schema {
    query: RootSchemaQuery
}
directive @filter(
    """Name of the filter operation to perform."""
    op: String!
    """List of string operands for the operator."""
    value: [String!]
) repeatable on FIELD | INLINE_FRAGMENT
directive @tag(
    """Name to apply to the given property field."""
    name: String
) on FIELD
directive @output(
    """What to designate the output field generated from this property field."""
    name: String
) on FIELD
directive @optional on FIELD
directive @recurse(
    """
    Recurse up to this many times on this edge. A depth of 1 produces the current
    vertex and its immediate neighbors along the given edge.
    """
    depth: Int!
) on FIELD
directive @fold on FIELD
directive @transform(
    """
    Name of the transformation operation to perform.
    """
    op: String!
) on FIELD

type RootSchemaQuery {
    MetarReport: [MetarReport]
    LatestMetarReportForAirport(airport_code: String!): MetarReport
}

type MetarReport {
    station_id: String!               # for airport stations, the 4-letter ICAO airport code: KBOS for Boston Logan
    raw_report: String!

    latitude: Float
    longitude: Float

    wind_speed_kts: Int               # in knots
    wind_direction: Int               # in degrees, if known
    wind_direction_variable: Boolean  # true if the wind direction is inconsistent
    wind_gusts_kts: Int               # in knots

    temperature: Float                # in degrees C
    dewpoint: Float                   # in degrees C

    visibility_unlimited: Boolean     # corresponds to visibility 9999
    visibility_minimal: Boolean       # corresponds to visibility 0000
    visibility_statute_mi: Float      # in statute miles (the "usual" miles, not nautical miles)

    altimeter_in_hg: Float            # in inches of mercury
    sea_level_pressure_mb: Float      # in milibars

    cloud_cover: [MetarCloudCover!]
}

type MetarCloudCover {
    sky_cover: String!               # standard codes: SKC, CLR, FEW, SCT, BKN, OVC
    base_altitude: Int               # in feet above ground level (ft AGL)
}