/**
 * E2E: v0.11.0 migration-flow against real Postgres + temp $HOME.
 *
 * Exercises the full orchestrator from Phase A (schema apply via
 * `gbrain init --migrate-only`) through Phase G (completed.jsonl append),
 * skipping Phase F (autopilot install) to avoid writing a launchd plist
 * or crontab entry on the CI host. Worker supervision + autopilot-cycle
 * handler are covered by the unit-layer tests (test/handlers.test.ts and
 * test/autopilot-resolve-cli.test.ts); this E2E locks the schema → prefs
 * → host-rewrite → completed.jsonl chain against a live database.
 *
 * Gated by DATABASE_URL — skips gracefully when unset per CLAUDE.md
 * lifecycle.
 */

import { describe, test, expect, beforeAll, afterAll, beforeEach } from 'bun:test';
import {
  mkdtempSync,
  rmSync,
  writeFileSync,
  readFileSync,
  existsSync,
  mkdirSync,
  statSync,
} from 'fs';
import { join } from 'path';
import { tmpdir } from 'os';

import { v0_11_0 } from '../../src/commands/migrations/v0_11_0.ts';
import { loadPreferences, loadCompletedMigrations } from '../../src/core/preferences.ts';
import { hasDatabase } from './helpers.ts';

const SKIP = !hasDatabase();
const describeE2E = SKIP ? describe.skip : describe;
const DATABASE_URL = process.env.DATABASE_URL ?? '';

let tmp: string;
let origHome: string | undefined;
let origGbrainHome: string | undefined;
let origPath: string | undefined;
let fakeBinDir: string;
const CLI_PATH = join(import.meta.dir, '..', '..', 'src', 'cli.ts');

// Module-level PATH shim. The orchestrator shells out to `gbrain init
// --migrate-only` and `gbrain jobs smoke`. On source-install test envs
// there's no `gbrain` on $PATH. Install a tiny bash shim that `exec`s
// `bun run src/cli.ts` and prepend it to $PATH before any tests import
// the orchestrator. Running at module-init (not beforeAll) guarantees
// the shim exists before Bun's test runner loads described blocks.
if (!SKIP) {
  origPath = process.env.PATH;
  fakeBinDir = mkdtempSync(join(tmpdir(), 'gbrain-e2e-bin-'));
  const shim = join(fakeBinDir, 'gbrain');
  writeFileSync(
    shim,
    `#!/usr/bin/env bash\nexec bun run "${CLI_PATH}" "$@"\n`,
    { mode: 0o755 },
  );
  process.env.PATH = `${fakeBinDir}:${origPath ?? ''}`;
  console.log('[migration-flow.e2e] shim installed at', shim, 'PATH prepended');
}

function freshTempHome(label: string) {
  const dir = mkdtempSync(join(tmpdir(), `gbrain-e2e-migration-${label}-`));
  // preferences.ts's gbrainDir() returns `$HOME/.gbrain` when GBRAIN_HOME
  // is unset. Test fixtures write to `$dir/.gbrain/...`, so set HOME only
  // and clear any inherited GBRAIN_HOME (which would route prefs to $dir
  // directly, no .gbrain suffix).
  process.env.HOME = dir;
  delete process.env.GBRAIN_HOME;
  // Seed config so Phase A's `gbrain init --migrate-only` has a target.
  mkdirSync(join(dir, '.gbrain'), { recursive: true });
  writeFileSync(
    join(dir, '.gbrain', 'config.json'),
    JSON.stringify({ engine: 'postgres', database_url: DATABASE_URL }, null, 2) + '\n',
    { mode: 0o600 },
  );
  return dir;
}

// Restore HOME/PATH to the captured originals. Called from each test's
// `finally` so a throw mid-test can never leave HOME/PATH pointed at a temp
// dir for the rest of the bun process (which would silently break unrelated
// suites that read HOME). PATH keeps the shim prepended because the
// module-level shim install is what subsequent tests in this suite rely on;
// afterAll does the final teardown to the pristine origPath.
function restoreHomePath() {
  if (origHome === undefined) delete process.env.HOME;
  else process.env.HOME = origHome;
  if (origPath === undefined) delete process.env.PATH;
  else process.env.PATH = `${fakeBinDir}:${origPath ?? ''}`;
}

beforeAll(() => {
  if (SKIP) {
    console.log('[migration-flow.e2e] DATABASE_URL not set — skipping.');
    return;
  }
  origHome = process.env.HOME;
  origGbrainHome = process.env.GBRAIN_HOME;
});

