package main

import (
	"encoding/gob"
	"encoding/json"
	"net"
	"net/http/httptest"
	"testing"
	"time"

	"macker/datapoint"
)

func TestReceiveAndServeLocation(t *testing.T) {
	tr := &tracker{}
	server, client := net.Pipe()
	done := make(chan struct{})
	go func() { tr.receive(server); close(done) }()
	speed := 12.5
	now := time.Now().UTC().Truncate(time.Millisecond)
	point := datapoint.DataPoint{Timestamp: uint64(now.UnixMilli()), Lat: 41.8, Long: -87.6, Speed: &speed}
	raw, err := json.Marshal([]datapoint.DataPoint{point})
	if err != nil {
		t.Fatal(err)
	}
	if err = gob.NewEncoder(client).Encode(raw); err != nil {
		t.Fatal(err)
	}
	client.Close()
	<-done
	rr := httptest.NewRecorder()
	tr.handler().ServeHTTP(rr, httptest.NewRequest("GET", "/api/location", nil))
	var got location
	if err = json.Unmarshal(rr.Body.Bytes(), &got); err != nil {
		t.Fatal(err)
	}
	if rr.Code != 200 || got.Point.Lat != point.Lat || got.Point.Speed == nil || *got.Point.Speed != speed || !got.UpdatedAt.Equal(now) {
		t.Fatalf("unexpected location: %s", rr.Body.String())
	}
	// A delayed batch must not replace the current position.
	tr.accept([]datapoint.DataPoint{{Timestamp: uint64(now.Add(-time.Minute).UnixMilli()), Lat: 20}}, now)
	if tr.latest.Point.Lat != point.Lat {
		t.Fatal("older fix replaced current position")
	}
}

func TestEmptyInvalidAndMissingTimestamp(t *testing.T) {
	tr := &tracker{}
	rr := httptest.NewRecorder()
	tr.handler().ServeHTTP(rr, httptest.NewRequest("GET", "/api/location", nil))
	if rr.Body.String() != "null\n" {
		t.Fatal(rr.Body.String())
	}
	now := time.Now().UTC()
	tr.accept([]datapoint.DataPoint{{Lat: 91}, {Long: 181}, {Timestamp: uint64(now.Add(time.Hour).UnixMilli())}}, now)
	if tr.latest != nil {
		t.Fatal("accepted invalid point")
	}
	tr.accept([]datapoint.DataPoint{{Lat: 0, Long: 0}}, now)
	if tr.latest == nil || !tr.latest.UpdatedAt.Equal(now) {
		t.Fatal("missing timestamp should use receipt time")
	}
}