<?php
require 'config.php';

// --- ACTION HANDLERS ---

// 1. Add Feed
if (isset($_POST['add_feed'])) {
    $stmt = $pdo->prepare("INSERT INTO feeds (site_name, rss_url, group_id) VALUES (?, ?, ?)");
    $stmt->execute([$_POST['site_name'], $_POST['rss_url'], $_POST['group_id']]);
    header("Location: index.php");
    exit;
}

// 2. Add Group
if (isset($_POST['add_group'])) {
    $stmt = $pdo->prepare("INSERT INTO `groups` (name) VALUES (?)");
    $stmt->execute([$_POST['group_name']]);
    header("Location: index.php");
    exit;
}

// 3. Delete Feed
if (isset($_POST['delete_feed'])) {
    $stmt = $pdo->prepare("DELETE FROM feeds WHERE id = ?");
    $stmt->execute([$_POST['feed_id_to_delete']]);
    header("Location: index.php");
    exit;
}

// 4. Edit Feed
if (isset($_POST['edit_feed'])) {
    $stmt = $pdo->prepare("UPDATE feeds SET site_name = ?, rss_url = ?, group_id = ? WHERE id = ?");
    $stmt->execute([
        $_POST['edit_site_name'], 
        $_POST['edit_rss_url'], 
        $_POST['edit_group_id'], 
        $_POST['edit_feed_id']
    ]);
    header("Location: index.php");
    exit;
}

// 5. Mark as Read (Updated with Undo Memory)
if (isset($_GET['mark_read'])) {
    $id = $_GET['mark_read'];
    
    // Update DB
    $stmt = $pdo->prepare("UPDATE items SET is_read = 1, is_saved = 0 WHERE id = ?");
    $stmt->execute([$id]);

    // SAVE ID TO SESSION FOR UNDO
    $_SESSION['undo_entry_id'] = $id;

    // Redirect logic (Same as before)
    $params = [];
    if (isset($_GET['view'])) $params[] = "view=" . $_GET['view'];
    if (isset($_GET['group_id'])) $params[] = "group_id=" . $_GET['group_id'];
    $redirect = count($params) > 0 ? "?" . implode("&", $params) : "index.php";
    header("Location: $redirect");
    exit;
}
// 6. Save/Unsave Logic
if (isset($_GET['save_item'])) {
    $stmt = $pdo->prepare("UPDATE items SET is_saved = 1 WHERE id = ?");
    $stmt->execute([$_GET['save_item']]);
    $params = [];
    if (isset($_GET['view'])) $params[] = "view=" . $_GET['view'];
    if (isset($_GET['group_id'])) $params[] = "group_id=" . $_GET['group_id'];
    $redirect = count($params) > 0 ? "?" . implode("&", $params) : "index.php";
    header("Location: $redirect");
    exit;
}
if (isset($_GET['unsave_item'])) {
    $stmt = $pdo->prepare("UPDATE items SET is_saved = 0 WHERE id = ?");
    $stmt->execute([$_GET['unsave_item']]);
    $params = [];
    $params[] = "view=" . ($_GET['view'] ?? 'saved');
    if (isset($_GET['group_id'])) $params[] = "group_id=" . $_GET['group_id'];
    $redirect = "?" . implode("&", $params);
    header("Location: $redirect");
    exit;
}

// 7. NEW: Undo Handler
if (isset($_GET['undo_action'])) {
    if (isset($_SESSION['undo_entry_id'])) {
        // Revert the last item to Unread (is_read = 0)
        $stmt = $pdo->prepare("UPDATE items SET is_read = 0 WHERE id = ?");
        $stmt->execute([$_SESSION['undo_entry_id']]);
        
        // Clear the session so the button disappears
        unset($_SESSION['undo_entry_id']);
    }

    // Redirect logic to keep you on the same page
    $params = [];
    if (isset($_GET['view'])) $params[] = "view=" . $_GET['view'];
    if (isset($_GET['group_id'])) $params[] = "group_id=" . $_GET['group_id'];
    $redirect = count($params) > 0 ? "?" . implode("&", $params) : "index.php";
    header("Location: $redirect");
    exit;
}

// --- DATA FETCHING ---
$groups = $pdo->query("SELECT * FROM `groups`")->fetchAll();

// Fetch all feeds for the management modal
$all_feeds = $pdo->query("SELECT feeds.*, groups.name as group_name FROM feeds LEFT JOIN `groups` ON feeds.group_id = groups.id ORDER BY site_name ASC")->fetchAll();

$view_mode = $_GET['view'] ?? 'unread'; 
$filter_group_id = $_GET['group_id'] ?? null;

