package ultraviolet

import (
	"strconv"
	"strings"
)

type Selector func(expression any) *SQ

func ExpressionToSelector(expression string) Selector {
	return func(value any) *SQ {
		// TODO: lock value mutex
		parts := strings.Split(expression, ".")
		result := NewSQ(value)

		for _, part := range parts {
			index, err := strconv.Atoi(part)
			if err == nil {
				result = result.Index(index)
				continue
			}

			resultField := result.Field(part)
			if resultField != nil {
				result = resultField
				continue
			}

			result = result.Key(part)
		}

		return result
	}
}