import { describe, test, beforeEach, afterEach } from "node:test";
import assert from "node:assert/strict";
import { execFileSync } from "node:child_process";
import { mkdtempSync, rmSync, existsSync, readFileSync, writeFileSync, mkdirSync } from "node:fs";
import { join, dirname } from "node:path";
import { fileURLToPath } from "node:url";
import { tmpdir } from "node:os";

const HERE = dirname(fileURLToPath(import.meta.url));
const CLI = join(HERE, "..", "src", "cli.ts");

function runCli(root: string, args: string[]): { stdout: string; code: number } {
  try {
    const stdout = execFileSync("node", ["--import", "tsx", CLI, ...args], {
      env: { ...process.env, LINKEDIN_STUDIO_DATA: root },
      encoding: "utf8",
    });
    return { stdout, code: 0 };
  } catch (e: any) {
    return { stdout: (e.stdout ?? "") + (e.stderr ?? ""), code: e.status ?? 1 };
  }
}

const candidatesFile = (root: string, items: unknown): string => {
  const p = join(root, "candidates.json");
  writeFileSync(p, JSON.stringify(items), "utf8");
  return p;
};
const profilePath = (root: string) => join(root, "brain", "profile.md");
const pendingJson = (root: string) => join(root, "brain", "pending-diff.json");
const pendingMd = (root: string) => join(root, "brain", "pending-diff.md");
const validCand = { key: "topic", value: "AI safety", provenance: "published", source: "manual", observed_date: "2026-06-23" };

describe("brain consolidate CLI (SC5)", () => {
  let root: string;
  beforeEach(() => {
    root = mkdtempSync(join(tmpdir(), "brain-consol-"));
    runCli(root, ["init"]); // seed brain/profile.md
  });
  afterEach(() => rmSync(root, { recursive: true, force: true }));

  test("--gather reads published bodies (filtered by last_run) and writes nothing", () => {
    runCli(root, ["ingest", "--file", (() => { const f = join(root, "p.md"); writeFileSync(f, "A post about AI safety governance.", "utf8"); return f; })()]);
    const before = readFileSync(profilePath(root), "utf8");
    const { stdout, code } = runCli(root, ["consolidate", "--gather"]);
    assert.equal(code, 0);
    assert.match(stdout, /AI safety governance/, "gather surfaces the published body");
    assert.equal(readFileSync(profilePath(root), "utf8"), before, "gather leaves profile.md unchanged");
  });

  test("--propose writes pending-diff.{md,json}, leaves profile.md unchanged", () => {
    const before = readFileSync(profilePath(root), "utf8");
    const { code } = runCli(root, ["consolidate", "--propose", "--candidates", candidatesFile(root, [validCand])]);
    assert.equal(code, 0);
    assert.ok(existsSync(pendingJson(root)), "pending-diff.json written");
    assert.ok(existsSync(pendingMd(root)), "pending-diff.md written");
    assert.equal(readFileSync(profilePath(root), "utf8"), before, "propose leaves profile.md unchanged");
    const diff = JSON.parse(readFileSync(pendingJson(root), "utf8"));
    assert.equal(diff.additions.length, 1);
  });

  test("--propose writes pending-diff.md in OKF-compatible form (type: PendingDiff)", () => {
    // The pending-diff is a transient operator-review artifact that lives in the
    // brain/ bundle, so it must carry a type or okf-check fails the whole bundle
    // mid-propose. (docs/okf-convergence-brief.md Stage-1 deferred item.)
    runCli(root, ["consolidate", "--propose", "--candidates", candidatesFile(root, [validCand])]);
    const block = readFileSync(pendingMd(root), "utf8").match(/^---\n([\s\S]*?)\n---\n/);
    assert.ok(block, "pending-diff.md leads with a frontmatter block");
    assert.match(block![1], /^type:\s*PendingDiff\s*$/m, "pending-diff.md is type PendingDiff");
  });

  test("--propose REJECTS a malformed candidate (missing field), no write", () => {
    const { code } = runCli(root, ["consolidate", "--propose", "--candidates", candidatesFile(root, [{ key: "x", value: "y" }])]);
    assert.notEqual(code, 0, "non-zero exit on malformed candidate");
    assert.ok(!existsSync(pendingJson(root)), "no diff written");
  });

