// Mock CouchDB service for testing
jest.mock('../../services/couchdbService', () => ({
  createDocument: jest.fn(),
  findDocumentById: jest.fn(),
  updateDocument: jest.fn(),
  findByType: jest.fn(),
}));

const Reward = require('../../models/Reward');
const User = require('../../models/User');
const couchdbService = require('../../services/couchdbService');

describe('Reward Model', () => {
  beforeEach(() => {
    jest.clearAllMocks();
    // Reset all mocks to ensure clean state
    couchdbService.createDocument.mockReset();
    couchdbService.findDocumentById.mockReset();
    couchdbService.updateDocument.mockReset();
    couchdbService.findByType.mockReset();
  });

  describe('Schema Validation', () => {
    it('should create a valid reward', async () => {
      const rewardData = {
        name: 'Coffee Voucher',
        description: 'Get a free coffee at participating cafes',
        cost: 50,
        category: 'food',
      };

      const mockCreated = {
        _id: 'reward_123',
        _rev: '1-abc',
        type: 'reward',
        ...rewardData,
        isActive: true,
        redeemedBy: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      couchdbService.createDocument.mockResolvedValue(mockCreated);

      const reward = await Reward.create(rewardData);

      expect(reward._id).toBeDefined();
      expect(reward.name).toBe(rewardData.name);
      expect(reward.description).toBe(rewardData.description);
      expect(reward.cost).toBe(rewardData.cost);
      expect(reward.category).toBe(rewardData.category);
      expect(reward.isActive).toBe(true);
    });

    it('should require name field', async () => {
      const rewardData = {
        description: 'Reward without name',
        cost: 50,
      };

      expect(() => new Reward(rewardData)).toThrow();
    });

    it('should require description field', async () => {
      const rewardData = {
        name: 'Reward without description',
        cost: 50,
      };

      expect(() => new Reward(rewardData)).toThrow();
    });

    it('should require cost field', async () => {
      const rewardData = {
        name: 'Reward without cost',
        description: 'This reward has no cost',
      };

      expect(() => new Reward(rewardData)).toThrow();
    });

    it('should validate cost is a positive number', async () => {
      const rewardData = {
        name: 'Invalid Cost Reward',
        description: 'This reward has negative cost',
        cost: -10,
      };

      expect(() => new Reward(rewardData)).toThrow();
    });
  });

  describe('Default Values', () => {
    it('should default isActive to true', async () => {
      const rewardData = {
        name: 'Default Active Reward',
        description: 'Testing default active status',
        cost: 25,
      };

      const mockCreated = {
        _id: 'reward_123',
        _rev: '1-abc',
        type: 'reward',
        ...rewardData,
        isActive: true,
        redeemedBy: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      couchdbService.createDocument.mockResolvedValue(mockCreated);

      const reward = await Reward.create(rewardData);

      expect(reward.isActive).toBe(true);
    });

    it('should default redeemedBy to empty array', async () => {
      const rewardData = {
        name: 'Default Redeemed Reward',
        description: 'Testing default redeemed array',
        cost: 25,
      };

      const mockCreated = {
        _id: 'reward_123',
        _rev: '1-abc',
        type: 'reward',
        ...rewardData,
        isActive: true,
        redeemedBy: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      couchdbService.createDocument.mockResolvedValue(mockCreated);

      const reward = await Reward.create(rewardData);

      expect(reward.redeemedBy).toEqual([]);
      expect(reward.redeemedBy).toHaveLength(0);
    });
  });

  describe('Categories', () => {
    const validCategories = ['food', 'merchandise', 'digital', 'experience', 'donation'];

    validCategories.forEach(category => {
      it(`should accept "${category}" as valid category`, async () => {
        const rewardData = {
          name: `${category} Reward`,
          description: `Testing ${category} category`,
          cost: 50,
          category,
        };

        const mockCreated = {
          _id: 'reward_123',
          _rev: '1-abc',
          type: 'reward',
          ...rewardData,
          isActive: true,
          redeemedBy: [],
          createdAt: '2023-01-01T00:00:00.000Z',
          updatedAt: '2023-01-01T00:00:00.000Z'
        };

        couchdbService.createDocument.mockResolvedValue(mockCreated);

        const reward = await Reward.create(rewardData);

        expect(reward.category).toBe(category);
      });
    });
  });

  describe('Cost Validation', () => {
    it('should accept valid cost values', async () => {
      const validCosts = [10, 25, 50, 100, 500, 1000];

      for (const cost of validCosts) {
        const rewardData = {
          name: `Reward costing ${cost} points`,
          description: `Testing cost of ${cost}`,
          cost,
        };

        const mockCreated = {
          _id: 'reward_123',
          _rev: '1-abc',
          type: 'reward',
          ...rewardData,
          isActive: true,
          redeemedBy: [],
          createdAt: '2023-01-01T00:00:00.000Z',
          updatedAt: '2023-01-01T00:00:00.000Z'
        };

        couchdbService.createDocument.mockResolvedValue(mockCreated);

        const reward = await Reward.create(rewardData);

        expect(reward.cost).toBe(cost);
      }
    });

    it('should reject zero cost', async () => {
      const rewardData = {
        name: 'Free Reward',
        description: 'This reward should not be free',
        cost: 0,
      };

      expect(() => new Reward(rewardData)).toThrow();
    });
  });

  describe('Active Status', () => {
    it('should allow setting active status', async () => {
      const rewardData = {
        name: 'Inactive Reward',
        description: 'This reward is inactive',
        cost: 100,
        isActive: false,
      };

