-- TODO: rewrite
---@class Mouse
---@field x integer
---@field y integer
---@field pressed boolean
---@field lastPressed boolean
---@field startX integer
---@field startY integer
---@field dragged boolean
---@field lastLine Line?
---@field lastPoint GridPoint?
---@field point GridPoint
Mouse = {
    x = 0,
    y = 0,
    pressed = false,
    lastPressed = false,
    startX = -1,
    startY = -1,
    dragged = false,
    lastLine = nil,
    lastPoint = nil,
    point = GridPoint:new( 0, 0 )
}

-- TODO: fix collision with other line's endpoint
function Mouse:update()
    Mouse.x, Mouse.y = love.mouse.getPosition()
    Mouse.x = Mouse.x + 1
    Mouse.y = Mouse.y + 1
    Mouse.lastPoint = Mouse.point
    Mouse.lastPressed = Mouse.pressed
    Mouse.pressed = love.mouse.isDown( 1 )

    if InMenu then
        return
    end

    Mouse.point = GridPoint.snapCoords( Point:new( Mouse.x, Mouse.y ) )
    if Mouse.lastLine ~= nil then
        local pointsLen = #Mouse.lastLine.points
        local lastLinePoint = Mouse.lastLine.points[pointsLen]
        if Mouse.point:distanceTo( lastLinePoint ) == 1
            and GameGrid:inBounds( Mouse.point )
            and GameGrid:matchesLine( Mouse.point, true ) == nil
            and not lastLinePoint:equals( Mouse.lastLine.endpoint )
            and not GameGrid:isOtherEndpoint( Mouse.lastLine, Mouse.point ) then
            Mouse.lastLine:push( Mouse.point )
        elseif Mouse.lastLine:has( Mouse.point )
            and not Mouse.point:equals( lastLinePoint ) then
            while not Mouse.lastLine.points[#Mouse.lastLine.points]:equals( Mouse.point ) do
                Mouse.lastLine:pop()
            end
        end
    end


    Mouse.dragged = Mouse.pressed
        and Mouse.startX > 0
        and Point.distanceTo (
            Point:new( Mouse.x, Mouse.y ),
            Point:new( Mouse.startX, Mouse.startY )
        ) > Config.dragSensivity

    if not Mouse.pressed and Mouse.startX > 0 then
        Mouse.startX = -1
        Mouse.startY = -1
        Mouse.lastLine = nil
    end

    if not Mouse.lastPressed
        and Mouse.pressed
        and Mouse.startX < 0 then
        Mouse.startX = Mouse.x
        Mouse.startY = Mouse.y
        Mouse.lastLine = GameGrid:matchesLine( Mouse.point, false )
    end

end