threadr-rewritten/handlers/thread.go

package handlers

import (
    "log"
    "net/http"
    "strconv"
    "threadr/models"
    "github.com/gorilla/sessions"
)

func ThreadHandler(app *App) http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        session := r.Context().Value("session").(*sessions.Session)
        loggedIn := session.Values["user_id"] != nil
        userID, _ := session.Values["user_id"].(int)
        cookie, _ := r.Cookie("threadr_cookie_banner")

        threadIDStr := r.URL.Query().Get("id")
        threadID, err := strconv.Atoi(threadIDStr)
        if err != nil {
            http.Error(w, "Invalid thread ID", http.StatusBadRequest)
            return
        }

        thread, err := models.GetThreadByID(app.DB, threadID)
        if err != nil {
            log.Printf("Error fetching thread: %v", err)
            http.Error(w, "Internal Server Error", http.StatusInternalServerError)
            return
        }
        if thread == nil {
            http.Error(w, "Thread not found", http.StatusNotFound)
            return
        }

        board, err := models.GetBoardByID(app.DB, thread.BoardID)
        if err != nil {
            log.Printf("Error fetching board: %v", err)
            http.Error(w, "Internal Server Error", http.StatusInternalServerError)
            return
        }
        if board.Private {
            if !loggedIn {
                http.Redirect(w, r, app.Config.ThreadrDir+"/login/", http.StatusFound)
                return
            }
            hasPerm, err := models.HasBoardPermission(app.DB, userID, board.ID, models.PermViewBoard)
            if err != nil {
                log.Printf("Error checking permission: %v", err)
                http.Error(w, "Internal Server Error", http.StatusInternalServerError)
                return
            }
            if !hasPerm {
                http.Error(w, "You do not have permission to view this board", http.StatusForbidden)
                return
            }
        }

        if r.Method == http.MethodPost && loggedIn {
            action := r.URL.Query().Get("action")
            if action == "submit" {
                content := r.FormValue("content")
                replyToStr := r.URL.Query().Get("to")
                replyTo := 0
                if replyToStr != "" {
                    replyTo, err = strconv.Atoi(replyToStr)
                    if err != nil {
                        http.Error(w, "Invalid reply_to ID", http.StatusBadRequest)
                        return
                    }
                }
                if content == "" {
                    http.Error(w, "Content cannot be empty", http.StatusBadRequest)
                    return
                }
                if board.Private {
                    hasPerm, err := models.HasBoardPermission(app.DB, userID, board.ID, models.PermPostInBoard)
                    if err != nil {
                        log.Printf("Error checking permission: %v", err)
                        http.Error(w, "Internal Server Error", http.StatusInternalServerError)
                        return
                    }
                    if !hasPerm {
                        http.Error(w, "You do not have permission to post in this board", http.StatusForbidden)
                        return
                    }
                }
                post := models.Post{
                    ThreadID: threadID,
                    UserID:   userID,
                    Content:  content,
                    ReplyTo:  replyTo,
                }
                err = models.CreatePost(app.DB, post)
                if err != nil {
                    log.Printf("Error creating post: %v", err)
                    http.Error(w, "Failed to create post", http.StatusInternalServerError)
                    return
                }
                http.Redirect(w, r, app.Config.ThreadrDir+"/thread/?id="+threadIDStr, http.StatusFound)
                return
            }
        }

        posts, err := models.GetPostsByThreadID(app.DB, threadID)
        if err != nil {
            log.Printf("Error fetching posts: %v", err)
            http.Error(w, "Internal Server Error", http.StatusInternalServerError)
            return
        }

        if thread.Type == "chat" {
            for i, j := 0, len(posts)-1; i < j; i, j = i+1, j-1 {
                posts[i], posts[j] = posts[j], posts[i]
            }
        }

        data := struct {
            PageData
            Thread models.Thread
            Posts  []models.Post
        }{
            PageData: PageData{
                Title:            "ThreadR - " + thread.Title,
                Navbar:           "boards",
                LoggedIn:         loggedIn,
                ShowCookieBanner: cookie == nil || cookie.Value != "accepted",
                BasePath:         app.Config.ThreadrDir,
                StaticPath:       app.Config.ThreadrDir + "/static",
                CurrentURL:       r.URL.Path,
            },
            Thread: *thread,
            Posts:  posts,
        }
        if err := app.Tmpl.ExecuteTemplate(w, "thread", data); err != nil {
            log.Printf("Error executing template in ThreadHandler: %v", err)
            http.Error(w, "Internal Server Error", http.StatusInternalServerError)
            return
        }
    }
}