Merge pull request juju#18445 from ycliuhw/model-status-refactor-clie…

…nt-facade

juju#18445

This PR replaces the model status Mongo state with the domain service and removes model status history code and raises a notimplemented error.

Driveby fix: add a missing clock in the domain model service.

## Checklist

- [x] Code style: imports ordered, good names, simple structure, etc
- [x] Comments saying why design decisions were made
- [x] Go unit tests, with comments saying what you're testing
- [ ] ~[Integration tests](https://github.com/juju/juju/tree/main/tests), with comments saying what you're testing~
- [ ] ~[doc.go](https://discourse.charmhub.io/t/readme-in-packages/451) added or updated in changed packages~

## QA steps

Unit tests (the state layer is not implemented yet).

## Documentation changes

No

## Links

**Jira card:** [JUJU-7102](https://warthogs.atlassian.net/browse/JUJU-7102)



[JUJU-7102]: https://warthogs.atlassian.net/browse/JUJU-7102?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

apiserver/facades/client/client/backend.go

@@ -10,7 +10,6 @@ import (
 	"github.com/juju/mgo/v3"
 	"github.com/juju/names/v5"
 	"github.com/juju/replicaset/v3"
-	"github.com/juju/version/v2"
 
 	"github.com/juju/juju/apiserver/common/storagecommon"
 	"github.com/juju/juju/core/crossmodel"
@@ -38,7 +37,6 @@ type Backend interface {
 	HAPrimaryMachine() (names.MachineTag, error)
 	LatestPlaceholderCharm(*charm.URL) (*state.Charm, error)
 	Machine(string) (*state.Machine, error)
-	Model() (Model, error)
 	ModelTag() names.ModelTag
 	ModelUUID() string
 	RemoteApplication(string) (*state.RemoteApplication, error)
@@ -51,21 +49,6 @@ type MongoSession interface {
 	CurrentStatus() (*replicaset.Status, error)
 }
 
-// Model contains the state.Model methods used in this package.
-type Model interface {
-	Name() string
-	Type() state.ModelType
-	UUID() string
-	Life() state.Life
-	CloudName() string
-	CloudRegion() string
-	CloudCredentialTag() (names.CloudCredentialTag, bool)
-	Owner() names.UserTag
-	StatusHistory(status.StatusHistoryFilter) ([]status.StatusInfo, error)
-	LatestToolsVersion() version.Number
-	Status() (status.StatusInfo, error)
-}
-
 // Application represents a state.Application.
 type Application interface {
 	StatusHistory(status.StatusHistoryFilter) ([]status.StatusInfo, error)
@@ -113,14 +96,6 @@ func (s stateShim) ModelTag() names.ModelTag {
 	return names.NewModelTag(s.State.ModelUUID())
 }
 
-func (s stateShim) Model() (Model, error) {
-	m, err := s.State.Model()
-	if err != nil {
-		return nil, errors.Trace(err)
-	}
-	return &modelShim{Model: m}, nil
-}
-
 func (s stateShim) ControllerNodes() ([]state.ControllerNode, error) {
 	nodes, err := s.State.ControllerNodes()
 	if err != nil {
@@ -140,10 +115,6 @@ func (s stateShim) MongoSession() MongoSession {
 	return MongoSessionShim{s.State.MongoSession()}
 }
 
-type modelShim struct {
-	*state.Model
-}
-
 // MongoSessionShim wraps a *mgo.Session to conform to the
 // MongoSession interface.
 type MongoSessionShim struct {