package handler

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

	"soul-api/internal/database"
	"soul-api/internal/model"

	"github.com/gin-gonic/gin"
)

// escapeLike 转义 LIKE 中的 % _ \，防止注入与通配符滥用
func escapeLike(s string) string {
	s = strings.ReplaceAll(s, "\\", "\\\\")
	s = strings.ReplaceAll(s, "%", "\\%")
	s = strings.ReplaceAll(s, "_", "\\_")
	return s
}

// SearchGet GET /api/search?q= 从 chapters 表搜索（GORM，参数化）
func SearchGet(c *gin.Context) {
	q := strings.TrimSpace(c.Query("q"))
	if q == "" {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "请输入搜索关键词"})
		return
	}
	pattern := "%" + escapeLike(q) + "%"
	var list []model.Chapter
	err := database.DB().Model(&model.Chapter{}).
		Where("section_title LIKE ? OR content LIKE ?", pattern, pattern).
		Order("sort_order ASC, id ASC").
		Limit(50).
		Find(&list).Error
	if err != nil {
		c.JSON(http.StatusOK, gin.H{"success": true, "data": gin.H{"keyword": q, "total": 0, "results": []interface{}{}}})
		return
	}
	lowerQ := strings.ToLower(q)
	results := make([]gin.H, 0, len(list))
	for _, ch := range list {
		matchType := "content"
		score := 5
		if strings.Contains(strings.ToLower(ch.SectionTitle), lowerQ) {
			matchType = "title"
			score = 10
		}
		snippet := ""
		pos := strings.Index(strings.ToLower(ch.Content), lowerQ)
		if pos >= 0 && len(ch.Content) > 0 {
			start := pos - 50
			if start < 0 {
				start = 0
			}
			end := pos + utf8.RuneCountInString(q) + 50
			if end > len(ch.Content) {
				end = len(ch.Content)
			}
			snippet = ch.Content[start:end]
			if start > 0 {
				snippet = "..." + snippet
			}
			if end < len(ch.Content) {
				snippet = snippet + "..."
			}
		}
		price := 1.0
		if ch.Price != nil {
			price = *ch.Price
		}
		results = append(results, gin.H{
			"id": ch.ID, "title": ch.SectionTitle, "partTitle": ch.PartTitle, "chapterTitle": ch.ChapterTitle,
			"price": price, "isFree": ch.IsFree, "matchType": matchType, "score": score, "snippet": snippet,
		})
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"data":    gin.H{"keyword": q, "total": len(results), "results": results},
	})
}