#include <cstdint>

#include "align.hpp"

#include "vga.hpp"
#include "holly.hpp"
#include "holly/core.hpp"
#include "holly/core_bits.hpp"
#include "holly/ta_fifo_polygon_converter.hpp"
#include "holly/ta_parameter.hpp"
#include "holly/ta_bits.hpp"
#include "holly/region_array.hpp"
#include "holly/background.hpp"
#include "holly/texture_memory_alloc.hpp"
#include "memorymap.hpp"

#include "serial.hpp"

#include "macaw.hpp"

struct vertex {
  float x;
  float y;
  float z;
  float u;
  float v;
};

vertex cube_faces[][4] = {
  { // front
    { -1.0f, -1.0f,  1.0f, 0.f, 0.f},
    { -1.0f,  1.0f,  1.0f, 0.f, 1.f},
    {  1.0f, -1.0f,  1.0f, 1.f, 0.f},
    {  1.0f,  1.0f,  1.0f, 1.f, 1.f},
  },
  { // back
    { -1.0f, -1.0f, -1.0f, 1.f, 0.f},
    { -1.0f,  1.0f, -1.0f, 1.f, 1.f},
    {  1.0f, -1.0f, -1.0f, 0.f, 0.f},
    {  1.0f,  1.0f, -1.0f, 0.f, 1.f},
  },
  { // right side
    {  1.0f, -1.0f,  1.0f, 0.f, 0.f},
    {  1.0f,  1.0f,  1.0f, 0.f, 1.f},
    {  1.0f, -1.0f, -1.0f, 1.f, 0.f},
    {  1.0f,  1.0f, -1.0f, 1.f, 1.f},
  },
  { // left side
    {  -1.0f, -1.0f,  1.0f, 1.f, 0.f},
    {  -1.0f,  1.0f,  1.0f, 1.f, 1.f},
    {  -1.0f, -1.0f, -1.0f, 0.f, 0.f},
    {  -1.0f,  1.0f, -1.0f, 0.f, 1.f},
  },
};
constexpr uint32_t num_faces = (sizeof (cube_faces)) / (sizeof (cube_faces[0]));

constexpr uint32_t color = 0xffff00ff;

static float theta = 0;
constexpr float half_degree = 0.01745329f / 2.f;

void transform(ta_parameter_writer& parameter,
	       const vertex * strip_vertices,
	       const uint32_t strip_length,
	       const uint32_t screen_width,
	       const uint32_t screen_height,
	       const uint32_t texture_address,
	       const uint32_t texture_width)
{
  auto polygon = global_polygon_type_0(texture_address);
  switch (texture_width) {
  case 32:
    polygon.tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
				 | tsp_instruction_word::dst_alpha_instr::zero
				 | tsp_instruction_word::fog_control::no_fog
				 | tsp_instruction_word::texture_u_size::_32
				 | tsp_instruction_word::texture_v_size::_32
    				 | tsp_instruction_word::use_alpha;
    break;
  case 64:
    polygon.tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
				 | tsp_instruction_word::dst_alpha_instr::zero
				 | tsp_instruction_word::fog_control::no_fog
				 | tsp_instruction_word::texture_u_size::_64
				 | tsp_instruction_word::texture_v_size::_64
    				 | tsp_instruction_word::use_alpha;
    break;
  case 128:
    polygon.tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
				 | tsp_instruction_word::dst_alpha_instr::zero
				 | tsp_instruction_word::fog_control::no_fog
				 | tsp_instruction_word::texture_u_size::_128
				 | tsp_instruction_word::texture_v_size::_128
    				 | tsp_instruction_word::use_alpha;
    break;
  case 256:
    polygon.tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
				 | tsp_instruction_word::dst_alpha_instr::zero
				 | tsp_instruction_word::fog_control::no_fog
				 | tsp_instruction_word::texture_u_size::_256
				 | tsp_instruction_word::texture_v_size::_256
    				 | tsp_instruction_word::use_alpha;
    break;
  case 512:
    polygon.tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
				 | tsp_instruction_word::dst_alpha_instr::zero
				 | tsp_instruction_word::fog_control::no_fog
				 | tsp_instruction_word::texture_u_size::_512
				 | tsp_instruction_word::texture_v_size::_512
    				 | tsp_instruction_word::use_alpha;
    break;
  default: break;
  }
  parameter.append<global_polygon_type_0>() = polygon;

  for (uint32_t i = 0; i < strip_length; i++) {
    bool end_of_strip = i == strip_length - 1;

    float x = strip_vertices[i].x;
    float y = strip_vertices[i].y;
    float z = strip_vertices[i].z;
    float t;

    t  = y * __builtin_cosf(theta) - z * __builtin_sinf(theta);
    z  = y * __builtin_sinf(theta) + z * __builtin_cosf(theta);
    y  = t;

    float theta2 = 3.14 * __builtin_sinf(theta / 2);

    t  = x * __builtin_cosf(theta2) - z * __builtin_sinf(theta2);
    z  = x * __builtin_sinf(theta2) + z * __builtin_cosf(theta2);
    x  = t;

    z += 3;

