package tsdb

// import (
// 	"errors"
// 	"fmt"
// 	"time"

// 	"github.com/fabxc/tsdb/index"
// 	"github.com/prometheus/common/model"
// 	"github.com/prometheus/prometheus/storage/local"
// 	"github.com/prometheus/prometheus/storage/metric"
// 	"golang.org/x/net/context"
// )

// type DefaultSeriesIterator struct {
// 	it SeriesIterator
// }

// func (it *DefaultSeriesIterator) ValueAtOrBeforeTime(ts model.Time) model.SamplePair {
// 	sp, ok := it.it.Seek(ts)
// 	if !ok {
// 		return model.SamplePair{Timestamp: model.Earliest}
// 	}
// 	return sp
// }

// func (it *DefaultSeriesIterator) Metric() metric.Metric {
// 	m := it.it.Metric()
// 	met := make(model.Metric, len(m))
// 	for k, v := range m {
// 		met[model.LabelName(k)] = model.LabelValue(v)
// 	}
// 	return metric.Metric{Metric: met, Copied: true}
// }

// func (it *DefaultSeriesIterator) RangeValues(interval metric.Interval) []model.SamplePair {
// 	var res []model.SamplePair
// 	for sp, ok := it.it.Seek(interval.NewestInclusive); ok; sp, ok = it.it.Next() {
// 		if sp.Timestamp > interval.OldestInclusive {
// 			break
// 		}
// 		res = append(res, sp)
// 	}
// 	return res
// }

// func (it *DefaultSeriesIterator) Close() {
// }

// // DefaultAdapter wraps a tsdb storage to implement the default
// // storage interface.
// type DefaultAdapter struct {
// 	db *DB
// }

// func NewDefaultAdapter(db *DB) *DefaultAdapter {
// 	return &DefaultAdapter{db: db}
// }

// // Drop all time series associated with the given label matchers. Returns
// // the number series that were dropped.
// func (da *DefaultAdapter) DropMetricsForLabelMatchers(context.Context, ...*metric.LabelMatcher) (int, error) {
// 	return 0, fmt.Errorf("not implemented")
// }

// // Start the various maintenance loops in goroutines. Returns when the
// // storage is ready to use. Keeps everything running in the background
// // until Stop is called.
// func (da *DefaultAdapter) Start() error {
// 	return nil
// }

// // Stop shuts down the Storage gracefully, flushes all pending
// // operations, stops all maintenance loops,and frees all resources.
// func (da *DefaultAdapter) Stop() error {
// 	return da.db.Close()
// }

// // WaitForIndexing returns once all samples in the storage are
// // indexed. Indexing is needed for FingerprintsForLabelMatchers and
// // LabelValuesForLabelName and may lag behind.
// func (da *DefaultAdapter) WaitForIndexing() {
// 	da.db.indexer.wait()
// }

// func (da *DefaultAdapter) Append(s *model.Sample) error {
// 	// Ignore the Scrape batching for now.
// 	return da.db.memChunks.append(s.Metric, s.Timestamp, s.Value)
// }

// func (da *DefaultAdapter) NeedsThrottling() bool {
// 	return false
// }

// func (da *DefaultAdapter) Querier() (local.Querier, error) {
// 	q, err := da.db.Querier()
// 	if err != nil {
// 		return nil, err
// 	}
// 	return defaultQuerierAdapter{q: q}, nil
// }

// type defaultQuerierAdapter struct {
// 	q *Querier
// }

// func (da defaultQuerierAdapter) Close() error {
// 	return da.q.Close()
// }

// // QueryRange returns a list of series iterators for the selected
// // time range and label matchers. The iterators need to be closed
// // after usage.
// func (da defaultQuerierAdapter) QueryRange(ctx context.Context, from, through model.Time, matchers ...*metric.LabelMatcher) ([]local.SeriesIterator, error) {
// 	it, err := labelMatchersIter(da.q, matchers...)
// 	if err != nil {
// 		return nil, err
// 	}
// 	its, err := da.q.Series(it)
// 	if err != nil {
// 		return nil, err
// 	}
// 	var defaultIts []local.SeriesIterator
// 	for _, it := range its {
// 		defaultIts = append(defaultIts, &DefaultSeriesIterator{it: it})
// 	}
// 	return defaultIts, nil
// }

