1 files changed, 198 insertions, 0 deletions
diff --git a/src/events/repo/message.rs b/src/events/repo/message.rs
new file mode 100644
index 0000000..f8bae2b
--- /dev/null
+++ b/src/events/repo/message.rs
@@ -0,0 +1,198 @@
+use sqlx::{sqlite::Sqlite, SqliteConnection, Transaction};
+
+use crate::{
+    clock::DateTime,
+    events::types::{self, Sequence},
+    repo::{
+        channel::{self, Channel},
+        login::{self, Login},
+        message::{self, Message},
+    },
+};
+
+pub trait Provider {
+    fn message_events(&mut self) -> Events;
+}
+
+impl<'c> Provider for Transaction<'c, Sqlite> {
+    fn message_events(&mut self) -> Events {
+        Events(self)
+    }
+}
+
+pub struct Events<'t>(&'t mut SqliteConnection);
+
+impl<'c> Events<'c> {
+    pub async fn create(
+        &mut self,
+        sender: &Login,
+        channel: &Channel,
+        body: &str,
+        sent_at: &DateTime,
+    ) -> Result<types::ChannelEvent, sqlx::Error> {
+        let sequence = self.assign_sequence(channel).await?;
+
+        let id = message::Id::generate();
+
+        let message = sqlx::query!(
+            r#"
+				insert into message
+					(id, channel, sequence, sender, body, sent_at)
+				values ($1, $2, $3, $4, $5, $6)
+				returning
+					id as "id: message::Id",
+                    sequence as "sequence: Sequence",
+					sender as "sender: login::Id",
+					body,
+					sent_at as "sent_at: DateTime"
+			"#,
+            id,
+            channel.id,
+            sequence,
+            sender.id,
+            body,
+            sent_at,
+        )
+        .map(|row| types::ChannelEvent {
+            sequence: row.sequence,
+            at: row.sent_at,
+            data: types::MessageEvent {
+                channel: channel.clone(),
+                sender: sender.clone(),
+                message: Message {
+                    id: row.id,
+                    body: row.body,
+                },
+            }
+            .into(),
+        })
+        .fetch_one(&mut *self.0)
+        .await?;
+
+        Ok(message)
+    }
+
+    pub async fn assign_sequence(&mut self, channel: &Channel) -> Result<Sequence, sqlx::Error> {
+        let next = sqlx::query_scalar!(
+            r#"
+                update channel
+                set last_sequence = last_sequence + 1
+                where id = $1
+                returning last_sequence as "next_sequence: Sequence"
+            "#,
+            channel.id,
+        )
+        .fetch_one(&mut *self.0)
+        .await?;
+
+        Ok(next)
+    }
+
+    pub async fn delete_expired(
+        &mut self,
+        channel: &Channel,
+        message: &message::Id,
+        sequence: Sequence,
+        deleted_at: &DateTime,
+    ) -> Result<types::ChannelEvent, sqlx::Error> {
+        sqlx::query_scalar!(
+            r#"
+                delete from message
+                where id = $1
+                returning 1 as "row: i64"
+            "#,
+            message,
+        )
+        .fetch_one(&mut *self.0)
+        .await?;
+
+        Ok(types::ChannelEvent {
+            sequence,
+            at: *deleted_at,
+            data: types::MessageDeletedEvent {
+                channel: channel.clone(),
+                message: message.clone(),
+            }
+            .into(),
+        })
+    }
+
+    pub async fn expired(
+        &mut self,
+        expire_at: &DateTime,
+    ) -> Result<Vec<(Channel, message::Id)>, sqlx::Error> {
+        let messages = sqlx::query!(
+            r#"
+                select
+                    channel.id as "channel_id: channel::Id",
+                    channel.name as "channel_name",
+                    channel.created_at as "channel_created_at: DateTime",
+                    message.id as "message: message::Id"
+                from message
+                    join channel on message.channel = channel.id
+                    join login as sender on message.sender = sender.id
+                where sent_at < $1
+            "#,
+            expire_at,
+        )
+        .map(|row| {
+            (
+                Channel {
+                    id: row.channel_id,
+                    name: row.channel_name,
+                    created_at: row.channel_created_at,
+                },
+                row.message,
+            )
+        })
+        .fetch_all(&mut *self.0)
+        .await?;
+
+        Ok(messages)
+    }
+
+    pub async fn replay(
+        &mut self,
+        channel: &Channel,
+        resume_at: Option<Sequence>,
+    ) -> Result<Vec<types::ChannelEvent>, sqlx::Error> {
+        let events = sqlx::query!(
+            r#"
+				select
+					message.id as "id: message::Id",
+                    sequence as "sequence: Sequence",
+					login.id as "sender_id: login::Id",
+					login.name as sender_name,
+					message.body,
+					message.sent_at as "sent_at: DateTime"
+				from message
+					join login on message.sender = login.id
+				where channel = $1
+					and coalesce(sequence > $2, true)
+				order by sequence asc
+			"#,
+            channel.id,
+            resume_at,
+        )
+        .map(|row| types::ChannelEvent {
+            sequence: row.sequence,
+            at: row.sent_at,
+            data: types::MessageEvent {
+                channel: channel.clone(),
+                sender: login::Login {
+                    id: row.sender_id,
+                    name: row.sender_name,
+                },
+                message: Message {
+                    id: row.id,
+                    body: row.body,
+                },
+            }
+            .into(),
+        })
+        .fetch_all(&mut *self.0)
+        .await?;
+
+        Ok(events)
+    }
+}