import {
  CROSS_TAB_CHANNEL_NAME,
  CROSS_TAB_STORAGE_KEY,
  CROSS_TAB_ROLE_CHANNEL_NAME,
  CROSS_TAB_ROLE_STORAGE_KEY,
  CrossTabInvalidationMessage,
  CrossTabRoleChangeMessage,
  applyRoleChangeToUser,
  encodeInvalidationMessage,
  encodeRoleChangeMessage,
  isCrossTabInvalidationMessage,
  isCrossTabRoleChangeMessage,
  isStorageInvalidationEvent,
  isStorageRoleChangeEvent,
} from '../../frontend/src/app/core/services/auth-session-events.pure';

describe('auth-session-events.pure', () => {
  describe('encodeInvalidationMessage', () => {
    it('produces a session-invalidated message with origin and timestamp', () => {
      const before = Date.now();
      const msg = encodeInvalidationMessage('tab-A');
      const after = Date.now();
      expect(msg.type).toBe('session-invalidated');
      expect(msg.origin).toBe('tab-A');
      expect(msg.ts).toBeGreaterThanOrEqual(before);
      expect(msg.ts).toBeLessThanOrEqual(after);
    });
  });

  describe('isCrossTabInvalidationMessage', () => {
    it('accepts a properly shaped message', () => {
      const msg: CrossTabInvalidationMessage = {
        type: 'session-invalidated',
        origin: 'x',
        ts: 1,
      };
      expect(isCrossTabInvalidationMessage(msg)).toBe(true);
    });

    it('rejects non-objects', () => {
      expect(isCrossTabInvalidationMessage(null)).toBe(false);
      expect(isCrossTabInvalidationMessage(undefined)).toBe(false);
      expect(isCrossTabInvalidationMessage('string')).toBe(false);
      expect(isCrossTabInvalidationMessage(42)).toBe(false);
    });

    it('rejects objects with wrong type or missing fields', () => {
      expect(isCrossTabInvalidationMessage({ type: 'other', origin: 'a', ts: 1 })).toBe(false);
      expect(isCrossTabInvalidationMessage({ type: 'session-invalidated', origin: 1, ts: 1 })).toBe(
        false,
      );
      expect(isCrossTabInvalidationMessage({ type: 'session-invalidated', origin: 'a' })).toBe(
        false,
      );
      expect(
        isCrossTabInvalidationMessage({ type: 'session-invalidated', origin: 'a', ts: 'now' }),
      ).toBe(false);
    });
  });

  describe('isStorageInvalidationEvent', () => {
    it('accepts a well-formed storage event for the namespaced key', () => {
      const ev = {
        key: CROSS_TAB_STORAGE_KEY,
        newValue: JSON.stringify(encodeInvalidationMessage('tab-X')),
      };
      expect(isStorageInvalidationEvent(ev)).toBe(true);
    });

    it('rejects events with a different key', () => {
      const ev = {
        key: 'other.key',
        newValue: JSON.stringify(encodeInvalidationMessage('tab-X')),
      };
      expect(isStorageInvalidationEvent(ev)).toBe(false);
    });

    it('rejects events with no newValue (cleared key)', () => {
      const ev = { key: CROSS_TAB_STORAGE_KEY, newValue: null };
      expect(isStorageInvalidationEvent(ev)).toBe(false);
    });

    it('rejects malformed JSON payloads', () => {
      const ev = { key: CROSS_TAB_STORAGE_KEY, newValue: 'not-json' };
      expect(isStorageInvalidationEvent(ev)).toBe(false);
    });

    it('rejects nullish events', () => {
      expect(isStorageInvalidationEvent(null)).toBe(false);
      expect(isStorageInvalidationEvent(undefined)).toBe(false);
    });
  });

  describe('constant exports', () => {
    it('exposes a stable channel name and storage key', () => {
      expect(CROSS_TAB_CHANNEL_NAME).toBe('hipctf.auth.v1');
      expect(CROSS_TAB_STORAGE_KEY).toBe('hipctf.auth.invalidate.v1');
      expect(CROSS_TAB_ROLE_CHANNEL_NAME).toBe('hipctf.auth.role.v1');
      expect(CROSS_TAB_ROLE_STORAGE_KEY).toBe('hipctf.role.invalidate.v1');
    });
  });

