/*
   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 metadata

import (
	"bytes"
	"fmt"
	"testing"

	"github.com/coreos/coreos-cloudinit/datasource/metadata/test"
	"github.com/coreos/coreos-cloudinit/pkg"
)

func TestAvailabilityChanges(t *testing.T) {
	want := true
	if ac := (MetadataService{}).AvailabilityChanges(); ac != want {
		t.Fatalf("bad AvailabilityChanges: want %t, got %t", want, ac)
	}
}

func TestIsAvailable(t *testing.T) {
	for _, tt := range []struct {
		root       string
		apiVersion string
		resources  map[string]string
		expect     bool
	}{
		{
			root:       "/",
			apiVersion: "2009-04-04",
			resources: map[string]string{
				"/2009-04-04": "",
			},
			expect: true,
		},
		{
			root:      "/",
			resources: map[string]string{},
			expect:    false,
		},
	} {
		service := &MetadataService{
			Root:       tt.root,
			Client:     &test.HttpClient{Resources: tt.resources, Err: nil},
			ApiVersion: tt.apiVersion,
		}
		if a := service.IsAvailable(); a != tt.expect {
			t.Fatalf("bad isAvailable (%q): want %t, got %t", tt.resources, tt.expect, a)
		}
	}
}

func TestFetchUserdata(t *testing.T) {
	for _, tt := range []struct {
		root         string
		userdataPath string
		resources    map[string]string
		userdata     []byte
		clientErr    error
		expectErr    error
	}{
		{
			root:         "/",
			userdataPath: "2009-04-04/user-data",
			resources: map[string]string{
				"/2009-04-04/user-data": "hello",
			},
			userdata: []byte("hello"),
		},
		{
			root:      "/",
			clientErr: pkg.ErrNotFound{Err: fmt.Errorf("test not found error")},
			userdata:  []byte{},
		},
		{
			root:      "/",
			clientErr: pkg.ErrTimeout{Err: fmt.Errorf("test timeout error")},
			expectErr: pkg.ErrTimeout{Err: fmt.Errorf("test timeout error")},
		},
	} {
		service := &MetadataService{
			Root:         tt.root,
			Client:       &test.HttpClient{Resources: tt.resources, Err: tt.clientErr},
			UserdataPath: tt.userdataPath,
		}
		data, err := service.FetchUserdata()
		if Error(err) != Error(tt.expectErr) {
			t.Fatalf("bad error (%q): want %q, got %q", tt.resources, tt.expectErr, err)
		}
		if !bytes.Equal(data, tt.userdata) {
			t.Fatalf("bad userdata (%q): want %q, got %q", tt.resources, tt.userdata, data)
		}
	}
}

func TestUrls(t *testing.T) {
	for _, tt := range []struct {
		root         string
		userdataPath string
		metadataPath string
		expectRoot   string
		userdata     string
		metadata     string
	}{
		{
			root:         "/",
			userdataPath: "2009-04-04/user-data",
			metadataPath: "2009-04-04/meta-data",
			expectRoot:   "/",
			userdata:     "/2009-04-04/user-data",
			metadata:     "/2009-04-04/meta-data",
		},
		{
			root:         "http://169.254.169.254/",
			userdataPath: "2009-04-04/user-data",
			metadataPath: "2009-04-04/meta-data",
			expectRoot:   "http://169.254.169.254/",
			userdata:     "http://169.254.169.254/2009-04-04/user-data",
			metadata:     "http://169.254.169.254/2009-04-04/meta-data",
		},
	} {
		service := &MetadataService{
			Root:         tt.root,
			UserdataPath: tt.userdataPath,
			MetadataPath: tt.metadataPath,
		}
		if url := service.UserdataUrl(); url != tt.userdata {
			t.Fatalf("bad url (%q): want %q, got %q", tt.root, tt.userdata, url)
		}
		if url := service.MetadataUrl(); url != tt.metadata {
			t.Fatalf("bad url (%q): want %q, got %q", tt.root, tt.metadata, url)
		}
		if url := service.ConfigRoot(); url != tt.expectRoot {
			t.Fatalf("bad url (%q): want %q, got %q", tt.root, tt.expectRoot, url)
		}
	}
}

func TestNewDatasource(t *testing.T) {
	for _, tt := range []struct {
		root       string
		expectRoot string
	}{
		{
			root:       "",
			expectRoot: "/",
		},
		{
			root:       "/",
			expectRoot: "/",
		},
		{
			root:       "http://169.254.169.254",
			expectRoot: "http://169.254.169.254/",
		},
		{
			root:       "http://169.254.169.254/",
			expectRoot: "http://169.254.169.254/",
		},
	} {
		service := NewDatasource(tt.root, "", "", "")
		if service.Root != tt.expectRoot {
			t.Fatalf("bad root (%q): want %q, got %q", tt.root, tt.expectRoot, service.Root)
		}
	}
}

func Error(err error) string {
	if err != nil {
		return err.Error()
	}
	return ""
}