<?php
require_once 'includes/db.php';

if (session_status() === PHP_SESSION_NONE) {
    session_start();
}

if (!isset($_SESSION['user_id']) || !isset($_GET['id'])) {
    echo '<div class="alert alert-danger m-3">Invalid Request</div>';
    exit;
}

$task_id = intval($_GET['id']);
$companyId = getCurrentCompanyId();

// Fetch Task Details
$query = "
    SELECT t.*, 
           p.title as property_title, p.address as property_address,
           c.name as client_name, c.email as client_email,
           a.name as assigned_name, a.email as assigned_email,
           creator.name as creator_name
    FROM tasks t 
    LEFT JOIN properties p ON t.property_id = p.id 
    LEFT JOIN users c ON t.client_id = c.id 
    LEFT JOIN users a ON t.assigned_to = a.id 
    LEFT JOIN users creator ON t.created_by = creator.id
    WHERE t.id = ?
";
$params = [$task_id];

if ($companyId) {
    $query .= " AND t.company_id = ?";
    $params[] = $companyId;
}

$stmt = $pdo->prepare($query);
$stmt->execute($params);
$task = $stmt->fetch(PDO::FETCH_ASSOC);

if (!$task) {
    echo '<div class="alert alert-danger m-3">Task not found</div>';
    exit;
}

// Fetch Staff for Assignment Dropdown
if ($companyId) {
    $staff_stmt = $pdo->prepare("SELECT id, name FROM users WHERE role IN ('admin', 'super_admin', 'operations', 'operations_manager', 'estate_manager', 'sales_agent') AND company_id = ? ORDER BY name");
    $staff_stmt->execute([$companyId]);
} else {
    $staff_stmt = $pdo->query("SELECT id, name FROM users WHERE role IN ('admin', 'super_admin', 'operations', 'operations_manager', 'estate_manager', 'sales_agent') ORDER BY name");
}
$staff_members = $staff_stmt->fetchAll(PDO::FETCH_ASSOC);

$statusClass = match($task['status']) {
    'pending' => 'bg-secondary bg-opacity-10 text-secondary',
    'in_progress' => 'bg-primary bg-opacity-10 text-primary',
    'completed' => 'bg-success bg-opacity-10 text-success',
    'cancelled' => 'bg-danger bg-opacity-10 text-danger',
    default => 'bg-light text-dark'
};

$priorityClass = match($task['priority']) {
    'urgent' => 'text-danger fw-bold',
    'high' => 'text-danger',
    'medium' => 'text-warning',
    'low' => 'text-success',
    default => 'text-muted'
};
?>

<div class="p-4">
    <!-- Header Info -->
    <div class="d-flex justify-content-between align-items-start mb-4">
        <div>
            <span class="badge <?= $statusClass ?> mb-2"><?= ucfirst(str_replace('_', ' ', $task['status'])) ?></span>
            <h4 class="mb-1 text-navy fw-bold"><?= htmlspecialchars($task['title']) ?></h4>
            <div class="text-muted small">
                Created by <?= htmlspecialchars($task['creator_name']) ?> on <?= date('M d, Y @ h:i A', strtotime($task['created_at'])) ?>
            </div>
        </div>
        <div class="text-end">
             <div class="<?= $priorityClass ?> text-uppercase fw-bold small mb-1">
                <i class="fas fa-flag me-1"></i><?= $task['priority'] ?> Priority
            </div>
        </div>
    </div>

    <!-- Main Details Grid -->
    <div class="row g-4 mb-4">
        <!-- Related Context -->
        <?php if($task['property_title'] || $task['client_name']): ?>
        <div class="col-12">
            <div class="card bg-light border-0">
                <div class="card-body">
                    <div class="row">
                        <?php if($task['property_title']): ?>
                        <div class="col-md-6 mb-3 mb-md-0">
                            <h6 class="text-uppercase text-muted small fw-bold mb-2">Related Property</h6>
                            <div class="d-flex align-items-center">
                                <div class="avatar-sm bg-white rounded text-primary d-flex align-items-center justify-content-center me-2 shadow-sm">
                                    <i class="fas fa-building"></i>
                                </div>
                                <div>
                                    <div class="fw-bold text-dark"><?= htmlspecialchars($task['property_title']) ?></div>
                                    <div class="small text-muted"><?= htmlspecialchars($task['property_address']) ?></div>
                                </div>
                            </div>
                        </div>
                        <?php endif; ?>
                        
