package spec

import (
	"encoding/json"
	"fmt"
	"net/url"
	"strings"

	"github.com/cloudbase/garm-provider-common/params"
	corev1 "k8s.io/api/core/v1"
)

type GitHubScopeDetails struct {
	BaseURL    string
	Repo       string
	Org        string
	Enterprise string
}

type RunnerExtraSpecs struct {
	RunnerWorkDir       string          `json:"runner_workdir"`
	DisableRunnerUpdate *bool           `json:"disable_runner_update"`
	RunnerEphemeral     *bool           `json:"runner_ephemeral"`
	PodSpec             *corev1.PodSpec `json:"pod_spec,omitempty"`
}

func ExtractGitHubScopeDetails(gitRepoURL string) (GitHubScopeDetails, error) {
	if gitRepoURL == "" {
		return GitHubScopeDetails{}, fmt.Errorf("no gitRepoURL supplied")
	}
	u, err := url.Parse(gitRepoURL)
	if err != nil {
		return GitHubScopeDetails{}, fmt.Errorf("invalid URL: %w", err)
	}

	if u.Scheme == "" || u.Host == "" {
		return GitHubScopeDetails{}, fmt.Errorf("invalid URL: %s", gitRepoURL)
	}

	pathParts := strings.Split(strings.Trim(u.Path, "/"), "/")

	scope := GitHubScopeDetails{
		BaseURL: u.Scheme + "://" + u.Host,
	}

	switch {
	case len(pathParts) == 1:
		scope.Org = pathParts[0]
	case len(pathParts) == 2 && pathParts[0] == "enterprises":
		scope.Enterprise = pathParts[1]
	case len(pathParts) == 2:
		scope.Org = pathParts[0]
		scope.Repo = pathParts[1]
	default:
		return GitHubScopeDetails{}, fmt.Errorf("URL does not match the expected patterns")
	}

	return scope, nil
}

func ParseExtraSpecs(bootstrapParams params.BootstrapInstance) RunnerExtraSpecs {
	var extraSpecs RunnerExtraSpecs
	if len(bootstrapParams.ExtraSpecs) > 0 {
		_ = json.Unmarshal(bootstrapParams.ExtraSpecs, &extraSpecs)
	}
	return extraSpecs
}

func GetRunnerEnvs(gitHubScope GitHubScopeDetails, bootstrapParams params.BootstrapInstance) []corev1.EnvVar {
	extraSpecs := ParseExtraSpecs(bootstrapParams)

	runnerWorkDir := extraSpecs.RunnerWorkDir
	if runnerWorkDir == "" {
		runnerWorkDir = "/runner/_work/"
	}

	disableRunnerUpdate := "true"
	if extraSpecs.DisableRunnerUpdate != nil {
		disableRunnerUpdate = fmt.Sprintf("%t", *extraSpecs.DisableRunnerUpdate)
	}

	runnerEphemeral := "true"
	if extraSpecs.RunnerEphemeral != nil {
		runnerEphemeral = fmt.Sprintf("%t", *extraSpecs.RunnerEphemeral)
	}

	return []corev1.EnvVar{
		{
			Name:  "RUNNER_GITEA_INSTANCE",
			Value: bootstrapParams.RepoURL,
		},
		{
			Name:  "RUNNER_GROUP",
			Value: bootstrapParams.GitHubRunnerGroup,
		},
		{
			Name:  "RUNNER_NAME",
			Value: bootstrapParams.Name,
		},
		{
			Name:  "RUNNER_LABELS",
			Value: strings.Join(bootstrapParams.Labels, ","),
		},
		{
			Name:  "RUNNER_NO_DEFAULT_LABELS",
			Value: "true",
		},
		{
			Name:  "DISABLE_RUNNER_UPDATE",
			Value: disableRunnerUpdate,
		},
		{
			Name:  "RUNNER_WORKDIR",
			Value: runnerWorkDir,
		},
		{
			Name:  "GITHUB_URL",
			Value: gitHubScope.BaseURL,
		},
		{
			Name:  "RUNNER_EPHEMERAL",
			Value: runnerEphemeral,
		},
		{
			Name:  "RUNNER_TOKEN",
			Value: "dummy",
		},
		{
			Name:  "METADATA_URL",
			Value: bootstrapParams.MetadataURL,
		},
		{
			Name:  "BEARER_TOKEN",
			Value: bootstrapParams.InstanceToken,
		},
		{
			Name:  "CALLBACK_URL",
			Value: bootstrapParams.CallbackURL,
		},
		{
			Name:  "JIT_CONFIG_ENABLED",
			Value: fmt.Sprintf("%t", bootstrapParams.JitConfigEnabled),
		},
	}
}

func GetPodSpec(gitHubScope GitHubScopeDetails, bootstrapParams params.BootstrapInstance) corev1.PodSpec {
	extraSpecs := ParseExtraSpecs(bootstrapParams)

	if extraSpecs.PodSpec != nil {
		return *extraSpecs.PodSpec
	}

	envs := GetRunnerEnvs(gitHubScope, bootstrapParams)

	return corev1.PodSpec{
		RestartPolicy: corev1.RestartPolicyAlways,
		Containers: []corev1.Container{
			{
				Name:            "runner",
				Image:           "edp.buildth.ing/devfw-cicd/garm-act-runner:1",
				ImagePullPolicy: "Always",
				Env:             envs,
				VolumeMounts: []corev1.VolumeMount{
					{
						Name:      "buildkitd",
						MountPath: "/run/user/1000/buildkit",
						SubPath:   "buildkitd.sock",
					},
				},
			},
			{
				Name:  "buildkitd",
				Image: "moby/buildkit:v0.25.1-rootless",
				Args: []string{
					"--allow-insecure-entitlement=network.host",
					"--oci-worker-no-process-sandbox",
				},
				ImagePullPolicy: corev1.PullIfNotPresent,
				ReadinessProbe: &corev1.Probe{
					ProbeHandler: corev1.ProbeHandler{
						Exec: &corev1.ExecAction{
							Command: []string{
								"buildctl",
								"debug",
								"workers",
							},
						},
					},
					FailureThreshold: 3,
					PeriodSeconds:    10,
					SuccessThreshold: 1,
					TimeoutSeconds:   1,
				},
				VolumeMounts: []corev1.VolumeMount{
					{
						Name:      "buildkitd",
						MountPath: "/run/user/1000/buildkit",
						SubPath:   "buildkitd.sock",
					},
				},
			},
		},
		Volumes: []corev1.Volume{
			{
				Name: "buildkitd",
				VolumeSource: corev1.VolumeSource{
					EmptyDir: &corev1.EmptyDirVolumeSource{},
				},
			},
		},
	}
}