-------------------------------------------------------------------------------
-- Spine Runtimes Software License v2.5
--
-- Copyright (c) 2013-2016, Esoteric Software
-- All rights reserved.
--
-- You are granted a perpetual, non-exclusive, non-sublicensable, and
-- non-transferable license to use, install, execute, and perform the Spine
-- Runtimes software and derivative works solely for personal or internal
-- use. Without the written permission of Esoteric Software (see Section 2 of
-- the Spine Software License Agreement), you may not (a) modify, translate,
-- adapt, or develop new applications using the Spine Runtimes or otherwise
-- create derivative works or improvements of the Spine Runtimes or (b) remove,
-- delete, alter, or obscure any trademarks or any copyright, trademark, patent,
-- or other intellectual property or proprietary rights notices on or in the
-- Software, including any copy thereof. Redistributions in binary or source
-- form must include this license and terms.
--
-- THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
-- IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
-- EVENT SHALL ESOTERIC SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS INTERRUPTION, OR LOSS OF
-- USE, DATA, OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
-- IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
-------------------------------------------------------------------------------

local spine = require "spine-love.spine"

local skeletons = {}
local activeSkeleton = 1
local swirl = spine.SwirlEffect.new(400)
local swirlTime = 0

function loadSkeleton (jsonFile, atlasFile, animation, skin, scale, x, y)
	local loader = function (path) return love.graphics.newImage("data/" .. path) end
	local atlas = spine.TextureAtlas.new(spine.utils.readFile("data/" .. atlasFile .. ".atlas"), loader)

	local json = spine.SkeletonJson.new(spine.AtlasAttachmentLoader.new(atlas))
	json.scale = scale
	local skeletonData = json:readSkeletonDataFile("data/" .. jsonFile .. ".json")
	local skeleton = spine.Skeleton.new(skeletonData)
	skeleton.x = x
	skeleton.y = y
	skeleton.scaleY = -1
	if skin then
		skeleton:setSkin(skin)
	end
	skeleton:setToSetupPose()
	
	local stateData = spine.AnimationStateData.new(skeletonData)
	local state = spine.AnimationState.new(stateData)
	state:setAnimationByName(0, animation, true)
	if (jsonFile == "spineboy-ess") then
		stateData:setMix("walk", "jump", 0.5)
		stateData:setMix("jump", "run", 0.5)
		state:addAnimationByName(0, "jump", false, 3)
		state:addAnimationByName(0, "run", true, 0)
	end
	
	if (jsonFile == "raptor-pro") then
		swirl.centerY = -200
		skeleton.vertexEffect = swirl
		-- skeleton.vertexEffect = spine.JitterEffect.new(10, 10)
	end
	
	-- set some event callbacks
	state.onStart = function (entry)
		print(entry.trackIndex.." start: "..entry.animation.name)
	end
	state.onInterrupt = function (entry)
		print(entry.trackIndex.." interrupt: "..entry.animation.name)
	end
	state.onEnd = function (entry)
		print(entry.trackIndex.." end: "..entry.animation.name)
	end
	state.onComplete = function (entry)
		print(entry.trackIndex.." complete: "..entry.animation.name)
	end
	state.onDispose = function (entry)
		print(entry.trackIndex.." dispose: "..entry.animation.name)
	end
	state.onEvent = function (entry, event)
		print(entry.trackIndex.." event: "..entry.animation.name..", "..event.data.name..", "..event.intValue..", "..event.floatValue..", '"..(event.stringValue or "").."'" .. ", " .. event.volume .. ", " .. event.balance)
	end
	
	state:update(0.5)
	state:apply(skeleton)
	
	return { state = state, skeleton = skeleton }
end

function love.load(arg)
	if arg[#arg] == "-debug" then require("mobdebug").start() end
	skeletonRenderer = spine.SkeletonRenderer.new(true)
	table.insert(skeletons, loadSkeleton("spineboy-pro", "spineboy", "walk", nil, 0.5, 400, 500))
	table.insert(skeletons, loadSkeleton("stretchyman-pro", "stretchyman", "sneak", nil, 0.3, 200, 500))
	table.insert(skeletons, loadSkeleton("coin-pro", "coin", "animation", nil, 0.5, 400, 300))
	table.insert(skeletons, loadSkeleton("raptor-pro", "raptor", "walk", nil, 0.3, 400, 500))
	table.insert(skeletons, loadSkeleton("goblins-pro", "goblins", "walk", "goblin", 1, 400, 500))
	table.insert(skeletons, loadSkeleton("tank-pro", "tank", "drive", nil, 0.2, 600, 500))
	table.insert(skeletons, loadSkeleton("vine-pro", "vine", "grow", nil, 0.3, 400, 500))
	table.insert(skeletons, loadSkeleton("stretchyman-stretchy-ik-pro", "stretchyman", "sneak", nil, 0.3, 200, 500))
end

function love.update (delta)
	-- Update the state with the delta time, apply it, and update the world transforms.
	local state = skeletons[activeSkeleton].state
	local skeleton = skeletons[activeSkeleton].skeleton
	state:update(delta)
	state:apply(skeleton)
	skeleton:updateWorldTransform()
	
	if (skeleton.vertexEffect) then
		skeletonRenderer.vertexEffect = skeleton.vertexEffect
		if (skeleton.vertexEffect == swirl) then
			swirlTime = swirlTime + delta
			local percent = swirlTime % 2
			if (percent > 1) then percent = 1 - (percent - 1) end
			swirl.angle = spine.Interpolation.apply(spine.Interpolation.pow2, -60, 60, percent)
		end
	else
		skeletonRenderer.vertexEffect = nil
	end
end

function love.draw ()
	love.graphics.setBackgroundColor(0, 0, 0, 255)
	love.graphics.setColor(255, 255, 255)
	local skeleton = skeletons[activeSkeleton].skeleton
	
	skeletonRenderer:draw(skeleton)
end

function love.mousepressed (x, y, button, istouch)
	activeSkeleton = activeSkeleton + 1
	if activeSkeleton > #skeletons then activeSkeleton = 1 end
end