$partyMapping = @{
    ARD   = 'Blue'
    ZDF   = 'Orange'
    'C&A' = 'Red'
}

# nested array instead of hashtable, because hashtable keys are case-insensitive
$replacementList = @(
    ,('strasse','straße')
    ,('Strasse','Straße')
    ,('Albrecht-von-Bernegger-S','Albrecht-von-Bernegger-Straße')
    ,('Geschwister-Scholl-Str.','Geschwister-Scholl-Straße')
    ,('Albert-Schweitzer-Str.','Albert-Schweitzer-Straße')
    ,('Freiherr-V-Stein-Str','Freiherr-vom-Stein-Straße')
    ,('Nussbaumweg','Nußbaumweg')
    ,('Elstarweg ','Elstarweg')
)

$featureList = Import-Csv ./data.csv
| Sort-Object -Unique Strassenname
| Group-Object {$_.Wahllokal1,$_.Wahllokal2,$_.Wahllokal3 -join ' '}
| ForEach-Object {
    $pollingStation = $_

    $party = ('ARD','ZDF','C&A' | Get-Random)

    $pollingStation.Group | ForEach-Object {
        $street = $_.Strassenname
        foreach ($replacement in $replacementList) {
            $street = $street.Replace($replacement[0], $replacement[1])
        }

        $query = '
<osm-script>
  <query into="_" type="area">
    <has-kv k="name" modv="" v="Öhringen"/>
  </query>
  <query into="_" type="way">
    <has-kv k="name" modv="" v="{0}"/>
    <area-query/>
  </query>
  <union into="_">
    <item from="_" into="_"/>
    <recurse type="way-node"/>
  </union>
  <print e="" from="_" geometry="skeleton" ids="yes" limit="" mode="body" n="" order="id" s="" w=""/>
</osm-script>' -f $street

        $overpassSplat = @{
            Method = 'Post'
            Uri = 'https://overpass-api.de/api/interpreter'
            Body = $query
        }
        $overpassResult = Invoke-RestMethod @overpassSplat

        if (!$overpassResult.osm.way.nd) {
            Write-Error ('way "{0}" for polling station "{1}" probably not found' -f $street,$pollingStation.name)
            return
        }

        $overpassResult.osm.way | ForEach-Object {
            $coordinateList = $_.nd.ref | ForEach-Object {
                $overpassResult.osm.node
                | Where-Object id -eq $_
                | ForEach-Object{
                    ,($_.lon,$_.lat)
                }
            }

            [PSCustomObject]@{
                type = 'Feature'
                properties = [PSCustomObject]@{
                    _umap_options = [PSCustomObject]@{
                        #color = ($using:partyMapping).$party
                        color = $partyMapping.$party
                        weight = 10
                    }
                    name = $street
                    description = $pollingStation.Name
                }
                geometry = [PSCustomObject]@{
                    type = 'LineString'
                    coordinates = $coordinateList
                }
            }
        }
    }
}

$output = [PSCustomObject]@{
    type = 'FeatureCollection'
    features = $featureList
}

$output | ConvertTo-Json -Depth 99 | Out-File output.geojson