enemies.lua

---@diagnostic disable: lowercase-global, undefined-global
constants = require 'constants'

ENEMY_SPEED = 100
ENEMY_HP = 10
ENEMY_MANA = 10
ENEMY_COOLDOWN = 2

enemy = {
    x = VIRTUAL_WIDTH / 2 - 25,
    y = 50,
    hp = ENEMY_HP,
    mana = ENEMY_MANA,
    speed = ENEMY_SPEED,
    fireCooldown = ENEMY_COOLDOWN
}

enemiesTable = {}

enemy.direction = 1
enemy.dirTimer = 0

function handleEnemyMovement(dt)
    enemy.dirTimer = enemy.dirTimer - dt

    if enemy.dirTimer <= 0 then
        enemy.direction = (math.random(2) == 1) and -1 or 1
        enemy.speed = math.random(40, 120)
        enemy.dirTimer = math.random() * 2 + 0.5
    end

    enemy.x = enemy.x + enemy.direction * enemy.speed * dt
end

function drawEnemy()
    love.graphics.setColor(RED)
    drawEnemyShip('fill', enemy.x + 25, enemy.y + 10)

    if enemy.x < 50 then
        drawEnemyShip('fill', enemy.x + VIRTUAL_WIDTH + 25, enemy.y + 10)
    elseif enemy.x > VIRTUAL_WIDTH - 50 then
        drawEnemyShip('fill', enemy.x - VIRTUAL_WIDTH + 25, enemy.y + 10)
    end
end

function enemyShoots(enemy, dt)
    enemy.fireCooldown = enemy.fireCooldown - dt
    if enemy.mana <= 0 then
        enemy.mana = ENEMY_MANA
    end

    if enemy.fireCooldown <= 0 and enemy.mana > 0 then
        createEnemyBullet(eBulletsTable, enemy, 314)
        enemy.mana = enemy.mana - 1
        enemy.fireCooldown = 0.5
    end
end

function drawEnemyShip(mode, x, y)
    local w1 = math.atan(2 / 5)
    local w2 = math.atan(5 / 5)
    local k1 = math.sqrt(4 + 25)
    local k2 = math.sqrt(25 + 25)
    local a = 10
    local b = a * math.tan(w1 / 2)
    local c = a * math.tan(k1 / 2)
    local d = a * math.tan(k2 / 2)

    local vertices = {
        a, b, c, d, d, c, b, a,
        -b, a, -d, c, -c, d, -a, b,
        -a, -b, -c, -d, -d, -c, -b, -a,
        b, -a, d, -c, c, -d, a, -b
    }

    love.graphics.push()
    love.graphics.translate(x + 0.4, y + 0.4)
    love.graphics.polygon('line', vertices)
    love.graphics.pop()
end