1 files changed, 98 insertions, 0 deletions
diff --git a/src/discord.rs b/src/discord.rs
new file mode 100644
index 0000000..c7aea78
--- /dev/null
+++ b/src/discord.rs
@@ -0,0 +1,98 @@
+use std::sync::Arc;
+
+use anyhow::Result;
+use chrono::prelude::*;
+use evtclib::Log;
+use serenity::client::bridge::gateway::ShardManager;
+use serenity::model::id::*;
+use serenity::prelude::*;
+
+use log::info;
+
+use super::categories::Categorizable;
+
+const MAX_HOURS: i64 = 5;
+
+struct ShardManagerContainer;
+
+impl TypeMapKey for ShardManagerContainer {
+    type Value = Arc<Mutex<ShardManager>>;
+}
+
+#[derive(Debug, Clone)]
+struct Handler {
+    channel_id: u64,
+    log: Log,
+    link: String,
+}
+
+impl EventHandler for Handler {
+    fn ready(&self, ctx: Context, _ready: serenity::model::gateway::Ready) {
+        info!("Discord client is ready");
+        let mut messages = ChannelId(self.channel_id)
+            .messages(&ctx, |r| r.limit(25))
+            .unwrap();
+        messages.sort_by_key(|m| m.timestamp);
+        messages.retain(|m| {
+            m.is_own(&ctx)
+                && Utc::now().signed_duration_since(m.timestamp)
+                    < chrono::Duration::hours(MAX_HOURS)
+        });
+
+        if let Some(mut m) = messages.pop() {
+            let new_text = insert_link(&m.content, &self.log, &self.link);
+            m.edit(&ctx, |m| m.content(new_text)).unwrap();
+        } else {
+            let new_text = insert_link("", &self.log, &self.link);
+            ChannelId(self.channel_id).say(&ctx, new_text).unwrap();
+        }
+
+        let data = ctx.data.read();
+        if let Some(manager) = data.get::<ShardManagerContainer>() {
+            manager.lock().shutdown_all();
+        }
+    }
+}
+
+pub fn post_link(discord_token: &str, channel_id: u64, log: Log, link: String) -> Result<()> {
+    let mut client = Client::new(
+        discord_token,
+        Handler {
+            channel_id,
+            log,
+            link,
+        },
+    )?;
+    {
+        let mut data = client.data.write();
+        data.insert::<ShardManagerContainer>(Arc::clone(&client.shard_manager));
+    }
+    client.start()?;
+    Ok(())
+}
+
+fn find_insertion(text: &str, category: &str) -> Option<usize> {
+    let cat_pos = text.find(&format!("**{}**", category))?;
+    let empty_line = text[cat_pos..].find("\n\n")?;
+    Some(cat_pos + empty_line + 1)
+}
+
+fn insert_link(text: &str, log: &Log, link: &str) -> String {
+    let mut text = format!("\n\n{}\n\n", text);
+    let point = find_insertion(&text, log.category());
+    let link_line = format!("{} {}\n", state_emoji(log), link);
+    if let Some(i) = point {
+        text.insert_str(i, &link_line);
+    } else {
+        text.push_str(&format!("**{}**\n{}", log.category(), link_line));
+    }
+    text.trim().into()
+}
+
+fn state_emoji(log: &Log) -> &'static str {
+    if log.was_rewarded() {
+        "✔️"
+    } else {
+        "❌"
+    }
+}