import { lerp } from "./math/lerp.ts";
import { ComplexPath, PathSegment } from "./math/path.ts";
import { Mover } from "./physics/mover.ts";
import { Train, TrainCar } from "./train/train.old.ts";
import { generateSquareTrack, IControlNode, loadFromJson } from "./track.ts";
import { drawLine } from "./drawing/line.ts";
import { initializeDoodler, Vector } from "doodler";

const engineSprites = document.createElement("img");
engineSprites.src = "./sprites/EngineSprites.png";
engineSprites.style.display = "none";
engineSprites.id = "engine-sprites";
document.body.append(engineSprites);

initializeDoodler({
  fillScreen: true,
  bg: "#333",
}, true);

let path;

try {
  path = loadFromJson();
} catch {
  path = generateSquareTrack();
}

const controls = {
  ArrowUp: false,
  ArrowRight: false,
  ArrowDown: false,
  ArrowLeft: false,
};

let t = 0;
let currentSeg = 0;
let speed = 1;

// const trainCount = 1;
// const trains = Array(trainCount).fill(null).map((_, i) => new Train(path.segments[i % path.segments.length], 5));
// const car = new TrainCar(55, engineSprites, 80, 20, {
//   at: new Vector(0, 80),
//   height: 20,
//   width: 80,
// });
const length = Math.floor(Math.random() * 7);
const cars = Array.from(
  { length },
  () =>
    new TrainCar(40, engineSprites, 61, 20, {
      at: new Vector(80, 20 * Math.ceil(Math.random() * 3)),
      width: 61,
      height: 20,
    }),
);
const train = new Train(path, cars);

let dragEndCounter = 0;
let selectedNode: IControlNode | undefined;

doodler.createLayer((_1, _2, _3) => {
  // console.log(_1, _2, _3);
  _1.imageSmoothingEnabled = false;
  const dTime = (_3 < 0 ? 1 : _3) / 1000;
  // console.log(dTime);
  for (let i = 0; i < path.evenPoints.length; i += 10) {
    const p = path.evenPoints[i];
    const next = path.evenPoints[(i + 1) % path.evenPoints.length];
    const last = path.evenPoints.at(i - 1);
    if (!last) break;
    const tan = Vector.sub(last, next);

    doodler.drawRotated(p, tan.heading(), () => {
      doodler.line(p, p.copy().add(0, 10), { color: "#291b17", weight: 4 });
      doodler.line(p, p.copy().add(0, -10), { color: "#291b17", weight: 4 });
      doodler.line(p.copy().add(-6, 5), p.copy().add(6, 5), {
        color: "grey",
        weight: 2,
      });
      doodler.line(p.copy().add(-6, -5), p.copy().add(6, -5), {
        color: "grey",
        weight: 2,
      });
    });
  }
  path.draw();
  train.move(dTime);

  selectedNode?.anchor.drawDot();
  selectedNode?.controls.forEach((e) => e.drawDot());
});

let editable = false;

const clickables = new Map();

let selectedPoint: Vector;

document.addEventListener("keyup", (e) => {
  if (e.key === "d") {
    // console.log(trains)
    // console.log(path.segments.reduce((a,b) => a + b.calculateApproxLength(1000), 0))
    // console.log(path.evenPoints);
  }

  if (e.key === "ArrowUp") {
    // for (const train of trains) {
    //   train.speed += .1;
    // }
    speed += .1;
    train.speed += 1;
  }
  if (e.key === "ArrowDown") {
    // for (const train of trains) {
    //   train.speed -= .1;
    // }
    speed -= .1;
    train.speed -= 1;
  }

  if (e.key === "m" && selectedPoint) {
    const points = path.points;
    const index = points.findIndex((p) => p === selectedPoint);
    if (index > -1) {
      const prev = points.at(index - 1)!;
      const next = points[(index + 1) % points.length];

      const toPrev = Vector.sub(prev, selectedPoint);
      toPrev.setMag(next.dist(selectedPoint));
      toPrev.rotate(Math.PI);
      const toNext = Vector.add(toPrev, selectedPoint);
      next.set(toNext);

