module CartoGrass

# File lib/cartograss.rb, line 24
def carto_export(user:, api_key:, input:, dataset:, overwrite: false)
  if epsg4326?
    carto_export_4326 user: user, api_key: api_key, input: input, dataset: dataset, overwrite: overwrite
  else
    projected = self
    GrassGis.session(configuration.merge(CARTO_TMP_4326)) do
      v.proj(
        '--overwrite',
        location: projected.configuration[:location],
        mapset:   projected.configuration[:mapset],
        input:    input
      )
      extend CartoGrass
      carto_export_4326 user: user, api_key: api_key, input: input, dataset: dataset, overwrite: true
    end

    # GrassGis.session(configuration.merge(CARTO_TMP_4326)) do |carto_tmp|
    #   carto_tmp.v.proj(
    #     '--overwrite',
    #     location: configuration[:location],
    #     mapset:   configuration[:mapset],
    #     input:    input
    #   )
    #   carto_tmp.extend CartoGrass
    #   carto_tmp.send :carto_export_4326, user: user, api_key: api_key, input: input, dataset: dataset, overwrite: overwrite
    # end
  end
end

# File lib/cartograss.rb, line 4
def carto_import(user:, dataset:, api_key: nil)
  with_api_key api_key do
    if epsg4326?
      v.in.ogr(
        '-o',
        input: "#{CARTO_OGR}:#{user} tables=#{dataset}",
        layer: dataset,
        output: dataset
      )
    else
      v.import(
        input: "#{CARTO_OGR}:#{user} tables=#{dataset}",
        layer: dataset,
        output: dataset,
        epsg: 4326
      )
    end
  end
end

# File lib/cartograss.rb, line 86
def carto_export_4326(user:, api_key:, input:, dataset:, overwrite: false)
  with_api_key api_key do
    if overwrite
      v.out.ogr(
        '--overwrite',
        format: CARTO_OGR,
        input: input,
        output: "#{CARTO_OGR}:#{user} tables=#{dataset}",
        output_layer: dataset
      )
    else
      # first create layer to avoid problem reading all layers
      v.out.ogr(
        '-n',
        format: CARTO_OGR,
        input: input,
        output: "#{CARTO_OGR}:#{user}",
        output_layer: dataset
      )
      # now overwrite it:
      v.out.ogr(
        '--overwrite',
        format: CARTO_OGR,
        input: input,
        output: "#{CARTO_OGR}:#{user} tables=#{dataset}",
        output_layer: dataset
      )
    end
  end
end

# File lib/cartograss.rb, line 65
def epsg4326?
  g.proj '-g'
  proj = shell_to_hash
  proj['epsg'] == '4326' ||
  proj['ellps'] == 'wgs84' && proj['proj'] == 'll' && proj['unit'] == 'degrees'
end

# File lib/cartograss.rb, line 72
def with_api_key(api_key)
  if api_key
    api_key_var = "#{CARTO_OGR.upcase}_API_KEY"
    begin
      ENV[api_key_var] = api_key
      yield
    ensure
      ENV.delete api_key_var
    end
  else
    yield
  end
end