Part browsing

api/src/graphql/parts.sdl.ts

@@ -8,7 +8,29 @@ export const schema = gql`
     createdAt: DateTime!
   }
 
+  type PartPage {
+    parts: [Part!]!
+    count: Int!
+    page: Int!
+    sort: SortMethod!
+    order: SortOrder!
+  }
+
+  enum SortMethod {
+    id
+    name
+    description
+    stock
+    createdAt
+  }
+
+  enum SortOrder {
+    ascending
+    descending
+  }
+
   type Query {
+    partPage(page: Int, sort: SortMethod, order: SortOrder): PartPage @skipAuth
     parts: [Part!]! @skipAuth
     part(id: Int!): Part @skipAuth
   }

api/src/services/parts/parts.ts

@@ -1,8 +1,18 @@
 import * as Filestack from 'filestack-js'
-import type { QueryResolvers, MutationResolvers } from 'types/graphql'
+import type {
+  QueryResolvers,
+  MutationResolvers,
+  SortMethod,
+  SortOrder,
+} from 'types/graphql'
 
 import { db } from 'src/lib/db'
 
+const PARTS_PER_PAGE = 8
+
+const removeEnding = (input: string): string =>
+  input.endsWith('ending') ? input.slice(0, -6) : input
+
 export const parts: QueryResolvers['parts'] = () => {
   return db.part.findMany()
 }
@@ -13,6 +23,59 @@ export const part: QueryResolvers['part'] = ({ id }) => {
   })
 }
 
+export const partPage = ({
+  page = 1,
+  sort = 'id',
+  order = 'ascending',
+}: {
+  page: number
+  sort: SortMethod
+  order: SortOrder
+}) => {
+  const offset = (page - 1) * PARTS_PER_PAGE
+  let orderByCase
+
+  switch (sort) {
+    case 'id':
+      orderByCase = { id: removeEnding(order) }
+      break
+
+    case 'name':
+      orderByCase = { name: removeEnding(order) }
+      break
+
+    case 'createdAt':
+      orderByCase = { createdAt: removeEnding(order) }
+      break
+
+    case 'description':
+      orderByCase = { description: removeEnding(order) }
+      break
+
+    case 'stock':
+      orderByCase = {
+        availableStock: removeEnding(order),
+      }
+      break
+
+    default:
+      orderByCase = { id: removeEnding(order) }
+      break
+  }
+
+  return {
+    parts: db.part.findMany({
+      take: PARTS_PER_PAGE,
+      skip: offset,
+      orderBy: orderByCase,
+    }),
+    count: db.part.count(),
+    page,
+    sort,
+    order,
+  }
+}
+
 export const createPart: MutationResolvers['createPart'] = ({ input }) => {
   return db.part.create({
     data: input,