/*
   Copyright 2014 CoreOS, Inc.

   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 flags

import (
	"flag"
	"net/url"
	"os"
	"reflect"
	"testing"

	"github.com/coreos/etcd/pkg/transport"
)

func TestSetFlagsFromEnv(t *testing.T) {
	fs := flag.NewFlagSet("testing", flag.ExitOnError)
	fs.String("a", "", "")
	fs.String("b", "", "")
	fs.String("c", "", "")
	fs.Parse([]string{})

	os.Clearenv()
	// flags should be settable using env vars
	os.Setenv("ETCD_A", "foo")
	// and command-line flags
	if err := fs.Set("b", "bar"); err != nil {
		t.Fatal(err)
	}
	// command-line flags take precedence over env vars
	os.Setenv("ETCD_C", "woof")
	if err := fs.Set("c", "quack"); err != nil {
		t.Fatal(err)
	}

	// first verify that flags are as expected before reading the env
	for f, want := range map[string]string{
		"a": "",
		"b": "bar",
		"c": "quack",
	} {
		if got := fs.Lookup(f).Value.String(); got != want {
			t.Fatalf("flag %q=%q, want %q", f, got, want)
		}
	}

	// now read the env and verify flags were updated as expected
	err := SetFlagsFromEnv(fs)
	if err != nil {
		t.Errorf("err=%v, want nil", err)
	}
	for f, want := range map[string]string{
		"a": "foo",
		"b": "bar",
		"c": "quack",
	} {
		if got := fs.Lookup(f).Value.String(); got != want {
			t.Errorf("flag %q=%q, want %q", f, got, want)
		}
	}
}

func TestSetFlagsFromEnvBad(t *testing.T) {
	// now verify that an error is propagated
	fs := flag.NewFlagSet("testing", flag.ExitOnError)
	fs.Int("x", 0, "")
	os.Setenv("ETCD_X", "not_a_number")
	if err := SetFlagsFromEnv(fs); err == nil {
		t.Errorf("err=nil, want != nil")
	}
}

func TestURLsFromFlags(t *testing.T) {
	tests := []struct {
		args     []string
		tlsInfo  transport.TLSInfo
		wantURLs []url.URL
		wantFail bool
	}{
		// use -urls default when no flags defined
		{
			args:    []string{},
			tlsInfo: transport.TLSInfo{},
			wantURLs: []url.URL{
				url.URL{Scheme: "http", Host: "127.0.0.1:2379"},
			},
			wantFail: false,
		},

		// explicitly setting -urls should carry through
		{
			args:    []string{"-urls=https://192.0.3.17:2930,http://127.0.0.1:1024"},
			tlsInfo: transport.TLSInfo{},
			wantURLs: []url.URL{
				url.URL{Scheme: "http", Host: "127.0.0.1:1024"},
				url.URL{Scheme: "https", Host: "192.0.3.17:2930"},
			},
			wantFail: false,
		},

		// explicitly setting -addr should carry through
		{
			args:    []string{"-addr=192.0.2.3:1024"},
			tlsInfo: transport.TLSInfo{},
			wantURLs: []url.URL{
				url.URL{Scheme: "http", Host: "192.0.2.3:1024"},
			},
			wantFail: false,
		},

		// scheme prepended to -addr should be https if TLSInfo non-empty
		{
			args: []string{"-addr=192.0.2.3:1024"},
			tlsInfo: transport.TLSInfo{
				CertFile: "/tmp/foo",
				KeyFile:  "/tmp/bar",
			},
			wantURLs: []url.URL{
				url.URL{Scheme: "https", Host: "192.0.2.3:1024"},
			},
			wantFail: false,
		},

		// explicitly setting both -urls and -addr should fail
		{
			args:     []string{"-urls=https://127.0.0.1:1024", "-addr=192.0.2.3:1024"},
			tlsInfo:  transport.TLSInfo{},
			wantURLs: nil,
			wantFail: true,
		},
	}

	for i, tt := range tests {
		fs := flag.NewFlagSet("test", flag.PanicOnError)
		fs.Var(NewURLsValue("http://127.0.0.1:2379"), "urls", "")
		fs.Var(&IPAddressPort{}, "addr", "")

		if err := fs.Parse(tt.args); err != nil {
			t.Errorf("#%d: failed to parse flags: %v", i, err)
			continue
		}

		gotURLs, err := URLsFromFlags(fs, "urls", "addr", tt.tlsInfo)
		if tt.wantFail != (err != nil) {
			t.Errorf("#%d: wantFail=%t, got err=%v", i, tt.wantFail, err)
			continue
		}

		if !reflect.DeepEqual(tt.wantURLs, gotURLs) {
			t.Errorf("#%d: incorrect URLs\nwant=%#v\ngot=%#v", i, tt.wantURLs, gotURLs)
		}
	}
}