# Serverless Functions

Backend for the mobile application.

## How it works

By adding a file in the `api` folder, it will create an endpoint of the name of the file.
For instance, the file `directions-wrapper.ts` is linked to the endpoint `/api/directions-wrapper`.
When targeting the endpoint, the function defined in the related file will be executed.

To have a small example of a serveless function, check out [`directions-wrapper.ts`](./api/directions-wrapper.ts)

If you need to use secrets, define them as environment variables on the [vercel site](https://vercel.com/teamprojectlodz-gmailcom/physigo/settings/environment-variables).

You have to run `npm i` each time the `package.json` is modified to install the new dependencies.
It also includes each time you pull changes from others.

## Login to Vercel

1. Run `npx vercel login`
2. Choose Email auth
3. Email: teamprojectlodz@gmail.com
4. Password: see teams

## Test the functions

To locally test the functions, run `npx vercel dev`.
It will start a local server that you can target for your tests.

## Deploy new functions

Once authenticated, run `npx vercel --prod`

### Deploy for the first time

For the first time, you have to link to the existing project.
1. For `Set up and deploy ...`, answer `y` (default answer)
2. For the scope, answer `teamprojectlodz-gmailcom` (default answer)
3. For `Link to existing project`, answer `y`
4. For the name of the existing project, answer `physigo`

It will generate a `.vercel` folder, which links to the project on vercel.