package yaml_utils

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestUpdateYamlValue(t *testing.T) {
	tests := []struct {
		name        string
		in          string
		path        []string
		value       string
		expectedOut string
		expectedErr string
	}{
		{
			name:        "update value",
			in:          "foo: bar\n",
			path:        []string{"foo"},
			value:       "baz",
			expectedOut: "foo: baz\n",
			expectedErr: "",
		},
		{
			name:        "add new key and value",
			in:          "foo: bar\n",
			path:        []string{"foo2"},
			value:       "baz",
			expectedOut: "foo: bar\nfoo2: baz\n",
			expectedErr: "",
		},
		{
			name:        "add new key and value when document was empty",
			in:          "",
			path:        []string{"foo"},
			value:       "bar",
			expectedOut: "foo: bar\n",
			expectedErr: "",
		},
		{
			name:        "preserve inline comment",
			in:          "foo: bar # my comment\n",
			path:        []string{"foo2"},
			value:       "baz",
			expectedOut: "foo: bar # my comment\nfoo2: baz\n",
			expectedErr: "",
		},
		{
			name:  "nested update",
			in:    "foo:\n  bar: baz\n",
			path:  []string{"foo", "bar"},
			value: "qux",
			// indentation is not preserved. See https://github.com/go-yaml/yaml/issues/899
			expectedOut: "foo:\n    bar: qux\n",
			expectedErr: "",
		},
		{
			name:        "nested where parents doesn't exist yet",
			in:          "",
			path:        []string{"foo", "bar", "baz"},
			value:       "qux",
			expectedOut: "foo:\n    bar:\n        baz: qux\n",
			expectedErr: "",
		},
		{
			name:        "don't rewrite file if value didn't change",
			in:          "foo:\n  bar: baz\n",
			path:        []string{"foo", "bar"},
			value:       "baz",
			expectedOut: "foo:\n  bar: baz\n",
			expectedErr: "",
		},

		// Error cases
		{
			name:        "existing document is not a dictionary",
			in:          "42\n",
			path:        []string{"foo"},
			value:       "bar",
			expectedOut: "42\n",
			expectedErr: "yaml document is not a dictionary",
		},
		{
			name:        "trying to update a note that is not a scalar",
			in:          "foo: [1, 2, 3]\n",
			path:        []string{"foo"},
			value:       "bar",
			expectedOut: "foo: [1, 2, 3]\n",
			expectedErr: "yaml node is not a scalar",
		},
		{
			name:        "not all path elements are dictionaries",
			in:          "foo:\n  bar: [1, 2, 3]\n",
			path:        []string{"foo", "bar", "baz"},
			value:       "qux",
			expectedOut: "foo:\n  bar: [1, 2, 3]\n",
			expectedErr: "yaml node in path is not a dictionary",
		},
	}

	for _, test := range tests {
		test := test
		t.Run(test.name, func(t *testing.T) {
			out, actualErr := UpdateYamlValue([]byte(test.in), test.path, test.value)
			if test.expectedErr == "" {
				assert.NoError(t, actualErr)
			} else {
				assert.EqualError(t, actualErr, test.expectedErr)
			}

			assert.Equal(t, test.expectedOut, string(out))
		})
	}
}

func TestRenameYamlKey(t *testing.T) {
	tests := []struct {
		name        string
		in          string
		path        []string
		newKey      string
		expectedOut string
		expectedErr string
	}{
		{
			name:        "rename key",
			in:          "foo: 5\n",
			path:        []string{"foo"},
			newKey:      "bar",
			expectedOut: "bar: 5\n",
			expectedErr: "",
		},
		{
			name:   "rename key, nested",
			in:     "foo:\n  bar: 5\n",
			path:   []string{"foo", "bar"},
			newKey: "baz",
			// indentation is not preserved. See https://github.com/go-yaml/yaml/issues/899
			expectedOut: "foo:\n    baz: 5\n",
			expectedErr: "",
		},
		{
			name:   "rename non-scalar key",
			in:     "foo:\n  bar: 5\n",
			path:   []string{"foo"},
			newKey: "qux",
			// indentation is not preserved. See https://github.com/go-yaml/yaml/issues/899
			expectedOut: "qux:\n    bar: 5\n",
			expectedErr: "",
		},
		{
			name:        "don't rewrite file if value didn't change",
			in:          "foo:\n  bar: 5\n",
			path:        []string{"nonExistingKey"},
			newKey:      "qux",
			expectedOut: "foo:\n  bar: 5\n",
			expectedErr: "",
		},

		// Error cases
		{
			name:        "existing document is not a dictionary",
			in:          "42\n",
			path:        []string{"foo"},
			newKey:      "bar",
			expectedOut: "42\n",
			expectedErr: "yaml node in path is not a dictionary",
		},
		{
			name:        "not all path elements are dictionaries",
			in:          "foo:\n  bar: [1, 2, 3]\n",
			path:        []string{"foo", "bar", "baz"},
			newKey:      "qux",
			expectedOut: "foo:\n  bar: [1, 2, 3]\n",
			expectedErr: "yaml node in path is not a dictionary",
		},
		{
			name:        "new key exists",
			in:          "foo: 5\nbar: 7\n",
			path:        []string{"foo"},
			newKey:      "bar",
			expectedOut: "foo: 5\nbar: 7\n",
			expectedErr: "new key `bar' already exists",
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			out, actualErr := RenameYamlKey([]byte(test.in), test.path, test.newKey)
			if test.expectedErr == "" {
				assert.NoError(t, actualErr)
			} else {
				assert.EqualError(t, actualErr, test.expectedErr)
			}

			assert.Equal(t, test.expectedOut, string(out))
		})
	}
}