      path.calculateApproxLength();
      path.calculateEvenlySpacedPoints(1);
    }
  }
  let translate: boolean = false;

  if (e.key === "e" && !translate) {
    editable = !editable;
    for (const t of path.segments) {
      t.editable = !t.editable;
      for (const p of t.points) {
        if (t.editable) {
          doodler.registerDraggable(p, 10);
          doodler.addDragEvents({
            point: p,
            onDragEnd: () => {
              dragEndCounter++;
              t.length = t.calculateApproxLength(100);
              path.evenPoints = path.calculateEvenlySpacedPoints(1);
            },
            onDrag: (movement) => {
              // todo - remove ! after updating doodler
              path.handleNodeEdit(p, movement!);
            },
          });
        } else {
          doodler.unregisterDraggable(p);
        }
      }
    }
    for (const p of path.points) {
      if (editable) {
        const onClick = () => {
          selectedPoint = p;
          selectedNode = path.nodes.find((e) =>
            e.anchor === p || e.controls.includes(p)
          );
        };

        clickables.set(p, onClick);
        doodler.registerClickable(
          p.copy().sub(10, 10),
          p.copy().add(10, 10),
          onClick,
        );
      } else {
        const the = clickables.get(p);
        doodler.unregisterClickable(the);
      }
    }
  }

  let x = 0;
  let y = 0;
  const onDrag = (e: MouseEvent) => {
    x += e.movementX;
    y += e.movementY;
    console.log("draggin");
  };
  const dragEnd = () => {
    x = 0;
    y = 0;
    for (const t of path.points) {
      t.add(x, y);
    }
  };
  if (e.key === "t" && editable) {
    // translate = !translate;

    // console.log(translate);

    for (const t of path.points) {
      t.add(100, 100);
    }
    path.calculateEvenlySpacedPoints(1);

    // switch (translate) {
    //   case true:
    //     console.log("adding");
    //     ((doodler as any)._canvas as HTMLCanvasElement).addEventListener(
    //       "drag",
    //       onDrag,
    //     );
    //     ((doodler as any)._canvas as HTMLCanvasElement).addEventListener(
    //       "dragend",
    //       dragEnd,
    //     );
    //     break;
    //   case false:
    //     ((doodler as any)._canvas as HTMLCanvasElement).removeEventListener(
    //       "drag",
    //       onDrag,
    //     );
    //     ((doodler as any)._canvas as HTMLCanvasElement).removeEventListener(
    //       "dragend",
    //       dragEnd,
    //     );
    //     break;
    // }
  }
});

// document.addEventListener('keydown', e => {
//   const valid = ["ArrowUp",
//     "ArrowRight",
//     "ArrowDown",
//     "ArrowLeft",]
//   if (valid.includes(e.key))
//     controls[e.key as keyof typeof controls] = true;
// })
// document.addEventListener('keyup', e => {
//   const valid = ["ArrowUp",
//     "ArrowRight",
//     "ArrowDown",
//     "ArrowLeft",]
//   if (valid.includes(e.key))
//     controls[e.key as keyof typeof controls] = false;
// })

// function getSteeringForce(mover: Mover, dir: string) {
//   const dirs = {
//     ArrowUp: 0,
//     ArrowRight: .1 * Math.PI,
//     ArrowDown: Math.PI,
//     ArrowLeft: -.1 * Math.PI,
//   }

//   const target = mover.velocity.copy();
//   target.normalize();
//   target.mult(10);
//   target.rotate(dirs[dir as keyof typeof dirs]);
//   const force = Vector.sub(target, mover.velocity);
//   force.limit(.1)
//   return force;
// }

document.addEventListener("keydown", (e) => {
  if (e.key === "s") {
    e.preventDefault();
    path.segments.forEach((s: any) => {
      s.next = s.next.id;
      s.prev = s.prev.id;
      delete s.ctx;
    });
    delete path.ctx;
    const json = JSON.stringify(path);
    localStorage.setItem("railPath", json);
  }
});