package scimsync

import (
	"context"
	"fmt"
	"log/slog"
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/italypaleale/francis/actor"
	"github.com/italypaleale/francis/host/local"
	"gorm.io/gorm"

	"github.com/pocket-id/pocket-id/backend/internal/httpserver"
)

type Dependencies struct {
	DB         *gorm.DB
	Actors     *local.Host
	HTTPClient *http.Client

	// ScheduleDisabled keeps automatic synchronizations from being armed
	// It's set in the test environment, where SCIM syncs are driven explicitly by the end-to-end tests
	ScheduleDisabled bool
}

type Module struct {
	service          *Service
	handler          *handler
	actors           *actor.Service
	scheduleDisabled bool
}

func New(deps Dependencies) (*Module, error) {
	service := newService(deps.DB, deps.HTTPClient)

	// Register the singleton so recurring and debounced synchronizations run once for the entire cluster
	err := deps.Actors.RegisterSingletonActor(ActorType, NewActor(service, deps.ScheduleDisabled))
	if err != nil {
		return nil, fmt.Errorf("error registering the %s actor: %w", ActorType, err)
	}

	return &Module{
		service:          service,
		handler:          newHandler(service),
		actors:           deps.Actors.Service(),
		scheduleDisabled: deps.ScheduleDisabled,
	}, nil
}

// RegisterRoutes mounts the SCIM service provider endpoints
func (m *Module) RegisterRoutes(apiGroup *gin.RouterGroup, auth gin.HandlerFunc) {
	apiGroup.GET("/oidc/clients/:id/scim-service-provider", auth, httpserver.Handle(m.handler.getServiceProviderByClient))
	apiGroup.POST("/scim/service-provider", auth, httpserver.Handle(m.handler.createServiceProvider))
	apiGroup.POST("/scim/service-provider/:id/sync", auth, httpserver.Handle(m.handler.syncServiceProvider))
	apiGroup.PUT("/scim/service-provider/:id", auth, httpserver.Handle(m.handler.updateServiceProvider))
	apiGroup.DELETE("/scim/service-provider/:id", auth, httpserver.Handle(m.handler.deleteServiceProvider))
}

// ScheduleSync schedules a debounced cluster-wide synchronization after SCIM-relevant data changes
func (m *Module) ScheduleSync(ctx context.Context) {
	if m.scheduleDisabled {
		return
	}

	_, err := m.actors.Invoke(ctx, ActorType, actor.SingletonActorID, methodScheduleSync, nil)
	if err != nil {
		slog.ErrorContext(ctx, "Failed to schedule SCIM sync", slog.Any("error", err))
	}
}