export const emojis = {
  tree: "🌳",
  rock: "🪨",
  character: "🚶",
  blank: "⬜",
  diamond: "💎",
};

type World = {
  width: number;
  height: number;
  data: string[];
};

type GameObject = {
  x: number;
  y: number;
  emoji: string;
};

type Character = GameObject & {
  inventory: GameObject[];
};

export class GameState {
  private world: World;
  private character: Character;
  private objects: GameObject[] = [];
  private controllers: Set<ReadableStreamDefaultController<string>> = new Set();
  private history: any[] = [];

  constructor() {
    this.initializeGame();
  }

  private initializeGame() {
    const worldWidth = 600;
    const worldHeight = 600;
    this.world = this.createWorld(worldWidth, worldHeight);
    this.world = this.generateTerrain(
      this.world,
      [
        { emoji: "🌳", threshold: 0.4 },
        { emoji: "🪨", threshold: 0.5 },
      ],
      0.1
    );

    const emptyLocation = this.getRandomEmptyLocation(this.world);
    this.character = {
      ...emptyLocation,
      emoji: emojis.character,
      inventory: [],
    };

    // Spawn 500 diamonds at random locations
    for (let i = 0; i < 500; i++) {
      this.spawnAtRandom(emojis.diamond);
    }
  }

  setController(controller: ReadableStreamDefaultController<string>) {
    this.controllers.add(controller);
    try {
      // Send initial state immediately when controller is set
      this.sendUpdate();
    } catch (error) {
      console.error("Error sending initial state:", error);
      this.controllers.delete(controller);
    }
  }

  removeController(controller: ReadableStreamDefaultController<string>) {
    this.controllers.delete(controller);
  }

  getState() {
    return {
      map: this.renderAround(this.world, [this.character, ...this.objects], 6),
      inventory: this.character.inventory.map((item) => item.emoji),
      history: this.history,
    };
  }

  async handleAction(action: any) {
    try {
      if (action.action === "move") {
        this.moveObject(this.character, action.detail, this.world);
        this.history.push({
          role: "assistant",
          content: JSON.stringify(action),
        });
        this.history.push({
          role: "user",
          content: `valid action - input your next action in JSON.\nCurrent map:\n\n${this.renderAround(
            this.world,
            [this.character, ...this.objects],
            5
          )}\n\nInventory: ${this.character.inventory
            .map((item) => item.emoji)
            .join(", ")}`,
        });
      } else if (action.action === "pick") {
        this.pickObject(action.detail);
        this.history.push({
          role: "assistant",
          content: JSON.stringify(action),
        });
        this.history.push({
          role: "user",
          content: `valid action - input your next action in JSON.\nCurrent map:\n\n${this.renderAround(
            this.world,
            [this.character, ...this.objects],
            3
          )}\n\nInventory: ${this.character.inventory
            .map((item) => item.emoji)
            .join(", ")}`,
        });
      }
    } catch (err) {
      this.history.push({
        role: "user",
        content: "This action is invalid. Please try something else.",
      });
    }

    this.sendUpdate();
  }

  private sendUpdate() {
    if (this.controllers.size === 0) return;

    const state = this.getState();
    const data = `data: ${JSON.stringify(state)}\n\n`;

    for (const controller of this.controllers) {
      try {
        controller.enqueue(data);
      } catch (error) {
        console.error("Error sending update to client:", error);
        this.controllers.delete(controller);
      }
    }
  }

  // Helper functions moved from main.js
  private createWorld(width: number, height: number): World {
    return {
      width,
      height,
      data: new Array(width * height).fill(emojis.blank),
    };
  }

  private getIndex(world: World, x: number, y: number): number {
    return y * world.width + x;
  }

  private setTile(world: World, x: number, y: number, tile: string): World {
    const newWorld = { ...world };
    newWorld.data[this.getIndex(newWorld, x, y)] = tile;
    return newWorld;
  }

  private getTile(world: World, x: number, y: number): string {
    return world.data[this.getIndex(world, x, y)];
  }

  private isEmpty(world: World, x: number, y: number): boolean {
    if (x < 0 || y < 0 || x >= world.width || y >= world.height) {
      return false;
    }
    return this.getTile(world, x, y) === emojis.blank;
  }

  private getRandomEmptyLocation(world: World) {
    let x = Math.floor(Math.random() * world.width);
    let y = Math.floor(Math.random() * world.height);

    while (!this.isEmpty(world, x, y)) {
      x = Math.floor(Math.random() * world.width);
      y = Math.floor(Math.random() * world.height);
    }

    return { x, y };
  }

  private moveObject(object: Character, direction: string, world: World) {
    const moveMapping: Record<string, { dx: number; dy: number }> = {
      up: { dx: 0, dy: -1 },
      down: { dx: 0, dy: 1 },
      left: { dx: -1, dy: 0 },
      right: { dx: 1, dy: 0 },
    };

    const movement = moveMapping[direction];
    if (
      movement &&
      this.isEmpty(world, object.x + movement.dx, object.y + movement.dy)
    ) {
      object.x += movement.dx;
      object.y += movement.dy;
    } else {
      throw new Error("invalid action");
    }
  }

