package resources

import (
	"context"
	"path"
	"strconv"
	"time"

	"github.com/zitadel/zitadel/internal/api/authz"
	"github.com/zitadel/zitadel/internal/api/http"
	"github.com/zitadel/zitadel/internal/api/scim/resources/patch"
	"github.com/zitadel/zitadel/internal/api/scim/schemas"
	"github.com/zitadel/zitadel/internal/domain"
)

type ResourceHandler[T ResourceHolder] interface {
	ResourceNameSingular() schemas.ScimResourceTypeSingular
	ResourceNamePlural() schemas.ScimResourceTypePlural
	SchemaType() schemas.ScimSchemaType
	NewResource() T

	Create(ctx context.Context, resource T) (T, error)
	Replace(ctx context.Context, id string, resource T) (T, error)
	Update(ctx context.Context, id string, operations patch.OperationCollection) error
	Delete(ctx context.Context, id string) error
	Get(ctx context.Context, id string) (T, error)
	List(ctx context.Context, request *ListRequest) (*ListResponse[T], error)
}

type Resource struct {
	Schemas []schemas.ScimSchemaType `json:"schemas"`
	Meta    *ResourceMeta            `json:"meta"`
}

type ResourceMeta struct {
	ResourceType schemas.ScimResourceTypeSingular `json:"resourceType"`
	Created      time.Time                        `json:"created"`
	LastModified time.Time                        `json:"lastModified"`
	Version      string                           `json:"version"`
	Location     string                           `json:"location"`
}

type ResourceHolder interface {
	GetResource() *Resource
}

func buildResource[T ResourceHolder](ctx context.Context, handler ResourceHandler[T], details *domain.ObjectDetails) *Resource {
	created := details.CreationDate.UTC()
	if created.IsZero() {
		created = details.EventDate.UTC()
	}

	return &Resource{
		Schemas: []schemas.ScimSchemaType{handler.SchemaType()},
		Meta: &ResourceMeta{
			ResourceType: handler.ResourceNameSingular(),
			Created:      created,
			LastModified: details.EventDate.UTC(),
			Version:      strconv.FormatUint(details.Sequence, 10),
			Location:     buildLocation(ctx, handler, details.ID),
		},
	}
}

func buildLocation[T ResourceHolder](ctx context.Context, handler ResourceHandler[T], id string) string {
	return http.DomainContext(ctx).Origin() + path.Join(schemas.HandlerPrefix, authz.GetCtxData(ctx).OrgID, string(handler.ResourceNamePlural()), id)
}