<?php

declare(strict_types=1);

if ($_SERVER["REQUEST_METHOD"] == "POST") {

    $inputs = [
        "username" => $_POST["username"],
        "pwd" => $_POST["pwd"]
    ];

    try {
        require_once "dbh.inc.php";
        require_once "login_model.inc.php";
        require_once "login_view.inc.php";
        require_once "login_contr.inc.php";

        $errors = [];

        if (isEmpty($inputs)) {
            $errors = ["null_field" => "Form contains blank characters."];
        }

        if (!does_user_exist($pdo, $inputs["username"])) {
            $errors = ["incorrect_credentials" => "Incorrect credentials"];
        } else {
            if (!does_Password_match($pdo, $inputs["username"], $inputs["pwd"])){
                $errors = ["incorrect_credentials" => "Incorrect credentials"];
            }
        }

        require_once "config_session.inc.php";

        if ($errors) {

            $_SESSION["errors"] = $errors;

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

            $_SESSION["entered_login_data"] = $entered_data;

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

        $_SESSION["username"] = htmlspecialchars($inputs["username"]); 

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