import { Fraction } from '@uniswap/sdk-core';
import {
  ThickV2CustomRouter,
  calculateAmountToSwap,
  fractionAbsoluteValue,
} from '../../src/routers/thickv2/thickv2-router';

jest.mock('../../src/routers/base/base-router', () => {
  return {
    BaseRouter: jest.fn().mockImplementation(() => ({
      getSwapAmount: jest
        .fn()
        .mockResolvedValue({ amountToSwap: 5n, zeroForOne: true }),
    })),
  };
});

const makePool = (overrides: Record<string, unknown> = {}) => ({
  slot0: jest
    .fn()
    .mockResolvedValue({ sqrtPriceX96: 79228162514264337593543950336n }),
  ...overrides,
});

const makeQuoter = () => ({
  callStatic: {
    quoteExactInputSingle: jest.fn().mockResolvedValue({
      amountOut: 1n,
      sqrtPriceX96After: 2n,
    }),
  },
});

describe('ThickV2 router helpers', () => {
  it('fractionAbsoluteValue returns positive numerator and denominator', () => {
    const frac = new Fraction(-10, 11);
    const abs = fractionAbsoluteValue(frac);
    expect(abs.numerator.toString()).toBe('10');
    expect(abs.denominator.toString()).toBe('11');
  });

  it('calculateAmountToSwap handles zero and infinite ratios', () => {
    const zeroRatio = new Fraction(0, 1);
    expect(calculateAmountToSwap(zeroRatio, 1n, true, 5n, 2n)).toBe(5n);
    expect(() => calculateAmountToSwap(zeroRatio, 1n, false, 5n, 2n)).toThrow(
      'wrong parameters',
    );

    const infRatio = new Fraction(1, 0);
    expect(calculateAmountToSwap(infRatio, 1n, false, 5n, 2n)).toBe(2n);
    expect(() => calculateAmountToSwap(infRatio, 1n, true, 5n, 2n)).toThrow(
      'wrong parameters',
    );
  });
});

describe('ThickV2CustomRouter', () => {
  const positions = [{ lowerTick: -60, upperTick: 60, weight: 1 }];

  it('uses fallback when legacy flow fails', async () => {
    const pool = makePool({
      slot0: jest.fn().mockResolvedValue({
        sqrtPriceX96: 79228162514264337593543950336n,
      }),
    });
    const quoter = makeQuoter();
    const logger = { info: jest.fn() } as any;
    const router = new ThickV2CustomRouter(quoter as any, logger);

    const result = await router.getSwapAmount(
      pool as any,
      positions as any,
      10n,
      20n,
      '0x1',
      '0x2',
      10,
      2,
    );

    const baseRouterModule = require('../../src/routers/base/base-router');
    const baseRouterInstance =
      baseRouterModule.BaseRouter.mock.results[0].value;
    expect(baseRouterInstance.getSwapAmount).toHaveBeenCalled();
    expect(result).toEqual({ amountToSwap: 5n, zeroForOne: true });
  });

  it('throws when fallback fails', async () => {
    const baseRouterModule = require('../../src/routers/base/base-router');
    baseRouterModule.BaseRouter.mockImplementationOnce(() => ({
      getSwapAmount: jest.fn().mockRejectedValue(new Error('fallback failed')),
    }));

    const pool = makePool();
    const quoter = makeQuoter();
    const logger = { info: jest.fn() } as any;
    const router = new ThickV2CustomRouter(quoter as any, logger);

    await expect(
      router.getSwapAmount(
        pool as any,
        positions as any,
        10n,
        20n,
        '0x1',
        '0x2',
        10,
        2,
      ),
    ).rejects.toThrow('fallback failed');
  });
});