#include "luavgl.h"
#include "private.h"

typedef struct luavgl_disp_s {
  lv_disp_t *disp;
} luavgl_disp_t;

static luavgl_disp_t *luavgl_check_disp(lua_State *L, int idx)
{
  luavgl_disp_t *v = luaL_checkudata(L, idx, "lv_disp");

  return v;
}

static lv_disp_t *luavgl_to_disp(lua_State *L, int idx)
{
  return luavgl_check_disp(L, idx)->disp;
}

static int luavgl_disp_get(lua_State *L, lv_disp_t *disp)
{
  /* check if already exists */
  lua_pushlightuserdata(L, disp);
  lua_rawget(L, LUA_REGISTRYINDEX);

  if (lua_isnoneornil(L, -1)) {
    /* create new disp userdata and add to registry forever */
    lua_pop(L, 1);
    luavgl_disp_t *d = lua_newuserdata(L, sizeof(luavgl_disp_t));
    d->disp = disp;

    luaL_getmetatable(L, "lv_disp");
    lua_setmetatable(L, -2);

    lua_pushlightuserdata(L, disp);
    lua_pushvalue(L, -2);
    lua_rawset(L, LUA_REGISTRYINDEX);
  }

  return 1;
}

static int luavgl_disp_get_default(lua_State *L)
{
  lv_disp_t *disp = lv_disp_get_default();
  return luavgl_disp_get(L, disp);
}

static int luavgl_disp_get_scr_act(lua_State *L)
{
  lv_disp_t *disp = NULL;
  if (!lua_isnoneornil(L, 1))
    disp = luavgl_to_disp(L, 1);

  lv_obj_t *obj = lv_disp_get_scr_act(disp);
  if (obj == NULL) {
    lua_pushnil(L);
    return 1;
  }

  /* registry[obj] */
  lua_pushlightuserdata(L, obj);
  lua_rawget(L, LUA_REGISTRYINDEX);

  if (lua_isnoneornil(L, -1)) {
    luavgl_add_lobj(L, obj)->lua_created = false;
  }

  return 1;
}

static int luavgl_disp_get_scr_prev(lua_State *L)
{
  luavgl_disp_t *d = luavgl_check_disp(L, 1);
  lv_obj_t *obj = lv_disp_get_scr_prev(d->disp);
  if (obj == NULL) {
    lua_pushnil(L);
    return 1;
  }

  /* registry[obj] */
  lua_pushlightuserdata(L, obj);
  lua_rawget(L, LUA_REGISTRYINDEX);

  if (lua_isnoneornil(L, -1)) {
    luavgl_add_lobj(L, obj)->lua_created = false;
  }

  return 1;
}

/**
 * luavgl.disp.load_scr(obj, {
 *    anim = "over_left",
 *    time = 1000,
 *    delay = 100,
 * })
 */
static int luavgl_disp_load_scr(lua_State *L)
{
  lv_obj_t *obj = luavgl_to_obj(L, 1);
  if (!lua_istable(L, 2)) {
    lv_disp_load_scr(obj);
    return 0;
  }

  /* has parameter table */
  lv_screen_load_anim_t anim = LV_SCR_LOAD_ANIM_NONE;
  uint32_t time = 0;
  uint32_t delay = 0;
  bool auto_del = false;

  const char *str;
  lua_getfield(L, 2, "anim");
  str = lua_tostring(L, -1);
  if (str == NULL || lv_strcmp(str, "none") == 0) {
    ; /* use default */
  } else if (lv_strcmp(str, "over_left") == 0) {
    anim = LV_SCR_LOAD_ANIM_OVER_LEFT;
  } else if (lv_strcmp(str, "over_right") == 0) {
    anim = LV_SCR_LOAD_ANIM_OVER_RIGHT;
  } else if (lv_strcmp(str, "over_top") == 0) {
    anim = LV_SCR_LOAD_ANIM_OVER_TOP;
  } else if (lv_strcmp(str, "over_botto") == 0) {
    anim = LV_SCR_LOAD_ANIM_OVER_BOTTOM;
  } else if (lv_strcmp(str, "move_left") == 0) {
    anim = LV_SCR_LOAD_ANIM_MOVE_LEFT;
  } else if (lv_strcmp(str, "move_right") == 0) {
    anim = LV_SCR_LOAD_ANIM_MOVE_RIGHT;
  } else if (lv_strcmp(str, "move_top") == 0) {
    anim = LV_SCR_LOAD_ANIM_MOVE_TOP;
  } else if (lv_strcmp(str, "move_botto") == 0) {
    anim = LV_SCR_LOAD_ANIM_MOVE_BOTTOM;
  } else if (lv_strcmp(str, "fade_on") == 0) {
    anim = LV_SCR_LOAD_ANIM_FADE_ON;
#if LV_VERSION_CHECK(8, 3, 0)
  } else if (lv_strcmp(str, "fade_in") == 0) {
    anim = LV_SCR_LOAD_ANIM_FADE_IN;
  } else if (lv_strcmp(str, "fade_out") == 0) {
    anim = LV_SCR_LOAD_ANIM_FADE_OUT;
  } else if (lv_strcmp(str, "out_left") == 0) {
    anim = LV_SCR_LOAD_ANIM_OUT_LEFT;
  } else if (lv_strcmp(str, "out_right") == 0) {
    anim = LV_SCR_LOAD_ANIM_OUT_RIGHT;
  } else if (lv_strcmp(str, "out_top") == 0) {
    anim = LV_SCR_LOAD_ANIM_OUT_TOP;
  } else if (lv_strcmp(str, "out_bottom") == 0) {
    anim = LV_SCR_LOAD_ANIM_OUT_BOTTOM;
#endif
  }
  lua_pop(L, 1);

