/*
 *
 * Copyright 2017 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package grpc

import (
	"fmt"
	"net"
	"testing"
	"time"

	"google.golang.org/grpc/resolver"
)

func TestParseTarget(t *testing.T) {
	for _, test := range []resolver.Target{
		{Scheme: "dns", Authority: "", Endpoint: "google.com"},
		{Scheme: "dns", Authority: "a.server.com", Endpoint: "google.com"},
		{Scheme: "dns", Authority: "a.server.com", Endpoint: "google.com/?a=b"},
		{Scheme: "passthrough", Authority: "", Endpoint: "/unix/socket/address"},
	} {
		str := test.Scheme + "://" + test.Authority + "/" + test.Endpoint
		got := parseTarget(str)
		if got != test {
			t.Errorf("parseTarget(%q) = %+v, want %+v", str, got, test)
		}
	}
}

func TestParseTargetString(t *testing.T) {
	for _, test := range []struct {
		targetStr string
		want      resolver.Target
	}{
		{targetStr: "", want: resolver.Target{Scheme: "", Authority: "", Endpoint: ""}},
		{targetStr: ":///", want: resolver.Target{Scheme: "", Authority: "", Endpoint: ""}},
		{targetStr: "a:///", want: resolver.Target{Scheme: "a", Authority: "", Endpoint: ""}},
		{targetStr: "://a/", want: resolver.Target{Scheme: "", Authority: "a", Endpoint: ""}},
		{targetStr: ":///a", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "a"}},
		{targetStr: "a://b/", want: resolver.Target{Scheme: "a", Authority: "b", Endpoint: ""}},
		{targetStr: "a:///b", want: resolver.Target{Scheme: "a", Authority: "", Endpoint: "b"}},
		{targetStr: "://a/b", want: resolver.Target{Scheme: "", Authority: "a", Endpoint: "b"}},
		{targetStr: "a://b/c", want: resolver.Target{Scheme: "a", Authority: "b", Endpoint: "c"}},
		{targetStr: "dns:///google.com", want: resolver.Target{Scheme: "dns", Authority: "", Endpoint: "google.com"}},
		{targetStr: "dns://a.server.com/google.com", want: resolver.Target{Scheme: "dns", Authority: "a.server.com", Endpoint: "google.com"}},
		{targetStr: "dns://a.server.com/google.com/?a=b", want: resolver.Target{Scheme: "dns", Authority: "a.server.com", Endpoint: "google.com/?a=b"}},

		{targetStr: "/", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "/"}},
		{targetStr: "google.com", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "google.com"}},
		{targetStr: "google.com/?a=b", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "google.com/?a=b"}},
		{targetStr: "/unix/socket/address", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "/unix/socket/address"}},

		// If we can only parse part of the target.
		{targetStr: "://", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "://"}},
		{targetStr: "unix://domain", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "unix://domain"}},
		{targetStr: "a:b", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "a:b"}},
		{targetStr: "a/b", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "a/b"}},
		{targetStr: "a:/b", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "a:/b"}},
		{targetStr: "a//b", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "a//b"}},
		{targetStr: "a://b", want: resolver.Target{Scheme: "", Authority: "", Endpoint: "a://b"}},
	} {
		got := parseTarget(test.targetStr)
		if got != test.want {
			t.Errorf("parseTarget(%q) = %+v, want %+v", test.targetStr, got, test.want)
		}
	}
}

// The target string with unknown scheme should be kept unchanged and passed to
// the dialer.
func TestDialParseTargetUnknownScheme(t *testing.T) {
	for _, test := range []struct {
		targetStr string
		want      string
	}{
		{"/unix/socket/address", "/unix/socket/address"},

		// Special test for "unix:///".
		{"unix:///unix/socket/address", "unix:///unix/socket/address"},

		// For known scheme.
		{"passthrough://a.server.com/google.com", "google.com"},
	} {
		dialStrCh := make(chan string, 1)
		cc, err := Dial(test.targetStr, WithInsecure(), WithDialer(func(addr string, _ time.Duration) (net.Conn, error) {
			select {
			case dialStrCh <- addr:
			default:
			}
			return nil, fmt.Errorf("test dialer, always error")
		}))
		if err != nil {
			t.Fatalf("Failed to create ClientConn: %v", err)
		}
		got := <-dialStrCh
		cc.Close()
		if got != test.want {
			t.Errorf("Dial(%q), dialer got %q, want %q", test.targetStr, got, test.want)
		}
	}
}