package db

import "testing"

func mockDBWithStuff() DB {
	db := NewMemDB()
	// Under "key" prefix
	db.Set(bz("key"), bz("value"))
	db.Set(bz("key1"), bz("value1"))
	db.Set(bz("key2"), bz("value2"))
	db.Set(bz("key3"), bz("value3"))
	db.Set(bz("something"), bz("else"))
	db.Set(bz(""), bz(""))
	db.Set(bz("k"), bz("val"))
	db.Set(bz("ke"), bz("valu"))
	db.Set(bz("kee"), bz("valuu"))
	return db
}

func TestPrefixDBSimple(t *testing.T) {
	db := mockDBWithStuff()
	pdb := NewPrefixDB(db, bz("key"))

	checkValue(t, pdb, bz("key"), nil)
	checkValue(t, pdb, bz(""), bz("value"))
	checkValue(t, pdb, bz("key1"), nil)
	checkValue(t, pdb, bz("1"), bz("value1"))
	checkValue(t, pdb, bz("key2"), nil)
	checkValue(t, pdb, bz("2"), bz("value2"))
	checkValue(t, pdb, bz("key3"), nil)
	checkValue(t, pdb, bz("3"), bz("value3"))
	checkValue(t, pdb, bz("something"), nil)
	checkValue(t, pdb, bz("k"), nil)
	checkValue(t, pdb, bz("ke"), nil)
	checkValue(t, pdb, bz("kee"), nil)
}

func TestPrefixDBIterator1(t *testing.T) {
	db := mockDBWithStuff()
	pdb := NewPrefixDB(db, bz("key"))

	itr := pdb.Iterator(nil, nil)
	checkDomain(t, itr, nil, nil)
	checkItem(t, itr, bz(""), bz("value"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz("1"), bz("value1"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz("2"), bz("value2"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz("3"), bz("value3"))
	checkNext(t, itr, false)
	checkInvalid(t, itr)
	itr.Close()
}

func TestPrefixDBIterator2(t *testing.T) {
	db := mockDBWithStuff()
	pdb := NewPrefixDB(db, bz("key"))

	itr := pdb.Iterator(nil, bz(""))
	checkDomain(t, itr, nil, bz(""))
	checkInvalid(t, itr)
	itr.Close()
}

func TestPrefixDBIterator3(t *testing.T) {
	db := mockDBWithStuff()
	pdb := NewPrefixDB(db, bz("key"))

	itr := pdb.Iterator(bz(""), nil)
	checkDomain(t, itr, bz(""), nil)
	checkItem(t, itr, bz(""), bz("value"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz("1"), bz("value1"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz("2"), bz("value2"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz("3"), bz("value3"))
	checkNext(t, itr, false)
	checkInvalid(t, itr)
	itr.Close()
}

func TestPrefixDBIterator4(t *testing.T) {
	db := mockDBWithStuff()
	pdb := NewPrefixDB(db, bz("key"))

	itr := pdb.Iterator(bz(""), bz(""))
	checkDomain(t, itr, bz(""), bz(""))
	checkInvalid(t, itr)
	itr.Close()
}

func TestPrefixDBReverseIterator1(t *testing.T) {
	db := mockDBWithStuff()
	pdb := NewPrefixDB(db, bz("key"))

	itr := pdb.ReverseIterator(nil, nil)
	checkDomain(t, itr, nil, nil)
	checkItem(t, itr, bz("3"), bz("value3"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz("2"), bz("value2"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz("1"), bz("value1"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz(""), bz("value"))
	checkNext(t, itr, false)
	checkInvalid(t, itr)
	itr.Close()
}

func TestPrefixDBReverseIterator2(t *testing.T) {
	db := mockDBWithStuff()
	pdb := NewPrefixDB(db, bz("key"))

	itr := pdb.ReverseIterator(nil, bz(""))
	checkDomain(t, itr, nil, bz(""))
	checkItem(t, itr, bz("3"), bz("value3"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz("2"), bz("value2"))
	checkNext(t, itr, true)
	checkItem(t, itr, bz("1"), bz("value1"))
	checkNext(t, itr, false)
	checkInvalid(t, itr)
	itr.Close()
}

func TestPrefixDBReverseIterator3(t *testing.T) {
	db := mockDBWithStuff()
	pdb := NewPrefixDB(db, bz("key"))

	itr := pdb.ReverseIterator(bz(""), nil)
	checkDomain(t, itr, bz(""), nil)
	checkItem(t, itr, bz(""), bz("value"))
	checkNext(t, itr, false)
	checkInvalid(t, itr)
	itr.Close()
}

func TestPrefixDBReverseIterator4(t *testing.T) {
	db := mockDBWithStuff()
	pdb := NewPrefixDB(db, bz("key"))

	itr := pdb.ReverseIterator(bz(""), bz(""))
	checkInvalid(t, itr)
	itr.Close()
}