Solution from Pabel Lopez

documents/Zoom-care.postman_collection.json

@@ -0,0 +1,38 @@
+{
+	"info": {
+		"_postman_id": "815913fd-1f1e-481c-aff4-02121dde4d02",
+		"name": "Zoom-care",
+		"schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json",
+		"_exporter_id": "24706689"
+	},
+	"item": [
+		{
+			"name": "Get Top Employees",
+			"request": {
+				"method": "GET",
+				"header": []
+			},
+			"response": []
+		},
+		{
+			"name": "Get Employee by Id",
+			"request": {
+				"method": "GET",
+				"header": [],
+				"url": {
+					"raw": "http://localhost:8080/employee/1",
+					"protocol": "http",
+					"host": [
+						"localhost"
+					],
+					"port": "8080",
+					"path": [
+						"employee",
+						"1"
+					]
+				}
+			},
+			"response": []
+		}
+	]
+}

documents/development-notes.txt

@@ -0,0 +1,12 @@
+Development notes:
+
+This challenge was solved by creating two GET API calls: 
+
+This will be returning all top employee
+   {host}/employee
+This will be returning a specific employee by providing the id into the url
+   {host}/employee/{id}
+Please see on /documents folder, I did include a PostMan Collection with API calls examples
+File: Zoom-care.postman_collection.json
+
+Notes: I did face some issues with browser cache data, in order to perform further test I did add some extra test data on /src/main/db/migration/ V2__initial_data_structures.sql

src/main/java/com/zoomcare/candidatechallenge/controller/EmployeeController.java

@@ -0,0 +1,30 @@
+package com.zoomcare.candidatechallenge.controller;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.zoomcare.candidatechallenge.employee.EmployeeJdbc;
+/**
+ * @author Pabel Lopez
+ */
+
+@RestController
+public class EmployeeController {
+
+    @Autowired
+    EmployeeJdbc repository;
+
+    @GetMapping("employee/{id}")
+    public List getEmployeeById (@PathVariable final long id){        
+        return repository.getEmployeeById(id);
+    }
+
+    @GetMapping("employee/")
+    public List getTopLevelEmployees (){
+        return repository.getTopLevelEmployees();
+    }
+}

src/main/java/com/zoomcare/candidatechallenge/employee/EmployeeBean.java

@@ -0,0 +1,49 @@
+package com.zoomcare.candidatechallenge.employee;
+
+import java.util.List;
+import java.util.Map;
+/**
+ * @author Pabel Lopez
+ */
+
+public class EmployeeBean {
+    private long id;    
+    private List<Map<String,String>> properties;
+    private List<List<Map<String,String>>> reportList ;
+    public EmployeeBean (){
+    } 
+
+    public EmployeeBean(long id, List<Map<String, String>> properties) {
+        this.id = id;
+        this.properties = properties;
+    }
+
+    public long getId() {
+        return id;
+    }   
+
+    public List<Map<String, String>> getProperties() {
+        return properties;
+    }
+
+    public List<List<Map<String, String>>> getReportList() {
+        return reportList;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public void setProperties(List<Map<String, String>> properties) {
+        this.properties = properties;
+    }
+
+    public void setReportList(List<List<Map<String, String>>> reportList) {
+        this.reportList = reportList;
+    }
+
+    @Override
+    public String toString() {
+        return "EmployeeBean [id=" + id + ", properties=" + properties + ", reportList=" + reportList + "]";
+    }    
+}

