package main

import (
	"crypto/sha256"
	"encoding/hex"
	"html"
	"io"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"

	"./common"
)

// ? - Should we add a new permission or permission zone (like per-forum permissions) specifically for profile comment creation
// ? - Should we allow banned users to make reports? How should we handle report abuse?
// TODO: Add a permission to stop certain users from using custom avatars
// ? - Log username changes and put restrictions on this?

func routeTopicCreate(w http.ResponseWriter, r *http.Request, user common.User, sfid string) common.RouteError {
	var fid int
	var err error
	if sfid != "" {
		fid, err = strconv.Atoi(sfid)
		if err != nil {
			return common.LocalError("You didn't provide a valid number for the forum ID.", w, r, user)
		}
	}
	if fid == 0 {
		fid = common.Config.DefaultForum
	}

	headerVars, ferr := common.ForumUserCheck(w, r, &user, fid)
	if ferr != nil {
		return ferr
	}
	if !user.Perms.ViewTopic || !user.Perms.CreateTopic {
		return common.NoPermissions(w, r, user)
	}

	common.BuildWidgets("create_topic", nil, headerVars, r)

	// Lock this to the forum being linked?
	// Should we always put it in strictmode when it's linked from another forum? Well, the user might end up changing their mind on what forum they want to post in and it would be a hassle, if they had to switch pages, even if it is a single click for many (exc. mobile)
	var strictmode bool
	if common.Vhooks["topic_create_pre_loop"] != nil {
		common.RunVhook("topic_create_pre_loop", w, r, fid, &headerVars, &user, &strictmode)
	}

	// TODO: Re-add support for plugin_guilds
	var forumList []common.Forum
	var canSee []int
	if user.IsSuperAdmin {
		canSee, err = common.Fstore.GetAllVisibleIDs()
		if err != nil {
			return common.InternalError(err, w, r)
		}
	} else {
		group, err := common.Gstore.Get(user.Group)
		if err != nil {
			// TODO: Refactor this
			common.LocalError("Something weird happened behind the scenes", w, r, user)
			log.Printf("Group #%d doesn't exist, but it's set on common.User #%d", user.Group, user.ID)
			return nil
		}
		canSee = group.CanSee
	}

	// TODO: plugin_superadmin needs to be able to override this loop. Skip flag on topic_create_pre_loop?
	for _, ffid := range canSee {
		// TODO: Surely, there's a better way of doing this. I've added it in for now to support plugin_guilds, but we really need to clean this up
		if strictmode && ffid != fid {
			continue
		}

		// Do a bulk forum fetch, just in case it's the SqlForumStore?
		forum := common.Fstore.DirtyGet(ffid)
		if forum.Name != "" && forum.Active {
			fcopy := forum.Copy()
			if common.Hooks["topic_create_frow_assign"] != nil {
				// TODO: Add the skip feature to all the other row based hooks?
				if common.RunHook("topic_create_frow_assign", &fcopy).(bool) {
					continue
				}
			}
			forumList = append(forumList, fcopy)
		}
	}

	ctpage := common.CreateTopicPage{"Create Topic", user, headerVars, forumList, fid}
	if common.PreRenderHooks["pre_render_create_topic"] != nil {
		if common.RunPreRenderHook("pre_render_create_topic", w, r, &user, &ctpage) {
			return nil
		}
	}

	err = common.RunThemeTemplate(headerVars.ThemeName, "create-topic", ctpage, w)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	return nil
}

// POST functions. Authorised users only.
func routeTopicCreateSubmit(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	// TODO: Reduce this to 1MB for attachments for each file?
	if r.ContentLength > int64(common.Config.MaxRequestSize) {
		size, unit := common.ConvertByteUnit(float64(common.Config.MaxRequestSize))
		return common.CustomError("Your attachments are too big. Your files need to be smaller than "+strconv.Itoa(int(size))+unit+".", http.StatusExpectationFailed, "Error", w, r, user)
	}
	r.Body = http.MaxBytesReader(w, r.Body, int64(common.Config.MaxRequestSize))

	err := r.ParseMultipartForm(int64(common.Megabyte))
	if err != nil {
		return common.LocalError("Unable to parse the form", w, r, user)
	}

	fid, err := strconv.Atoi(r.PostFormValue("topic-board"))
	if err != nil {
		return common.LocalError("The provided ForumID is not a valid number.", w, r, user)
	}

