package arbo

import (
	"bytes"
	"io"
	"io/ioutil"
	"os"
	"testing"
	"time"

	qt "github.com/frankban/quicktest"
	"go.vocdoni.io/dvote/db"
	"go.vocdoni.io/dvote/db/badgerdb"
)

func checkRoots(c *qt.C, tree1, tree2 *Tree) {
	root1, err := tree1.Root()
	c.Assert(err, qt.IsNil)
	root2, err := tree2.Root()
	c.Assert(err, qt.IsNil)
	if !bytes.Equal(root2, root1) {
		dir := "err-dump"
		if _, err := os.Stat(dir); os.IsNotExist(err) {
			err := os.Mkdir(dir, os.ModePerm)
			c.Assert(err, qt.IsNil)
		}
		// store tree1
		storeTree(c, tree1, dir+"/tree1")

		// store tree2
		storeTree(c, tree2, dir+"/tree2")

		root1, err := tree1.Root()
		c.Assert(err, qt.IsNil)
		root2, err := tree2.Root()
		c.Assert(err, qt.IsNil)
		c.Check(root2, qt.DeepEquals, root1)
	}
}

func storeTree(c *qt.C, tree *Tree, path string) {
	dump, err := tree.Dump(nil)
	c.Assert(err, qt.IsNil)
	err = ioutil.WriteFile(path+"-"+time.Now().String()+".debug", dump, 0600)
	c.Assert(err, qt.IsNil)
}

// nolint:unused
func readTree(c *qt.C, tree *Tree, path string) {
	b, err := ioutil.ReadFile(path) //nolint:gosec
	c.Assert(err, qt.IsNil)
	err = tree.ImportDump(b)
	c.Assert(err, qt.IsNil)
}

// nolint:unused
func importDumpLoopAdd(tree *Tree, b []byte) error {
	r := bytes.NewReader(b)
	var err error
	for {
		l := make([]byte, 2)
		_, err = io.ReadFull(r, l)
		if err == io.EOF {
			break
		} else if err != nil {
			return err
		}
		k := make([]byte, l[0])
		_, err = io.ReadFull(r, k)
		if err != nil {
			return err
		}
		v := make([]byte, l[1])
		_, err = io.ReadFull(r, v)
		if err != nil {
			return err
		}
		err = tree.Add(k, v)
		if err != nil {
			return err
		}
	}
	return nil
}

func TestReadTreeDBG(t *testing.T) {
	t.Skip() // test just for debugging purposes, disabled by default

	c := qt.New(t)

	database1, err := badgerdb.New(db.Options{Path: c.TempDir()})
	c.Assert(err, qt.IsNil)
	tree1, err := NewTree(database1, 100, HashFunctionBlake2b)
	c.Assert(err, qt.IsNil)

	database2, err := badgerdb.New(db.Options{Path: c.TempDir()})
	c.Assert(err, qt.IsNil)
	tree2, err := NewTree(database2, 100, HashFunctionBlake2b)
	c.Assert(err, qt.IsNil)

	// tree1 is generated by a loop of .Add
	path := "err-dump/tree1-2021-06-03 16:45:54.104449306 +0200 CEST m=+0.073874545.debug"
	b, err := ioutil.ReadFile(path)
	c.Assert(err, qt.IsNil)
	err = importDumpLoopAdd(tree1, b)
	c.Assert(err, qt.IsNil)

	// tree2 is generated by .AddBatch
	path = "err-dump/tree2-2021-06-03 16:45:54.104525519 +0200 CEST m=+0.073950756.debug"
	readTree(c, tree2, path)

	// tree1.PrintGraphvizFirstNLevels(nil, 6)
	// tree2.PrintGraphvizFirstNLevels(nil, 6)

	root1, err := tree1.Root()
	c.Assert(err, qt.IsNil)
	root2, err := tree2.Root()
	c.Assert(err, qt.IsNil)
	c.Check(root2, qt.DeepEquals, root1)
}