service layer WIP

src/lib/prisma/client.ts

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+import {PrismaClient} from "@prisma/client";
+
+const globalForPrisma = global as unknown as { prisma: PrismaClient | undefined };
+
+export const prisma =
+    globalForPrisma.prisma ||
+    new PrismaClient({
+        log: ["query", "info", "warn", "error"],
+    });
+
+if (process.env.NODE_ENV !== "production") {
+    globalForPrisma.prisma = prisma;
+}

src/lib/services/beliSawitService.ts

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+import {prisma} from '@/lib/prisma/client';
+import {Pembelian} from "@prisma/client";
+
+export const BeliSawitService = {
+    createPembelian: (beli: Pembelian) => {
+        return prisma.pembelian.create({
+            data: {
+                ...beli,
+                createdAt: new Date(),
+            },
+        })
+    },
+
+    getPembelianById: (id: number) => {
+        return prisma.pembelian.findUnique({
+            where: {
+                id: id,
+            },
+        })
+    },
+
+    pembelianExist : (id: number) : boolean => {
+        const pembelian = prisma.pembelian.findFirst({
+            where: {
+                id: id,
+            },
+        })
+
+        return pembelian !== null
+    }
+
+}

src/lib/services/hargaService.ts

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+import {prisma} from '@/lib/prisma/client';
+import {HargaBeli} from "@prisma/client";
+
+export const HargaBeliService = {
+
+    // get harga beli. Pass null buat dapatein harga hari ini
+    getHargaBeli: (tanggal: Date) => {
+        return prisma.hargaBeli.findFirst({
+            where: {
+                tanggal: {
+                    equals: new Date(tanggal.setHours(0,0,0))
+                        || new Date().setHours(0, 0, 0, 0),
+                },
+            },
+        })
+    },
+
+    create : (harga: HargaBeli)=>{
+        return prisma.hargaBeli.create({
+            data: {
+                ...harga,
+                createdAt: new Date(),
+            },
+        })
+    }
+
+}

src/lib/services/petaniService.ts

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+import {prisma} from '@/lib/prisma/client';
+import {Petani} from "@prisma/client";
+
+export const PetaniService = {
+    create: (petani: Petani) => {
+        return prisma.petani.create({
+            data: {
+                ...petani,
+                createdAt: new Date(),
+            },
+        })
+    },
+
+    edit: (petani: Petani) => {
+        return prisma.petani.update({
+            where: {
+                id: petani.id,
+            },
+            data: {
+                ...petani,
+                updatedAt: new Date(),
+            },
+        })
+    },
+
+    getPetaniById: (id: number) => {
+        return prisma.petani.findUnique({
+            where: {
+                id: id,
+            },
+        })
+    },
+}

src/lib/services/timbangSawitService.ts

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+import {BeliSawitService} from '@/lib/services/beliSawitService';
+import {TimbangService} from '@/lib/services/timbanganService';
+import {Timbang} from "@prisma/client";
+
+
+export const TimbangSawitService = {
+
+    timbangSawit : async (timbangan: Timbang) => {
+        // check if pembelian exist
+        if (!BeliSawitService.getPembelianById(timbangan.id)) {
+            throw new Error('Pembelian tidak ditemukan')
+        }
+
+        const listOfTimbang = await TimbangService.listTimbangByPembelianId(timbangan.pembelian_id);
+        listOfTimbang.push(timbangan);
+
+        // check untuk negative selisih timbangan
+        listOfTimbang.map((row : Timbang, i: number) =>{
+            const beratSekarang = row.berat;
+            const beratSelanjutnya = i+1 < listOfTimbang.length ? listOfTimbang[i+1].berat : 0;
+            const selisih = beratSekarang - beratSelanjutnya;
+
+            if (selisih<0){
+                throw new Error('Timbangan melebihi berat timbangan sebelumnya')
+            }
+        })
+
+        // all good, create new timbang
+        return  TimbangService.create(timbangan);
+    },
+}

src/lib/services/timbanganService.ts

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+import {BeliSawitService} from '@/lib/services/beliSawitService';
+import {prisma} from '@/lib/prisma/client';
+import {Timbang} from "@prisma/client";
+
+export const TimbangService = {
+    create: (timbang: Timbang) => {
+        if (!BeliSawitService.pembelianExist(timbang.pembelian_id)){
+            throw new Error('Pembelian tidak ditemukan')
+        }
+
+        return prisma.timbang.create({
+            data: {
+                ...timbang,
+                createdAt: new Date(),
+            },
+        })
+    },
+
+    edit: (timbang: Timbang) => {
+        return prisma.timbang.update({
+            where: {
+                id: timbang.id,
+            },
+            data: {
+                ...timbang,
+                updatedAt: new Date(),
+            },
+        })
+    },
+
+    // get list timbang by pembelian id
+    listTimbangByPembelianId: (id: number) => {
+        return prisma.timbang.findMany({
+            where: {
+                pembelian_id: id,
+            },
+            orderBy: {
+                waktu: "asc",
+            },
+        })
+    },
+}