package environment

import (
	"context"
	"errors"
	"fmt"
	"net/http"
	"strings"

	"github.com/google/go-github/v41/github"
	"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/models"
	"gorm.io/gorm"
)

type DeleteDeploymentHandler struct {
	handlers.PorterHandlerReadWriter
	authz.KubernetesAgentGetter
}

func NewDeleteDeploymentHandler(
	config *config.Config,
	decoderValidator shared.RequestDecoderValidator,
	writer shared.ResultWriter,
) *DeleteDeploymentHandler {
	return &DeleteDeploymentHandler{
		PorterHandlerReadWriter: handlers.NewDefaultPorterHandler(config, decoderValidator, writer),
		KubernetesAgentGetter:   authz.NewOutOfClusterAgentGetter(config),
	}
}

func (c *DeleteDeploymentHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	project, _ := r.Context().Value(types.ProjectScope).(*models.Project)
	cluster, _ := r.Context().Value(types.ClusterScope).(*models.Cluster)

	deplID, reqErr := requestutils.GetURLParamUint(r, "deployment_id")

	if reqErr != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(reqErr))
		return
	}

	// read the deployment
	depl, err := c.Repo().Environment().ReadDeploymentByID(project.ID, cluster.ID, deplID)

	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(err))
		return
	}

	// delete corresponding namespace
	agent, err := c.GetAgent(r, cluster, "")

	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(err))
		return
	}

	// make sure we don't delete default or kube-system by checking for prefix, for now
	if strings.Contains(depl.Namespace, "pr-") {
		err = agent.DeleteNamespace(depl.Namespace)

		if err != nil {
			c.HandleAPIError(w, r, apierrors.NewErrInternal(err))
			return
		}
	}

	// check that the environment belongs to the project and cluster IDs
	env, err := c.Repo().Environment().ReadEnvironmentByID(project.ID, cluster.ID, depl.EnvironmentID)

	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			c.HandleAPIError(w, r, apierrors.NewErrForbidden(fmt.Errorf("environment id not found in cluster and project")))
			return
		}

		c.HandleAPIError(w, r, apierrors.NewErrInternal(reqErr))
		return
	}

	client, err := getGithubClientFromEnvironment(c.Config(), env)

	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(err))
		return
	}

	// Create new deployment status to indicate deployment is ready
	state := "inactive"

	deploymentStatusRequest := github.DeploymentStatusRequest{
		State: &state,
	}

	_, _, err = client.Repositories.CreateDeploymentStatus(
		context.Background(),
		env.GitRepoOwner,
		env.GitRepoName,
		depl.GHDeploymentID,
		&deploymentStatusRequest,
	)

	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(err))
		return
	}

	depl.Status = types.DeploymentStatusInactive

	// update the deployment to mark it inactive
	depl, err = c.Repo().Environment().UpdateDeployment(depl)

	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(err))
		return
	}

	c.WriteResult(w, r, depl.ToDeploymentType())
}