      const mockCreated = {
        _id: 'reward_123',
        _rev: '1-abc',
        type: 'reward',
        ...rewardData,
        redeemedBy: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      couchdbService.createDocument.mockResolvedValue(mockCreated);

      const reward = await Reward.create(rewardData);

      expect(reward.isActive).toBe(false);
    });

    it('should allow toggling active status', async () => {
      const rewardData = {
        name: 'Toggle Reward',
        description: 'Testing status toggle',
        cost: 75,
        isActive: true,
      };

      const mockReward = {
        _id: 'reward_123',
        _rev: '1-abc',
        type: 'reward',
        ...rewardData,
        redeemedBy: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      couchdbService.findDocumentById.mockResolvedValue(mockReward);
      couchdbService.updateDocument.mockResolvedValue({
        ...mockReward,
        isActive: false,
        _rev: '2-def'
      });

      const reward = await Reward.findById('reward_123');
      reward.isActive = false;
      await reward.save();

      expect(reward.isActive).toBe(false);
    });
  });

  describe('Redeemed By', () => {
    it('should track users who redeemed the reward', async () => {
      const rewardData = {
        name: 'Popular Reward',
        description: 'Many users want this',
        cost: 50,
        redeemedBy: [
          {
            userId: 'user_123',
            name: 'User 1',
            redeemedAt: '2023-11-01T10:00:00.000Z'
          },
          {
            userId: 'user_456',
            name: 'User 2',
            redeemedAt: '2023-11-02T10:00:00.000Z'
          }
        ]
      };

      const mockCreated = {
        _id: 'reward_123',
        _rev: '1-abc',
        type: 'reward',
        ...rewardData,
        isActive: true,
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      couchdbService.createDocument.mockResolvedValue(mockCreated);

      const reward = await Reward.create(rewardData);

      expect(reward.redeemedBy).toHaveLength(2);
      expect(reward.redeemedBy[0].userId).toBe('user_123');
      expect(reward.redeemedBy[1].userId).toBe('user_456');
    });

    it('should allow adding redemption records', async () => {
      const rewardData = {
        name: 'Redeemed Reward',
        description: 'Testing redemption tracking',
        cost: 25,
      };

      const mockReward = {
        _id: 'reward_123',
        _rev: '1-abc',
        type: 'reward',
        ...rewardData,
        isActive: true,
        redeemedBy: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      couchdbService.findDocumentById.mockResolvedValue(mockReward);
      couchdbService.updateDocument.mockResolvedValue({
        ...mockReward,
        redeemedBy: [
          {
            userId: 'user_789',
            name: 'User 3',
            redeemedAt: '2023-11-03T10:00:00.000Z'
          }
        ],
        _rev: '2-def'
      });

      const reward = await Reward.findById('reward_123');
      reward.redeemedBy.push({
        userId: 'user_789',
        name: 'User 3',
        redeemedAt: '2023-11-03T10:00:00.000Z'
      });
      await reward.save();

      expect(reward.redeemedBy).toHaveLength(1);
      expect(reward.redeemedBy[0].userId).toBe('user_789');
    });
  });

  describe('Timestamps', () => {
    it('should automatically set createdAt and updatedAt', async () => {
      const rewardData = {
        name: 'Timestamp Reward',
        description: 'Testing timestamps',
        cost: 30,
      };

      const mockCreated = {
        _id: 'reward_123',
        _rev: '1-abc',
        type: 'reward',
        ...rewardData,
        isActive: true,
        redeemedBy: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      couchdbService.createDocument.mockResolvedValue(mockCreated);

      const reward = await Reward.create(rewardData);

      expect(reward.createdAt).toBeDefined();
      expect(reward.updatedAt).toBeDefined();
      expect(typeof reward.createdAt).toBe('string');
      expect(typeof reward.updatedAt).toBe('string');
    });

    it('should update updatedAt on modification', async () => {
      const rewardData = {
        name: 'Update Test Reward',
        description: 'Testing update timestamp',
        cost: 40,
      };

      const mockReward = {
        _id: 'reward_123',
        _rev: '1-abc',
        type: 'reward',
        ...rewardData,
        isActive: true,
        redeemedBy: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      couchdbService.findDocumentById.mockResolvedValue(mockReward);
      couchdbService.updateDocument.mockResolvedValue({
        ...mockReward,
        isActive: false,
        _rev: '2-def',
        updatedAt: '2023-01-01T00:00:01.000Z'
      });

      const reward = await Reward.findById('reward_123');
      const originalUpdatedAt = reward.updatedAt;

      reward.isActive = false;
      await reward.save();

      expect(reward.updatedAt).not.toBe(originalUpdatedAt);
    });
  });

  describe('Static Methods', () => {
    it('should find reward by ID', async () => {
      const mockReward = {
        _id: 'reward_123',
        _rev: '1-abc',
        type: 'reward',
        name: 'Test Reward',
        description: 'Test description',
        cost: 50,
        isActive: true,
        redeemedBy: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      couchdbService.findDocumentById.mockResolvedValue(mockReward);

      const reward = await Reward.findById('reward_123');
      expect(reward).toBeDefined();
      expect(reward._id).toBe('reward_123');
      expect(reward.name).toBe('Test Reward');
    });

    it('should return null when reward not found', async () => {
      couchdbService.findDocumentById.mockResolvedValue(null);

      const reward = await Reward.findById('nonexistent');
      expect(reward).toBeNull();
    });
  });
});