	// TODO: Add hooks to make use of headerLite
	_, ferr := common.SimpleForumUserCheck(w, r, &user, fid)
	if ferr != nil {
		return ferr
	}
	if !user.Perms.ViewTopic || !user.Perms.CreateTopic {
		return common.NoPermissions(w, r, user)
	}

	topicName := html.EscapeString(r.PostFormValue("topic-name"))
	content := html.EscapeString(common.PreparseMessage(r.PostFormValue("topic-content")))
	tid, err := common.Topics.Create(fid, topicName, content, user.ID, user.LastIP)
	if err != nil {
		switch err {
		case common.ErrNoRows:
			return common.LocalError("Something went wrong, perhaps the forum got deleted?", w, r, user)
		case common.ErrNoTitle:
			return common.LocalError("This topic doesn't have a title", w, r, user)
		case common.ErrNoBody:
			return common.LocalError("This topic doesn't have a body", w, r, user)
		default:
			return common.InternalError(err, w, r)
		}
	}

	_, err = stmts.addSubscription.Exec(user.ID, tid, "topic")
	if err != nil {
		return common.InternalError(err, w, r)
	}

	err = user.IncreasePostStats(common.WordCount(content), true)
	if err != nil {
		return common.InternalError(err, w, r)
	}

	// Handle the file attachments
	// TODO: Stop duplicating this code
	if user.Perms.UploadFiles {
		files, ok := r.MultipartForm.File["upload_files"]
		if ok {
			if len(files) > 5 {
				return common.LocalError("You can't attach more than five files", w, r, user)
			}

			for _, file := range files {
				if common.Dev.DebugMode {
					log.Print("file.Filename ", file.Filename)
				}
				extarr := strings.Split(file.Filename, ".")
				if len(extarr) < 2 {
					return common.LocalError("Bad file", w, r, user)
				}
				ext := extarr[len(extarr)-1]

				// TODO: Can we do this without a regex?
				reg, err := regexp.Compile("[^A-Za-z0-9]+")
				if err != nil {
					return common.LocalError("Bad file extension", w, r, user)
				}
				ext = strings.ToLower(reg.ReplaceAllString(ext, ""))
				if !common.AllowedFileExts.Contains(ext) {
					return common.LocalError("You're not allowed to upload files with this extension", w, r, user)
				}

				infile, err := file.Open()
				if err != nil {
					return common.LocalError("Upload failed", w, r, user)
				}
				defer infile.Close()

				hasher := sha256.New()
				_, err = io.Copy(hasher, infile)
				if err != nil {
					return common.LocalError("Upload failed [Hashing Failed]", w, r, user)
				}
				infile.Close()

				checksum := hex.EncodeToString(hasher.Sum(nil))
				filename := checksum + "." + ext
				outfile, err := os.Create("." + "/attachs/" + filename)
				if err != nil {
					return common.LocalError("Upload failed [File Creation Failed]", w, r, user)
				}
				defer outfile.Close()

				infile, err = file.Open()
				if err != nil {
					return common.LocalError("Upload failed", w, r, user)
				}
				defer infile.Close()

				_, err = io.Copy(outfile, infile)
				if err != nil {
					return common.LocalError("Upload failed [Copy Failed]", w, r, user)
				}

				_, err = stmts.addAttachment.Exec(fid, "forums", tid, "topics", user.ID, filename)
				if err != nil {
					return common.InternalError(err, w, r)
				}
			}
		}
	}

	http.Redirect(w, r, "/topic/"+strconv.Itoa(tid), http.StatusSeeOther)
	return nil
}

func routeCreateReply(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	// TODO: Reduce this to 1MB for attachments for each file?
	// TODO: Reuse this code more
	if r.ContentLength > int64(common.Config.MaxRequestSize) {
		size, unit := common.ConvertByteUnit(float64(common.Config.MaxRequestSize))
		return common.CustomError("Your attachments are too big. Your files need to be smaller than "+strconv.Itoa(int(size))+unit+".", http.StatusExpectationFailed, "Error", w, r, user)
	}
	r.Body = http.MaxBytesReader(w, r.Body, int64(common.Config.MaxRequestSize))

	err := r.ParseMultipartForm(int64(common.Megabyte))
	if err != nil {
		return common.LocalError("Unable to parse the form", w, r, user)
	}

	tid, err := strconv.Atoi(r.PostFormValue("tid"))
	if err != nil {
		return common.PreError("Failed to convert the Topic ID", w, r)
	}

	topic, err := common.Topics.Get(tid)
	if err == ErrNoRows {
		return common.PreError("Couldn't find the parent topic", w, r)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}

