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

const makePool = (overrides: Record<string, unknown> = {}) => ({
  token0: jest.fn().mockResolvedValue('0x1'),
  token1: jest.fn().mockResolvedValue('0x2'),
  tickSpacing: jest.fn().mockResolvedValue(10),
  slot0: jest.fn().mockResolvedValue({
    sqrtPriceX96: 79228162514264337593543950336n,
    unlocked: true,
  }),
  ...overrides,
});

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

describe('Shadow router helpers', () => {
  it('fractionAbsoluteValue returns positive numerator and denominator', () => {
    const frac = new Fraction(-8, 9);
    const abs = fractionAbsoluteValue(frac);
    expect(abs.numerator.toString()).toBe('8');
    expect(abs.denominator.toString()).toBe('9');
  });

  it('calculateAmountToSwap handles zero and infinite ratios', () => {
    const zeroRatio = new Fraction(0, 1);
    expect(calculateAmountToSwap(zeroRatio, 1n, true, 6n, 2n)).toBe(6n);
    expect(() => calculateAmountToSwap(zeroRatio, 1n, false, 6n, 2n)).toThrow(
      'wrong parameters',
    );

    const infRatio = new Fraction(1, 0);
    expect(calculateAmountToSwap(infRatio, 1n, false, 6n, 2n)).toBe(2n);
    expect(() => calculateAmountToSwap(infRatio, 1n, true, 6n, 2n)).toThrow(
      'wrong parameters',
    );
  });
});

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

  it('returns zero when already balanced', async () => {
    const pool = makePool();
    const quoter = makeQuoter();
    const logger = { info: jest.fn() } as any;
    const router = new ShadowCustomRouter(quoter as any, logger);

    const result = await router.getSwapAmount(
      pool as any,
      positions as any,
      1n,
      1n,
      '0x1',
      '0x2',
      3000,
      1,
      new Fraction(1, 1),
    );

    expect(result.amountToSwap).toBe(0n);
  });

  it('throws when pool is not initialized', async () => {
    const pool = makePool({
      slot0: jest.fn().mockResolvedValue({ sqrtPriceX96: 1n, unlocked: false }),
    });
    const quoter = makeQuoter();
    const logger = { info: jest.fn() } as any;
    const router = new ShadowCustomRouter(quoter as any, logger);

    await expect(
      router.getSwapAmount(
        pool as any,
        positions as any,
        1n,
        1n,
        '0x1',
        '0x2',
        3000,
        1,
      ),
    ).rejects.toThrow('Pool is not initialized');
  });

  it('returns zero when swap amount is non-positive', async () => {
    const pool = makePool();
    const quoter = makeQuoter();
    const logger = { info: jest.fn() } as any;
    const router = new ShadowCustomRouter(quoter as any, logger);

    const module = require('../../src/routers/shadow/shadow-router');
    const spy = jest.spyOn(module, 'calculateAmountToSwap').mockReturnValue(0n);

    const result = await router.getSwapAmount(
      pool as any,
      positions as any,
      10n,
      20n,
      '0x1',
      '0x2',
      3000,
      1,
    );

    spy.mockRestore();
    expect(result.amountToSwap).toBe(0n);
  });

  it('throws for invalid parameters', async () => {
    const pool = makePool();
    const quoter = makeQuoter();
    const logger = { info: jest.fn() } as any;
    const router = new ShadowCustomRouter(quoter as any, logger);

    await expect(
      router.getSwapAmount(
        pool as any,
        [{ lowerTick: -60, upperTick: -60, weight: 1 }] as any,
        10n,
        20n,
        '0x1',
        '0x2',
        3000,
        1,
      ),
    ).rejects.toThrow('lowerTick must be less than upperTick');
  });
});