package rc

import (
	"context"
	"runtime"
	"testing"
	"time"

	"github.com/ncw/rclone/fs"
	"github.com/pkg/errors"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestNewJobs(t *testing.T) {
	jobs := newJobs()
	assert.Equal(t, 0, len(jobs.jobs))
}

func TestJobsKickExpire(t *testing.T) {
	jobs := newJobs()
	jobs.expireInterval = time.Millisecond
	assert.Equal(t, false, jobs.expireRunning)
	jobs.kickExpire()
	jobs.mu.Lock()
	assert.Equal(t, true, jobs.expireRunning)
	jobs.mu.Unlock()
	time.Sleep(10 * time.Millisecond)
	jobs.mu.Lock()
	assert.Equal(t, false, jobs.expireRunning)
	jobs.mu.Unlock()
}

func TestJobsExpire(t *testing.T) {
	wait := make(chan struct{})
	jobs := newJobs()
	jobs.expireInterval = time.Millisecond
	assert.Equal(t, false, jobs.expireRunning)
	job := jobs.NewJob(func(ctx context.Context, in Params) (Params, error) {
		defer close(wait)
		return in, nil
	}, Params{})
	<-wait
	assert.Equal(t, 1, len(jobs.jobs))
	jobs.Expire()
	assert.Equal(t, 1, len(jobs.jobs))
	jobs.mu.Lock()
	job.mu.Lock()
	job.EndTime = time.Now().Add(-fs.Config.RcJobExpireDuration - 60*time.Second)
	assert.Equal(t, true, jobs.expireRunning)
	job.mu.Unlock()
	jobs.mu.Unlock()
	time.Sleep(10 * time.Millisecond)
	jobs.mu.Lock()
	assert.Equal(t, false, jobs.expireRunning)
	assert.Equal(t, 0, len(jobs.jobs))
	jobs.mu.Unlock()
}

var noopFn = func(ctx context.Context, in Params) (Params, error) {
	return nil, nil
}

func TestJobsIDs(t *testing.T) {
	jobs := newJobs()
	job1 := jobs.NewJob(noopFn, Params{})
	job2 := jobs.NewJob(noopFn, Params{})
	wantIDs := []int64{job1.ID, job2.ID}
	gotIDs := jobs.IDs()
	require.Equal(t, 2, len(gotIDs))
	if gotIDs[0] != wantIDs[0] {
		gotIDs[0], gotIDs[1] = gotIDs[1], gotIDs[0]
	}
	assert.Equal(t, wantIDs, gotIDs)
}

func TestJobsGet(t *testing.T) {
	jobs := newJobs()
	job := jobs.NewJob(noopFn, Params{})
	assert.Equal(t, job, jobs.Get(job.ID))
	assert.Nil(t, jobs.Get(123123123123))
}

var longFn = func(ctx context.Context, in Params) (Params, error) {
	// TODO get execution time from context?
	time.Sleep(1 * time.Hour)
	return nil, nil
}

const (
	sleepTime      = 100 * time.Millisecond
	floatSleepTime = float64(sleepTime) / 1E9 / 2
)

// sleep for some time so job.Duration is non-0
func sleepJob() {
	time.Sleep(sleepTime)
}

func TestJobFinish(t *testing.T) {
	jobs := newJobs()
	job := jobs.NewJob(longFn, Params{})
	sleepJob()

	assert.Equal(t, true, job.EndTime.IsZero())
	assert.Equal(t, Params(nil), job.Output)
	assert.Equal(t, 0.0, job.Duration)
	assert.Equal(t, "", job.Error)
	assert.Equal(t, false, job.Success)
	assert.Equal(t, false, job.Finished)

	wantOut := Params{"a": 1}
	job.finish(wantOut, nil)

	assert.Equal(t, false, job.EndTime.IsZero())
	assert.Equal(t, wantOut, job.Output)
	assert.True(t, job.Duration >= floatSleepTime)
	assert.Equal(t, "", job.Error)
	assert.Equal(t, true, job.Success)
	assert.Equal(t, true, job.Finished)

