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package main

type Service struct {
	Db Database
}

type EntryPage struct {
	Task *Task
	Detached bool
	Tracking *Task
}

type RootPage struct {
	Entry *EntryPage
	Tasks []*Task
}

func NewService(db Database) *Service {
	return &Service {
		Db: db,
	}
}

func (srv *Service) GetEntryPage(detached *Task) (*EntryPage, error) {
	tracking, err := srv.Db.GetTracking()
	if err != nil {
		return nil, err
	}
	
	page := &EntryPage {
		Task: tracking,
		Detached: false,
		Tracking: tracking,
	}

	if detached != nil {
		page.Task = detached
		page.Detached = true
	}


	return page, nil
}

func (srv *Service) GetRootPage() (*RootPage, error) {
	entry, err := srv.GetEntryPage(nil)
	if err != nil {
		return nil, err
	}
	tasks, err := srv.Db.GetTasks()
	if err != nil {
		return nil, err
	}

	return &RootPage {
		Entry: entry,
		Tasks: tasks,
	}, nil
}