source: ps/trunk/binaries/data/mods/public/maps/scenarios/treasure_islands.js

Trigger.prototype.IntroductionMessage = function(data)
{
    if (this.state != "start")
        return;

    var cmpGUIInterface = Engine.QueryInterface(SYSTEM_ENTITY, IID_GuiInterface);
    cmpGUIInterface.PushNotification({
        "players": [1,2],
        "message": markForTranslation("Collect the treasures before your enemy does! May the better win!"),
        translateMessage: true
    });
};

Trigger.prototype.TreasureCollected = function(data)
{
    var cmpGUIInterface = Engine.QueryInterface(SYSTEM_ENTITY, IID_GuiInterface);

    var count = ++this.treasureCount.players[data.player];
    var goalCount = this.treasureCount.maximum / 2 + 1;
    var otherPlayer = (data.player == 1 ? 2 : 1);

    // Check if having more treasures than the enemy is still possible
    if ( (count == this.treasureCount.maximum / 2) &&
        (this.treasureCount.players[otherPlayer] == this.treasureCount.maximum / 2) )
    {
        cmpGUIInterface.PushNotification({
            "players": [1,2],
            "message": markForTranslation("No winner yet, prepare for battle!"),
            "translateMessage": true
        });

        // keep notifying the player that the victory condition has changed.
        this.RegisterTrigger("OnInterval", "BattleMessage", {
            "enabled": true,
            "delay": 10000,
            "interval": 12000
        });
    }
    else if (count >= goalCount) // Check for victory
    {
        cmpGUIInterface.PushNotification({
            "players": [otherPlayer],
            "message": markForTranslation("Your enemy's treasury is filled to the brim, you lose!"),
            "translateMessage": true
        });
        cmpGUIInterface.PushNotification({
            "players": [data.player],
            "message": markForTranslation("Your treasury is filled to the brim, you are victorious!"),
            "translateMessage": true
        });
        this.DoAfterDelay(5000, "Victory", data.player);
    }
    else
    {
        // Notify if the other player if a player is close to victory (3 more treasures to collect)
        if (count + 3 == goalCount)
        {
            cmpGUIInterface.PushNotification({
                "players": [otherPlayer],
                "message": markForTranslation("Hurry up! Your enemy is close to victory!"),
                "translateMessage": true
            });
        }

        if (count + 3 >= goalCount)
        {
            var remainingTreasures = ( goalCount - count);
            cmpGUIInterface.PushNotification({
                "players": [data.player],
                "parameters": {"remainingTreasures": remainingTreasures},
                "message": markForTranslation("Treasures remaining to collect for victory:  %(remainingTreasures)s!"),
                "translateMessage": true
            });
        }
        else
        {
            cmpGUIInterface.PushNotification({
                "players": [data.player],
                "message": markForTranslation("You have collected a treasure!"),
                "translateMessage": true
            });
        }
    }
};

Trigger.prototype.BattleMessage = function()
{
    var cmpGUIInterface = Engine.QueryInterface(SYSTEM_ENTITY, IID_GuiInterface);
    cmpGUIInterface.PushNotification({
        "players": [1,2],
        "message": markForTranslation("Defeat your enemy to win!"),
        "translateMessage": true
    });
};

Trigger.prototype.Victory = function(playerID)
{
    TriggerHelper.SetPlayerWon(
        playerID,
        n => markForPluralTranslation(
            "%(lastPlayer)s has won (treasure collected).",
            "%(players)s and %(lastPlayer)s have won (treasure collected).",
            n),
        n => markForPluralTranslation(
            "%(lastPlayer)s has been defeated (treasure collected).",
            "%(players)s and %(lastPlayer)s have been defeated (treasure collected).",
            n));
};

var cmpTrigger = Engine.QueryInterface(SYSTEM_ENTITY, IID_Trigger);

// TODO: It would be nice to get the total number of treasure on the map automatically somehow
cmpTrigger.treasureCount = { "players": { "1":0,"2":0 }, "maximum": 36 };
cmpTrigger.state = "start";
cmpTrigger.DoAfterDelay(2000, "IntroductionMessage", {});
cmpTrigger.RegisterTrigger("OnTreasureCollected", "TreasureCollected", { "enabled": true });