package porter_app

import (
	"net/http"

	"connectrpc.com/connect"
	porterv1 "github.com/porter-dev/api-contracts/generated/go/porter/v1"
	"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/porter_app"
	"github.com/porter-dev/porter/internal/telemetry"
)

// GetAppRevisionHandler handles requests to the /apps/{porter_app_name}/revisions/{app_revision_id} endpoint
type GetAppRevisionHandler struct {
	handlers.PorterHandlerReadWriter
	authz.KubernetesAgentGetter
}

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

// GetAppRevisionResponse represents the response from the /apps/{porter_app_name}/revisions/{app_revision_id} endpoint
type GetAppRevisionResponse struct {
	AppRevision porter_app.Revision `json:"app_revision"`
}

// GetAppRevisionHandler returns a single app revision
func (c *GetAppRevisionHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	ctx, span := telemetry.NewSpan(r.Context(), "serve-get-app-revision")
	defer span.End()

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

	appRevisionID, reqErr := requestutils.GetURLParamString(r, types.URLParamAppRevisionID)
	if reqErr != nil {
		err := telemetry.Error(ctx, span, nil, "error parsing app revision id")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusBadRequest))
		return
	}

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

	getRevisionReq := connect.NewRequest(&porterv1.GetAppRevisionRequest{
		ProjectId:     int64(project.ID),
		AppRevisionId: appRevisionID,
	})
	ccpResp, err := c.Config().ClusterControlPlaneClient.GetAppRevision(ctx, getRevisionReq)
	if err != nil {
		err = telemetry.Error(ctx, span, err, "error getting app revision")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
		return
	}

	if ccpResp == nil || ccpResp.Msg == nil {
		err = telemetry.Error(ctx, span, nil, "get app revision response is nil")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
		return
	}

	encodedRevision, err := porter_app.EncodedRevisionFromProto(ctx, ccpResp.Msg.AppRevision)
	if err != nil {
		err := telemetry.Error(ctx, span, err, "error getting encoded revision from proto")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
		return
	}

	deploymentTarget, err := deployment_target.DeploymentTargetDetails(ctx, deployment_target.DeploymentTargetDetailsInput{
		ProjectID:          int64(project.ID),
		ClusterID:          int64(cluster.ID),
		DeploymentTargetID: ccpResp.Msg.AppRevision.DeploymentTargetId,
		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
	}

	revisionWithEnv, err := porter_app.AttachEnvToRevision(ctx, porter_app.AttachEnvToRevisionInput{
		ProjectID:           project.ID,
		ClusterID:           int(cluster.ID),
		Revision:            encodedRevision,
		DeploymentTarget:    deploymentTarget,
		K8SAgent:            agent,
		PorterAppRepository: c.Repo().PorterApp(),
	})
	if err != nil {
		err := telemetry.Error(ctx, span, err, "error attaching env to revision")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
		return
	}

	res := &GetAppRevisionResponse{
		AppRevision: revisionWithEnv,
	}

	c.WriteResult(w, r, res)
}