🎉 init

server/api/pots/[slug].get.ts

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+import { calculateBalances } from '../../../shared/utils/balances'
+
+export default defineEventHandler(async (event) => {
+  const slug = getRouterParam(event, 'slug')!
+
+  const pot = await getPotOrThrow(slug)
+  const participants = await getParticipants(slug)
+  const expenses = await getExpensesWithParticipants(slug)
+  const { netBalances, settlements } = calculateBalances(participants, expenses)
+
+  return { pot, participants, expenses, netBalances, settlements }
+})

server/api/pots/[slug]/expenses.post.ts

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+import { useDb } from '../../../database/client'
+import { expenseParticipants, expenses } from '../../../database/schema'
+
+export default defineEventHandler(async (event) => {
+  const slug = getRouterParam(event, 'slug')!
+  await getPotOrThrow(slug)
+
+  const body = await readBody(event)
+  const description = typeof body?.description === 'string' ? body.description.trim() : ''
+  const amountCents = Number(body?.amountCents)
+  const payerId = Number(body?.payerId)
+  const participantIds: number[] = Array.isArray(body?.participantIds) ? body.participantIds.map(Number) : []
+
+  if (!description) {
+    throw createError({ statusCode: 400, statusMessage: 'description is required' })
+  }
+  if (!Number.isInteger(amountCents) || amountCents <= 0) {
+    throw createError({ statusCode: 400, statusMessage: 'amountCents must be a positive integer' })
+  }
+  if (participantIds.length === 0) {
+    throw createError({ statusCode: 400, statusMessage: 'at least one participant must be selected' })
+  }
+
+  const potParticipants = await getParticipants(slug)
+  const validIds = new Set(potParticipants.map(p => p.id))
+  if (!validIds.has(payerId) || participantIds.some(id => !validIds.has(id))) {
+    throw createError({ statusCode: 400, statusMessage: 'payerId and participantIds must reference participants of this Pot' })
+  }
+
+  const db = useDb()
+  const [expense] = await db.insert(expenses).values({ potSlug: slug, description, amountCents, payerId }).returning()
+  await db.insert(expenseParticipants).values(participantIds.map(participantId => ({ expenseId: expense.id, participantId })))
+
+  return { ...expense, participantIds }
+})

server/api/pots/[slug]/expenses/[id].delete.ts

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+import { and, eq } from 'drizzle-orm'
+import { useDb } from '../../../../database/client'
+import { expenseParticipants, expenses } from '../../../../database/schema'
+
+export default defineEventHandler(async (event) => {
+  const slug = getRouterParam(event, 'slug')!
+  const id = Number(getRouterParam(event, 'id'))
+  await getPotOrThrow(slug)
+
+  const db = useDb()
+  const [existing] = await db.select().from(expenses).where(and(eq(expenses.id, id), eq(expenses.potSlug, slug)))
+  if (!existing) {
+    throw createError({ statusCode: 404, statusMessage: 'Expense not found' })
+  }
+
+  await db.delete(expenseParticipants).where(eq(expenseParticipants.expenseId, id))
+  await db.delete(expenses).where(eq(expenses.id, id))
+
+  return { success: true }
+})

server/api/pots/[slug]/expenses/[id].patch.ts

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+import { and, eq } from 'drizzle-orm'
+import { useDb } from '../../../../database/client'
+import { expenseParticipants, expenses } from '../../../../database/schema'
+
+export default defineEventHandler(async (event) => {
+  const slug = getRouterParam(event, 'slug')!
+  const id = Number(getRouterParam(event, 'id'))
+  await getPotOrThrow(slug)
+
+  const body = await readBody(event)
+  const description = typeof body?.description === 'string' ? body.description.trim() : ''
+  const amountCents = Number(body?.amountCents)
+  const payerId = Number(body?.payerId)
+  const participantIds: number[] = Array.isArray(body?.participantIds) ? body.participantIds.map(Number) : []
+
+  if (!description) {
+    throw createError({ statusCode: 400, statusMessage: 'description is required' })
+  }
+  if (!Number.isInteger(amountCents) || amountCents <= 0) {
+    throw createError({ statusCode: 400, statusMessage: 'amountCents must be a positive integer' })
+  }
+  if (participantIds.length === 0) {
+    throw createError({ statusCode: 400, statusMessage: 'at least one participant must be selected' })
+  }
+
+  const potParticipants = await getParticipants(slug)
+  const validIds = new Set(potParticipants.map(p => p.id))
+  if (!validIds.has(payerId) || participantIds.some(pid => !validIds.has(pid))) {
+    throw createError({ statusCode: 400, statusMessage: 'payerId and participantIds must reference participants of this Pot' })
+  }
+
+  const db = useDb()
+  const [existing] = await db.select().from(expenses).where(and(eq(expenses.id, id), eq(expenses.potSlug, slug)))
+  if (!existing) {
+    throw createError({ statusCode: 404, statusMessage: 'Expense not found' })
+  }
+
+  await db.update(expenses).set({ description, amountCents, payerId }).where(eq(expenses.id, id))
+  await db.delete(expenseParticipants).where(eq(expenseParticipants.expenseId, id))
+  await db.insert(expenseParticipants).values(participantIds.map(participantId => ({ expenseId: id, participantId })))
+
+  return { id, description, amountCents, payerId, participantIds }
+})