// // QueryInstant returns a list of series iterators for the selected
// // instant and label matchers. The iterators need to be closed after usage.
// func (da defaultQuerierAdapter) QueryInstant(ctx context.Context, ts model.Time, stalenessDelta time.Duration, matchers ...*metric.LabelMatcher) ([]local.SeriesIterator, error) {
// 	return da.QueryRange(ctx, ts.Add(-stalenessDelta), ts, matchers...)
// }

// // MetricsForLabelMatchers returns the metrics from storage that satisfy
// // the given sets of label matchers. Each set of matchers must contain at
// // least one label matcher that does not match the empty string. Otherwise,
// // an empty list is returned. Within one set of matchers, the intersection
// // of matching series is computed. The final return value will be the union
// // of the per-set results. The times from and through are hints for the
// // storage to optimize the search. The storage MAY exclude metrics that
// // have no samples in the specified interval from the returned map. In
// // doubt, specify model.Earliest for from and model.Latest for through.
// func (da defaultQuerierAdapter) MetricsForLabelMatchers(ctx context.Context, from, through model.Time, matcherSets ...metric.LabelMatchers) ([]metric.Metric, error) {
// 	var mits []index.Iterator
// 	for _, ms := range matcherSets {
// 		it, err := labelMatchersIter(da.q, ms...)
// 		if err != nil {
// 			return nil, err
// 		}
// 		mits = append(mits, it)
// 	}

// 	res, err := da.q.Metrics(index.Merge(mits...))
// 	if err != nil {
// 		return nil, err
// 	}
// 	var mres []metric.Metric
// 	for _, m := range res {
// 		met := make(model.Metric, len(m))
// 		for k, v := range m {
// 			met[model.LabelName(k)] = model.LabelValue(v)
// 		}
// 		mres = append(mres, metric.Metric{Metric: met, Copied: true})
// 	}
// 	return mres, nil
// }

// func labelMatchersIter(q *Querier, ms ...*metric.LabelMatcher) (index.Iterator, error) {
// 	var its []index.Iterator
// 	for _, m := range ms {
// 		var matcher index.Matcher
// 		switch m.Type {
// 		case metric.Equal:
// 			matcher = index.NewEqualMatcher(string(m.Value))
// 		case metric.RegexMatch:
// 			var err error
// 			matcher, err = index.NewRegexpMatcher(string(m.Value))
// 			if err != nil {
// 				return nil, err
// 			}
// 		default:
// 			return nil, fmt.Errorf("matcher type %q not supported", m.Type)
// 		}
// 		it, err := q.Iterator(string(m.Name), matcher)
// 		if err != nil {
// 			return nil, err
// 		}
// 		its = append(its, it)
// 	}
// 	if len(its) == 0 {
// 		return nil, errors.New("not found")
// 	}
// 	return index.Intersect(its...), nil
// }

// // LastSampleForFingerprint returns the last sample that has been
// // ingested for the given sets of label matchers. If this instance of the
// // Storage has never ingested a sample for the provided fingerprint (or
// // the last ingestion is so long ago that the series has been archived),
// // ZeroSample is returned. The label matching behavior is the same as in
// // MetricsForLabelMatchers.
// func (da defaultQuerierAdapter) LastSampleForLabelMatchers(ctx context.Context, cutoff model.Time, matcherSets ...metric.LabelMatchers) (model.Vector, error) {
// 	return nil, fmt.Errorf("not implemented")
// }

// // Get all of the label values that are associated with a given label name.
// func (da defaultQuerierAdapter) LabelValuesForLabelName(ctx context.Context, ln model.LabelName) (model.LabelValues, error) {
// 	res := da.q.iq.Terms(string(ln), nil)
// 	resv := model.LabelValues{}
// 	for _, lv := range res {
// 		resv = append(resv, model.LabelValue(lv))
// 	}
// 	return resv, nil
// }