package bt

import (
	"bytes"
	"context"
	"log/slog"
	"reflect"
	"strings"
	"testing"
)

// TestQuietSloggerDropsWarnings: the library's warning chatter (the webseed
// 403/429 noise) is filtered out so it can't corrupt the live display, while a
// genuine error still gets through.
func TestQuietSloggerDropsWarnings(t *testing.T) {
	var buf bytes.Buffer
	lg := quietSlogger(&buf)

	lg.Warn("webseed request error", "err", "429 Too Many Requests")
	if buf.Len() != 0 {
		t.Errorf("warning leaked into output: %q", buf.String())
	}
	// anacrolix's webseed code logs via Log(ctx, level, ...); confirm that path is
	// filtered too, not just the Warn helper.
	lg.Log(context.Background(), slog.LevelWarn, "another warning")
	if buf.Len() != 0 {
		t.Errorf("Log-at-Warn leaked: %q", buf.String())
	}

	lg.Error("real failure")
	if !strings.Contains(buf.String(), "real failure") {
		t.Errorf("error was suppressed, want it kept: %q", buf.String())
	}
}

func TestParsePorts(t *testing.T) {
	tests := []struct {
		spec string
		want []int
	}{
		// port spec examples.
		{"6881,6885", []int{6881, 6885}},
		{"6881-6999", rangeInts(6881, 6999)},
		{"7000-7001,8000", []int{7000, 7001, 8000}},
		{"6881-6889,6999", append(rangeInts(6881, 6889), 6999)},
		// single bare port.
		{"6881", []int{6881}},
		// whitespace and empty fields are tolerated.
		{" 6881 , 6885 ", []int{6881, 6885}},
		{"6881,,6885", []int{6881, 6885}},
		// empty / all-bad specs yield nil.
		{"", nil},
		{",", nil},
		{"abc", nil},
		// out-of-range ports are dropped.
		{"0", nil},
		{"70000", nil},
		// a range that overruns 65535 keeps only the valid part.
		{"65534-65540", []int{65534, 65535}},
	}
	for _, tt := range tests {
		got := ParsePorts(tt.spec)
		if !reflect.DeepEqual(got, tt.want) {
			t.Errorf("ParsePorts(%q) = %v, want %v", tt.spec, got, tt.want)
		}
	}
}

func rangeInts(a, b int) []int {
	out := make([]int, 0, b-a+1)
	for i := a; i <= b; i++ {
		out = append(out, i)
	}
	return out
}