package navicat

import "fmt"

// Error is a tunnel-layer or remote MySQL error. It never includes passwords or tokens.
type Error struct {
	Kind       string // http, tunnel, mysql
	HTTPStatus int
	Errno      uint32
	Message    string
}

func (e *Error) Error() string {
	if e == nil {
		return ""
	}
	msg := e.Message
	if msg == "" {
		msg = "unknown error"
	}
	switch e.Kind {
	case "http":
		if e.HTTPStatus != 0 {
			return fmt.Sprintf("tunnel http %d: %s", e.HTTPStatus, msg)
		}
		return "tunnel http: " + msg
	case "mysql":
		return fmt.Sprintf("mysql errno %d: %s", e.Errno, msg)
	default:
		return fmtErrno(e.Errno, msg)
	}
}

func headerError(h Header, httpStatus int) *Error {
	kind := "tunnel"
	switch h.Errno {
	case ErrnoUnsupportedPHP, ErrnoInvalidParams, ErrnoMySQLMissing, ErrnoInvalidToken:
		kind = "tunnel"
	default:
		if h.Errno > 0 {
			kind = "mysql"
		}
	}
	return &Error{Kind: kind, HTTPStatus: httpStatus, Errno: h.Errno, Message: h.Message}
}