                        <?php if($task['client_name']): ?>
                        <div class="col-md-6">
                            <h6 class="text-uppercase text-muted small fw-bold mb-2">Related Client</h6>
                            <div class="d-flex align-items-center">
                                <div class="avatar-sm bg-white rounded text-success d-flex align-items-center justify-content-center me-2 shadow-sm">
                                    <i class="fas fa-user"></i>
                                </div>
                                <div>
                                    <div class="fw-bold text-dark"><?= htmlspecialchars($task['client_name']) ?></div>
                                    <div class="small text-muted"><?= htmlspecialchars($task['client_email']) ?></div>
                                </div>
                            </div>
                        </div>
                        <?php endif; ?>
                    </div>
                </div>
            </div>
        </div>
        <?php endif; ?>

        <!-- Description -->
        <div class="col-12">
            <h6 class="text-uppercase text-muted small fw-bold mb-2">Description</h6>
            <div class="p-3 bg-white border rounded">
                <?= nl2br(htmlspecialchars($task['description'] ?: 'No description provided.')) ?>
            </div>
        </div>
    </div>

    <hr class="my-4 opacity-25">

    <!-- Management Actions -->
    <h5 class="fw-bold text-navy mb-3"><i class="fas fa-tasks me-2"></i>Update Task</h5>
    
    <form action="tasks.php" method="POST">
        <input type="hidden" name="action" value="update_status">
        <input type="hidden" name="task_id" value="<?= $task['id'] ?>">

        <div class="row g-3">
            <!-- Status -->
            <div class="col-md-6">
                <label class="form-label small fw-bold text-muted">Status</label>
                <select name="status" class="form-select">
                    <option value="pending" <?= $task['status'] == 'pending' ? 'selected' : '' ?>>Pending</option>
                    <option value="in_progress" <?= $task['status'] == 'in_progress' ? 'selected' : '' ?>>In Progress</option>
                    <option value="completed" <?= $task['status'] == 'completed' ? 'selected' : '' ?>>Completed</option>
                    <option value="cancelled" <?= $task['status'] == 'cancelled' ? 'selected' : '' ?>>Cancelled</option>
                </select>
            </div>

            <!-- Priority -->
             <div class="col-md-6">
                <label class="form-label small fw-bold text-muted">Priority</label>
                <select name="priority" class="form-select">
                    <option value="low" <?= $task['priority'] == 'low' ? 'selected' : '' ?>>Low</option>
                    <option value="medium" <?= $task['priority'] == 'medium' ? 'selected' : '' ?>>Medium</option>
                    <option value="high" <?= $task['priority'] == 'high' ? 'selected' : '' ?>>High</option>
                    <option value="urgent" <?= $task['priority'] == 'urgent' ? 'selected' : '' ?>>Urgent</option>
                </select>
            </div>

            <!-- Assignment -->
            <div class="col-md-6">
                <label class="form-label small fw-bold text-muted">Assigned To</label>
                <select name="assigned_to" class="form-select">
                    <option value="">-- Unassigned --</option>
                    <?php foreach ($staff_members as $staff): ?>
                        <option value="<?= $staff['id'] ?>" <?= $task['assigned_to'] == $staff['id'] ? 'selected' : '' ?>>
                            <?= htmlspecialchars($staff['name']) ?>
                        </option>
                    <?php endforeach; ?>
                </select>
            </div>

            <!-- Due Date -->
            <div class="col-md-6">
                <label class="form-label small fw-bold text-muted">Due Date</label>
                <input type="datetime-local" name="due_date" class="form-control" 
                       value="<?= $task['due_date'] ? date('Y-m-d\TH:i', strtotime($task['due_date'])) : '' ?>">
            </div>

             <!-- Edit Description -->
             <div class="col-12">
                <label class="form-label small fw-bold text-muted">Edit Description</label>
                <textarea name="description" class="form-control" rows="3"><?= htmlspecialchars($task['description']) ?></textarea>
            </div>
        </div>

        <div class="d-grid mt-4">
            <button type="submit" class="btn btn-primary">
                <i class="fas fa-save me-2"></i>Save Changes
            </button>
        </div>
    </form>
</div>