers.actions_popped() || user_sidebar_popped() ||
        stream_popover.stream_popped() || stream_popover.topic_popped() ||
        message_info_popped() || emoji_map_is_open ||
        reaction_popped();
};

exports.hide_all = function () {
    $('.has_popover').removeClass('has_popover has_actions_popover has_reactions_popover');
    popovers.hide_actions_popover();
    popovers.hide_message_info_popover();
    popovers.hide_reactions_popover();
    stream_popover.hide_stream_popover();
    stream_popover.hide_topic_popover();
    popovers.hide_user_sidebar_popover();
    popovers.hide_userlist_sidebar();
    stream_popover.restore_stream_list_size();
    popovers.hide_emoji_map_popover();

    // look through all the popovers that have been added and removed.
    list_of_popovers.forEach(function ($o) {
        if (!document.body.contains($o.$element[0]) && $o.$tip) {
            $o.$tip.remove();
        }
    });
};

exports.set_userlist_placement = function (placement) {
    userlist_placement = placement || "right";
};

return exports;
}());

if (typeof module !== 'undefined') {
    module.exports = popovers;
}