/**
 * Unit tests for change-payment and change-plan functionality
 * Focus: SlippageConfig normalization and dynamic pricing detection
 */

describe('Change Payment/Plan Logic', () => {
  describe('normalizeSlippageConfig (frontend)', () => {
    type SlippageConfigValue = {
      mode: 'percent' | 'rate';
      percent: number;
      min_acceptable_rate?: string;
      base_currency?: string;
      updated_at_ms?: number;
    };

    const defaultSlippageConfig: SlippageConfigValue = { mode: 'percent', percent: 0.5 };

    const normalizeSlippageConfig = (rawConfig: any): SlippageConfigValue => {
      if (!rawConfig || typeof rawConfig !== 'object') {
        return defaultSlippageConfig;
      }
      const mode = rawConfig.mode === 'rate' ? 'rate' : 'percent';
      const percentValue = Number(rawConfig.percent);
      const percent = Number.isFinite(percentValue) && percentValue >= 0 ? percentValue : defaultSlippageConfig.percent;
      const minRate = typeof rawConfig.min_acceptable_rate === 'string' ? rawConfig.min_acceptable_rate : undefined;
      const baseCurrency = typeof rawConfig.base_currency === 'string' ? rawConfig.base_currency : undefined;
      const updatedAtMs = Number.isFinite(Number(rawConfig.updated_at_ms)) ? Number(rawConfig.updated_at_ms) : undefined;

      return {
        mode,
        percent,
        ...(mode === 'rate' && minRate ? { min_acceptable_rate: minRate } : {}),
        ...(baseCurrency ? { base_currency: baseCurrency } : {}),
        ...(updatedAtMs ? { updated_at_ms: updatedAtMs } : {}),
      };
    };

    it('should return default config for null input', () => {
      const result = normalizeSlippageConfig(null);
      expect(result).toEqual(defaultSlippageConfig);
    });

    it('should return default config for undefined input', () => {
      const result = normalizeSlippageConfig(undefined);
      expect(result).toEqual(defaultSlippageConfig);
    });

    it('should return default config for non-object input', () => {
      expect(normalizeSlippageConfig('string')).toEqual(defaultSlippageConfig);
      expect(normalizeSlippageConfig(123)).toEqual(defaultSlippageConfig);
      expect(normalizeSlippageConfig(true)).toEqual(defaultSlippageConfig);
    });

    it('should normalize percent mode config', () => {
      const rawConfig = {
        mode: 'percent',
        percent: 1.5,
        base_currency: 'USD',
      };
      const result = normalizeSlippageConfig(rawConfig);
      expect(result.mode).toBe('percent');
      expect(result.percent).toBe(1.5);
      expect(result.base_currency).toBe('USD');
    });

    it('should normalize rate mode config with min_acceptable_rate', () => {
      const rawConfig = {
        mode: 'rate',
        percent: 0.5,
        min_acceptable_rate: '95.5',
        base_currency: 'USD',
        updated_at_ms: 1234567890,
      };
      const result = normalizeSlippageConfig(rawConfig);
      expect(result.mode).toBe('rate');
      expect(result.percent).toBe(0.5);
      expect(result.min_acceptable_rate).toBe('95.5');
      expect(result.base_currency).toBe('USD');
      expect(result.updated_at_ms).toBe(1234567890);
    });

    it('should default to percent mode for unknown mode', () => {
      const rawConfig = {
        mode: 'unknown',
        percent: 0.5,
      };
      const result = normalizeSlippageConfig(rawConfig);
      expect(result.mode).toBe('percent');
    });

    it('should use default percent for invalid percent value', () => {
      const rawConfig = {
        mode: 'percent',
        percent: 'invalid',
      };
      const result = normalizeSlippageConfig(rawConfig);
      expect(result.percent).toBe(0.5); // default
    });

    it('should use default percent for negative percent value', () => {
      const rawConfig = {
        mode: 'percent',
        percent: -1,
      };
      const result = normalizeSlippageConfig(rawConfig);
      expect(result.percent).toBe(0.5); // default
    });

    it('should accept zero percent', () => {
      const rawConfig = {
        mode: 'percent',
        percent: 0,
      };
      const result = normalizeSlippageConfig(rawConfig);
      expect(result.percent).toBe(0);
    });

    it('should only include min_acceptable_rate for rate mode', () => {
      const percentConfig = {
        mode: 'percent',
        percent: 0.5,
        min_acceptable_rate: '95.5',
      };
      const result = normalizeSlippageConfig(percentConfig);
      expect(result.min_acceptable_rate).toBeUndefined();
    });

    it('should handle string percent values', () => {
      const rawConfig = {
        mode: 'percent',
        percent: '1.5',
      };
      const result = normalizeSlippageConfig(rawConfig);
      expect(result.percent).toBe(1.5);
    });
  });

