package main

import (
	"context"
	"encoding/base64"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/loyaly/behavision-desktop/internal/cloud"
	"github.com/loyaly/behavision-desktop/internal/local"
)

// Viewer mode: what the app shows on a computer that is signed in and is not
// itself watching any cameras.
//
// This is the friend's-Mac case, and before it existed the app was honest and
// useless: Live() and Cameras() read ONLY the engine on 127.0.0.1, so a laptop
// with no engine got "engine not reachable at http://127.0.0.1:8010" and
// "0 of 0 cameras" - on an account whose shops were running and recognising
// people the whole time. Signing in is what the person did; the app answered
// as if they had not.
//
// The engine here is a port nothing listens on, which is precisely what a PC
// with no engine is.
const noEngine = "http://127.0.0.1:1" // reserved, refuses immediately

func viewerApp(t *testing.T, srv *httptest.Server) *App {
	t.Helper()
	c := cloud.New(srv.URL)
	c.SetSession(cloud.Session{Token: "test-token"})
	return &App{
		ctx:   context.Background(),
		cloud: c,
		local: local.New(noEngine, "", ""),
	}
}

func TestLiveFallsBackToHeadOfficeWhenThereIsNoEngine(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		switch {
		case r.URL.Path == "/api/sites":
			// Two shops. One is fine, one is the Office1 case.
			w.Write([]byte(`[
			  {"slug":"a","name":"A","cameras_up":2,"cameras_total":2,"fraction_below_gate":0.10},
			  {"slug":"b","name":"B","cameras_up":1,"cameras_total":3,"fraction_below_gate":0.73}
			]`))
		case strings.HasPrefix(r.URL.Path, "/api/visits"):
			w.Write([]byte(`{"arrivals":[
			  {"visit_id":"v1","visitor_id":"p1","ref":"V-1","label":"Visitor 1","camera_id":"cam2","is_new_visitor":true},
			  {"visit_id":"v2","visitor_id":"p1","ref":"V-1","label":"Visitor 1","camera_id":"cam2"},
			  {"visit_id":"v3","camera_id":"entrance"}
			]}`))
		default:
			t.Errorf("unexpected request %s", r.URL.Path)
		}
	}))
	defer srv.Close()

	snap, err := viewerApp(t, srv).Live()
	if err != nil {
		t.Fatalf("Live: %v", err)
	}
	if !snap.Viewing {
		t.Fatal("the snapshot did not say it was a view of somewhere else")
	}
	if got := snap.Stats["cameras_up"]; got != 3 {
		t.Errorf("cameras_up = %v, want 3 summed across both shops", got)
	}
	if got := snap.Stats["cameras_total"]; got != 5 {
		t.Errorf("cameras_total = %v, want 5", got)
	}
	// The WORST site, never an average. Averaging 0.10 against 0.73 reports
	// 0.42 and hides the only shop anyone needs to go and fix - the same rule
	// the heartbeat already follows with worst_site.
	if got := snap.Stats["fraction_below_gate"]; got != 0.73 {
		t.Errorf("fraction_below_gate = %v, want the worst shop's 0.73", got)
	}
	// Three arrivals, two of them the same person, one unidentified. A visit
	// with no visitor_id is real footfall and an unknown person, so it counts
	// as a sighting and not as somebody known.
	g := snap.Stats["gallery"].(map[string]any)
	if g["identities"] != 1 || g["sightings"] != 3 {
		t.Errorf("gallery = %v, want 1 identity over 3 sightings", g)
	}
	if len(snap.Events) != 3 {
		t.Fatalf("got %d events, want 3", len(snap.Events))
	}
	if snap.Events[0]["type"] != "person.new" || snap.Events[1]["type"] != "person.seen" {
		t.Errorf("arrival types wrong: %v", snap.Events)
	}
}

// Nobody signed in: the local failure is the honest answer. There is nothing
// else to show, and the person is most likely setting this PC up - telling
// them about head office would be telling them about something they have not
// got to yet.
func TestLiveWithNoEngineAndNoSessionReportsTheEngine(t *testing.T) {
	a := &App{ctx: context.Background(), cloud: cloud.New("https://example.invalid"),
		local: local.New(noEngine, "", "")}
	if _, err := a.Live(); err == nil {
		t.Fatal("want the engine error, got nil")
	}
}

// A remote camera is flagged, because the screen has to withhold every button
// that would talk to a camera on a network this computer cannot reach. An Edit
// button that cannot work is worse than one that is absent.
func TestRemoteCamerasAreFlaggedAndCarryNoCredentials(t *testing.T) {
	jpeg := base64.StdEncoding.EncodeToString([]byte{0xFF, 0xD8, 0xFF, 0xD9})
	var shots int
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if strings.HasPrefix(r.URL.Path, "/api/camera-snapshots/") {
			shots++
			w.Header().Set("Content-Type", "image/jpeg")
			b, _ := base64.StdEncoding.DecodeString(jpeg)
			w.Write(b)
			return
		}
		w.Header().Set("Content-Type", "application/json")
		w.Write([]byte(`[
		  {"id":"c1","camera_id":"cam2","label":"Open office","site":"Coimbatore",
		   "connected":true,"snapshot_at":"2026-09-30T10:00:00Z",
		   "snapshot":{"available":true,"url":"/api/camera-snapshots/c1.jpg","auth":true}}
		]`))
	}))
	defer srv.Close()

	a := viewerApp(t, srv)
	cams, err := a.Cameras()
	if err != nil {
		t.Fatalf("Cameras: %v", err)
	}
	if len(cams) != 1 {
		t.Fatalf("got %d cameras, want 1", len(cams))
	}
	if cams[0]["remote"] != true {
		t.Error("the camera was not flagged remote")
	}
	// The RTSP details are a live path into the camera itself and the server
	// does not send them to a tenant at all. Nothing here may invent them.
	for _, k := range []string{"host", "port", "path", "username", "password"} {
		if _, ok := cams[0][k]; ok {
			t.Errorf("a remote camera carried %q", k)
		}
	}

	// The picture has to be fetched here: a webview <img> resolves a relative
	// src against wails:// and cannot send the session's bearer.
	shot := cams[0]["snapshot"].(cloud.Photo)
	if !strings.HasPrefix(shot.URL, "data:image/jpeg;base64,") || shot.Auth {
		t.Errorf("snapshot url = %q auth=%v, want an inline data URI", shot.URL, shot.Auth)
	}

	// And fetched ONCE. This screen polls every 8 seconds and a real snapshot
	// is ~90 KB, so re-fetching an unchanged picture is megabytes an hour to
	// redraw the same frame.
	if _, err := a.Cameras(); err != nil {
		t.Fatalf("second poll: %v", err)
	}
	if shots != 1 {
		t.Errorf("fetched the same snapshot %d times across two polls", shots)
	}
}