require 'gridpoint'

---@enum Alignment
Alignment = {
    Vertical = true,
    Horizontal = false
}

---@enum PortRotation
PortRotation = {
    right = {false, false},
    down = {false, true},
    left = {true, false},
    up = {true, true}
}

---@class Port
---@field position GridPoint
---@field alignment Alignment
---@field scanOffset number
---@field color table
Port = {
    position = GridPoint:new(0, 0),
    alignment = Alignment.Vertical,
    scanOffset = 0,
    color = { 0.8, 0.8, 0, 1 }
}

---@param position GridPoint
---@param rotation PortRotation
---@param color table
---@return Port
function Port:new(position, rotation, color)
    local port = {
        position = position or self.position,
        alignment = self.alignment,
        scanOffset = self.scanOffset,
        color = color or self.color
    }
    if rotation ~= nil then
        port.scanOffset = rotation[1] and 1 or 0
        port.alignment = rotation[2]
    end

    setmetatable(port, { __index = self })

    return port
end

function Port:rotateClockwise()
    self.position.x, self.position.y = -self.position.y, self.position.x
    self.scanOffset = (self.scanOffset == 1) ~= self.alignment and 1 or 0
    self.alignment = not self.alignment
end

---@param offset GridPoint
function Port:draw( offset )
    love.graphics.setColor(self.color)
    local sox = self.alignment and 0 or self.scanOffset
    local soy = self.alignment and self.scanOffset or 0
    
    local drawPoint = GridPoint:new(
        offset.x + self.position.x + sox,
        offset.y + self.position.y + soy
    )
    local x, y = drawPoint:globalCoords()
    x = self.alignment and x or x - Config.portWidth / 2
    y = self.alignment and y - Config.portWidth / 2 or y
    local w = self.alignment and Config.cellSize or Config.portWidth
    local h = self.alignment and Config.portWidth or Config.cellSize
    love.graphics.rectangle("fill", x, y, w, h)
end