package main

import (
	"io"
	"net/http"
	"net/http/httptest"
	"net/url"
	"testing"
	"time"
)

func chunk(date string, atMs int64, km, kwh float64, soh *float64) ConsumptionChunk {
	return ConsumptionChunk{
		InstallationID: testInstallation, Date: date, RecordedAt: time.UnixMilli(atMs),
		Day: Totals{Km: km, Kwh: kwh, Hours: km / 50, SocDrop: kwh / 0.6}, SohPercent: soh,
	}
}

func ptr(f float64) *float64 { return &f }

func TestAggregateDaysSumsPerDayNewestFirstWithRunningLifetime(t *testing.T) {
	days := aggregateDays([]ConsumptionChunk{
		chunk("2026-10-16", 1000, 10, 2, nil),
		chunk("2026-10-17", 3000, 5, 1, nil),
		chunk("2026-10-16", 2000, 20, 3, nil),
	})
	if len(days) != 2 || days[0].Date != "2026-10-17" || days[1].Date != "2026-10-16" {
		t.Fatalf("order: %+v", days)
	}
	if days[1].Day.Km != 30 || days[1].Day.Kwh != 5 || days[1].RecordedAt.UnixMilli() != 2000 {
		t.Fatalf("day sums: %+v", days[1])
	}
	if days[1].Lifetime.Km != 30 || days[0].Lifetime.Km != 35 || days[0].Lifetime.Kwh != 6 {
		t.Fatalf("lifetime: %+v / %+v", days[0].Lifetime, days[1].Lifetime)
	}
}

func TestAggregateDaysNewestSohWins(t *testing.T) {
	days := aggregateDays([]ConsumptionChunk{
		chunk("2026-10-16", 2000, 1, 1, ptr(96)),
		chunk("2026-10-16", 1000, 1, 1, ptr(98)),
		chunk("2026-10-17", 3000, 1, 1, nil),
	})
	if *days[1].SohPercent != 96 {
		t.Fatalf("want 96, got %v", *days[1].SohPercent)
	}
	if days[0].SohPercent != nil {
		t.Fatal("a day without SoH got one")
	}
}

func TestTlmSendsFlagsAsZeroOrOne(t *testing.T) {
	got := tlm(TelemetrySample{UTC: testNowS, Numbers: map[string]float64{"soc": 50},
		Flags: map[string]bool{"is_charging": true, "is_parked": false}})
	if got["utc"] != int64(testNowS) || got["soc"] != 50.0 || got["is_charging"] != 1 || got["is_parked"] != 0 {
		t.Fatalf("tlm %+v", got)
	}
}

func TestForwarderPicksOnlyTheNewestFreshSampleOncePerInterval(t *testing.T) {
	f := &Forwarder{MinInterval: 5 * time.Second}
	now := time.Unix(testNowS, 0)
	got, ok := f.pick([]TelemetrySample{{UTC: testNowS - 10}, {UTC: testNowS - 2}, {UTC: testNowS - 5}}, now)
	if !ok || got.UTC != testNowS-2 {
		t.Fatalf("picked %+v %v", got, ok)
	}
	if _, ok := f.pick([]TelemetrySample{{UTC: testNowS}}, now.Add(time.Second)); ok {
		t.Fatal("forwarded again within the interval")
	}
	if _, ok := f.pick([]TelemetrySample{{UTC: testNowS - 3}}, now.Add(time.Minute)); ok {
		t.Fatal("forwarded an older sample than the last one")
	}
	// A sample from ten minutes ago describes a car that has moved on.
	fresh := &Forwarder{MinInterval: 5 * time.Second}
	if _, ok := fresh.pick([]TelemetrySample{{UTC: testNowS - 600}}, now); ok {
		t.Fatal("forwarded a stale sample")
	}
}

func TestForwarderPutsCredentialsInTheBodyNotTheURL(t *testing.T) {
	received := make(chan *http.Request, 1)
	var form url.Values
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		body, _ := io.ReadAll(r.Body)
		form, _ = url.ParseQuery(string(body))
		received <- r
	}))
	defer srv.Close()
	f := &Forwarder{APIKey: "key-123", UserToken: "token-456", Endpoint: srv.URL + "/1/tlm/send"}
	if err := f.send(t.Context(), TelemetrySample{UTC: testNowS, Numbers: map[string]float64{"soc": 80}}); err != nil {
		t.Fatal(err)
	}
	r := <-received
	if r.URL.RawQuery != "" {
		t.Fatalf("credentials leaked into the URL: %s", r.URL.RawQuery)
	}
	if form.Get("api_key") != "key-123" || form.Get("token") != "token-456" || form.Get("tlm") != `{"soc":80,"utc":1790000000}` {
		t.Fatalf("form %v", form)
	}
}

func TestLoadConfigFailsClosed(t *testing.T) {
	env := map[string]string{
		"INFLUX_URL": "http://influxdb:8086", "INFLUX_TOKEN": "t", "INFLUX_ORG": "mg4",
		"INGEST_TOKEN": "0123456789abcdef01234567",
	}
	get := func(k string) string { return env[k] }
	c, err := loadConfig(get)
	if err != nil || c.listenAddr != ":8080" || c.influxBucket != "mg4" || c.abrpMinInterval != 5*time.Second {
		t.Fatalf("defaults: %+v %v", c, err)
	}
	env["INGEST_TOKEN"] = "short"
	if _, err := loadConfig(get); err == nil {
		t.Fatal("short ingest token accepted")
	}
	env["INGEST_TOKEN"] = "0123456789abcdef01234567"
	delete(env, "INFLUX_TOKEN")
	if _, err := loadConfig(get); err == nil {
		t.Fatal("missing InfluxDB token accepted")
	}
}