package command

import (
	"context"
	"github.com/caos/zitadel/internal/eventstore/v2"
	"github.com/caos/zitadel/internal/v2/domain"
	"github.com/caos/zitadel/internal/v2/repository/project"
)

type ProjectWriteModel struct {
	eventstore.WriteModel

	Name                 string
	ProjectRoleAssertion bool
	ProjectRoleCheck     bool
	State                domain.ProjectState
}

func NewProjectWriteModel(projectID string, resourceOwner string) *ProjectWriteModel {
	return &ProjectWriteModel{
		WriteModel: eventstore.WriteModel{
			AggregateID:   projectID,
			ResourceOwner: resourceOwner,
		},
	}
}

func (wm *ProjectWriteModel) AppendEvents(events ...eventstore.EventReader) {
	wm.WriteModel.AppendEvents(events...)
}

func (wm *ProjectWriteModel) Reduce() error {
	for _, event := range wm.Events {
		switch e := event.(type) {
		case *project.ProjectAddedEvent:
			wm.Name = e.Name
			wm.ProjectRoleAssertion = e.ProjectRoleAssertion
			wm.ProjectRoleCheck = e.ProjectRoleCheck
			wm.State = domain.ProjectStateActive
		case *project.ProjectChangeEvent:
			if e.Name != nil {
				wm.Name = *e.Name
			}
			if e.ProjectRoleAssertion != nil {
				wm.ProjectRoleAssertion = *e.ProjectRoleAssertion
			}
			if e.ProjectRoleCheck != nil {
				wm.ProjectRoleCheck = *e.ProjectRoleCheck
			}
		case *project.ProjectDeactivatedEvent:
			if wm.State == domain.ProjectStateRemoved {
				continue
			}
			wm.State = domain.ProjectStateInactive
		case *project.ProjectReactivatedEvent:
			if wm.State == domain.ProjectStateRemoved {
				continue
			}
			wm.State = domain.ProjectStateActive
		case *project.ProjectRemovedEvent:
			wm.State = domain.ProjectStateRemoved
		}
	}
	return wm.WriteModel.Reduce()
}

func (wm *ProjectWriteModel) Query() *eventstore.SearchQueryBuilder {
	return eventstore.NewSearchQueryBuilder(eventstore.ColumnsEvent, project.AggregateType).
		AggregateIDs(wm.AggregateID).
		ResourceOwner(wm.ResourceOwner)
}

func (wm *ProjectWriteModel) NewChangedEvent(
	ctx context.Context,
	name string,
	projectRoleAssertion,
	projectRoleCheck bool,
) (*project.ProjectChangeEvent, bool, error) {
	changes := make([]project.ProjectChanges, 0)
	var err error

	if wm.Name != name {
		changes = append(changes, project.ChangeName(name))
	}
	if wm.ProjectRoleAssertion != projectRoleAssertion {
		changes = append(changes, project.ChangeProjectRoleAssertion(projectRoleAssertion))
	}
	if wm.ProjectRoleCheck != projectRoleCheck {
		changes = append(changes, project.ChangeProjectRoleCheck(projectRoleCheck))
	}
	if len(changes) == 0 {
		return nil, false, nil
	}
	changeEvent, err := project.NewProjectChangeEvent(ctx, changes)
	if err != nil {
		return nil, false, err
	}
	return changeEvent, true, nil
}

func ProjectAggregateFromWriteModel(wm *eventstore.WriteModel) *project.Aggregate {
	return &project.Aggregate{
		Aggregate: *eventstore.AggregateFromWriteModel(wm, project.AggregateType, project.AggregateVersion),
	}
}