<?php
/**
 * Controller file.
 *
 * Provides a class to handle all posible request.
 * 
 * @author Iñigo Valentin <i@inigovalentin.com>
 * @license https://www.gnu.org/licenses/gpl-3.0.en.html GNU General Public License V3
 * @package SWDB
 */

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");
require_once(__DIR__ . "/Context.php");

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

    /**
     * @var string[] GET parameters received by the controller.
     */
    private $params = [];

    /**
     * @var Context Publicly available context.
     */
    private $context;

    /**
     * Retrieves the application context.
     * 
     * @return Context The context.
     */
    public function get_context(){
        return $this->context;
    }

    /**
     * Controller constructor.
     *
     * Initializes a database connection and sets up the public context.
     */
    public function __construct(){
        $this->context = new Context();
        session_start();
        $this->db = DB::start();
        $this->context->set_db($this->db);
    }

    /**
     * Handles the request parameters.
     *
     * Receives the request params and gets itself ready. Authenticates the user (if needed)
     * and validates the URL.
     *
     * @param string[] $params GET parameters of the request.
     */
    public function prepare($params){

        // Parse parameters.
        foreach($params as $p){
            if (strlen($p) > 0){
                array_push($this->params, $p);
            }
        }

        if (
          count($this->params) > 1 && 
          strtoupper($this->params[0]) == "API"
        ){
            // For API calls, skip authentication and end here.
            return;
        }

        // Authentication
        if (array_key_exists("user_token", $_COOKIE) && array_key_exists("user_id", $_COOKIE)){
            // Authenticated user, check token.
            $statement = $this->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;
                $this->user = new User($_COOKIE["user_id"]);
                $this->context->set_user($this->user);
            }

        }
        else{
            // Unauthenticated user. Continue
        }
        
        if (
            count($this->params) > 1 &&
            strtoupper($this->params[0]) == "ACTION"
            ){
                // For ACTION calls, skip user detection and end here.
                return;
        }

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

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

    }

    /**
     * Executes the required action.
     *
     * Must be called after {@see Controller::prepare()}.
     * @return void|number
     */
    public function action(){
        // API call: Use API controller
        if (count($this->params) > 0 && strtoupper($this->params[0]) == "API"){
            if (count($this->params) == 1){
                // TODO: API MAIN PAGE
            }
            else{
                $version = strtolower($this->params[1]);
                $api_params = $this->params;
                array_shift($api_params);
                array_shift($api_params);
                switch ($version){
                    case "v1":
                        require_once(__DIR__ . "/API/v1/API_Controller.php");
                        new API_Controller($this->params);
                        break;
                }
            }
            return;
        }
        // Special case: Actions.
        // Not redirecting to page, just execute a function
        // TODO: Secure actions
        elseif (count($this->params) > 1 && strtoupper($this->params[0]) == "ACTION"){
            switch (strtoupper($this->params[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);
            }
        }

        // Select the model to load.
        array_shift($this->params); // Remove first one, should be player_id
        if (sizeof($this->params) == 0){
            require_once(PATH::PAGE . "Home_Page.php");
            $page = new Home_Page();
        }
        else{
            if (strtoupper($this->params[0]) == "RUNES"){
                require_once(PATH::PAGE . "Runes_Page.php");
                $page = new Runes_Page();
            }
            elseif (strtoupper($this->params[0]) == "ENCHANTMENTS"){
                require_once(PATH::PAGE . "Enchantments_Page.php");
                $page = new Enchantments_Page();
            }
            elseif (strtoupper($this->params[0]) == "ARTIFACTS"){
                require_once(PATH::PAGE . "Artifacts_Page.php");
                $page = new Artifacts_Page();
            }
            elseif (strtoupper($this->params[0]) == "GUILD"){
                require_once(PATH::PAGE . "Guild_Page.php");
                $page = new Guild_Page();
            }
            elseif (strtoupper($this->params[0]) == "RUNS"){
                require_once(PATH::PAGE . "Runs_Page.php");
                $page = new Runs_Page();
            }
            elseif (strtoupper($this->params[0]) == "STATS"){
                require_once(PATH::PAGE . "Stats_Page.php");
                $page = new Stats_Page();
            }
            elseif (strtoupper($this->params[0]) == "TEAMS"){
                require_once(PATH::PAGE . "Teams_Page.php");
                $page = new Teams_Page();
            }
            elseif (strtoupper($this->params[0]) == "PROFILE"){
                require_once(PATH::PAGE . "Profile_Page.php");
                $page = new Profile_Page();
            }
            elseif (strtoupper($this->params[0]) == "UNITS"){
                if (count($this->params) == 1){
                    require_once(PATH::PAGE . "Units_Page.php");
                    $page = new Units_Page();
                }
                else{
                    require_once(PATH::PAGE . "Unit_Page.php");
                    $page = new Unit_Page($this->params[1]);
                }
            }
            elseif (strtoupper($this->params[0]) == "MONSTERS"){
                if (count($this->params) == 1){
                    require_once(PATH::PAGE . "Monsters_Page.php");
                    $page = new Monsters_Page();
                }
                else{
                    require_once(PATH::PAGE . "Monster_Page.php");
                    $page = new Monster_Page($this->params[1]);
                }
            }
            elseif (strtoupper($this->params[0]) == "REPORT"){
                if (count($this->params) == 1){
                    require_once(PATH::PAGE . "Report_Page.php");
                    $page = new Report_Page();
                }
                elseif (strtoupper($this->params[1]) == "SKILLUP"){
                    require_once(PATH::PAGE . "Report_Skillup_Page.php");
                    $page = new Report_Skillup_Page($this->params[1]);
                }
                elseif (strtoupper($this->params[1]) == "RUNE_ENCHANTMENT"){
                    require_once(PATH::PAGE . "Report_Rune_Enchantment_Page.php");
                    $page = new Report_Rune_Enchantment_Page($this->params[1]);
                }
            }
            elseif (strtoupper($this->params[0]) == "OPTIMIZER"){
                if (count($this->params) == 1){
                    require_once(PATH::PAGE . "Optimizer_Page.php");
                    $page = new Optimizer_Page();
                }
                else{
                    require_once(PATH::PAGE . "Optimizer_Unit_Page.php");
                    $page = new Optimizer_Unit_Page($this->params[1]);
                }
            }
        }

        // Load the view, or set an error code.
        if (isset($page)){
            require_once($page->get_view());
            return 200;
        }
        else{
            require_once(PATH::PAGE . "Error_Page.php");
            $page = new Error_Page(404);
            require_once($page->get_view());
            http_response_code(404);
            return 404;
        }
    }
}