<?php

declare(strict_types=1);

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    try {
        require_once "dbh.inc.php";
        require_once "chat_send_model.inc.php";
        require_once "chat_send_view.inc.php";  
        require_once "chat_send_contr.inc.php";
        require_once "config_session.inc.php";

        $errors = [];

        // Check if user is logged in, if not do not check for other errors.
        if (is_user_logged_in()){
            $inputs = ["username"=>$_SESSION["username"],"message_content"=>$_POST["message_content"]];

            if (isEmpty($inputs)) {
                $errors = ["null_field" => "Form contains blank characters."];
            }
            if (!user_exists($pdo, $inputs["username"])) {
                $errors = ["inexistent_user" => "User does not exist on db."];
            }
        } else {
            $errors = ["not_logged_in" => "You haven't logged in."];
        } 

        if ($errors) {
            $_SESSION["errors"] = $errors;

            // Send back form
            $entered_data = [
                "message_content" => $inputs["message_content"]
            ];

            $_SESSION["entered_chat_data"] = $entered_data;

            header("Location: ../chat.php");
            $inputs = null;
            die();
        }

        send_message($pdo, $inputs["username"], $inputs["message_content"]);

        header("Location: ../chat.php");
        $inputs = null;
        die();
    } catch (PDOException $e) {
        echo "An error has ocurred: " . $e->getMessage();
        exit();
    }
    
} else {
    echo "Wrong request type, please check your request.";
    exit();
}