package api

import (
	"net/http"
	"strings"
	"testing"
	"unicode/utf8"
)

// PATCH 承载 OAuth / 安全设置变更,必须纳入审计;只读方法不留痕。
func TestIsWriteMethod(t *testing.T) {
	tests := []struct {
		method string
		want   bool
	}{
		{http.MethodPost, true},
		{http.MethodPut, true},
		{http.MethodPatch, true},
		{http.MethodDelete, true},
		{http.MethodGet, false},
		{http.MethodHead, false},
	}
	for _, tt := range tests {
		if got := isWriteMethod(tt.method); got != tt.want {
			t.Errorf("isWriteMethod(%s) = %v, want %v", tt.method, got, tt.want)
		}
	}
}

func TestTruncateLogField(t *testing.T) {
	tests := []struct {
		name string
		in   string
		max  int
		want string
	}{
		{name: "短串原样", in: "abc", max: 10, want: "abc"},
		{name: "ASCII 截断", in: "abcdef", max: 4, want: "abcd"},
		{name: "中文边界回退", in: "中文日志", max: 4, want: "中"},
		{name: "恰好落在边界", in: "中文", max: 3, want: "中"},
		{name: "emoji 拦腰", in: "a😀b", max: 3, want: "a"},
		{name: "超长 UA 不产非法序列", in: strings.Repeat("界", 200), max: 255, want: strings.Repeat("界", 85)},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := truncateLogField(tt.in, tt.max)
			if got != tt.want {
				t.Errorf("truncateLogField(%q, %d) = %q, want %q", tt.in, tt.max, got, tt.want)
			}
			if !utf8.ValidString(got) {
				t.Errorf("result %q is not valid UTF-8", got)
			}
		})
	}
}