1006fdaefc
- Delete dead config keys and test file (typo'd aprsme_is_*, vacuous disable test) - Remove duplicate function clauses and identical function pairs - Rename misleading one_hour_ago variable to one_day_ago - Strip stale Oban comment - Remove TestHelpers time function duplicates - Inline Aprsme.Schema module (only 1 caller) - Deduplicate prod esbuild config - Thin SymbolRenderer delegations, inline TimeUtils wrappers - Remove redundant DeploymentNotifier GenServer polling - Replace random fallback in get_callsign_key with sentinel
93 lines
2.9 KiB
Elixir
93 lines
2.9 KiB
Elixir
defmodule AprsmeWeb.WeatherUnits do
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@moduledoc """
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Handles weather unit conversions and formatting based on locale.
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Supports imperial (US) and metric (international) units.
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"""
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alias Aprsme.Convert
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@doc """
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Determines the unit system based on locale.
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Returns :imperial for US, :metric for most other countries.
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"""
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@spec unit_system(String.t() | nil | any()) :: :imperial | :metric
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def unit_system("en"), do: :imperial
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def unit_system("es"), do: :metric
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def unit_system("de"), do: :metric
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def unit_system("fr"), do: :metric
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def unit_system(locale) when is_binary(locale), do: :metric
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def unit_system(nil), do: :imperial
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def unit_system(_), do: :imperial
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@doc """
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Converts temperature from Fahrenheit to Celsius if needed.
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Returns the temperature in the appropriate unit for the locale.
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"""
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@spec format_temperature(number() | any(), String.t()) :: {number() | any(), String.t()}
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def format_temperature(temp, locale) when is_number(temp),
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do: format_by_unit(temp, locale, &Convert.f_to_c/1, "°F", "°C")
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def format_temperature(temp, _locale), do: {temp, "°F"}
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@doc """
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Converts wind speed from mph to km/h if needed.
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Returns the wind speed in the appropriate unit for the locale.
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"""
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@spec format_wind_speed(number() | any(), String.t()) :: {number() | any(), String.t()}
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def format_wind_speed(speed, locale) when is_number(speed),
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do: format_by_unit(speed, locale, &Convert.mph_to_kph/1, "mph", "km/h")
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def format_wind_speed(speed, _locale), do: {speed, "mph"}
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@doc """
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Converts rain from inches to mm if needed.
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Returns the rain amount in the appropriate unit for the locale.
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"""
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@spec format_rain(number() | any(), String.t()) :: {number() | any(), String.t()}
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def format_rain(rain, locale) when is_number(rain),
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do: format_by_unit(rain, locale, &Convert.inches_to_mm/1, "in", "mm")
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def format_rain(rain, _locale), do: {rain, "in"}
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@doc """
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Formats pressure (keeps hPa for all locales as it's standard).
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"""
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@spec format_pressure(number() | any(), any()) :: {number() | any(), String.t()}
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def format_pressure(pressure, _locale), do: {pressure, "hPa"}
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@doc """
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Gets the appropriate unit labels for the locale.
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"""
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@spec unit_labels(String.t()) :: %{
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temperature: String.t(),
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wind_speed: String.t(),
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rain: String.t(),
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pressure: String.t()
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}
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def unit_labels(locale), do: do_unit_labels(unit_system(locale))
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defp do_unit_labels(:imperial) do
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%{
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temperature: "°F",
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wind_speed: "mph",
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rain: "in",
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pressure: "hPa"
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}
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end
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defp do_unit_labels(:metric) do
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%{
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temperature: "°C",
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wind_speed: "km/h",
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rain: "mm",
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pressure: "hPa"
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}
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end
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defp format_by_unit(value, locale, converter, imperial_unit, metric_unit) do
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case unit_system(locale) do
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:imperial -> {value, imperial_unit}
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:metric -> {converter.(value), metric_unit}
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end
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end
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end
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