package client

import (
	"context"
	"net/http"
	"net/http/httptest"
	"os"
	"strconv"
	"strings"
	"testing"
	"time"

	"gitea.libretechconsulting.com/rmcguire/wingbits/pkg/types/readsb"
)

// fixtures map a request path to a captured station response. The readsb files
// and the Wingbits files are reused from their respective type packages' testdata
// so there is a single source of truth for sample payloads.
var fixtures = map[string]string{
	"/readsb/aircraft.json": "../types/readsb/testdata/aircraft.json",
	"/data/aircraft.json":   "../types/readsb/testdata/aircraft.json",
	"/data/receiver.json":   "../types/readsb/testdata/receiver.json",
	"/data/stats.json":      "../types/readsb/testdata/stats.json",
	"/data/outline.json":    "../types/readsb/testdata/outline.json",
	"/network/diagnostics":  "../types/wingbits/testdata/diagnostics.json",
	"/tailscale/status":     "../types/wingbits/testdata/status.json",
	"/metrics":              "../types/wingbits/testdata/metrics.txt",
}

// newTestClient stands up an httptest server that serves the captured station
// fixtures from both the Wingbits (readsb/) and tar1090 (data/) roots.
func newTestClient(t *testing.T) *Client {
	t.Helper()
	mux := http.NewServeMux()
	for path, file := range fixtures {
		mux.HandleFunc(path, serveFile(file))
	}
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	host, port := splitHostPort(t, strings.TrimPrefix(srv.URL, "http://"))
	c, err := New(
		WithWingbitsEndpoint(Endpoint{Host: host, Port: port, DataPath: wingbitsReadsbPath}),
		WithTar1090Endpoint(Endpoint{Host: host, Port: port, DataPath: defaultDataPath}),
	)
	if err != nil {
		t.Fatal(err)
	}
	return c
}

func serveFile(file string) http.HandlerFunc {
	return func(w http.ResponseWriter, _ *http.Request) {
		b, err := os.ReadFile(file)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		w.Write(b)
	}
}

func splitHostPort(t *testing.T, hp string) (string, int) {
	t.Helper()
	h, p, ok := strings.Cut(hp, ":")
	if !ok {
		t.Fatalf("bad host:port %q", hp)
	}
	port, err := strconv.Atoi(p)
	if err != nil {
		t.Fatalf("bad port %q: %v", p, err)
	}
	return h, port
}

func TestClientReadsbEndpoints(t *testing.T) {
	c := newTestClient(t)
	ctx := context.Background()

	all, err := c.Aircraft(ctx)
	if err != nil || len(all.Aircraft) == 0 {
		t.Fatalf("aircraft: %v (%d)", err, len(all.Aircraft))
	}
	// Filters supplied to the query are applied before returning.
	pos, err := c.Aircraft(ctx, readsb.WithPosition())
	if err != nil {
		t.Fatal(err)
	}
	if len(pos.Aircraft) == 0 || len(pos.Aircraft) > len(all.Aircraft) {
		t.Errorf("filtered %d of %d", len(pos.Aircraft), len(all.Aircraft))
	}

	rc, err := c.Receiver(ctx)
	if err != nil || !rc.HasLocation() {
		t.Fatalf("receiver: %v", err)
	}
	if _, err := c.Stats(ctx); err != nil {
		t.Fatalf("stats: %v", err)
	}
	o, err := c.Outline(ctx)
	if err != nil || len(o.ActualRange.Last24h.Points) == 0 {
		t.Fatalf("outline: %v", err)
	}
}

func TestOutlineRequiresTar1090(t *testing.T) {
	c, err := New(WithWingbitsEndpoint(Endpoint{Host: "127.0.0.1"}))
	if err != nil {
		t.Fatal(err)
	}
	if _, err := c.Outline(context.Background()); err == nil {
		t.Error("expected error without tar1090 endpoint")
	}
}

func TestClientWingbitsEndpoints(t *testing.T) {
	c := newTestClient(t)
	ctx := context.Background()

	d, err := c.Diagnostics(ctx)
	if err != nil || d.Hostname == "" {
		t.Fatalf("diagnostics: %v", err)
	}
	if !d.AllReachable() {
		t.Error("expected fixture probes all reachable")
	}
	s, err := c.Status(ctx)
	if err != nil || s.Hostname == "" {
		t.Fatalf("status: %v", err)
	}
	m, err := c.Metrics(ctx)
	if err != nil {
		t.Fatalf("metrics: %v", err)
	}
	wb := m.Wingbits()
	if wb.Version == "" {
		t.Error("expected wingbits_version label")
	}
	if !wb.NATS.Connected {
		t.Error("expected NATS connected in fixture")
	}
	if wb.Beast.Received == 0 {
		t.Error("expected beast received counter")
	}
}

func TestClientRetry(t *testing.T) {
	// Fail with 503 for the first two attempts, then succeed; the client must
	// retry past the failures and return the eventual body.
	var hits int
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		if hits++; hits <= 2 {
			http.Error(w, "warming up", http.StatusServiceUnavailable)
			return
		}
		w.Write([]byte(`{}`))
	}))
	t.Cleanup(srv.Close)

	host, port := splitHostPort(t, strings.TrimPrefix(srv.URL, "http://"))
	c, err := New(
		WithWingbitsEndpoint(Endpoint{Host: host, Port: port}),
		WithRetry(RetryConfig{MaxRetries: 3, BaseDelay: time.Millisecond, MaxDelay: 5 * time.Millisecond}),
	)
	if err != nil {
		t.Fatal(err)
	}
	if _, err := c.Status(context.Background()); err != nil {
		t.Fatalf("status after retries: %v", err)
	}
	if hits != 3 {
		t.Fatalf("expected 3 attempts, got %d", hits)
	}
}

func TestClientRetryGivesUp(t *testing.T) {
	// A 404 is not retryable: the client must fail after a single attempt even
	// with retries configured.
	var hits int
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		hits++
		http.Error(w, "nope", http.StatusNotFound)
	}))
	t.Cleanup(srv.Close)

	host, port := splitHostPort(t, strings.TrimPrefix(srv.URL, "http://"))
	c, err := New(
		WithWingbitsEndpoint(Endpoint{Host: host, Port: port}),
		WithRetry(RetryConfig{MaxRetries: 3, BaseDelay: time.Millisecond}),
	)
	if err != nil {
		t.Fatal(err)
	}
	if _, err := c.Status(context.Background()); err == nil {
		t.Fatal("expected error on 404")
	}
	if hits != 1 {
		t.Fatalf("expected 1 attempt for non-retryable status, got %d", hits)
	}
}

func TestPollAircraft(t *testing.T) {
	c := newTestClient(t)
	ctx := t.Context()

	// A long interval means the iterator only yields its immediate first sample;
	// breaking out must stop polling cleanly (no goroutine, no hang).
	var got int
	for report, err := range c.PollAircraft(ctx, time.Hour, readsb.WithPosition()) {
		if err != nil || report == nil || len(report.Aircraft) == 0 {
			t.Fatalf("first poll bad: %v", err)
		}
		got++
		break
	}
	if got != 1 {
		t.Fatalf("expected exactly one sample before break, got %d", got)
	}
}