// Build SQL
$sql = "SELECT items.id AS item_id, items.title, items.link, items.description, items.pub_date, feeds.site_name 
        FROM items JOIN feeds ON items.feed_id = feeds.id ";
$params = [];

if ($view_mode === 'saved') {
    $sql .= "WHERE is_saved = 1 ";
} else {
    $sql .= "WHERE is_read = 0 AND is_saved = 0 ";
}

if ($filter_group_id) {
    $sql .= "AND feeds.group_id = ? ";
    $params[] = $filter_group_id;
}
$sql .= "ORDER BY pub_date DESC LIMIT 50";

$stmt = $pdo->prepare($sql);
$stmt->execute($params);
$items = $stmt->fetchAll();
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>RSS Catcher</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
    <style>
        .sidebar { height: 100vh; overflow-y: auto; position: fixed; width: 25%; }
        .main-content { margin-left: 25%; width: 75%; }
        .nav-link.active { background-color: #0d6efd; color: white !important; }
    </style>
</head>
<body class="bg-light">

<div class="container-fluid">
    <div class="row">
        <div class="col-md-3 bg-white p-4 border-end sidebar">
            <h3 class="mb-4">RSS Catcher</h3>
            
            <div class="list-group mb-4">
                <a href="index.php" class="list-group-item list-group-item-action <?= ($view_mode == 'unread' && !$filter_group_id) ? 'active' : '' ?>">
                    📥 All Unread
                </a>
                <a href="?view=saved" class="list-group-item list-group-item-action <?= ($view_mode == 'saved') ? 'active' : '' ?>">
                    ⭐ Saved for Later
                </a>
            </div>

            <h6 class="text-muted text-uppercase small">Filter by Group</h6>
            <div class="list-group mb-4">
                <?php foreach($groups as $g): ?>
                    <a href="?group_id=<?= $g['id'] ?>" 
                       class="list-group-item list-group-item-action d-flex justify-content-between align-items-center <?= ($filter_group_id == $g['id']) ? 'active' : '' ?>">
                       <?= htmlspecialchars($g['name']) ?>
                    </a>
                <?php endforeach; ?>
            </div>

            <hr>

            <div class="d-grid gap-2">
                <button class="btn btn-outline-dark btn-sm" data-bs-toggle="modal" data-bs-target="#manageFeedsModal">
                    🛠 Manage Feeds (Edit/Delete)
                </button>
                
                <div class="accordion" id="adminControls">
                    <div class="accordion-item">
                        <h2 class="accordion-header">
                            <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#addControls">
                                ⚙️ Add New
                            </button>
                        </h2>
                        <div id="addControls" class="accordion-collapse collapse" data-bs-parent="#adminControls">
                            <div class="accordion-body">
                                <form method="post" class="mb-3">
                                    <label class="form-label small">New Group</label>
                                    <div class="input-group input-group-sm">
                                        <input type="text" name="group_name" class="form-control" required>
                                        <button class="btn btn-secondary" name="add_group">+</button>
                                    </div>
                                </form>

                                <form method="post">
                                    <label class="form-label small">New Feed</label>
                                    <input type="text" name="site_name" class="form-control form-control-sm mb-2" placeholder="Site Name" required>
                                    <input type="url" name="rss_url" class="form-control form-control-sm mb-2" placeholder="RSS URL" required>
                                    <select name="group_id" class="form-select form-select-sm mb-2">
                                        <?php foreach($groups as $g): ?>
                                            <option value="<?= $g['id'] ?>"><?= $g['name'] ?></option>
                                        <?php endforeach; ?>
                                    </select>
                                    <button class="btn btn-primary btn-sm w-100" name="add_feed">Add Feed</button>
                                </form>
                            </div>
                        </div>
                    </div>
                </div>
                <a href="fetch.php" class="btn btn-success btn-sm">Force Refresh</a>
            </div>
        </div>

        <div class="col-md-9 p-4 main-content">
            <div class="d-flex justify-content-between align-items-center mb-4">
                
                <h2>
                    <?php 
                    $count_label = " <small class='text-muted'>(" . count($items) . ")</small>";
                    if ($view_mode === 'saved') echo "⭐ Saved Articles" . $count_label;
                    elseif ($filter_group_id) echo "📂 Group View" . $count_label;
                    else echo "📥 Unread Articles" . $count_label;
                    ?>
                </h2>

                <?php if (isset($_SESSION['undo_entry_id'])): ?>
    <div class="alert alert-warning d-flex justify-content-between align-items-center mb-3">
        <span>✅ Article marked as read.</span>
        
        <?php 
            $undoParams = "undo_action=true";
            if (isset($_GET['view'])) $undoParams .= "&view=" . $_GET['view'];
            if (isset($_GET['group_id'])) $undoParams .= "&group_id=" . $_GET['group_id'];
        ?>
        
        <a href="?<?= $undoParams ?>" class="btn btn-sm btn-dark">↩ Undo</a>
    </div>
<?php endif; ?>
            </div>

