<?php
    /**
     * Unit api.
     *
     * Exposes an API to get a list of units of a player, or a unit details.
     * Used POST parameters are:
     *  - key: User API key. If not, only public user's unit can be seen.
     *
     * @category API
     * @magic $params URL parameters:
     *  1: User ID
     *  2: Unit ID (optional)
     */

    global $db;

    try{

        if (count($params) <= 1){
            http_response_code(400);
            return 400;
        }
        $uid = $params[1];
        $id = null;

        if (count($params) > 2){
            $id = $params[2];
        }

        // Check API key or public profile.
        if (isset($_POST['key'])){
            $key = filter_input(INPUT_POST, 'key');
        }
        else{
            $key = "";
        }
        $s = "SELECT COUNT(uid) AS c FROM player WHERE uid = $uid AND (public = 1 OR api_key = '$key');";
        if (1 != $db->query($s)->fetchArray(SQLITE3_ASSOC)["c"]){
            http_response_code(401);
            return 401;
        }

        // No unit ID specified, show a list.
        if ($id == null){
            $units = [];
            $s = "SELECT id, '" . URL::BASE . "API/v2/units/$uid/' || id AS uri FROM unit WHERE uid = '$uid'";
            $q = $db->query($s);
            $content = false;
            while ($r = $q->fetchArray(SQLITE3_ASSOC)){
                array_push($units, $r);
                $content = true;
            }
            if ($content == true){
                header('Content-Type: application/json');
                echo json_encode($units);
                http_response_code(200);
                return 200;
            }
            else{
                http_response_code(204);
                return 204;
            }
        }

        // Specific unit, show details.
        else{
            $s = "SELECT * FROM unit WHERE uid = '$uid' AND id = '$id'";
            $q = $db->query($s);
            if($r = $q->fetchArray(SQLITE3_ASSOC)){
                $unit = $r;

                // Runes
                $unit["runes"] = [];
                $s = "SELECT * FROM rune WHERE assigned_to = '" . $unit["id"] . "' ORDER BY slot;";
                $q = $db->query($s);
                while ($r = $q->fetchArray(SQLITE3_ASSOC)){
                    $rune = $r;
                    unset($rune["uid"]); # Not needed
                    unset($rune["assigned_to"]); # Not needed
                    array_push($unit["runes"], $rune);
                }

                // Skills
                $unit["skills"] = [];
                $s = "SELECT skill, level FROM unit_skill WHERE unit = '" . $unit["id"] . "';";
                $q = $db->query($s);
                while ($r = $q->fetchArray(SQLITE3_ASSOC)){
                    array_push($unit["skills"], $r);
                }

                header('Content-Type: application/json');
                echo json_encode($unit);
                http_response_code(200);
                return 200;
            }
            else{
                http_response_code(404);
                return 404;
            }
        }

    }
    catch(Exception $e) {
        error_log("Unknown error fetching units: " . $e->getMessage());
        http_response_code(500);
        return 500;
    }
?>