import { chownSync, mkdtempSync, readFileSync, rmSync } from "node:fs";
import os from "node:os";
import path from "node:path";
import { signGithubBrokerRunToken } from "@rakazo/core/node/github-broker-token";
import { describe, expect, it } from "vitest";
import {
  explainGitFailure,
  type GithubBrokerSession,
  githubBrokerSessionsForTests,
  githubHttpsRemote,
  gitProcessIdentity,
  hostGitInvocation,
  hostPathFor,
} from "./github-broker.js";
import {
  demuxDockerLogs,
  helperContainerOptions,
  readMountPoints,
  visibleThroughMounts,
} from "./github-broker-helper.js";
import { hasValidBearerToken } from "./supervisor-logic.js";

const session: GithubBrokerSession = {
  runId: "run-a",
  workspacePath: "/srv/homes/chief",
  allowedRemoteUrl: null,
  defaultBranch: "main",
  githubToken: "ghp_test",
  containerRoot: "/home/rakazo",
  pushApproved: false,
};

describe("github broker sessions", () => {
  it("stores sessions for supervisor-authenticated registration", () => {
    const token = "supervisor-test-token";
    expect(hasValidBearerToken(`Bearer ${token}`, token)).toBe(true);
    githubBrokerSessionsForTests().set("run-a", {
      ...session,
      workspacePath: "/tmp/project",
      allowedRemoteUrl: "https://github.com/example/demo.git",
    });
    const runToken = signGithubBrokerRunToken("run-a", token);
    expect(runToken.startsWith("rgb1.")).toBe(true);
    githubBrokerSessionsForTests().delete("run-a");
  });
});

describe("github broker host git", () => {
  it("maps computer paths onto the host workspace", () => {
    expect(hostPathFor(session, "/home/rakazo")).toBe("/srv/homes/chief");
    expect(hostPathFor(session, "/home/rakazo/repos/demo")).toBe("/srv/homes/chief/repos/demo");
    expect(hostPathFor(session, "/home/rakazo/../etc")).toBeNull();
    expect(hostPathFor(session, "/tmp")).toBeNull();
    expect(hostPathFor(session, "/home/rakazoX")).toBeNull();
  });

  it("clones where the agent stands, with the token supplied as a git credential", () => {
    const invocation = hostGitInvocation(
      session,
      ["git", "clone", "https://github.com/example/demo.git", "/home/rakazo/repos/demo"],
      "/home/rakazo/repos",
    );
    if ("error" in invocation) throw new Error(invocation.error);
    expect(invocation.cwd).toBe("/srv/homes/chief/repos");
    expect(invocation.argv[0]).toBe("/usr/bin/git");
    expect(invocation.argv).toContain("credential.helper=");
    expect(invocation.argv.slice(-3)).toEqual([
      "clone",
      "https://github.com/example/demo.git",
      "/srv/homes/chief/repos/demo",
    ]);
    expect(invocation.argv.join(" ")).not.toContain("ghp_test");
  });

  it("refuses paths outside the mounted workspace", () => {
    expect(hostGitInvocation(session, ["git", "clone", "https://x/y.git"], "/tmp")).toEqual({
      error: "Run git inside /home/rakazo.",
    });
    expect(
      hostGitInvocation(session, ["git", "clone", "https://x/y.git", "/etc/y"], "/home/rakazo"),
    ).toEqual({ error: "Use a path inside /home/rakazo." });
  });
});

describe("github broker remotes", () => {
  it("sends GitHub remotes over HTTPS without pasted credentials", () => {
    expect(githubHttpsRemote("git@github.com:example/demo.git")).toBe(
      "https://github.com/example/demo.git",
    );
    expect(githubHttpsRemote("ssh://git@github.com/example/demo")).toBe(
      "https://github.com/example/demo",
    );
    expect(githubHttpsRemote("https://x-access-token:rgb1.abc@github.com/example/demo.git")).toBe(
      "https://github.com/example/demo.git",
    );
    expect(githubHttpsRemote("https://gitlab.com/example/demo.git")).toBe(
      "https://gitlab.com/example/demo.git",
    );
    expect(githubHttpsRemote("--depth=1")).toBe("--depth=1");
  });

  it("points a rejected token at reconnecting GitHub", () => {
    expect(explainGitFailure("remote: Invalid username or token.\n")).toContain(
      "reconnect GitHub under Settings, Integrations",
    );
    expect(explainGitFailure("fatal: repository not found\n")).toBe(
      "fatal: repository not found\n",
    );
  });
});

describe("github broker host tools", () => {
  it("ships git and gh in the supervisor image", () => {
    const dockerfile = readFileSync(path.join(import.meta.dirname, "../Dockerfile"), "utf8");
    expect(dockerfile).toMatch(/apt-get install[^\n]* gh git/);
  });

  it("runs git as the workspace owner only from a root supervisor", () => {
    const workspace = mkdtempSync(path.join(os.tmpdir(), "broker-owner-"));
    try {
      expect(gitProcessIdentity(workspace, 1000)).toBeUndefined();
      expect(gitProcessIdentity(path.join(workspace, "missing"), 0)).toBeUndefined();
      if (process.getuid?.() === 0) {
        chownSync(workspace, 1000, 1000);
        expect(gitProcessIdentity(workspace, 0)).toEqual({ uid: 1000, gid: 1000 });
      }
    } finally {
      rmSync(workspace, { recursive: true, force: true });
    }
  });
});

describe("github broker helper container", () => {
  const mounts = readMountPoints(
    [
      "1 0 0:1 / / rw - overlay overlay rw",
      "2 1 0:2 /srv/data /srv/data rw - ext4 /dev/sda1 rw",
      "3 1 0:3 / /var/run/docker.sock rw - tmpfs tmpfs rw",
    ].join("\n"),
  );

  it("sees only paths below the supervisor's own mounts", () => {
    expect(mounts).toEqual(["/", "/srv/data", "/var/run/docker.sock"]);
    expect(visibleThroughMounts("/srv/data/homes/chief", mounts)).toBe(true);
    // The parent of a bind mount exists in the container but is empty.
    expect(visibleThroughMounts("/srv", mounts)).toBe(false);
    expect(visibleThroughMounts("/home/owner/Projects/app", mounts)).toBe(false);
  });

  it("binds the workspace and runs the computer image's real binary", () => {
    const options = helperContainerOptions(
      {
        argv: ["/usr/bin/git", "push", "origin", "fix"],
        cwd: "/home/owner/Projects/app",
        env: { GITHUB_TOKEN: "ghp_test" },
        workspacePath: "/home/owner/Projects/app",
      },
      "rakazo/computer:local",
      "1000:1000",
    );
    expect(options).toMatchObject({
      Image: "rakazo/computer:local",
      Entrypoint: ["/usr/local/libexec/rakazo/git"],
      Cmd: ["push", "origin", "fix"],
      WorkingDir: "/home/owner/Projects/app",
      User: "1000:1000",
      Env: ["GITHUB_TOKEN=ghp_test"],
      HostConfig: { Binds: ["/home/owner/Projects/app:/home/owner/Projects/app"] },
    });
  });

  it("splits Docker's multiplexed output into stdout and stderr", () => {
    const frame = (stream: number, text: string) => {
      const header = Buffer.alloc(8);
      header[0] = stream;
      header.writeUInt32BE(Buffer.byteLength(text), 4);
      return Buffer.concat([header, Buffer.from(text)]);
    };
    expect(
      demuxDockerLogs(Buffer.concat([frame(1, "out"), frame(2, "err"), frame(1, "!")])),
    ).toEqual({ stdout: "out!", stderr: "err" });
  });
});