// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package daemonreap_test

import (
	"syscall"
	"testing"
	"time"

	"v.io/v23/naming"
	"v.io/v23/services/device"
	"v.io/v23/services/stats"
	"v.io/v23/vdl"

	"v.io/x/ref/services/device/internal/impl/utiltest"
	"v.io/x/ref/services/internal/servicetest"
)

func TestDaemonRestart(t *testing.T) {
	cleanup, ctx, sh, envelope, root, helperPath, _ := utiltest.StartupHelper(t)
	defer cleanup()

	// Set up the device manager.  Since we won't do device manager updates,
	// don't worry about its application envelope and current link.
	dmh := servicetest.RunCommand(t, sh, nil, utiltest.DeviceManager, "dm", root, helperPath, "unused_app_repo_name", "unused_curr_link")
	servicetest.ReadPID(t, dmh)
	utiltest.ClaimDevice(t, ctx, "claimable", "dm", "mydevice", utiltest.NoPairingToken)

	// Create the local server that the app uses to let us know it's ready.
	pingCh, cleanup := utiltest.SetupPingServer(t, ctx)
	defer cleanup()

	utiltest.Resolve(t, ctx, "pingserver", 1, true)

	// Create an envelope for a first version of the app that will be restarted once.
	*envelope = utiltest.EnvelopeFromShell(sh, nil, utiltest.App, "google naps", 1, 10*time.Second, "appV1")
	appID := utiltest.InstallApp(t, ctx)

	// Start an instance of the app.
	instance1ID := utiltest.LaunchApp(t, ctx, appID)

	// Wait until the app pings us that it's ready.
	pingCh.VerifyPingArgs(t, utiltest.UserName(t), "default", "")

	// Get application pid.
	name := naming.Join("dm", "apps/"+appID+"/"+instance1ID+"/stats/system/pid")
	c := stats.StatsClient(name)
	v, err := c.Value(ctx)
	if err != nil {
		t.Fatalf("Value() failed: %v\n", err)
	}
	var pid int
	if err := vdl.Convert(&pid, v); err != nil {
		t.Fatalf("pid returned from stats interface is not an int: %v", err)
	}

	utiltest.VerifyState(t, ctx, device.InstanceStateRunning, appID, instance1ID)
	syscall.Kill(int(pid), 9)

	// Start a second instance of the app which will force polling to happen.
	instance2ID := utiltest.LaunchApp(t, ctx, appID)
	pingCh.VerifyPingArgs(t, utiltest.UserName(t), "default", "")

	// TODO(rjkroege): Because there is no daemon mode, instance1ID is not running even
	// though it should be.
	utiltest.VerifyState(t, ctx, device.InstanceStateNotRunning, appID, instance1ID)

	// TODO(rjkroege): Demonstrate that the device manager will only restart the app the
	// configured number of times (1)

	// instance2ID is still running though.
	utiltest.VerifyState(t, ctx, device.InstanceStateRunning, appID, instance2ID)

	// Cleanup.
	utiltest.TerminateApp(t, ctx, appID, instance2ID)

	// TODO(rjkroege): instance1ID isn't running but should be.
	// utiltest.TerminateApp(t, ctx, appID, instance1ID)

	// Cleanly shut down the device manager.
	utiltest.VerifyNoRunningProcesses(t)
	syscall.Kill(dmh.Pid(), syscall.SIGINT)
	dmh.Expect("dm terminated")
	dmh.ExpectEOF()
}