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<?php
require_once 'config.php';
include_once 'class/class.php';
session_start();

// Functies voor taakbeheer
functions::taakAanmelden();

// Verkrijg de maand, jaar en weergave (week/maand) van de URL
$current_month = isset($_GET['month']) ? (int) $_GET['month'] : (int) date('m');
$current_year = isset($_GET['year']) ? (int) $_GET['year'] : (int) date('Y');
$view = isset($_GET['view']) ? $_GET['view'] : 'month'; // Default is 'month'

// Bereken de start- en einddatum van de week (zondag tot zaterdag)
$first_day_of_month = "$current_year-$current_month-01";
if ($view === 'week') {
    $week_start_date = isset($_GET['week_start']) ? strtotime($_GET['week_start']) : strtotime("last sunday", strtotime("$current_year-$current_month-01"));
    $week_end_date = isset($_GET['week_end']) ? strtotime($_GET['week_end']) : strtotime("next saturday", $week_start_date);
} else {
    // Maandweergave
    $week_start_date = strtotime("$current_year-$current_month-01"); // Eerste dag van de maand
    $week_end_date = strtotime("last day of this month", $week_start_date); // Laatste dag van de maand
}

// Verwerk navigatieacties
if (isset($_GET['action'])) {
    if ($view === 'week') {
        if ($_GET['action'] === 'week_up') {
            // Volgende week (1 week verder)
            $week_start_date = strtotime("+1 week", $week_start_date);
            $week_end_date = strtotime("+1 week", $week_end_date);
        } elseif ($_GET['action'] === 'week_down') {
            // Vorige week (1 week terug)
            $week_start_date = strtotime("-1 week", $week_start_date);
            $week_end_date = strtotime("-1 week", $week_end_date);
        }
    } elseif ($view === 'month') {
        if ($_GET['action'] === 'month_up') {
            $current_month++;
            if ($current_month > 12) {
                $current_month = 1;
                $current_year++;
            }
        } elseif ($_GET['action'] === 'month_down') {
            $current_month--;
            if ($current_month < 1) {
                $current_month = 12;
                $current_year--;
            }
        } elseif ($_GET['action'] === 'year_up') {
            $current_year++;
        } elseif ($_GET['action'] === 'year_down') {
            $current_year--;
        }
    }

    // Verwerk jaar navigatie
    if ($_GET['action'] === 'year_up') {
        $current_year++;
    } elseif ($_GET['action'] === 'year_down') {
        $current_year--;
    }
}

// Verkrijg de taken voor de maand/week
$start_date = date('Y-m-d', $week_start_date); // Start van de week
$end_date = date('Y-m-d', $week_end_date); // Eind van de week

// Verkrijg de taken voor de maand
$stmt = $pdo->prepare("
    SELECT tasks.*, 
           (SELECT COUNT(*) FROM task_registrations WHERE task_id = tasks.id) AS registrations_count
    FROM tasks
    WHERE date BETWEEN :start_date AND :end_date
");
$stmt->bindParam(':start_date', $start_date); // Bind startdatum
$stmt->bindParam(':end_date', $end_date); // Bind einddatum
$stmt->execute();
$tasks = $stmt->fetchAll(PDO::FETCH_ASSOC);

// Verkrijg de geregistreerde taken van de ingelogde gebruiker
$registered_task_ids = [];
if (isset($_SESSION['user_id'])) {
    $user_id = $_SESSION['user_id'];
    $registration_stmt = $pdo->prepare("SELECT task_id FROM task_registrations WHERE user_id = :user_id");
    $registration_stmt->bindParam(':user_id', $user_id, PDO::PARAM_INT);
    $registration_stmt->execute();
    $registered_task_ids = $registration_stmt->fetchAll(PDO::FETCH_COLUMN);
}

// Functie om taken voor een specifieke dag te verkrijgen
function getTasksForDay($day, $tasks)
{
    $tasks_for_day = [];
    foreach ($tasks as $task) {
        if (date('j', strtotime($task['date'])) == $day) {
            $tasks_for_day[] = $task;
        }
    }
    return $tasks_for_day;
}
?>

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