/**
 * e2e.test.ts — End-to-end tests for the complete lock lifecycle.
 *
 * @module file-claiming/e2e.test
 */

import {
  assert,
  mockOwner,
  TEST_FILE_A,
  TEST_FILE_B,
  SESSION_A,
  SESSION_B,
} from "./test-utils.ts";

// ---------------------------------------------------------------------------
// Lazy module cache
// ---------------------------------------------------------------------------

let _acq: any = null;
let _reg: any = null;
let _cfg: any = null;

async function getAcq() { if (!_acq) _acq = await import("./lock-acquisition.ts"); return _acq; }
async function getReg() { if (!_reg) _reg = await import("./index.ts"); return _reg; }
async function getCfg() { if (!_cfg) _cfg = await import("./config.ts"); return _cfg; }

async function resetAll(): Promise<void> {
  const reg = await getReg();
  reg.resetRegistry();
  const cfg = await getCfg();
  cfg.resetConfig();
}

// ---------------------------------------------------------------------------
// Scenario 1: Single session — claim → edit → release
// ---------------------------------------------------------------------------

async function testSingleSessionLifecycle() {
  await resetAll();
  const acq = await getAcq();
  const reg = await getReg();
  const owner = mockOwner("agent", "editor");

  const claim = acq.acquireLock({ path: TEST_FILE_A, lockType: "write", owner, reason: "Editing file A" });
  assert(claim.success === true, "Step 1: Claim file");
  const claimId = claim.claim!.id;

  const active = reg.getClaimRegistry().getActiveClaims(TEST_FILE_A);
  assert(active.length === 1, "Step 2: File appears in active claims");

  assert(acq.isFileLocked(TEST_FILE_A) === true, "Step 3: File is locked");

  const info = acq.getLockInfo(TEST_FILE_A);
  assert(info.locked === true, "Step 4: Lock info shows locked");
  assert(info.primaryClaim?.id === claimId, "Step 4a: Correct claim");

  reg.getClaimRegistry().release(claimId);
  assert(acq.isFileLocked(TEST_FILE_A) === false, "Step 5: File unlocked after release");
  console.log("✅ E2E Scenario 1: Single session lifecycle complete");
}

// ---------------------------------------------------------------------------
// Scenario 2: Two sessions — coordinated claim → edit → release
// ---------------------------------------------------------------------------

async function testTwoSessionCoordination() {
  await resetAll();
  const acq = await getAcq();
  const reg = await getReg();
  const alice = mockOwner("agent", "alice", SESSION_A);
  const bob = mockOwner("agent", "bob", SESSION_B);

  const aliceClaim = acq.acquireLock({ path: TEST_FILE_A, lockType: "write", owner: alice });
  assert(aliceClaim.success === true, "Alice claims file");

  const bobClaim = acq.acquireLock({ path: TEST_FILE_A, lockType: "write", owner: bob });
  assert(bobClaim.success === false, "Bob's claim is blocked");

  const info = acq.getLockInfo(TEST_FILE_A);
  assert(info.primaryClaim?.owner.id === "alice", "Alice is lock holder");

  reg.getClaimRegistry().release(aliceClaim.claim!.id);

  const bobClaim2 = acq.acquireLock({ path: TEST_FILE_A, lockType: "write", owner: bob });
  assert(bobClaim2.success === true, "Bob claims after Alice releases");

  const infoAfter = acq.getLockInfo(TEST_FILE_A);
  assert(infoAfter.primaryClaim?.owner.id === "bob", "Bob is now lock holder");
  console.log("✅ E2E Scenario 2: Two-session coordination complete");
}

// ---------------------------------------------------------------------------
// Scenario 3: Conflict → resolve → retry → success
// ---------------------------------------------------------------------------

async function testConflictResolutionFlow() {
  await resetAll();
  const acq = await getAcq();
  const reg = await getReg();
  const owner1 = mockOwner("agent", "user-1");
  const owner2 = mockOwner("agent", "user-2");

  acq.acquireLock({ path: TEST_FILE_A, lockType: "write", owner: owner1 });

  const conflictResult = acq.acquireLock({ path: TEST_FILE_A, lockType: "write", owner: owner2 });
  assert(conflictResult.conflict !== undefined, "Conflict detected");

  const resolution = acq.resolveConflict(conflictResult.conflict!, "release");
  assert(resolution.resolved === true, "Conflict resolved");

  const retry = acq.acquireLock({ path: TEST_FILE_A, lockType: "write", owner: owner2 });
  assert(retry.success === true, "Retry succeeds after resolution");
  console.log("✅ E2E Scenario 3: Conflict → resolve → retry complete");
}

// ---------------------------------------------------------------------------
// Scenario 4: Config change during session
// ---------------------------------------------------------------------------

async function testConfigChangeDuringSession() {
  await resetAll();
  const acq = await getAcq();
  const cfg = await getCfg();
  const owner = mockOwner("agent", "config-test");

  const claim = acq.acquireLock({ path: TEST_FILE_A, lockType: "write", owner });
  assert(claim.success === true, "Claim with default config succeeds");

  cfg.setConfig({ autoReleaseTTL: 60_000 });
  assert(cfg.getConfig().autoReleaseTTL === 60_000, "Config changed");

  const claim2 = acq.acquireLock({ path: TEST_FILE_B, lockType: "write", owner });
  assert(claim2.success === true, "New claim uses updated config");

  cfg.setConfig({ showDiagnostics: false });
  assert(cfg.getConfig().showDiagnostics === false, "Diagnostics disabled");
  cfg.setConfig({ showDiagnostics: true });
  assert(cfg.getConfig().showDiagnostics === true, "Diagnostics re-enabled");
  console.log("✅ E2E Scenario 4: Config change during session works");
}

// ---------------------------------------------------------------------------
// Test runner
// ---------------------------------------------------------------------------

async function runTests() {
  console.log("Running End-to-End Tests\n");

  const tests = [
    testSingleSessionLifecycle,
    testTwoSessionCoordination,
    testConflictResolutionFlow,
    testConfigChangeDuringSession,
  ];

  for (const test of tests) {
    try {
      await test();
    } catch (err) {
      console.error(`\n❌ E2E test ${test.name} failed: ${err}`);
      process.exit(1);
    }
  }
  console.log("\n✅ All end-to-end tests passed!");
}

runTests();