From 0fe2c53ffdc9644df18e6501232bb687dcaf0344 Mon Sep 17 00:00:00 2001
From: Araozu <fernando@eegsac.com>
Date: Thu, 16 Nov 2023 12:06:53 -0500
Subject: [PATCH] [BE][Scans] Match records with db & convert to PDF

---
 backend/src/controller/scans/mod.rs | 100 +++++++++++++++++++++++++++-
 1 file changed, 98 insertions(+), 2 deletions(-)

diff --git a/backend/src/controller/scans/mod.rs b/backend/src/controller/scans/mod.rs
index 18f1bdb..633129b 100644
--- a/backend/src/controller/scans/mod.rs
+++ b/backend/src/controller/scans/mod.rs
@@ -265,9 +265,105 @@ async fn convert_scans_from_data(data: &Vec<(PathBuf, ScanInfo)>) -> Result<(),
         }
     };
 
-    for e in persons_info {
-        println!("\n{:?}", e);
+    // Match the results from DB with the data from the frontend,
+    // & convert the files to PDFs
+
+    for (_, info) in data {
+        let (person_info, timestamp) = match info {
+            ScanInfo::Full(dni, id, timestamp) => {
+                let person_info = persons_info.iter().find(|e| e.register_id == *id);
+                match person_info {
+                    Some(p) => (p, timestamp),
+                    None => {
+                        log::error!("Register not found in data from DB: {} {}", id, dni);
+                        continue;
+                    }
+                }
+            }
+            ScanInfo::Partial(dni, timestamp) => {
+                let person_info = persons_info
+                    .iter()
+                    .find(|e| e.person_dni == *dni && e.register_id == 0);
+                match person_info {
+                    Some(p) => (p, timestamp),
+                    None => {
+                        log::error!("Register not found in data from DB: {}", dni);
+                        continue;
+                    }
+                }
+            }
+            ScanInfo::Error(reason) => {
+                log::info!("Found an error while matching data with DB: {}", reason);
+                continue;
+            }
+        };
+
+        let filename = format!(
+            "{} {} {} - {} [{:X}].pdf",
+            person_info.person_names,
+            person_info.person_paternal_surname,
+            person_info.person_maternal_surname,
+            person_info.course_name,
+            person_info.register_id,
+        );
+
+        let image_path = PathBuf::from(format!("{}eeg_{}.jpg", SCAN_PATH, timestamp));
+        let output_path = PathBuf::from(format!("{}{}", SCAN_PATH, filename));
+
+        match convert_to_pdf(&image_path, &output_path) {
+            Ok(_) => {
+                log::info!("Converted file: {}", filename)
+            }
+            Err(reason) => {
+                log::error!("Error converting to pdf: {}", reason);
+                continue;
+            }
+        }
     }
 
     Ok(())
 }
+
+fn convert_to_pdf(image_path: &PathBuf, output_path: &PathBuf) -> Result<(), String> {
+    let img = match image::open(image_path) {
+        Ok(i) => i,
+        Err(err) => {
+            log::error!("Error opening image: {:?}", err);
+            return Err(format!("Error abriendo imagen"));
+        }
+    };
+
+    // Rotate image 45 degrees clockwise
+    let img = img.rotate270();
+
+    // Generate PDF
+    let (doc, page1, layer1) =
+        PdfDocument::new("Certificado - EEGSAC", Mm(297.0), Mm(210.0), "Layer 1");
+
+    let current_layer = doc.get_page(page1).get_layer(layer1);
+
+    let pdf_image = printpdf::image::Image::from_dynamic_image(&img);
+    let img_transform = printpdf::ImageTransform::default();
+
+    /*
+    This section of code assumes that the image is scaned at 200 DPI.
+    IF the image is scanned at a different DPI, this will give
+    wrong results.
+     */
+    let img_transform = printpdf::ImageTransform {
+        dpi: Some(200.0),
+        ..img_transform
+    };
+
+    pdf_image.add_to_layer(current_layer, img_transform);
+
+    let result = doc.save(&mut BufWriter::new(File::create(output_path).unwrap()));
+
+    match result {
+        Ok(_) => Ok(()),
+        Err(reason) => {
+            log::error!("Error saving pdf: {:?}", reason);
+            Err(format!("Error guardando pdf"))
+        }
+    }
+}