1 files changed, 73 insertions, 28 deletions

diff --git a/dichroism/src/image_api.rs b/dichroism/src/image_api.rs
index 3eff88e..07b9552 100644
--- a/dichroism/src/image_api.rs
+++ b/dichroism/src/image_api.rs
@@ -1,36 +1,84 @@
 use crate::error::DichroismError;
 use crate::result::Result;
 use base64::decode;
+use image::imageops::FilterType;
+use image::DynamicImage;
+use image::GenericImageView;
 use regex::Regex;
+use std::path::PathBuf;
+use uuid::Uuid;
 
 use once_cell::sync::Lazy;
 
 static DATA_URI_RE: Lazy<Regex> = Lazy::new(|| {
-    Regex::new("^data:image/(png|jpeg);base64,(?P<data>.+)").expect("Couldn't parse Regex.")
+    Regex::new("^data:image/(png|jpeg);base64,(?P<data>.+)")
+        .expect("Couldn't parse data URI Regex.")
 });
 
-pub fn generate_images(data: &str) -> Result<()> {
-    let bytes = decode(data)?;
-    let img = image::load_from_memory(&bytes)?;
-    //img.save("test_full.jpg")?;
-    let _thumb = img.thumbnail(200, 200);
-    //thumb.save("test_thumbnail.jpg")?;
-    Ok(())
-
-    // TODO: gather and return related images as a tuple. then in another function, write them
-    // out to the filesystem and return NewImages using the resulting paths. The pathnames
-    // *probably* need to be UUIDs.
+pub struct NewProductImageData {
+    original: DynamicImage,  // original, just for safe-keeping
+    fullsize: DynamicImage,  // full-size, "zoomed" view
+    base: DynamicImage,      // basic viewing
+    thumbnail: DynamicImage, // tiny, square thumbnail
 }
 
-pub fn extract_data(uri: &str) -> Result<&str> {
-    let caps = DATA_URI_RE
-        .captures(uri)
-        .ok_or(DichroismError::UriDataExtract)?;
+impl NewProductImageData {
+    pub fn from_data_uri(uri: &str) -> Result<Self> {
+        let data = DATA_URI_RE
+            .captures(uri)
+            .ok_or(DichroismError::UriDataExtract)?
+            .name("data")
+            .ok_or(DichroismError::UriDataExtract)?
+            .as_str();
+        let original = image::load_from_memory(&decode(data)?)?;
+        let fullsize = original.resize(1000, 1000, FilterType::Lanczos3);
+        let base = original.resize(640, 640, FilterType::Lanczos3);
 
-    Ok(caps
-        .name("data")
-        .expect("Should never fail if regex succeeded.")
-        .as_str())
+        let (width, height) = original.dimensions();
+        let thumbnail = if width > height {
+            let offset = (width - height) / 2;
+            original.crop_imm(offset, 0, width - offset * 2, height)
+        } else {
+            let offset = (height - width) / 2;
+            original.crop_imm(0, offset, width, height - offset * 2)
+        }
+        .resize(300, 300, FilterType::Lanczos3);
+
+        Ok(NewProductImageData {
+            original,
+            fullsize,
+            base,
+            thumbnail,
+        })
+    }
+
+    pub fn commit(self, prefix: &str) -> Result<NewProductImages> {
+        Ok(NewProductImages {
+            original: self.commit_single(prefix, &self.original)?,
+            fullsize: self.commit_single(prefix, &self.fullsize)?,
+            base: self.commit_single(prefix, &self.base)?,
+            thumbnail: self.commit_single(prefix, &self.thumbnail)?,
+        })
+    }
+
+    fn commit_single(&self, prefix: &str, image: &DynamicImage) -> Result<String> {
+        let base_name = Uuid::new_v3(&Uuid::NAMESPACE_OID, &image.to_bytes())
+            .to_hyphenated()
+            .to_string();
+        let mut path = PathBuf::new();
+        path.push(prefix);
+        path.push(base_name);
+        path.set_extension("jpg");
+        image.save(&path)?;
+        Ok(path.to_str().ok_or(DichroismError::ImageWrite)?.to_string())
+    }
+}
+
+pub struct NewProductImages {
+    original: String,
+    fullsize: String,
+    base: String,
+    thumbnail: String,
 }
 
 #[cfg(test)]
@@ -41,13 +89,10 @@ mod tests {
     const TEST_DATA_BASE64: &str = include_str!("unit_test_data/test_data_base64.txt");
 
     #[test]
-    fn test_generate_images() {
-        generate_images(TEST_DATA_BASE64.trim()).unwrap();
-    }
-
-    #[test]
-    fn test_extract_data() {
-        let base64_data = extract_data(TEST_DATA_URI).unwrap();
-        assert_eq!(TEST_DATA_BASE64.trim(), base64_data);
+    fn test_gen_product_images() {
+        NewProductImageData::from_data_uri(TEST_DATA_URI.trim())
+            .unwrap()
+            .commit(".")
+            .unwrap();
     }
 }