package main

import (
	"context"
	"net"
	"strconv"
	"strings"
	"testing"
	"time"

	"github.com/kami/maven/internal/config"
	"github.com/kami/maven/internal/ipc"
	"github.com/kami/maven/internal/phraser"
	"github.com/kami/maven/internal/router"
)

func TestWireNetScanOffUnlessEnabled(t *testing.T) {
	for name, cfg := range map[string]*config.Config{
		"no block": {},
		"written but dark": {NetScan: &config.NetScanConfig{
			Subnets: []string{"192.168.1.0/24"},
		}},
		"enabled but nothing to scan": {NetScan: &config.NetScanConfig{Enabled: true}},
		"enabled but public": {NetScan: &config.NetScanConfig{
			Subnets: []string{"8.8.8.0/24"}, Enabled: true,
		}},
		"enabled but far too wide": {NetScan: &config.NetScanConfig{
			Subnets: []string{"10.0.0.0/8"}, Enabled: true,
		}},
	} {
		t.Run(name, func(t *testing.T) {
			if w := wireNetScan(cfg, nil); w != nil {
				t.Fatal("the scanner must not wire for this config")
			}
		})
	}

	var w *netWiring
	if _, ok := w.scanSummary(context.Background()); ok {
		t.Fatal("a nil wiring must not claim a query")
	}

	ok := wireNetScan(&config.Config{NetScan: &config.NetScanConfig{
		Subnets: []string{"192.168.1.0/24"}, Enabled: true,
	}}, nil)
	if ok == nil {
		t.Fatal("a valid enabled block should wire")
	}
}

// A loopback /32 with nothing listening on the scanned port: the summary must
// come back honest rather than inventing a host. This also exercises the real
// dialer end to end without touching anything outside this box.
func TestScanSummaryOnAnEmptyRange(t *testing.T) {
	w := wireNetScan(&config.Config{NetScan: &config.NetScanConfig{
		// Port 1 on loopback: nothing listens and the connection is refused
		// immediately, so the scan is fast and touches only this machine.
		Subnets: []string{"127.0.0.1/32"}, Ports: []int{1}, Rate: 1000, Enabled: true,
	}}, nil)
	if w == nil {
		t.Fatal("wireNetScan returned nil")
	}
	out, claimed := w.scanSummary(context.Background())
	if !claimed {
		t.Fatal("the summary did not claim the turn")
	}
	if out == "" {
		t.Fatal("empty summary")
	}
	// Persona: feminine self-reference, informal address, no pet names.
	low := strings.ToLower(out)
	for _, bad := range []string{"нашёл", "не смог ", "вы ", "ваш", "милый", "дорогой"} {
		if strings.Contains(low, bad) {
			t.Errorf("persona violation %q in %q", bad, out)
		}
	}
}

func TestIsNetworkQuery(t *testing.T) {
	yes := []string{
		"какие устройства в сети?",
		"кто в сети?",
		"просканируй сеть",
		"покажи устройства в локальной сети",
		"сколько машин в сети",
	}
	no := []string{
		"",
		"интернет не работает",
		"сеть какая-то медленная",
		"я в сети инстаграма",
		"что включено дома?",
		"напомни оплатить интернет",
	}
	for _, u := range yes {
		if !isNetworkQuery(u) {
			t.Errorf("isNetworkQuery(%q) = false, want true", u)
		}
	}
	for _, u := range no {
		if isNetworkQuery(u) {
			t.Errorf("isNetworkQuery(%q) = true, want false", u)
		}
	}
}

// notingAPI counts the notes a scan writes, and remembers the last one.
type notingAPI struct {
	ipc.CoreAPI
	n    int
	last string
}

func (a *notingAPI) WriteNote(_ context.Context, _ time.Time, text string, _ []float32, _ string) (int64, error) {
	a.n++
	a.last = text
	return int64(a.n), nil
}

// The spoken answer must not be a list of IP addresses. It goes to piper as
// well as to /chat, and six dotted quads read out as a digit stream is not an
// answer anybody can use. The addresses belong in the written record.
func TestScanSummarySpeaksACountAndWritesTheAddresses(t *testing.T) {
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatal(err)
	}
	defer ln.Close()
	_, portStr, _ := net.SplitHostPort(ln.Addr().String())
	port, _ := strconv.Atoi(portStr)

	api := &notingAPI{}
	w := wireNetScan(&config.Config{NetScan: &config.NetScanConfig{
		Subnets: []string{"127.0.0.1/32"}, Ports: []int{port}, Rate: 1000, Enabled: true,
	}}, api)
	if w == nil {
		t.Fatal("wireNetScan returned nil")
	}
	out, claimed := w.scanSummary(context.Background())
	if !claimed {
		t.Fatal("the summary did not claim the turn")
	}
	if strings.Contains(out, "127.0.0.1") || strings.Contains(out, portStr) {
		t.Errorf("the spoken reply reads addresses out loud: %q", out)
	}
	if !strings.Contains(out, "нашла 1 устройство") {
		t.Errorf("reply = %q, want a count", out)
	}
	if api.n != 1 {
		t.Fatalf("wrote %d notes, want 1", api.n)
	}
	if !strings.Contains(api.last, "127.0.0.1") {
		t.Errorf("the written record has no addresses: %q", api.last)
	}

	// A follow-up question inside the TTL reuses the answer: two questions in
	// a row must not be two sweeps of the LAN.
	if _, _ = w.scanSummary(context.Background()); api.n != 1 {
		t.Errorf("a repeat question rescanned and rewrote the record (%d notes)", api.n)
	}
}

// An unconfigured scanner names the gap instead of declining the turn.
//
// Falling through sent "какие устройства в сети?" to the search leg, which
// answered with a paragraph about routers in general — and put a question about
// his own LAN on an upstream engine, which the personal boundary exists to
// prevent (Vikunja #479).
func TestQueryNetworkNamesTheGapWhenNotConfigured(t *testing.T) {
	h := &reactiveHandler{}
	reply, ok := h.queryNetwork(context.Background(), &queryTurn{
		dec: router.Decision{Utterance: "какие устройства в сети?"},
	})
	if !ok {
		t.Fatal("an unconfigured scanner let the question fall through to search")
	}
	if !phraser.IsQ(phraser.QueryNetOff, nil, reply) {
		t.Errorf("got %q, want the gap named", reply)
	}
}