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--UTIL--
function isnumber(value)
  return tonumber(value) and true or false
end

--CHECK--
function tag_check(check_name, check_icon, check_position, return_id)
	log("TAG: " .. serpent.line(check_name) .. " | " .. serpent.line(check_icon))
	if check_icon and check_icon.type == "virtual" and (check_icon.name == "signal-waypoint" or check_icon.name == "signal-orange-dot") then
		return true
	end
	for _, v in pairs(global.tag_catalog) do
		if v.name == check_name and icon_check(v.icon, check_icon) and v.position.x == check_position.x and v.position.y == check_position.y then
			if return_id then
				return _
			else
				return true
			end
		end
	end
	if return_id then
		return nil
	else
		return false
	end
end

--ADD--
function tag_add(unit_name, unit_icon, unit_position)
	if not tag_check(unit_name, unit_icon, unit_position) then
		table.insert(global.tag_catalog, {name = unit_name, icon = unit_icon, position = unit_position})
		--JOURNAL--
		for _, v in pairs(game.players) do
			local scroll_pane = v.gui.screen.tagbook_window_frame.journal_frame.journal_flow.journal_scroll_pane
			journal_add(scroll_pane, unit_name, unit_icon, unit_position)
			--SEARCH--
			local search_text = v.gui.screen.tagbook_window_frame.search_frame.search_flow.search_textfield.text
			local search_icon = v.gui.screen.tagbook_window_frame.search_frame.search_flow.search_elem_button.elem_value
			scroll_pane_search(scroll_pane, search_text, search_icon, elements_position.flow, elements_position.name, elements_position.icon)
			--SORT--
			local switch = v.gui.screen.tagbook_window_frame.search_frame.search_flow.search_switch_button.sprite
			if switch == "tagbook-search-switch-text-button" then
				scroll_pane_sort_by_text(scroll_pane, elements_position.flow, elements_position.name, elements_position.icon)
			else
				scroll_pane_sort_by_icon(scroll_pane, elements_position.flow, elements_position.name, elements_position.icon)
			end
			--EVENT--
			script.raise_event(mod_get_event("catalog_added").id, {name = unit_name, icon = unit_icon, position = unit_position})
			return true
		end
	else
		return false
	end
end

--EDIT--
function tag_edit(unit_name, unit_icon, unit_position, new_name, new_icon)
	local id = tag_check(unit_name, unit_icon, unit_position, true)
	if isnumber(id) then
		global.tag_catalog[id].name = new_name
		global.tag_catalog[id].icon = new_icon
		for _, v in pairs(game.players) do
			local scroll_pane = v.gui.screen.tagbook_window_frame.journal_frame.journal_flow.journal_scroll_pane
			journal_edit(scroll_pane, new_name, new_icon, unit_position, unit_name, unit_icon)
			--SEARCH--
			local search_text = v.gui.screen.tagbook_window_frame.search_frame.search_flow.search_textfield.text
			local search_icon = v.gui.screen.tagbook_window_frame.search_frame.search_flow.search_elem_button.elem_value
			scroll_pane_search(scroll_pane, current_text, current_icon, elements_position.flow, elements_position.name, elements_position.icon)
			--SORT--
			local switch = v.gui.screen.tagbook_window_frame.search_frame.search_flow.search_switch_button.sprite
			if switch == "tagbook-search-switch-text-button" then
				scroll_pane_sort_by_text(scroll_pane, elements_position.flow, elements_position.name, elements_position.icon)
			else
				scroll_pane_sort_by_icon(scroll_pane, elements_position.flow, elements_position.name, elements_position.icon)
			end
		end
		script.raise_event(mod_get_event("catalog_edited").id, {name = new_name, icon = new_icon, position = unit_position, old_name = unit_name, old_icon = unit_icon, current_id = id})
		return true
	else
		return false
	end
end

--REMOVE--
function tag_remove(unit_name, unit_icon, unit_position)
	local id = tag_check(unit_name, unit_icon, unit_position, true)
	if isnumber(id) then
		table.remove(global.tag_catalog, id)
		for _, v in pairs(game.players) do
			local scroll_pane = v.gui.screen.tagbook_window_frame.journal_frame.journal_flow.journal_scroll_pane
			journal_remove(scroll_pane, unit_name, unit_icon, unit_position)
			--SEARCH--
			local search_text = v.gui.screen.tagbook_window_frame.search_frame.search_flow.search_textfield.text
			local search_icon = v.gui.screen.tagbook_window_frame.search_frame.search_flow.search_elem_button.elem_value
			scroll_pane_search(scroll_pane, current_text, current_icon, elements_position.flow, elements_position.name, elements_position.icon)
			--SORT--
			local switch = v.gui.screen.tagbook_window_frame.search_frame.search_flow.search_switch_button.sprite
			if switch == "train-schedule-search-switch-text-button" then
				scroll_pane_sort_by_text(scroll_pane, elements_position.flow, elements_position.name, elements_position.icon)
			else
				scroll_pane_sort_by_icon(scroll_pane, elements_position.flow, elements_position.name, elements_position.icon)
			end
		end
		script.raise_event(mod_get_event("catalog_removed").id, {name = unit_name, icon = unit_icon, position = unit_position, current_id = id})
		return true
	else
		return false
	end
end