Update SalesDAO to include saveAll method for bulk sales insertion

src/main/java/net/codejava/AppController.java

@@ -37,8 +37,18 @@
 import org.springframework.dao.DuplicateKeyException;
 import java.util.Date;
 import javax.servlet.http.HttpSession;
-// import java.util.logging.Logger;
-// import java.util.logging.Level;
+// improt MultipartFile class
+import org.springframework.web.multipart.MultipartFile;
+// import portMaooing class
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+// bufferedReader
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.time.format.DateTimeFormatter;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
 
 @EnableJpaRepositories(basePackages = "net.codejava")
 @Controller
@@ -207,5 +217,56 @@ public void exportToCSV(HttpServletResponse response) throws IOException {
 			writer.newLine();
 		}
 		writer.flush();
-}
+	}
+
+	@PostMapping("/import")
+	public String uploadFile(@RequestParam("file") MultipartFile file, RedirectAttributes redirectAttributes) {
+		try {
+			// Parse the file
+			BufferedReader reader = new BufferedReader(new InputStreamReader(file.getInputStream()));
+
+			// Validate the header
+			String line = reader.readLine();  // Read the first line
+			if (line == null || !line.equals("Serial Number,Item Name,Amount,Quantity,Date")) {
+				throw new IllegalArgumentException("Invalid header. Expected 'Serial Number,Item Name,Amount,Quantity,Date'");
+			}
+
+			// Validate the rest of the file
+			while ((line = reader.readLine()) != null) {
+				String[] fields = line.split(",");
+				if (fields.length != 5) {
+					throw new IllegalArgumentException("Invalid line. Each line should contain exactly 5 fields separated by commas.");
+				}
+			}
+
+			// If the file format is valid, convert it to a list of Sale objects
+			List<Sale> sales = new ArrayList<>();
+			reader = new BufferedReader(new InputStreamReader(file.getInputStream())); // Reset the reader
+			reader.readLine(); // Skip the header
+			while ((line = reader.readLine()) != null) {
+				String[] fields = line.split(",");
+				Sale sale = new Sale();
+				sale.setSerialNumber(fields[0].trim());
+				sale.setItem(fields[1].trim());
+
+				// Convert LocalDate to Date
+				DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
+				LocalDate date = LocalDate.parse(fields[4].trim(), formatter);
+				Date sqlDate = Date.from(date.atStartOfDay(ZoneId.systemDefault()).toInstant());
+				sale.setDate(sqlDate);
+
+				sale.setAmount((float) Double.parseDouble(fields[2].trim()));
+				sale.setQuantity(Integer.parseInt(fields[3].trim()));
+				sales.add(sale);
+			}
+
+			// If the file format is valid, call the upload method
+			dao.saveAll(sales);
+			redirectAttributes.addFlashAttribute("message", "Successfully saved the list of Sale objects to the database");
+			System.out.println("Successfully saved the list of Sale objects to the database");
+		} catch (Exception e) {
+			System.out.println("Error calling dao.saveAll(sales): " + e.getMessage());
+		}
+		return "redirect:/";
+	}
 }

src/main/java/net/codejava/SalesDAO.java

@@ -124,4 +124,23 @@ public List<Sale> listAll() {
 		List<Sale> listSale = jdbcTemplate.query(sql, BeanPropertyRowMapper.newInstance(Sale.class));
 		return listSale;
 	}
+
+	// save all sales in a list
+	public void saveAll(List<Sale> sales) {
+		if (sales == null) {
+			throw new IllegalArgumentException("List of sales cannot be null");
+		}
+
+		if (jdbcTemplate == null) {
+			throw new IllegalStateException("JdbcTemplate cannot be null");
+		}
+
+		SimpleJdbcInsert insertActor = new SimpleJdbcInsert(jdbcTemplate);
+		insertActor.withTableName("sales").usingColumns("serial_number", "item", "quantity", "amount", "date");
+
+		for (Sale sale : sales) {
+			BeanPropertySqlParameterSource param = new BeanPropertySqlParameterSource(sale);
+			insertActor.execute(param);
+		}
+	}
 }

src/main/java/net/codejava/SecurityConfig.java

@@ -10,6 +10,7 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.http.HttpMethod;
 
 
 @EnableWebSecurity
@@ -24,8 +25,10 @@ public class SecurityConfig extends WebSecurityConfigurerAdapter {
     @Override
     protected void configure(HttpSecurity http) throws Exception {
         http
+            .csrf().disable()
             .authorizeRequests()
                 .antMatchers("/login").permitAll()
+                .antMatchers(HttpMethod.POST, "/import").permitAll()
                 // .anyRequest().permitAll()
                 .anyRequest().authenticated()
                 .and()

src/main/resources/templates/index.html

@@ -51,6 +51,51 @@
         <h1>Inventory Records</h1>
         <a href="/new" class="modern-button">Enter New Product</a>
         <a href="/export" class="modern-button">Export to CSV</a>
+        <form id="uploadForm" style="display: none;">
+            <input type="file" id="csvFile" name="file" accept=".csv">
+            <button type="submit" id="submitBtn">Submit</button>
+        </form>
+        <label for="csvFile" class="modern-button">Import from CSV</label>
+        <div id="errorMessage" style="color: red;"></div>
+        <script>
+            document.getElementById('csvFile').addEventListener('change', function() {
+                if (this.value) {
+                    document.getElementById('uploadForm').style.display = 'block';
+                } else {
+                    document.getElementById('uploadForm').style.display = 'none';
+                }
+            });
+
+            document.getElementById('uploadForm').addEventListener('submit', function(e) {
+                e.preventDefault();
+
+                var formData = new FormData();
+                formData.append('file', document.getElementById('csvFile').files[0]);
+
+                fetch('/import', {
+                    method: 'POST',
+                    body: formData
+                }).then(response => {
+                    if (!response.ok) {
+                        throw new Error('Network response was not ok');
+                    }
+                    return response.text();
+                }).then(data => {
+                    console.log('File uploaded successfully: ' + data);
+                    // clear the file input and hide the form
+                    document.getElementById('csvFile').value = '';
+                    document.getElementById('uploadForm').style.display = 'none';
+
+                    // Wait for 1 second before reloading the page
+                    setTimeout(function() {
+                        location.reload();
+                    }, 1000);
+                }).catch(error => {
+                    console.error('There has been a problem with your fetch operation: ', error);
+                    document.getElementById('errorMessage').textContent = 'Error: ' + error.message;
+                });
+            });
+        </script>
         <br><br>
         <div id="searchFeature">
             <form action="/search" method="get">
@@ -67,7 +112,7 @@ <h1>Inventory Records</h1>
         </div>
         <br />
         <form th:action="@{/logout}" method="post">
-            <input type="hidden" th:name="${_csrf.parameterName}" th:value="${_csrf.token}" />
+            <!-- <input type="hidden" th:name="${_csrf.parameterName}" th:value="${_csrf.token}" /> -->
             <input type="submit" value="Logout" />
         </form>
         <br />