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<!DOCTYPE html>
<html lang="en" data-theme="dark">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="description" content="Ultimate Operating Systems Storage Subsystem & Hardware Architecture Lab - Featuring Classical Schedulers, Linux Kernel Schedulers (Deadline, CFQ, NOOP), SSD Flash Architecture, 3D Multi-Platter CHS/LBA, and In-Browser Code Sandbox." />
<title>Disk Scheduling Simulator & OS Storage Architecture Lab</title>
<!-- Google Fonts: Plus Jakarta Sans & JetBrains Mono -->
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap" rel="stylesheet">
<link rel="stylesheet" href="project.css" />
</head>
<body>
<div class="app-wrapper">
<!-- Top Navigation / Header -->
<header class="app-header">
<div class="header-brand">
<div class="brand-icon">
<svg viewBox="0 0 24 24" width="28" height="28" stroke="currentColor" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round">
<circle cx="12" cy="12" r="10"></circle>
<circle cx="12" cy="12" r="3"></circle>
<line x1="12" y1="2" x2="12" y2="5"></line>
<line x1="12" y1="19" x2="12" y2="22"></line>
<line x1="2" y1="12" x2="5" y2="12"></line>
<line x1="19" y1="12" x2="22" y2="12"></line>
</svg>
</div>
<div>
<h1>Disk Scheduling Simulator</h1>
<p class="subtitle">OS Storage Architecture Lab & Hardware Physics Suite</p>
</div>
</div>
<div class="header-actions">
<!-- Device Mode Toggle -->
<div class="device-mode-toggle">
<button id="deviceHddBtn" class="device-pill active" title="Mechanical Hard Disk Drive (Magnetic Platters)">๐ฝ HDD Mode</button>
<button id="deviceSsdBtn" class="device-pill" title="NAND Flash Solid State Drive (Zero Seek Penalty)">โก SSD Mode</button>
</div>
<!-- Preset Dropdown -->
<div class="quick-preset-group">
<label for="presetSelect" class="sr-only">Preset Workloads</label>
<select id="presetSelect" class="select-preset" title="Load Preset Workload">
<option value="" disabled selected>โก Presets...</option>
<option value="silberschatz">Silberschatz OS Standard (Head: 53)</option>
<option value="stallings">Stallings Benchmark (Head: 100)</option>
<option value="clustered">Clustered Cylinder Requests</option>
<option value="extremes">Boundary / Extreme Cylinders</option>
</select>
</div>
<button id="randomBtn" class="btn btn-secondary btn-sm" title="Generate Random Workload">
๐ฒ Randomize
</button>
<!-- Export Dropdown -->
<div class="dropdown-wrapper">
<button id="exportMenuBtn" class="btn btn-secondary btn-sm" title="Export Solution & Data">
๐พ Export โพ
</button>
<div id="exportMenu" class="dropdown-menu">
<button id="exportSolutionBtn" class="dropdown-item">๐ Homework Solution (.md)</button>
<button id="exportCsvBtn" class="dropdown-item">๐ Telemetry Data (.csv)</button>
<button id="exportPngBtn" class="dropdown-item">๐ผ๏ธ Canvas Snapshot (.png)</button>
</div>
</div>
<!-- Voice Narration Toggle -->
<button id="voiceToggleBtn" class="btn btn-icon btn-secondary btn-sm" title="Toggle AI Voice Narration" aria-label="Toggle Voice">
<span id="voiceIcon">๐๏ธ</span>
</button>
<!-- Audio Toggle -->
<button id="audioToggleBtn" class="btn btn-icon btn-secondary btn-sm" title="Toggle Sound Effects" aria-label="Toggle Sound">
<span id="audioIcon">๐</span>
</button>
<!-- Theme Switcher -->
<button id="themeToggleBtn" class="btn btn-icon btn-secondary btn-sm" title="Switch Light / Dark Theme [T]" aria-label="Toggle Theme">
<span id="themeIcon">๐</span>
</button>
</div>
</header>
<!-- Main 3-Column Workspace -->
<main class="main-container">
<!-- Left Panel: Configuration, Hardware Physics & Metrics -->
<aside class="panel config-panel">
<div class="panel-header">
<div class="panel-title-wrap">
<span class="panel-icon">โ๏ธ</span>
<h3>Configuration</h3>
</div>
<!-- Live Stream Toggle -->
<button id="liveStreamToggleBtn" class="badge-toggle" title="Auto-stream incoming requests to test starvation">