	// TODO: Add hooks to make use of headerLite
	_, ferr := common.SimpleForumUserCheck(w, r, &user, topic.ParentID)
	if ferr != nil {
		return ferr
	}
	if !user.Perms.ViewTopic || !user.Perms.CreateReply {
		return common.NoPermissions(w, r, user)
	}

	// Handle the file attachments
	// TODO: Stop duplicating this code
	if user.Perms.UploadFiles {
		files, ok := r.MultipartForm.File["upload_files"]
		if ok {
			if len(files) > 5 {
				return common.LocalError("You can't attach more than five files", w, r, user)
			}

			for _, file := range files {
				log.Print("file.Filename ", file.Filename)
				extarr := strings.Split(file.Filename, ".")
				if len(extarr) < 2 {
					return common.LocalError("Bad file", w, r, user)
				}
				ext := extarr[len(extarr)-1]

				// TODO: Can we do this without a regex?
				reg, err := regexp.Compile("[^A-Za-z0-9]+")
				if err != nil {
					return common.LocalError("Bad file extension", w, r, user)
				}
				ext = strings.ToLower(reg.ReplaceAllString(ext, ""))
				if !common.AllowedFileExts.Contains(ext) {
					return common.LocalError("You're not allowed to upload files with this extension", w, r, user)
				}

				infile, err := file.Open()
				if err != nil {
					return common.LocalError("Upload failed", w, r, user)
				}
				defer infile.Close()

				hasher := sha256.New()
				_, err = io.Copy(hasher, infile)
				if err != nil {
					return common.LocalError("Upload failed [Hashing Failed]", w, r, user)
				}
				infile.Close()

				checksum := hex.EncodeToString(hasher.Sum(nil))
				filename := checksum + "." + ext
				outfile, err := os.Create("." + "/attachs/" + filename)
				if err != nil {
					return common.LocalError("Upload failed [File Creation Failed]", w, r, user)
				}
				defer outfile.Close()

				infile, err = file.Open()
				if err != nil {
					return common.LocalError("Upload failed", w, r, user)
				}
				defer infile.Close()

				_, err = io.Copy(outfile, infile)
				if err != nil {
					return common.LocalError("Upload failed [Copy Failed]", w, r, user)
				}

				_, err = stmts.addAttachment.Exec(topic.ParentID, "forums", tid, "replies", user.ID, filename)
				if err != nil {
					return common.InternalError(err, w, r)
				}
			}
		}
	}

	content := common.PreparseMessage(html.EscapeString(r.PostFormValue("reply-content")))
	_, err = common.Rstore.Create(topic, content, user.LastIP, user.ID)
	if err != nil {
		return common.InternalError(err, w, r)
	}

	err = common.Fstore.UpdateLastTopic(tid, user.ID, topic.ParentID)
	if err != nil && err != ErrNoRows {
		return common.InternalError(err, w, r)
	}

	res, err := stmts.addActivity.Exec(user.ID, topic.CreatedBy, "reply", "topic", tid)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	lastID, err := res.LastInsertId()
	if err != nil {
		return common.InternalError(err, w, r)
	}

	_, err = stmts.notifyWatchers.Exec(lastID)
	if err != nil {
		return common.InternalError(err, w, r)
	}

	// Alert the subscribers about this post without blocking this post from being posted
	if enableWebsockets {
		go notifyWatchers(lastID)
	}

	http.Redirect(w, r, "/topic/"+strconv.Itoa(tid), http.StatusSeeOther)

	wcount := common.WordCount(content)
	err = user.IncreasePostStats(wcount, false)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	return nil
}

