Implement per-month employee working hours

Closes #76

src/main/asciidoc/models/design/order.puml

@@ -25,7 +25,14 @@ package catering.order {
     class CustomOrder {
         - start : LocalDateTime
         - finish : LocalDateTime
+		+ getDurationInSeconds(start:LocalDateTime,finish:LocalDateTime): long
+		+ getDurationInHours(start:LocalDateTime,finish:LocalDateTime): long
+		+ min(a:LocalDateTime,b:LocalDateTime): LocalDateTime
+		+ max(b:LocalDateTime,b:LocalDateTime): LocalDateTime
+		+ getDurationInSecondsDuringMonth(month:YearMonth): long
     }
+	CustomOrder ..> time.LocalDateTime
+	CustomOrder ..> time.YearMonth
 
     enum EventType {
         EVENT_CATERING
@@ -71,6 +78,7 @@ OrderController .....> catering.orderCatalog.OrderCatalogEntry
 package time {
     class LocalDateTime
     class DateTimeFormatter
+    class YearMonth
 }
 
 @enduml

src/main/asciidoc/models/design/staff.puml

@@ -47,8 +47,8 @@ package catering.staff {
 
 	class StaffController {
 		+ StaffController(staffRepository: StaffRepository)
-    + getStaff(model: Model): String
-    + getStaff(model: Model, form: StaffForm): String
+    + getStaff(model: Model, month:Optional<YearMonth>): String
+    + getStaff(model: Model, form: StaffForm, month:Optional<YearMonth>): String
     + removeEmployee(employee: Employee, model: Model): String
     + addEmployee(form:StaffForm, result:Errors, model: Model): String
     + editEmployee(employee: Employee, model Model): String
@@ -70,6 +70,7 @@ package catering.staff {
     + findAll(): Streamable<Employee>
     + delete(id: Long): void
 	+ getAvailableStaffByJob(job: JobType, start:LocalDateTime, finish:LocalDateTime): Set<Employee>
+	+ getWorkingHourseByemployee(e: Employee,month: YearMonth): double
 	}
 		StaffManagement --> StaffRepository : -staffRepository
 		StaffManagement --> OrderManagement : -orderManagement

src/main/java/catering/order/CustomOrder.java

@@ -11,6 +11,7 @@ import org.springframework.data.annotation.Id;
 import javax.money.MonetaryAmount;
 import java.time.Duration;
 import java.time.LocalDateTime;
+import java.time.YearMonth;
 import java.time.format.DateTimeFormatter;
 import java.util.HashSet;
 import java.util.Set;
@@ -40,12 +41,37 @@ public class CustomOrder extends Order {
 
 	public CustomOrder() { }
 
+	private long getDurationInSeconds(LocalDateTime start, LocalDateTime finish) {
+		if (start.compareTo(finish) > 0) {
+			return 0;
+		}
+		return Duration.between(start, finish).getSeconds();
+	}
+
 	/**
 	 * Helper function to get the amount of hours in between start and finish (analogous to CustomCart)
 	 * @return hours between start and finish
 	 */
+	private long getDurationInHours(LocalDateTime start, LocalDateTime finish) {
+		return getDurationInSeconds(start, finish) / 3600;
+	}
+
 	public long getDurationInHours() {
-		return Duration.between(start, finish).getSeconds() / 3600;
+		return getDurationInHours(start, finish);
+	}
+
+	private static LocalDateTime min(LocalDateTime a, LocalDateTime b) {
+		return (a.compareTo(b)) < 0 ? a : b;
+	}
+
+	private static LocalDateTime max(LocalDateTime a, LocalDateTime b) {
+		return (a.compareTo(b)) > 0 ? a : b;
+	}
+
+	public long getDurationInSecondsDuringMonth(YearMonth month) {
+		LocalDateTime startInMonth = max(this.start, month.atDay(1).atStartOfDay());
+		LocalDateTime finishInMonth = min(this.finish, month.plusMonths(1).atDay(1).atStartOfDay());
+		return getDurationInSeconds(startInMonth, finishInMonth);
 	}
 
 	/**

src/main/java/catering/staff/StaffController.java

@@ -2,6 +2,9 @@ package catering.staff;
 
 import static org.salespointframework.core.Currencies.EURO;
 
+import java.time.YearMonth;
+import java.util.Optional;
+
 import org.javamoney.moneta.Money;
 import org.springframework.security.access.prepost.PreAuthorize;
 import org.springframework.stereotype.Controller;
@@ -26,13 +29,15 @@ public class StaffController {
 
 	@GetMapping("/staff")
 	@PreAuthorize("hasRole('ADMIN')")
-	public String getStaff(Model model) {
-		return getStaff(model, new StaffForm());
+	public String getStaff(Model model, @RequestParam Optional<YearMonth> month) {
+		return getStaff(model, new StaffForm(), month.orElseGet(YearMonth::now));
 	}
 
-	public String getStaff(Model model, @Valid StaffForm form) {
+	public String getStaff(Model model, @Valid StaffForm form, YearMonth month) {
 		model.addAttribute("staff", staffManagement.findAll());
 		model.addAttribute("form", form);
+		model.addAttribute("month", month);
+		model.addAttribute("management", staffManagement);
 		return "staff";
 	}
 
@@ -41,7 +46,7 @@ public class StaffController {
 	public String addEmployee(@Valid @ModelAttribute("form") StaffForm form, Errors result, Model model) {
 		form.validate(result);
 		if (result.hasErrors()) {
-			return getStaff(model, form);
+			return getStaff(model, form, YearMonth.now());
 		}
 		staffManagement.save(new Employee(form.getName(), form.getJob(), Money.of(form.getWage(), EURO)));
 		return "redirect:/staff";

src/main/java/catering/staff/StaffManagement.java

@@ -1,6 +1,7 @@
 package catering.staff;
 
 import java.time.LocalDateTime;
+import java.time.YearMonth;
 import java.util.Optional;
 import java.util.Set;
 import java.util.function.Predicate;
@@ -104,4 +105,10 @@ public class StaffManagement {
 				.collect(Collectors.toSet());
 	}
 
+	public double getWorkingHoursByEmployee(Employee e, YearMonth month) {
+		return orderManagement.findAll(Pageable.unpaged()).stream()
+				.filter(order -> order.getStaff().contains(e))
+				.map(order -> order.getDurationInSecondsDuringMonth(month))
+				.collect(Collectors.summingDouble(seconds -> (double) seconds / 3600));
+	}
 }

src/main/resources/templates/staff.html

@@ -10,11 +10,19 @@
 		<div layout:fragment="content">
 			<div>
 				<h2>Mitarbeiterdetails</h2>
+				<form th:action="@{/staff}" method="get">
+					<div class="mb-3">
+						<label for="month">Monat:</label>
+						<input type="month" name="month" id="month" th:value="${month}" required>
+					</div>
+					<button class="btn btn-primary" type="submit">Zeitangabe aktualisieren</button>
+				</form>
 				<table class="table">
 					<tr>
 						<th>Name</th>
 						<th>Beruf</th>
 						<th>Lohn</th>
+						<th>Arbeitszeit</th>
 						<th></th>
 						<th></th>
 					</tr>
@@ -23,6 +31,7 @@
 						<td th:text="${employee.name}">Max</td>
 						<td th:text="${employee.job}">Koch</td>
 						<td th:text="${employee.wage}"></td>
+						<td th:with="month=${month}" th:text="${management.getWorkingHoursByEmployee(employee, month)}"></td>
 						<td>
 							<a th:href="@{'/staff/edit/' + ${employee.id}}"
 								><button class="btn btn-warning">Bearbeiten</button></a