<span class="stream-dot"></span> Live I/O Stream
</button>
</div>
<form id="configForm" onsubmit="return false;">
<div class="form-group">
<div class="label-with-action">
<label for="requests">Disk Requests / Sectors:</label>
<span class="badge" id="requestCountBadge">8 items</span>
</div>
<input type="text" id="requests" class="form-input mono" placeholder="e.g. 98, 183, 37, 122, 14, 124, 65, 67" value="98, 183, 37, 122, 14, 124, 65, 67" required />
<span class="field-hint">Tip: Click directly on Canvas to add requests live!</span>
</div>
<div class="form-row">
<div class="form-group flex-1">
<label for="head">Initial Head:</label>
<input type="number" id="head" class="form-input mono" value="53" min="0" required />
</div>
<div class="form-group flex-1">
<label for="maxCylinder">Max Cylinder:</label>
<input type="number" id="maxCylinder" class="form-input mono" value="199" min="1" required />
</div>
</div>
<div class="form-group">
<label for="algorithm">Scheduling Algorithm:</label>
<div class="custom-select-wrap">
<select id="algorithm" class="form-input">
<optgroup label="Classical OS Algorithms">
<option value="FCFS">FCFS (First-Come, First-Served)</option>
<option value="SSTF" selected>SSTF (Shortest Seek Time First)</option>
<option value="SCAN">SCAN (Elevator Algorithm)</option>
<option value="CSCAN">C-SCAN (Circular SCAN)</option>
<option value="LOOK">LOOK (Optimized Elevator)</option>
<option value="CLOOK">C-LOOK (Circular LOOK)</option>
<option value="FSCAN">F-SCAN (Freeze-Queue SCAN)</option>
<option value="NSTEPSCAN">N-Step SCAN (Batched SCAN)</option>
<option value="USER_ORDER">User Input Order (Raw Sequence)</option>
</optgroup>
<optgroup label="Modern Linux Kernel Schedulers">
<option value="DEADLINE">Linux Deadline Scheduler (Read/Write FIFO)</option>
<option value="CFQ">Linux CFQ (Completely Fair Queuing)</option>
<option value="NOOP">Linux NOOP / None (NVMe SSD Optimal)</option>
</optgroup>
</select>
</div>
</div>
<!-- N-Step batch size input (shown only when NSTEPSCAN is active) -->
<div class="form-group" id="nStepGroup" style="display: none;">
<label for="nStepSize">Batch Size (N):</label>
<input type="number" id="nStepSize" class="form-input mono" value="4" min="2" max="20" />
</div>
<!-- Direction selector -->
<div class="form-group" id="directionGroup">
<label for="direction">Initial Head Direction:</label>
<div class="direction-toggle-group">
<label class="direction-btn">
<input type="radio" name="direction" value="high" checked />
<span>โ Higher (Right)</span>
</label>
<label class="direction-btn">
<input type="radio" name="direction" value="low" />
<span>โ Lower (Left)</span>
</label>
</div>
</div>
<!-- Hardware Physics & Spindle Specs -->
<div class="hardware-specs-toggle-wrap">
<button id="togglePhysicsBtn" type="button" class="btn-text-toggle">
โ๏ธ Hardware Drive Physics (RPM & Latency) โพ
</button>
</div>
<div id="physicsDrawer" class="physics-drawer" style="display: none;">
<div class="form-row">
<div class="form-group flex-1">
<label for="rpmSelect">Drive RPM:</label>
<select id="rpmSelect" class="form-input">
<option value="5400">5,400 RPM (Laptop)</option>
<option value="7200" selected>7,200 RPM (Desktop)</option>
<option value="10000">10,000 RPM (VelociRaptor)</option>
<option value="15000">15,000 RPM (Enterprise)</option>
</select>
</div>
<div class="form-group flex-1">
<label for="trackSeekTime">Track Seek Rate:</label>
<input type="number" id="trackSeekTime" class="form-input mono" value="0.15" step="0.01" min="0.01" title="ms per cylinder seek" />
</div>
</div>
<!-- CHS / LBA Calculator -->
<div class="chs-calculator-box">
<span class="chs-title">๐ CHS โ LBA Addressing Calculator</span>
<div class="chs-inputs-row">
<input type="number" id="chsCyl" class="form-input mono chs-mini" placeholder="Cyl" value="53" title="Cylinder" />
