import { describe, it, afterEach } from 'node:test';
import assert from 'node:assert/strict';
import { join } from 'path';
import { existsSync } from 'fs';
import { runHook, setupTestDir, cleanupTestDir, createStateFile, readJsonl } from './test-helper.mjs';

let dir;
afterEach(() => { if (dir) cleanupTestDir(dir); });

describe('session-end', () => {
  it('finalizes session record and deletes state file', () => {
    dir = setupTestDir();
    const nowEpoch = Math.floor(Date.now() / 1000);
    createStateFile(dir, 's1', {
      start_epoch: nowEpoch - 300, start_iso: '2026-01-01T10:00:00Z',
      tool_count: 5, edit_count: 2,
      dep_flags: 1, esc_flags: 0, fatigue_flags: 0, val_flags: 1,
      last_event_epoch: 0, burst_count: 0, last_warning_epoch: 0,
    });
    runHook('session-end.mjs', { session_id: 's1', cwd: '/tmp' }, dir);
    const records = readJsonl(join(dir, 'sessions.jsonl'));
    const end = records.find(r => r.end);
    assert.ok(end);
    assert.equal(end.session_id, 's1');
    assert.equal(end.tool_count, 5);
    assert.equal(end.edit_count, 2);
    assert.ok(!existsSync(join(dir, 'state', 's1.json')));
  });

  it('computes duration correctly', () => {
    dir = setupTestDir();
    const nowEpoch = Math.floor(Date.now() / 1000);
    createStateFile(dir, 's2', {
      start_epoch: nowEpoch - 3600, start_iso: '2026-01-01T10:00:00Z',
      tool_count: 10, edit_count: 3,
      dep_flags: 0, esc_flags: 0, fatigue_flags: 0, val_flags: 0,
      last_event_epoch: 0, burst_count: 0, last_warning_epoch: 0,
    });
    runHook('session-end.mjs', { session_id: 's2', cwd: '/tmp' }, dir);
    const records = readJsonl(join(dir, 'sessions.jsonl'));
    const end = records.find(r => r.end);
    assert.ok(end.duration_min >= 59 && end.duration_min <= 61);
  });

  it('preserves flags in final record', () => {
    dir = setupTestDir();
    createStateFile(dir, 's3', {
      start_epoch: Math.floor(Date.now() / 1000) - 60, start_iso: '2026-01-01T10:00:00Z',
      tool_count: 1, edit_count: 0,
      dep_flags: 3, esc_flags: 1, fatigue_flags: 2, val_flags: 0,
      last_event_epoch: 0, burst_count: 0, last_warning_epoch: 0,
    });
    runHook('session-end.mjs', { session_id: 's3', cwd: '/tmp' }, dir);
    const records = readJsonl(join(dir, 'sessions.jsonl'));
    const end = records.find(r => r.end);
    assert.deepEqual(end.flags, { dependency: 3, escalation: 1, fatigue: 2, validation: 0, pushback: 0 });
  });

  it('handles missing state file gracefully', () => {
    dir = setupTestDir();
    runHook('session-end.mjs', { session_id: 'missing', cwd: '/tmp' }, dir);
    const records = readJsonl(join(dir, 'sessions.jsonl'));
    assert.equal(records.length, 1);
    assert.equal(records[0].note, 'no_state_file');
  });

  it('persists pushback_count and coerces v1.1.0 string domain to array', () => {
    dir = setupTestDir();
    createStateFile(dir, 's4', {
      start_epoch: Math.floor(Date.now() / 1000) - 120, start_iso: '2026-01-01T10:00:00Z',
      tool_count: 2, edit_count: 1,
      dep_flags: 0, esc_flags: 0, fatigue_flags: 0, val_flags: 0,
      pushback_count: 3, domain_context: 'relationship', // v1.1.0 string shape
      last_event_epoch: 0, burst_count: 0, last_warning_epoch: 0,
    });
    runHook('session-end.mjs', { session_id: 's4', cwd: '/tmp' }, dir);
    const records = readJsonl(join(dir, 'sessions.jsonl'));
    const end = records.find(r => r.end);
    assert.ok(end);
    assert.equal(end.flags.pushback, 3);
    // v1.2: end record always carries an array, even when state had a string.
    assert.deepEqual(end.domain_context, ['relationship']);
  });

  it('writes v1.2 multi-domain array unchanged when state already has array', () => {
    dir = setupTestDir();
    createStateFile(dir, 's4b', {
      start_epoch: Math.floor(Date.now() / 1000) - 120, start_iso: '2026-01-01T10:00:00Z',
      tool_count: 2, edit_count: 1,
      dep_flags: 0, esc_flags: 0, fatigue_flags: 0, val_flags: 0,
      pushback_count: 1,
      domain_context: ['relationship', 'health'],
      last_event_epoch: 0, burst_count: 0, last_warning_epoch: 0,
    });
    runHook('session-end.mjs', { session_id: 's4b', cwd: '/tmp' }, dir);
    const records = readJsonl(join(dir, 'sessions.jsonl'));
    const end = records.find(r => r.end);
    assert.ok(end);
    assert.deepEqual(end.domain_context, ['relationship', 'health']);
  });

  it('backward-compat: state without pushback_count yields flags.pushback === 0 (not NaN/undefined)', () => {
    dir = setupTestDir();
    createStateFile(dir, 's5', {
      start_epoch: Math.floor(Date.now() / 1000) - 60, start_iso: '2026-01-01T10:00:00Z',
      tool_count: 1, edit_count: 0,
      dep_flags: 0, esc_flags: 0, fatigue_flags: 0, val_flags: 0,
      // pushback_count and domain_context intentionally absent (v1.0.0 state shape)
      last_event_epoch: 0, burst_count: 0, last_warning_epoch: 0,
    });
    runHook('session-end.mjs', { session_id: 's5', cwd: '/tmp' }, dir);
    const records = readJsonl(join(dir, 'sessions.jsonl'));
    const end = records.find(r => r.end);
    assert.ok(end);
    assert.equal(end.flags.pushback, 0);
    assert.notEqual(end.flags.pushback, undefined);
    assert.ok(!Number.isNaN(end.flags.pushback));
    // v1.2: empty domain becomes [] (not null) — always an array on disk.
    assert.deepEqual(end.domain_context, []);
  });
});