package db

import (
	"bytes"
	"testing"
	"time"

	"github.com/gogo/protobuf/proto"
)

func TestInitializeState(t *testing.T) {
	db := setupDB(t)
	defer teardownDB(t, db)

	genesisTime := uint64(time.Now().Unix())
	if err := db.InitializeState(genesisTime); err != nil {
		t.Fatalf("Failed to initialize state: %v", err)
	}
	b, err := db.ChainHead()
	if err != nil {
		t.Fatalf("Failed to get chain head: %v", err)
	}
	if b.GetSlot() != 0 {
		t.Fatalf("Expected block height to equal 1. Got %d", b.GetSlot())
	}

	beaconState, err := db.State()
	if err != nil {
		t.Fatalf("Failed to get state: %v", err)
	}
	if beaconState == nil {
		t.Fatalf("Failed to retrieve state: %v", beaconState)
	}
	beaconStateEnc, err := proto.Marshal(beaconState)
	if err != nil {
		t.Fatalf("Failed to encode state: %v", err)
	}

	statePrime, err := db.State()
	if err != nil {
		t.Fatalf("Failed to get state: %v", err)
	}
	statePrimeEnc, err := proto.Marshal(statePrime)
	if err != nil {
		t.Fatalf("Failed to encode state: %v", err)
	}

	if !bytes.Equal(beaconStateEnc, statePrimeEnc) {
		t.Fatalf("Expected %#x and %#x to be equal", beaconStateEnc, statePrimeEnc)
	}
}

func TestGenesisTime(t *testing.T) {
	db := setupDB(t)
	defer teardownDB(t, db)

	genesisTime, err := db.GenesisTime()
	if err == nil {
		t.Fatal("expected GenesisTime to fail")
	}

	if err := db.InitializeState(uint64(genesisTime.Unix())); err != nil {
		t.Fatalf("failed to initialize state: %v", err)
	}

	time1, err := db.GenesisTime()
	if err != nil {
		t.Fatalf("GenesisTime failed on second attempt: %v", err)
	}
	time2, err := db.GenesisTime()
	if err != nil {
		t.Fatalf("GenesisTime failed on second attempt: %v", err)
	}

	if time1 != time2 {
		t.Fatalf("Expected %v and %v to be equal", time1, time2)
	}
}