//go:build linux

package terraform_test

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

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

	"cdr.dev/slog"
	"cdr.dev/slog/sloggers/slogtest"

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

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

	provider := `
terraform {
	required_providers {
		coder = {
			source = "coder/coder"
			version = "0.4.2"
		}
	}
}

provider "coder" {
}
	`
	t.Log(provider)

	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,
			},
			Logger: slogtest.Make(t, nil).Leveled(slog.LevelDebug),
		})
		assert.NoError(t, err)
	}()
	api := proto.NewDRPCProvisionerClient(provisionersdk.Conn(client))

	for _, testCase := range []struct {
		Name     string
		Files    map[string]string
		Request  *proto.Provision_Request
		Response *proto.Provision_Response
		Error    bool
	}{{
		Name: "single-variable",
		Files: map[string]string{
			"main.tf": `variable "A" {
				description = "Testing!"
			}`,
		},
		Request: &proto.Provision_Request{
			Type: &proto.Provision_Request_Start{
				Start: &proto.Provision_Start{
					ParameterValues: []*proto.ParameterValue{{
						DestinationScheme: proto.ParameterDestination_PROVISIONER_VARIABLE,
						Name:              "A",
						Value:             "example",
					}},
				},
			},
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{},
			},
		},
	}, {
		Name: "missing-variable",
		Files: map[string]string{
			"main.tf": `variable "A" {
			}`,
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Error: "exit status 1",
				},
			},
		},
	}, {
		Name: "single-resource",
		Files: map[string]string{
			"main.tf": `resource "null_resource" "A" {}`,
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Resources: []*proto.Resource{{
						Name: "A",
						Type: "null_resource",
					}},
				},
			},
		},
	}, {
		Name: "invalid-sourcecode",
		Files: map[string]string{
			"main.tf": `a`,
		},
		Error: true,
	}, {
		Name: "dryrun-single-resource",
		Files: map[string]string{
			"main.tf": `resource "null_resource" "A" {}`,
		},
		Request: &proto.Provision_Request{
			Type: &proto.Provision_Request_Start{
				Start: &proto.Provision_Start{
					DryRun: true,
				},
			},
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Resources: []*proto.Resource{{
						Name: "A",
						Type: "null_resource",
					}},
				},
			},
		},
	}, {
		Name: "dryrun-conditional-single-resource",
		Files: map[string]string{
			"main.tf": `
			variable "test" {
				default = "no"
			}
			resource "null_resource" "A" {
				count = var.test == "yes" ? 1 : 0
			}`,
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Resources: nil,
				},
			},
		},
	}, {
		Name: "resource-associated-with-agent",
		Files: map[string]string{
			"main.tf": provider + `
			resource "coder_agent" "A" {
				os = "windows"
				arch = "arm64"
				dir = "C:\\System32"
			}
			resource "null_resource" "A" {
				depends_on = [
					coder_agent.A
				]
			}`,
		},
		Request: &proto.Provision_Request{
			Type: &proto.Provision_Request_Start{
				Start: &proto.Provision_Start{
					Metadata: &proto.Provision_Metadata{},
				},
			},
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Resources: []*proto.Resource{{
						Name: "A",
						Type: "null_resource",
						Agents: []*proto.Agent{{
							Name:            "A",
							OperatingSystem: "windows",
							Architecture:    "arm64",
							Directory:       "C:\\System32",
							Auth: &proto.Agent_Token{
								Token: "",
							},
						}},
					}},
				},
			},
		},
	}, {
		Name: "dryrun-resource-associated-with-agent",
		Files: map[string]string{
			"main.tf": provider + `
			data "coder_workspace" "me" {}
			resource "coder_agent" "A" {
				count = 1
				os = "linux"
				arch = "amd64"
				env = {
					test: "example"
				}
				startup_script = "code-server"
			}
			resource "null_resource" "A" {
				depends_on = [
					coder_agent.A[0]
				]
				count = data.coder_workspace.me.start_count
			}`,
		},
		Request: &proto.Provision_Request{
			Type: &proto.Provision_Request_Start{
				Start: &proto.Provision_Start{
					DryRun:   true,
					Metadata: &proto.Provision_Metadata{},
				},
			},
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Resources: []*proto.Resource{{
						Name: "A",
						Type: "null_resource",
						Agents: []*proto.Agent{{
							Name:            "A",
							OperatingSystem: "linux",
							Architecture:    "amd64",
							Auth:            &proto.Agent_Token{},
							Env: map[string]string{
								"test": "example",
							},
							StartupScript: "code-server",
						}},
					}},
				},
			},
		},
	}, {
		Name: "resource-manually-associated-with-agent",
		Files: map[string]string{
			"main.tf": provider + `
			resource "coder_agent" "A" {
				os = "darwin"
				arch = "amd64"
			}
			resource "null_resource" "A" {