src/main/java/com/zoomcare/candidatechallenge/employee/EmployeeJdbc.java

@@ -0,0 +1,117 @@
+package com.zoomcare.candidatechallenge.employee;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Repository;
+/**
+ * @author Pabel Lopez
+ */
+
+@Repository
+public class EmployeeJdbc {
+    @Autowired
+    JdbcTemplate jdbcTemplate;
+
+    private String SELECT_EMPLOYEE_BY_ID ="select * from employee where id=?";
+    private String SELECT_CATEGORIES = "select * from property where employee_id=?";
+    private String SELECT_REPORT_STRUCTURE = "select id from employee where supervisor_id=?";
+    private String SELECT_TOP_EMPLOYEES = "select id from employee where supervisor_id is null";
+
+     /** 
+      * <p> Return all top level employees</p>
+      @return A list wit all top level Employees
+     */
+    public List <EmployeeBean> getTopLevelEmployees (){
+        List<EmployeeBean> topEmpList = new ArrayList<>();
+        List<Map<String,Object>> list = jdbcTemplate.queryForList(SELECT_TOP_EMPLOYEES);       
+        for (int i=0; i<list.size();i++){
+            Map<String,Object> topEmployee= list.get(i);             
+            EmployeeBean employee = getEmployeeById((Long)topEmployee.get("id")).get(0);
+            topEmpList.add(employee);
+        }
+        return topEmpList;
+    }
+
+     /** 
+      * <p> Return a specific Employee based on provided id</p>
+      @param id The id of the employee to be retrieved
+      @return A list of employee properties and nested reporting structure
+     */
+    public List <EmployeeBean> getEmployeeById(long id){       
+        List<Map<String,Object>> list = jdbcTemplate.queryForList(SELECT_EMPLOYEE_BY_ID, id);
+        List<EmployeeBean> empList = new ArrayList<>();
+
+        list.forEach(item -> {
+            List<Map<String,String>> propertyList = new ArrayList<>(); 
+            List<List<Map<String,String>>> reportLi;            
+            EmployeeBean employee = new EmployeeBean();
+
+            employee.setId((Long)item.get("id"));                   
+            propertyList = getProperties(id);
+            reportLi = getNestedReport(id);
+            if (reportLi.size()>0){
+                employee.setReportList(reportLi);
+            }
+            if (propertyList.size()>0){
+                employee.setProperties(propertyList); 
+            }                      
+            empList.add(employee);
+        });
+        return empList;
+    }
+
+     /** 
+      * <p> Return all the properties of one employee based on provided id</p>
+      @param id The id of the employee to be retrieved
+      @return A list containing the map<key,value> of all properties of employee 
+     */
+    private List<Map<String,String>> getProperties (long id){
+        List<Map<String,String>> properties = new ArrayList<>();
+        List<Map<String,Object>> propertiesList = jdbcTemplate.queryForList(SELECT_CATEGORIES, id);
+
+        propertiesList.forEach(property ->{                    
+            Map <String,String> map = new HashMap<String,String>();
+            map.put("key", (String) property.get("key"));
+            map.put("value", (String) property.get("value"));
+            properties.add(map);
+        });
+
+        return properties;
+    }
+
+    /** 
+      * <p> Return a list with all nested employee related to the provided supervidor</p>
+      @param id The id of the supervisor to get the nested organization
+      @return A list containing the map<key,value> of all reported employees of the supervisor provided
+     */
+    private List<List<Map<String,String>>> getNestedReport (long id){
+        List<List<Map<String,String>>> reportList = new ArrayList<List<Map<String,String>>>();
+        List<Map<String,Object>> list = jdbcTemplate.queryForList(SELECT_REPORT_STRUCTURE, id);
+        if (list.size()>0){            
+            list.forEach(item ->{
+               List<List<Map<String,String>>> innerReportList;
+               List<Map<String,String>> subReport = new ArrayList<Map<String,String>>();
+               Map <String,String> map = new HashMap<String,String>();
+               map.put("supervisor_id", String.valueOf(id));
+               map.put("employee_id", String.valueOf(item.get("id")));
+               subReport.add(map);
+               reportList.add(subReport);
+               innerReportList = getNestedReport ((Long)item.get("id"));
+               if (innerReportList.size()>0){
+                    innerReportList.forEach(sub ->{
+                        for (int i=0; i<sub.size();i++){
+                            subReport.add(sub.get(i));
+                        }
+                    });
+               }
+
+            });
+        }
+        return reportList;
+    }
+}

src/main/resources/application.properties

@@ -0,0 +1,4 @@
+# Enabling H2 Console
+spring.h2.console.enabled=true
+#set JDBC path to DB
+spring.datasource.url=jdbc:h2:mem:testdb

src/main/resources/db/migration/V2__initial_data_structures.sql

@@ -2,6 +2,10 @@ insert into employee values ();
 select @ceo := scope_identity();
 insert into property (employee_id, key, value) values (@ceo, 'title', 'CEO');
 
+insert into employee values ();
+select @cio := scope_identity();
+insert into property (employee_id, key, value) values (@cio, 'title', 'CIO');
+
 insert into employee (supervisor_id) values (@ceo);
 select @vpsales := scope_identity();
 insert into property (employee_id, key, value) values (@vpsales, 'title', 'Vice President of Sales');
@@ -36,4 +40,13 @@ insert into property (employee_id, key, value) values (@namarketing, 'region', '
 insert into employee(supervisor_id) values (@vpm);
 select @eumarketing := scope_identity();
 insert into property (employee_id, key, value) values (@eumarketing, 'title', 'Regional Director of Marketing');
-insert into property (employee_id, key, value) values (@eumarketing, 'region', 'Europe');
+insert into property (employee_id, key, value) values (@eumarketing, 'region', 'Europe');
+
+insert into employee(supervisor_id) values (@cio);
+select @latamketing := scope_identity();
+insert into property (employee_id, key, value) values (@latamketing, 'title', 'Regional Director of Marketing');
+insert into property (employee_id, key, value) values (@latamketing, 'region', 'Latin America');
+
+insert into employee values ();
+select @inversor := scope_identity();
+insert into property (employee_id, key, value) values (@inversor, 'title', 'Investment Director');