import { afterAll, beforeAll, describe, expect, test } from "bun:test";
import { mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join, resolve } from "node:path";
import { envValue } from "./helpers";

const entrypoint = resolve(import.meta.dir, "../src/index.ts");

let tmpStore: string;
let typeHash: string;
let nodeHash: string;

beforeAll(async () => {
  tmpStore = mkdtempSync(join(tmpdir(), "ocas-e2e-"));

  const schemaFile = join(tmpStore, "test-schema.json");
  writeFileSync(
    schemaFile,
    JSON.stringify({
      type: "object",
      properties: { name: { type: "string" }, age: { type: "number" } },
      required: ["name"],
      additionalProperties: false,
    }),
  );
  const { openStore: openFsStore } = await import("@ocas/fs");
  const { putSchema } = await import("@ocas/core");
  const store = await openFsStore(tmpStore);
  typeHash = await putSchema(
    store,
    JSON.parse(readFileSync(schemaFile, "utf-8")),
  );

  const nodeFile = join(tmpStore, "test-node.json");
  writeFileSync(nodeFile, JSON.stringify({ name: "Alice", age: 30 }));
  const { stdout } = await runCli(["put", typeHash, nodeFile]);
  nodeHash = envValue(stdout) as string;

  // Set a var referencing the node so it survives GC
  await runCli(["var", "set", "@test/gc-test/ref", nodeHash]);
});

afterAll(() => {
  rmSync(tmpStore, { recursive: true, force: true });
});

async function runCli(
  args: string[],
): Promise<{ stdout: string; stderr: string; exitCode: number }> {
  const proc = Bun.spawn(["bun", entrypoint, "--home", tmpStore, ...args], {
    stdout: "pipe",
    stderr: "pipe",
  });
  const exitCode = await proc.exited;
  const stdout = (await new Response(proc.stdout).text()).trim();
  const stderr = (await new Response(proc.stderr).text()).trim();
  return { stdout, stderr, exitCode };
}

// ---- Phase 6: GC ----

describe("Phase 6: GC", () => {
  test("6.1 gc runs without error", async () => {
    const { exitCode, stdout } = await runCli(["gc"]);
    expect(exitCode).toBe(0);
    // Assert structural shape only — exact counts depend on phase history
    const result = envValue(stdout) as Record<string, unknown>;
    expect(typeof result.total).toBe("number");
    expect(typeof result.reachable).toBe("number");
    expect(typeof result.collected).toBe("number");
    expect(typeof result.scanned).toBe("number");
    expect(result.total as number).toBeGreaterThanOrEqual(
      result.reachable as number,
    );
  });

  test("6.2 gc | render -p renders the gc stats", async () => {
    const { stdout: gcOut, exitCode: gcExit } = await runCli(["gc"]);
    expect(gcExit).toBe(0);

    const proc = Bun.spawn(
      ["bun", entrypoint, "--home", tmpStore, "render", "--pipe"],
      { stdin: "pipe", stdout: "pipe", stderr: "pipe" },
    );
    proc.stdin.write(gcOut);
    proc.stdin.end();
    const exitCode = await proc.exited;
    const stdout = (await new Response(proc.stdout).text()).trim();
    expect(exitCode).toBe(0);
    // gc value is an object { total, reachable, collected, scanned }
    expect(stdout).toContain("total:");
  });

  test("6.3 gc preserves node referenced by a var", async () => {
    const { exitCode } = await runCli(["gc"]);
    expect(exitCode).toBe(0);
    const { stdout } = await runCli(["has", nodeHash]);
    expect(envValue(stdout)).toBe(true);
  });

  test("6.4 gc reclaims orphan node", async () => {
    const orphanFile = join(tmpStore, "orphan.json");
    writeFileSync(orphanFile, JSON.stringify({ name: "Orphan", age: 99 }));
    const { stdout: orphanOut } = await runCli(["put", typeHash, orphanFile]);
    const orphanHash = envValue(orphanOut) as string;

    const { stdout: beforeGc } = await runCli(["has", orphanHash]);
    expect(envValue(beforeGc)).toBe(true);

    await runCli(["gc"]);
    const { stdout: afterGc } = await runCli(["has", orphanHash]);
    expect(envValue(afterGc)).toBe(false);
  });
});