package v2

import (
	"fmt"
	"strconv"
	"strings"

	"github.com/pkg/errors"
)

const (
	InboxNamePrefix = "inboxes/"
)

// GetNameParentTokens returns the tokens from a resource name.
func GetNameParentTokens(name string, tokenPrefixes ...string) ([]string, error) {
	parts := strings.Split(name, "/")
	if len(parts) != 2*len(tokenPrefixes) {
		return nil, errors.Errorf("invalid request %q", name)
	}

	var tokens []string
	for i, tokenPrefix := range tokenPrefixes {
		if fmt.Sprintf("%s/", parts[2*i]) != tokenPrefix {
			return nil, errors.Errorf("invalid prefix %q in request %q", tokenPrefix, name)
		}
		if parts[2*i+1] == "" {
			return nil, errors.Errorf("invalid request %q with empty prefix %q", name, tokenPrefix)
		}
		tokens = append(tokens, parts[2*i+1])
	}
	return tokens, nil
}

// GetInboxID returns the inbox ID from a resource name.
func GetInboxID(name string) (int32, error) {
	tokens, err := GetNameParentTokens(name, InboxNamePrefix)
	if err != nil {
		return 0, err
	}
	id, err := strconv.Atoi(tokens[0])
	if err != nil {
		return 0, errors.Errorf("invalid inbox ID %q", tokens[0])
	}
	return int32(id), nil
}