206 lines
7.1 KiB
Vue
206 lines
7.1 KiB
Vue
<template>
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<div>
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<div>
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<button type="button" :class="yesClass" class="label success font-mono mx-1 my-3"
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@click.prevent="toggleYes">YES</button>
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<button type="button" :class="noClass" class="label error font-mono mx-1 my-3" @click.prevent="toggleNo">NO</button>
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</div>
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<form v-if="side === 'BUY'" v-show="showForm" @submit.prevent="submitBuyForm">
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<label v-if="session.isAuthenticated">you have:</label>
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<label v-if="session.isAuthenticated">{{ session.msats / 1000 }} sats and {{ userShares }} shares</label>
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<label v-if="session.isAuthenticated">sell?</label>
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<input v-if="session.isAuthenticated" v-model="side" true-value="SELL" false-value="BUY" type="checkbox" class="m-1"
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:disabled="userShares === 0" />
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<label for="stake">how much?</label>
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<input id="stake" v-model="stake" type="number" min="0" placeholder="sats" required />
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<label for="certainty">how sure?</label>
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<input id="certainty" v-model="certainty" type="number" min="0.01" max="0.99" step="0.01" required />
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<label>you receive:</label>
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<label>{{ format(buyShares) }} {{ selected }} shares @ {{ format(buyPrice) }} sats</label>
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<label>you pay:</label>
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<label>{{ format(buyCost) }} sats</label>
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<label>if you win:</label>
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<label>+{{ format(buyProfit) }} sats</label>
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<button class="col-span-2" type="submit">submit buy order</button>
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</form>
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<form v-else v-show="showForm" @submit.prevent="submitSellForm">
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<label v-if="session.isAuthenticated">you have:</label>
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<label v-if="session.isAuthenticated">{{ session.msats / 1000 }} sats and {{ userShares }} shares</label>
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<label v-if="session.isAuthenticated">sell?</label>
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<input v-if="session.isAuthenticated" v-model="side" true-value="SELL" false-value="BUY" type="checkbox" class="m-1"
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:disabled="userShares === 0" />
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<label for="shares">how many?</label>
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<input id="shares" v-model="sellShares" type="number" min="1" :max="userShares" placeholder="shares" required />
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<label for="price">price?</label>
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<input id="price" v-model="sellPrice" type="number" min="1" max="99" step="1" required />
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<label>you sell:</label>
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<label>{{ sellShares }} {{ selected }} shares @ {{ format(sellPrice) }} sats</label>
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<label>you make:</label>
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<label>+{{ format(sellProfit) }} sats</label>
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<button class="col-span-2" type="submit" :disabled="userShares === 0">submit sell order</button>
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</form>
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<div v-if="err" class="red text-center">{{ err }}</div>
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<div v-if="success" class="green text-center">{{ success }}</div>
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</div>
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</template>
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<script setup>
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import { useSession } from '@/stores/session'
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import { ref, computed } from 'vue'
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import { useRoute, useRouter } from 'vue-router'
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const session = useSession()
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const router = useRouter()
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const route = useRoute()
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const marketId = route.params.id
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// YES NO button logic
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// -- which button was pressed?
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const selected = ref(route.query.share || null)
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// -- button css
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const yesClass = computed(() => selected.value === 'YES' ? ['active'] : [])
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const noClass = computed(() => selected.value === 'NO' ? ['active'] : [])
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// -- show form if any button was pressed
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const showForm = computed(() => selected.value !== null)
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const toggleYes = () => {
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selected.value = selected.value === 'YES' ? null : 'YES'
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}
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const toggleNo = () => {
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selected.value = selected.value === 'NO' ? null : 'NO'
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}
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// show error and success below form
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const err = ref(null)
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const success = ref(null)
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// BUY or SELL?
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const side = ref(route.query.side || 'BUY')
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// -- BUY params
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// how much wants the user bet?
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const stake = ref(route.query.stake || 100)
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// how sure is the user he will win?
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const certainty = ref(route.query.certainty || 0.5)
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const buyPrice = computed(() => Math.round(certainty.value * 100))
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const buyShares = computed(() => {
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const val = buyPrice.value > 0 ? stake.value / buyPrice.value : null
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// only full shares can be bought
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return Math.round(val)
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})
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// how much does this order cost?
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const buyCost = computed(() => {
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return buyShares.value * buyPrice.value
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})
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// how high is the potential reward?
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const buyProfit = computed(() => {
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// shares expire at 10 or 0 sats
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const val = (100 * buyShares.value) - buyCost.value
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return isNaN(val) ? 0 : val
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})
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// -- SELL params
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// how many shares does the user own?
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const userShares = computed(() => (((selected.value === 'YES' ? market.value.user?.YES : market.value.user?.NO) || 0) - sold.value))
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// how many shares does the user want to sell?
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const sellShares = ref(2)
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// at which price wants the user to sell each share?
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const sellPrice = ref(50)
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const sellProfit = computed(() => sellShares.value * sellPrice.value)
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// how many share did the user sell since we refreshed our data?
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const sold = ref(0)
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const format = (x, i = 3) => x === null ? null : x >= 1 ? Math.round(x) : x === 0 ? x : x.toFixed(i)
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// Fetch market data
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const market = ref(null)
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const url = '/api/market/' + marketId
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await fetch(url)
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.then(r => r.json())
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.then(body => {
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market.value = body
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})
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.catch(console.error)
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// Currently, we only support binary markets.
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// (only events which can be answered with YES and NO)
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const yesShareId = computed(() => {
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return market?.value.Shares.find(s => s.Description === 'YES').Id
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})
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const noShareId = computed(() => {
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return market?.value.Shares.find(s => s.Description === 'NO').Id
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})
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const shareId = computed(() => {
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return selected.value === 'YES' ? yesShareId.value : noShareId.value
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})
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const submitBuyForm = async () => {
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if (!session.isAuthenticated) return router.push('/login')
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// TODO validate form
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const url = window.origin + '/api/order'
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const body = JSON.stringify({
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sid: shareId.value,
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quantity: buyShares.value,
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price: buyPrice.value,
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side: 'BUY'
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})
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const res = await fetch(url, { method: 'POST', headers: { 'Content-type': 'application/json' }, body })
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const resBody = await res.json()
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if (res.status !== 402) {
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err.value = `error: server responded with HTTP ${resBody.status}`
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return
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}
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const invoiceId = resBody.id
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router.push('/invoice/' + invoiceId)
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}
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const submitSellForm = async () => {
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if (!session.isAuthenticated) return router.push('/login')
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// TODO validate form
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const url = window.origin + '/api/order'
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const body = JSON.stringify({
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sid: shareId.value,
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quantity: sellShares.value,
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price: sellPrice.value,
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side: 'SELL'
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})
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const res = await fetch(url, { method: 'POST', headers: { 'Content-type': 'application/json' }, body })
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const resBody = await res.json()
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if (res.status === 201) {
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success.value = 'Order created'
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return
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}
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if (res.status !== 402) {
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err.value = `error: server responded with HTTP ${resBody.status}`
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return
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}
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const invoiceId = resBody.id
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router.push('/invoice/' + invoiceId)
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}
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</script>
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<style scoped>
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.success.active {
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background-color: #35df8d;
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color: white;
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}
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.error.active {
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background-color: #ff7386;
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color: white;
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}
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form {
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margin: 0 auto;
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display: grid;
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grid-template-columns: auto auto;
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}
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form>* {
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margin: 0.5em 1em;
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}
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label {
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display: flex;
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align-items: center;
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justify-content: center;
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}
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</style>
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