'use strict';

const assert = require('node:assert/strict');
const test = require('node:test');
const {
  createPs5FpkgCompletionTrace,
  parseKstuffCompletionSnapshot,
} = require('../../src/services/ps5-fpkg-completion-trace');

const OPERATION_ID = '123e4567-e89b-42d3-a456-426614174000';
const FINGERPRINT = 'a'.repeat(64);

function runtime(overrides = {}) {
  return {
    product: 'EchoStretch/kstuff-lite',
    version: '1.10',
    revision: '3b2ab4a16ba43c8ab38daf7ec83cc297014e0e47',
    payloadSha256: '1'.repeat(64),
    loaderSha256: '2'.repeat(64),
    readerSha256: '3'.repeat(64),
    observabilityPatchSha256: '4'.repeat(64),
    observabilityProfile: 'chimera-p15-a8-call-bound-completion-v1',
    identityStatus: 'exact',
    traceEligible: true,
    firmware: '9.60',
    fingerprint: FINGERPRINT,
    ...overrides,
  };
}

function metrics(overrides = {}) {
  return {
    nmountDispatch: 0,
    taggedArmAttempts: 0,
    taggedReadFailures: 0,
    taggedPcbPointerFailures: 0,
    taggedPcbStateFailures: 0,
    taggedStackPushFailures: 0,
    taggedPcbSetFailures: 0,
    taggedWriteFailures: 0,
    taggedArmSuccesses: 0,
    taggedRollbackRestoreFailures: 0,
    taggedFinishEntries: 0,
    taggedFinishPeekFailures: 0,
    taggedFinishRestoreFailures: 0,
    taggedFinishSuccesses: 0,
    mailboxTotal: 0,
    mailboxFpkg: 0,
    mailboxUnhandled: 0,
    verifySuperBlockMailbox: 0,
    verifySuperBlockEmulated: 0,
    ...overrides,
  };
}

function snapshot(sequence, values) {
  return { sequence, sampledAt: 1000 + sequence, runtimeFingerprint: FINGERPRINT, metrics: metrics(values) };
}

function trace(postMetrics, overrides = {}) {
  const post = snapshot(11, postMetrics);
  return createPs5FpkgCompletionTrace({
    operationId: OPERATION_ID,
    titleId: 'FAKE00000',
    runtime: runtime(),
    pre: snapshot(10, metrics()),
    post,
    postStable: snapshot(12, postMetrics),
    postStableConfirm: snapshot(13, postMetrics),
    launchRequests: 1,
    retryPerformed: false,
    ...overrides,
  });
}

test('A8 strict parser accepts the exact semantic completion schema', () => {
  const parsed = parseKstuffCompletionSnapshot([
    'schema=chimera.p15-a8-completion-metrics.v1',
    'status=attached',
    'sample=8',
    'route nmount_dispatch=7',
    'completion tag=nmount attempt=7 read_fail=0 pcb_ptr_fail=0 pcb_state_fail=0 stack_fail=0 pcb_set_fail=0 write_fail=0 armed=7 rollback_restore_fail=0 finish_entry=7 finish_peek_fail=1 finish_restore_fail=0 finish=6',
    'mailbox total=4 fpkg=3 unhandled=1',
    'fpkg verify=3 verify_emu=3',
  ].join('\n'), { sequence: 8, sampledAt: 1008, runtimeFingerprint: FINGERPRINT });
  assert.equal(parsed.metrics.taggedArmSuccesses, 7);
  assert.equal(parsed.metrics.taggedFinishEntries, 7);
  assert.equal(parsed.metrics.taggedFinishPeekFailures, 1);
});

test('A8 parser rejects raw data, unknown tags, duplicate fields and sample drift', () => {
  const base = [
    'schema=chimera.p15-a8-completion-metrics.v1', 'status=attached', 'sample=8',
    'route nmount_dispatch=1',
    'completion tag=nmount attempt=1 read_fail=0 pcb_ptr_fail=0 pcb_state_fail=0 stack_fail=0 pcb_set_fail=0 write_fail=0 armed=1 rollback_restore_fail=0 finish_entry=1 finish_peek_fail=0 finish_restore_fail=0 finish=1',
    'mailbox total=0 fpkg=0 unhandled=0', 'fpkg verify=0 verify_emu=0',
  ];
  for (const unsafe of [
    [...base, 'request_ptr=0xffff800012345678'],
    base.map(line => line.startsWith('completion ') ? line.replace('tag=nmount', 'tag=ioctl') : line),
    base.map(line => line.startsWith('completion ') ? `${line} finish=1` : line),
    base.map(line => line === 'sample=8' ? 'sample=9' : line),
  ]) {
    assert.throws(
      () => parseKstuffCompletionSnapshot(unsafe.join('\n'), { sequence: 8, sampledAt: 1008, runtimeFingerprint: FINGERPRINT }),
      error => error.code === 'PS5_FPKG_COMPLETION_TRACE_UNSAFE_LINE',
    );
  }
});

