// Package resolver resolves a http request to an endpoint
package resolver

import (
	"errors"
	"net/http"
)

var (
	ErrNotFound    = errors.New("not found")
	ErrInvalidPath = errors.New("invalid path")
)

// Resolver resolves requests to endpoints.
type Resolver interface {
	Resolve(r *http.Request) (*Endpoint, error)
	String() string
}

// Endpoint is the endpoint for a http request.
type Endpoint struct {
	// e.g greeter
	Name string
	// HTTP Host e.g example.com
	Host string
	// HTTP Methods e.g GET, POST
	Method string
	// HTTP Path e.g /greeter.
	Path string
}

// Options is a struct of available options.
type Options struct {
	Namespace func(*http.Request) string
	Handler   string
}

// Option is a helper for a single option.
type Option func(o *Options)

// StaticNamespace returns the same namespace for each request.
func StaticNamespace(ns string) func(*http.Request) string {
	return func(*http.Request) string {
		return ns
	}
}