From a7fbbfd6f974631eadebc6effca8ce7982592786 Mon Sep 17 00:00:00 2001
From: ax_rd <ax_rd@aisim.cn>
Date: Thu, 03 Sep 2026 12:51:40 +0800
Subject: [PATCH] fix: explore 段落命中两级回退(原词→展开词)+ expandKeywords 去重 + HardBudget 接入

---
 internal/search/explore_test.go |   59 ++++++++++++++++++++++++++++-
 cmd/explore.go                  |    3 +
 internal/search/explore.go      |   28 ++++++++++++--
 3 files changed, 83 insertions(+), 7 deletions(-)

diff --git a/cmd/explore.go b/cmd/explore.go
index 84152d6..eb808c3 100644
--- a/cmd/explore.go
+++ b/cmd/explore.go
@@ -78,8 +78,9 @@
 	if topN <= 0 && cfg.Explore.TopN > 0 {
 		topN = cfg.Explore.TopN
 	}
+	hardBudget := cfg.Explore.HardBudget // 0 = Explore 内部用缺省 32000
 
-	res, err := search.Explore(store, allKeywords, search.ExploreOptions{Budget: budget, TopN: topN})
+	res, err := search.Explore(store, allKeywords, search.ExploreOptions{Budget: budget, TopN: topN, HardBudget: hardBudget})
 	if err != nil {
 		return fmt.Errorf("explore 失败: %w", err)
 	}
diff --git a/internal/search/explore.go b/internal/search/explore.go
index 7ff127e..9645fe8 100644
--- a/internal/search/explore.go
+++ b/internal/search/explore.go
@@ -94,13 +94,23 @@
 			}
 		}
 	}
-	return out
+	// 去重保序(原词在前、展开词在后):避免 bigram 与原词重复时 text 分重复计权
+	var dedup []string
+	seen := make(map[string]bool, len(out))
+	for _, kw := range out {
+		if !seen[kw] {
+			seen[kw] = true
+			dedup = append(dedup, kw)
+		}
+	}
+	return dedup
 }
 
 // ExploreOptions explore 参数
 type ExploreOptions struct {
-	Budget int // 字节预算(0 = 用配置默认)
-	TopN   int // 0 = 用配置默认
+	Budget     int // 字节预算(0 = 用配置默认)
+	TopN       int // 0 = 用配置默认
+	HardBudget int // 字节硬上限(0 = 用代码缺省 32000)
 }
 
 // ExploredDoc 入选文档及其输出正文
@@ -131,7 +141,11 @@
 		budget = 16000 // 代码缺省(config 读取在 cmd 层完成)
 	}
 	if budget > 32000 {
-		budget = 32000 // 硬上限
+		budget = 32000 // 硬上限缺省
+	}
+	// 配置显式给出的硬上限优先(cmd 层读 config.yaml 的 explore.hard_budget)
+	if cfg.HardBudget > 0 && budget > cfg.HardBudget {
+		budget = cfg.HardBudget
 	}
 	topN := cfg.TopN
 	if topN <= 0 {
@@ -158,8 +172,14 @@
 		if err != nil || content == "" {
 			continue
 		}
+		// 两级回退:先用原词提取(精确);原词在任何段落都不连续出现时
+		//(复合 CJK 词常见:bigram 召回了文档,但原词不连续)回退到展开词提取,
+		// 避免大文档被 continue 静默丢弃、最终输出「未找到相关文档」。
 		body := extractRelevantParagraphs(content, keywords, perDoc)
 		if body == "" {
+			body = extractRelevantParagraphs(content, searchKeywords, perDoc)
+		}
+		if body == "" {
 			// 无命中段落但文档入选 → 整篇(若放得下),否则跳过
 			if len(content) <= perDoc {
 				body = content
diff --git a/internal/search/explore_test.go b/internal/search/explore_test.go
index 125fcac..1bba277 100644
--- a/internal/search/explore_test.go
+++ b/internal/search/explore_test.go
@@ -1,7 +1,12 @@
 package search
 
 import (
+	"path/filepath"
+	"strings"
 	"testing"
+
+	"github.com/aisim/kb-cli/internal/graph"
+	"github.com/aisim/kb-cli/internal/index"
 )
 
