package database

import (
	"time"

	"git.phc.dm.unipi.it/phc/cluster-dashboard/backend/executor"
	"git.phc.dm.unipi.it/phc/cluster-dashboard/backend/model"
	"golang.org/x/exp/maps"
)

// simpleDB è una implementazione di [database.Database] che tiene giusto una cache in memoria e
// quando il server viene riavviato perde tutte le statistiche che ha accumulato. Più avanti si
// potrebbe pensare di scrivere queste informazioni in un file o usare un vero database.
type simpleDB struct {
	Executor executor.Service

	// lastUpdate tiene traccia di quando abbiamo aggiornato l'ultima volta tutti i dati
	lastUpdate *time.Time

	// Nodes is a map from hostname to node info
	nodes map[string]*model.Node

	// Jobs is a map from job id to job info
	jobs map[string]*model.Job

	// The following are maps from hostname to a list of sampled temperatures, used memory, used storage space and network upload and download rate.

	temperatureSamples     map[string][]model.Sample[float64]
	memorySamples          map[string][]model.Sample[int64]
	storageSamples         map[string][]model.Sample[int64]
	networkUploadSamples   map[string][]model.Sample[int64]
	networkDownloadSamples map[string][]model.Sample[int64]
}

func NewSimpleDatabase(ex executor.Service) Database {
	return &simpleDB{Executor: ex}
}

func (s *simpleDB) GetNode(hostname string) (*model.Node, error) {
	panic("todo")
}

func (s *simpleDB) GetJob(id string) (*model.Job, error) {
	panic("todo")
}

func (s *simpleDB) AllNodes() ([]*model.Node, error) {
	return maps.Values(s.nodes), nil
}

func (s *simpleDB) AllJobs() ([]*model.Job, error) {
	return maps.Values(s.jobs), nil
}

func (s *simpleDB) QueryTemperatureSamples(from, to time.Time) ([]model.Sample[float64], error) {
	panic("todo")
}

func (s *simpleDB) QueryMemorySamples(from, to time.Time) ([]model.Sample[int64], error) {
	panic("todo")
}

func (s *simpleDB) QueryStorageSamples(from, to time.Time) ([]model.Sample[int64], error) {
	panic("todo")
}

func (s *simpleDB) QueryNetworkUploadSamples(from, to time.Time) ([]model.Sample[int64], error) {
	panic("todo")
}

func (s *simpleDB) QueryNetworkDownloadSamples(from, to time.Time) ([]model.Sample[int64], error) {
	panic("todo")
}