<input type="number" id="chsHead" class="form-input mono chs-mini" placeholder="Head" value="2" title="Head (0-3)" />
<input type="number" id="chsSec" class="form-input mono chs-mini" placeholder="Sec" value="15" title="Sector (1-63)" />
<span id="chsLbaResult" class="chs-res-badge">LBA: 13,370</span>
</div>
</div>
</div>
<div class="action-buttons-group">
<button id="startBtn" type="button" class="btn btn-primary btn-glow">
<span>โถ Run Simulation</span>
</button>
<button id="compareBtn" type="button" class="btn btn-accent" title="Run all algorithms side-by-side">
<span>๐ Compare All (10)</span>
</button>
</div>
</form>
<!-- Live Performance & Hardware Physics Telemetry Card -->
<div class="metrics-card">
<div class="metrics-card-header">
<h4 id="telemetryCardTitle">Performance & Latency Telemetry</h4>
<span class="status-indicator live" id="liveStatusDot"></span>
</div>
<div class="metrics-grid">
<div class="metric-item">
<span class="metric-label" id="seekMetricLabel">Total Head Movement</span>
<div class="metric-value-wrap">
<span id="totalSeek" class="metric-value">0</span>
<span class="metric-unit" id="seekMetricUnit">cyl</span>
</div>
</div>
<div class="metric-item">
<span class="metric-label">Estimated Seek Time</span>
<div class="metric-value-wrap">
<span id="totalSeekTimeMs" class="metric-value">0.00</span>
<span class="metric-unit">ms</span>
</div>
</div>
<div class="metric-item">
<span class="metric-label">Avg Rotational Delay</span>
<div class="metric-value-wrap">
<span id="rotDelayMs" class="metric-value">4.17</span>
<span class="metric-unit">ms</span>
</div>
</div>
<div class="metric-item">
<span class="metric-label">Total Est. Access Time</span>
<div class="metric-value-wrap">
<span id="totalAccessTimeMs" class="metric-value">0.00</span>
<span class="metric-unit">ms</span>
</div>
</div>
<div class="metric-item">
<span class="metric-label">Head Reversals</span>
<div class="metric-value-wrap">
<span id="reversalsCount" class="metric-value">0</span>
<span class="metric-unit">times</span>
</div>
</div>
<div class="metric-item">
<span class="metric-label">Progress</span>
<div class="metric-value-wrap">
<span id="currentStepDisplay" class="metric-value">0</span>
<span class="metric-unit">/ <span id="totalSteps">0</span></span>
</div>
</div>
</div>
<div class="progress-bar-container">
<div class="progress-bar-fill" id="progressBarFill" style="width: 0%;"></div>
</div>
</div>
</aside>
<!-- Center Panel: Visualization Studio, Sandbox & Quiz Arena -->
<section class="panel visualizer-panel">
<!-- Tab Navigation Bar -->
<div class="view-tabs-header">
<div class="tabs-group">
<button id="tabTrack" class="tab-btn active" data-view="track">๐ฏ 1D Track</button>
<button id="tabGraph" class="tab-btn" data-view="graph">๐ 2D Graph</button>
<button id="tabPlatter" class="tab-btn" data-view="platter">๐ฝ Platter 2D</button>
<button id="tab3DStack" class="tab-btn" data-view="stack3d">๐ฝ 3D Cylinder</button>
<button id="tabSsd" class="tab-btn" data-view="ssd">โก SSD Flash</button>
<button id="tabLinux" class="tab-btn" data-view="linux">๐ง Linux Kernel</button>
<button id="tabSandbox" class="tab-btn" data-view="sandbox">๐ป Code Sandbox</button>
<button id="tabComparison" class="tab-btn" data-view="comparison">๐ Comparison</button>
<button id="tabQuiz" class="tab-btn" data-view="quiz">๐ Quiz Arena</button>
</div>
<div class="canvas-badge-info" id="viewModeBadge">
Interactive 1D Physical Track (Click to Add I/O)
</div>
</div>
<!-- Canvas & Multi-View Container -->
<div class="canvas-wrapper" id="canvasWrapper">
<canvas id="diskCanvas" width="900" height="460"></canvas>
<div id="canvasTooltip" class="canvas-tooltip"></div>
<!-- Interactive Canvas Click Banner -->
<div id="clickToInjectBanner" class="click-inject-banner">
๐ฑ๏ธ Click anywhere on the canvas to inject a real-time request!
