package mdb

import (
	"fmt"
	"reflect"
	"testing"
)

func (i Index[T]) AssertEqual(t *testing.T, tx1, tx2 *Snapshot) {
	t.Helper()

	state1 := i.getState(tx1)
	state2 := i.getState(tx2)

	if state1.BTree.Len() != state2.BTree.Len() {
		t.Fatalf("(%s) Unequal lengths: %d != %d",
			i.name,
			state1.BTree.Len(),
			state2.BTree.Len())
	}

	errStr := ""
	i.Ascend(tx1, func(item1 *T) bool {
		item2 := i.Get(tx2, item1)
		if item2 == nil {
			errStr = fmt.Sprintf("Indices don't match. %v not found.", item1)
			return false
		}
		if !reflect.DeepEqual(item1, item2) {
			errStr = fmt.Sprintf("%v != %v", item1, item2)
			return false
		}
		return true
	})

	if errStr != "" {
		t.Fatal(errStr)
	}
}

func (c *Collection[T]) AssertEqual(t *testing.T, tx1, tx2 *Snapshot) {
	t.Helper()
	c.ByID.AssertEqual(t, tx1, tx2)

	for _, idx := range c.indices {
		idx.AssertEqual(t, tx1, tx2)
	}
}

func (db *Database) AssertEqual(t *testing.T, db2 *Database) {
	tx1 := db.Snapshot()
	tx2 := db.Snapshot()
	for _, c := range db.collections {
		cc := c.(interface {
			AssertEqual(t *testing.T, tx1, tx2 *Snapshot)
		})
		cc.AssertEqual(t, tx1, tx2)
	}
}