open System.Windows.Forms
open System.Drawing

let f = new Form(Text="Tetris", Width=300, Height=500, TopMost=true)
f.Show()
let bgimg = new Bitmap(@"C:\Users\Alessandro\Desktop\wood_background.jpg")
f.BackgroundImage <- bgimg
f.BackgroundImageLayout <- ImageLayout.Tile

f.MinimumSize <- new Size(370, 50)
let mutable count = 0

type Cell () as this =
    inherit UserControl()
    do this.DoubleBuffered <- true
    do this.BackColor <- Color.Transparent
    let mutable value = 2 //Vuota
        // = 1 -> X
        // = 0 -> O
    let mutable cell_size = 0
    do this.Width <- 100
    do this.Height <- 100
    member this.CellSize
        with get () = cell_size
        and set(v) = cell_size <- v

    member this.Value
        with get() = value
        and set(v) = value <- v

    member this.DrawCross (g:Graphics) =
        let savedGraph = g.Save()
        g.TranslateTransform(float32(cell_size/2), float32(cell_size/2))
        g.RotateTransform(45.f)
        for i = 0 to 4 do
            g.RotateTransform(90.f)
            let p = new Pen(Color.OrangeRed, Width=6.f)
            g.DrawLine(p, 0, 0, cell_size/2, 0)
        g.Restore(savedGraph)

    member this.DrawCircle (g:Graphics)=
        let savedGraph = g.Save()
        g.TranslateTransform(float32(cell_size/2), float32(cell_size/2))
        let p = new Pen(Color.CadetBlue, Width=6.f)
        g.DrawEllipse(p, -cell_size/2 + cell_size/10, -cell_size/2 + cell_size/10, cell_size - cell_size/5, cell_size - cell_size/5)
        g.Restore(savedGraph)

    override this.OnPaint(e) =
        let g = e.Graphics
        if value = 1 then
            this.DrawCross(g)
        else
            this.DrawCircle(g)

    override this.OnClick(e) =
        if this.Value = 2 then
            this.Value <- count % 2
            count <- count+1
            this.Invalidate()


type Grid () as this =
    inherit UserControl()
    do this.DoubleBuffered <- true
    do this.BackColor <- Color.Transparent

    let mutable count = 0
    let lista_celle = [|for i in 1 .. 9 -> new Cell()|]
    let mutable cell_size = 0
    for i in 1 .. 9 ->
        this.Controls.Add(lista_celle[i])

    member this.CellSize
        with get () = cell_size
        and set(v) = cell_size <- v

    override this.OnPaint e =
        let g = e.Graphics
        let savedGraph = g.Save()
        let p = new Pen(Color.White, width=6.f)
        let lenght = this.Width // = this.Height
        g.TranslateTransform(float32(lenght/2), float32(lenght/2) )
        for i = 1 to 4 do
            g.DrawLine(p, -lenght/2, lenght/6, lenght/2, lenght/6)
            g.RotateTransform(90.f)
        g.Restore(savedGraph)

    override this.OnResize e =
        this.CellSize <- this.Width / 5
        this.Invalidate()


let set_grid_size (e:Grid) =
    let width = f.ClientSize.Width
    let height = f.ClientSize.Height
    let cx = width / 2
    let cy = height / 2
    (*Divido ora l'area utile in 10 parti, la griglia occuperà 6/10 di area*)
    let decimo = if width > height then height/10 else width/10
    e.Width <- decimo * 6
    e.Height <- decimo * 6
    e.Location <- Point(cx-(3*decimo), cy-(3*decimo))

let e = new Grid()
set_grid_size e
f.Controls.Add(e)

f.Resize.Add(fun _ ->
    set_grid_size e
    f.Invalidate()
)