	job = jobs.NewJob(longFn, Params{})
	sleepJob()
	job.finish(nil, nil)

	assert.Equal(t, false, job.EndTime.IsZero())
	assert.Equal(t, Params{}, job.Output)
	assert.True(t, job.Duration >= floatSleepTime)
	assert.Equal(t, "", job.Error)
	assert.Equal(t, true, job.Success)
	assert.Equal(t, true, job.Finished)

	job = jobs.NewJob(longFn, Params{})
	sleepJob()
	job.finish(wantOut, errors.New("potato"))

	assert.Equal(t, false, job.EndTime.IsZero())
	assert.Equal(t, wantOut, job.Output)
	assert.True(t, job.Duration >= floatSleepTime)
	assert.Equal(t, "potato", job.Error)
	assert.Equal(t, false, job.Success)
	assert.Equal(t, true, job.Finished)
}

// We've tested the functionality of run() already as it is
// part of NewJob, now just test the panic catching
func TestJobRunPanic(t *testing.T) {
	wait := make(chan struct{})
	boom := func(ctx context.Context, in Params) (Params, error) {
		sleepJob()
		defer close(wait)
		panic("boom")
	}

	jobs := newJobs()
	job := jobs.NewJob(boom, Params{})
	<-wait
	runtime.Gosched() // yield to make sure job is updated

	// Wait a short time for the panic to propagate
	for i := uint(0); i < 10; i++ {
		job.mu.Lock()
		e := job.Error
		job.mu.Unlock()
		if e != "" {
			break
		}
		time.Sleep(time.Millisecond << i)
	}

	job.mu.Lock()
	assert.Equal(t, false, job.EndTime.IsZero())
	assert.Equal(t, Params{}, job.Output)
	assert.True(t, job.Duration >= floatSleepTime)
	assert.Equal(t, "panic received: boom", job.Error)
	assert.Equal(t, false, job.Success)
	assert.Equal(t, true, job.Finished)
	job.mu.Unlock()
}

func TestJobsNewJob(t *testing.T) {
	jobID = 0
	jobs := newJobs()
	job := jobs.NewJob(noopFn, Params{})
	assert.Equal(t, int64(1), job.ID)
	assert.Equal(t, job, jobs.Get(1))

}

func TestStartJob(t *testing.T) {
	jobID = 0
	out, err := StartJob(longFn, Params{})
	assert.NoError(t, err)
	assert.Equal(t, Params{"jobid": int64(1)}, out)
}

func TestRcJobStatus(t *testing.T) {
	jobID = 0
	_, err := StartJob(longFn, Params{})
	assert.NoError(t, err)

	call := Calls.Get("job/status")
	assert.NotNil(t, call)
	in := Params{"jobid": 1}
	out, err := call.Fn(context.Background(), in)
	require.NoError(t, err)
	require.NotNil(t, out)
	assert.Equal(t, float64(1), out["id"])
	assert.Equal(t, "", out["error"])
	assert.Equal(t, false, out["finished"])
	assert.Equal(t, false, out["success"])

	in = Params{"jobid": 123123123}
	_, err = call.Fn(context.Background(), in)
	require.Error(t, err)
	assert.Contains(t, err.Error(), "job not found")

	in = Params{"jobidx": 123123123}
	_, err = call.Fn(context.Background(), in)
	require.Error(t, err)
	assert.Contains(t, err.Error(), "Didn't find key")
}

func TestRcJobList(t *testing.T) {
	jobID = 0
	_, err := StartJob(longFn, Params{})
	assert.NoError(t, err)

	call := Calls.Get("job/list")
	assert.NotNil(t, call)
	in := Params{}
	out, err := call.Fn(context.Background(), in)
	require.NoError(t, err)
	require.NotNil(t, out)
	assert.Equal(t, Params{"jobids": []int64{1}}, out)
}