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import Lean.Data.Json
import Raylean

open Raylean Types

def screenWidth := 1280
def screenHeight := 720

private def initialBallPosition : Vector2 := { x := screenWidth.toFloat / 2, y := screenHeight.toFloat / 2 }

inductive Move where
  | up
  | down
  | left
  | right
  | stay

def updateBallPosition (d : Move) (p : Vector2) : Vector2 := match d with
  | Move.right => { p with x := p.x + 2.0 }
  | Move.left => { p with x := p.x - 2.0 }
  | Move.up => { p with y := p.y - 2.0 }
  | Move.down => { p with y := p.y + 2.0 }
  | Move.stay => p

def getMove : IO Move := do
  if (← isKeyDown Key.right) then return Move.right
     else if (← isKeyDown Key.left) then return Move.left
     else if (← isKeyDown Key.up) then return Move.up
     else if (← isKeyDown Key.down) then return Move.down
     else return Move.stay

def doRender : IO Unit := do
  let mut ballPosition := initialBallPosition
  while not (← windowShouldClose) do
    let d ← getMove
    ballPosition := updateBallPosition d ballPosition
    renderFrame do
      drawFPS (screenWidth - 100) 10
      clearBackground Color.white
      drawText "Move the ball with arrow keys" 10 10 20 Color.blue
      drawCircleV ballPosition 50 Color.red
  closeWindow


structure Vehicle where
  pos : Nat × Nat
  dest : Nat × Nat


inductive Road
  | none
  | low
  | high
deriving Lean.ToJson, Lean.FromJson

structure Point where
  roads : Vector Road 24
  occupant : Option Nat

def Grid h w := Vector (Vector Point w) h

def Tick (g : Grid h w) : Grid h w := Id.run do
  return g


structure State where
  datetime : Std.Time.PlainDateTime
  height : Nat
  width : Nat
  grid : Grid height width
-- deriving Lean.ToJson, Lean.FromJson


def myroad : Road := .low

def serialized := Lean.toJson myroad |>.compress

def blah : Except String Road := Lean.Json.parse serialized >>= Lean.fromJson?


def main : IO Unit := do
  -- This constant is FLAG_WINDOW_HIGHDPI
  -- https://github.com/raysan5/raylib/blob/aaacda6e147031f2af0cfb6c1fd7e64d761ddb1f/src/raylib.h#L567
  setConfigFlags 0x00002000
  initWindow screenWidth screenHeight "LeanTTD"
  setTargetFPS 60
  doRender