package handler

import "testing"

func TestExtractRenameProposal(t *testing.T) {
	cases := []struct {
		name       string
		body       string
		wantAlias  string
		wantReason string
		wantBody   string
	}{
		{
			name:      "无标记时原样返回",
			body:      "普通正文。",
			wantAlias: "",
			wantBody:  "普通正文。",
		},
		{
			name:       "带理由",
			body:       "已定位问题。\n\n<!-- agentmail:rename-session alias=\"fix-login-leak\" reason=\"是登录态泄漏\" -->",
			wantAlias:  "fix-login-leak",
			wantReason: "是登录态泄漏",
			wantBody:   "已定位问题。",
		},
		{
			name:      "无理由",
			body:      "<!-- agentmail:rename-session alias=\"cache-eval\" -->\n\n正文在后。",
			wantAlias: "cache-eval",
			wantBody:  "正文在后。",
		},
		{
			// Agent 在长回复里反复修正措辞，最后写下的才是它的结论
			name:      "多条只取最后一条",
			body:      "<!-- agentmail:rename-session alias=\"first\" -->\n中间\n<!-- agentmail:rename-session alias=\"second\" -->",
			wantAlias: "second",
			wantBody:  "中间",
		},
		{
			// 别名含 . / @ 会让三维地址切分歧义，normalizeAlias 改写为 -
			name:      "非法字符被规范化",
			body:      "<!-- agentmail:rename-session alias=\"fix login.leak/now\" -->",
			wantAlias: "fix-login-leak-now",
			wantBody:  "",
		},
		{
			// "new" 是寻址保留字
			name:      "保留字被改写",
			body:      "<!-- agentmail:rename-session alias=\"new\" -->",
			wantAlias: "session-new",
			wantBody:  "",
		},
		{
			// 规范化后为空 → 视为无提议，但标记仍要剥掉
			name:      "空别名视为无提议且剥掉标记",
			body:      "正文\n<!-- agentmail:rename-session alias=\"\" -->",
			wantAlias: "",
			wantBody:  "正文",
		},
		{
			name:      "多余空格容错",
			body:      "<!--   agentmail:rename-session   alias=\"ok-name\"   -->",
			wantAlias: "ok-name",
			wantBody:  "",
		},
	}

	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			p, body := extractRenameProposal(c.body)
			gotAlias := ""
			gotReason := ""
			if p != nil {
				gotAlias, gotReason = p.Alias, p.Reason
			}
			if gotAlias != c.wantAlias {
				t.Errorf("alias = %q，期望 %q", gotAlias, c.wantAlias)
			}
			if gotReason != c.wantReason {
				t.Errorf("reason = %q，期望 %q", gotReason, c.wantReason)
			}
			if body != c.wantBody {
				t.Errorf("剥标记后正文 = %q，期望 %q", body, c.wantBody)
			}
		})
	}
}

// 标记必须从入库正文里彻底消失：react-markdown 不解析 raw HTML，
// 留着会被转义成一行可见的乱码文本，而不是被渲染器吞掉。
func TestProposalMarkerNeverSurvivesInBody(t *testing.T) {
	bodies := []string{
		"<!-- agentmail:rename-session alias=\"a\" -->",
		"前\n<!-- agentmail:rename-session alias=\"a\" reason=\"r\" -->\n后",
		"<!-- agentmail:rename-session alias=\"\" -->", // 无效提议也要剥
	}
	for _, b := range bodies {
		_, out := extractRenameProposal(b)
		if renameProposalRe.MatchString(out) {
			t.Errorf("正文里仍残留标记：%q", out)
		}
	}
}

// 提议出来的别名必须能直接通过 PUT alias 的校验，
// 否则前端点「接受」时会拿到 400 —— 系统自己造出了自己拒绝的值。
func TestProposedAliasPassesValidation(t *testing.T) {
	inputs := []string{
		"fix login.leak",
		"new",
		"a@b/c",
		"  spaced  name  ",
		"正常中文别名",
	}
	for _, in := range inputs {
		p, _ := extractRenameProposal("<!-- agentmail:rename-session alias=\"" + in + "\" -->")
		if p == nil {
			continue // 规范化后为空，已按无提议处理
		}
		if err := validateSessionAlias(p.Alias); err != nil {
			t.Errorf("提议 %q → %q 未通过 validateSessionAlias: %v", in, p.Alias, err)
		}
	}
}

func TestReasonTruncatedOnUTF8Boundary(t *testing.T) {
	long := ""
	for i := 0; i < 100; i++ {
		long += "很长的理由"
	}
	p, _ := extractRenameProposal("<!-- agentmail:rename-session alias=\"x\" reason=\"" + long + "\" -->")
	if p == nil {
		t.Fatal("应当解析出提议")
	}
	if len(p.Reason) > 210 { // 200 + "..."
		t.Errorf("理由未截断：%d 字节", len(p.Reason))
	}
	for _, r := range p.Reason {
		if r == 0xFFFD {
			t.Fatal("截断产生了替换符，说明切在多字节字符中间")
		}
	}
}