//go:build windows

package main

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
	"unicode/utf8"
)

func TestLogRotationBoundedUTF8AndRestart(t *testing.T) {
	path := filepath.Join(t.TempDir(), "test.log")
	w, e := openRotatingLog(path, 256)
	if e != nil {
		t.Fatal(e)
	}
	for i := 0; i < 8; i++ {
		if e = w.Write(strings.Repeat("АБ", 40) + "\n"); e != nil {
			t.Fatal(e)
		}
	}
	if e = w.Write(strings.Repeat("Ж", 600)); e != nil {
		t.Fatal(e)
	}
	if e = w.Close(); e != nil {
		t.Fatal(e)
	}
	for _, p := range []string{path, path + ".1"} {
		data, e := os.ReadFile(p)
		if e != nil {
			t.Fatal(e)
		}
		if len(data) > 256 {
			t.Fatalf("unbounded log: %d bytes", len(data))
		}
		if !utf8.Valid(data) {
			t.Fatal("split a UTF-8 character")
		}
	}
	w, e = openRotatingLog(path, 256)
	if e != nil {
		t.Fatal(e)
	}
	if e = w.Write("LAST\n"); e != nil {
		t.Fatal(e)
	}
	w.Close()
	data, e := os.ReadFile(path)
	if e != nil || !strings.HasSuffix(string(data), "LAST\n") {
		t.Fatal("restart failed")
	}
	entries, _ := os.ReadDir(filepath.Dir(path))
	if len(entries) != 1 {
		t.Fatalf("unexpected files: %d", len(entries))
	}
}
func TestLogRejectsDirectoryAndClosedWriter(t *testing.T) {
	dir := t.TempDir()
	if w, e := openRotatingLog(dir, 256); e == nil {
		w.Close()
		t.Fatal("accepted a directory")
	}
	w, e := openRotatingLog(filepath.Join(dir, "x.log"), 256)
	if e != nil {
		t.Fatal(e)
	}
	w.Close()
	if e = w.Write("x"); e == nil {
		t.Fatal("silenced write after close")
	}
}