// TODO: Refactor this
func routeLikeTopic(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	err := r.ParseForm()
	if err != nil {
		return common.PreError("Bad Form", w, r)
	}

	tid, err := strconv.Atoi(r.URL.Path[len("/topic/like/submit/"):])
	if err != nil {
		return common.PreError("Topic IDs can only ever be numbers.", w, r)
	}

	topic, err := common.Topics.Get(tid)
	if err == ErrNoRows {
		return common.PreError("The requested topic doesn't exist.", w, r)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}

	// TODO: Add hooks to make use of headerLite
	_, ferr := common.SimpleForumUserCheck(w, r, &user, topic.ParentID)
	if ferr != nil {
		return ferr
	}
	if !user.Perms.ViewTopic || !user.Perms.LikeItem {
		return common.NoPermissions(w, r, user)
	}
	if topic.CreatedBy == user.ID {
		return common.LocalError("You can't like your own topics", w, r, user)
	}

	_, err = common.Users.Get(topic.CreatedBy)
	if err != nil && err == ErrNoRows {
		return common.LocalError("The target user doesn't exist", w, r, user)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}

	score := 1
	err = topic.Like(score, user.ID)
	if err == common.ErrAlreadyLiked {
		return common.LocalError("You already liked this", w, r, user)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}

	res, err := stmts.addActivity.Exec(user.ID, topic.CreatedBy, "like", "topic", tid)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	lastID, err := res.LastInsertId()
	if err != nil {
		return common.InternalError(err, w, r)
	}

	_, err = stmts.notifyOne.Exec(topic.CreatedBy, lastID)
	if err != nil {
		return common.InternalError(err, w, r)
	}

	// Live alerts, if the poster is online and WebSockets is enabled
	_ = wsHub.pushAlert(topic.CreatedBy, int(lastID), "like", "topic", user.ID, topic.CreatedBy, tid)

	http.Redirect(w, r, "/topic/"+strconv.Itoa(tid), http.StatusSeeOther)
	return nil
}

func routeReplyLikeSubmit(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	err := r.ParseForm()
	if err != nil {
		return common.PreError("Bad Form", w, r)
	}

	rid, err := strconv.Atoi(r.URL.Path[len("/reply/like/submit/"):])
	if err != nil {
		return common.PreError("The provided Reply ID is not a valid number.", w, r)
	}

	reply, err := common.Rstore.Get(rid)
	if err == ErrNoRows {
		return common.PreError("You can't like something which doesn't exist!", w, r)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}

	var fid int
	err = stmts.getTopicFID.QueryRow(reply.ParentID).Scan(&fid)
	if err == ErrNoRows {
		return common.PreError("The parent topic doesn't exist.", w, r)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}

	// TODO: Add hooks to make use of headerLite
	_, ferr := common.SimpleForumUserCheck(w, r, &user, fid)
	if ferr != nil {
		return ferr
	}
	if !user.Perms.ViewTopic || !user.Perms.LikeItem {
		return common.NoPermissions(w, r, user)
	}
	if reply.CreatedBy == user.ID {
		return common.LocalError("You can't like your own replies", w, r, user)
	}

	_, err = common.Users.Get(reply.CreatedBy)
	if err != nil && err != ErrNoRows {
		return common.LocalError("The target user doesn't exist", w, r, user)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}

	err = reply.Like(user.ID)
	if err == common.ErrAlreadyLiked {
		return common.LocalError("You've already liked this!", w, r, user)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}

	res, err := stmts.addActivity.Exec(user.ID, reply.CreatedBy, "like", "post", rid)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	lastID, err := res.LastInsertId()
	if err != nil {
		return common.InternalError(err, w, r)
	}

	_, err = stmts.notifyOne.Exec(reply.CreatedBy, lastID)
	if err != nil {
		return common.InternalError(err, w, r)
	}

	// Live alerts, if the poster is online and WebSockets is enabled
	_ = wsHub.pushAlert(reply.CreatedBy, int(lastID), "like", "post", user.ID, reply.CreatedBy, rid)

	http.Redirect(w, r, "/topic/"+strconv.Itoa(reply.ParentID), http.StatusSeeOther)
	return nil
}

func routeProfileReplyCreate(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	if !user.Perms.ViewTopic || !user.Perms.CreateReply {
		return common.NoPermissions(w, r, user)
	}

	err := r.ParseForm()
	if err != nil {
		return common.LocalError("Bad Form", w, r, user)
	}
	uid, err := strconv.Atoi(r.PostFormValue("uid"))
	if err != nil {
		return common.LocalError("Invalid UID", w, r, user)
	}

