package terraform

import (
	"encoding/json"
	"testing"

	tfjson "github.com/hashicorp/terraform-json"
	"github.com/stretchr/testify/require"

	"github.com/coder/coder/v2/provisionersdk/proto"
)

type mockLogger struct {
	logs []*proto.Log
}

var _ logSink = &mockLogger{}

func (m *mockLogger) ProvisionLog(l proto.LogLevel, o string) {
	m.logs = append(m.logs, &proto.Log{Level: l, Output: o})
}

func TestLogWriter_Mainline(t *testing.T) {
	t.Parallel()

	logr := &mockLogger{}
	writer, doneLogging := logWriter(logr, proto.LogLevel_INFO)

	_, err := writer.Write([]byte(`Sitting in an English garden
Waiting for the sun
If the sun don't come you get a tan
From standing in the English rain`))
	require.NoError(t, err)
	err = writer.Close()
	require.NoError(t, err)
	<-doneLogging

	expected := []*proto.Log{
		{Level: proto.LogLevel_INFO, Output: "Sitting in an English garden"},
		{Level: proto.LogLevel_INFO, Output: "Waiting for the sun"},
		{Level: proto.LogLevel_INFO, Output: "If the sun don't come you get a tan"},
		{Level: proto.LogLevel_INFO, Output: "From standing in the English rain"},
	}
	require.Equal(t, expected, logr.logs)
}

func TestOnlyDataResources(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name     string
		stateMod *tfjson.StateModule
		expected *tfjson.StateModule
	}{
		{
			name:     "empty state module",
			stateMod: &tfjson.StateModule{},
			expected: &tfjson.StateModule{},
		},
		{
			name: "only data resources",
			stateMod: &tfjson.StateModule{
				Resources: []*tfjson.StateResource{
					{Name: "cat", Type: "coder_parameter", Mode: "data", Address: "cat-address"},
					{Name: "cow", Type: "foobaz", Mode: "data", Address: "cow-address"},
				},
				ChildModules: []*tfjson.StateModule{
					{
						Resources: []*tfjson.StateResource{
							{Name: "child-cat", Type: "coder_parameter", Mode: "data", Address: "child-cat-address"},
							{Name: "child-dog", Type: "foobar", Mode: "data", Address: "child-dog-address"},
						},
						Address: "child-module-1",
					},
				},
				Address: "fake-module",
			},
			expected: &tfjson.StateModule{
				Resources: []*tfjson.StateResource{
					{Name: "cat", Type: "coder_parameter", Mode: "data", Address: "cat-address"},
					{Name: "cow", Type: "foobaz", Mode: "data", Address: "cow-address"},
				},
				ChildModules: []*tfjson.StateModule{
					{
						Resources: []*tfjson.StateResource{
							{Name: "child-cat", Type: "coder_parameter", Mode: "data", Address: "child-cat-address"},
							{Name: "child-dog", Type: "foobar", Mode: "data", Address: "child-dog-address"},
						},
						Address: "child-module-1",
					},
				},
				Address: "fake-module",
			},
		},
		{
			name: "only non-data resources",
			stateMod: &tfjson.StateModule{
				Resources: []*tfjson.StateResource{
					{Name: "cat", Type: "coder_parameter", Mode: "foobar", Address: "cat-address"},
					{Name: "cow", Type: "foobaz", Mode: "foo", Address: "cow-address"},
				},
				ChildModules: []*tfjson.StateModule{
					{
						Resources: []*tfjson.StateResource{
							{Name: "child-cat", Type: "coder_parameter", Mode: "foobar", Address: "child-cat-address"},
							{Name: "child-dog", Type: "foobar", Mode: "foobaz", Address: "child-dog-address"},
						},
						Address: "child-module-1",
					},
				},
				Address: "fake-module",
			},
			expected: &tfjson.StateModule{
				Address: "fake-module",
				ChildModules: []*tfjson.StateModule{
					{Address: "child-module-1"},
				},
			},
		},
		{
			name: "mixed resources",
			stateMod: &tfjson.StateModule{
				Resources: []*tfjson.StateResource{
					{Name: "cat", Type: "coder_parameter", Mode: "data", Address: "cat-address"},
					{Name: "dog", Type: "foobar", Mode: "magic", Address: "dog-address"},
					{Name: "cow", Type: "foobaz", Mode: "data", Address: "cow-address"},
				},
				ChildModules: []*tfjson.StateModule{
					{
						Resources: []*tfjson.StateResource{
							{Name: "child-cat", Type: "coder_parameter", Mode: "data", Address: "child-cat-address"},
							{Name: "child-dog", Type: "foobar", Mode: "data", Address: "child-dog-address"},
							{Name: "child-cow", Type: "foobaz", Mode: "magic", Address: "child-cow-address"},
						},
						Address: "child-module-1",
					},
				},
				Address: "fake-module",
			},
			expected: &tfjson.StateModule{
				Resources: []*tfjson.StateResource{
					{Name: "cat", Type: "coder_parameter", Mode: "data", Address: "cat-address"},
					{Name: "cow", Type: "foobaz", Mode: "data", Address: "cow-address"},
				},
				ChildModules: []*tfjson.StateModule{
					{
						Resources: []*tfjson.StateResource{
							{Name: "child-cat", Type: "coder_parameter", Mode: "data", Address: "child-cat-address"},
							{Name: "child-dog", Type: "foobar", Mode: "data", Address: "child-dog-address"},
						},
						Address: "child-module-1",
					},
				},
				Address: "fake-module",
			},
		},
	}

	for _, tt := range tests {
		tt := tt

		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			filtered := onlyDataResources(*tt.stateMod)

			expected, err := json.Marshal(tt.expected)
			require.NoError(t, err)
			got, err := json.Marshal(filtered)
			require.NoError(t, err)

			require.Equal(t, string(expected), string(got))
		})
	}
}