import { assertEquals } from "https://deno.land/std@0.224.0/testing/asserts.ts";

/**
 * Proof of Concept: Orphan Branches (Gen 2)
 *
 * Demonstrates isolating state data into an actual orphan branch within an isolated Git repository.
 */

async function runGitCmd(
  args: string[],
  cwd?: string
): Promise<{ success: boolean; stdout: string; stderr: string }> {
  const cmd = new Deno.Command("git", {
    args,
    cwd,
    stdout: "piped",
    stderr: "piped",
  });
  const output = await cmd.output();
  const stdout = new TextDecoder().decode(output.stdout).trim();
  const stderr = new TextDecoder().decode(output.stderr).trim();
  return { success: output.success, stdout, stderr };
}

if (import.meta.main) {
  console.log("Running Orphan Branch (Gen 2) tests...");

  try {
    const tempRepoDir = await Deno.makeTempDir();

    // Init isolated git repo
    await runGitCmd(["init"], tempRepoDir);
    await runGitCmd(["config", "user.name", "Agent Forum"], tempRepoDir);
    await runGitCmd(["config", "user.email", "agent@forum.local"], tempRepoDir);

    // Initial commit on main
    await Deno.writeTextFile(`${tempRepoDir}/main.ts`, "console.log('main code');");
    await runGitCmd(["add", "main.ts"], tempRepoDir);
    await runGitCmd(["commit", "-m", "Initial code commit"], tempRepoDir);

    // Get default branch name since it might be main or master depending on git config
    const branchRes = await runGitCmd(["branch", "--show-current"], tempRepoDir);
    const mainBranch = branchRes.stdout || "master";

    // Create an orphan branch for state
    await runGitCmd(["checkout", "--orphan", "forum/meta-state"], tempRepoDir);
    await runGitCmd(["rm", "-rf", "."], tempRepoDir);

    const statePayload = JSON.stringify({ active_task: "task-001", status: "running" });
    await Deno.writeTextFile(`${tempRepoDir}/state.json`, statePayload);

    await runGitCmd(["add", "state.json"], tempRepoDir);
    await runGitCmd(["commit", "-m", "State update"], tempRepoDir);

    // Verify main code isn't in this branch
    const lsTreeState = await runGitCmd(["ls-tree", "HEAD"], tempRepoDir);
    assertEquals(lsTreeState.stdout.includes("state.json"), true);
    assertEquals(lsTreeState.stdout.includes("main.ts"), false);

    // Checkout main, verify state.json isn't there
    await runGitCmd(["checkout", mainBranch], tempRepoDir);
    const lsTreeMain = await runGitCmd(["ls-tree", "HEAD"], tempRepoDir);
    assertEquals(lsTreeMain.stdout.includes("main.ts"), true);
    assertEquals(lsTreeMain.stdout.includes("state.json"), false);

    await Deno.remove(tempRepoDir, { recursive: true });

    console.log("✅ Orphan Branch (Gen 2) PoC successful: Verified absolute isolation of state vs code.");
  } catch (err) {
    console.error("❌ Orphan Branch (Gen 2) PoC failed:", err);
    Deno.exit(1);
  }
}