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const aClientSystem = client.registerSystem(0, 0);
 
// Global variables
let globalVars = {};
 
// A query to control fighters that need to be animated
globalVars.animationQuery = {};
 
// Setup which events to listen for
aClientSystem.initialize = function () {
    this.listenForEvent("minecraft:pick_hit_result_changed", (eventData) => this.onPick(eventData));
 
    // Setup callback for when the player enters the world
    this.listenForEvent("minecraft:client_entered_world", (eventData) => this.onClientEnteredWorld(eventData));
 
    // Setup callback for UI events from the custom screens
    this.listenForEvent("minecraft:ui_event", (eventData) => this.onUIMessage(eventData));
 
    // Setup callback for the victory event from the server script
    this.listenForEvent("rpg_game:victory", (eventData) => this.onVictory(eventData));
 
    // Setup callback for the loss event from the server script
    this.listenForEvent("rpg_game:loss", (eventData) => this.onLoss(eventData));
 
    // Setup callback for the turn order event from the server script
    this.listenForEvent("rpg_game:update_turn_order", (eventData) => this.onUpdateTurnOrder(eventData));
 
    // Setup callback to handle the on-hit animation from the server script
    this.listenForEvent("rpg_game:execute_on_hit_animation", (eventData) => this.onExecuteOnHitAnimation(eventData));   
 
    // Register a script only component to help control animations
    this.registerComponent("rpg_game:animation_controller", { counter: 0 });
 
    // Register a query to get all fighters that have the custom component that helps control animations
    globalVars.animationQuery = this.registerQuery();
    this.addFilterToQuery(globalVars.animationQuery, "rpg_game:animation_controller");
 
};
 
aClientSystem.update = function () {
    // Update all animating fighters
    this.UpdateAnimationState();
};
 
aClientSystem.onPick = function (eventData) {
    // Relay pick event to the server script to update the newest hovered target
    this.broadcastEvent("rpg_game:update_hovered_target", eventData);
};
 
aClientSystem.onUpdateTurnOrder = function (turnOrderData) {
    // Package up the turn order data to send to the custom screen for display.
    // The data property requires a string. Turn an object into a string by using JSON.stringify()
    let uiEventData = {
        eventName: "UpdateTurnOrder",
        data: JSON.stringify(turnOrderData)
    };
 
    // Send the event to the custom screen
    this.broadcastEvent("minecraft:send_ui_event", uiEventData);
};
 
aClientSystem.onClientEnteredWorld = function (eventData) {
    // Client has entered the world, show the starting screen
    aClientSystem.broadcastEvent("minecraft:load_ui", {path:"rpg_game_start.html"});
    // Notify the server script that the player has finished loading in.
    aClientSystem.broadcastEvent("rpg_game:client_entered_world", eventData);
};
 
aClientSystem.onVictory = function (eventData) {
    // Server told us that the player won, remove the game screen and show the victory screen
    this.broadcastEvent("minecraft:unload_ui", {path:"rpg_game.html"});
    this.broadcastEvent("minecraft:load_ui", {path:"rpg_game_victory.html"});
};
 
aClientSystem.onLoss = function (eventData) {
    // Server told us that the player lost, remove the game screen and show the loss screen
    this.broadcastEvent("minecraft:unload_ui", {path:"rpg_game.html"});
    this.broadcastEvent("minecraft:load_ui", {path:"rpg_game_loss.html"});
};
 
aClientSystem.onUIMessage = function (eventData) {
    // UI engine sent us an event.
    if (eventData === "damageSingleTargetAbilityClicked" ||
        eventData === "damageWholeTeamAbilityClicked" ||
        eventData === "healSingleTargetAbilityClicked") {
        // An ability button was clicked. Send an ability clicked event to the server script
        this.broadcastEvent("rpg_game:ability_clicked", eventData);
    }
    else if (eventData === "rpg_game:click") {
        this.broadcastEvent("rpg_game:click", "");
    }
    else if (eventData === "startPressed" || eventData === "restartPressed") {
        // Start or restart button was pressed on a screen. Start up the game.
        this.startGame();
    }
    else if (eventData === "leavePressed") {
        // Leave button was pressed. Exit all custom screens and stop turn-based game.
        this.leaveGame();
    }
};
 
aClientSystem.startGame = function () {
    // Remove any screens we might have loaded
    this.broadcastEvent("minecraft:unload_ui", {path:"rpg_game_start.html"});
    this.broadcastEvent("minecraft:unload_ui", {path:"rpg_game.html"});
    this.broadcastEvent("minecraft:unload_ui", {path:"rpg_game_loss.html"});
    this.broadcastEvent("minecraft:unload_ui", {path:"rpg_game_victory.html"});
 
    // Load and show the game screen
    this.broadcastEvent("minecraft:load_ui", {path:"rpg_game.html"});
    // Tell the server to start the game
    this.broadcastEvent("rpg_game:start", "");
};
 
aClientSystem.leaveGame = function () {
    // Remove any screens we might have loaded
    this.broadcastEvent("minecraft:unload_ui", {path:"rpg_game_start.html"});
    this.broadcastEvent("minecraft:unload_ui", {path:"rpg_game.html"});
    this.broadcastEvent("minecraft:unload_ui", {path:"rpg_game_loss.html"});
    this.broadcastEvent("minecraft:unload_ui", {path:"rpg_game_victory.html"});
    
    // Tell the server to leave the game
    this.broadcastEvent("rpg_game:leave", "");
};
 
aClientSystem.onExecuteOnHitAnimation = function(fighter) {
    // Add a animation controller component to the fighter that was just hit
    // Used to track animation counters
    this.createComponent(fighter, "rpg_game:animation_controller");
};
 
aClientSystem.UpdateAnimationState = function () {
    // Get all currently animating fighters
    let animatedFighters = this.getEntitiesFromQuery(globalVars.animationQuery);
 
    // Update animation 
    for (let index in animatedFighters) {
        let fighter = animatedFighters[index];
        let molangComponent = this.getComponent(fighter, "minecraft:molang");
        // Get the animation controller component that was added when the fighter was hit
        let animationComponent = this.getComponent(fighter, "rpg_game:animation_controller");
        if (animationComponent.data.counter < 1) {
            // Increment counter and base the fighters animation on it
            animationComponent.data.counter += 0.03;
            molangComponent.data["variable.script_attacktime"] = animationComponent.data.counter;
            this.applyComponentChanges(fighter, animationComponent);
        }
        else {
            // Animation has finished. Reset the molang component. Remove the animation controller component from the fighter.
            molangComponent.data["variable.script_attacktime"] = 0;
            this.destroyComponent(fighter, "rpg_game:animation_controller");
        }
        this.applyComponentChanges(fighter, molangComponent);
    }
};