</div>
<!-- Code Sandbox Overlay Panel -->
<div id="sandboxOverlay" class="sandbox-overlay" style="display: none;">
<div class="sandbox-editor-wrapper">
<div class="sandbox-toolbar">
<span class="sandbox-title">๐ป Custom Scheduling Algorithm JavaScript Sandbox</span>
<div class="sandbox-actions">
<button id="sandboxResetBtn" class="btn btn-secondary btn-sm">โบ Reset Template</button>
<button id="sandboxRunBtn" class="btn btn-primary btn-sm">โถ Run My Algorithm</button>
</div>
</div>
<textarea id="sandboxCodeEditor" class="sandbox-textarea mono" spellcheck="false"></textarea>
<div id="sandboxConsoleLog" class="sandbox-console mono">Console output ready...</div>
</div>
</div>
<!-- Quiz Interactive Overlay Container -->
<div id="quizOverlay" class="quiz-overlay" style="display: none;">
<div class="quiz-card">
<div class="quiz-header">
<div class="quiz-badge-wrap">
<span class="quiz-badge">๐ OS Exam Lab</span>
<span id="quizStreakBadge" class="streak-badge">๐ฅ Streak: 0</span>
</div>
<div class="quiz-score-wrap">
Score: <strong id="quizScore">0</strong> / <span id="quizTotal">0</span>
</div>
</div>
<div class="quiz-question-box">
<h4 id="quizQuestionText">Loading Question...</h4>
<div id="quizScenarioDetails" class="quiz-scenario-mono"></div>
</div>
<div class="quiz-options-grid" id="quizOptionsGrid">
<!-- Option buttons generated dynamically -->
</div>
<div id="quizFeedbackBox" class="quiz-feedback-box" style="display: none;">
<p id="quizFeedbackText"></p>
<button id="quizNextBtn" class="btn btn-primary btn-sm">Next Question โ</button>
</div>
</div>
</div>
</div>
<!-- Interactive Timeline Scrubber Bar -->
<div class="timeline-scrubber-container">
<span class="timeline-label">Timeline:</span>
<input type="range" id="timelineScrubber" min="0" max="0" value="0" step="1" class="timeline-slider" disabled />
<span id="timelineStepBadge" class="timeline-step-badge">Step 0 / 0</span>
</div>
<!-- Media Playback Toolbar -->
<div class="playback-toolbar">
<div class="playback-controls-group">
<button id="jumpStartBtn" class="btn btn-control btn-icon-only" title="Jump to Beginning [Home]" disabled>โฎ</button>
<button id="prevBtn" class="btn btn-control btn-icon-only" title="Previous Step [Left Arrow]" disabled>โ</button>
<button id="playBtn" class="btn btn-control btn-play-pause" title="Play Animation [Space]" disabled>
<span id="playBtnIcon">โถ</span>
<span id="playBtnText">Play</span>
</button>
<button id="pauseBtn" class="btn btn-control btn-play-pause" title="Pause Animation [Space]" style="display: none;">
<span>โธ</span>
<span>Pause</span>
</button>
<button id="nextBtn" class="btn btn-control btn-icon-only" title="Next Step [Right Arrow]" disabled>โถ</button>
<button id="jumpEndBtn" class="btn btn-control btn-icon-only" title="Jump to End [End]" disabled>โญ</button>
<button id="resetBtn" class="btn btn-control" title="Reset View [R]" disabled>๐ Reset</button>
</div>
<div class="speed-slider-group">
<span class="speed-icon">โฑ๏ธ</span>
<label for="speedSlider">Speed:</label>
<input type="range" id="speedSlider" min="1" max="5" value="3" step="1" />
<span id="speedValue" class="speed-badge">3x</span>
</div>
</div>
<!-- Keyboard Shortcuts Help Ribbon -->
<div class="keyboard-hints">
<span>Shortcuts:</span>
<kbd>Space</kbd> Play/Pause
<kbd>โ</kbd> Prev
<kbd>โ</kbd> Next
<kbd>Home</kbd> / <kbd>End</kbd> First/Last
<kbd>R</kbd> Reset
<kbd>T</kbd> Theme
<kbd>V</kbd> Voice
</div>
</section>
<!-- Right Panel: Algorithm Theory & Live Breakdown -->
<aside class="panel explanation-panel">
<div class="panel-header">
<div class="panel-title-wrap">
<span class="panel-icon">๐ก</span>
<h3>Analysis & Logs</h3>
</div>
</div>
<!-- Algorithm Theoretical Profile Card -->
<div class="card-section">
<div class="section-title-wrap">
<h4 id="algoTitle">Algorithm Profile</h4>
<span id="algoTag" class="tag tag-indigo">SSTF</span>
</div>
<div id="algorithmDescription" class="description-box">
<p>Select an algorithm and press <strong>Run Simulation</strong> to view real-time behavioral insights.</p>
</div>
<div class="algo-specs-grid" id="algoSpecsGrid" style="display: none;">
<div class="spec-chip">
<span class="spec-lbl">Complexity:</span>
<strong id="specComplexity">O(Nยฒ)</strong>
</div>
<div class="spec-chip">
<span class="spec-lbl">Starvation:</span>
<strong id="specStarvation">Possible</strong>
</div>
<div class="spec-chip">
<span class="spec-lbl">Directional:</span>
<strong id="specDirectional">No</strong>
</div>
</div>
</div>
<!-- Live Step Math & Latency Telemetry -->
<div class="card-section">
<h4>Live Step Mechanics</h4>
<div id="stepDetails" class="step-details-box">
<div class="empty-state-text">Simulation awaiting start...</div>
</div>
</div>
<!-- Dynamic Service Order Chips -->
<div class="card-section flex-expand">
<div class="label-with-action">
<h4>Service Order Path</h4>
<span class="sub-hint">Click step to jump</span>
</div>
<div id="serviceOrderChips" class="service-chips-container">
<div class="empty-state-text">Run simulation to generate path.</div>
</div>
</div>
</aside>
</main>
</div>
<script src="project.js"></script>
</body>
</html>