-- 处理3D相机的移动控制

require("CSharpConstants")
local Camera3DControllerTool = class("Camera3DControllerTool")

function Camera3DControllerTool:ctor()
	-- 相机的球面坐标系
	-- 半径，离原点的距离，一般是一个正数
	-- 经度，0~2PI，0代表正前方，PI代表正后方
	-- 纬度，HALF_PI代表水平位置，+PI代表底，0代表顶
	self.spherical = cc.vec3(30,1.4,1.4);
	-- 相机旋转中心点
	self.rotationCenter = cc.vec3(0,0,0);
end

function Camera3DControllerTool:moveTo(button , offsetPos)
	-- ALT + 鼠标右键拉近拉远
	if button == MouseButtons.Right then
		--local offset = (offsetPos.x + -offsetPos.y) * 0.1;
		local offset = -offsetPos.x + offsetPos.y;
		self.spherical.x = math.max(self.spherical.x + offset * 0.00075 * self.spherical.x);
		-- 拉得太近了，就把原点丢远一点
		if self.spherical.x <= 1 then
			-- 丢10格
			local fullOut = 30;
			local ray = app.mainCamera:pickRay(0.5,0.5);
			-- 沿着屏幕射线把旋转中心点往前移动
			self.rotationCenter = cc.vec3Add(cc.vec3Mul(ray:getDirection() , fullOut) , self.rotationCenter);
			self.spherical.x = self.spherical.x + fullOut;
		end
		-- ALT + 鼠标中键平移
	elseif button == MouseButtons.Middle then
		local offset = app.mainCamera:moveByViewPlane(cc.vec3(offsetPos.x * 0.00075 * self.spherical.x , -offsetPos.y * 0.00075 * self.spherical.x, 0));
		self.rotationCenter.x = self.rotationCenter.x + offset.x;
		self.rotationCenter.y = self.rotationCenter.y + offset.y;
		self.rotationCenter.z = self.rotationCenter.z + offset.z;
	-- ALT + 鼠标左键旋转
	elseif button == MouseButtons.Left then
		self.spherical.y = self.spherical.y + offsetPos.x * 0.003;
		self.spherical.z = self.spherical.z + offsetPos.y * 0.003;
	end
	self:update();
end

function Camera3DControllerTool:update()
	-- 计算相对rotationCenter的位置
	local pos = Math.SphericalToCartesian(cc.vec3(self.spherical.x , self.spherical.y , self.spherical.z));
	pos.x = pos.x + self.rotationCenter.x
	pos.y = pos.y + self.rotationCenter.y
	pos.z = pos.z + self.rotationCenter.z
	app.mainCamera:getNode():setTranslation(pos);
	app.mainCamera:lookAt(self.rotationCenter);
end


function Camera3DControllerTool:MoveDown(button, x, y)
	-- 按下ALT控制相机
	if app.cs.getModifierKeys() ~= Keys.Alt then return end
		
	-- 鼠标的按下位置
	self.startPos = app.visibleRect:convertScreenToGLView(x, y);
	-- 相机的位置
	self.originPos = app.mainCamera:getNode():getPosition();	
end

function Camera3DControllerTool:MouseMove(button , x , y)
	local glViewPos = app.visibleRect:convertScreenToGLView(x, y);
	if self.startPos then
		local delta = cc.pSub(glViewPos , self.startPos);
		-- 计算结束点
		self:moveTo(button , delta);
		self.startPos = glViewPos;
	end		

	local point = self:convertScreenToWorldPos(x, y);

	local strMapCoord = "";
	if app.editor and app.editor.Map then
		local tilePos = app.editor.Map:getTilePosition(point.x , point.z);
		strMapCoord = string.format(" TilePos:%d,%d" , tilePos.x , tilePos.y);
	end
	local ort = cc.Orientation:new();
	ort:fromQuaternion(app.mainCamera:getNode():getQuaternion());
	local dir = ort:toDirection();

	return string.format("Mouse:%d,%d Coordinate:%.2f,%.2f,%.2f GLView:%d,%d CameraPos:%.2f,%.2f,%.2f CameraDir:%.2f,%.2f,%.2f" .. strMapCoord , x , y , point.x , point.y , point.z , glViewPos.x , glViewPos.y
	 , app.mainCamera:getNode():getTranslationX()
	 , app.mainCamera:getNode():getTranslationY()
	 , app.mainCamera:getNode():getTranslationZ()
	 , dir.x
	 , dir.y
	 , dir.z
	 );
end

function Camera3DControllerTool:MoveUp(button, x, y)
	if not self.startPos then return end
	-- 计算结束点
	--self:moveTo(app.visibleRect:convertScreenToGLView(x, y));
	self.startPos = nil;
	self.originPos = nil;
end

