//go:build linux

package terraform_test

import (
	"context"
	"encoding/json"
	"os"
	"path/filepath"
	"testing"

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

	"github.com/coder/coder/provisioner/terraform"
	"github.com/coder/coder/provisionersdk"
	"github.com/coder/coder/provisionersdk/proto"
)

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

	// Create an in-memory provisioner to communicate with.
	client, server := provisionersdk.TransportPipe()
	ctx, cancelFunc := context.WithCancel(context.Background())
	t.Cleanup(func() {
		_ = client.Close()
		_ = server.Close()
		cancelFunc()
	})
	go func() {
		err := terraform.Serve(ctx, &terraform.ServeOptions{
			ServeOptions: &provisionersdk.ServeOptions{
				Listener: server,
			},
		})
		assert.NoError(t, err)
	}()
	api := proto.NewDRPCProvisionerClient(provisionersdk.Conn(client))

	for _, testCase := range []struct {
		Name     string
		Files    map[string]string
		Response *proto.Parse_Response
	}{{
		Name: "single-variable",
		Files: map[string]string{
			"main.tf": `variable "A" {
				description = "Testing!"
			}`,
		},
		Response: &proto.Parse_Response{
			Type: &proto.Parse_Response_Complete{
				Complete: &proto.Parse_Complete{
					ParameterSchemas: []*proto.ParameterSchema{{
						Name:                "A",
						RedisplayValue:      true,
						AllowOverrideSource: true,
						Description:         "Testing!",
						DefaultDestination: &proto.ParameterDestination{
							Scheme: proto.ParameterDestination_PROVISIONER_VARIABLE,
						},
					}},
				},
			},
		},
	}, {
		Name: "default-variable-value",
		Files: map[string]string{
			"main.tf": `variable "A" {
				default = "wow"
			}`,
		},
		Response: &proto.Parse_Response{
			Type: &proto.Parse_Response_Complete{
				Complete: &proto.Parse_Complete{
					ParameterSchemas: []*proto.ParameterSchema{{
						Name:                "A",
						RedisplayValue:      true,
						AllowOverrideSource: true,
						DefaultSource: &proto.ParameterSource{
							Scheme: proto.ParameterSource_DATA,
							Value:  "wow",
						},
						DefaultDestination: &proto.ParameterDestination{
							Scheme: proto.ParameterDestination_PROVISIONER_VARIABLE,
						},
					}},
				},
			},
		},
	}, {
		Name: "variable-validation",
		Files: map[string]string{
			"main.tf": `variable "A" {
				validation {
					condition = var.A == "value"
				}
			}`,
		},
		Response: &proto.Parse_Response{
			Type: &proto.Parse_Response_Complete{
				Complete: &proto.Parse_Complete{
					ParameterSchemas: []*proto.ParameterSchema{{
						Name:                 "A",
						RedisplayValue:       true,
						ValidationCondition:  `var.A == "value"`,
						ValidationTypeSystem: proto.ParameterSchema_HCL,
						AllowOverrideSource:  true,
						DefaultDestination: &proto.ParameterDestination{
							Scheme: proto.ParameterDestination_PROVISIONER_VARIABLE,
						},
					}},
				},
			},
		},
	}} {
		testCase := testCase
		t.Run(testCase.Name, func(t *testing.T) {
			t.Parallel()

			// Write all files to the temporary test directory.
			directory := t.TempDir()
			for path, content := range testCase.Files {
				err := os.WriteFile(filepath.Join(directory, path), []byte(content), 0600)
				require.NoError(t, err)
			}

			response, err := api.Parse(ctx, &proto.Parse_Request{
				Directory: directory,
			})
			require.NoError(t, err)

			for {
				msg, err := response.Recv()
				require.NoError(t, err)

				if msg.GetComplete() == nil {
					continue
				}

				// Ensure the want and got are equivalent!
				want, err := json.Marshal(testCase.Response)
				require.NoError(t, err)
				got, err := json.Marshal(msg)
				require.NoError(t, err)

				require.Equal(t, string(want), string(got))
				break
			}
		})
	}
}