<?php

require __DIR__.'/../vendor/autoload.php';

use Carbon\Carbon;

// Simulate the scenario:
// Admin stored times: 09:00 - 14:00 (in Denver time)
// Date from CarbonPeriod: 2026-01-26
// Timezone: America/Denver

$date = Carbon::parse('2026-01-26 00:00:00', 'UTC'); // Date from period (in UTC)
$startTimeStr = '09:00:00';
$endTimeStr = '14:00:00';
$timezone = 'America/Denver';
$slotDuration = 45;

echo "=== TEST SCENARIO ===\n";
echo "Date from CarbonPeriod: {$date->toIso8601String()}\n";
echo "Stored start_time: {$startTimeStr}\n";
echo "Stored end_time: {$endTimeStr}\n";
echo "Timezone: {$timezone}\n\n";

// MY FIX - Parse directly in target timezone
$startTime = Carbon::parse("{$date->format('Y-m-d')} {$startTimeStr}", $timezone);
$endTime = Carbon::parse("{$date->format('Y-m-d')} {$endTimeStr}", $timezone);

echo "=== WITH MY FIX ===\n";
echo "Start time: {$startTime->toIso8601String()} ({$startTime->format('g:i A')})\n";
echo "End time: {$endTime->toIso8601String()} ({$endTime->format('g:i A')})\n\n";

// Generate slots
echo "=== GENERATED SLOTS ===\n";
$current = $startTime->copy();
$slots = [];
while ($current->copy()->addMinutes($slotDuration)->lte($endTime)) {
    $slots[] = $current->format('g:i A');
    $current->addMinutes($slotDuration);
}
echo implode(', ', $slots)."\n\n";

// OLD BUGGY CODE for comparison
echo "=== OLD BUGGY CODE ===\n";
$startTimeBuggy = $date->copy()->setTimezone($timezone)->setTimeFromTimeString($startTimeStr);
$endTimeBuggy = $date->copy()->setTimezone($timezone)->setTimeFromTimeString($endTimeStr);
echo "Start time: {$startTimeBuggy->toIso8601String()} ({$startTimeBuggy->format('g:i A')})\n";
echo "End time: {$endTimeBuggy->toIso8601String()} ({$endTimeBuggy->format('g:i A')})\n";

$currentBuggy = $startTimeBuggy->copy();
$slotsBuggy = [];
while ($currentBuggy->copy()->addMinutes($slotDuration)->lte($endTimeBuggy)) {
    $slotsBuggy[] = $currentBuggy->format('g:i A');
    $currentBuggy->addMinutes($slotDuration);
}
echo 'Slots: '.implode(', ', $slotsBuggy)."\n";