#include "lib.h"
#include <filesystem>
#include <iostream>

namespace fs = std::filesystem;

static const luaL_Reg lua_fs[] = {
    {"file_exists", file_exists}, {"is_regular_file", is_regular_file}, {"copy_file", copy_file},
    {"delete_file", delete_file}, {"get_dir_files", get_dir_files},     {NULL, NULL}};

int file_exists(lua_State* L)
{
    const char* path = luaL_checkstring(L, 1);
    bool result = fs::exists(path);
    lua_pushboolean(L, result);
    return 1;
}

/// @brief 文件是否是一个常规文件
/// @param path 文件路径
/// @return 
int is_regular_file(lua_State* L)
{
    const char* path = luaL_checkstring(L, 1);
    bool result = fs::is_regular_file(path);
    lua_pushboolean(L, result);
    return 1;
}

/// @brief 复制文件
/// @param source 源文件(string)
/// @param destination 目标文件(string)
/// @return bool
int copy_file(lua_State* L)
{
    const char* source = luaL_checkstring(L, 1);
    const char* destination = luaL_checkstring(L, 2);
    bool result = fs::copy_file(source, destination);
    lua_pushboolean(L, result);
    return 1;
}

int delete_file(lua_State* L)
{
    const char* path = luaL_checkstring(L, 1);
    bool result = fs::remove(path);
    lua_pushboolean(L, result);
    return 1;
}

int luaopen_lua_fs(lua_State* L)
{
    luaL_newlib(L, lua_fs);
    return 1;
}

int get_dir_files(lua_State* L)
{
    // 获取第一个参数：目录路径
    const char* dir_path = luaL_checkstring(L, 1);

    // 检查目录是否存在
    if (!fs::exists(dir_path) || !fs::is_directory(dir_path)) {
        lua_pushnil(L);
        lua_pushstring(L, "Invalid directory path");
        return 2;   // 返回 nil 和错误信息
    }

    // 创建一个新的 Lua 表用于存放文件列表
    lua_newtable(L);
    int table_index = lua_gettop(L);   // 获取当前 Lua 表的位置

    int index = 1;
    for (const auto& entry : fs::directory_iterator(dir_path)) {
        if (fs::is_regular_file(entry.status())) {
            lua_pushstring(L, entry.path().filename().string().c_str());
            lua_rawseti(L, table_index, index);
            index++;
        }
    }
    return 1;
}