test('A8 proves a balanced call-bound arm and successful finalization', () => {
  const result = trace(metrics({
    nmountDispatch: 1, taggedArmAttempts: 1, taggedArmSuccesses: 1,
    taggedFinishEntries: 1, taggedFinishSuccesses: 1,
  }));
  assert.equal(result.status, 'observed');
  assert.equal(result.lifecycle.attribution, 'call-bound-nmount');
  assert.equal(result.lifecycle.unresolvedArms, 0);
  assert.equal(result.recovery.debugRegistersRestored, true);
  assert.equal(result.normalizedFailure, 'PS5_FPKG_MAILBOX_TARGET_NOT_REACHED');
});

test('A8 makes a post-arm stack peek failure terminal and visible', () => {
  const result = trace(metrics({
    nmountDispatch: 1, taggedArmAttempts: 1, taggedArmSuccesses: 1,
    taggedFinishEntries: 1, taggedFinishPeekFailures: 1,
  }));
  assert.equal(result.status, 'observed');
  assert.equal(result.firstFailedStage, 'debug_register_finish_stack_peek_failed');
  assert.equal(result.normalizedFailure, 'PS5_FPKG_DEBUG_REGISTER_FINISH_PEEK_FAILED');
  assert.equal(result.lifecycle.unresolvedArms, 0);
  assert.equal(result.recovery.debugRegistersRestored, false);
});

test('A8 qualifies a completion that settles after the immediate post sample', () => {
  const complete = metrics({
    nmountDispatch: 1, taggedArmAttempts: 1, taggedArmSuccesses: 1,
    taggedFinishEntries: 1, taggedFinishSuccesses: 1,
  });
  const result = trace(complete, {
    post: snapshot(11, metrics({ nmountDispatch: 1, taggedArmAttempts: 1, taggedArmSuccesses: 1 })),
    postStable: snapshot(12, complete),
    postStableConfirm: snapshot(13, complete),
  });
  assert.equal(result.status, 'observed');
  assert.equal(result.postArmSettled, true);
  assert.equal(result.lifecycle.unresolvedArms, 0);
});

test('A8 fails closed on missing or contradictory call-bound terminal events', () => {
  const missing = trace(metrics({ nmountDispatch: 1, taggedArmAttempts: 1, taggedArmSuccesses: 1 }));
  assert.equal(missing.status, 'outcome_unknown');
  assert.equal(missing.outcomeReason, 'call_bound_finalization_missing');
  assert.equal(missing.lifecycle.unresolvedArms, 1);

  const contradictory = trace(metrics({
    nmountDispatch: 1, taggedArmAttempts: 1, taggedArmSuccesses: 1,
    taggedFinishEntries: 1, taggedFinishPeekFailures: 1, taggedFinishSuccesses: 1,
  }));
  assert.equal(contradictory.status, 'outcome_unknown');
  assert.equal(contradictory.outcomeReason, 'finish_accounting_invariant_failed');
});

test('A8 never upgrades the immutable A7 five-count mismatch into a kernel failure claim', () => {
  const result = trace(metrics({
    nmountDispatch: 85, taggedArmAttempts: 85, taggedArmSuccesses: 85,
    taggedFinishEntries: 80, taggedFinishSuccesses: 80,
  }));
  assert.equal(result.status, 'outcome_unknown');
  assert.equal(result.outcomeReason, 'launch_scope_ambiguous');
  assert.equal(result.legacyA7InferenceAllowed, false);
});

test('A8 does not attribute unrelated global mailbox activity to the nmount', () => {
  const result = trace(metrics({
    nmountDispatch: 1, taggedArmAttempts: 1, taggedArmSuccesses: 1,
    taggedFinishEntries: 1, taggedFinishSuccesses: 1,
    mailboxTotal: 1, mailboxUnhandled: 1,
  }));
  assert.equal(result.status, 'outcome_unknown');
  assert.equal(result.outcomeReason, 'mailbox_scope_ambiguous');
  assert.equal(result.normalizedFailure, null);
});