import { describe, test, beforeEach, afterEach } from "node:test";
import assert from "node:assert/strict";
import { mkdtempSync, rmSync, existsSync, readFileSync, statSync, writeFileSync } from "node:fs";
import { join } from "node:path";
import { tmpdir } from "node:os";

import { initBrain } from "../src/scaffold.js";
import { parseProfile } from "../src/profile.js";

const EXPECTED_DIRS = ["brain", "brain/journal", "ingest", "ingest/inbox", "ingest/published"];
const EXPECTED_FILES = ["brain/profile.md", "brain/index.md", "brain/operations.md"];

describe("initBrain scaffold (SC1)", () => {
  let root: string;
  const prevEnv = process.env.LINKEDIN_STUDIO_DATA;

  beforeEach(() => {
    root = mkdtempSync(join(tmpdir(), "brain-scaffold-"));
    process.env.LINKEDIN_STUDIO_DATA = root;
  });

  afterEach(() => {
    if (prevEnv === undefined) delete process.env.LINKEDIN_STUDIO_DATA;
    else process.env.LINKEDIN_STUDIO_DATA = prevEnv;
    rmSync(root, { recursive: true, force: true });
  });

  test("creates the full brain/ + ingest/ tree at the runtime data-path", () => {
    const res = initBrain();
    for (const d of EXPECTED_DIRS) {
      assert.ok(existsSync(join(root, d)) && statSync(join(root, d)).isDirectory(), `dir ${d}`);
    }
    for (const f of EXPECTED_FILES) {
      assert.ok(existsSync(join(root, f)), `file ${f}`);
    }
    // first run reports everything as created, nothing skipped
    assert.equal(res.skipped.length, 0);
    assert.ok(res.created.length >= EXPECTED_FILES.length);
  });

  test("profile.md is a parseable two-layer doc seeded from the template", () => {
    initBrain();
    const doc = parseProfile(readFileSync(join(root, "brain/profile.md"), "utf8"));
    assert.equal(doc.schemaVersion, 1);
    assert.ok(doc.static.length > 0, "static layer seeded from the template field-set");
  });

  test("index.md and operations.md carry their real seed anchors", () => {
    initBrain();
    const index = readFileSync(join(root, "brain/index.md"), "utf8");
    const ops = readFileSync(join(root, "brain/operations.md"), "utf8");
    for (const trib of ["voice-samples", "specifics-bank", "trends", "analytics", "ingest"]) {
      assert.match(index, new RegExp(trib), `index mentions ${trib}`);
    }
    assert.match(ops, /Who I am now/);
    assert.match(ops, /## Plans/);
    assert.match(ops, /## Ideas/);
  });

  test("a second invocation is a no-op — every target skipped, content unchanged", () => {
    initBrain();
    const before = EXPECTED_FILES.map((f) => readFileSync(join(root, f), "utf8"));
    const res2 = initBrain();
    assert.equal(res2.created.length, 0, "nothing re-created");
    assert.ok(res2.skipped.length >= EXPECTED_FILES.length, "everything skipped");
    const after = EXPECTED_FILES.map((f) => readFileSync(join(root, f), "utf8"));
    assert.deepEqual(after, before, "no clobber of existing content");
  });

  test("a second invocation never clobbers a user-edited file", () => {
    initBrain();
    const opsPath = join(root, "brain/operations.md");
    const edited = readFileSync(opsPath, "utf8") + "\n## Plans\n- ship SB-S1\n";
    writeFileSync(opsPath, edited, "utf8");
    initBrain();
    assert.equal(readFileSync(opsPath, "utf8"), edited, "user edit preserved");
  });
});