import { describe, expect, test } from "bun:test";
import { mkdir, mkdtemp, rm, symlink, writeFile } from "node:fs/promises";
import { join } from "node:path";
import { tmpdir } from "node:os";
import { LocalWorkspaceFiles, LocalWorkspaceResolver } from ".";

describe("LocalWorkspaceResolver", () => {
  test("只接受实际存在且可读写的绝对目录", async () => {
    const root = await mkdtemp(join(tmpdir(), "great-agent-workspace-"));
    try {
      const resolver = new LocalWorkspaceResolver();
      expect(await resolver.resolveForCreation(root)).toContain(
        "great-agent-workspace-",
      );
      expect(await resolver.isAvailable(root)).toBe(true);
      expect(
        resolver.resolveForCreation("relative/path"),
      ).rejects.toMatchObject({ code: "WORKSPACE_PATH_NOT_ABSOLUTE" });
    } finally {
      await rm(root, { recursive: true });
    }
  });
});

describe("LocalWorkspaceFiles", () => {
  test("列出、搜索并读取工作区文本", async () => {
    const root = await mkdtemp(join(tmpdir(), "great-agent-files-"));
    try {
      await mkdir(join(root, "docs"));
      await writeFile(
        join(root, "docs", "说明.md"),
        "第一行\n需要搜索的内容\n",
      );
      const files = new LocalWorkspaceFiles();
      expect(await files.list(root)).toEqual([
        { path: "docs", name: "docs", kind: "directory" },
      ]);
      expect((await files.search(root, "搜索"))[0]).toMatchObject({
        path: "docs/说明.md",
        line: 2,
        matchedBy: "content",
      });
      expect((await files.readText(root, "docs/说明.md")).content).toContain(
        "第一行",
      );
    } finally {
      await rm(root, { recursive: true });
    }
  });

  test("拒绝绝对路径、父目录跳转和符号链接逃逸", async () => {
    const root = await mkdtemp(join(tmpdir(), "great-agent-safe-"));
    const outside = await mkdtemp(join(tmpdir(), "great-agent-outside-"));
    try {
      await writeFile(join(outside, "secret.txt"), "secret");
      await symlink(join(outside, "secret.txt"), join(root, "shortcut.txt"));
      await symlink(outside, join(root, "outside-directory"));
      const files = new LocalWorkspaceFiles();
      await expect(files.readText(root, "../secret.txt")).rejects.toMatchObject(
        {
          code: "WORKSPACE_PATH_FORBIDDEN",
        },
      );
      await expect(
        files.readText(root, join(outside, "secret.txt")),
      ).rejects.toMatchObject({
        code: "WORKSPACE_PATH_FORBIDDEN",
      });
      await expect(files.readText(root, "shortcut.txt")).rejects.toMatchObject({
        code: "WORKSPACE_PATH_FORBIDDEN",
      });
      await expect(
        files.createText(root, "outside-directory/new.txt", "escape"),
      ).rejects.toMatchObject({ code: "WORKSPACE_PATH_FORBIDDEN" });
    } finally {
      await rm(root, { recursive: true });
      await rm(outside, { recursive: true });
    }
  });

  test("二进制文件返回明确的不支持状态", async () => {
    const root = await mkdtemp(join(tmpdir(), "great-agent-binary-"));
    try {
      await writeFile(join(root, "image.bin"), new Uint8Array([1, 0, 2]));
      const files = new LocalWorkspaceFiles();
      expect((await files.inspect(root, "image.bin")).readableAsText).toBe(
        false,
      );
      await expect(files.readText(root, "image.bin")).rejects.toMatchObject({
        code: "FILE_TYPE_UNSUPPORTED",
      });
    } finally {
      await rm(root, { recursive: true });
    }
  });

  test("排他创建并使用内容哈希安全修改文本", async () => {
    const root = await mkdtemp(join(tmpdir(), "great-agent-write-"));
    try {
      const files = new LocalWorkspaceFiles();
      const created = await files.createText(root, "notes.txt", "旧内容\n");
      expect(created.path).toBe("notes.txt");
      expect(created.hash).toHaveLength(64);
      await expect(
        files.createText(root, "notes.txt", "不能覆盖"),
      ).rejects.toMatchObject({ code: "FILE_ALREADY_EXISTS" });
      const changed = await files.applyTextPatch(
        root,
        "notes.txt",
        created.hash,
        [{ oldText: "旧内容", newText: "新内容" }],
      );
      expect(changed.hash).not.toBe(created.hash);
      expect((await files.readText(root, "notes.txt")).content).toBe(
        "新内容\n",
      );
      await expect(
        files.applyTextPatch(root, "notes.txt", created.hash, [
          { oldText: "新内容", newText: "危险覆盖" },
        ]),
      ).rejects.toMatchObject({ code: "FILE_CHANGED" });
    } finally {
      await rm(root, { recursive: true });
    }
  });

  test("修改目标缺失或不唯一时不写文件", async () => {
    const root = await mkdtemp(join(tmpdir(), "great-agent-patch-"));
    try {
      await writeFile(join(root, "repeat.txt"), "相同\n相同\n");
      const files = new LocalWorkspaceFiles();
      const current = await files.readText(root, "repeat.txt");
      await expect(
        files.applyTextPatch(root, "repeat.txt", current.hash, [
          { oldText: "不存在", newText: "内容" },
        ]),
      ).rejects.toMatchObject({ code: "PATCH_TARGET_NOT_FOUND" });
      await expect(
        files.applyTextPatch(root, "repeat.txt", current.hash, [
          { oldText: "相同", newText: "内容" },
        ]),
      ).rejects.toMatchObject({ code: "PATCH_TARGET_AMBIGUOUS" });
      expect((await files.readText(root, "repeat.txt")).content).toBe(
        "相同\n相同\n",
      );
    } finally {
      await rm(root, { recursive: true });
    }
  });
});