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#include "LuaLayoutContext.hpp"
#include "LuaLayoutTarget.hpp"
#include "../bindings/LuaBindingsInternal.hpp"
#include <algorithm>
#include <cmath>
#include <string_view>
using namespace Config::Lua::Layouts;
void Config::Lua::Layouts::pushBox(lua_State* L, const CBox& box) {
lua_newtable(L);
lua_pushnumber(L, box.x);
lua_setfield(L, -2, "x");
lua_pushnumber(L, box.y);
lua_setfield(L, -2, "y");
lua_pushnumber(L, box.w);
lua_setfield(L, -2, "w");
lua_pushnumber(L, box.h);
lua_setfield(L, -2, "h");
}
bool Config::Lua::Layouts::boxFromTable(lua_State* L, int idx, CBox& box) {
idx = lua_absindex(L, idx);
if (!lua_istable(L, idx))
return false;
auto getNum = [&](const char* key, double& out) -> bool {
lua_getfield(L, idx, key);
if (!lua_isnumber(L, -1)) {
lua_pop(L, 1);
return false;
}
out = lua_tonumber(L, -1);
lua_pop(L, 1);
return true;
};
return getNum("x", box.x) && getNum("y", box.y) && getNum("w", box.w) && getNum("h", box.h);
}
static CBox areaFromContext(lua_State* L, int idx) {
idx = lua_absindex(L, idx);
CBox area;
lua_getfield(L, idx, "area");
boxFromTable(L, -1, area);
lua_pop(L, 1);
return area;
}
static size_t targetCountFromContext(lua_State* L, int idx) {
idx = lua_absindex(L, idx);
size_t count = 0;
lua_getfield(L, idx, "targets");
if (lua_istable(L, -1))
count = lua_rawlen(L, -1);
lua_pop(L, 1);
return count;
}
static int ctxGridCell(lua_State* L) {
const auto AREA = areaFromContext(L, 1);
const int i = std::max(1, sc<int>(luaL_checkinteger(L, 2)));
const int cols = std::max(1, sc<int>(luaL_checkinteger(L, 3)));
int rows = 0;
if (lua_gettop(L) >= 4 && lua_isnumber(L, 4))
rows = std::max(1, sc<int>(lua_tointeger(L, 4)));
else {
const auto count = std::max<size_t>(1, targetCountFromContext(L, 1));
rows = std::max(1, sc<int>(std::ceil(sc<double>(count) / sc<double>(cols))));
}
const int row = (i - 1) / cols;
const int col = (i - 1) % cols;
pushBox(L, CBox{AREA.x + AREA.w * col / cols, AREA.y + AREA.h * row / rows, AREA.w / cols, AREA.h / rows}.noNegativeSize());
return 1;
}
static int ctxColumn(lua_State* L) {
const auto AREA = areaFromContext(L, 1);
const int i = std::max(1, sc<int>(luaL_checkinteger(L, 2)));
const int n = std::max(1, sc<int>(luaL_checkinteger(L, 3)));
pushBox(L, CBox{AREA.x + AREA.w * (i - 1) / n, AREA.y, AREA.w / n, AREA.h}.noNegativeSize());
return 1;
}
static int ctxRow(lua_State* L) {
const auto AREA = areaFromContext(L, 1);
const int i = std::max(1, sc<int>(luaL_checkinteger(L, 2)));
const int n = std::max(1, sc<int>(luaL_checkinteger(L, 3)));
pushBox(L, CBox{AREA.x, AREA.y + AREA.h * (i - 1) / n, AREA.w, AREA.h / n}.noNegativeSize());
return 1;
}
static int ctxSplit(lua_State* L) {
CBox area;
if (!boxFromTable(L, 2, area))
return Config::Lua::Bindings::Internal::configError(L, "ctx:split expects a box table as first argument");
const std::string_view side = luaL_checkstring(L, 3);
const double ratio = std::clamp(luaL_checknumber(L, 4), 0.0, 1.0);
if (side == "left")
pushBox(L, CBox{area.x, area.y, area.w * ratio, area.h}.noNegativeSize());
else if (side == "right")
pushBox(L, CBox{area.x + area.w * (1.0 - ratio), area.y, area.w * ratio, area.h}.noNegativeSize());
else if (side == "top" || side == "up")
pushBox(L, CBox{area.x, area.y, area.w, area.h * ratio}.noNegativeSize());
else if (side == "bottom" || side == "down")
pushBox(L, CBox{area.x, area.y + area.h * (1.0 - ratio), area.w, area.h * ratio}.noNegativeSize());
else
return Config::Lua::Bindings::Internal::configError(L, "ctx:split side must be left, right, top, or bottom");
return 1;
}
void Config::Lua::Layouts::pushLayoutContext(lua_State* L, const std::vector<SP<Layout::ITarget>>& targets, const CBox& area) {
lua_newtable(L);
pushBox(L, area);
lua_setfield(L, -2, "area");
lua_newtable(L);
int i = 1;
for (const auto& target : targets) {
pushLayoutTarget(L, target, i);
lua_rawseti(L, -2, i++);
}
lua_setfield(L, -2, "targets");
lua_pushcfunction(L, ctxGridCell);
lua_setfield(L, -2, "grid_cell");
lua_pushcfunction(L, ctxColumn);
lua_setfield(L, -2, "column");
lua_pushcfunction(L, ctxRow);
lua_setfield(L, -2, "row");
lua_pushcfunction(L, ctxSplit);
lua_setfield(L, -2, "split");
}
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