# Pipeline route calculation

A function that exposes the pipeline route calculations.

The pipeline route can be defined by various means
- `kml` route file
- `kmz` route file
- `csv` of the x,y, and optionally z coordinates of the pipeline.

If the elevation is missing, we utilise one of the following services to obtain
the elevation of each waypoint on the pipeline.

- Google maps
- Map box
- Open elevation

This function implements the calculation of this following part of the BPML:

```mermaid
flowchart LR
    Start((Start))
    Start --> KML{User upload .kml or .csv?}
    KML -->|.kml| V("Calculate pipeline measures (Vincenty's Method) - Calculation #2")
    KML -->|.csv| POS{Is position in UTM or Lat/Lon?}
    POS -->|UTM| PROJ(Poject to Lat/Lon - Calculation #3)
    PROJ --> MEAS
    POS -->|Lat/Lon| MEAS{Does the file contain the measure?}
    MEAS -->|no| V
    MEAS -->|yes| Done
    V --> Done((Done))
```

## 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
- `elevation_provider`: a `string` value should be one of the following types
  - `mapbox`
  - `google_maps`
  - `open_elevation`
- `pipeline_id`: an `array` of `strings` which should each be a valid uuid representing a pipeline.
- `route_file`: an `array` of `objects` containing the details of the uploaded file.

Note the pipeline_id array and route_file array should be the length such that
the first entry in each array corresponds to one another.

## 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/pipeline_route \
  -d "Processes a pipeline route KML/KMZ/CSV file and creates the pipeline route sequence" \
  -o pipeline_id=array \
  -o project_id=string \
  -o org_id=string \
  -i org_id=string \
  -i project_id=string \
  -i elevation_provider=string \
  -i pipeline_id=array \
  -i route_file=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/pipeline_route/example_input.json)
```