package domain

import (
	"net"
	"net/url"
	"strings"
	"testing"
)

// Client describes the client requesting data about the user.
type Client struct {
	Logo        *url.URL
	URL         *url.URL
	ID          ClientID
	Name        string
	RedirectURI []*url.URL
}

// NewClient creates a new empty Client with provided ClientID, if any.
func NewClient(cid ClientID) *Client {
	return &Client{
		ID:          cid,
		Logo:        nil,
		RedirectURI: make([]*url.URL, 0),
		URL:         nil,
		Name:        "",
	}
}

// TestClient returns valid random generated client for tests.
func TestClient(tb testing.TB) *Client {
	tb.Helper()

	return &Client{
		ID:   *TestClientID(tb),
		Name: "Example App",
		URL:  &url.URL{Scheme: "https", Host: "app.example.com", Path: "/"},
		Logo: &url.URL{Scheme: "https", Host: "app.example.com", Path: "/logo.png"},
		RedirectURI: []*url.URL{
			{Scheme: "https", Host: "app.example.com", Path: "/redirect"},
			{Scheme: "https", Host: "app.example.net", Path: "/redirect"},
		},
	}
}

// ValidateRedirectURI validates RedirectURI from request to ClientID or
// registered set of client RedirectURI.
//
// If the URL scheme, host or port of the redirect_uri in the request do not
// match that of the client_id, then the authorization endpoint SHOULD verify
// that the requested redirect_uri matches one of the redirect URLs published by
// the client, and SHOULD block the request from proceeding if not.
func (c *Client) ValidateRedirectURI(redirectURI *url.URL) bool {
	if redirectURI == nil {
		return false
	}

	rHost, rPort, err := net.SplitHostPort(redirectURI.Host)
	if err != nil {
		rHost = redirectURI.Hostname()
	}

	cHost, cPort, err := net.SplitHostPort(c.ID.clientID.Host)
	if err != nil {
		cHost = c.ID.clientID.Hostname()
	}

	if strings.EqualFold(redirectURI.Scheme, c.ID.clientID.Scheme) &&
		strings.EqualFold(rHost, cHost) &&
		strings.EqualFold(rPort, cPort) {
		return true
	}

	for i := range c.RedirectURI {
		if redirectURI.String() != c.RedirectURI[i].String() {
			continue
		}

		return true
	}

	return false
}