package errors

import (
	"io"
	"strings"
)

func ErrorToString(e error) string {
	builder := &strings.Builder{}
	AppendError(builder, e, 0)
	return builder.String()
}

func AppendError(writer io.StringWriter, err error, depth uint) {
	padding := strings.Repeat(" ", int(depth))

	var uniError UniverseError
	if As(err, &uniError) {
		errorType := uniError.Type()
		if errorType != nil {
			_, _ = writer.WriteString(errorType.Name)
			_, _ = writer.WriteString(": ")
		}

		_, _ = writer.WriteString(uniError.Message())

		stack := uniError.StackTrace()
		if stack != nil {
			for _, value := range stack {
				_, _ = writer.WriteString("\n")
				_, _ = writer.WriteString(padding)
				_, _ = writer.WriteString(value)
			}
		}

		cause := uniError.Cause()
		if cause != nil {
			_, _ = writer.WriteString("\n")
			_, _ = writer.WriteString(padding)
			_, _ = writer.WriteString("Caused by: ")
			AppendError(writer, cause, depth+1)
		}

	} else {
		_, _ = writer.WriteString(err.Error())
	}
}