  lua_getfield(L, 2, "time");
  time = luavgl_tointeger(L, -1);
  lua_pop(L, 1);

  lua_getfield(L, 2, "delay");
  delay = luavgl_tointeger(L, -1);
  lua_pop(L, 1);

  lua_getfield(L, 2, "auto_del");
  auto_del = luavgl_tointeger(L, -1);
  lua_pop(L, 1);

  lv_screen_load_anim(obj, anim, time, delay, auto_del);
  return 0;
}

static int luavgl_disp_get_layer_top(lua_State *L)
{
  luavgl_disp_t *d = luavgl_check_disp(L, 1);
  lv_obj_t *obj = lv_disp_get_layer_top(d->disp);
  if (obj == NULL) {
    lua_pushnil(L);
    return 1;
  }

  /* registry[obj] */
  lua_pushlightuserdata(L, obj);
  lua_rawget(L, LUA_REGISTRYINDEX);

  if (lua_isnoneornil(L, -1)) {
    luavgl_add_lobj(L, obj)->lua_created = false;
  }

  return 1;
}

static int luavgl_disp_get_layer_sys(lua_State *L)
{
  luavgl_disp_t *d = luavgl_check_disp(L, 1);
  lv_obj_t *obj = lv_disp_get_layer_sys(d->disp);
  if (obj == NULL) {
    lua_pushnil(L);
    return 1;
  }

  /* registry[obj] */
  lua_pushlightuserdata(L, obj);
  lua_rawget(L, LUA_REGISTRYINDEX);

  if (lua_isnoneornil(L, -1)) {
    luavgl_add_lobj(L, obj)->lua_created = false;
  }

  return 1;
}

static int luavgl_disp_get_next(lua_State *L)
{
  lv_disp_t *disp = NULL;
  if (!lua_isnoneornil(L, 1)) {
    disp = luavgl_check_disp(L, 1)->disp;
  }

  disp = lv_disp_get_next(disp);
  if (disp == NULL) {
    lua_pushnil(L);
    return 1;
  }

  return luavgl_disp_get(L, disp);
}

static int luavgl_disp_get_res(lua_State *L)
{
  luavgl_disp_t *d = luavgl_check_disp(L, 1);
  lua_pushinteger(L, lv_disp_get_hor_res(d->disp));
  lua_pushinteger(L, lv_disp_get_ver_res(d->disp));
  return 2;
}

static int luavgl_disp_set_rotation(lua_State *L)
{
  luavgl_disp_t *d = luavgl_check_disp(L, 1);
  uint32_t r = lua_tointeger(L, 2);

  lv_display_rotation_t rot;
  if (r == 0)
    rot = LV_DISPLAY_ROTATION_0;
  else if (r == 90)
    rot = LV_DISPLAY_ROTATION_90;
  else if (r == 180)
    rot = LV_DISPLAY_ROTATION_180;
  else if (r == 270)
    rot = LV_DISPLAY_ROTATION_270;
  else {
    return luaL_argerror(L, 2, "invalid rotation value");
  }

  lv_display_set_rotation(d->disp, rot);
  return 0;
}

/**
 * luavgl.disp lib
 */
static const luaL_Reg disp_lib[] = {
    {"get_default",  luavgl_disp_get_default },
    {"get_scr_act",  luavgl_disp_get_scr_act },
    {"get_scr_prev", luavgl_disp_get_scr_prev},
    {"get_next",     luavgl_disp_get_next    },
    {"load_scr",     luavgl_disp_load_scr    },

    {NULL,           NULL                    },
};

/*
** methods for disp handles
*/
static const luaL_Reg disp_methods[] = {
    {"get_layer_top", luavgl_disp_get_layer_top},
    {"get_layer_sys", luavgl_disp_get_layer_sys},
    {"get_next",      luavgl_disp_get_next     },
    {"set_rotation",  luavgl_disp_set_rotation },
    {"get_res",       luavgl_disp_get_res      },

    {"get_scr_act",   luavgl_disp_get_scr_act  },
    {"get_scr_prev",  luavgl_disp_get_scr_prev },

    {NULL,            NULL                     },
};

static const luaL_Reg disp_meta[] = {
    {"__index", NULL}, /* place holder */

    {NULL,      NULL}
};

static void luavgl_disp_init(lua_State *L)
{
  /* create lv_fs metatable */
  luaL_newmetatable(L, "lv_disp");
  luaL_setfuncs(L, disp_meta, 0);

  luaL_newlib(L, disp_methods);
  lua_setfield(L, -2, "__index");

  lua_pop(L, 1); /* pop metatable */

  /* luavgl.disp lib */
  luaL_newlib(L, disp_lib);
  lua_setfield(L, -2, "disp");
}