afterAll(() => {
  if (SKIP) return;
  if (origHome === undefined) delete process.env.HOME;
  else process.env.HOME = origHome;
  if (origGbrainHome === undefined) delete process.env.GBRAIN_HOME;
  else process.env.GBRAIN_HOME = origGbrainHome;
  if (origPath === undefined) delete process.env.PATH;
  else process.env.PATH = origPath;
  try { if (fakeBinDir) rmSync(fakeBinDir, { recursive: true, force: true }); } catch { /* best-effort */ }
});

beforeEach(() => {
  if (SKIP) return;
  // Robust restore: if a prior test threw before its own finally ran (or
  // before afterAll), HOME/PATH could still point at a dead temp dir. Reset
  // them to the captured originals at the start of every test so a throw in
  // one test can never leak a temp HOME/PATH into sibling suites that read
  // them. freshTempHome() re-points HOME per test immediately after this.
  if (origHome === undefined) delete process.env.HOME;
  else process.env.HOME = origHome;
  if (origPath === undefined) delete process.env.PATH;
  else process.env.PATH = `${fakeBinDir}:${origPath ?? ''}`;
  try { if (tmp) rmSync(tmp, { recursive: true, force: true }); } catch { /* best-effort */ }
});

const COMMON_OPTS = {
  yes: true,
  mode: 'pain_triggered' as const,
  dryRun: false,
  hostDir: undefined,
  noAutopilotInstall: true, // critical: don't install launchd/systemd/crontab on CI
};

describeE2E('E2E: v0.11.0 orchestrator against live Postgres', () => {
  test('fresh install flow: schema → smoke → prefs → host-rewrite → completed', async () => {
    tmp = freshTempHome('fresh');
    try {
      const result = await v0_11_0.orchestrator(COMMON_OPTS);

      // Orchestrator returns a structured result (status is `complete` when
      // no pending-host-work TODOs fired, `partial` otherwise).
      expect(result.version).toBe('0.11.0');
      expect(['complete', 'partial']).toContain(result.status);

      // Phase D: preferences.json exists with 0o600 + mode=pain_triggered.
      const prefsPath = join(tmp, '.gbrain', 'preferences.json');
      expect(existsSync(prefsPath)).toBe(true);
      expect(statSync(prefsPath).mode & 0o777).toBe(0o600);
      const prefs = loadPreferences();
      expect(prefs.minion_mode).toBe('pain_triggered');
      expect(prefs.set_at).toBeTruthy();
      expect(prefs.set_in_version).toBeTruthy();

      // Bug 3 (v0.14.2) — orchestrator no longer writes completed.jsonl.
      // The runner (apply-migrations.ts) persists the result after the
      // orchestrator returns. A direct orchestrator call in E2E leaves the
      // ledger empty; the runner path is tested separately in
      // test/apply-migrations.test.ts + test/migration-resume.test.ts.
      const completed = loadCompletedMigrations();
      const v0110Entries = completed.filter(e => e.version === '0.11.0');
      expect(v0110Entries.length).toBe(0);

      // Phase F is skipped per COMMON_OPTS — autopilot should NOT have been
      // installed on this host.
      expect(result.autopilot_installed).toBe(false);
    } finally {
      restoreHomePath();
    }
  }, 60_000);

  test('idempotent rerun: second invocation is a safe no-op', async () => {
    tmp = freshTempHome('rerun');
    try {
      const first = await v0_11_0.orchestrator(COMMON_OPTS);
      expect(['complete', 'partial']).toContain(first.status);

      const second = await v0_11_0.orchestrator(COMMON_OPTS);
      expect(['complete', 'partial']).toContain(second.status);

      // Bug 3 (v0.14.2) — orchestrator does not write completed.jsonl, so
      // repeated direct invocations don't accumulate ledger entries. Assert
      // the preferences state stays stable (the real idempotency signal for
      // this orchestrator is "running again doesn't corrupt preferences").
      expect(loadPreferences().minion_mode).toBe('pain_triggered');
      const completed = loadCompletedMigrations();
      expect(completed.filter(e => e.version === '0.11.0').length).toBe(0);
    } finally {
      restoreHomePath();
    }
  }, 90_000);

