package porter_app

import (
	"fmt"
	"net/http"

	"github.com/porter-dev/porter/api/server/authz"
	"github.com/porter-dev/porter/api/server/handlers"
	"github.com/porter-dev/porter/api/server/shared"
	"github.com/porter-dev/porter/api/server/shared/apierrors"
	"github.com/porter-dev/porter/api/server/shared/config"
	"github.com/porter-dev/porter/api/server/shared/requestutils"
	"github.com/porter-dev/porter/api/types"
	"github.com/porter-dev/porter/internal/deployment_target"
	"github.com/porter-dev/porter/internal/models"
	"github.com/porter-dev/porter/internal/telemetry"
	v1 "k8s.io/api/core/v1"
)

// PodStatusHandler is the handler for GET /apps/pods
type PodStatusHandler struct {
	handlers.PorterHandlerReadWriter
	authz.KubernetesAgentGetter
}

// NewPodStatusHandler returns a new PodStatusHandler
func NewPodStatusHandler(
	config *config.Config,
	decoderValidator shared.RequestDecoderValidator,
	writer shared.ResultWriter,
) *PodStatusHandler {
	return &PodStatusHandler{
		PorterHandlerReadWriter: handlers.NewDefaultPorterHandler(config, decoderValidator, writer),
		KubernetesAgentGetter:   authz.NewOutOfClusterAgentGetter(config),
	}
}

// PodStatusRequest is the expected format for a request body on GET /apps/pods
type PodStatusRequest struct {
	DeploymentTargetName string `schema:"deployment_target_name"`
	DeploymentTargetID   string `schema:"deployment_target_id"`
	ServiceName          string `schema:"service"`
}

func (c *PodStatusHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	ctx, span := telemetry.NewSpan(r.Context(), "serve-pod-status")
	defer span.End()

	request := &PodStatusRequest{}
	if ok := c.DecodeAndValidate(w, r, request); !ok {
		err := telemetry.Error(ctx, span, nil, "invalid request")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusBadRequest))
		return
	}

	appName, reqErr := requestutils.GetURLParamString(r, types.URLParamPorterAppName)
	if reqErr != nil {
		err := telemetry.Error(ctx, span, reqErr, "porter app name not found in request")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusBadRequest))
		return
	}

	cluster, _ := r.Context().Value(types.ClusterScope).(*models.Cluster)
	project, _ := r.Context().Value(types.ProjectScope).(*models.Project)

	telemetry.WithAttributes(span,
		telemetry.AttributeKV{Key: "service-name", Value: request.ServiceName},
		telemetry.AttributeKV{Key: "app-name", Value: appName},
		telemetry.AttributeKV{Key: "input-deployment-target-id", Value: request.DeploymentTargetID},
		telemetry.AttributeKV{Key: "input-deployment-target-name", Value: request.DeploymentTargetName},
	)

	deploymentTargetName := request.DeploymentTargetName
	if request.DeploymentTargetName == "" && request.DeploymentTargetID == "" {
		defaultDeploymentTarget, err := defaultDeploymentTarget(ctx, defaultDeploymentTargetInput{
			ProjectID:                 project.ID,
			ClusterID:                 cluster.ID,
			ClusterControlPlaneClient: c.Config().ClusterControlPlaneClient,
		})
		if err != nil {
			err := telemetry.Error(ctx, span, err, "error getting default deployment target")
			c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
			return
		}
		deploymentTargetName = defaultDeploymentTarget.Name
	}

	telemetry.WithAttributes(span,
		telemetry.AttributeKV{Key: "deployment-target-id", Value: request.DeploymentTargetID},
		telemetry.AttributeKV{Key: "deployment-target-name", Value: request.DeploymentTargetName},
	)

	deploymentTarget, err := deployment_target.DeploymentTargetDetails(ctx, deployment_target.DeploymentTargetDetailsInput{
		ProjectID:            int64(project.ID),
		ClusterID:            int64(cluster.ID),
		DeploymentTargetID:   request.DeploymentTargetID,
		DeploymentTargetName: deploymentTargetName,
		CCPClient:            c.Config().ClusterControlPlaneClient,
	})
	if err != nil {
		err := telemetry.Error(ctx, span, err, "error getting deployment target details")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
		return
	}

	namespace := deploymentTarget.Namespace
	telemetry.WithAttributes(span,
		telemetry.AttributeKV{Key: "namespace", Value: namespace},
		telemetry.AttributeKV{Key: "deployment-target-id", Value: deploymentTarget.ID},
	)

	agent, err := c.GetAgent(r, cluster, "")
	if err != nil {
		err = telemetry.Error(ctx, span, err, "unable to get agent")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
		return
	}

	pods := []v1.Pod{}

	var selectors string
	if request.ServiceName == "" {
		selectors = fmt.Sprintf("porter.run/deployment-target-id=%s,porter.run/app-name=%s", deploymentTarget.ID, appName)
	} else {
		selectors = fmt.Sprintf("porter.run/service-name=%s,porter.run/deployment-target-id=%s,porter.run/app-name=%s", deploymentTarget.ID, request.DeploymentTargetID, appName)
	}
	podsList, err := agent.GetPodsByLabel(selectors, namespace)
	if err != nil {
		err = telemetry.Error(ctx, span, err, "unable to get pods by label")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
		return
	}

	pods = append(pods, podsList.Items...)

	c.WriteResult(w, r, pods)
}