LÖVE

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local timer = require 'hump.timer'

local fruits = {"watermelon", "blueberry", "grapes", "lemon", "orange",
                "cherry", "bar", "7", "*"}

local screen = {}
local marks = {}

local finished = true

for i = 1, 3 do
  screen[i] = {}
  marks[i] = {}
end

local function nextRound()
  for i = 1, 3 do
    for j = 1, 4 do
      screen[i][j] = fruits[love.math.random(1, #fruits)]
    end
  end
end

local function matches(a, b, c, d)
  local kind
  if a == "*" then
    if b == "*" then
      if c == "*" then
        return true
      end
      kind = c
    else
      kind = b
    end
  else
    kind = a
  end
  assert(kind)
  return (a == kind or a == '*') and (b == kind or b == '*')
     and (c == kind or c == '*') and (d == kind or d == '*')
end

local function clearMarks()
  for i = 1, 3 do
    for j = 1, 4 do
      marks[i][j] = false
    end
  end
end

local function findLines(wait)
  finished = false
  wait(1)
  for c1 = 1, 3 do
    local fruitC1 = screen[c1][1]
    for c2 = 1, 3 do
      local fruitC2 = screen[c2][2]
      for c3 = 1, 3 do
        local fruitC3 = screen[c3][3]
        for c4 = 1, 3 do
          local fruitC4 = screen[c4][4]
          if matches(fruitC1, fruitC2, fruitC3, fruitC4) then
            marks[c1][1] = true
            marks[c2][2] = true
            marks[c3][3] = true
            marks[c4][4] = true
            wait(2)
            clearMarks()
          end
        end
      end
    end
  end
                
  finished = true
end

function love.update(dt)
  if finished then
    nextRound()
    timer.script(findLines)
  end
  timer.update(dt)
end

function love.draw()
  for i = 1, 3 do
    for j = 1, 4 do
      if marks[i][j] then
        love.graphics.setColor(1, 0, 0)
      else
        love.graphics.setColor(1, 1, 1)
      end
      love.graphics.print(screen[i][j], j * 150, i * 10)
    end
  end
end

function love.keypressed(k) if k == "escape" then return love.event.quit() end end