main.lua

--[[

Ideas:

- [ ] Different weapons: single fire, alternate fire, double fire, triple fire...
- [ ] Dead enemies sometimes drop a weapons bonus
- [ ] Limit ammo
- [ ] Fuel dynamic: must destroy enemy wave before fuel runs out, and an Il-78 tanker comes to refuel you between attack waves
- [ ] Health dynamic: dead enemies sometimes drop health bonus
- [ ] Increase enemy difficulty after each wave (less stupid, more evasive)
- [ ] Boss fights (F-35, F-22, B-1, B-52, circling Reaper drones)
- [ ] More enemy aircraft (F-14, F-16, F-18, F-117, Mirage-2000, Rafale)
- [ ] Ground fire from SAMs
- [ ] Maverick-like canyon game mode
- [ ] Tu-22 backfire game mode (fighters attacking from behind, SAMs from ahead)
- [ ] Su-25 attack mode (attacking ground targets only)
- [ ] Different terrain (snow, water, desert)
- [.] Menu to select planes, terrain, game mode
- [ ] sounds

--]]
local love = require "love"
Player = require("Player")
Ground = require("Ground")
Air = require("Air")
Menu = require("Menu")
SFX = require("SFX")
HUD = require("HUD")

require "core"

function love.load()
    love.math.setRandomSeed(love.timer.getTime())
    love.graphics.setDefaultFilter("nearest", "nearest", 1)
    love.mouse.setVisible(false)

    _G.losses = 0
    _G.kills = 0
    _G.sfx = SFX()
    _G.player = Player()
    _G.air = Air()
    _G.fonts = {
        medium = love.graphics.newFont("fonts/FreeMono.ttf", 24),
        large = love.graphics.newFont("fonts/FreeMono.ttf", 32),
    }

    _G.planes = {}
    planes["Су-27"] = {
        filename = "sprites/su27-64-camo.png",
        spriteWidth = 64,
        spriteHeight = 64,
    }
    planes["Су-27 «Русские Витязи»"] = {
        filename = "sprites/su27-64.png",
        spriteWidth = 64,
        spriteHeight = 64,
    }
    planes["МиГ-21"] = {
        filename = "sprites/samolet-32.png",
        spriteWidth = 32,
        spriteHeight = 32,
    }
    planes["Ф-15"] = {
        filename = "sprites/f15-64.png",
        spriteWidth = 64,
        spriteHeight = 64,
    }
    planes["Т-4 «Красные Дельфины»"] = {
        filename = "sprites/t-4 red dolphin.png",
        spriteWidth = 64,
        spriteHeight = 64,
    }

    if false then
        player.health = 10000
    end

    for key, val in pairs(planes) do
        val["sprite"] = love.graphics.newImage(val.filename)
    end

    _G.terrain = {}
    terrain["Трава"] = {
        filename = "sprites/green.png",
        spriteWidth = 128,
        spriteHeight = 128,
    }
    terrain["Снег"] = {
        filename = "sprites/snow.png",
        spriteWidth = 128,
        spriteHeight = 128,
    }
    for key, val in pairs(terrain) do
        val["sprite"] = love.graphics.newImage(val.filename)
    end

    --
    -- Nb. the menu/ground needs the above plane and terrain info to be populated
    --
    _G.menu = Menu()
    _G.ground = Ground()
    _G.hud = HUD()

    if false then
        _G.menu.show = false
        local enemy = air:addEnemy()
        enemy.x = love.graphics.getWidth() / 2
        enemy.y = love.graphics.getHeight() / 3
        enemy.speed = 0
        enemy.triggerHappiness = 0
        enemy.stalker = false
        enemy.evasive = false
        enemy.stupid = false
    else
        air:addEnemies(math.random(1, 5))
    end
end

function love.update(dt)
    if menu.show then
        menu:update(dt)
        return
    end

    ground:setTerrain(menu:getCurrentMap())
    ground:update(dt)
    air:update(dt)

    player:morph(menu:getCurrentPlane())

    if player.active then
        player:update(dt)
    else
        --
        -- Keep some enemies on the screen to keep it interesting
        --
        local counter = 0
        for key, enemy in pairs(air.enemies) do
            if enemy and enemy.active then
                counter = counter + 1
            end
        end

        air:addEnemies(5 - counter)

        for key, enemy in pairs(air.enemies) do
            if enemy and enemy.active then
                enemy.stupid = false
                enemy.stalker = false
            end
        end

    end
    if numActive == 0 then
        _G.missiles = {}
    end
end

function love.keypressed(key, scancode, isrepeat)
    if menu.show then
        menu:keypressed(key, scancode, isrepeat)
    elseif key == "escape" then
        sfx:playEffect("ping")
        menu.show = true
    elseif not player.active and key == "return" then
        player:respawn()
    end
end

function love.draw()
    if menu.show then
        menu:draw()
    else
        ground:draw()
        air:draw()
        hud:draw()
    end
end

function destroy(thing)
    local color = {1, 0.85, 0.85}
    if thing == player then
        color = {1, 1, 0.85}
    end

    for k = 1, math.random(1, 5) do
        -- set the center of the explosion to center of the thing that exploded
        local x = thing.x + thing.width * math.random(0.35, 0.65)
        local y = thing.y + thing.height * math.random(0.35, 0.65)
        air:addExplosion(x, y, color)
    end

    if thing == player then
        --
        -- the player leaves a crater closer to the top of the screen, otherwise
        -- we don't see it because of the scrolling
        --
        ground:addCraters(thing.x, thing.y - 750, thing.width / 4)
    else
        ground:addCraters(thing.x, thing.y, thing.width / 4)
    end

    thing.health = 0
    thing.active = false
end