import { mkdtemp, readFile, stat } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { describe, expect, it } from "vitest";
import { createEngine } from "@nengine/core";
import { newProject, sanitizeId } from "../src/template.js";

async function tmpDir(): Promise<string> {
  return mkdtemp(join(tmpdir(), "editor-template-"));
}

describe("sanitizeId", () => {
  it("slugs names and falls back for empty input", () => {
    expect(sanitizeId("My Farm!")).toBe("my-farm");
    expect(sanitizeId("  山谷 农场")).toBe("farm");
    expect(sanitizeId("")).toBe("farm");
    expect(sanitizeId("Turnip_Vale")).toBe("turnipvale");
  });
});

describe("newProject", () => {
  it("generates the full template tree", async () => {
    const dir = await tmpDir();
    try {
      const project = await newProject("Test Farm", dir);
      expect(project.hasContent).toBe(true);
      expect(project.hasMods).toBe(true);
      const expected = [
        "content/time.yaml",
        "content/weather.yaml",
        "content/interact.yaml",
        "content/maps/test-farm.yaml",
        "content/items/hoe.yaml",
        "content/items/test-farm-seed.yaml",
        "content/items/test-farm.yaml",
        "content/crops/test-farm.yaml",
        "content/scenes/test-farm.yaml",
      ];
      for (const rel of expected) {
        await expect(stat(join(dir, rel))).resolves.toBeDefined();
      }
      await expect(stat(join(dir, "mods"))).resolves.toBeDefined();
    } finally {
      await rmRecursive(dir);
    }
  });

  it("boots the generated project through createEngine", async () => {
    const dir = await tmpDir();
    try {
      const project = await newProject("Boot Farm", dir);
      const engine = createEngine({ contentDir: join(project.root, "content") });
      await engine.start();
      try {
        expect(engine.world.get("player")).toMatchObject({ id: "player", type: "player", x: 8, y: 8 });
        const mapEntity = engine.world.query({ type: "map" })[0];
        expect(mapEntity?.id).toBe("boot-farm");
        const scenes = engine.registry.list("scene");
        expect(scenes).toHaveLength(1);
        expect(scenes[0]?.id).toBe("boot-farm");
        const crops = engine.registry.list("crop");
        expect(crops[0]?.seedItem).toBe("boot-farm-seed");
        expect(engine.registry.list("time")).toHaveLength(1);
        expect(engine.registry.list("weather")).toHaveLength(1);
      } finally {
        await engine.stop();
      }
    } finally {
      await rmRecursive(dir);
    }
  });

  it("interpolates the sanitized name into file ids", async () => {
    const dir = await tmpDir();
    try {
      await newProject("Valley View", dir);
      const crop = await readFile(join(dir, "content/crops/valley-view.yaml"), "utf8");
      expect(crop).toContain("id: valley-view");
      expect(crop).toContain("seedItem: valley-view-seed");
      const scene = await readFile(join(dir, "content/scenes/valley-view.yaml"), "utf8");
      expect(scene).toContain("entities: []");
    } finally {
      await rmRecursive(dir);
    }
  });
});

async function rmRecursive(dir: string): Promise<void> {
  const { rm } = await import("node:fs/promises");
  await rm(dir, { recursive: true, force: true });
}

describe("template map layout", () => {
  it("lays out grass, water, and tilled tiles correctly", async () => {
    const dir = await tmpDir();
    try {
      await newProject("Layout", dir);
      const { parse } = await import("yaml");
      const map = parse(await readFile(join(dir, "content/maps/layout.yaml"), "utf8")) as {
        width: number;
        height: number;
        spawn: { x: number; y: number };
        layers: { data: string[][] }[];
      };
      expect(map.width).toBe(12);
      expect(map.height).toBe(12);
      const data = map.layers[0]?.data ?? [];
      expect(data[0]?.[0]).toBe("water");
      expect(data[2]?.[2]).toBe("water");
      expect(data[4]?.[4]).toBe("tilled");
      expect(data[5]?.[7]).toBe("tilled");
      expect(data[11]?.[11]).toBe("grass");
      expect(data[map.spawn.y]?.[map.spawn.x]).toBe("grass");
    } finally {
      await rmRecursive(dir);
    }
  });
});