// AddParameter adds new custom parameter to the Template. It overrides
// the existing parameter, if already defined.
func AddParameter(t *api.Template, param api.Parameter) {
	if existing := GetParameterByName(t, param.Name); existing != nil {
		*existing = param
	} else {
		t.Parameters = append(t.Parameters, param)
	}
}
func TestEvaluateLabels(t *testing.T) {
	testCases := map[string]struct {
		Input  string
		Output string
		Labels map[string]string
	}{
		"no labels": {
			Input: `{
				"kind":"Template", "apiVersion":"v1",
				"objects": [
					{
						"kind": "Service", "apiVersion": "v1beta3",
						"metadata": {"labels": {"key1": "v1", "key2": "v2"}	}
					}
				]
			}`,
			Output: `{
				"kind":"Template","apiVersion":"v1beta3","metadata":{"creationTimestamp":null},
				"objects":[
					{
						"apiVersion":"v1beta3","kind":"Service","metadata":{
						"labels":{"key1":"v1","key2":"v2"}}
					}
				]
			}`,
		},
		"one different label": {
			Input: `{
				"kind":"Template", "apiVersion":"v1",
				"objects": [
					{
						"kind": "Service", "apiVersion": "v1beta3",
						"metadata": {"labels": {"key1": "v1", "key2": "v2"}	}
					}
				]
			}`,
			Output: `{
				"kind":"Template","apiVersion":"v1beta3","metadata":{"creationTimestamp":null},
				"objects":[
					{
						"apiVersion":"v1beta3","kind":"Service","metadata":{
						"labels":{"key1":"v1","key2":"v2","key3":"v3"}}
					}
				],
				"labels":{"key3":"v3"}
			}`,
			Labels: map[string]string{"key3": "v3"},
		},
		"when the root object has labels and no metadata": {
			Input: `{
				"kind":"Template", "apiVersion":"v1",
				"objects": [
					{
						"kind": "Service", "apiVersion": "v1beta1",
						"labels": {
							"key1": "v1",
							"key2": "v2"
						}
					}
				]
			}`,
			Output: `{
				"kind":"Template","apiVersion":"v1beta3","metadata":{"creationTimestamp":null},
				"objects":[
					{
						"apiVersion":"v1beta1","kind":"Service",
						"labels":{"key1":"v1","key2":"v2","key3":"v3"}
					}
				],
				"labels":{"key3":"v3"}
			}`,
			Labels: map[string]string{"key3": "v3"},
		},
		"when the root object has labels and metadata": {
			Input: `{
				"kind":"Template", "apiVersion":"v1",
				"objects": [
					{
						"kind": "Service", "apiVersion": "v1beta1",
						"metadata": {},
						"labels": {
							"key1": "v1",
							"key2": "v2"
						}
					}
				]
			}`,
			Output: `{
				"kind":"Template","apiVersion":"v1beta3","metadata":{"creationTimestamp":null},
				"objects":[
					{
						"apiVersion":"v1beta1","kind":"Service",
						"labels":{"key1":"v1","key2":"v2"},
						"metadata":{"labels":{"key3":"v3"}}
					}
				],
				"labels":{"key3":"v3"}
			}`,
			Labels: map[string]string{"key3": "v3"},
		},
		"overwrites label": {
			Input: `{
				"kind":"Template", "apiVersion":"v1",
				"objects": [
					{
						"kind": "Service", "apiVersion": "v1beta3",
						"metadata": {"labels": {"key1": "v1", "key2": "v2"}	}
					}
				]
			}`,
			Output: `{
				"kind":"Template","apiVersion":"v1beta3","metadata":{"creationTimestamp":null},
				"objects":[
					{
						"apiVersion":"v1beta3","kind":"Service","metadata":{
						"labels":{"key1":"v1","key2":"v3"}}
					}
				],
				"labels":{"key2":"v3"}
			}`,
			Labels: map[string]string{"key2": "v3"},
		},
	}

	for k, testCase := range testCases {
		var template api.Template
		if err := latest.Codec.DecodeInto([]byte(testCase.Input), &template); err != nil {
			t.Errorf("%s: unexpected error: %v", k, err)
			continue
		}

		generators := map[string]generator.Generator{
			"expression": generator.NewExpressionValueGenerator(rand.New(rand.NewSource(1337))),
		}
		processor := NewProcessor(generators)

		template.ObjectLabels = testCase.Labels

		// Transform the template config into the result config
		errs := processor.Process(&template)
		if len(errs) > 0 {
			t.Errorf("%s: unexpected error: %v", k, errs)
			continue
		}
		result, err := v1beta3.Codec.Encode(&template)
		if err != nil {
			t.Errorf("%s: unexpected error: %v", k, err)
			continue
		}
		expect := testCase.Output
		expect = trailingWhitespace.ReplaceAllString(expect, "")
		if expect != string(result) {
			t.Errorf("%s: unexpected output: %s", k, util.StringDiff(expect, string(result)))
			continue
		}
	}
}