André Chamoun

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

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+package com.booleanuk.api.product;
+
+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/controller/Dto/ProductCreateDto.java

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+package com.booleanuk.api.product.controller.Dto;
+
+public class ProductCreateDto {
+    private String name;
+    private String category;
+    private int price;
+
+    public ProductCreateDto() {
+
+    }
+    public ProductCreateDto(String name, int id, int price, String category) {
+        setName(name);
+        setCategory(category);
+        setPrice(price);
+    }
+
+    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/controller/ProductController.java

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+package com.booleanuk.api.product.controller;
+
+import com.booleanuk.api.product.controller.Dto.ProductCreateDto;
+import com.booleanuk.api.product.model.pojo.Product;
+import com.booleanuk.api.product.model.repository.ProductRepository;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/products")
+public class ProductController {
+
+    private ProductRepository productRepository;
+
+    public ProductController() {
+        productRepository = new ProductRepository();
+
+    }
+
+    @GetMapping
+    public List<Product> getProducts(@RequestParam(required = false) String category) {
+        return productRepository.getProducts(category);
+    }
+
+    @GetMapping("/{id}")
+    public Product getProductById(@PathVariable int id) {
+        return productRepository.getOne(id);
+    }
+
+
+    @PostMapping()
+    public ResponseEntity<Product> createProduct(@RequestBody ProductCreateDto productCreateDto) {
+        Product product = new Product(productCreateDto);
+
+        productRepository.createProduct(product);
+
+        return ResponseEntity.status(HttpStatus.CREATED).body(product);
+    }
+
+    @PutMapping("/{id}")
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product update(@PathVariable int id, @RequestBody ProductCreateDto body){
+        return productRepository.updateProduct(id, body);
+    }
+
+    @DeleteMapping("/{id}")
+    @ResponseStatus(HttpStatus.OK)
+    public Product delete(@PathVariable int id) {
+        return productRepository.deleteProduct(id);
+    }
+
+
+}

src/main/java/com/booleanuk/api/product/model/pojo/Product.java

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+package com.booleanuk.api.product.model.pojo;
+
+import com.booleanuk.api.product.controller.Dto.ProductCreateDto;
+
+public class Product {
+    private static int nextId = 1;
+
+    private String name;
+    private String category;
+    private int price;
+    private int id;
+
+    public Product(String name, String category, int price) {
+        setId(nextId++);
+        setName(name);
+        setCategory(category);
+        setPrice(price);
+    }
+
+    public Product(ProductCreateDto productCreateDto) {
+        this(productCreateDto.getName(), productCreateDto.getCategory(), productCreateDto.getPrice());
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = 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/model/repository/ProductRepository.java

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+package com.booleanuk.api.product.model.repository;
+
+import com.booleanuk.api.product.controller.Dto.ProductCreateDto;
+import com.booleanuk.api.product.model.pojo.Product;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ProductRepository {
+    private List<Product> products;
+
+    public ProductRepository() {
+        this.products = new ArrayList<>();
+
+        this.products.add(new Product("Spoon", "Kitchen", 100));
+        this.products.add(new Product("Laptop", "Electronics", 10000));
+        this.products.add(new Product("Book", "Education", 150));
+
+    }
+
+    public List<Product> getProducts(String category) {
+        if (category == null || category.isBlank()) {
+            return this.products;
+        }
+        List<Product> result = new ArrayList<>();
+        for (Product p : products){
+            if (p.getCategory().equalsIgnoreCase(category)) {
+                result.add(p);
+            }
+        }
+
+        if (result.isEmpty()) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "No products of the provided category were found.");
+        }
+
+        return result;
+    }
+
+    public Product getOne(int id) {
+        for (Product p : products) {
+            if (p.getId() == id) return p;
+        }
+
+        throw new ResponseStatusException(
+                HttpStatus.NOT_FOUND,
+                "Product not found."
+        );
+    }
+
+    public void createProduct(Product product) {
+        for (Product p : this.products) {
+            if (p.getName().equalsIgnoreCase((product.getName()))) {
+                throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists");
+            }
+
+        }
+       products.add(product);
+    }
+
+    public Product updateProduct(int id, ProductCreateDto body) {
+        for (Product p : this.products) {
+            if (p.getId() == id) {
+                p.setName(body.getName());
+                p.setPrice(body.getPrice());
+                p.setCategory(body.getCategory());
+                return p;
+            }
+        }
+
+        throw new ResponseStatusException(HttpStatus.NOT_FOUND, "product not found");
+    }
+
+    public Product deleteProduct(int id) {
+        for (Product p : this.products){
+            if (p.getId() == id) {
+                this.products.remove(p);
+                return p;
+            }
+        }
+
+        throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found");
+    }
+}