<?php
/**
 * API Endpoint: Get Transmissions
 * Returns transmissions for calendar view in FullCalendar format
 */

require_once __DIR__ . '/../vendor/autoload.php';
require_once __DIR__ . '/../helpers.php';

use Dotenv\Dotenv;

$dotenv = Dotenv::createImmutable(__DIR__ . '/..');
$dotenv->load();

header('Content-Type: application/json');

try {
    $db = getDbConnection();
    
    // Get date range from query parameters
    $start = $_GET['start'] ?? date('Y-m-d', strtotime('-7 days'));
    $end = $_GET['end'] ?? date('Y-m-d', strtotime('+30 days'));
    $channel = $_GET['channel'] ?? null;
    
    // Ensure daily blocks exist for this date range
    ensureDailyBlocks($db, $start, $end);
    
    // Build query
    $sql = "
        SELECT 
            t.id,
            t.commercial_id,
            t.channel,
            t.template,
            t.start_date,
            t.start_time,
            t.duration,
            t.api_status,
            c.title,
            c.color_code,
            c.series_code
        FROM transmissions t
        JOIN commercials c ON t.commercial_id = c.id
        WHERE t.start_date BETWEEN ? AND ?
    ";
    
    $params = [$start, $end];
    
    if ($channel) {
        $sql .= " AND t.channel = ?";
        $params[] = $channel;
    }
    
    $sql .= " ORDER BY t.start_date, t.start_time";
    
    $stmt = $db->prepare($sql);
    $stmt->execute($params);
    $transmissions = $stmt->fetchAll();
    
    // Format for FullCalendar
    $events = [];
    foreach ($transmissions as $tx) {
        // Calculate end time
        $startDateTime = new DateTime($tx['start_date'] . ' ' . $tx['start_time']);
        $endDateTime = clone $startDateTime;
        
        if ($tx['duration']) {
            list($h, $m, $s) = explode(':', $tx['duration']);
            $endDateTime->add(new DateInterval("PT{$h}H{$m}M{$s}S"));
        }
        
        $events[] = [
            'id' => $tx['id'],
            'title' => $tx['title'],
            'start' => $startDateTime->format('Y-m-d\TH:i:s'),
            'end' => $endDateTime->format('Y-m-d\TH:i:s'),
            'resourceId' => $tx['channel'],
            'backgroundColor' => $tx['color_code'] ?? '#cccccc',
            'borderColor' => $tx['color_code'] ?? '#cccccc',
            'textColor' => '#ffffff',
            'extendedProps' => [
                'commercial_id' => $tx['commercial_id'],
                'template' => $tx['template'],
                'duration' => $tx['duration'],
                'api_status' => $tx['api_status'],
                'series_code' => $tx['series_code']
            ]
        ];
    }
    
    jsonResponse($events);
    
} catch (Exception $e) {
    jsonResponse([
        'error' => true,
        'message' => $e->getMessage()
    ], 500);
}