------------------------------------------------------------------------------
-- Imports
------------------------------------------------------------------------------

local love = require 'love'
local game_states = require 'src.states'
local Fader = require 'src.fader'


------------------------------------------------------------------------------
-- Variables
------------------------------------------------------------------------------

Current_state = 1
Fade = Fader()
Change_state = false


------------------------------------------------------------------------------
-- Game methods
------------------------------------------------------------------------------

function love.load()
    game_states[Current_state]:load()
    Fade:fade_in()
end


function love.update(dt)
    local new_state = game_states[Current_state]:update(dt)

    -- If the game state changed then trigger a fade out.
    if new_state ~= Current_state and Fade.done then
        Fade:fade_out()
        Change_state = true
    end

    Fade:update(dt)

    -- Update the game state.
    if game_states[new_state] == nil then
        -- If the new state doesn't exist then wait for the fade out to end and quit.
        if Fade.done then
            game_states[Current_state]:unload(dt)
            love.event.quit()
        end
    else
        -- If the new state exists then unload it's data and set the new state.
        if Change_state and Fade.done then
            game_states[Current_state]:unload(dt)
            Current_state = new_state
            game_states[Current_state]:load()
            Change_state = false
            Fade:fade_in()
        end
    end
end


function love.draw()
    love.graphics.clear()
    game_states[Current_state]:draw()
    Fade:draw()
end


function love.keypressed(key)
    -- Send events to the active game state if there is no fade active.
    if Fade.done then
        game_states[Current_state]:keypressed(key)
    end
end


function love.mousemoved(x, y)
    -- Send events to the active game state if there is no fade active.
    if Fade.done then
        game_states[Current_state]:mousemoved(x, y)
    end
end


function love.mousepressed(x, y, btn)
    -- Send events to the active game state if there is no fade active.
    if Fade.done then
        game_states[Current_state]:mousemoved(x, y, btn)
    end
end