-------------------------------------------------------------------------------
-- Spine Runtimes License Agreement
-- Last updated January 1, 2020. Replaces all prior versions.
--
-- Copyright (c) 2013-2020, Esoteric Software LLC
--
-- Integration of the Spine Runtimes into software or otherwise creating
-- derivative works of the Spine Runtimes is permitted under the terms and
-- conditions of Section 2 of the Spine Editor License Agreement:
-- http://esotericsoftware.com/spine-editor-license
--
-- Otherwise, it is permitted to integrate the Spine Runtimes into software
-- or otherwise create derivative works of the Spine Runtimes (collectively,
-- "Products"), provided that each user of the Products must obtain their own
-- Spine Editor license and redistribution of the Products in any form must
-- include this license and copyright notice.
--
-- THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "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 LLC 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
-- THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-------------------------------------------------------------------------------

local setmetatable = setmetatable
local AttachmentType = require "spine-lua.attachments.AttachmentType"
local VertexAttachment = require "spine-lua.attachments.VertexAttachment"
local utils = require "spine-lua.utils"
local Color = require "spine-lua.Color"

local MeshAttachment = {}
MeshAttachment.__index = MeshAttachment
setmetatable(MeshAttachment, { __index = VertexAttachment })

function MeshAttachment.new (name)
	if not name then error("name cannot be nil", 2) end

	local self = VertexAttachment.new(name, AttachmentType.mesh)
	self.region = nil
	self.path = nil
	self.regionUVs = nil
	self.uvs = nil
	self.triangles = nil
	self.color = Color.newWith(1, 1, 1, 1)
	self.hullLength = 0
	self.parentMesh = nil
	self.tempColor = Color.newWith(1, 1, 1, 1)
	self.width = 0
	self.height = 0
	setmetatable(self, MeshAttachment)
	return self
end

function MeshAttachment:updateUVs ()
	local u = 0
	local v = 0
	local width = 0
	local height = 0

	local regionUVs = self.regionUVs
	if not self.uvs or (#self.uvs ~= #regionUVs) then self.uvs = utils.newNumberArray(#regionUVs) end
	local uvs = self.uvs

	if not self.region then
		u = 0
		v = 0
		width = 1
		height = 1
	else
		local region = self.region
		local textureWidth = region.page.width
		local textureHeight = region.page.height

		if region.degrees == 90 then
			u = region.u - (region.originalHeight - region.offsetY - region.height) / textureWidth
			v = region.v - (region.originalWidth - region.offsetX - region.width) / textureHeight
			width = region.originalHeight / textureWidth
			height = region.originalWidth / textureHeight
			local i = 0
			local n = #uvs
			while i < n do
				uvs[i + 1] = u + regionUVs[i + 2] * width;
				uvs[i + 2] = v + (1 - regionUVs[i + 1]) * height;
				i = i + 2
			end
		elseif region.degrees == 180 then
			u = region.u - (region.originalWidth - region.offsetX - region.width) / textureWidth
			v = region.v - region.offsetY / textureHeight
			width = region.originalWidth / textureWidth
			height = region.originalHeight / textureHeight
			local i = 0
			local n = #uvs
			while i < n do
				uvs[i + 1] = u + (1 - regionUVs[i + 1]) * width;
				uvs[i + 2] = v + (1 - regionUVs[i + 2]) * height;
				i = i + 2
			end
		elseif region.degrees == 270 then
			u = region.u - region.offsetY / textureWidth
			v = region.v - region.offsetX / textureHeight
			width = region.originalHeight / textureWidth
			height = region.originalWidth / textureHeight
			local i = 0
			local n = #uvs
			while i < n do
				uvs[i + 1] = u + (1 - regionUVs[i + 2]) * width;
				uvs[i + 2] = v + regionUVs[i + 1] * height;
				i = i + 2
			end
		else
			u = region.u - region.offsetX / textureWidth;
			v = region.v - (region.originalHeight - region.offsetY - region.height) / textureHeight;
			width = region.originalWidth / textureWidth;
			height = region.originalHeight / textureHeight;
			local i = 0
			local n = #uvs
			while i < n do
				uvs[i + 1] = u + regionUVs[i + 1] * width;
				uvs[i + 2] = v + regionUVs[i + 2] * height;
				i = i + 2
			end
		end
	end
end

function MeshAttachment:setParentMesh (parentMesh)
	self.parentMesh = parentMesh
	if parentMesh then
		self.bones = parentMesh.bones
		self.vertices = parentMesh.vertices
		self.worldVerticesLength = parentMesh.worldVerticesLength
		self.regionUVs = parentMesh.regionUVs
		self.triangles = parentMesh.triangles
		self.hullLength = parentMesh.hullLength
	end
end

function MeshAttachment:copy ()
	if self.parentMesh then return self:newLinkedMesh() end

	local copy = MeshAttachment.new(self.name)
	copy.region = self.region
	copy.path = self.path
	copy.color:setFrom(self.color)

	self:copyTo(copy)
	copy.regionUVs = utils.copy(self.regionUVs)
	copy.uvs = utils.copy(self.uvs)
	copy.triangles = utils.copy(self.triangles)
	copy.hullLength = self.hullLength
	if self.edges then
		copy.edges = utils.copy(edges)
	end
	copy.width = self.width
	copy.height = self.height

	return copy
end

function MeshAttachment:newLinkedMesh ()
	local copy = MeshAttachment.new(self.name)
	copy.region = self.region
	copy.path = self.path
	copy.color:setFrom(self.color)
	if self.parentMesh then
		copy.deformAttachment = self.parentMesh
	else
		copy.deformAttachment = self
	end
	copy:setParentMesh(self.parentMesh)
	copy:updateUVs()
	return copy
end

return MeshAttachment