package database

import (
	"fmt"
	"slices"
	"testing"

	"gordenko.dev/dima/qb"
	"gordenko.dev/dima/qb/storage"
)

func TestWriteReadSnapshot(t *testing.T) {
	metrics := make(map[uint32]*_metric)
	metrics[1] = &_metric{
		metricType: qb.Cumulative,
		fracDigits: 3,
		lastPageNo: 1000,
		buffer:     []byte{},
	}
	in := writeSnapshotIn{
		SnapshotNumber:        1,
		Dir:                   ".",
		WriteBufferSize:       8 * 1024 * 1024,
		Metrics:               metrics,
		FrozenIndexPagesCount: 7,
		IndexPageNumbers: []uint32{
			1, 2, 3, 4, 5,
		},
		FrozenDataPagesCount: 8,
		DataPageNumbers: []uint32{
			6, 7, 8,
		},
	}
	err := writeSnapshot(in)
	if err != nil {
		t.Fatalf("writeSnapshot: %s", err)
	}

	out, err := readSnapshot("1.snapshot")
	if err != nil {
		return
	}

	if out.FrozenIndexPagesCount != in.FrozenIndexPagesCount {
		t.Fatalf("FrozenIndexPagesCount: got %d are not equal expected %d",
			out.FrozenIndexPagesCount, in.FrozenIndexPagesCount)
	}
	if out.FrozenDataPagesCount != in.FrozenDataPagesCount {
		t.Fatalf("FrozenDataPagesCount: got %d are not equal expected %d",
			out.FrozenDataPagesCount, in.FrozenDataPagesCount)
	}
	if !slices.Equal(out.IndexPageNumbers, in.IndexPageNumbers) {
		t.Fatalf("IndexPageNumbers: got %v are not equal expected %v",
			out.IndexPageNumbers, in.IndexPageNumbers)
	}
	if !slices.Equal(out.DataPageNumbers, in.DataPageNumbers) {
		t.Fatalf("DataPageNumbers: got %v are not equal expected %v",
			out.DataPageNumbers, in.DataPageNumbers)
	}
	for metricID, replay := range out.Metrics {
		origin, ok := metrics[metricID]
		if !ok {
			t.Fatalf("decoded metricID %d not found in metrics", metricID)
		}
		err = cmpMetric(replay, origin)
		if err != nil {
			t.Fatalf("metric %d: %s", metricID, err)
		}
	}
}

func cmpMetric(replay *ReplayMetric, origin *_metric) error {
	if replay.metricType != origin.metricType {
		return fmt.Errorf("metricType: got %d are not equal expected %d",
			replay.metricType, origin.metricType)
	}
	if replay.fracDigits != origin.fracDigits {
		return fmt.Errorf("fracDigits: got %d are not equal expected %d",
			replay.fracDigits, origin.fracDigits)
	}
	if replay.lastPageNo != origin.lastPageNo {
		return fmt.Errorf("lastPageNo: got %d are not equal expected %d",
			replay.lastPageNo, origin.lastPageNo)
	}
	// if !refect.DeepEq{
	// 	return fmt.Errorf("lastPageNo: got %d are not equal expected %d",
	// 		replay.lastPageNo, origin.lastPageNo)
	// }
	return nil
}

func TestComposeHeadIndexPage(t *testing.T) {
	var (
		levelIdx = 0
		level    = storage.IndexLevelTail{
			Buffer: []byte{
				1, 2, 3,
			},
			RecordsCount: 2,
		}
		head = &storage.HeadIndexPage{
			PageNo:   100,
			Checksum: 12345,
			Records:  []byte{},
		}
	)
	page := composeHeadIndexPage(levelIdx, level, head)
	if page.PageNo != head.PageNo {
		t.Fatalf("PageNo: got %d are not equal expected %v",
			page.PageNo, head.PageNo)
	}
	// fix compare pages
}