	content := html.EscapeString(common.PreparseMessage(r.PostFormValue("reply-content")))
	_, err = common.Prstore.Create(uid, content, user.ID, user.LastIP)
	if err != nil {
		return common.InternalError(err, w, r)
	}

	if !common.Users.Exists(uid) {
		return common.LocalError("The profile you're trying to post on doesn't exist.", w, r, user)
	}

	http.Redirect(w, r, "/user/"+strconv.Itoa(uid), http.StatusSeeOther)
	return nil
}

func routeReportSubmit(w http.ResponseWriter, r *http.Request, user common.User, sitemID string) common.RouteError {
	itemID, err := strconv.Atoi(sitemID)
	if err != nil {
		return common.LocalError("Bad ID", w, r, user)
	}
	itemType := r.FormValue("type")

	var fid = 1
	var title, content string
	if itemType == "reply" {
		reply, err := common.Rstore.Get(itemID)
		if err == ErrNoRows {
			return common.LocalError("We were unable to find the reported post", w, r, user)
		} else if err != nil {
			return common.InternalError(err, w, r)
		}

		topic, err := common.Topics.Get(reply.ParentID)
		if err == ErrNoRows {
			return common.LocalError("We weren't able to find the topic the reported post is supposed to be in", w, r, user)
		} else if err != nil {
			return common.InternalError(err, w, r)
		}

		title = "Reply: " + topic.Title
		content = reply.Content + "\n\nOriginal Post: #rid-" + strconv.Itoa(itemID)
	} else if itemType == "user-reply" {
		userReply, err := common.Prstore.Get(itemID)
		if err == ErrNoRows {
			return common.LocalError("We weren't able to find the reported post", w, r, user)
		} else if err != nil {
			return common.InternalError(err, w, r)
		}

		err = stmts.getUserName.QueryRow(userReply.ParentID).Scan(&title)
		if err == ErrNoRows {
			return common.LocalError("We weren't able to find the profile the reported post is supposed to be on", w, r, user)
		} else if err != nil {
			return common.InternalError(err, w, r)
		}
		title = "Profile: " + title
		content = userReply.Content + "\n\nOriginal Post: @" + strconv.Itoa(userReply.ParentID)
	} else if itemType == "topic" {
		err = stmts.getTopicBasic.QueryRow(itemID).Scan(&title, &content)
		if err == ErrNoRows {
			return common.NotFound(w, r)
		} else if err != nil {
			return common.InternalError(err, w, r)
		}
		title = "Topic: " + title
		content = content + "\n\nOriginal Post: #tid-" + strconv.Itoa(itemID)
	} else {
		if common.Vhooks["report_preassign"] != nil {
			common.RunVhookNoreturn("report_preassign", &itemID, &itemType)
			return nil
		}
		// Don't try to guess the type
		return common.LocalError("Unknown type", w, r, user)
	}

	var count int
	err = stmts.reportExists.QueryRow(itemType + "_" + strconv.Itoa(itemID)).Scan(&count)
	if err != nil && err != ErrNoRows {
		return common.InternalError(err, w, r)
	}
	if count != 0 {
		return common.LocalError("Someone has already reported this!", w, r, user)
	}

	// TODO: Repost attachments in the reports forum, so that the mods can see them
	// ? - Can we do this via the TopicStore? Should we do a ReportStore?
	res, err := stmts.createReport.Exec(title, content, common.ParseMessage(content, 0, ""), user.ID, user.ID, itemType+"_"+strconv.Itoa(itemID))
	if err != nil {
		return common.InternalError(err, w, r)
	}

	lastID, err := res.LastInsertId()
	if err != nil {
		return common.InternalError(err, w, r)
	}

	err = common.Fstore.AddTopic(int(lastID), user.ID, fid)
	if err != nil && err != ErrNoRows {
		return common.InternalError(err, w, r)
	}

	http.Redirect(w, r, "/topic/"+strconv.FormatInt(lastID, 10), http.StatusSeeOther)
	return nil
}

func routeAccountEditCritical(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	headerVars, ferr := common.UserCheck(w, r, &user)
	if ferr != nil {
		return ferr
	}

