/*
   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 waagent

import (
	"encoding/json"
	"os"
	"reflect"
	"testing"
)

type mockFilesystem map[string][]byte

func (m mockFilesystem) readFile(filename string) ([]byte, error) {
	if contents := m[filename]; contents != nil {
		return contents, nil
	}
	return nil, os.ErrNotExist
}

func TestFetchMetadata(t *testing.T) {
	for _, tt := range []struct {
		root     string
		files    mockFilesystem
		metadata map[string]string
	}{
		{
			"/",
			mockFilesystem{},
			nil,
		},
		{
			"/",
			mockFilesystem{"/SharedConfig.xml": []byte("")},
			nil,
		},
		{
			"/var/lib/waagent",
			mockFilesystem{"/var/lib/waagent/SharedConfig.xml": []byte("")},
			nil,
		},
		{
			"/var/lib/waagent",
			mockFilesystem{"/var/lib/waagent/SharedConfig.xml": []byte(`<?xml version="1.0" encoding="utf-8"?>
<SharedConfig version="1.0.0.0" goalStateIncarnation="1">
  <Deployment name="c8f9e4c9c18948e1bebf57c5685da756" guid="{1d10394f-c741-4a1a-a6bb-278f213c5a5e}" incarnation="0" isNonCancellableTopologyChangeEnabled="false">
    <Service name="core-test-1" guid="{00000000-0000-0000-0000-000000000000}" />
    <ServiceInstance name="c8f9e4c9c18948e1bebf57c5685da756.0" guid="{1e202e9a-8ffe-4915-b6ef-4118c9628fda}" />
  </Deployment>
  <Incarnation number="1" instance="core-test-1" guid="{8767eb4b-b445-4783-b1f5-6c0beaf41ea0}" />
  <Role guid="{53ecc81e-257f-fbc9-a53a-8cf1a0a122b4}" name="core-test-1" settleTimeSeconds="0" />
  <LoadBalancerSettings timeoutSeconds="0" waitLoadBalancerProbeCount="8">
    <Probes>
      <Probe name="D41D8CD98F00B204E9800998ECF8427E" />
      <Probe name="C9DEC1518E1158748FA4B6081A8266DD" />
    </Probes>
  </LoadBalancerSettings>
  <OutputEndpoints>
    <Endpoint name="core-test-1:openInternalEndpoint" type="SFS">
      <Target instance="core-test-1" endpoint="openInternalEndpoint" />
    </Endpoint>
  </OutputEndpoints>
  <Instances>
    <Instance id="core-test-1" address="100.73.202.64">
      <FaultDomains randomId="0" updateId="0" updateCount="0" />
      <InputEndpoints>
        <Endpoint name="openInternalEndpoint" address="100.73.202.64" protocol="any" isPublic="false" enableDirectServerReturn="false" isDirectAddress="false" disableStealthMode="false">
          <LocalPorts>
            <LocalPortSelfManaged />
          </LocalPorts>
        </Endpoint>
        <Endpoint name="ssh" address="100.73.202.64:22" protocol="tcp" hostName="core-test-1ContractContract" isPublic="true" loadBalancedPublicAddress="191.239.39.77:22" enableDirectServerReturn="false" isDirectAddress="false" disableStealthMode="false">
          <LocalPorts>
            <LocalPortRange from="22" to="22" />
          </LocalPorts>
        </Endpoint>
      </InputEndpoints>
    </Instance>
  </Instances>
</SharedConfig>`)},
			map[string]string{
				"local-ipv4":  "100.73.202.64",
				"public-ipv4": "191.239.39.77",
			},
		},
	} {
		a := waagent{tt.root, tt.files.readFile}
		metadataBytes, err := a.FetchMetadata()
		if err != nil {
			t.Fatalf("bad error for %q: want %q, got %q", tt, nil, err)
		}
		var metadata map[string]string
		if len(metadataBytes) > 0 {
			if err := json.Unmarshal(metadataBytes, &metadata); err != nil {
				panic(err)
			}
		}
		if !reflect.DeepEqual(tt.metadata, metadata) {
			t.Fatalf("bad metadata for %q: want %q, got %q", tt, tt.metadata, metadata)
		}
	}
}

func TestFetchUserdata(t *testing.T) {
	for _, tt := range []struct {
		root  string
		files mockFilesystem
	}{
		{
			"/",
			mockFilesystem{},
		},
		{
			"/",
			mockFilesystem{"/CustomData": []byte{}},
		},
		{
			"/var/lib/waagent/",
			mockFilesystem{"/var/lib/waagent/CustomData": []byte{}},
		},
	} {
		a := waagent{tt.root, tt.files.readFile}
		_, err := a.FetchUserdata()
		if err != nil {
			t.Fatalf("bad error for %q: want %q, got %q", tt, nil, err)
		}
	}
}

func TestConfigRoot(t *testing.T) {
	for _, tt := range []struct {
		root       string
		configRoot string
	}{
		{
			"/",
			"/",
		},
		{
			"/var/lib/waagent",
			"/var/lib/waagent",
		},
	} {
		a := waagent{tt.root, nil}
		if configRoot := a.ConfigRoot(); configRoot != tt.configRoot {
			t.Fatalf("bad config root for %q: want %q, got %q", tt, tt.configRoot, configRoot)
		}
	}
}

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