<?php

    /**
     * Controller file.
     *
     * Provides a class to handle all posible request.
     * 
     * @category Constroller
     */

    /**
     * Include some required files.
     */
    require_once(__DIR__ . "/config.php");
    require_once(PATH::HELPER . "DB_Helper.php");
    require_once(PATH::HELPER . "TEXT_Helper.php");
    require_once(PATH::HELPER . "NET_Helper.php");
    require_once(PATH::HELPER . "HTML_Helper.php");
    require_once(PATH::HELPER . "APPLICATION_Helper.php");
    require_once(PATH::ENTITY . "User.php");
    require_once(PATH::ENTITY . "Player.php");
    require_once(__DIR__ . "/Constant.php");

    /**
     * @global User $USER.
     */
    $USER = -1;

    /**
     * @global Player $PLAYER.
     */
    $PLAYER = -1;

    /**
     * @global int $MODE.
     */
    $MODE = GAME_MODE_ID::NORMAL;

    /**
     * @global resource $DB.
     */
    $db = null;

    /**
     * Application controller.
     *
     * Handles every request, creating the required models and selecting the
     * view.
     *
     * @category Controller
     */
    class Controller {

        /**
         * Constructor.
         *
         * Handles every request, creating the required models and selecting the
         * view.
         *
         * @param mixed[] $params POST parameters of the request.
         * @return int HTTP status codes 200 or 404;
         * @global int User ID.
         * @global resource Databse connection.
         */
        public function __construct($params){

            global $USER;
            global $PLAYER;
            global $MODE;
            global $db;

            $page = null;

            session_start();
            $db = DB::start();

            // Parse parameters, get lang and build the route.
            $pars = [];
            foreach($params as $p){
                if (strlen($p) > 0){
                    array_push($pars, $p);
                }
            }

            // API call: Use API controller
            if (count($pars) > 0 && strtoupper($pars[0]) == "API"){
                if (count($pars) == 1){
                    // TODO: API MAIN PAGE
                }
                else{
                    $version = strtolower($pars[1]);
                    $api_params = $pars;
                    array_shift($api_params);
                    array_shift($api_params);
                    switch ($version){
                        case "v1":
                            require_once(__DIR__ . "/API/v1/API_Controller.php");
                            new API_Controller($params);
                            break;
                        case "v2":
                            require_once(__DIR__ . "/API/v2/API_Controller.php");
                            new API_Controller($params);
                            break;
                        case "v3":
                            require_once(__DIR__ . "/API/v3/API_Controller.php");
                            new API_Controller($params);
                            break;
                    }
                }
                return;
            }
            // Special case: Actions.
            // Not redirecting to page, just execute a function
            // TODO: Secure actions
            elseif (count($pars) > 1 && strtoupper($pars[0]) == "ACTION"){
                switch (strtoupper($pars[1])){
                    case "CHANGE_GAME_MODE":
                        require_once(PATH::ACTION . "change_game_mode.php");
                        action();
                        return;
                        break;
                    case "LOGIN":
                        require_once(PATH::ACTION . "login.php");
                        action();
                        return;
                        break;
                    case "LOGOUT":
                        require_once(PATH::ACTION . "logout.php");
                        action();
                        return;
                        break;
                    case "NEW_TEAM":
                        require_once(PATH::ACTION . "new_team.php");
                        action();
                        return;
                        break;
                    case "DELETE_TEAM":
                        require_once(PATH::ACTION . "delete_team.php");
                        action();
                        return;
                        break;
                    case "RATE_TEAM":
                        require_once(PATH::ACTION . "rate_team.php");
                        action();
                        return;
                        break;
                    case "SAVE_RUN_TEAM":
                        require_once(PATH::ACTION . "save_run_team.php");
                        action();
                        return;
                        break;
                    case "OPTIMIZE_GET_RUNE_LIST":
                        require_once(PATH::ACTION . "optimize_get_rune_list.php");
                        $response = action();
                        if (strlen($response) > 1){
                            echo($response);
                            return;
                        }
                        else{
                            return;
                        }
                        break;
                    case "OPTIMIZE_GET_OPTIONS":
                        require_once(PATH::ACTION . "optimize_get_options.php");
                        $response = action();
                        if (strlen($response) > 1){
                            echo($response);
                            return;
                        }
                        else{
                            return;
                        }
                        break;
                    case "EDIT_PROFILE":
                        require_once(PATH::ACTION . "edit_profile.php");
                        $response = action();
                        if (strlen($response) > 1){
                            echo($response);
                            return;
                        }
                        else{
                            return;
                        }
                        break;
                    default:
                        require_once(PATH::PAGE . "Error_Page.php");
                        $page = new Error_Page(404);
                        http_response_code(404);
                }
            }