    // perspective
    x = x / z;
    y = y / z;

    x *= static_cast<float>(screen_height) * 0.7;
    y *= static_cast<float>(screen_height) * 0.7;
    x += static_cast<float>(screen_width  / 2);
    y += static_cast<float>(screen_height / 2);

    z = 1 / z;

    parameter.append<vertex_polygon_type_3>() =
      vertex_polygon_type_3(x, y, z,
			    strip_vertices[i].u,
			    strip_vertices[i].v,
			    color,
			    end_of_strip);
  }
}

void copy_macaw_texture()
{
  auto src = reinterpret_cast<const uint8_t *>(&_binary_macaw_data_start);
  auto size  = reinterpret_cast<const uint32_t>(&_binary_macaw_data_size);
  auto mem = reinterpret_cast<volatile texture_memory_alloc *>(texture_memory64);
  for (uint32_t px = 0; px < size / 3; px++) {
    uint8_t r = src[px * 3 + 0];
    uint8_t g = src[px * 3 + 1];
    uint8_t b = src[px * 3 + 2];

    uint16_t rgb565 = ((r / 8) << 11) | ((g / 4) << 5) | ((b / 8) << 0);
    mem->texture[px] = rgb565;
  }
}

constexpr uint32_t ta_alloc = ta_alloc_ctrl::pt_opb::no_list
			    | ta_alloc_ctrl::tm_opb::no_list
			    | ta_alloc_ctrl::t_opb::no_list
			    | ta_alloc_ctrl::om_opb::no_list
			    | ta_alloc_ctrl::o_opb::_16x4byte;

constexpr struct opb_size opb_size = { .opaque = 16 * 4
				     , .opaque_modifier = 0
				     , .translucent = 0
				     , .translucent_modifier = 0
				     , .punch_through = 0
				     };

void render(const uint32_t width, const uint32_t height,
	    const uint32_t texture_address,
	    const uint32_t texture_width,
	    uint32_t * ta_parameter_buf)
{
  const uint32_t tiles = (width / 32) * (height / 32);
  ta_polygon_converter_init(opb_size.total() * tiles, ta_alloc,
			    width, height);

  auto parameter = ta_parameter_writer(ta_parameter_buf);
  for (uint32_t i = 0; i < num_faces; i++) {
    transform(parameter, cube_faces[i], 4,
	      width, height,
	      texture_address,
	      texture_width);
  }
  parameter.append<global_end_of_list>() = global_end_of_list();
  ta_polygon_converter_transfer(ta_parameter_buf, parameter.offset);
  ta_wait_opaque_list();
}

uint32_t _ta_parameter_buf[((32 * (5 * 6 + 1)) + 32) / 4];

void main()
{
  vga();
  copy_macaw_texture();

  // The address of `ta_parameter_buf` must be a multiple of 32 bytes.
  // This is mandatory for ch2-dma to the ta fifo polygon converter.
  uint32_t * ta_parameter_buf = align_32byte(_ta_parameter_buf);

  holly.SOFTRESET = softreset::pipeline_soft_reset
		  | softreset::ta_soft_reset;
  holly.SOFTRESET = 0;

  core_init();

  auto mem = reinterpret_cast<volatile texture_memory_alloc *>(texture_memory32);

  uint32_t frame_ix = 0;
  constexpr uint32_t num_frames = 1;

  constexpr uint32_t texture_size = 256;

  while (1) {
    region_array2(mem->region_array,
		  (offsetof (struct texture_memory_alloc, object_list)),
		  texture_size / 32, // width
		  texture_size / 32, // height
		  opb_size
		  );

    background_parameter(mem->background, 0xffff00ff);

    render(texture_size, texture_size,
	   (offsetof (struct texture_memory_alloc, texture)),
	   128,
	   ta_parameter_buf);
    core_start_render(0x1000000 | (offsetof (struct texture_memory_alloc, texturebuffer)), // 64-bit area
		      texture_size, // linestride
		      0,   // framesize (dontcare)
		      0, 0);
    core_wait_end_of_render_video();

    background_parameter(mem->background, 0xff0000ff);

    region_array2(mem->region_array,
		  (offsetof (struct texture_memory_alloc, object_list)),
		  640 / 32, // width
		  480 / 32, // height
		  opb_size
		  );

    render(640, 480,
	   (offsetof (struct texture_memory_alloc, texturebuffer)),
	   texture_size,
	   ta_parameter_buf);
    core_start_render(0x0000000 + (offsetof (struct texture_memory_alloc, framebuffer)),  // 32-bit area
		      640,        // linestride
		      0x00096000, // framesize
		      frame_ix, num_frames);
    v_sync_in();
    core_wait_end_of_render_video(frame_ix, num_frames);

    theta += half_degree;
    frame_ix += 1;
  }
}