server/api/pots/[slug]/participants.post.ts

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+import { useDb } from '../../../database/client'
+import { participants } from '../../../database/schema'
+
+export default defineEventHandler(async (event) => {
+  const slug = getRouterParam(event, 'slug')!
+  await getPotOrThrow(slug)
+
+  const body = await readBody(event)
+  const name = typeof body?.name === 'string' ? body.name.trim() : ''
+  if (!name) {
+    throw createError({ statusCode: 400, statusMessage: 'name is required' })
+  }
+
+  const db = useDb()
+  const [participant] = await db.insert(participants).values({ potSlug: slug, name }).returning()
+  return participant
+})

server/api/pots/[slug]/participants/[id].patch.ts

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+import { and, eq } from 'drizzle-orm'
+import { isValidPaymentLink } from '../../../../../shared/utils/paymentLink'
+import { useDb } from '../../../../database/client'
+import { participants } from '../../../../database/schema'
+
+export default defineEventHandler(async (event) => {
+  const slug = getRouterParam(event, 'slug')!
+  const id = Number(getRouterParam(event, 'id'))
+  await getPotOrThrow(slug)
+
+  const body = await readBody(event)
+  const paymentLink = typeof body?.paymentLink === 'string' ? body.paymentLink.trim() : ''
+  if (paymentLink && !isValidPaymentLink(paymentLink)) {
+    throw createError({ statusCode: 400, statusMessage: 'paymentLink must be a valid http(s) URL' })
+  }
+
+  const db = useDb()
+  const [existing] = await db.select().from(participants).where(and(eq(participants.id, id), eq(participants.potSlug, slug)))
+  if (!existing) {
+    throw createError({ statusCode: 404, statusMessage: 'Participant not found' })
+  }
+
+  const [updated] = await db.update(participants)
+    .set({ paymentLink: paymentLink || null })
+    .where(eq(participants.id, id))
+    .returning()
+
+  return updated
+})

server/api/pots/[slug]/payments.post.ts

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+import { useDb } from '../../../database/client'
+import { expenseParticipants, expenses } from '../../../database/schema'
+
+export default defineEventHandler(async (event) => {
+  const slug = getRouterParam(event, 'slug')!
+  await getPotOrThrow(slug)
+
+  const body = await readBody(event)
+  const fromId = Number(body?.fromId)
+  const toId = Number(body?.toId)
+  const amountCents = Number(body?.amountCents)
+
+  if (!Number.isInteger(amountCents) || amountCents <= 0) {
+    throw createError({ statusCode: 400, statusMessage: 'amountCents must be a positive integer' })
+  }
+  if (fromId === toId) {
+    throw createError({ statusCode: 400, statusMessage: 'fromId and toId must differ' })
+  }
+
+  const potParticipants = await getParticipants(slug)
+  const validIds = new Set(potParticipants.map(p => p.id))
+  if (!validIds.has(fromId) || !validIds.has(toId)) {
+    throw createError({ statusCode: 400, statusMessage: 'fromId and toId must reference participants of this Pot' })
+  }
+
+  const db = useDb()
+  const [payment] = await db.insert(expenses)
+    .values({ potSlug: slug, type: 'payment', description: 'Settlement', amountCents, payerId: fromId })
+    .returning()
+  await db.insert(expenseParticipants).values({ expenseId: payment.id, participantId: toId })
+
+  return { ...payment, participantIds: [toId] }
+})