Wilmer Winkler

src/main/java/com/booleanuk/api/Main.java

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+package com.booleanuk.api;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Main {
+    public static void main(String[] args) {
+        SpringApplication.run(Main.class, args);
+    }
+}

src/main/java/com/booleanuk/api/Product/Product.java

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+package com.booleanuk.api.Product;
+
+public class Product {
+    private static int nextID = 1;
+
+    private int id;
+    private String name;
+    private String category;
+    private int price;
+
+    public Product(String name, String category, int price) {
+        this.id = nextID;
+        nextID++;
+        this.name = name;
+        this.category = category;
+        this.price = price;
+    }
+
+
+    public int getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getCategory() {
+        return category;
+    }
+
+    public void setCategory(String category) {
+        this.category = category;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+}

src/main/java/com/booleanuk/api/Product/ProductController.java

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+package com.booleanuk.api.Product;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RestController
+@RequestMapping("products")
+public class ProductController {
+    private ProductRepository theProducts;
+
+    public ProductController() {
+        this.theProducts = new ProductRepository();
+    }
+
+    @GetMapping
+    public List<Product> getAllProducts(@RequestParam(name = "category", required = false)String category ) {
+        List<Product> products;
+        if(category != null){
+            products = this.theProducts.getAll(category);
+        }
+        else{
+            products = this.theProducts.getAll();
+        }
+
+
+        if (products.isEmpty()) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Not found");
+        }
+        return products;
+    }
+
+
+    @GetMapping("/{id}")
+    public Product getOneProduct(@PathVariable(name = "id") int id) {
+
+        if (this.theProducts.getOne(id) == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Not found");
+        }
+        return this.theProducts.getOne(id);
+    }
+
+    @PutMapping("/{id}")
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product updateProduct(@PathVariable(name = "id") int id, @RequestBody Product newProduct){
+
+        if(this.theProducts.chechNameAvailable(newProduct.getName(), id)){
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Name already exists");
+        }
+        if (this.theProducts.updateProduct(id, newProduct) == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Not found");
+        }
+        return newProduct;
+    }
+
+    @DeleteMapping("/{id}")
+    public Product removeProduct(@PathVariable(name = "id") int id){
+
+        Product product = this.theProducts.removeProduct(id);
+        if (product == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Not found");
+        }
+        return product;
+    }
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product createProduct(@RequestBody Product product){
+
+        if(this.theProducts.chechNameAvailable(product.getName())){
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Name already exists");
+        }
+        if (this.theProducts.createProduct(product) == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Not found");
+        }
+        return product;
+    }
+}

src/main/java/com/booleanuk/api/Product/ProductRepository.java

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+package com.booleanuk.api.Product;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+
+public class ProductRepository {
+
+    private ArrayList<Product> products;
+
+    public ProductRepository(){
+        this.products = new ArrayList<>();
+
+        this.products.add(new Product("Volvo c30 R-design", "Car", 100000));
+        this.products.add(new Product("Nintendo", "Game console", 4000));
+    }
+
+    public ArrayList<Product> getAll(){
+        return this.products;
+    }
+
+    public Product getOne(int id){
+        for(Product product : products){
+            if(product.getId() == id){
+                return product;
+            }
+        }
+        return null;
+    }
+
+    public Product updateProduct(int id, Product updatedProduct){
+        for(Product product : products){
+            if(product.getId() == id){
+                product.setName(updatedProduct.getName());
+                product.setCategory(updatedProduct.getCategory());
+                product.setPrice(updatedProduct.getPrice());
+                return product;
+            }
+        }
+        return null;
+    }
+
+    public Product removeProduct(int id){
+        for(Product product : products){
+            if(product.getId() == id){
+                products.remove(product);
+                return product;
+            }
+        }
+        return null;
+    }
+
+    public Product createProduct(Product product){
+        products.add(product);
+        return product;
+    }
+
+    public Boolean chechNameAvailable(String name){
+        for (Product product : products){
+            if(product.getName().equals(name)){
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public Boolean chechNameAvailable(String name, int id){
+        for (Product product : products){
+            if(product.getName().equals(name) && product.getId() != id){
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public List<Product> getAll(String category) {
+        List<Product> temp = new ArrayList<>();
+        temp = this.products.stream()
+                .filter(product -> product.getCategory().equals(category))
+                .toList();
+        return temp;
+    }
+}