            <?php if (count($items) === 0): ?>
                <div class="alert alert-info">No articles found in this view.</div>
            <?php endif; ?>

            <div class="row">
                <?php foreach($items as $item): ?>
                <div class="col-12 mb-3">
                    <div class="card shadow-sm">
                        <div class="card-body">
                            <h5 class="card-title">
                                <a href="<?= $item['link'] ?>" target="_blank" class="text-decoration-none text-dark">
                                    <?= htmlspecialchars($item['title']) ?>
                                </a>
                            </h5>
                            <h6 class="card-subtitle mb-2 text-muted small">
                                <?= htmlspecialchars($item['site_name']) ?> | <?= date('M j, g:i a', strtotime($item['pub_date'])) ?>
                            </h6>
                            <p class="card-text text-secondary">
                                <?= strip_tags(substr($item['description'], 0, 250)) ?>...
                            </p>
                            
                            <div class="d-flex gap-2">
                                <?php 
                                    $contextParams = "&view=" . $view_mode;
                                    if ($filter_group_id) $contextParams .= "&group_id=" . $filter_group_id;
                                ?>
                                <a href="?mark_read=<?= $item['item_id'] ?><?= $contextParams ?>" class="btn btn-sm btn-outline-secondary">Mark as Read</a>

                                <?php if($view_mode === 'saved'): ?>
                                    <a href="?unsave_item=<?= $item['item_id'] ?><?= $contextParams ?>" class="btn btn-sm btn-warning">Remove from Saved</a>
                                <?php else: ?>
                                    <a href="?save_item=<?= $item['item_id'] ?><?= $contextParams ?>" class="btn btn-sm btn-outline-primary">⭐ Save for Later</a>
                                <?php endif; ?>
                            </div>
                        </div>
                    </div>
                </div>
                <?php endforeach; ?>
            </div>
        </div>
    </div>
</div>

<div class="modal fade" id="manageFeedsModal" tabindex="-1">
    <div class="modal-dialog modal-lg">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title">Manage Feeds</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <div class="modal-body">
                <table class="table table-striped table-sm">
                    <thead>
                        <tr>
                            <th>Name</th>
                            <th>Group</th>
                            <th>Actions</th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach($all_feeds as $f): ?>
                        <tr>
                            <td><?= htmlspecialchars($f['site_name']) ?></td>
                            <td><?= htmlspecialchars($f['group_name']) ?></td>
                            <td>
                                <button class="btn btn-sm btn-primary" 
                                        onclick="openEditModal(<?= $f['id'] ?>, '<?= addslashes($f['site_name']) ?>', '<?= addslashes($f['rss_url']) ?>', <?= $f['group_id'] ?>)">
                                    Edit
                                </button>
                                <form method="post" style="display:inline;" onsubmit="return confirm('Delete this feed and ALL its articles?');">
                                    <input type="hidden" name="feed_id_to_delete" value="<?= $f['id'] ?>">
                                    <button class="btn btn-sm btn-danger" name="delete_feed">Delete</button>
                                </form>
                            </td>
                        </tr>
                        <?php endforeach; ?>
                    </tbody>
                </table>
            </div>
        </div>
    </div>
</div>

<div class="modal fade" id="editFeedModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content">
            <form method="post">
                <div class="modal-header">
                    <h5 class="modal-title">Edit Feed</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <div class="modal-body">
                    <input type="hidden" name="edit_feed_id" id="edit_feed_id">
                    
                    <div class="mb-3">
                        <label>Site Name</label>
                        <input type="text" name="edit_site_name" id="edit_site_name" class="form-control" required>
                    </div>
                    <div class="mb-3">
                        <label>RSS URL</label>
                        <input type="url" name="edit_rss_url" id="edit_rss_url" class="form-control" required>
                    </div>
                    <div class="mb-3">
                        <label>Group</label>
                        <select name="edit_group_id" id="edit_group_id" class="form-select">
                            <?php foreach($groups as $g): ?>
                                <option value="<?= $g['id'] ?>"><?= $g['name'] ?></option>
                            <?php endforeach; ?>
                        </select>
                    </div>
                </div>
                <div class="modal-footer">
                    <button class="btn btn-primary" name="edit_feed">Save Changes</button>
                </div>
            </form>
        </div>
    </div>
</div>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
<script>
    function openEditModal(id, name, url, groupId) {
        // Populate fields
        document.getElementById('edit_feed_id').value = id;
        document.getElementById('edit_site_name').value = name;
        document.getElementById('edit_rss_url').value = url;
        document.getElementById('edit_group_id').value = groupId;
        
        // Open Modal
        var myModal = new bootstrap.Modal(document.getElementById('editFeedModal'));
        myModal.show();
    }
</script>
</body>
</html>