				depends_on = [
					coder_agent.A
				]
			}
			resource "coder_agent_instance" "A" {
				agent_id = coder_agent.A.id
				instance_id = "bananas"
			}
			`,
		},
		Request: &proto.Provision_Request{
			Type: &proto.Provision_Request_Start{
				Start: &proto.Provision_Start{
					Metadata: &proto.Provision_Metadata{},
				},
			},
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Resources: []*proto.Resource{{
						Name: "A",
						Type: "null_resource",
						Agents: []*proto.Agent{{
							Name:            "A",
							OperatingSystem: "darwin",
							Architecture:    "amd64",
							Auth: &proto.Agent_InstanceId{
								InstanceId: "bananas",
							},
						}},
					}},
				},
			},
		},
	}, {
		Name: "resource-manually-associated-with-multiple-agents",
		Files: map[string]string{
			"main.tf": provider + `
			resource "coder_agent" "A" {
				os = "darwin"
				arch = "amd64"
			}
			resource "coder_agent" "B" {
				os = "linux"
				arch = "amd64"
			}
			resource "null_resource" "A" {
				depends_on = [
					coder_agent.A,
					coder_agent.B
				]
			}
			resource "coder_agent_instance" "A" {
				agent_id = coder_agent.A.id
				instance_id = "bananas"
			}
			`,
		},
		Request: &proto.Provision_Request{
			Type: &proto.Provision_Request_Start{
				Start: &proto.Provision_Start{
					Metadata: &proto.Provision_Metadata{},
				},
			},
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Resources: []*proto.Resource{{
						Name: "A",
						Type: "null_resource",
						Agents: []*proto.Agent{{
							Name:            "A",
							OperatingSystem: "darwin",
							Architecture:    "amd64",
							Auth: &proto.Agent_InstanceId{
								InstanceId: "bananas",
							},
						}, {
							Name:            "B",
							OperatingSystem: "linux",
							Architecture:    "amd64",
							Auth: &proto.Agent_Token{
								Token: "",
							},
						}},
					}},
				},
			},
		},
	}, {
		Name: "dryrun-resource-separated-from-agent",
		Files: map[string]string{
			"main.tf": provider + `
			resource "coder_agent" "A" {
				os = "darwin"
				arch = "amd64"
			}
			data "null_data_source" "values" {
				inputs = {
					script = coder_agent.A.init_script
				}
			}
			resource "null_resource" "A" {
				depends_on = [
					data.null_data_source.values
				]
			}
			`,
		},
		Request: &proto.Provision_Request{
			Type: &proto.Provision_Request_Start{
				Start: &proto.Provision_Start{
					Metadata: &proto.Provision_Metadata{},
					DryRun:   true,
				},
			},
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Resources: []*proto.Resource{{
						Name: "A",
						Type: "null_resource",
						Agents: []*proto.Agent{{
							Name:            "A",
							OperatingSystem: "darwin",
							Architecture:    "amd64",
							Auth:            &proto.Agent_Token{},
						}},
					}},
				},
			},
		},
	}, {
		Name: "resource-separated-from-agent",
		Files: map[string]string{
			"main.tf": provider + `
			resource "coder_agent" "A" {
				os = "darwin"
				arch = "amd64"
			}
			data "null_data_source" "values" {
				inputs = {
					script = coder_agent.A.init_script
				}
			}
			resource "null_resource" "A" {
				depends_on = [
					data.null_data_source.values
				]
			}
			`,
		},
		Request: &proto.Provision_Request{
			Type: &proto.Provision_Request_Start{
				Start: &proto.Provision_Start{
					Metadata: &proto.Provision_Metadata{},
				},
			},
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Resources: []*proto.Resource{{
						Name: "A",
						Type: "null_resource",
						Agents: []*proto.Agent{{
							Name:            "A",
							OperatingSystem: "darwin",
							Architecture:    "amd64",
							Auth:            &proto.Agent_Token{},
						}},
					}},
				},
			},
		},
	}, {
		Name: "agent-with-app",
		Files: map[string]string{
			"main.tf": provider + `
			resource "coder_agent" "A" {
				os = "darwin"
				arch = "amd64"
			}
			resource "null_resource" "A" {
				depends_on = [
					coder_agent.A
				]
			}
			resource "coder_app" "A" {
				agent_id = coder_agent.A.id
				command = "vim"
			}
			`,
		},
		Request: &proto.Provision_Request{
			Type: &proto.Provision_Request_Start{
				Start: &proto.Provision_Start{
					Metadata: &proto.Provision_Metadata{},
				},
			},
		},
		Response: &proto.Provision_Response{
			Type: &proto.Provision_Response_Complete{
				Complete: &proto.Provision_Complete{
					Resources: []*proto.Resource{{
						Name: "A",
						Type: "null_resource",
						Agents: []*proto.Agent{{
							Name:            "A",
							OperatingSystem: "darwin",
							Architecture:    "amd64",
							Auth:            &proto.Agent_Token{},
							Apps: []*proto.App{{
								Name:    "A",
								Command: "vim",
							}},
						}},
					}},
				},
			},
		},
	}} {
		testCase := testCase
		t.Run(testCase.Name, func(t *testing.T) {
			t.Parallel()

