Initial commit

src/db.rs

@@ -0,0 +1,53 @@
+use chrono::{DateTime, NaiveDateTime, TimeZone, Utc};
+use diesel::Queryable;
+
+use crate::appointment::Appointment;
+
+#[derive(Queryable)]
+pub struct DbChat {
+	_id: i32,
+	telegram_id: i64,
+	calendar: String,
+	next_appointment_start: Option<i64>,
+	next_appointment_end: Option<i64>,
+	last_reminder: Option<i64>,
+	pinned_message: Option<i32>,
+}
+
+pub struct ChatInfo<Tz: TimeZone> {
+	pub id: i64,
+	pub calendar: String,
+	pub next_appointment: Option<Appointment<Tz>>,
+	pub last_reminder: Option<DateTime<Tz>>,
+	pub pinned_message_id: Option<i32>,
+}
+
+impl From<DbChat> for ChatInfo<Utc> {
+	fn from(db_chat: DbChat) -> Self {
+		let next_appointment = db_chat
+			.next_appointment_start
+			// Join appointments into single option
+			.and_then(|start| Some([start, db_chat.next_appointment_end?]))
+			// Convert timestamps to datetimes
+			.map(|timestamps| {
+				timestamps
+					.map(|timestamp| NaiveDateTime::from_timestamp(timestamp, 0))
+					.map(|date_time| DateTime::<Utc>::from_utc(date_time, Utc))
+			})
+			// Join datetimes into Appointment
+			.map(|[start, end]| Appointment { start, end });
+
+		let last_reminder = db_chat
+			.last_reminder
+			.map(|timestamp| NaiveDateTime::from_timestamp(timestamp, 0))
+			.map(|date_time| DateTime::<Utc>::from_utc(date_time, Utc));
+
+		ChatInfo {
+			id: db_chat.telegram_id,
+			calendar: db_chat.calendar,
+			next_appointment: next_appointment,
+			last_reminder,
+			pinned_message_id: db_chat.pinned_message,
+		}
+	}
+}