package coderd

import (
	"database/sql"
	"errors"
	"net/http"
	"slices"

	"github.com/coder/coder/v2/coderd/database"
	"github.com/coder/coder/v2/coderd/database/dbtime"
	"github.com/coder/coder/v2/coderd/httpapi"
	"github.com/coder/coder/v2/coderd/httpmw"
	"github.com/coder/coder/v2/coderd/rbac"
	"github.com/coder/coder/v2/coderd/rbac/policy"
	"github.com/coder/coder/v2/codersdk"
)

// @Summary Create user webpush subscription
// @ID create-user-webpush-subscription
// @Security CoderSessionToken
// @Accept json
// @Tags Notifications
// @Param request body codersdk.WebpushSubscription true "Webpush subscription"
// @Param user path string true "User ID, name, or me"
// @Router /users/{user}/webpush/subscription [post]
// @Success 204
// @x-apidocgen {"skip": true}
func (api *API) postUserWebpushSubscription(rw http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	user := httpmw.UserParam(r)
	if !api.Experiments.Enabled(codersdk.ExperimentWebPush) {
		httpapi.ResourceNotFound(rw)
		return
	}

	var req codersdk.WebpushSubscription
	if !httpapi.Read(ctx, rw, r, &req) {
		return
	}

	if err := api.WebpushDispatcher.Test(ctx, req); err != nil {
		httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
			Message: "Failed to test webpush subscription",
			Detail:  err.Error(),
		})
		return
	}

	if _, err := api.Database.InsertWebpushSubscription(ctx, database.InsertWebpushSubscriptionParams{
		CreatedAt:         dbtime.Now(),
		UserID:            user.ID,
		Endpoint:          req.Endpoint,
		EndpointAuthKey:   req.AuthKey,
		EndpointP256dhKey: req.P256DHKey,
	}); err != nil {
		httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
			Message: "Failed to insert push notification subscription.",
			Detail:  err.Error(),
		})
		return
	}

	rw.WriteHeader(http.StatusNoContent)
}

// @Summary Delete user webpush subscription
// @ID delete-user-webpush-subscription
// @Security CoderSessionToken
// @Accept json
// @Tags Notifications
// @Param request body codersdk.DeleteWebpushSubscription true "Webpush subscription"
// @Param user path string true "User ID, name, or me"
// @Router /users/{user}/webpush/subscription [delete]
// @Success 204
// @x-apidocgen {"skip": true}
func (api *API) deleteUserWebpushSubscription(rw http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	user := httpmw.UserParam(r)

	if !api.Experiments.Enabled(codersdk.ExperimentWebPush) {
		httpapi.ResourceNotFound(rw)
		return
	}

	var req codersdk.DeleteWebpushSubscription
	if !httpapi.Read(ctx, rw, r, &req) {
		return
	}

	// Return NotFound if the subscription does not exist.
	if existing, err := api.Database.GetWebpushSubscriptionsByUserID(ctx, user.ID); err != nil && errors.Is(err, sql.ErrNoRows) {
		httpapi.Write(ctx, rw, http.StatusNotFound, codersdk.Response{
			Message: "Webpush subscription not found.",
		})
		return
	} else if idx := slices.IndexFunc(existing, func(s database.WebpushSubscription) bool {
		return s.Endpoint == req.Endpoint
	}); idx == -1 {
		httpapi.Write(ctx, rw, http.StatusNotFound, codersdk.Response{
			Message: "Webpush subscription not found.",
		})
		return
	}

	if err := api.Database.DeleteWebpushSubscriptionByUserIDAndEndpoint(ctx, database.DeleteWebpushSubscriptionByUserIDAndEndpointParams{
		UserID:   user.ID,
		Endpoint: req.Endpoint,
	}); err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			httpapi.Write(ctx, rw, http.StatusNotFound, codersdk.Response{
				Message: "Webpush subscription not found.",
			})
			return
		}
		httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
			Message: "Failed to delete push notification subscription.",
			Detail:  err.Error(),
		})
		return
	}

	rw.WriteHeader(http.StatusNoContent)
}

// @Summary Send a test push notification
// @ID send-a-test-push-notification
// @Security CoderSessionToken
// @Tags Notifications
// @Param user path string true "User ID, name, or me"
// @Success 204
// @Router /users/{user}/webpush/test [post]
// @x-apidocgen {"skip": true}
func (api *API) postUserPushNotificationTest(rw http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	user := httpmw.UserParam(r)

	if !api.Experiments.Enabled(codersdk.ExperimentWebPush) {
		httpapi.ResourceNotFound(rw)
		return
	}

	// We need to authorize the user to send a push notification to themselves.
	if !api.Authorize(r, policy.ActionCreate, rbac.ResourceNotificationMessage.WithOwner(user.ID.String())) {
		httpapi.Forbidden(rw)
		return
	}

	if err := api.WebpushDispatcher.Dispatch(ctx, user.ID, codersdk.WebpushMessage{
		Title: "It's working!",
		Body:  "You've subscribed to push notifications.",
	}); err != nil {
		httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
			Message: "Failed to send test notification",
			Detail:  err.Error(),
		})
		return
	}

	rw.WriteHeader(http.StatusNoContent)
}