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

if (!isset($_SESSION['user_id']) || $_SESSION['user_role'] !== 'coach') {
    // Redirect non-coaches or non-logged-in users
    header('Location: login.php');
    exit;
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $coach_id = $_SESSION['user_id'];
    $date = $_POST['date'];
    $start_time = $_POST['start_time'];
    $end_time = $_POST['end_time'];

    // Validation (basic)
    if (empty($date) || empty($start_time) || empty($end_time)) {
        header('Location: dashboard.php?status=error&message=All+fields+are+required');
        exit;
    }

    $start_datetime = $date . ' ' . $start_time;
    $end_datetime = $date . ' ' . $end_time;

    // Check if end time is after start time
    if (strtotime($start_datetime) >= strtotime($end_datetime)) {
        header('Location: dashboard.php?status=error&message=End+time+must+be+after+start+time');
        exit;
    }

    try {
        $stmt = db()->prepare("INSERT INTO coach_availability (coach_id, start_time, end_time) VALUES (?, ?, ?)");
        $stmt->execute([$coach_id, $start_datetime, $end_datetime]);

        header('Location: dashboard.php?status=success&message=Availability+added+successfully');
        exit;
    } catch (PDOException $e) {
        // Log error and redirect
        error_log('Error adding availability: ' . $e->getMessage());
        header('Location: dashboard.php?status=error&message=Could+not+add+availability');
        exit;
    }
}

// Redirect if accessed directly without POST
header('Location: dashboard.php');
exit;