git init

app/lib/actions.ts

@@ -0,0 +1,144 @@
+'use server';
+
+import { z } from 'zod';
+import {sql} from '@vercel/postgres';
+import { revalidatePath } from 'next/cache';
+import { redirect } from 'next/navigation'
+import {signIn} from "@/auth";
+import {AuthError} from "next-auth";
+
+const FormSchema = z.object({
+    id: z.string(),
+    customerId: z.string({
+        invalid_type_error: 'Please select a customer.'
+    }),
+    amount: z.coerce
+        .number()
+        .gt(0, {message: 'Please enter an amount greater than $0.'})
+    ,
+    status: z.enum(['pending', 'paid'], {
+        invalid_type_error: 'Please select an invoice status.'
+    }),
+    date: z.string(),
+});
+
+export type State = {
+    errors?: {
+        customerId?: string[];
+        amount?: string[];
+        status?: string[];
+    };
+    message?: string | null;
+};
+
+export async function createInvoice(prevState: State, formData: FormData) {
+    const validatedFields = CreateInvoice.safeParse({
+        customerId: formData.get('customerId'),
+        amount: formData.get('amount'),
+        status: formData.get('status')
+    });
+
+    // If form validation fails, return errors early. Otherwise, continue.
+    if (!validatedFields.success) {
+        return {
+            errors: validatedFields.error.flatten().fieldErrors,
+            message: 'Missing Fields. Failed to Create Invoice.',
+        };
+    }
+
+    const { customerId, amount, status } = validatedFields.data;
+    const amountInCents = amount * 100;
+    const date = new Date().toISOString().split('t')[0];
+
+    try {
+        await sql`
+            INSERT INTO invoices (customer_id, amount, status, date)
+            VALUES (${customerId}, ${amountInCents}, ${status}, ${date})
+        `;
+    } catch {
+        return {
+            message: 'Database Error: Failed to create invoice.'
+        }
+    }
+
+    revalidatePath('/dashboard/invoices');
+    redirect('/dashboard/invoices');}
+
+const CreateInvoice = FormSchema.omit({ id: true, date: true });
+
+// Use Zod to update the expected types
+const UpdateInvoice = FormSchema.omit({ id: true, date: true });
+
+// ...
+
+export async function updateInvoice(
+    id: string,
+    prevState: State,
+    formData: FormData,
+) {
+
+    const validatedFields = UpdateInvoice.safeParse({
+        customerId: formData.get('customerId'),
+        amount: formData.get('amount'),
+        status: formData.get('status'),
+    });
+
+    if (!validatedFields.success) {
+        return {
+            errors: validatedFields.error.flatten().fieldErrors,
+            message: 'Missing Fields. Failed to Update Invoice.',
+        }
+    }
+
+    const { customerId, amount, status } = validatedFields.data;
+    const amountInCents = amount * 100;
+
+    try {
+        await sql`
+            UPDATE invoices
+            SET customer_id = ${customerId}, amount = ${amountInCents}, status = ${status}
+            WHERE id = ${id}
+          `;
+    } catch {
+       return {
+           message: 'Database Error: Failed to update invoice.'
+       }
+    }
+
+    revalidatePath('/dashboard/invoices');
+    redirect('/dashboard/invoices');
+}
+
+export async function deleteInvoice(
+    id: string,
+) {
+    try {
+        await sql`DELETE FROM invoices WHERE id = ${id}`;
+        revalidatePath('/dashboard/invoices');
+        return {message: 'Deleted Invoice.'}
+    } catch {
+        return {
+            errors: {},
+            message: 'Database Error: Failed to Delete invoice.'
+        }
+    }
+}
+
+export async function authenticate(
+    prevState: string | undefined,
+    formData: FormData,
+) {
+    try {
+        await signIn('credentials', formData);
+    } catch (error) {
+        if (error instanceof AuthError) {
+            switch (error.type) {
+                case 'CredentialsSignin':
+                    return 'Invalid credentials.';
+                default:
+                    return 'Something went wrong.';
+            }
+        }
+        throw error;
+    }
+}