# Time weighted corrosion rate calculation

The objective of this calculation is to derive a final representative corrosion depth growth
rate (mm/year) at each point along a pipeline using multiple In-Line Inspection (ILI) data sets,
and to predict the likely depth of metal loss by a future target date (e.g. 24 October 2023)

## Input

### Arguments

- `org_id`: as string which should be a valid `uuid` for the organization
- `project_id`: the id of the data project where the pipeline data is found
- `pipeline_id`: an `array` of `strings` which should each be a valid uuid representing a pipeline.
- `target_date`: a `string` representing the date for which the corrosion growth rate should be predicted.

## Creating the function on the platform

To create this function on the platform using the `cli` set up the port forwarding as shown in README.

Then run the following command to create the function.

```bash
cargo run functions create \
  -f functions/acr_time_weighted \
  -d "Run the time weighted corrosion rate calculation" \
  -i org_id=string \
  -i project_id=string \
  -i target_date=string \
  -i pipeline_id=array
```

## Testing the function locally

You can run and test the function locally by running

```bash
cargo run
```

Then you can check it work with `curl` as follows

```bash
curl localhost:8080 -d $(jq '. | tojson' functions/acr_time_weighted/example_input.json)
```