  describe('encodeRoleChangeMessage', () => {
    it('produces a role-changed message with userId and newRole', () => {
      const before = Date.now();
      const msg = encodeRoleChangeMessage('tab-A', 'user-1', 'player');
      const after = Date.now();
      expect(msg.type).toBe('role-changed');
      expect(msg.origin).toBe('tab-A');
      expect(msg.userId).toBe('user-1');
      expect(msg.newRole).toBe('player');
      expect(msg.ts).toBeGreaterThanOrEqual(before);
      expect(msg.ts).toBeLessThanOrEqual(after);
    });
  });

  describe('isCrossTabRoleChangeMessage', () => {
    it('accepts a properly shaped message', () => {
      const msg: CrossTabRoleChangeMessage = {
        type: 'role-changed',
        origin: 'x',
        ts: 1,
        userId: 'u1',
        newRole: 'player',
      };
      expect(isCrossTabRoleChangeMessage(msg)).toBe(true);
    });

    it('rejects a session-invalidated message (does not double-fire)', () => {
      const msg: CrossTabInvalidationMessage = { type: 'session-invalidated', origin: 'x', ts: 1 };
      expect(isCrossTabRoleChangeMessage(msg)).toBe(false);
    });

    it('rejects objects with wrong/missing fields', () => {
      expect(isCrossTabRoleChangeMessage({ type: 'role-changed', origin: 'a', ts: 1, userId: 'u', newRole: 'super' })).toBe(
        false,
      );
      expect(isCrossTabRoleChangeMessage({ type: 'role-changed', origin: 'a', ts: 1, userId: 1, newRole: 'admin' })).toBe(
        false,
      );
      expect(isCrossTabRoleChangeMessage({ type: 'role-changed', origin: 'a', ts: 'now', userId: 'u', newRole: 'admin' })).toBe(
        false,
      );
    });

    it('rejects non-objects', () => {
      expect(isCrossTabRoleChangeMessage(null)).toBe(false);
      expect(isCrossTabRoleChangeMessage(undefined)).toBe(false);
      expect(isCrossTabRoleChangeMessage('string')).toBe(false);
    });
  });

  describe('isStorageRoleChangeEvent', () => {
    it('accepts a well-formed storage event for the role key', () => {
      const ev = {
        key: CROSS_TAB_ROLE_STORAGE_KEY,
        newValue: JSON.stringify(encodeRoleChangeMessage('tab-X', 'u1', 'player')),
      };
      expect(isStorageRoleChangeEvent(ev)).toBe(true);
    });

    it('rejects events with a different key', () => {
      const ev = {
        key: 'something.else',
        newValue: JSON.stringify(encodeRoleChangeMessage('tab-X', 'u1', 'player')),
      };
      expect(isStorageRoleChangeEvent(ev)).toBe(false);
    });

    it('rejects malformed JSON payloads', () => {
      const ev = { key: CROSS_TAB_ROLE_STORAGE_KEY, newValue: 'not-json' };
      expect(isStorageRoleChangeEvent(ev)).toBe(false);
    });

    it('rejects nullish events', () => {
      expect(isStorageRoleChangeEvent(null)).toBe(false);
      expect(isStorageRoleChangeEvent(undefined)).toBe(false);
    });
  });

  describe('applyRoleChangeToUser', () => {
    it('returns a new user with the updated role when they differ', () => {
      const u = { id: 'u1', role: 'admin' as const };
      const out = applyRoleChangeToUser(u, 'player');
      expect(out).toEqual({ id: 'u1', role: 'player' });
      expect(out).not.toBe(u);
    });

    it('returns the same user object (no-op) when role already matches', () => {
      const u = { id: 'u1', role: 'player' as const };
      const out = applyRoleChangeToUser(u, 'player');
      expect(out).toBe(u);
    });

    it('returns the input untouched for null users', () => {
      expect(applyRoleChangeToUser(null, 'admin')).toBeNull();
    });
  });
});