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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Chapter 10: HTML APIs</title>
<link rel="stylesheet" href="style.css">
<style>
  /* Drag & Drop Styles */
  #div1 {
    width: 150px;
    height: 50px;
    background: #c0f0c0;
    text-align: center;
    line-height: 50px;
    margin-bottom: 10px;
    cursor: grab;
  }

  #div2 {
    width: 200px;
    height: 60px;
    border: 1px solid #000;
    text-align: center;
    line-height: 60px;
    margin-top: 10px;
  }

  /* Buttons spacing */
  .tag-demo button {
    margin: 5px 5px 5px 0;
  }

  /* Worker output styling */
  #worker-result {
    font-weight: bold;
    margin-left: 10px;
  }
</style>
</head>
<body>

<h2 class="chapter-header">Chapter 10: HTML APIs</h2>

<!-- Drag and Drop -->
<div class="tag-section">
<h3>Drag and Drop</h3>
<div class="tag-demo">
<div class="head-demo">
<h5>Draggable Div</h5>
<div id="div1" draggable="true">Drag me</div>
<div id="div2">Drop here</div>
<script>
const draggable = document.getElementById("div1");
const dropzone = document.getElementById("div2");

draggable.addEventListener("dragstart", (ev) => {
  ev.dataTransfer.setData("text", ev.target.id);
});

dropzone.addEventListener("dragover", (ev) => {
  ev.preventDefault();
});

dropzone.addEventListener("drop", (ev) => {
  ev.preventDefault();
  const data = ev.dataTransfer.getData("text");
  const draggedEl = document.getElementById(data);
  draggedEl.style.display = "none"; // hide after drop
  dropzone.textContent = "Dropped!";
});
</script>
</div>
</div>
</div>

<!-- Geolocation -->
<div class="tag-section">
<h3>Geolocation</h3>
<div class="tag-demo">
<div class="head-demo">
<h5>Get User Coordinates</h5>
<button onclick="getLocation()">Get Location</button>
<p id="geo-out"></p>
<script>
function getLocation() {
  const x = document.getElementById("geo-out");
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(position){
      x.innerHTML = "Latitude: " + position.coords.latitude + "<br>Longitude: " + position.coords.longitude;
    }, function(){
      x.innerHTML = "Unable to retrieve location.";
    });
  } else {
    x.innerHTML = "Geolocation not supported";
  }
}
</script>
</div>
</div>
</div>

<!-- Web Storage -->
<div class="tag-section">
<h3>Web Storage</h3>
<div class="tag-demo">
<div class="head-demo">
<h5>Local Storage Example</h5>
<input type="text" id="name-local" placeholder="Enter name"/>
<button onclick="setLocal()">Set Local Storage</button>
<button onclick="getLocal()">Get Local Storage</button>
<script>
function setLocal() {
  localStorage.myName = document.getElementById('name-local').value;
}
function getLocal() {
  alert(localStorage.myName || "No value stored");
}
</script>

<h5>Session Storage Example</h5>
<input type="text" id="name-session" placeholder="Enter name"/>
<button onclick="setSession()">Set Session Storage</button>
<button onclick="getSession()">Get Session Storage</button>
<script>
function setSession() {
  sessionStorage.myName = document.getElementById('name-session').value;
}
function getSession() {
  alert(sessionStorage.myName || "No value stored");
}
</script>
</div>
</div>
</div>

<!-- Web Workers -->
<div class="tag-section">
<h3>Web Workers</h3>
<div class="tag-demo">
<div class="head-demo">
<h5>Web Worker Counter</h5>
<p>Count numbers: <output id="worker-result">0</output></p>
<button onclick="startWorker()">Start Worker</button>
<button onclick="stopWorker()">Stop Worker</button>
<script>
let w;

function startWorker() {
    if (typeof Worker !== "undefined") {
        if (typeof w === "undefined") {
            const workerCode = `
                let counter = 0;
                const interval = setInterval(() => {
                    counter++;
                    postMessage(counter);
                }, 1000);
                onmessage = function(event) {
                    if (event.data === 'stop') {
                        clearInterval(interval);
                        close();
                    }
                };
            `;
            const blob = new Blob([workerCode], { type: "application/javascript" });
            const blobURL = URL.createObjectURL(blob);
            w = new Worker(blobURL);
        }
        w.onmessage = function(event) {
            document.getElementById('worker-result').textContent = event.data;
        };
    } else {
        alert("Web Workers not supported");
    }
}

function stopWorker() {
    if (w) {
        w.terminate();
        w = undefined;
    }
}
</script>
</div>
</div>
</div>

</body>
</html>