feat(customer): manage default address selection (#6295)

**What**
- Catches unique constraints on customer_id, is_default_billing/is_default_shipping and reformats
- Adds an step to create and update of addresses that unsets the previous default shipping/billing address if necessary.
  - This creates a behavior in the API where you can always set an address to be default and it will automatically unset the previous one for you.

integration-tests/plugins/__tests__/customer/admin/create-customer-addresses.ts

@@ -80,4 +80,76 @@ describe("POST /admin/customers/:id/addresses", () => {
 
     expect(customerWithAddresses.addresses?.length).toEqual(1)
   })
+
+  it("sets new shipping address as default and unsets the old one", async () => {
+    const customer = await customerModuleService.create({
+      first_name: "John",
+      last_name: "Doe",
+      addresses: [
+        {
+          first_name: "John",
+          last_name: "Doe",
+          address_1: "Test street 1",
+          is_default_shipping: true,
+        },
+      ],
+    })
+
+    const api = useApi() as any
+    const response = await api.post(
+      `/admin/customers/${customer.id}/addresses`,
+      {
+        first_name: "John",
+        last_name: "Doe",
+        address_1: "Test street 2",
+        is_default_shipping: true,
+      },
+      adminHeaders
+    )
+
+    expect(response.status).toEqual(200)
+
+    const [address] = await customerModuleService.listAddresses({
+      customer_id: customer.id,
+      is_default_shipping: true,
+    })
+
+    expect(address.address_1).toEqual("Test street 2")
+  })
+
+  it("sets new billing address as default and unsets the old one", async () => {
+    const customer = await customerModuleService.create({
+      first_name: "John",
+      last_name: "Doe",
+      addresses: [
+        {
+          first_name: "John",
+          last_name: "Doe",
+          address_1: "Test street 1",
+          is_default_billing: true,
+        },
+      ],
+    })
+
+    const api = useApi() as any
+    const response = await api.post(
+      `/admin/customers/${customer.id}/addresses`,
+      {
+        first_name: "John",
+        last_name: "Doe",
+        address_1: "Test street 2",
+        is_default_billing: true,
+      },
+      adminHeaders
+    )
+
+    expect(response.status).toEqual(200)
+
+    const [address] = await customerModuleService.listAddresses({
+      customer_id: customer.id,
+      is_default_billing: true,
+    })
+
+    expect(address.address_1).toEqual("Test street 2")
+  })
 })

integration-tests/plugins/__tests__/customer/admin/update-customer-address.spec.ts

@@ -76,4 +76,89 @@ describe("POST /admin/customers/:id/addresses/:address_id", () => {
       })
     )
   })
+
+  it("updates a new address to be default and unsets old one", async () => {
+    const customer = await customerModuleService.create({
+      first_name: "John",
+      last_name: "Doe",
+    })
+    const [, address] = await customerModuleService.addAddresses([
+      {
+        customer_id: customer.id,
+        first_name: "John",
+        last_name: "Doe",
+        address_1: "Test street 1",
+        is_default_shipping: true,
+      },
+      {
+        customer_id: customer.id,
+        first_name: "John",
+        last_name: "Doe",
+        address_1: "Test street 2",
+      },
+    ])
+
+    const api = useApi() as any
+    const response = await api.post(
+      `/admin/customers/${customer.id}/addresses/${address.id}`,
+      {
+        first_name: "jane",
+        is_default_shipping: true,
+      },
+      adminHeaders
+    )
+
+    expect(response.status).toEqual(200)
+
+    const [defaultAddress] = await customerModuleService.listAddresses({
+      customer_id: customer.id,
+      is_default_shipping: true,
+    })
+
+    expect(defaultAddress.first_name).toEqual("jane")
+    expect(defaultAddress.address_1).toEqual("Test street 2")
+  })
+
+  // do the same as above but for billing address
+  it("updates a new address to be default and unsets old one", async () => {
+    const customer = await customerModuleService.create({
+      first_name: "John",
+      last_name: "Doe",
+    })
+    const [, address] = await customerModuleService.addAddresses([
+      {
+        customer_id: customer.id,
+        first_name: "John",
+        last_name: "Doe",
+        address_1: "Test street 1",
+        is_default_billing: true,
+      },
+      {
+        customer_id: customer.id,
+        first_name: "John",
+        last_name: "Doe",
+        address_1: "Test street 2",
+      },
+    ])
+
+    const api = useApi() as any
+    const response = await api.post(
+      `/admin/customers/${customer.id}/addresses/${address.id}`,
+      {
+        first_name: "jane",
+        is_default_billing: true,
+      },
+      adminHeaders
+    )
+
+    expect(response.status).toEqual(200)
+
+    const [defaultAddress] = await customerModuleService.listAddresses({
+      customer_id: customer.id,
+      is_default_billing: true,
+    })
+
+    expect(defaultAddress.first_name).toEqual("jane")
+    expect(defaultAddress.address_1).toEqual("Test street 2")
+  })
 })