-- world module
local world = require("world")

-- love's load function
function love.load()
    -- set the overall map offset
    offset = {
        x = 0,
        y = 0
    }
    
    -- generate the world and load the files
    world.new(10, 10)
    world.loadTiles()
    
    -- store the mouse position
    mouse = {
        x = love.mouse.getX(),
        y = love.mouse.getY()
    }
end

-- love's update function
function love.update(dt)
    -- get the current mouse location
    local mouseNow = {
        x = love.mouse.getX(),
        y = love.mouse.getY()
    }
    
    -- if mouse is pressed move the offset
    if love.mouse.isDown(1) then 
        local mouseDelta = {
            x = mouse.x - mouseNow.x,
            y = mouse.y - mouseNow.y,
        }

        offset.x = offset.x - mouseDelta.x
        offset.y = offset.y - mouseDelta.y
    end

    mouse = mouseNow
end

-- love's key press funciton
function love.keypressed(key, scanCode, isRepeat)
    -- arrow keys for moving offset
    if key == "left"  then
        offset.x = offset.x - 16
    end

    if key == "right" then
        offset.x = offset.x + 16
    end

    if key == "up" then
        offset.y = offset.y - 16
    end
    
    if key == "down" then
        offset.y = offset.y + 16
    end
end

-- love's draw function
function love.draw()
    -- clear the window
    love.graphics.clear()
    
    -- draw the map
    world.render(offset)
end