local rotation
local texture

local ffi = require 'ffi'
local _math = require '_math'
local mat4 = _math.mat4
local vec3 = _math.vec3
local vec4 = _math.vec4
local scalar = _math.scalar
local scene_test = require 'scene.test.test'
local collada_scene = require 'collada_scene'

local vertexformat = {
   { name = 'VertexPosition', format = 'floatvec3', location = 0 },
   { name = 'VertexNormal', format = 'floatvec3', location = 1 },
   { name = 'VertexTexture', format = 'floatvec3', location = 2 },
}

function pnt_attribute_list(vertex_buffer, offset)
   return {
      {
         buffer = vertex_buffer,
         location = 0,
         name = "VertexPosition",
         nameinbuffer = nil,
         step = "pervertex",
         startindex = 1 + offset,
      },
      {
         buffer = vertex_buffer,
         location = 1,
         name = "VertexNormal",
         nameinbuffer = nil,
         step = "pervertex",
         startindex = 1 + offset,
      },
      {
         buffer = vertex_buffer,
         location = 2,
         name = "VertexTexture",
         nameinbuffer = nil,
         step = "pervertex",
         startindex = 1 + offset,
      },
   }
end

function love.load(args)
   love.window.setMode(1024, 1024, {depth=true})

   local vertex_data = love.filesystem.newFileData("scene/test/test.vtx")
   local index_data = love.filesystem.newFileData("scene/test/test.idx")

   local vertex_buffer = love.graphics.newBuffer(vertexformat, vertex_data, { vertex = true, usage = "static" })
   local index_buffer = love.graphics.newBuffer("uint32", index_data, { index = true, usage = "static" })

   load_geometries(vertex_buffer, index_buffer, scene_test.descriptor.geometries)
   load_node_world_transforms(scene_test.descriptor.nodes)

   local image_data = love.image.newCompressedData('bird.dds')
   texture = love.graphics.newTexture(image_data)
end

local rotation = 0.0

function love.draw()
   local radius = 100
   local mx, my = love.mouse.getPosition()

   width, height = love.graphics.getDimensions()

   -- local projection = mat4.perspective_rh(width / width * 0.1,
   --                                        height / width * 0.1,
   --                                        0.1,
   --                                        1000.0)
   local aspect_ratio = width / height
   local projection = mat4.perspective_fov_rh(scalar.convert_to_radians(45 / 2),
                                              aspect_ratio,
                                              0.1,
                                              1000.0)

   local view = mat4.look_at_rh(vec3(-88.57101, -71.71298, 104.5738),
                                vec3(-19.90239, -27.72767, 54.6898),
                                vec3(0, 0, 1))

   local world1 = mat4.rotation_x(rotation)
   local world2 = mat4.rotation_z(rotation * 0.5)
   --local world3 = mat4.translation(0, 0, -0.5)

   local transform = view * projection

   love.graphics.setDepthMode("less", true)
   draw_nodes(scene_test.descriptor.nodes, transform)
end