1 files changed, 94 insertions, 0 deletions
diff --git a/src/handlers.rs b/src/handlers.rs
new file mode 100644
index 0000000..3f815a5
--- /dev/null
+++ b/src/handlers.rs
@@ -0,0 +1,94 @@
+use axum::{
+    extract::{Query, State},
+    http::StatusCode,
+    response::Json,
+};
+use chrono::NaiveTime;
+use sqlx::PgPool;
+use uuid::Uuid;
+
+use crate::error::AppError;
+use crate::models::{DateQuery, MeasurementData, MeasurementView, Unit};
+
+pub async fn index() -> &'static str {
+    "Hello World!"
+}
+
+pub async fn all(State(pool): State<PgPool>) -> Result<Json<Vec<MeasurementView>>, AppError> {
+    let rows = sqlx::query_as!(
+        MeasurementView,
+        "SELECT id, measured_at, metric_type, value, unit FROM measurement"
+    )
+    .fetch_all(&pool)
+    .await?;
+    Ok(Json(rows))
+}
+
+pub async fn add(
+    State(pool): State<PgPool>,
+    Json(data): Json<MeasurementData>,
+) -> Result<(StatusCode, Json<Uuid>), AppError> {
+    let rec = sqlx::query!(
+        "
+        INSERT INTO measurement (id, measured_at, metric_type, value, unit)
+        VALUES ($1, $2, $3, $4, $5)
+        RETURNING id
+        ",
+        Uuid::now_v7(),
+        data.measured_at,
+        data.metric_type,
+        data.value,
+        data.unit
+    )
+    .fetch_one(&pool)
+    .await?;
+    Ok((StatusCode::CREATED, Json(rec.id)))
+}
+
+pub async fn search(
+    State(pool): State<PgPool>,
+    Query(date_query): Query<DateQuery>,
+) -> Result<Json<Vec<MeasurementView>>, AppError> {
+    let (from, to) = match (date_query.date, date_query.from, date_query.to) {
+        (Some(date), None, None) => (Some(date), Some(date)),
+        (None, from, to) => (from, to),
+        _ => return Err(AppError::BadRequest),
+    };
+    if from.is_none() && to.is_none() {
+        return Err(AppError::BadRequest);
+    }
+    if let (Some(from), Some(to)) = (from, to)
+        && from > to
+    {
+        return Err(AppError::BadRequest);
+    }
+    let start = from.map(|from| from.and_time(NaiveTime::MIN).and_utc());
+    let end = match to {
+        Some(to) => {
+            let Some(next_day) = to.succ_opt() else {
+                return Err(AppError::BadRequest);
+            };
+            Some(next_day.and_time(NaiveTime::MIN).and_utc())
+        }
+        None => None,
+    };
+    let rows = sqlx::query_as!(
+        MeasurementView,
+        "SELECT id, measured_at, metric_type, value, unit FROM measurement
+         WHERE ($1::timestamptz IS NULL OR measured_at >= $1)
+           AND ($2::timestamptz IS NULL OR measured_at < $2)",
+        start,
+        end
+    )
+    .fetch_all(&pool)
+    .await?;
+    Ok(Json(rows))
+}
+
+pub async fn units(State(pool): State<PgPool>) -> Result<Json<Vec<Unit>>, AppError> {
+    Ok(Json(
+        sqlx::query_scalar("SELECT enum_range(NULL::unit)")
+            .fetch_one(&pool)
+            .await?,
+    ))
+}