	pi := common.Page{"Edit Password", user, headerVars, tList, nil}
	if common.PreRenderHooks["pre_render_account_own_edit_critical"] != nil {
		if common.RunPreRenderHook("pre_render_account_own_edit_critical", w, r, &user, &pi) {
			return nil
		}
	}
	err := common.Templates.ExecuteTemplate(w, "account-own-edit.html", pi)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	return nil
}

func routeAccountEditCriticalSubmit(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	headerVars, ferr := common.UserCheck(w, r, &user)
	if ferr != nil {
		return ferr
	}

	var realPassword, salt string
	currentPassword := r.PostFormValue("account-current-password")
	newPassword := r.PostFormValue("account-new-password")
	confirmPassword := r.PostFormValue("account-confirm-password")

	err := stmts.getPassword.QueryRow(user.ID).Scan(&realPassword, &salt)
	if err == ErrNoRows {
		return common.LocalError("Your account no longer exists.", w, r, user)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}

	err = common.CheckPassword(realPassword, currentPassword, salt)
	if err == common.ErrMismatchedHashAndPassword {
		return common.LocalError("That's not the correct password.", w, r, user)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}
	if newPassword != confirmPassword {
		return common.LocalError("The two passwords don't match.", w, r, user)
	}
	common.SetPassword(user.ID, newPassword)

	// Log the user out as a safety precaution
	common.Auth.ForceLogout(user.ID)

	headerVars.NoticeList = append(headerVars.NoticeList, "Your password was successfully updated")
	pi := common.Page{"Edit Password", user, headerVars, tList, nil}
	if common.PreRenderHooks["pre_render_account_own_edit_critical"] != nil {
		if common.RunPreRenderHook("pre_render_account_own_edit_critical", w, r, &user, &pi) {
			return nil
		}
	}
	err = common.Templates.ExecuteTemplate(w, "account-own-edit.html", pi)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	return nil
}

func routeAccountEditAvatar(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	headerVars, ferr := common.UserCheck(w, r, &user)
	if ferr != nil {
		return ferr
	}

	pi := common.Page{"Edit Avatar", user, headerVars, tList, nil}
	if common.PreRenderHooks["pre_render_account_own_edit_avatar"] != nil {
		if common.RunPreRenderHook("pre_render_account_own_edit_avatar", w, r, &user, &pi) {
			return nil
		}
	}
	err := common.Templates.ExecuteTemplate(w, "account-own-edit-avatar.html", pi)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	return nil
}

func routeAccountEditAvatarSubmit(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	if r.ContentLength > int64(common.Config.MaxRequestSize) {
		size, unit := common.ConvertByteUnit(float64(common.Config.MaxRequestSize))
		return common.CustomError("Your avatar's too big. Avatars must be smaller than "+strconv.Itoa(int(size))+unit, http.StatusExpectationFailed, "Error", w, r, user)
	}
	r.Body = http.MaxBytesReader(w, r.Body, int64(common.Config.MaxRequestSize))

	headerVars, ferr := common.UserCheck(w, r, &user)
	if ferr != nil {
		return ferr
	}

	err := r.ParseMultipartForm(int64(common.Megabyte))
	if err != nil {
		return common.LocalError("Upload failed", w, r, user)
	}

	var filename, ext string
	for _, fheaders := range r.MultipartForm.File {
		for _, hdr := range fheaders {
			infile, err := hdr.Open()
			if err != nil {
				return common.LocalError("Upload failed", w, r, user)
			}
			defer infile.Close()

			// We don't want multiple files
			// TODO: Check the length of r.MultipartForm.File and error rather than doing this x.x
			if filename != "" {
				if filename != hdr.Filename {
					os.Remove("./uploads/avatar_" + strconv.Itoa(user.ID) + "." + ext)
					return common.LocalError("You may only upload one avatar", w, r, user)
				}
			} else {
				filename = hdr.Filename
			}

			if ext == "" {
				extarr := strings.Split(hdr.Filename, ".")
				if len(extarr) < 2 {
					return common.LocalError("Bad file", w, r, user)
				}
				ext = extarr[len(extarr)-1]

