#include "game.h"

#include <gfx/error.h>
#include <gfx/render_backend.h>
#include <gfx/scene/camera.h>
#include <gfx/scene/material.h>
#include <gfx/scene/mesh.h>
#include <gfx/scene/node.h>
#include <gfx/scene/object.h>
#include <gfx/util/geometry.h>
#include <gfx/util/scene.h>
#include <gfx/util/shader.h>
#include <gfx/util/skyquad.h>
#include <gfx/util/texture.h>

#include <log/log.h>
#include <math/camera.h>

#include <assert.h>
#include <stdbool.h>
#include <stdio.h>

// Paths to various scene files.
static const char* BOX     = "/assets/models/box.gltf";
static const char* SUZANNE = "/assets/models/suzanne.gltf";
static const char* SPONZA =
    "/assets/glTF-Sample-Models/2.0/Sponza/glTF/Sponza.gltf";
static const char* FLIGHT_HELMET =
    "/assets/glTF-Sample-Models/2.0/FlightHelmet/glTF/FlightHelmet.gltf";
static const char* DAMAGED_HELMET =
    "/assets/glTF-Sample-Models/2.0/DamagedHelmet/glTF/DamagedHelmet.gltf";
static const char* GIRL =
    "/home/jeanne/Nextcloud/assets/models/girl/girl-with-ground.gltf";

#define DEFAULT_SCENE_FILE GIRL

static const char* CLOUDS1_TEXTURE = "/assets/skybox/clouds1/clouds1_west.bmp";

/// Load the skyquad texture.
static Texture* load_environment_map(RenderBackend* render_backend) {
  return gfx_load_texture(
      render_backend,
      &(LoadTextureCmd){
          .origin                 = TextureFromFile,
          .type                   = LoadCubemap,
          .colour_space           = sRGB,
          .filtering              = NearestFiltering,
          .mipmaps                = false,
          .data.cubemap.filepaths = {
                                     mstring_make("/assets/skybox/clouds1/clouds1_east.bmp"),
                                     mstring_make("/assets/skybox/clouds1/clouds1_west.bmp"),
                                     mstring_make("/assets/skybox/clouds1/clouds1_up.bmp"),
                                     mstring_make("/assets/skybox/clouds1/clouds1_down.bmp"),
                                     mstring_make("/assets/skybox/clouds1/clouds1_south.bmp"),
                                     mstring_make("/assets/skybox/clouds1/clouds1_north.bmp")}
  });
}

/// Load the skyquad and return the environment light node.
static SceneNode* load_skyquad(Game* game) {
  assert(game);

  Texture* environment_map = load_environment_map(game->render_backend);
  if (!environment_map) {
    return 0;
  }

  return gfx_setup_skyquad(
      game->gfx, gfx_get_scene_root(game->scene), environment_map);
}

/// Load the 3D scene.
static SceneNode* load_scene(
    Game* game, const char* scene_filepath, const char* view_mode) {
  assert(game);

  game->camera = gfx_make_camera();
  if (!game->camera) {
    return 0;
  }
  Camera* camera = gfx_get_camera_camera(game->camera);
  spatial3_set_position(&camera->spatial, vec3_make(0, 0, 2));

  SceneNode* sky_light_node = load_skyquad(game);
  if (!sky_light_node) {
    return 0;
  }

  SceneNode* scene_node = gfx_load_scene(
      game->gfx, sky_light_node,
      &(LoadSceneCmd){.origin = SceneFromFile, .filepath = scene_filepath});
  if (!scene_node) {
    return 0;
  }

  gfx_log_node_hierarchy(gfx_get_scene_root(game->scene));

  return scene_node;
}

/// Load a scene for debugging textures.
static bool load_texture_debugger_scene(Game* game) {
  assert(game);

  Texture* texture = gfx_load_texture(
      game->render_backend,
      &(LoadTextureCmd){
          .origin                = TextureFromFile,
          .type                  = LoadTexture,
          .filtering             = LinearFiltering,
          .mipmaps               = false,
          .data.texture.filepath = mstring_make(CLOUDS1_TEXTURE)});

  game->camera = gfx_make_camera();
  if (!game->camera) {
    return false;
  }
  Camera* camera = gfx_get_camera_camera(game->camera);
  spatial3_set_position(&camera->spatial, vec3_make(0, 0, 1));

  ShaderProgram* shader = gfx_make_view_texture_shader(game->render_backend);
  if (!shader) {
    return false;
  }

  Geometry* geometry = gfx_make_quad_11(game->render_backend);
  if (!geometry) {
    return false;
  }

  MaterialDesc material_desc = (MaterialDesc){0};
  material_desc.uniforms[0]  = (ShaderUniform){
       .type          = UniformTexture,
       .value.texture = texture,
       .name          = sstring_make("Texture")};
  material_desc.num_uniforms = 1;
  Material* material         = gfx_make_material(&material_desc);
  if (!material) {
    return false;
  }

