package logging

import (
	"bytes"
	"strings"
	"testing"
	"time"

	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

func TestTextEncoderProducesReadableSingleLine(t *testing.T) {
	var output bytes.Buffer
	core := zapcore.NewCore(newTextEncoder(time.UTC), zapcore.AddSync(&output), zapcore.DebugLevel)
	logger := zap.New(core)
	logger.Info("服务启动",
		zap.String("request_id", "req-1"),
		zap.String("empty", ""),
		zap.String("detail", "line1\nline2"),
	)

	got := output.String()
	if strings.ContainsAny(got, "{}") {
		t.Fatalf("output should not use JSON object syntax: %s", got)
	}
	if !strings.Contains(got, "INFO  | 服务启动 | request_id=req-1") {
		t.Fatalf("unexpected text output: %s", got)
	}
	if strings.Contains(got, "empty=") {
		t.Fatalf("empty fields should be omitted: %s", got)
	}
	if strings.Count(got, "\n") != 1 || !strings.Contains(got, `detail="line1\nline2"`) {
		t.Fatalf("output should remain one physical line: %q", got)
	}
}