package handler
import (
"fmt"
"html"
"net/http"
"strings"
"unicode/utf8"
"soul-api/internal/config"
"soul-api/internal/database"
"soul-api/internal/model"
"github.com/gin-gonic/gin"
"gorm.io/gorm"
)
// H5ReadPage GET /read/:id 朋友圈/外部链接落地页
// 渲染文章预览内容（按 unpaid_preview_percent 截取），底部显示「打开小程序继续阅读」按钮
// 支持 ?ref=xxx 分销参数透传
func H5ReadPage(c *gin.Context) {
sectionID := c.Param("id")
if sectionID == "" {
c.Data(http.StatusBadRequest, "text/html; charset=utf-8", []byte(h5Error("缺少文章 ID")))
return
}
ref := c.Query("ref")
db := database.DB()
var ch model.Chapter
if err := db.Where("id = ?", sectionID).First(&ch).Error; err != nil {
if err == gorm.ErrRecordNotFound {
c.Data(http.StatusNotFound, "text/html; charset=utf-8", []byte(h5Error("文章不存在")))
return
}
c.Data(http.StatusInternalServerError, "text/html; charset=utf-8", []byte(h5Error("加载失败")))
return
}
percent := getUnpaidPreviewPercent(db)
preview := h5PreviewContent(ch.Content, percent)
title := ch.SectionTitle
if title == "" {
title = ch.ChapterTitle
}
partTitle := ""
if ch.PartTitle != "" {
partTitle = ch.PartTitle
}
chapterTitle := ""
if ch.ChapterTitle != "" && ch.ChapterTitle != title {
chapterTitle = ch.ChapterTitle
}
cfg := config.Get()
appID := cfg.WechatAppID
mpPath := fmt.Sprintf("pages/read/read?id=%s&action=pay", sectionID)
if ref != "" {
mpPath += "&ref=" + ref
}
pageHTML := h5BuildPage(h5PageData{
Title: title,
PartTitle: partTitle,
ChapterTitle: chapterTitle,
Preview: preview,
Percent: percent,
SectionID: sectionID,
Ref: ref,
AppID: appID,
MpPath: mpPath,
})
c.Data(http.StatusOK, "text/html; charset=utf-8", []byte(pageHTML))
}
func h5PreviewContent(content string, percent int) string {
total := utf8.RuneCountInString(content)
if total == 0 {
return ""
}
if percent < 1 {
percent = 1
}
if percent > 100 {
percent = 100
}
limit := total * percent / 100
if limit < 100 {
limit = 100
}
if limit > total {
limit = total
}
runes := []rune(content)
return string(runes[:limit])
}
func h5Error(msg string) string {
return fmt.Sprintf(`
提示
%s
`, html.EscapeString(msg))
}
type h5PageData struct {
Title, PartTitle, ChapterTitle string
Preview string
Percent int
SectionID, Ref string
AppID, MpPath string
}
func h5BuildPage(d h5PageData) string {
escapedTitle := html.EscapeString(d.Title)
escapedPart := html.EscapeString(d.PartTitle)
escapedChapter := html.EscapeString(d.ChapterTitle)
contentHTML := h5ContentToHTML(d.Preview)
subtitle := ""
if escapedPart != "" || escapedChapter != "" {
parts := []string{}
if escapedPart != "" {
parts = append(parts, escapedPart)
}
if escapedChapter != "" {
parts = append(parts, escapedChapter)
}
subtitle = fmt.Sprintf(`%s
`, strings.Join(parts, " · "))
}
mpBtn := fmt.Sprintf(
`
`,
html.EscapeString(d.AppID), html.EscapeString(d.MpPath))
return fmt.Sprintf(`
%s - 一场Soul的创业实验
已预览 %d%% · 打开小程序购买并阅读全文
%s
已复制，请打开微信
`,
escapedTitle, escapedTitle,
escapedTitle, subtitle,
contentHTML,
d.Percent, mpBtn,
html.EscapeString(d.SectionID))
}
func h5ContentToHTML(content string) string {
if content == "" {
return ""
}
if strings.HasPrefix(content, "<") && strings.Contains(content, "")
sb.WriteString(html.EscapeString(trimmed[4:]))
sb.WriteString("")
} else if strings.HasPrefix(trimmed, "## ") {
sb.WriteString("")
sb.WriteString(html.EscapeString(trimmed[3:]))
sb.WriteString("
")
} else if strings.HasPrefix(trimmed, "# ") {
sb.WriteString("")
sb.WriteString(html.EscapeString(trimmed[2:]))
sb.WriteString("
")
} else if strings.HasPrefix(trimmed, "> ") {
sb.WriteString("")
sb.WriteString(html.EscapeString(trimmed[2:]))
sb.WriteString("
")
} else {
sb.WriteString("")
sb.WriteString(html.EscapeString(trimmed))
sb.WriteString("
")
}
}
return sb.String()
}