				// TODO: Can we do this without a regex?
				reg, err := regexp.Compile("[^A-Za-z0-9]+")
				if err != nil {
					return common.LocalError("Bad file extension", w, r, user)
				}
				ext = reg.ReplaceAllString(ext, "")
				ext = strings.ToLower(ext)
			}

			outfile, err := os.Create("./uploads/avatar_" + strconv.Itoa(user.ID) + "." + ext)
			if err != nil {
				return common.LocalError("Upload failed [File Creation Failed]", w, r, user)
			}
			defer outfile.Close()

			_, err = io.Copy(outfile, infile)
			if err != nil {
				return common.LocalError("Upload failed [Copy Failed]", w, r, user)
			}
		}
	}

	err = user.ChangeAvatar("." + ext)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	user.Avatar = "/uploads/avatar_" + strconv.Itoa(user.ID) + "." + ext

	headerVars.NoticeList = append(headerVars.NoticeList, "Your avatar was successfully updated")
	pi := common.Page{"Edit Avatar", user, headerVars, tList, nil}
	if common.PreRenderHooks["pre_render_account_own_edit_avatar"] != nil {
		if common.RunPreRenderHook("pre_render_account_own_edit_avatar", w, r, &user, &pi) {
			return nil
		}
	}
	err = common.Templates.ExecuteTemplate(w, "account-own-edit-avatar.html", pi)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	return nil
}

func routeAccountEditUsername(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	headerVars, ferr := common.UserCheck(w, r, &user)
	if ferr != nil {
		return ferr
	}

	pi := common.Page{"Edit common.Username", user, headerVars, tList, user.Name}
	if common.PreRenderHooks["pre_render_account_own_edit_username"] != nil {
		if common.RunPreRenderHook("pre_render_account_own_edit_username", w, r, &user, &pi) {
			return nil
		}
	}
	err := common.Templates.ExecuteTemplate(w, "account-own-edit-username.html", pi)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	return nil
}

func routeAccountEditUsernameSubmit(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	headerVars, ferr := common.UserCheck(w, r, &user)
	if ferr != nil {
		return ferr
	}

	newUsername := html.EscapeString(r.PostFormValue("account-new-username"))
	err := user.ChangeName(newUsername)
	if err != nil {
		return common.LocalError("Unable to change the username. Does someone else already have this name?", w, r, user)
	}
	user.Name = newUsername

	headerVars.NoticeList = append(headerVars.NoticeList, "Your username was successfully updated")
	pi := common.Page{"Edit common.Username", user, headerVars, tList, nil}
	if common.PreRenderHooks["pre_render_account_own_edit_username"] != nil {
		if common.RunPreRenderHook("pre_render_account_own_edit_username", w, r, &user, &pi) {
			return nil
		}
	}
	err = common.Templates.ExecuteTemplate(w, "account-own-edit-username.html", pi)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	return nil
}

func routeAccountEditEmail(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	headerVars, ferr := common.UserCheck(w, r, &user)
	if ferr != nil {
		return ferr
	}

	email := common.Email{UserID: user.ID}
	var emailList []interface{}
	rows, err := stmts.getEmailsByUser.Query(user.ID)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	defer rows.Close()

	for rows.Next() {
		err := rows.Scan(&email.Email, &email.Validated, &email.Token)
		if err != nil {
			return common.InternalError(err, w, r)
		}

		if email.Email == user.Email {
			email.Primary = true
		}
		emailList = append(emailList, email)
	}
	err = rows.Err()
	if err != nil {
		return common.InternalError(err, w, r)
	}

	// Was this site migrated from another forum software? Most of them don't have multiple emails for a single user.
	// This also applies when the admin switches site.EnableEmails on after having it off for a while.
	if len(emailList) == 0 {
		email.Email = user.Email
		email.Validated = false
		email.Primary = true
		emailList = append(emailList, email)
	}

	if !common.Site.EnableEmails {
		headerVars.NoticeList = append(headerVars.NoticeList, "The mail system is currently disabled.")
	}
	pi := common.Page{"Email Manager", user, headerVars, emailList, nil}
	if common.PreRenderHooks["pre_render_account_own_edit_email"] != nil {
		if common.RunPreRenderHook("pre_render_account_own_edit_email", w, r, &user, &pi) {
			return nil
		}
	}
	err = common.Templates.ExecuteTemplate(w, "account-own-edit-email.html", pi)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	return nil
}