            // Authentication
            $USER = null;

            if (array_key_exists("user_token", $_COOKIE) && array_key_exists("user_id", $_COOKIE)){
                // Authenticated user, check token.
                $statement = $db->prepare("
                  SELECT count(token) AS c
                  FROM token
                  WHERE
                    user = :user AND
                    token = :token AND
                    strftime('%s', datetime(expiry, 'unixepoch', 'localtime')) > strftime('%s','now')
                ");
                $statement->bindValue(":user", $_COOKIE["user_id"], SQLITE3_INTEGER);
                $statement->bindValue(":token", hash('sha256', $_COOKIE["user_token"]), SQLITE3_TEXT);
                $r = $statement->execute()->fetchArray(SQLITE3_ASSOC);
                if ($r["c"] == 0){
                    // Token is invalid, expired, clear cookies, session, and logout.
                    require_once(PATH::ACTION . "logout.php");
                    action();
                    return;
                }
                else{
                    // Token is valid, renew session, and assign user.
                    $_SESSION["user_id"] = $_COOKIE["user_id"];
                    $_SESSION["session"] = true;
                    $USER = new User($_COOKIE["user_id"]);
                }

            }
            else{
                // Unauthenticated user. Continue
            }


            // Validate URL (check if it has the player ID).
            $PLAYER = null;
            if (sizeof($pars) > 0 && preg_match("/^[0-9]{6,12}$/", $pars[0]) == 1){
error_log("PLAYER IN URL: " . $pars[0]);
                // Player ID passed in URL. Check it in database
                $statement = $db->prepare("
                  SELECT
                    id,
                    user,
                    public
                  FROM player
                  WHERE id = :id
                ");
                $statement->bindValue(":id", $pars[0], SQLITE3_TEXT);
                $r = $statement->execute()->fetchArray(SQLITE3_ASSOC);
                if ($r){
                    // The player exists...
                    if (null != $USER && $r["user"] == $USER->id){
                        // ... and it belongs to the user. Proceed.
                        $PLAYER = new Player($r["id"]);
error_log("PLAYER SET: " . $PLAYER->id);
                    }
                    elseif (null == $USER || $r["user"] != $USER->id){
                        // ... and it doesn't belong to the user...
                        if ($r["public"] == 1){
                            // ... and it belongs to a public profile. Proceed.
                            $PLAYER = new Player($r[$id]);
                        }
                        else{
                            // ... and it belongs to a private profile. Deny access.
                            // TODO
                        }
                    }
                }
            }
            else{
error_log("PLAYER NOT IN URL: ");
                // Player ID is not passed as URL...
                if (null == $USER){
error_log("    USER NOT LOGGED IN: ");
                    // ... and no user logged in. Go to the landing page.
                    require_once(PATH::PAGE . "Landing_Page.php");
                    $page = new Landing_Page();
                    require_once($page->view);
                    return;
                }
                else{
error_log("    USER LOGGED IN: " . $USER->id);
                    // ... and the user is logged in. Get last accessed account.
                    $statement = $db->prepare("
                      SELECT id
                      FROM player
                      WHERE user = :user
                      ORDER BY last_access DESC
                    ");
                    $statement->bindValue(":user", $USER->id, SQLITE3_INTEGER);
                    $r = $statement->execute()->fetchArray(SQLITE3_ASSOC);
                    if ($r){
                        header("Location: /" . $r["id"] . parse_url($_SERVER["REQUEST_URI"], PHP_URL_PATH));
                        return;
                    }
                    else{
                        require_once(PATH::PAGE . "Landing_Page.php");
                        $page = new Landing_Page();
                        require_once($page->view);
                        return;
                    }
                }
            }

