package logx

import (
	"log"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestSetupWritesFile(t *testing.T) {
	dir := t.TempDir()
	logDir := filepath.Join(dir, "logs")

	closer, err := Setup(logDir)
	if err != nil {
		t.Fatalf("Setup 失败: %v", err)
	}
	log.Printf("hello-logx-%d", 42)
	if err := closer.Close(); err != nil {
		t.Fatalf("关闭失败: %v", err)
	}

	entries, err := os.ReadDir(logDir)
	if err != nil || len(entries) != 1 {
		t.Fatalf("日志目录应有 1 个文件, 实际 %d: %v", len(entries), err)
	}
	data, err := os.ReadFile(filepath.Join(logDir, entries[0].Name()))
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(data), "hello-logx-42") {
		t.Fatalf("日志未落盘，文件内容: %q", string(data))
	}
}

func TestSetupCreatesFileImmediately(t *testing.T) {
	dir := t.TempDir()
	closer, err := Setup(dir)
	if err != nil {
		t.Fatal(err)
	}
	defer closer.Close()
	entries, err := os.ReadDir(dir)
	if err != nil || len(entries) != 1 {
		t.Fatalf("Setup 后应立刻存在当天日志文件: %v %d", err, len(entries))
	}
}