feat: re-implement route rendering, use duration parsing, absolute timestamps

src/routes.rs

@@ -1,10 +1,13 @@
+use crate::duration::parse_duration;
 use crate::error::{get_error_response, TimeBannerError};
 use axum::body::Bytes;
 use axum::extract::Path;
-use axum::response::{IntoResponse, Redirect};
-use chrono::{DateTime, Utc};
+use axum::http::{header, StatusCode};
+use axum::response::IntoResponse;
+use chrono::{DateTime, FixedOffset, Utc};
 
 use crate::raster::Rasterizer;
+use crate::template::{render_template, OutputForm, RenderContext};
 
 pub fn split_on_extension(path: &str) -> Option<(&str, &str)> {
     let split = path.rsplit_once('.')?;
@@ -33,7 +36,7 @@ fn handle_rasterize(data: String, extension: &str) -> Result<(&str, Bytes), Time
                 ));
             }
 
-            Ok(("image/x-png", Bytes::from(raw_image.unwrap())))
+            Ok(("image/png", Bytes::from(raw_image.unwrap())))
         }
         _ => Err(TimeBannerError::RasterizeError(format!(
             "Unsupported extension: {}",
@@ -42,35 +45,118 @@ fn handle_rasterize(data: String, extension: &str) -> Result<(&str, Bytes), Time
     }
 }
 
+fn parse_epoch_into_datetime(epoch: i64) -> Option<DateTime<Utc>> {
+    DateTime::from_timestamp(epoch, 0)
+}
+
+fn parse_time_value(raw_time: &str) -> Result<DateTime<Utc>, TimeBannerError> {
+    // Handle relative time values (starting with + or -, or duration strings like "1y2d")
+    if raw_time.starts_with('+') || raw_time.starts_with('-') {
+        let now = Utc::now();
+
+        // Try parsing as simple offset seconds first
+        if let Ok(offset_seconds) = raw_time.parse::<i64>() {
+            return Ok(now + chrono::Duration::seconds(offset_seconds));
+        }
+
+        // Try parsing as duration string (e.g., "+1y2d", "-3h30m")
+        if let Ok(duration) = parse_duration(raw_time) {
+            return Ok(now + duration);
+        }
+
+        return Err(TimeBannerError::ParseError(format!(
+            "Could not parse relative time: {}",
+            raw_time
+        )));
+    }
+
+    // Try to parse as epoch timestamp
+    if let Ok(epoch) = raw_time.parse::<i64>() {
+        return parse_epoch_into_datetime(epoch)
+            .ok_or_else(|| TimeBannerError::ParseError("Invalid timestamp".to_string()));
+    }
+
+    Err(TimeBannerError::ParseError(format!(
+        "Could not parse time value: {}",
+        raw_time
+    )))
+}
+
+fn render_time_response(
+    time: DateTime<Utc>,
+    output_form: OutputForm,
+    extension: &str,
+) -> impl IntoResponse {
+    // Build context for rendering
+    let context = RenderContext {
+        output_form,
+        value: time,
+        tz_offset: FixedOffset::east_opt(0).unwrap(), // UTC offset
+        tz_name: "UTC",
+        view: "basic",
+    };
+
+    // Render template
+    let rendered_template = match render_template(context) {
+        Ok(template) => template,
+        Err(e) => {
+            return get_error_response(TimeBannerError::RenderError(format!(
+                "Template rendering failed: {}",
+                e
+            )))
+            .into_response()
+        }
+    };
+
+    // Handle rasterization
+    match handle_rasterize(rendered_template, extension) {
+        Ok((mime_type, bytes)) => {
+            (StatusCode::OK, [(header::CONTENT_TYPE, mime_type)], bytes).into_response()
+        }
+        Err(e) => get_error_response(e).into_response(),
+    }
+}
+
 pub async fn index_handler() -> impl IntoResponse {
     let epoch_now = Utc::now().timestamp();
 
-    Redirect::temporary(&format!("/relative/{epoch_now}")).into_response()
+    axum::response::Redirect::temporary(&format!("/relative/{epoch_now}")).into_response()
 }
 
 pub async fn relative_handler(Path(path): Path<String>) -> impl IntoResponse {
-    let (_raw_time, _extension) = parse_path(path.as_str());
+    let (raw_time, extension) = parse_path(&path);
 
-    get_error_response(TimeBannerError::NotFound).into_response()
+    let time = match parse_time_value(raw_time) {
+        Ok(t) => t,
+        Err(e) => return get_error_response(e).into_response(),
+    };
+
+    render_time_response(time, OutputForm::Relative, extension).into_response()
+}
+
+pub async fn absolute_handler(Path(path): Path<String>) -> impl IntoResponse {
+    let (raw_time, extension) = parse_path(&path);
+
+    let time = match parse_time_value(raw_time) {
+        Ok(t) => t,
+        Err(e) => return get_error_response(e).into_response(),
+    };
+
+    render_time_response(time, OutputForm::Absolute, extension).into_response()
+}
+
+// Handler for implicit absolute time (no /absolute/ prefix)
+pub async fn implicit_handler(Path(path): Path<String>) -> impl IntoResponse {
+    let (raw_time, extension) = parse_path(&path);
+
+    let time = match parse_time_value(raw_time) {
+        Ok(t) => t,
+        Err(e) => return get_error_response(e).into_response(),
+    };
+
+    render_time_response(time, OutputForm::Absolute, extension).into_response()
 }
 
 pub async fn fallback_handler() -> impl IntoResponse {
     get_error_response(TimeBannerError::NotFound).into_response()
 }
-
-pub async fn absolute_handler(Path(path): Path<String>) -> impl IntoResponse {
-    let (_raw_time, _extension) = parse_path(path.as_str());
-
-    get_error_response(TimeBannerError::NotFound).into_response()
-}
-
-// basic handler that responds with a static string
-pub async fn implicit_handler(Path(path): Path<String>) -> impl IntoResponse {
-    let (_raw_time, _extension) = parse_path(path.as_str());
-
-    get_error_response(TimeBannerError::NotFound).into_response()
-}
-
-fn parse_epoch_into_datetime(epoch: i64) -> Option<DateTime<Utc>> {
-    DateTime::from_timestamp(epoch, 0)
-}