manifold/web/pages/swap.tsx

import {
  addPosition,
  buyYes,
  calculateLPCost,
  fromProb,
  getSwap3Probability,
  grossLiquidity,
  noShares,
  sortedTickStates,
  Swap3Pool,
  toProb,
  yesShares,
} from 'common/calculate-swap3'
import { formatPercent } from 'common/util/format'
import { useState } from 'react'
import { LiquidityGraph } from 'web/components/contract/liquidity-graph'
import { Col } from 'web/components/layout/col'
import { Row } from 'web/components/layout/row'
import { addLiquidity } from 'web/lib/firebase/fn-call'

const users: Record<string, any> = {
  alice: {
    M: 100,
    YES: 0,
    NO: 0,
  },
  bob: {
    M: 200,
    YES: 0,
    NO: 0,
  },
  kipply: {
    M: 300,
    YES: 0,
    NO: 0,
  },
}

function BalanceTable() {
  /* Display all users current M, YES, and NO in a table */
  return (
    <table className="w-full">
      <thead>
        <tr>
          <th className="px-4 py-2">User</th>
          <th className="px-4 py-2">M</th>
          <th className="px-4 py-2">YES</th>
          <th className="px-4 py-2">NO</th>
        </tr>
      </thead>
      <tbody>
        {Object.keys(users).map((user) => (
          <tr key={user}>
            <td className="px-4 py-2">{user}</td>
            <td className="px-4 py-2">{users[user].M}</td>
            <td className="px-4 py-2">{users[user].YES}</td>
            <td className="px-4 py-2">{users[user].NO}</td>
          </tr>
        ))}
      </tbody>
    </table>
  )
}

/* Show the values in pool */
function PoolTable(props: { pool: Swap3Pool }) {
  const { pool } = props
  return (
    <>
      <Row className="gap-4">
        <div>
          <label>Implied: </label>
          {formatPercent(getSwap3Probability(pool))}
        </div>

        <div>
          <label>Liquidity: </label>
          {pool.liquidity}
        </div>
        <div>
          <label>Tick: </label>
          {pool.tick}
        </div>
        <div>
          <label>Pool YES: </label>
          {yesShares(pool).toFixed(2)}
        </div>
        <div>
          <label>Pool NO: </label>
          {noShares(pool).toFixed(2)}
        </div>
      </Row>
      {/* Render each tickState as another row in a table */}
      <table className="w-full">
        <thead>
          <tr>
            <th className="px-4 py-2">Tick</th>
            <th className="px-4 py-2">Prob</th>
            <th className="px-4 py-2">Net Liquidity</th>
            <th className="px-4 py-2">Gross Liquidity</th>
          </tr>
        </thead>
        {sortedTickStates(pool).map((tickState, i) => (
          <tr key={i}>
            <td className="px-4 py-2">{tickState.tick}</td>
            <td className="px-4 py-2">
              {formatPercent(toProb(tickState.tick))}
            </td>
            <td className="px-4 py-2">{tickState.liquidityNet}</td>
            <td className="px-4 py-2">{tickState.liquidityGross}</td>
          </tr>
        ))}
      </table>
    </>
  )
}

function Graph(props: { pool: Swap3Pool }) {
  const { pool } = props
  const points = []
  let lastGross = 0
  for (const tickState of sortedTickStates(pool)) {
    const { tick, liquidityGross } = tickState
    points.push({ x: toProb(tick), y: lastGross })
    points.push({ x: toProb(tick), y: liquidityGross })
    lastGross = liquidityGross
  }
  return <LiquidityGraph points={points} marker={toProb(pool.tick)} />
}

export default function Swap() {
  // Set up an initial pool with 100 liquidity from 0% to 100%
  // TODO: Not sure why maxTick of 2**23 breaks it, but 2**20 is okay...
  let INIT_POOL: Swap3Pool = {
    liquidity: 0,
    tick: fromProb(0.3),
    tickStates: [],
  }
  INIT_POOL = addPosition(INIT_POOL, -(2 ** 23), 2 ** 20, 100)
  INIT_POOL = addPosition(INIT_POOL, fromProb(0.32), fromProb(0.35), 100)
  INIT_POOL = grossLiquidity(INIT_POOL)

  const [pool, setPool] = useState(INIT_POOL)

  const [minTick, setMinTick] = useState(0)
  const [maxTick, setMaxTick] = useState(0)
  const [buyAmount, setBuyAmount] = useState(0)

  const { requiredN, requiredY } = calculateLPCost(
    pool.tick,
    minTick,
    maxTick,
    100 // deltaL
  )

  const { newPoolTick, yesPurchased } = buyYes(pool, buyAmount)

  return (
    <Col className="mx-auto max-w-2xl gap-10 p-4">
      {/* <BalanceTable /> */}
      <PoolTable pool={pool} />
      <Graph pool={pool} />
      <input
        className="input"
        placeholder="Current%"
        type="number"
        onChange={(e) => {
          pool.tick = inputPercentToTick(e)
          setPool({ ...pool })
        }}
      />

      <Col>
        Alice: Add liquidity
        {/* <input className="input" placeholder="Amount" type="number" /> */}
        <input
          className="input"
          placeholder="Min%"
          type="number"
          onChange={(e) => setMinTick(inputPercentToTick(e))}
        />
        Min Tick: {minTick}
        <input
          className="input"
          placeholder="Max%"
          type="number"
          onChange={(e) => setMaxTick(inputPercentToTick(e))}
        />
        Max Tick: {maxTick}
        <Row className="gap-2 py-2">
          <div>Y required: {requiredY}</div>
          <div>N required: {requiredN}</div>{' '}
        </Row>
        <button
          className="btn"
          onClick={() => {
            addPosition(pool, minTick, maxTick, 100)
            grossLiquidity(pool)
            setPool({ ...pool })
          }}
        >
          Create pool
        </button>
      </Col>

      <Col>
        Bob: Buy Tokens
        {/* <input className="input" placeholder="User" type="text" /> */}
        <input
          className="input"
          placeholder="Amount"
          type="number"
          onChange={(e) => setBuyAmount(parseFloat(e.target.value))}
        />
        <Row className="gap-2 py-2">
          <div>Y shares purchaseable: {yesPurchased.toFixed(2)}</div>
          <div>New Tick: {newPoolTick}</div>
          <div>New prob: {formatPercent(toProb(newPoolTick))}</div>
        </Row>
        <Row className="gap-2">
          <button className="btn">Buy YES</button>
          {/* <button className="btn">Buy NO</button> */}
        </Row>
      </Col>
    </Col>
  )
}

function inputPercentToTick(event: React.ChangeEvent<HTMLInputElement>) {
  return fromProb(parseFloat(event.target.value) / 100)
}