package client

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

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// helpers ----------------------------------------------------------------

func makeServers(urls ...string) []Server {
	out := make([]Server, len(urls))
	for i, u := range urls {
		out[i] = Server{Url: u}
	}
	return out
}

func pushJob(t *testing.T, dir, queue, file string, servers []Server, timeout int) {
	t.Helper()
	require.NoError(t, PushSendJob(dir, &SendJob{
		Queue:   queue,
		File:    file,
		Servers: servers,
		Timeout: timeout,
	}))
}

// tests ------------------------------------------------------------------

func TestPushAndPeekSendJob(t *testing.T) {
	dir := t.TempDir()
	servers := makeServers("http://s1.example", "http://s2.example")
	pushJob(t, dir, "q1", "/tmp/msg", servers, 60)

	got, id, err := PeekSendJob(dir, "q1")
	require.NoError(t, err)
	require.NotNil(t, got)

	assert.Greater(t, id, int64(0))
	assert.Equal(t, "/tmp/msg", got.File)
	assert.Equal(t, 60, got.Timeout)
	assert.Equal(t, SendStatusPending, got.Status)
	assert.Nil(t, got.SentAt)
	assert.Nil(t, got.SuccessfulServer)
	assert.Len(t, got.Retries, 2)
	assert.Equal(t, 0, got.Retries[0])
	assert.Equal(t, 0, got.Retries[1])
	assert.WithinDuration(t, time.Now(), got.InsertedAt, 5*time.Second)
}

func TestPeekSendJob_EmptyQueue(t *testing.T) {
	dir := t.TempDir()
	got, id, err := PeekSendJob(dir, "empty")
	require.NoError(t, err)
	assert.Nil(t, got)
	assert.Equal(t, int64(0), id)
}

func TestPeekSendJob_OldestFirst(t *testing.T) {
	dir := t.TempDir()
	for _, f := range []string{"/a", "/b", "/c"} {
		pushJob(t, dir, "q1", f, makeServers("http://s1"), 0)
	}

	got, _, err := PeekSendJob(dir, "q1")
	require.NoError(t, err)
	require.NotNil(t, got)
	assert.Equal(t, "/a", got.File)
}

func TestPeekSendJob_SkipsNonPending(t *testing.T) {
	dir := t.TempDir()
	for _, f := range []string{"/a", "/b", "/c"} {
		pushJob(t, dir, "q1", f, makeServers("http://s1"), 0)
	}

	// mark first as sent
	first, _, err := PeekSendJob(dir, "q1")
	require.NoError(t, err)
	first.Status = SendStatusSent
	require.NoError(t, UpdateSendJob(dir, "q1", first))

	// mark second as failed
	second, _, err := PeekSendJob(dir, "q1")
	require.NoError(t, err)
	second.Status = SendStatusFailed
	require.NoError(t, UpdateSendJob(dir, "q1", second))

	// only /c is still pending
	got, _, err := PeekSendJob(dir, "q1")
	require.NoError(t, err)
	require.NotNil(t, got)
	assert.Equal(t, "/c", got.File)
}

func TestUpdateSendJob_Sent(t *testing.T) {
	dir := t.TempDir()
	pushJob(t, dir, "q1", "/tmp/f", makeServers("http://s1"), 10)

	job, id, err := PeekSendJob(dir, "q1")
	require.NoError(t, err)
	require.NotNil(t, job)

	now := time.Now()
	srvIdx := 0
	job.Status = SendStatusSent
	job.SentAt = &now
	job.SuccessfulServer = &srvIdx
	require.NoError(t, UpdateSendJob(dir, "q1", job))

	// persisted correctly
	got, err := GetSendJob(dir, "q1", id)
	require.NoError(t, err)
	require.NotNil(t, got)
	assert.Equal(t, SendStatusSent, got.Status)
	assert.NotNil(t, got.SentAt)
	assert.WithinDuration(t, now, *got.SentAt, time.Second)
	require.NotNil(t, got.SuccessfulServer)
	assert.Equal(t, 0, *got.SuccessfulServer)

	// no more pending jobs
	pending, _, err := PeekSendJob(dir, "q1")
	require.NoError(t, err)
	assert.Nil(t, pending)
}

func TestUpdateSendJob_Retries(t *testing.T) {
	dir := t.TempDir()
	pushJob(t, dir, "q1", "/tmp/f", makeServers("http://s1", "http://s2"), 10)

	job, id, err := PeekSendJob(dir, "q1")
	require.NoError(t, err)
	require.NotNil(t, job)

	job.Retries[0] = 2
	require.NoError(t, UpdateSendJob(dir, "q1", job))

	got, err := GetSendJob(dir, "q1", id)
	require.NoError(t, err)
	require.NotNil(t, got)
	assert.Equal(t, SendStatusPending, got.Status) // still pending
	assert.Equal(t, 2, got.Retries[0])
	assert.Equal(t, 0, got.Retries[1])
}

func TestGetSendJob_NotFound(t *testing.T) {
	dir := t.TempDir()
	pushJob(t, dir, "q1", "/tmp/f", makeServers("http://s1"), 0)

	got, err := GetSendJob(dir, "q1", 9999)
	require.NoError(t, err)
	assert.Nil(t, got)
}

func TestDeleteSendJob_KeepsDbWhenNotEmpty(t *testing.T) {
	dir := t.TempDir()
	pushJob(t, dir, "q1", "/a", makeServers("http://s1"), 0)
	pushJob(t, dir, "q1", "/b", makeServers("http://s1"), 0)

	_, id, err := PeekSendJob(dir, "q1")
	require.NoError(t, err)
	require.NoError(t, DeleteSendJob(dir, "q1", id))

	// DB file must still exist (second row remains)
	_, statErr := os.Stat(filepath.Join(dir, "queues", "q1"))
	require.NoError(t, statErr)
}

func TestDeleteSendJob_RemovesDbWhenEmpty(t *testing.T) {
	dir := t.TempDir()
	pushJob(t, dir, "q1", "/a", makeServers("http://s1"), 0)

	_, id, err := PeekSendJob(dir, "q1")
	require.NoError(t, err)
	require.NoError(t, DeleteSendJob(dir, "q1", id))

	_, statErr := os.Stat(filepath.Join(dir, "queues", "q1"))
	assert.True(t, os.IsNotExist(statErr), "DB file should be removed when queue is empty")
}