require 'vec2'

Player = {}
Player.name = 'player'
Player.color = {255, 0, 0}
Player.width = 5
Player.height = 5
Player.acceleration = 100
Player.position = vec2:new(0, 0)
Player.vector = vec2:new(0, 0)
Player.path = {}
Player.vectors = {
    up    = vec2:new(0, -1),
    down  = vec2:new(0, 1),
    left  = vec2:new(-1, 0),
    right = vec2:new(1, 0),
    }
Player.keys = {
    w = 'up',
    s = 'down',
    a = 'left',
    d = 'right',
    }

function Player:new(o)
    o = o or {}
    setmetatable(o, self)
    self.__index = self
    o:recordPosition()
    return o
end

function Player:drawPath()
    if #self.path >= 4 then
        love.graphics.setColor(self.color)
        love.graphics.line(self.path)
    end
end

function Player:draw()
    love.graphics.setColor(self.color)
    love.graphics.rectangle('fill', self.position.x, self.position.y, self.width, self.height)

    -- add current position
    self:recordPosition()
    self:drawPath()
    table.remove(self.path)
    table.remove(self.path)
end

function Player:recordPosition()
    table.insert(self.path, self.position.x + self.width/2)
    table.insert(self.path, self.position.y + self.height/2)
end

function Player:update(dt)
    for key, name in pairs(self.keys) do
        if love.keyboard.isDown(key)
        and self.vector ~= self.vectors[name]
        and (self.vector + self.vectors[name]):length() > 0
        then
            self.vector = self.vectors[name]
            self:recordPosition()
            break
        end
    end
    self.position = self.position + self.vector * self.acceleration * dt
end