[feature] Add back/next buttons to profiles for paging through statuses (#708)

* add GetAccountWebStatuses to db

* add WebStatusesGet func to processor

* don't add limit to next/prev links if 0

* take query params for next/prev statuses

* add separate next + prev links for convenience

* show 'nothing here' message if no statuses exist

* add back / next links to profiles

* allow paging down only

* go fmt ./...

* 'recent public toots' -> 'latest public toots'

1 files changed, 22 insertions, 7 deletions

diff --git a/internal/web/profile.go b/internal/web/profile.go
index ce3fe645b..542c015f1 100644
--- a/internal/web/profile.go
+++ b/internal/web/profile.go
@@ -36,6 +36,11 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/oauth"
 )
 
+const (
+	// MaxStatusIDKey is for specifying the maximum ID of the status to retrieve.
+	MaxStatusIDKey = "max_id"
+)
+
 func (m *Module) profileGETHandler(c *gin.Context) {
 	ctx := c.Request.Context()
 
@@ -78,10 +83,18 @@ func (m *Module) profileGETHandler(c *gin.Context) {
 		return
 	}
 
-	// get latest 10 top-level public statuses;
-	// ie., exclude replies and boosts, public only,
-	// with or without media
-	statusResp, errWithCode := m.processor.AccountStatusesGet(ctx, authed, account.ID, 10, true, true, "", "", false, false, true)
+	// we should only show the 'back to top' button if the
+	// profile visitor is paging through statuses
+	showBackToTop := false
+
+	maxStatusID := ""
+	maxStatusIDString := c.Query(MaxStatusIDKey)
+	if maxStatusIDString != "" {
+		maxStatusID = maxStatusIDString
+		showBackToTop = true
+	}
+
+	statusResp, errWithCode := m.processor.AccountWebStatusesGet(ctx, account.ID, maxStatusID)
 	if errWithCode != nil {
 		api.ErrorHandler(c, errWithCode, instanceGet)
 		return
@@ -103,9 +116,11 @@ func (m *Module) profileGETHandler(c *gin.Context) {
 	}
 
 	c.HTML(http.StatusOK, "profile.tmpl", gin.H{
-		"instance": instance,
-		"account":  account,
-		"statuses": statusResp.Items,
+		"instance":         instance,
+		"account":          account,
+		"statuses":         statusResp.Items,
+		"statuses_next":    statusResp.NextLink,
+		"show_back_to_top": showBackToTop,
 		"stylesheets": []string{
 			"/assets/Fork-Awesome/css/fork-awesome.min.css",
 			"/assets/dist/status.css",