  test('host rewrite: builtin handlers auto-rewritten, non-builtins queued as JSONL TODOs', async () => {
    tmp = freshTempHome('host-rewrite');
    try {
      // Fixture: AGENTS.md + cron/jobs.json with a mix of gbrain-builtin and
      // non-builtin handlers.
      const claudeDir = join(tmp, '.claude');
      mkdirSync(claudeDir, { recursive: true });
      writeFileSync(
        join(claudeDir, 'AGENTS.md'),
        '# Test AGENTS.md\n\nSome existing content referencing sessions_spawn routing.\n',
      );
      mkdirSync(join(claudeDir, 'cron'), { recursive: true });
      writeFileSync(
        join(claudeDir, 'cron', 'jobs.json'),
        JSON.stringify({
          jobs: [
            { schedule: '*/5 * * * *', kind: 'agentTurn', skill: 'sync' },              // builtin
            { schedule: '0 */30 * * *', kind: 'agentTurn', skill: 'ea-inbox-sweep' },    // non-builtin
            { schedule: '*/10 * * * *', kind: 'agentTurn', skill: 'embed' },             // builtin
            { schedule: '0 8 * * *', kind: 'agentTurn', skill: 'morning-briefing' },      // non-builtin
          ],
        }, null, 2) + '\n',
      );

      const result = await v0_11_0.orchestrator(COMMON_OPTS);

      // Builtins rewritten in place; non-builtins left alone.
      const cronAfter = JSON.parse(readFileSync(join(claudeDir, 'cron', 'jobs.json'), 'utf-8'));
      expect(cronAfter.jobs[0].kind).toBe('shell');       // sync (builtin)
      expect(cronAfter.jobs[0].cmd).toContain('gbrain jobs submit sync');
      expect(cronAfter.jobs[1].kind).toBe('agentTurn');   // ea-inbox-sweep (non-builtin)
      expect(cronAfter.jobs[2].kind).toBe('shell');       // embed (builtin)
      expect(cronAfter.jobs[3].kind).toBe('agentTurn');   // morning-briefing (non-builtin)

      // files_rewritten counts the 2 builtin rewrites.
      expect(result.files_rewritten).toBeGreaterThanOrEqual(2);

      // pending_host_work counts the 2 non-builtin TODOs.
      expect(result.pending_host_work).toBe(2);

      // Status is "partial" because non-builtin TODOs remain.
      expect(result.status).toBe('partial');

      // AGENTS.md got the marker injected.
      const agentsMdAfter = readFileSync(join(claudeDir, 'AGENTS.md'), 'utf-8');
      expect(agentsMdAfter).toContain('gbrain:subagent-routing v0.11.0');
      expect(agentsMdAfter).toContain('skills/conventions/subagent-routing.md');

      // JSONL TODO file written under ~/.gbrain/migrations/.
      const jsonlPath = join(tmp, '.gbrain', 'migrations', 'pending-host-work.jsonl');
      expect(existsSync(jsonlPath)).toBe(true);
      const lines = readFileSync(jsonlPath, 'utf-8').split('\n').filter(l => l.trim());
      expect(lines.length).toBe(2);
      const todos = lines.map(l => JSON.parse(l));
      const handlers = todos.map(t => t.handler).sort();
      expect(handlers).toEqual(['ea-inbox-sweep', 'morning-briefing']);
      for (const todo of todos) {
        expect(todo.type).toBe('cron-handler-needs-host-registration');
        expect(todo.status).toBe('pending');
        expect(todo.manifest_path).toContain('cron/jobs.json');
      }
    } finally {
      restoreHomePath();
    }
  }, 90_000);

  test('resumable: partial run → orchestrator re-run → complete', async () => {
    tmp = freshTempHome('resumable');
    try {
      // Simulate a stopgap-written partial entry BEFORE running the orchestrator.
      mkdirSync(join(tmp, '.gbrain', 'migrations'), { recursive: true });
      writeFileSync(
        join(tmp, '.gbrain', 'migrations', 'completed.jsonl'),
        JSON.stringify({
          version: '0.11.0',
          status: 'partial',
          apply_migrations_pending: true,
          mode: 'pain_triggered',
          source: 'fix-v0.11.0.sh',
          ts: new Date().toISOString(),
        }) + '\n',
      );

      // Orchestrator re-running on a partial → should succeed (schema apply
      // and smoke are idempotent; prefs are preserved from the partial
      // record; host-rewrite runs its safe-skip pass). Per Bug 3 (v0.14.2),
      // the orchestrator itself doesn't append to completed.jsonl — the
      // runner does. The stopgap's partial entry stays unchanged here.
      const result = await v0_11_0.orchestrator(COMMON_OPTS);
      expect(['complete', 'partial']).toContain(result.status);

      const completed = loadCompletedMigrations();
      const v0110 = completed.filter(e => e.version === '0.11.0');
      // Just the stopgap partial — orchestrator doesn't add its own entry.
      expect(v0110.length).toBe(1);
      expect(v0110[0].status).toBe('partial');
      expect(v0110[0].source).toBe('fix-v0.11.0.sh');
    } finally {
      restoreHomePath();
    }
  }, 90_000);
});