            // Get game mode
            $statement = $db->prepare("SELECT mode FROM player WHERE id = :id;");
            $statement->bindValue(":id", $PLAYER->id, SQLITE3_INTEGER);
            $r = $statement->execute()->fetchArray(SQLITE3_ASSOC);
            if ($r && $r["mode"] == GAME_MODE_ID::RTA){
                $MODE = GAME_MODE_ID::RTA;
            }
            else{
                $MODE = GAME_MODE_ID::NORMAL;
            }

            // Select the model to load.
            array_shift($pars); // Remove first one, should be player_id
            if (sizeof($pars) == 0){
                require_once(PATH::PAGE . "Home_Page.php");
                $page = new Home_Page();
            }
            else{
                if (strtoupper($pars[0]) == "FUSION"){
                    require_once(PATH::PAGE . "Fusion_Page.php");
                    $page = new Fusion_Page();
                }
                elseif (strtoupper($pars[0]) == "RUNES"){
                    require_once(PATH::PAGE . "Runes_Page.php");
                    $page = new Runes_Page();
                }
                elseif (strtoupper($pars[0]) == "ENCHANTMENTS"){
                    require_once(PATH::PAGE . "Enchantments_Page.php");
                    $page = new Enchantments_Page();
                }
                elseif (strtoupper($pars[0]) == "ARTIFACTS"){
                    require_once(PATH::PAGE . "Artifacts_Page.php");
                    $page = new Artifacts_Page();
                }
                elseif (strtoupper($pars[0]) == "GUILD"){
                    require_once(PATH::PAGE . "Guild_Page.php");
                    $page = new Guild_Page();
                }
                elseif (strtoupper($pars[0]) == "RUNS"){
                    require_once(PATH::PAGE . "Runs_Page.php");
                    $page = new Runs_Page();
                }
                elseif (strtoupper($pars[0]) == "STATS"){
                    require_once(PATH::PAGE . "Stats_Page.php");
                    $page = new Stats_Page();
                }
                elseif (strtoupper($pars[0]) == "TEAMS"){
                    require_once(PATH::PAGE . "Teams_Page.php");
                    $page = new Teams_Page();
                }
                elseif (strtoupper($pars[0]) == "PROFILE"){
                    require_once(PATH::PAGE . "Profile_Page.php");
                    $page = new Profile_Page();
                }
                elseif (strtoupper($pars[0]) == "MONSTERS"){
                    if (count($pars) == 1){
                        require_once(PATH::PAGE . "Monsters_Page.php");
                        $page = new Monsters_Page();
                    }
                    else{
                        require_once(PATH::PAGE . "Monster_Page.php");
                        $page = new Monster_Page($pars[1]);
                    }
                }
                elseif (strtoupper($pars[0]) == "CATALOG"){
                    if (count($pars) == 1){
                        require_once(PATH::PAGE . "Catalog_Page.php");
                        $page = new Catalog_Page();
                    }
                    else{
                        require_once(PATH::PAGE . "Monster_Info_Page.php");
                        $page = new Monster_Info_Page($pars[1]);
                    }
                }
                elseif (strtoupper($pars[0]) == "REPORT"){
                    if (count($pars) == 1){
                        require_once(PATH::PAGE . "Report_Page.php");
                        $page = new Report_Page();
                    }
                    elseif (strtoupper($pars[1]) == "SKILLUP"){
                        require_once(PATH::PAGE . "Report_Skillup_Page.php");
                        $page = new Report_Skillup_Page($pars[1]);
                    }
                    elseif (strtoupper($pars[1]) == "RUNE_ENCHANTMENT"){
                        require_once(PATH::PAGE . "Report_Rune_Enchantment_Page.php");
                        $page = new Report_Rune_Enchantment_Page($pars[1]);
                    }
                }
                elseif (strtoupper($pars[0]) == "OPTIMIZER"){
                    if (count($pars) == 1){
                        require_once(PATH::PAGE . "Optimizer_Page.php");
                        $page = new Optimizer_Page();
                    }
                    else{
                        require_once(PATH::PAGE . "Optimizer_Unit_Page.php");
                        $page = new Optimizer_Unit_Page($pars[1]);
                    }
                }
            }
            // Load the view, or set an error code.
            if (isset($page)){
                require_once($page->view);
                return 200;
            }
            else{
                require_once(PATH::PAGE . "Error_Page.php");
                $page = new Error_Page(404);
                http_response_code(404);
                return 404;
            }
        }
    }
?>