/**
 *      Service for tracking currently connected players and remembering what
 *  `APlayer` is connected to what `PlayerController` (`PlayerController`
 *  instance is an `Actor` and therefore should not be stores as `APlayer`'s
 *  variable, since `APlayer` is not an `Actor`).
 *      Copyright 2021 Anton Tarasenko
 *------------------------------------------------------------------------------
 * This file is part of Acedia.
 *
 * Acedia is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3 of the License, or
 * (at your option) any later version.
 *
 * Acedia is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Acedia.  If not, see <https://www.gnu.org/licenses/>.
 */
class PlayerService extends Service;

//  Used to 1-to-1 associate `APlayer` objects with `PlayerController` actors.
struct PlayerControllerPair
{
    var APlayer             player;
    var PlayerController    controller;
};
//  Records of all known pairs
var private array<PlayerControllerPair> allPlayers;

protected function Contructor()
{
    SetTimer(1.0, true);
}

protected function Finalizer()
{
    SetTimer(0.0, false);
}

/**
 *  Creates a new `APlayer` instance for a given `newPlayerController`
 *  controller.
 *
 *  If given controller is `none` or it's `APlayer` was already created,
 *  - does nothing.
 *
 *  @param  newPlayerController Controller for which we must
 *      create new `APlayer`.
 *  @return `true` if new `APlayer` was created and `false` otherwise.
 */
public final function bool RegisterPair(
    PlayerController    newController,
    APlayer             newPlayer)
{
    local int                   i;
    local PlayerControllerPair  newPair;
    if (newController == none)  return false;
    if (newPlayer == none)      return false;

    for (i = 0; i < allPlayers.length; i += 1)
    {
        if (allPlayers[i].controller == newController) {
            return false;
        }
        if (allPlayers[i].player == newPlayer) {
            return false;
        }
    }
    //  Record new pair in service's data
    newPair.controller  = newController;
    newPair.player      = newPlayer;
    allPlayers[allPlayers.length] = newPair;
    return true;
}

/**
 *  Fetches current array of all players (registered `APlayer`s).
 *
 *  @return Current array of all players (registered `APlayer`s). Guaranteed to
 *      not contain `none` values.
 */
public final function array<APlayer> GetAllPlayers()
{
    local int i;
    local array<APlayer> result;
    for (i = 0; i < allPlayers.length; i += 1)
    {
        if (allPlayers[i].controller != none) {
            result[result.length] = allPlayers[i].player;
        }
    }
    return result;
}

/**
 *  Returns `APlayer` associated with a given `PlayerController`.
 *
 *  @param  controller  Controller for which we want to find associated player.
 *  @return `APlayer` that is associated with a given `PlayerController`.
 *      Can return `none` if player has already "expired".
 */
public final function APlayer GetPlayer(Controller controller)
{
    local int i;
    if (controller == none) {
        return none;
    }
    for (i = 0; i < allPlayers.length; i += 1)
    {
        if (controller == allPlayers[i].controller) {
            return allPlayers[i].player;
        }
    }
    return none;
}

/**
 *  Returns `PlayerController` associated with a given `APlayer`.
 *
 *  @param  player  Player for which we want to find associated `Controller`.
 *  @return Controller that is associated with a given player.
 *      Can return `none` if controller has already "expired".
 */
public final function PlayerController GetController(APlayer player)
{
    local int i;
    if (player == none) {
        return none;
    }
    for (i = 0; i < allPlayers.length; i += 1)
    {
        if (player == allPlayers[i].player) {
            return allPlayers[i].controller;
        }
    }
    return none;
}

/**
 *  Returns `Pawn` associated with a given `APlayer`.
 *
 *  @param  player  Player for which we want to find associated `Pawn`.
 *  @return `Pawn` that is associated with a given player.
 *      Can return `none` if controller has already "expired".
 */
public final function Pawn GetPawn(APlayer player)
{
    local Controller controller;
    controller = GetController(player);
    if (controller != none) {
        return controller.pawn;
    }
    return none;
}

/**
 *  IMPORTANT: this is a helper function that is not supposed to be
 *  called manually.
 *
 *  Causes status of all players to update.
 *  See `APlayer.Update()` for details.
 */
event Timer()
{
    local int i;
    while (i < allPlayers.length)
    {
        if (allPlayers[i].controller == none || allPlayers[i].player == none) {
            allPlayers.Remove(i, 1);
        }
        else {
            i += 1;
        }
    }
}

defaultproperties
{
}