// TODO: Do a session check on this?
func routeAccountEditEmailTokenSubmit(w http.ResponseWriter, r *http.Request, user common.User, token string) common.RouteError {
	headerVars, ferr := common.UserCheck(w, r, &user)
	if ferr != nil {
		return ferr
	}

	email := common.Email{UserID: user.ID}
	targetEmail := common.Email{UserID: user.ID}
	var emailList []interface{}
	rows, err := stmts.getEmailsByUser.Query(user.ID)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	defer rows.Close()

	for rows.Next() {
		err := rows.Scan(&email.Email, &email.Validated, &email.Token)
		if err != nil {
			return common.InternalError(err, w, r)
		}

		if email.Email == user.Email {
			email.Primary = true
		}
		if email.Token == token {
			targetEmail = email
		}
		emailList = append(emailList, email)
	}
	err = rows.Err()
	if err != nil {
		return common.InternalError(err, w, r)
	}

	if len(emailList) == 0 {
		return common.LocalError("A verification email was never sent for you!", w, r, user)
	}
	if targetEmail.Token == "" {
		return common.LocalError("That's not a valid token!", w, r, user)
	}

	_, err = stmts.verifyEmail.Exec(user.Email)
	if err != nil {
		return common.InternalError(err, w, r)
	}

	// If Email Activation is on, then activate the account while we're here
	if headerVars.Settings["activation_type"] == 2 {
		err = user.Activate()
		if err != nil {
			return common.InternalError(err, w, r)
		}
	}

	if !common.Site.EnableEmails {
		headerVars.NoticeList = append(headerVars.NoticeList, "The mail system is currently disabled.")
	}
	headerVars.NoticeList = append(headerVars.NoticeList, "Your email was successfully verified")
	pi := common.Page{"Email Manager", user, headerVars, emailList, nil}
	if common.PreRenderHooks["pre_render_account_own_edit_email"] != nil {
		if common.RunPreRenderHook("pre_render_account_own_edit_email", w, r, &user, &pi) {
			return nil
		}
	}
	err = common.Templates.ExecuteTemplate(w, "account-own-edit-email.html", pi)
	if err != nil {
		return common.InternalError(err, w, r)
	}
	return nil
}

func routeLogout(w http.ResponseWriter, r *http.Request, user common.User) common.RouteError {
	if !user.Loggedin {
		return common.LocalError("You can't logout without logging in first.", w, r, user)
	}
	common.Auth.Logout(w, user.ID)
	http.Redirect(w, r, "/", http.StatusSeeOther)
	return nil
}

func routeShowAttachment(w http.ResponseWriter, r *http.Request, user common.User, filename string) common.RouteError {
	err := r.ParseForm()
	if err != nil {
		return common.PreError("Bad Form", w, r)
	}

	filename = common.Stripslashes(filename)
	var ext = filepath.Ext("./attachs/" + filename)
	//log.Print("ext ", ext)
	//log.Print("filename ", filename)
	if !common.AllowedFileExts.Contains(strings.TrimPrefix(ext, ".")) {
		return common.LocalError("Bad extension", w, r, user)
	}

	sectionID, err := strconv.Atoi(r.FormValue("sectionID"))
	if err != nil {
		return common.LocalError("The sectionID is not an integer", w, r, user)
	}
	var sectionTable = r.FormValue("sectionType")

	var originTable string
	var originID, uploadedBy int
	err = stmts.getAttachment.QueryRow(filename, sectionID, sectionTable).Scan(&sectionID, &sectionTable, &originID, &originTable, &uploadedBy, &filename)
	if err == ErrNoRows {
		return common.NotFound(w, r)
	} else if err != nil {
		return common.InternalError(err, w, r)
	}

	if sectionTable == "forums" {
		_, ferr := common.SimpleForumUserCheck(w, r, &user, sectionID)
		if ferr != nil {
			return ferr
		}
		if !user.Perms.ViewTopic {
			return common.NoPermissions(w, r, user)
		}
	} else {
		return common.LocalError("Unknown section", w, r, user)
	}

	if originTable != "topics" && originTable != "replies" {
		return common.LocalError("Unknown origin", w, r, user)
	}

	// TODO: Fix the problem where non-existent files aren't greeted with custom 404s on ServeFile()'s side
	http.ServeFile(w, r, "./attachs/"+filename)
	return nil
}