[FEATURE] Hiking Duration Calculator

2026-05-25 19:07:08 +02:00
commit 85ae5952a9
16 changed files with 781 additions and 0 deletions
@@ -0,0 +1,13 @@
+package de.pitfriedrich.hikebuddy;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class HikebuddyApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(HikebuddyApplication.class, args);
+    }
+
+}
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+package de.pitfriedrich.hikebuddy.calculator;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PostMapping;
+
+@Controller
+public class HikeDurationController {
+
+    private final HikeDurationService hikeDurationService;
+
+    public HikeDurationController(HikeDurationService hikeDurationService) {
+        this.hikeDurationService = hikeDurationService;
+    }
+
+    @GetMapping("/")
+    public String index() {
+        return "redirect:/calculator";
+    }
+
+    @GetMapping("/calculator")
+    public String calculatorForm(Model model) {
+        model.addAttribute("form", new HikeDurationForm());
+        return "calculator";
+    }
+
+    @PostMapping("/calculator")
+    public String calculate(@ModelAttribute HikeDurationForm form, Model model) {
+        model.addAttribute("form", form);
+        if (form.getAltitudeDifference() != null && form.getDistance() != null) {
+            HikeDurationService.DurationResult result = hikeDurationService.calculate(
+                    form.getAltitudeDifference(), form.getDistance());
+            model.addAttribute("result", result);
+        }
+        return "calculator";
+    }
+}
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+package de.pitfriedrich.hikebuddy.calculator;
+
+public class HikeDurationForm {
+
+    private Integer altitudeDifference;
+    private Double distance;
+
+    public Integer getAltitudeDifference() {
+        return altitudeDifference;
+    }
+
+    public void setAltitudeDifference(Integer altitudeDifference) {
+        this.altitudeDifference = altitudeDifference;
+    }
+
+    public Double getDistance() {
+        return distance;
+    }
+
+    public void setDistance(Double distance) {
+        this.distance = distance;
+    }
+}
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+package de.pitfriedrich.hikebuddy.calculator;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class HikeDurationService {
+
+    public record DurationResult(long hours, long minutes) {}
+
+    public DurationResult calculate(int altitudeDifferenceMeters, double distanceKm) {
+        double v1 = altitudeDifferenceMeters / 300.0;
+        double v2 = distanceKm / 4.0;
+        double min = Math.min(v1, v2);
+        double max = Math.max(v1, v2);
+        double durationHours = max + 0.5 * min;
+        long totalMinutes = Math.round(durationHours * 60);
+        return new DurationResult(totalMinutes / 60, totalMinutes % 60);
+    }
+}
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+spring:
+  application:
+    name: hikebuddy
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+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org" lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>HikeBuddy — Duration Calculator</title>
+    <style>
+        body { font-family: sans-serif; max-width: 480px; margin: 48px auto; padding: 0 16px; }
+        h1 { font-size: 1.5rem; margin-bottom: 8px; }
+        h2 { font-size: 1.1rem; margin-bottom: 24px; color: #555; font-weight: normal; }
+        label { display: block; margin-top: 16px; font-weight: bold; }
+        input[type=number] { display: block; width: 100%; padding: 8px; margin-top: 4px; font-size: 1rem; box-sizing: border-box; border: 1px solid #ccc; border-radius: 4px; }
+        button { margin-top: 24px; padding: 10px 24px; font-size: 1rem; background: #2d6a2d; color: white; border: none; border-radius: 4px; cursor: pointer; }
+        button:hover { background: #235023; }
+        .result { margin-top: 32px; padding: 16px; background: #f0f7f0; border-left: 4px solid #2d6a2d; border-radius: 4px; }
+        .result span { font-size: 1.4rem; font-weight: bold; }
+    </style>
+</head>
+<body>
+    <h1>HikeBuddy</h1>
+    <h2>Hike Duration Calculator</h2>
+
+    <form th:action="@{/calculator}" th:object="${form}" method="post">
+        <label for="altitudeDifference">Altitude Difference (m)</label>
+        <input type="number" id="altitudeDifference" th:field="*{altitudeDifference}" min="0" placeholder="e.g. 500" required>
+
+        <label for="distance">Distance (km)</label>
+        <input type="number" id="distance" th:field="*{distance}" min="0" step="0.1" placeholder="e.g. 10" required>
+
+        <button type="submit">Calculate</button>
+    </form>
+
+    <div class="result" th:if="${result}">
+        Estimated duration:
+        <span th:text="${result.hours() + 'h ' + result.minutes() + 'm'}"></span>
+    </div>
+</body>
+</html>
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+package de.pitfriedrich.hikebuddy;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class HikebuddyApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}