//
//  zombieAttackerScript.js
//
//  Created by David Back on 2/8/18.
//  Copyright 2018 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html

var getAvatarsInRange = true;

var CHANNEL_NAME = "ZOMBIE_BITE";
var SEARCH_RANGE = 3;
var BITE_RANGE = 0.3;
var BITE_SOUND = SoundCache.getSound("atp:/zombieBite.wav");
var BITE_SOUND_VOLUME = 0.5;
var BLOOD_COLOR = { "blue": 7, "green": 7, "red": 138 };
var BLOOD_PARTICLE_TEXTURE = "atp:/rain.png";
var BLOOD_HEAD_DIFFERENCE_MULTIPLE = 0.8;
var BLOOD_Z_OFFSET = 0.15;
var TRIGGER_CONTROLS = [Controller.Standard.LT, Controller.Standard.RT];
var TRIGGER_THRESHOLD = 0.9;
var BITE_ANIMATION = "atp:/zombieBite.fbx";
var BITE_ANIMATION_START_FRAME = 0;
var BITE_ANIMATION_BLOOD_KEYFRAME = 10;
var BITE_ANIMATION_END_FRAME = 160;
var BITE_ANIMATION_FPS = 60;
var MSEC_PER_SEC = 1000;
var DEBUG_BITE_KEY = "f";
var DEBUG_PRINT = true;

var bloodTargetAvatar;
var biteAnimationPlaying = false;
var bloodEffect;

function triggerBite() {
    if (biteAnimationPlaying) {
        if (DEBUG_PRINT) {
            print("triggerBite blocked due to bite animation playing");
        }
        return;
    }

    var myHeadPosition = MyAvatar.getJointPosition("Head");
	var avatarList;
	if (getAvatarsInRange) {
		avatarList = AvatarList.getAvatarsInRange(myHeadPosition, SEARCH_RANGE);
	} else {
		avatarList = AvatarList.getAvatarIdentifiers();
    }
    
	avatarList.forEach(function(targetAvatarSessionUUID) {
		if (targetAvatarSessionUUID != null && targetAvatarSessionUUID != MyAvatar.sessionUUID) {
            var targetAvatar = AvatarList.getAvatar(targetAvatarSessionUUID);
			var targetHeadPosition = targetAvatar.getJointPosition("Head");
			if (Vec3.distance(myHeadPosition, targetHeadPosition) < BITE_RANGE) {
                bloodTargetAvatar = targetAvatarSessionUUID;
				if (DEBUG_PRINT) {
					print("Biting avatar " + targetAvatarSessionUUID + " from " + MyAvatar.sessionUUID);
                }
                Messages.sendMessage(CHANNEL_NAME, JSON.stringify({type: 'receiveBite', biterID: MyAvatar.sessionUUID, 
                                                                                        victimID: targetAvatarSessionUUID}));
                MyAvatar.overrideAnimation(BITE_ANIMATION, BITE_ANIMATION_FPS, false, 
                                           BITE_ANIMATION_START_FRAME, BITE_ANIMATION_END_FRAME);
                biteAnimationPlaying = true;

                var timeOut = MSEC_PER_SEC * BITE_ANIMATION_END_FRAME / BITE_ANIMATION_FPS;
                Script.setTimeout(function () {
                    biteAnimationPlaying = false;
                    MyAvatar.restoreAnimation();
                }, timeOut);

                var bloodTimeOut = MSEC_PER_SEC * BITE_ANIMATION_BLOOD_KEYFRAME / BITE_ANIMATION_FPS;
                Script.setTimeout(function () {
                    var targetAvatar = AvatarList.getAvatar(bloodTargetAvatar);
                    var targetHeadPosition = targetAvatar.getJointPosition("Head");
                    var headDifference = Vec3.length(Vec3.subtract(targetHeadPosition, targetAvatar.position));
                    var localPosition = { x:0, y:headDifference * BLOOD_HEAD_DIFFERENCE_MULTIPLE, z:BLOOD_Z_OFFSET };
                    bloodEffect = {
                        "alpha": 1,
                        "alphaFinish": 0,
                        "alphaSpread": 1,
                        "alphaStart": 1,
                        "color": BLOOD_COLOR,
                        "colorFinish": BLOOD_COLOR,
                        "colorSpread": BLOOD_COLOR,
                        "colorStart": BLOOD_COLOR,
                        "dimensions": {
                            "x": 0.5,
                            "y": 0.5,
                            "z": 0.5
                        },
                        "emitAcceleration": {
                            "x": 0,
                            "y": -2,
                            "z": 0
                        },
                        "emitDimensions": {
                            "x": 1,
                            "y": 0.2,
                            "z": 1
                        },
                        "emitRate": 7.5,
                        "emitterShouldTrail": true,
                        "emitSpeed": 0.15,
                        "lifespan": 1,
                        "lifetime": 1,
                        "locked": true,
                        "localPosition": localPosition,
                        "particleRadius": 0.2,
                        "parentID": targetAvatarSessionUUID,
                        "polarFinish": 0.6981316804885864,
                        "radiusFinish": 0.2,
                        "radiusStart": 0,
                        "speedSpread": 0.3,
                        "textures": BLOOD_PARTICLE_TEXTURE,
                        "type": "ParticleEffect"
                    };
                    Entities.addEntity(bloodEffect);
                    Audio.playSound(BITE_SOUND, {
                        volume: BITE_SOUND_VOLUME,
                        position: targetHeadPosition
                    });
                }, bloodTimeOut);
				return;
			}
		}
	});
}

function keyPressEvent(event) {
    if (DEBUG_BITE_KEY == event.text) {
        if (DEBUG_PRINT) {
            print("triggerBite called from debug key press");
        }
        triggerBite();
    }
}

function update() {
    for (var i = 0; i < TRIGGER_CONTROLS.length; i++) {
        var triggerValue = Controller.getValue(TRIGGER_CONTROLS[i]);
        if (triggerValue >= TRIGGER_THRESHOLD) {
            if (DEBUG_PRINT) {
                print("triggerBite called from controller trigger");
            }
            triggerBite();
        }
    }
}

function shutdown() {
    Controller.keyPressEvent.disconnect(keyPressEvent);
}

function init() {
	Script.scriptEnding.connect(shutdown);
    Script.update.connect(update);
    Controller.keyPressEvent.connect(keyPressEvent);
}

init();