Marco Cetica
e26f7ff164
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45 lines
1.3 KiB
Go
45 lines
1.3 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/cache"
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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, statCache *cache.StatCache) (types.StatResult, error) {
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// Check whether there are sufficient and updated records for the given location
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if statCache.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return types.StatResult{}, errors.New("insufficient or outdated data to perform statistical analysis")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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// Extract records from the database
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stats := statCache.GetCityStatistics(cityName)
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// Extract temperatures from statistics
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temps := make([]float64, len(stats))
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for idx, stat := range stats {
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temps[idx] = stat.Temperature
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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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