From a0d48d1a4b3a80281662573b6dea878908884be4 Mon Sep 17 00:00:00 2001
From: Frank Elsinga <frank@elsinga.de>
Date: Tue, 12 Sep 2023 21:23:09 +0200
Subject: [PATCH] removed the chat from the database

---
 server/backend/migration/20230826000000.go | 72 ++++++++++++++++++++++
 server/backend/migration/migration.go      |  1 +
 2 files changed, 73 insertions(+)
 create mode 100644 server/backend/migration/20230826000000.go

diff --git a/server/backend/migration/20230826000000.go b/server/backend/migration/20230826000000.go
new file mode 100644
index 00000000..5c8f88cb
--- /dev/null
+++ b/server/backend/migration/20230826000000.go
@@ -0,0 +1,72 @@
+package migration
+
+import (
+	"github.com/go-gormigrate/gormigrate/v2"
+	"gorm.io/gorm"
+)
+
+type device2stats struct {
+	ChatRoomsActivity  int `gorm:"column:ChatRoomsActivity;default 0;not null"`
+	ChatActivity       int `gorm:"column:ChatActivity;default 0;not null"`
+	WizNavChatActivity int `gorm:"column:WizNavChatActivity;default 0;not null"`
+}
+
+// migrate20230826000000
+// Removes all traces of the chat from the database.
+func (m TumDBMigrator) migrate20230826000000() *gormigrate.Migration {
+	return &gormigrate.Migration{
+		ID: "20230826000000",
+		Migrate: func(tx *gorm.DB) error {
+			// Remove tracking from device2stats
+			if err := tx.Migrator().DropColumn(&device2stats{}, "ChatRoomsActivity"); err != nil {
+				return err
+			}
+			if err := tx.Migrator().DropColumn(&device2stats{}, "ChatActivity"); err != nil {
+				return err
+			}
+			if err := tx.Migrator().DropColumn(&device2stats{}, "WizNavChatActivity"); err != nil {
+				return err
+			}
+
+			// Delete all tables
+			if err := tx.Migrator().DropTable("chat_message"); err != nil {
+				return err
+			}
+			if err := tx.Migrator().DropTable("chat_room2members"); err != nil {
+				return err
+			}
+			return tx.Migrator().DropTable("chat_room")
+		},
+		Rollback: func(tx *gorm.DB) error {
+			// Restore chat_room
+			if err := tx.Exec("create table chat_room(room int auto_increment primary key, name varchar(100) not null, semester varchar(3) null, constraint `Index 2` unique (semester, name));").Error; err != nil {
+				return err
+			}
+
+			// Add tracking from device2stats
+			if err := tx.Migrator().AutoMigrate(&device2stats{}); err != nil {
+				return err
+			}
+
+			// Restore chat_message
+			if err := tx.Exec("create table chat_message (message int auto_increment primary key, member int not null, room int not null, text longtext not null, created datetime not null, signature longtext not null, constraint FK_chat_message_chat_room foreign key (room) references chat_room (room) on update cascade on delete cascade, constraint chat_message_ibfk_1 foreign key (member) references member (member) on update cascade on delete cascade);").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("create index chat_message_b3c09425 on chat_message (member);").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("create index chat_message_ca20ebca on chat_message (room);").Error; err != nil {
+				return err
+			}
+
+			// Restore chat_room2members
+			if err := tx.Exec("create table chat_room2members(room2members int auto_increment primary key, room int not null, member int not null, constraint chatroom_id unique (room, member), constraint FK_chat_room2members_chat_room foreign key (room) references chat_room (room) on update cascade on delete cascade, constraint chat_room2members_ibfk_2 foreign key (member) references member (member) on update cascade on delete cascade );").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("create index chat_chatroom_members_29801a33 on chat_room2members (room);").Error; err != nil {
+				return err
+			}
+			return tx.Exec("create index chat_chatroom_members_b3c09425 on chat_room2members (member);").Error
+		},
+	}
+}
diff --git a/server/backend/migration/migration.go b/server/backend/migration/migration.go
index 1eab83f7..0c9f70a0 100644
--- a/server/backend/migration/migration.go
+++ b/server/backend/migration/migration.go
@@ -41,6 +41,7 @@ func (m TumDBMigrator) Migrate() error {
 		m.migrate20220713000000(),
 		m.migrate20221119131300(),
 		m.migrate20221210000000(),
+		m.migrate20230826000000(),
 		m.migrate2023090510000000(),
 		m.migrate20230912000000(),
 	})