  test("--propose REJECTS a candidate whose value contains a newline, no write", () => {
    const bad = { ...validCand, value: "line one\nline two" };
    const { code } = runCli(root, ["consolidate", "--propose", "--candidates", candidatesFile(root, [bad])]);
    assert.notEqual(code, 0, "non-zero exit on multiline value");
    assert.ok(!existsSync(pendingJson(root)), "no diff written");
  });

  test("--apply --confirm writes profile.md + consolidation-state.json", () => {
    runCli(root, ["consolidate", "--propose", "--candidates", candidatesFile(root, [validCand])]);
    const { code } = runCli(root, ["consolidate", "--apply", "--diff", pendingJson(root), "--confirm"]);
    assert.equal(code, 0);
    assert.match(readFileSync(profilePath(root), "utf8"), /AI safety/, "fact applied to profile.md");
    assert.ok(existsSync(join(root, "brain", "consolidation-state.json")), "last-run sidecar written");
  });

  test("--apply WITHOUT --confirm refuses and writes nothing", () => {
    runCli(root, ["consolidate", "--propose", "--candidates", candidatesFile(root, [validCand])]);
    const before = readFileSync(profilePath(root), "utf8");
    const { code } = runCli(root, ["consolidate", "--apply", "--diff", pendingJson(root)]);
    assert.notEqual(code, 0, "refuses without --confirm");
    assert.equal(readFileSync(profilePath(root), "utf8"), before, "profile.md untouched");
  });

  test("init/ingest/published still work (regression)", () => {
    assert.equal(runCli(root, ["init"]).code, 0);
    const f = join(root, "q.md"); writeFileSync(f, "another post", "utf8");
    assert.equal(runCli(root, ["ingest", "--file", f]).code, 0);
    assert.equal(runCli(root, ["published", "list"]).code, 0);
  });

  const supCand = { key: "topic", value: "AI governance", provenance: "published", source: "manual", observed_date: "2026-06-24", supersedes: "topic" };

  test("S3b-SC6 — Supersessions section renders one line per entry; a plain diff renders none; gated apply writes superseded", () => {
    // plain propose → NO Supersessions section (byte-identity decoy)
    runCli(root, ["consolidate", "--propose", "--candidates", candidatesFile(root, [validCand])]);
    assert.ok(!readFileSync(pendingMd(root), "utf8").includes("## Supersessions"), "no section when 0 supersessions");
    // apply to seed the active fact, then propose a supersede of it
    runCli(root, ["consolidate", "--apply", "--diff", pendingJson(root), "--confirm"]);
    runCli(root, ["consolidate", "--propose", "--candidates", candidatesFile(root, [supCand])]);
    const md = readFileSync(pendingMd(root), "utf8");
    assert.match(md, /## Supersessions/, "section rendered when a supersession exists");
    assert.match(md, /AI safety.*→.*AI governance/, "old → new line rendered");
    const diff = JSON.parse(readFileSync(pendingJson(root), "utf8"));
    assert.equal(diff.supersedes.length, 1, "one supersede op in the JSON");
    // the gated apply writes the superseded status to profile.md
    runCli(root, ["consolidate", "--apply", "--diff", pendingJson(root), "--confirm"]);
    assert.match(readFileSync(profilePath(root), "utf8"), /superseded/, "apply writes the superseded status");
  });

  test("S3b-SC10 — --gather excludes superseded facts from profileFacts", () => {
    runCli(root, ["consolidate", "--propose", "--candidates", candidatesFile(root, [validCand])]);
    runCli(root, ["consolidate", "--apply", "--diff", pendingJson(root), "--confirm"]);
    runCli(root, ["consolidate", "--propose", "--candidates", candidatesFile(root, [supCand])]);
    runCli(root, ["consolidate", "--apply", "--diff", pendingJson(root), "--confirm"]);
    // profile now holds an archival "AI safety" (superseded) + winner "AI governance" (active)
    const { stdout } = runCli(root, ["consolidate", "--gather", "--json"]);
    const out = JSON.parse(stdout);
    const values = out.profileFacts.map((f: any) => f.value);
    assert.ok(values.includes("AI governance"), "active winner present in gather");
    assert.ok(!out.profileFacts.some((f: any) => f.status === "superseded"), "no superseded fact leaks into gather");
  });
});