 // TestExploreParagraphExtraction 段落截取:只输出命中关键词的段落,整段不截半句
@@ -22,10 +27,10 @@
 	}
 }
 
-// TestExploreKeywordExpansion 长 CJK 词拆 bigram(原词保留,ASCII/短词不拆)
+// TestExploreKeywordExpansion 长 CJK 词拆 bigram(原词保留,ASCII/短词不拆;末尾去重保序)
 func TestExploreKeywordExpansion(t *testing.T) {
 	got := expandKeywords([]string{"电子秤补气失败", "补气", "abc"})
-	want := []string{"电子秤补气失败", "电子", "子秤", "秤补", "补气", "气失", "失败", "补气", "abc"}
+	want := []string{"电子秤补气失败", "电子", "子秤", "秤补", "补气", "气失", "失败", "abc"}
 	if len(got) != len(want) {
 		t.Fatalf("展开数量: got=%d want=%d (%v)", len(got), len(want), got)
 	}
@@ -43,3 +48,53 @@
 		t.Errorf("超预算段落应跳过: %q", got)
 	}
 }
+
+// TestExploreFallbackToExpanded 回归(审查 Important):单复合 CJK 词在大文档中
+// 原文不连续出现(bigram 召回入选,但原词在任何段落都不出现)时,
+// 段落截取必须回退到展开词,不能静默丢弃文档。
+func TestExploreFallbackToExpanded(t *testing.T) {
+	tmpDir := t.TempDir()
+	dbPath := filepath.Join(tmpDir, "test.db")
+	store, err := index.Open(dbPath)
+	if err != nil {
+		t.Fatalf("Open failed: %v", err)
+	}
+	defer store.Close()
+
+	// 大文档(> 2000 字节预算):某段落只含「电子秤补气」片段,不含完整原词「电子秤补气失败」
+	filler := strings.Repeat("填充段落内容,用于把文档撑过预算。\n", 60)
+	content := "# 称重故障排查\n\n" + filler + "\n## 称重故障\n\n电子秤补气 时先检查阀门,失败则断电重启。\n"
+
+	n := &graph.Node{
+		ID:      1,
+		Path:    "FAQ/称重/001-test.md",
+		Title:   "称重故障排查",
+		Section: "FAQ",
+		Content: content,
+	}
+	if _, err := store.InsertNode(n); err != nil {
+		t.Fatalf("InsertNode failed: %v", err)
+	}
+	if err := store.CreateFTS(); err != nil {
+		t.Fatalf("CreateFTS failed: %v", err)
+	}
+	if err := store.PopulateFTS(); err != nil {
+		t.Fatalf("PopulateFTS failed: %v", err)
+	}
+
+	// 原词提取必为空(内容里没有完整的「电子秤补气失败」)
+	if b := extractRelevantParagraphs(content, []string{"电子秤补气失败"}, 2000); b != "" {
+		t.Fatalf("前提不成立:原词提取应为空,got=%q", b)
+	}
+
+	res, err := Explore(store, []string{"电子秤补气失败"}, ExploreOptions{Budget: 2000, TopN: 5})
+	if err != nil {
+		t.Fatalf("Explore failed: %v", err)
+	}
+	if len(res.Docs) != 1 {
+		t.Fatalf("应召回 1 篇文档(bigram 命中),got=%d", len(res.Docs))
+	}
+	if !strings.Contains(res.Docs[0].Body, "电子秤补气") {
+		t.Errorf("回退展开词后应提取含片段段落: body=%q", res.Docs[0].Body)
+	}
+}

--
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