/*
   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 main

import (
	"reflect"
	"testing"

	"github.com/coreos/coreos-cloudinit/config"
)

func TestMergeCloudConfig(t *testing.T) {
	simplecc := config.CloudConfig{
		SSHAuthorizedKeys: []string{"abc", "def"},
		Hostname:          "foobar",
		NetworkConfigPath: "/path/somewhere",
		NetworkConfig:     `{}`,
	}
	for i, tt := range []struct {
		udcc config.CloudConfig
		mdcc config.CloudConfig
		want config.CloudConfig
	}{
		{
			// If mdcc is empty, udcc should be returned unchanged
			simplecc,
			config.CloudConfig{},
			simplecc,
		},
		{
			// If udcc is empty, mdcc should be returned unchanged(overridden)
			config.CloudConfig{},
			simplecc,
			simplecc,
		},
		{
			// user-data should override completely in the case of conflicts
			simplecc,
			config.CloudConfig{
				Hostname:          "meta-hostname",
				NetworkConfigPath: "/path/meta",
				NetworkConfig:     `{"hostname":"test"}`,
			},
			simplecc,
		},
		{
			// Mixed merge should succeed
			config.CloudConfig{
				SSHAuthorizedKeys: []string{"abc", "def"},
				Hostname:          "user-hostname",
				NetworkConfigPath: "/path/somewhere",
				NetworkConfig:     `{"hostname":"test"}`,
			},
			config.CloudConfig{
				SSHAuthorizedKeys: []string{"woof", "qux"},
				Hostname:          "meta-hostname",
			},
			config.CloudConfig{
				SSHAuthorizedKeys: []string{"abc", "def", "woof", "qux"},
				Hostname:          "user-hostname",
				NetworkConfigPath: "/path/somewhere",
				NetworkConfig:     `{"hostname":"test"}`,
			},
		},
		{
			// Completely non-conflicting merge should be fine
			config.CloudConfig{
				Hostname: "supercool",
			},
			config.CloudConfig{
				SSHAuthorizedKeys: []string{"zaphod", "beeblebrox"},
				NetworkConfigPath: "/dev/fun",
				NetworkConfig:     `{"hostname":"test"}`,
			},
			config.CloudConfig{
				Hostname:          "supercool",
				SSHAuthorizedKeys: []string{"zaphod", "beeblebrox"},
				NetworkConfigPath: "/dev/fun",
				NetworkConfig:     `{"hostname":"test"}`,
			},
		},
		{
			// Non-mergeable settings in user-data should not be affected
			config.CloudConfig{
				Hostname:       "mememe",
				ManageEtcHosts: config.EtcHosts("lolz"),
			},
			config.CloudConfig{
				Hostname:          "youyouyou",
				NetworkConfigPath: "meta-meta-yo",
				NetworkConfig:     `{"hostname":"test"}`,
			},
			config.CloudConfig{
				Hostname:          "mememe",
				ManageEtcHosts:    config.EtcHosts("lolz"),
				NetworkConfigPath: "meta-meta-yo",
				NetworkConfig:     `{"hostname":"test"}`,
			},
		},
		{
			// Non-mergeable (unexpected) settings in meta-data are ignored
			config.CloudConfig{
				Hostname: "mememe",
			},
			config.CloudConfig{
				ManageEtcHosts:    config.EtcHosts("lolz"),
				NetworkConfigPath: "meta-meta-yo",
				NetworkConfig:     `{"hostname":"test"}`,
			},
			config.CloudConfig{
				Hostname:          "mememe",
				NetworkConfigPath: "meta-meta-yo",
				NetworkConfig:     `{"hostname":"test"}`,
			},
		},
	} {
		got := mergeCloudConfig(tt.mdcc, tt.udcc)
		if !reflect.DeepEqual(got, tt.want) {
			t.Errorf("case #%d: mergeCloudConfig mutated CloudConfig unexpectedly:\ngot:\n%s\nwant:\n%s", i, got, tt.want)
		}
	}
}