package iterate

import (
  "fmt"
  "strings"

  nativemetadata "github.com/samchon/typia/packages/typia/native/core/schemas/metadata"
  nativeutils "github.com/samchon/typia/packages/typia/native/core/utils"
)

func metadata_to_pattern(props struct {
  top      bool
  metadata *nativemetadata.MetadataSchema
}) string {
  for _, atomic := range props.metadata.Atomics {
    if atomic.Type == "string" {
      return "(.*)"
    }
  }

  values := []string{}
  for _, constant := range props.metadata.Constants {
    if constant.Type != "string" {
      for _, value := range constant.Values {
        values = append(values, fmt.Sprint(value.Value))
      }
      continue
    }
    for _, value := range constant.Values {
      if str, ok := value.Value.(string); ok {
        values = append(values, nativeutils.PatternUtil.Escape(str))
      } else {
        values = append(values, nativeutils.PatternUtil.Escape(fmt.Sprint(value.Value)))
      }
    }
  }
  for _, atomic := range props.metadata.Atomics {
    if atomic.Type == "number" || atomic.Type == "bigint" {
      values = append(values, nativeutils.PatternUtil.NUMBER)
    } else if atomic.Type == "boolean" {
      values = append(values, nativeutils.PatternUtil.BOOLEAN)
    }
  }
  for _, template := range props.metadata.Templates {
    values = append(values, "("+template_to_pattern(struct {
      top      bool
      template []*nativemetadata.MetadataSchema
    }{
      top:      false,
      template: template.Row,
    })+")")
  }

  pattern := ""
  if len(values) == 1 {
    pattern = values[0]
  } else {
    pattern = "(" + strings.Join(values, "|") + ")"
  }
  if props.top {
    return nativeutils.PatternUtil.Fix(pattern)
  }
  return pattern
}