  private generateTerrain(
    world: World,
    emojiThresholds: Array<{ emoji: string; threshold: number }>,
    noiseScale: number
  ): World {
    const permutations = this.generatePermutations();
    let newWorld = { ...world };

    for (let y = 0; y < newWorld.height; y++) {
      for (let x = 0; x < newWorld.width; x++) {
        const noiseValue =
          (this.perlin2d(x * noiseScale, y * noiseScale, permutations) + 1) / 2;

        let found = false;
        for (const { emoji, threshold } of emojiThresholds) {
          if (noiseValue < threshold) {
            newWorld = this.setTile(newWorld, x, y, emoji);
            found = true;
            break;
          }
        }

        if (!found) {
          newWorld = this.setTile(newWorld, x, y, emojis.blank);
        }
      }
    }
    return newWorld;
  }

  private generatePermutations(): number[] {
    const p = new Array(256);
    for (let i = 0; i < 256; i++) {
      p[i] = Math.floor(Math.random() * 256);
    }
    return p.concat(p);
  }

  private fade(t: number): number {
    return t * t * t * (t * (t * 6 - 15) + 10);
  }

  private lerp(t: number, a: number, b: number): number {
    return a + t * (b - a);
  }

  private grad(hash: number, x: number, y: number): number {
    const h = hash & 3;
    const u = h < 2 ? x : y;
    const v = h < 2 ? y : x;
    return (h & 1 ? -u : u) + (h & 2 ? -2 * v : 2 * v);
  }

  private perlin2d(x: number, y: number, permutations: number[]): number {
    const X = Math.floor(x) & 255;
    const Y = Math.floor(y) & 255;

    x -= Math.floor(x);
    y -= Math.floor(y);

    const u = this.fade(x);
    const v = this.fade(y);

    const A = permutations[X] + Y;
    const B = permutations[X + 1] + Y;

    return this.lerp(
      v,
      this.lerp(
        u,
        this.grad(permutations[A], x, y),
        this.grad(permutations[B], x - 1, y)
      ),
      this.lerp(
        u,
        this.grad(permutations[A + 1], x, y - 1),
        this.grad(permutations[B + 1], x - 1, y - 1)
      )
    );
  }

  private renderAround(
    world: World,
    objects: GameObject[],
    distance: number
  ): string {
    if (!objects.length) return "No objects to render";
    const mainObject = objects[0]; // Use first object (character) as reference point
    console.log(
      `Rendering around character at (${mainObject.x}, ${mainObject.y}) with ${objects.length} total objects`
    );
    const startPosition = {
      x: mainObject.x - distance,
      y: mainObject.y - distance,
    };

    const areaWidth = 2 * distance + 1;
    const areaHeight = 2 * distance + 1;

    return this.render(world, objects, startPosition, areaWidth, areaHeight);
  }

  public spawnObject(x: number, y: number, emoji: string): GameObject {
    if (!this.isEmpty(this.world, x, y)) {
      throw new Error("Cannot spawn object on non-empty space");
    }

    const newObject: GameObject = { x, y, emoji };
    this.objects.push(newObject);
    this.sendUpdate();
    return newObject;
  }

  public spawnAtRandom(emoji: string): GameObject {
    const location = this.getRandomEmptyLocation(this.world);
    const obj = this.spawnObject(location.x, location.y, emoji);
    console.log(
      `Spawned ${emoji} at (${obj.x}, ${obj.y}). Total objects: ${this.objects.length}`
    );
    return obj;
  }

  private getAdjacentObject(
    x: number,
    y: number,
    direction: string
  ): GameObject | null {
    const moveMapping: Record<string, { dx: number; dy: number }> = {
      up: { dx: 0, dy: -1 },
      down: { dx: 0, dy: 1 },
      left: { dx: -1, dy: 0 },
      right: { dx: 1, dy: 0 },
    };

    const movement = moveMapping[direction];
    if (!movement) return null;

    const targetX = x + movement.dx;
    const targetY = y + movement.dy;

    return (
      this.objects.find((obj) => obj.x === targetX && obj.y === targetY) || null
    );
  }

  private pickObject(direction: string) {
    const object = this.getAdjacentObject(
      this.character.x,
      this.character.y,
      direction
    );

    if (!object) {
      throw new Error("No object found in that direction");
    }

    // Add to inventory
    this.character.inventory.push(object);

    // Remove from world objects
    this.objects = this.objects.filter((obj) => obj !== object);
  }

  private render(
    world: World,
    objects: Character[] = [],
    startPosition = { x: 0, y: 0 },
    areaWidth = world.width,
    areaHeight = world.height
  ): string {
    let output = "";

    for (let y = startPosition.y; y < startPosition.y + areaHeight; y++) {
      for (let x = startPosition.x; x < startPosition.x + areaWidth; x++) {
        if (x >= 0 && y >= 0 && x < world.width && y < world.height) {
          const objectAtPosition = objects.find(
            (obj) => obj.x === x && obj.y === y
          );

          if (objectAtPosition) {
            output += objectAtPosition.emoji;
          } else {
            output += this.getTile(world, x, y);
          }
        } else {
          output += "🪨";
        }
      }
      output += "\n";
    }

    return output;
  }
}