Mithy

    # Trebuchets - match, prioritize vs catapults+, take into account fort totals
    CUpgradeStructure01 = {
        PriorityFunction = function(unit)
            local priority = 0
            local ourForts = unit:GetAIBrain():GetTeamArmy():GetListOfUnits(categories.FORT, false)
            if ourForts < 2 then
                return 0
            end

            local enemyForts = GetEnemyTeamBrain(unit):GetListOfUnits(categories.FORT, false)
            if EnemyHasUpgrade(unit, 'CTroopNumber04') and not TeamHasUpgrade(unit, 'CTroopNumber04') then
                priority = 15
            elseif EnemyHasUpgrade(unit, 'CUpgradeStructure02') then
                priority = 2 * enemyForts
            end

            return priority * ourForts * GoldThreshold(unit, UpgradeCost('CUpgradeStructure02'))
        end,
    },