Siege of Muldyr - Unit placement and combat logic

lowres_custom_font.p8

-- made for my Lowrezjam2023 entry - Siege of Muldyr!
-- you can read the corresponding devlog on: 
-- kofi article: https://ko-fi.com/post/Siege-Devlog-1--Lowrezjam-2023-How-to-Start-Wh-I2I3O14RM
-- itch devlogs: https://itch.io/t/3057134/siege-devlog-series


function add_defender(unitType, place)
    local unitHealth = {10,10,10,3}
    local isTrapTable = {false, false, false, true}
    local rangeTable = {3, 20, 20, 2}
    local damageCooldownTable = {6, 2, 12, 10}
    local damageTable = {2, 1, 3, 1}
    local unit = {
        unitType = unitType,
        place = place,
        hp = unitHealth[unitType+1],
        isTrap = isTrapTable[unitType+1],
        range = rangeTable[unitType+1],
        damage = damageTable[unitType+1],
        target = vacant,
        damageCooldown = damageCooldownTable[unitType+1]
    }
    defenders[place] = unit
end

function add_enemy(unitType, side)
    local unitHealth = {20,10,10,3}
    local rangeTable = {3, 20, 20, 2}
    local startPos = {0, 64}
    local unit = {
        unitType = unitType,
        side = side,
        x = startPos[side],
        y = 53,
        hp = unitHealth[unitType+1],
        range = rangeTable[unitType+1],
        damageCooldown = 0
    }
    add(enemies, unit)
end


-- inside update we 
for enemy in all(enemies) do
    -- move the nemy depending on
    -- which side it is spawned in
    local movement = {0.2,-0.2}
    enemy.x += movement[enemy.side]

    -- damage cooldown so you cannot hurt them
    -- on each frame
    if enemy.damageCooldown > 0 then
        enemy.damageCooldown -= 1
    end

    -- they despawn and you lose a heart upon them
    -- reaching the castle gate
    if (enemy.x > 32) and (enemy.x < 33) then
        del(enemies, enemy)
        castleHealth -= 1
    end

    -- death on 0 or less hp
    if enemy.hp <= 0 then
        del(enemies, enemy)
    end
end

for defender in all(defenders) do
    -- if there is a defender on the place and not empty
    if defender != vacant then
        -- if it doesn't have a target
        if defender.target == vacant then

            -- find a target and exit
            for enemy in all(enemies) do
                if in_range(defender, enemy) then
                    defender.target = enemy
                    goto found_enemy
                end
            end
            ::found_enemy::
        end

        -- if it has a target
        if defender.target != vacant then
            -- check if it is still in range
            if in_range(defender, defender.target) then
                -- hit it if the cooldown allows
                if (defender.target.damageCooldown <= 0) then
                    defender.target.hp -= defender.damage
                    defender.target.damageCooldown = defender.damageCooldown
                    -- add the floating damage number
                    add_float("-"..defender.damage, defender.target.x, defender.target.y-4, 0, -rnd(), 7, 10)
                    -- hande death here as well
                    if defender.target.hp <= 0 then
                        del(enemies, defender.target)
                        -- if dead set target to vacant
                        defender.target = vacant
                    end
                end
            else
                -- if not in range set to empty to be able to search for new target
                defender.target = vacant
            end
        end
    end
end

function in_range(defender, enemy)
    -- table to declare defender positions
    local pos = {
        {12,53}, {16, 53}, {26,53},
        {39, 53}, {48, 53}, {52, 53},
        {24, 39}, {41, 39}
    }
    defender.x = pos[defender.place][1]
    defender.y = pos[defender.place][2]
    -- simple inside check
    if (enemy.x >= defender.x-defender.range) and (enemy.x <= defender.x+defender.range) and (enemy.y >= defender.y-defender.range) and (enemy.y <= defender.y+defender.range) then
        return true
    else
        return false
    end
end