package starnet

import (
	"errors"
	"fmt"
)

var (
	// ErrInvalidMethod 无效的 HTTP 方法
	ErrInvalidMethod = errors.New("starnet: invalid HTTP method")

	// ErrInvalidURL 无效的 URL
	ErrInvalidURL = errors.New("starnet: invalid URL")

	// ErrInvalidIP 无效的 IP 地址
	ErrInvalidIP = errors.New("starnet: invalid IP address")

	// ErrInvalidDNS 无效的 DNS 服务器
	ErrInvalidDNS = errors.New("starnet: invalid DNS server")

	// ErrNilClient HTTP Client 为 nil
	ErrNilClient = errors.New("starnet: http client is nil")

	// ErrNilReader Reader 为 nil
	ErrNilReader = errors.New("starnet: reader is nil")

	// ErrFileNotFound 文件不存在
	ErrFileNotFound = errors.New("starnet: file not found")

	// ErrRequestNotPrepared 请求未准备好
	ErrRequestNotPrepared = errors.New("starnet: request not prepared")

	// ErrBodyAlreadyConsumed Body 已被消费
	ErrBodyAlreadyConsumed = errors.New("starnet: response body already consumed")
)

// wrapError 包装错误，添加上下文信息
func wrapError(err error, format string, args ...interface{}) error {
	if err == nil {
		return nil
	}
	msg := fmt.Sprintf(format, args...)
	return fmt.Errorf("%s: %w", msg, err)
}

var (
	// ErrNilConn indicates a nil net.Conn argument.
	ErrNilConn = errors.New("starnet: nil connection")

	// ErrNonTLSNotAllowed indicates plain TCP was detected while non-TLS is forbidden.
	ErrNonTLSNotAllowed = errors.New("starnet: non-TLS connection not allowed")

	// ErrNotTLS indicates caller asked for TLS-only object but conn is plain TCP.
	ErrNotTLS = errors.New("starnet: connection is not TLS")

	// ErrNoTLSConfig indicates TLS was detected but no usable TLS config is available.
	ErrNoTLSConfig = errors.New("starnet: no TLS config available")
)