  MeshDesc mesh_desc = (MeshDesc){0};
  mesh_desc.geometry = geometry;
  mesh_desc.material = material;
  mesh_desc.shader   = shader;
  Mesh* mesh         = gfx_make_mesh(&mesh_desc);
  if (!mesh) {
    return false;
  }

  SceneObject* object = gfx_make_object();
  if (!object) {
    return false;
  }
  gfx_add_object_mesh(object, mesh);

  SceneNode* node = gfx_make_object_node(object);
  SceneNode* root = gfx_get_scene_root(game->scene);
  gfx_set_node_parent(node, root);

  return true;
}

/// Render the bounding boxes of all scene objects.
static void render_bounding_boxes(ImmRenderer* imm, const SceneNode* node) {
  if (gfx_get_node_type(node) == ObjectNode) {
    // TODO: Look at the scene log. The JointNodes are detached from the
    // ObjectNodes. This is why the boxes are not being transformed as expected
    // here. Anima needs to animate boxes? Use OOBB in addition to AABB?
    const mat4         model = gfx_get_node_global_transform(node);
    const SceneObject* obj   = gfx_get_node_object(node);
    const aabb3        box   = gfx_calc_object_aabb(obj);
    gfx_imm_set_model_matrix(imm, &model);
    gfx_imm_draw_aabb(imm, box);
  }

  // Render children's boxes.
  for (NodeIter it = gfx_get_node_child(node); it;
       it          = gfx_get_next_child(it)) {
    render_bounding_boxes(imm, gfx_get_iter_node(it));
  }
}

bool game_new(Game* game, int argc, const char** argv) {
  // TODO: getopt() to implement proper argument parsing.
  const char* scene_filepath = argc > 1 ? argv[1] : DEFAULT_SCENE_FILE;
  const char* view_mode      = argc > 2 ? argv[2] : "";

  game->gfx = gfx_init();
  if (!game->gfx) {
    goto cleanup;
  }

  game->render_backend = gfx_get_render_backend(game->gfx);
  game->renderer       = gfx_get_renderer(game->gfx);

  game->scene = gfx_make_scene();
  if (!game->scene) {
    goto cleanup;
  }

  game->root_node = load_scene(game, scene_filepath, view_mode);
  if (!game->root_node) {
    goto cleanup;
  }
  /*if (!load_texture_debugger_scene(game)) {
    goto cleanup;
  }*/

  Anima* anima = gfx_get_node_anima(game->root_node);

  // const bool play_result = gfx_play_animation(
  //     anima, &(AnimationPlaySettings){.name = "Defiant stance", .loop =
  //     false});
  const bool play_result = gfx_play_animation(
      anima, &(AnimationPlaySettings){.name = "Walk", .loop = true});
  // assert(play_result);

  return true;

cleanup:
  LOGE("Gfx error: %s", gfx_get_error());
  if (game->gfx) {
    gfx_destroy(&game->gfx);
  }
  return false;
}

void game_end(Game* game) { gfx_destroy(&game->gfx); }

void game_update(Game* game, double t, double dt) {
  // LOGD("Tick");

  gfx_animate_scene(game->scene, (R)t);

  // TODO: Compute bounding boxes to then find a good orbit point and radius
  // for each scene.
  const vec3 orbit_point = vec3_make(0, 2, 0);
  Camera*    camera      = gfx_get_camera_camera(game->camera);
  spatial3_orbit(
      &camera->spatial, orbit_point,
      /*radius=*/2.5,
      /*azimuth=*/t * 0.5, /*zenith=*/0);
  spatial3_lookat(&camera->spatial, orbit_point);

  // spatial3_set_position(&camera->spatial, vec3_make(0, 0, 2));
  // spatial3_lookat(&camera->spatial, vec3_make(0, 0, -1));

  // spatial3_orbit(
  //     &camera->spatial, vec3_make(0, 0, 0),
  //     /*radius=*/2.5,
  //     /*azimuth=*/t * 0.2, /*zenith=*/0);
  // spatial3_lookat(&camera->spatial, vec3_make(0, 0, 0));
}

void game_render(const Game* game) {
  gfx_render_scene(
      game->renderer,
      &(RenderSceneParams){
          .mode = RenderDefault, .scene = game->scene, .camera = game->camera});

  ImmRenderer* imm = gfx_get_imm_renderer(game->gfx);
  assert(imm);
  gfx_imm_start(imm);
  gfx_imm_set_camera(imm, gfx_get_camera_camera(game->camera));
  gfx_imm_set_colour(imm, vec4_make(0.2, 0.2, 1.0, 0.3));
  render_bounding_boxes(imm, gfx_get_scene_root(game->scene));
  gfx_imm_end(imm);
}

void game_set_viewport(Game* game, int width, int height) {
  gfx_set_viewport(game->render_backend, width, height);

  const R    fovy       = 90 * TO_RAD;
  const R    aspect     = (R)width / (R)height;
  const R    near       = 0.1;
  const R    far        = 1000;
  const mat4 projection = mat4_perspective(fovy, aspect, near, far);

  Camera* camera     = gfx_get_camera_camera(game->camera);
  camera->projection = projection;
}