package blobovniczatree

import (
	"context"
	"os"
	"path/filepath"
	"strings"
	"testing"

	objectCore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobovnicza"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/internal/blobstortest"
	"github.com/stretchr/testify/require"
)

func TestDBExtensionFix(t *testing.T) {
	root := t.TempDir()
	createTestTree(t, 0, 2, 3, root)
	t.Run("adds suffix if not exists", func(t *testing.T) {
		openAndCloseTestTree(t, 2, 3, root)
		validateTestTree(t, root)
	})

	t.Run("not adds second suffix if exists", func(t *testing.T) {
		openAndCloseTestTree(t, 2, 3, root)
		validateTestTree(t, root)
	})
}

func createTestTree(t *testing.T, currentDepth, depth, width uint64, path string) {
	if currentDepth == depth {
		var w uint64
		for ; w < width; w++ {
			dbPath := filepath.Join(path, u64ToHexString(w))
			b := blobovnicza.New(blobovnicza.WithPath(dbPath))
			require.NoError(t, b.Open())
			require.NoError(t, b.Init())
			require.NoError(t, b.Close())
		}
		return
	}

	var w uint64
	for ; w < width; w++ {
		createTestTree(t, currentDepth+1, depth, width, filepath.Join(path, u64ToHexString(w)))
	}
}

func openAndCloseTestTree(t *testing.T, depth, width uint64, path string) {
	blz := NewBlobovniczaTree(
		WithBlobovniczaShallowDepth(depth),
		WithBlobovniczaShallowWidth(width),
		WithRootPath(path),
	)
	require.NoError(t, blz.Open(false))
	require.NoError(t, blz.Init())
	require.NoError(t, blz.Close())
}

func validateTestTree(t *testing.T, path string) {
	entries, err := os.ReadDir(path)
	require.NoError(t, err)

	for _, entry := range entries {
		if entry.IsDir() {
			validateTestTree(t, filepath.Join(path, entry.Name()))
		} else {
			require.True(t, strings.HasSuffix(entry.Name(), dbExtension))
			require.False(t, strings.HasSuffix(strings.TrimSuffix(entry.Name(), dbExtension), dbExtension))
		}
	}
}

func TestObjectsAvailableAfterDepthAndWidthEdit(t *testing.T) {
	t.Parallel()

	rootDir := t.TempDir()

	blz := NewBlobovniczaTree(
		WithBlobovniczaShallowDepth(3),
		WithBlobovniczaShallowWidth(5),
		WithRootPath(rootDir),
	)

	require.NoError(t, blz.Open(false))
	require.NoError(t, blz.Init())

	obj35 := blobstortest.NewObject(10 * 1024)
	addr35 := objectCore.AddressOf(obj35)
	raw, err := obj35.Marshal()
	require.NoError(t, err)

	pRes35, err := blz.Put(context.Background(), common.PutPrm{
		Address: addr35,
		Object:  obj35,
		RawData: raw,
	})
	require.NoError(t, err)

	gRes, err := blz.Get(context.Background(), common.GetPrm{
		Address:   addr35,
		StorageID: pRes35.StorageID,
	})
	require.NoError(t, err)
	require.EqualValues(t, obj35, gRes.Object)

	gRes, err = blz.Get(context.Background(), common.GetPrm{
		Address: addr35,
	})
	require.NoError(t, err)
	require.EqualValues(t, obj35, gRes.Object)

	require.NoError(t, blz.Close())

	// change depth and width
	blz = NewBlobovniczaTree(
		WithBlobovniczaShallowDepth(5),
		WithBlobovniczaShallowWidth(2),
		WithRootPath(rootDir),
	)

	require.NoError(t, blz.Open(false))
	require.NoError(t, blz.Init())

	gRes, err = blz.Get(context.Background(), common.GetPrm{
		Address:   addr35,
		StorageID: pRes35.StorageID,
	})
	require.NoError(t, err)
	require.EqualValues(t, obj35, gRes.Object)

	gRes, err = blz.Get(context.Background(), common.GetPrm{
		Address: addr35,
	})
	require.NoError(t, err)
	require.EqualValues(t, obj35, gRes.Object)

	obj52 := blobstortest.NewObject(10 * 1024)
	addr52 := objectCore.AddressOf(obj52)
	raw, err = obj52.Marshal()
	require.NoError(t, err)

	pRes52, err := blz.Put(context.Background(), common.PutPrm{
		Address: addr52,
		Object:  obj52,
		RawData: raw,
	})
	require.NoError(t, err)

	require.NoError(t, blz.Close())

	// change depth and width back
	blz = NewBlobovniczaTree(
		WithBlobovniczaShallowDepth(3),
		WithBlobovniczaShallowWidth(5),
		WithRootPath(rootDir),
	)
	require.NoError(t, blz.Open(false))
	require.NoError(t, blz.Init())

	gRes, err = blz.Get(context.Background(), common.GetPrm{
		Address:   addr35,
		StorageID: pRes35.StorageID,
	})
	require.NoError(t, err)
	require.EqualValues(t, obj35, gRes.Object)

	gRes, err = blz.Get(context.Background(), common.GetPrm{
		Address: addr35,
	})
	require.NoError(t, err)
	require.EqualValues(t, obj35, gRes.Object)

	gRes, err = blz.Get(context.Background(), common.GetPrm{
		Address:   addr52,
		StorageID: pRes52.StorageID,
	})
	require.NoError(t, err)
	require.EqualValues(t, obj52, gRes.Object)

	gRes, err = blz.Get(context.Background(), common.GetPrm{
		Address: addr52,
	})
	require.NoError(t, err)
	require.EqualValues(t, obj52, gRes.Object)

	require.NoError(t, blz.Close())
}