From f964e2c3c2338434b57b6adf25dfbc346bb89b33 Mon Sep 17 00:00:00 2001
From: Lorenz Leitner <lrnz.ltnr@gmail.com>
Date: Sun, 10 Oct 2021 14:16:03 +0200
Subject: Basic (re)implementation of gonzobot wolfram alpha

---
 src/hooks/wa.rs | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 src/hooks/wa.rs

(limited to 'src/hooks/wa.rs')

diff --git a/src/hooks/wa.rs b/src/hooks/wa.rs
new file mode 100644
index 0000000..b6d4eff
--- /dev/null
+++ b/src/hooks/wa.rs
@@ -0,0 +1,84 @@
+use anyhow::{bail, Context, Error, Result};
+use reqwest::{get, Url};
+use serde::{Deserialize, Serialize};
+use serde_json::Result as SerdeJsonResult;
+use tracing::trace;
+
+#[derive(Serialize, Deserialize, Debug)]
+struct WaResult {
+    queryresult: QueryResult,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct QueryResult {
+    pods: Vec<Pod>,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct Pod {
+    title: String,
+    id: String,
+    subpods: Vec<SubPod>,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct SubPod {
+    title: String,
+    plaintext: String,
+}
+
+fn parse_json(str_data: &str) -> SerdeJsonResult<WaResult> {
+    let w: WaResult = serde_json::from_str(str_data)?;
+    Ok(w)
+}
+
+#[tracing::instrument]
+async fn wa_query(query_str: &str) -> Result<String, Error> {
+    let app_id = "XXX"; // TODO: Get from env
+    let api_url = format!(
+        "http://api.wolframalpha.com/v2/query?input={}&appid={}&output=json",
+        query_str, app_id
+    );
+
+    let body = get(Url::parse(&api_url).context("Failed to parse url")?)
+        .await
+        .context("Failed to make request")?
+        .text()
+        .await
+        .context("failed to get request response text")?;
+
+    let full_wa_res = parse_json(&body)?;
+    trace!("got full_wa_res: {:?}", full_wa_res);
+
+    let pod_plaintexts = full_wa_res.queryresult.pods
+        .iter()
+        .filter(|it| it.id.to_lowercase() != "input")
+        .map(|pod| {
+            let subpod_texts = pod
+                .subpods
+                .iter()
+                .map(|subpod| subpod.plaintext.clone())
+                .collect::<Vec<String>>()
+                .join(", ");
+
+            format!("{}: {}", &pod.title, subpod_texts)
+        })
+        .collect::<Vec<String>>()
+        .join(" - ");
+
+    Ok(pod_plaintexts)
+}
+
+#[cfg(test)]
+mod tests {
+
+    use super::wa_query;
+    use anyhow::{Error, Result};
+
+    #[tokio::test]
+    // async fn test_query_result_json_parsing() -> Result<(), Error> {
+    async fn test_query_result_json_parsing() {
+        let res = wa_query("weather graz").await.unwrap();
+        assert_eq!(res, "asdf");
+    }
+}
-- 
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