package index

import (
	"path/filepath"
	"testing"

	"github.com/aisim/kb-cli/internal/graph"
)

func TestFTSSearch(t *testing.T) {
	tmpDir := t.TempDir()
	dbPath := filepath.Join(tmpDir, "test.db")

	store, err := Open(dbPath)
	if err != nil {
		t.Fatalf("Open failed: %v", err)
	}
	defer store.Close()

	// 插入测试数据
	store.InsertNode(&graph.Node{
		ID:      1,
		Path:    "FAQ/充装类/001-test.md",
		Title:   "充装问题排查",
		Section: "FAQ",
		Tags:    []string{"充装"},
		Content: "关于智能枪充装问题的排查方法",
	})
	store.InsertNode(&graph.Node{
		ID:      2,
		Path:    "知识/002-config.md",
		Title:   "充装规格配置",
		Section: "知识",
		Tags:    []string{"配置"},
		Content: "充装规格配置说明",
	})

	// 创建 FTS
	if err := store.CreateFTS(); err != nil {
		t.Fatalf("CreateFTS failed: %v", err)
	}
	if err := store.PopulateFTS(); err != nil {
		t.Fatalf("PopulateFTS failed: %v", err)
	}

	// 搜索 - FTS5 对中文按字符 tokenize，"充装" 两个节点都包含
	results, err := store.FTSSearch([]string{"充装"}, 10)
	if err != nil {
		t.Fatalf("FTSSearch failed: %v", err)
	}
	if len(results) < 1 {
		t.Errorf("result count = %d, want >= 1", len(results))
	}
}

// TestKeywordSearchASCII 覆盖 KeywordSearch 的 FTS 通道（ASCII 词 MATCH + rank 排序）
func TestKeywordSearchASCII(t *testing.T) {
	store, err := Open(filepath.Join(t.TempDir(), "test.db"))
	if err != nil {
		t.Fatalf("Open failed: %v", err)
	}
	defer store.Close()

	// 两个节点都含 "pump"，但 node1 标题也含（title 权重高 → rank 更靠前）
	store.InsertNode(&graph.Node{
		ID:      1,
		Path:    "知识/001-pump.md",
		Title:   "pump failure",
		Section: "知识",
		Content: "pump failure troubleshooting guide",
	})
	store.InsertNode(&graph.Node{
		ID:      2,
		Path:    "知识/002-valve.md",
		Title:   "valve config",
		Section: "知识",
		Content: "the pump is configured here",
	})
	if err := store.CreateFTS(); err != nil {
		t.Fatalf("CreateFTS failed: %v", err)
	}
	if err := store.PopulateFTS(); err != nil {
		t.Fatalf("PopulateFTS failed: %v", err)
	}

	results, err := store.KeywordSearch([]string{"pump"}, 10)
	if err != nil {
		t.Fatalf("KeywordSearch failed: %v", err)
	}
	if len(results) != 2 {
		t.Fatalf("result count = %d, want 2 (FTS 通道应命中两节点)", len(results))
	}
	// FTS 通道 rank 排序：标题含 pump 的 node1 应排第一
	if results[0].ID != 1 {
		t.Errorf("FTS rank 排序: 首位 = %d, want 1", results[0].ID)
	}
}

// TestKeywordSearchMixed 覆盖双通道混合（ASCII 走 FTS + CJK 走 LIKE，seen 去重）
func TestKeywordSearchMixed(t *testing.T) {
	store, err := Open(filepath.Join(t.TempDir(), "test.db"))
	if err != nil {
		t.Fatalf("Open failed: %v", err)
	}
	defer store.Close()

	store.InsertNode(&graph.Node{
		ID:      1,
		Path:    "FAQ/001-pump.md",
		Title:   "pump 补气",
		Section: "FAQ",
		Content: "pump 补气失败排查",
	})
	if err := store.CreateFTS(); err != nil {
		t.Fatalf("CreateFTS failed: %v", err)
	}
	if err := store.PopulateFTS(); err != nil {
		t.Fatalf("PopulateFTS failed: %v", err)
	}

	// 同一节点被两个通道命中 → 去重后只出现一次
	results, err := store.KeywordSearch([]string{"pump", "补气"}, 10)
	if err != nil {
		t.Fatalf("KeywordSearch failed: %v", err)
	}
	if len(results) != 1 {
		t.Fatalf("双通道去重: count = %d, want 1", len(results))
	}
	if results[0].ID != 1 {
		t.Errorf("命中节点 = %d, want 1", results[0].ID)
	}
}