function Camera3DControllerTool:KeyDown(Control , Alt , Shift , KeyCode)
	-- F按下
	if Control == false and Alt == false and Shift == false and KeyCode == Keys.F then
		local node;
		-- 如果有物件被选中，就定位到第一个物件
		if app.editor and app.editor.SelectedNodes and next(app.editor.SelectedNodes) then
			node = next(app.editor.SelectedNodes);
		end
		-- 如果没物件被选中，则定位到当前物件
		if not node and app.editor and app.editor.node then
			node = app.editor.node;
		end

		if node then
			self.rotationCenter = node:getWorldTranslation();
			local box = node:getSelectBox();
			local max = box:getMax();
			local distance = math.max(max.x , max.y , max.z , 1)
			self.spherical = cc.vec3(distance ,1.4,1.4);
		else
			self.rotationCenter = cc.vec3(0,0,0);
			self.spherical = cc.vec3(30,1.4,1.4);
		end
		self:update();

	end
end

-- 摆放物件时使用这个函数计算物件应该放在什么位置
function Camera3DControllerTool:convertScreenToWorldPos(mouseX , mouseY)
	local floorPlane = cc.Plane:new(cc.vec3(0,1,0) , 0);

	-- 计算出mainlayer的世界位置
	local screenSize = cc.Director:getInstance():getWinSizeInPixels();
	local ray = app.mainCamera:pickRay(mouseX / screenSize.width , mouseY / screenSize.height);
	local distance = ray:intersectsPlane(floorPlane);
	if distance >= 0 then
		return ray:getPoint(distance);
	else
		return ray:getPoint(0);
	end
end


-- 刷新设置时调用
function Camera3DControllerTool:refreshSetting()

	app.background:removeAllChildren();

	-- 画手机外壳
	if app.setting.ShowIPhone5 then
		local bgIphone5 = cc.Sprite:create("Editor/iphone5.png");
		app.background:addChild(bgIphone5)
	end
	-- 设置OpenGL背景颜色
	gl.clearColor(app.setting.BackgroundColor.r / 255 , app.setting.BackgroundColor.g / 255 , app.setting.BackgroundColor.b / 255 ,0);

	if app.setting.ShowGrid then
		-- 创建网格

		local vertexFormat = {};
		table.insert(vertexFormat , {size = 3 , usage = cc.VertexFormatUsage.POSITION});
		table.insert(vertexFormat , {size = 4 , usage = cc.VertexFormatUsage.COLOR});
		local vertices = ManualVertices:new(vertexFormat);
		vertices:setColor(app.setting.GridColor);


		local viewSize = cc.size(100,100);
			
		local gridWidth = app.setting.GridSize.width
		local gridHeight = app.setting.GridSize.height
		
		local gridCountY = math.floor(viewSize.height / gridHeight);
		

		vertices:setColor(app.setting.GridColor);
		-- 画横向网格
		for i = -gridCountY , gridCountY do
			if i ~= 0 then
				vertices:drawLine(cc.vec3(-viewSize.width , 0 , i * gridHeight) , cc.vec3(viewSize.width , 0 , i * gridHeight))
			end
		end

		vertices:setColor(app.setting.GridColor);
		-- 画竖向网格
		local gridCountX = math.floor(viewSize.width / gridWidth);
		for i = -gridCountX , gridCountX do
			if i ~= 0 then
				vertices:drawLine(cc.vec3(i * gridWidth , 0 , -viewSize.height) , cc.vec3(i * gridWidth , 0 , viewSize.height))
			end
		end
			
		vertices:setColor(app.setting.AxisColor);
		-- 画轴
		vertices:drawLine(cc.vec3(-viewSize.width , 0 , 0) , cc.vec3(viewSize.width , 0 , 0))
		vertices:drawLine(cc.vec3(0 , 0 , -viewSize.height) , cc.vec3(0 , 0 , viewSize.height))

		local mesh = cc.Mesh:createMesh(vertexFormat , vertices:getVertexCount());
		mesh:setPrimitiveType(cc.PrimitiveType.LINES);
		mesh:setVertexData(vertices:getVertices() , 0 , vertices:getVertexCount());
		mesh:setBoundingBox(vertices:getBoundingBox());

		local model = cc.Model:create(mesh);
		local material = cc.Material:create("core/preload/shaders/ccDefault.material#ShaderPositionColor3D");
		material:setParameterAutoBinding("CC_MVPMatrix" , "WORLD_VIEW_PROJECTION_MATRIX");
		model:setMaterialPointer(material);
		
		local node = cc.Node3D:create();
		node:addComponent(model);
		app.background:addChild(node);
	end
	
end

return Camera3DControllerTool;