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package flatten
import (
"database/sql"
"fmt"
"github.com/icinga/icingadb/pkg/types"
"strconv"
)
// Flatten creates flat, one-dimensional maps from arbitrarily nested values, e.g. JSON.
func Flatten(value interface{}, prefix string) map[string]types.String {
var flatten func(string, interface{})
flattened := make(map[string]types.String)
flatten = func(key string, value interface{}) {
switch value := value.(type) {
case map[string]interface{}:
if len(value) == 0 {
flattened[key] = types.String{}
break
}
for k, v := range value {
flatten(key+"."+k, v)
}
case []interface{}:
if len(value) == 0 {
flattened[key] = types.String{}
break
}
for i, v := range value {
flatten(key+"["+strconv.Itoa(i)+"]", v)
}
default:
val := "null"
if value != nil {
val = fmt.Sprintf("%v", value)
}
flattened[key] = types.String{NullString: sql.NullString{String: val, Valid: true}}
}
}
flatten(prefix, value)
return flattened
}
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