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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package protocols

import (
    "io/ioutil"
    "os"
    "path/filepath"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/log"
)

//TestReporter tests that the metrics being collected for p2p accounting
//are being persisted and available after restart of a node.
//It simulates restarting by just recreating the DB as if the node had restarted.
func TestReporter(t *testing.T) {
    //create a test directory
    dir, err := ioutil.TempDir("", "reporter-test")
    if err != nil {
        t.Fatal(err)
    }
    defer os.RemoveAll(dir)

    //setup the metrics
    log.Debug("Setting up metrics first time")
    reportInterval := 5 * time.Millisecond
    metrics := SetupAccountingMetrics(reportInterval, filepath.Join(dir, "test.db"))
    log.Debug("Done.")

    //change metrics
    mBalanceCredit.Inc(12)
    mBytesCredit.Inc(34)
    mMsgDebit.Inc(9)

    //store expected metrics
    expectedBalanceCredit := mBalanceCredit.Count()
    expectedBytesCredit := mBytesCredit.Count()
    expectedMsgDebit := mMsgDebit.Count()

    //give the reporter time to write the metrics to DB
    time.Sleep(20 * time.Millisecond)

    //close the DB also, or we can't create a new one
    metrics.Close()

    //clear the metrics - this effectively simulates the node having shut down...
    mBalanceCredit.Clear()
    mBytesCredit.Clear()
    mMsgDebit.Clear()

    //setup the metrics again
    log.Debug("Setting up metrics second time")
    metrics = SetupAccountingMetrics(reportInterval, filepath.Join(dir, "test.db"))
    defer metrics.Close()
    log.Debug("Done.")

    //now check the metrics, they should have the same value as before "shutdown"
    if mBalanceCredit.Count() != expectedBalanceCredit {
        t.Fatalf("Expected counter to be %d, but is %d", expectedBalanceCredit, mBalanceCredit.Count())
    }
    if mBytesCredit.Count() != expectedBytesCredit {
        t.Fatalf("Expected counter to be %d, but is %d", expectedBytesCredit, mBytesCredit.Count())
    }
    if mMsgDebit.Count() != expectedMsgDebit {
        t.Fatalf("Expected counter to be %d, but is %d", expectedMsgDebit, mMsgDebit.Count())
    }
}