48 lines
1.8 KiB
Elixir
48 lines
1.8 KiB
Elixir
defmodule Parser.Weather do
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@moduledoc """
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APRS weather report parsing.
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"""
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@doc """
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Parse an APRS weather report string. Returns a struct or error.
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"""
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@spec parse(String.t()) :: map() | nil
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def parse("_" <> <<timestamp::binary-size(8), rest::binary>>) do
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weather_data = parse_weather_data(rest)
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Map.merge(%{timestamp: timestamp, data_type: :weather}, weather_data)
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end
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def parse(data) do
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weather_data = parse_weather_data(data)
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Map.merge(%{data_type: :weather}, weather_data)
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end
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@doc """
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Parses a weather data string into a map of weather values.
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"""
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@spec parse_weather_data(String.t()) :: map()
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def parse_weather_data(weather_data) do
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timestamp = Parser.Helpers.extract_timestamp(weather_data)
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weather_data = Parser.Helpers.remove_timestamp(weather_data)
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weather_values = %{
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wind_direction: Parser.Helpers.parse_wind_direction(weather_data),
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wind_speed: Parser.Helpers.parse_wind_speed(weather_data),
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wind_gust: Parser.Helpers.parse_wind_gust(weather_data),
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temperature: Parser.Helpers.parse_temperature(weather_data),
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rain_1h: Parser.Helpers.parse_rainfall_1h(weather_data),
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rain_24h: Parser.Helpers.parse_rainfall_24h(weather_data),
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rain_since_midnight: Parser.Helpers.parse_rainfall_since_midnight(weather_data),
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humidity: Parser.Helpers.parse_humidity(weather_data),
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pressure: Parser.Helpers.parse_pressure(weather_data),
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luminosity: Parser.Helpers.parse_luminosity(weather_data),
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snow: Parser.Helpers.parse_snow(weather_data)
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}
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result = %{timestamp: timestamp, data_type: :weather, raw_weather_data: weather_data}
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Enum.reduce(weather_values, result, fn {key, value}, acc ->
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if is_nil(value), do: acc, else: Map.put(acc, key, value)
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end)
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end
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end
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