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set_generator.go
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/
set_generator.go
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package generator
import (
"fmt"
"github.com/codingconcepts/dg/internal/pkg/model"
"github.com/codingconcepts/dg/internal/pkg/random"
"github.com/samber/lo"
)
// SetGenerator provides additional context to a set column.
type SetGenerator struct {
Values []string `yaml:"values"`
Weights []int `yaml:"weights"`
}
// Generate selects between a set of values for a given table.
func (g SetGenerator) Generate(t model.Table, c model.Column, files map[string]model.CSVFile) error {
if len(g.Values) == 0 {
return fmt.Errorf("no values provided for set generator")
}
count := len(lo.MaxBy(files[t.Name].Lines, func(a, b []string) bool {
return len(a) > len(b)
}))
if count == 0 {
count = t.Count
}
var line []string
if len(g.Weights) > 0 {
items, err := g.buildWeightedItems()
if err != nil {
return fmt.Errorf("making weighted items collection: %w", err)
}
for i := 0; i < count; i++ {
line = append(line, items.choose())
}
} else {
for i := 0; i < count; i++ {
line = append(line, g.Values[random.Intn(len(g.Values))])
}
}
AddTable(t, c.Name, line, files)
return nil
}
func (g SetGenerator) buildWeightedItems() (weightedItems, error) {
if len(g.Values) != len(g.Weights) {
return weightedItems{}, fmt.Errorf("set values and weights need to be the same")
}
weightedItems := make([]weightedItem, len(g.Values))
for i, v := range g.Values {
weightedItems = append(weightedItems, weightedItem{
Value: v,
Weight: g.Weights[i],
})
}
return makeWeightedItems(weightedItems), nil
}