package capabilities

import (
	"strings"

	permission "gitlab.com/mbugroup/lti-api.git/internal/middleware"
)

// FromPermissions returns a filtered map of capabilities that the frontend can use
// to toggle features. Only permissions recognized by the application are exposed.
func FromPermissions(perms []string) map[string]bool {
	if len(perms) == 0 {
		return nil
	}

	out := make(map[string]bool)
	for _, perm := range perms {
		if key, ok := normalizeAndAllow(perm); ok {
			out[key] = true
		}
	}
	if len(out) == 0 {
		return nil
	}
	return out
}

func normalizeAndAllow(perm string) (string, bool) {
	perm = strings.ToLower(strings.TrimSpace(perm))
	if perm == "" {
		return "", false
	}
	if _, ok := allowed[perm]; !ok {
		return "", false
	}
	return perm, true
}

var allowed = map[string]struct{}{
	permission.PermissionRecordingRead:   {},
	permission.PermissionRecordingCreate: {},
	permission.PermissionRecordingUpdate: {},
	permission.PermissionRecordingDelete: {},
}