59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
package model
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import (
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"errors"
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"slices"
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"strconv"
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"github.com/ceticamarco/zephyr/statistics"
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"github.com/ceticamarco/zephyr/types"
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)
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func GetStatistics(cityName string, statDB *types.StatDB) (types.StatResult, error) {
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// Check whether there are sufficient and updated records for the given location
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if statDB.IsKeyInvalid(cityName) {
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return types.StatResult{}, errors.New("insufficient or outdated data to perform statistical analysis")
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}
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extractTemps := func(weatherArr []types.Weather) ([]float64, error) {
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temps := make([]float64, 0, len(weatherArr))
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for _, weather := range weatherArr {
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temperature, err := strconv.ParseFloat(weather.Temperature, 64)
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if err != nil {
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return nil, err
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}
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temps = append(temps, temperature)
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}
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return temps, nil
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}
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// Extract records from the database
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stats := statDB.GetCityStatistics(cityName)
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// Extract temperatures from weather statistics
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temps, err := extractTemps(stats)
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if err != nil {
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return types.StatResult{}, err
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}
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// Detect anomalies
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anomalies := statistics.DetectAnomalies(stats)
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if len(anomalies) == 0 {
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anomalies = nil
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}
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// Compute statistics
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return types.StatResult{
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Min: strconv.FormatFloat(slices.Min(temps), 'f', -1, 64),
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Max: strconv.FormatFloat(slices.Max(temps), 'f', -1, 64),
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Count: len(stats),
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Mean: strconv.FormatFloat(statistics.Mean(temps), 'f', -1, 64),
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StdDev: strconv.FormatFloat(statistics.StdDev(temps), 'f', -1, 64),
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Median: strconv.FormatFloat(statistics.Median(temps), 'f', -1, 64),
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Mode: strconv.FormatFloat(statistics.Mode(temps), 'f', -1, 64),
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Anomaly: &anomalies,
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}, nil
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}
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