  describe('Dynamic pricing detection (change-plan)', () => {
    type LineItem = {
      price?: {
        pricing_type?: string;
      };
      upsell_price?: {
        pricing_type?: string;
      };
    };

    const hasDynamicPricing = (items: LineItem[]): boolean => {
      return (
        items?.length > 0 &&
        items.some((item) => {
          const price = item.upsell_price || item.price;
          return price?.pricing_type === 'dynamic';
        })
      );
    };

    it('should return false for empty items', () => {
      expect(hasDynamicPricing([])).toBe(false);
    });

    it('should return false for items without dynamic pricing', () => {
      const items: LineItem[] = [
        { price: { pricing_type: 'fixed' } },
        { price: { pricing_type: 'fixed' } },
      ];
      expect(hasDynamicPricing(items)).toBe(false);
    });

    it('should return true for items with dynamic pricing', () => {
      const items: LineItem[] = [
        { price: { pricing_type: 'fixed' } },
        { price: { pricing_type: 'dynamic' } },
      ];
      expect(hasDynamicPricing(items)).toBe(true);
    });

    it('should check upsell_price first if present', () => {
      const items: LineItem[] = [
        {
          price: { pricing_type: 'fixed' },
          upsell_price: { pricing_type: 'dynamic' },
        },
      ];
      expect(hasDynamicPricing(items)).toBe(true);
    });

    it('should fall back to price if upsell_price is missing', () => {
      const items: LineItem[] = [{ price: { pricing_type: 'dynamic' } }];
      expect(hasDynamicPricing(items)).toBe(true);
    });

    it('should handle items with no pricing_type', () => {
      const items: LineItem[] = [{ price: {} }, { price: undefined }];
      expect(hasDynamicPricing(items as any)).toBe(false);
    });
  });

  describe('needsExchangeRate logic', () => {
    type PaymentMethod = {
      type: string;
    };

    const needsExchangeRate = (hasDynamicPricing: boolean, paymentMethod?: PaymentMethod): boolean => {
      return hasDynamicPricing && paymentMethod?.type !== 'stripe';
    };

    it('should return true for dynamic pricing with non-stripe payment', () => {
      expect(needsExchangeRate(true, { type: 'arcblock' })).toBe(true);
      expect(needsExchangeRate(true, { type: 'ethereum' })).toBe(true);
      expect(needsExchangeRate(true, { type: 'base' })).toBe(true);
    });

    it('should return false for dynamic pricing with stripe payment', () => {
      expect(needsExchangeRate(true, { type: 'stripe' })).toBe(false);
    });

    it('should return false for static pricing', () => {
      expect(needsExchangeRate(false, { type: 'arcblock' })).toBe(false);
      expect(needsExchangeRate(false, { type: 'stripe' })).toBe(false);
    });

    it('should handle missing payment method', () => {
      expect(needsExchangeRate(true, undefined)).toBe(true);
    });
  });

  describe('slippage config payload building (change-payment)', () => {
    it('should build payload with base_currency from liveRateInfo', () => {
      const nextConfig: { mode: 'percent'; percent: number; base_currency?: string } = {
        mode: 'percent' as const,
        percent: 0.5,
      };
      const liveRateInfo = {
        base_currency: 'USD',
        rate: '100.5',
      };

      const payloadConfig = {
        ...nextConfig,
        ...(nextConfig.base_currency ? {} : { base_currency: liveRateInfo?.base_currency || 'USD' }),
      };

      expect(payloadConfig.base_currency).toBe('USD');
    });

    it('should preserve existing base_currency in config', () => {
      const nextConfig = {
        mode: 'percent' as const,
        percent: 0.5,
        base_currency: 'EUR',
      };
      const liveRateInfo = {
        base_currency: 'USD',
      };

      const payloadConfig = {
        ...nextConfig,
        ...(nextConfig.base_currency ? {} : { base_currency: liveRateInfo?.base_currency || 'USD' }),
      };

      expect(payloadConfig.base_currency).toBe('EUR');
    });

    it('should default to USD if liveRateInfo is unavailable', () => {
      const nextConfig: { mode: 'percent'; percent: number; base_currency?: string } = {
        mode: 'percent' as const,
        percent: 0.5,
      };
      // Simulate liveRateInfo being undefined
      const liveRateInfo = null as { base_currency?: string } | null;
      const baseCurrencyFallback = liveRateInfo?.base_currency || 'USD';

      const payloadConfig = {
        ...nextConfig,
        ...(nextConfig.base_currency ? {} : { base_currency: baseCurrencyFallback }),
      };

      expect(payloadConfig.base_currency).toBe('USD');
    });
  });
});