			directory := t.TempDir()
			for path, content := range testCase.Files {
				err := os.WriteFile(filepath.Join(directory, path), []byte(content), 0600)
				require.NoError(t, err)
			}

			request := &proto.Provision_Request{
				Type: &proto.Provision_Request_Start{
					Start: &proto.Provision_Start{
						Directory: directory,
					},
				},
			}
			if testCase.Request != nil {
				request.GetStart().ParameterValues = testCase.Request.GetStart().ParameterValues
				request.GetStart().State = testCase.Request.GetStart().State
				request.GetStart().DryRun = testCase.Request.GetStart().DryRun
				request.GetStart().Metadata = testCase.Request.GetStart().Metadata
			}
			if request.GetStart().Metadata == nil {
				request.GetStart().Metadata = &proto.Provision_Metadata{}
			}
			response, err := api.Provision(ctx)
			require.NoError(t, err)
			err = response.Send(request)
			require.NoError(t, err)
			for {
				msg, err := response.Recv()
				if msg != nil && msg.GetLog() != nil {
					t.Logf("log: [%s] %s", msg.GetLog().Level, msg.GetLog().Output)
					continue
				}
				if testCase.Error {
					require.Error(t, err)
					return
				}
				require.NoError(t, err)

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

				require.NoError(t, err)

				// Remove randomly generated data.
				for _, resource := range msg.GetComplete().Resources {
					sort.Slice(resource.Agents, func(i, j int) bool {
						return resource.Agents[i].Name < resource.Agents[j].Name
					})

					for _, agent := range resource.Agents {
						agent.Id = ""
						if agent.GetToken() == "" {
							continue
						}
						agent.Auth = &proto.Agent_Token{}
					}
				}

				resourcesGot, err := json.Marshal(msg.GetComplete().Resources)
				require.NoError(t, err)

				resourcesWant, err := json.Marshal(testCase.Response.GetComplete().Resources)
				require.NoError(t, err)

				require.Equal(t, testCase.Response.GetComplete().Error, msg.GetComplete().Error)

				require.Equal(t, string(resourcesWant), string(resourcesGot))
				break
			}
		})
	}

	t.Run("DestroyNoState", func(t *testing.T) {
		t.Parallel()

		const template = `resource "null_resource" "A" {}`

		directory := t.TempDir()
		err := os.WriteFile(filepath.Join(directory, "main.tf"), []byte(template), 0600)
		require.NoError(t, err)

		request := &proto.Provision_Request{
			Type: &proto.Provision_Request_Start{
				Start: &proto.Provision_Start{
					State:     nil,
					Directory: directory,
					Metadata: &proto.Provision_Metadata{
						WorkspaceTransition: proto.WorkspaceTransition_DESTROY,
					},
				},
			},
		}

		response, err := api.Provision(ctx)
		require.NoError(t, err)
		err = response.Send(request)
		require.NoError(t, err)

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

			if msg.GetLog() != nil && strings.Contains(msg.GetLog().Output, "nothing to do") {
				gotLog = true
				continue
			}
			if msg.GetComplete() == nil {
				continue
			}

			require.Empty(t, msg.GetComplete().Error)
			require.True(t, gotLog, "never received 'nothing to do' log")
			break
		}
	})
}