#include "utils.h"

#include <flutter_windows.h>
#include <io.h>
#include <stdio.h>
#include <windows.h>

#include <iostream>

void CreateAndAttachConsole() {
    if (::AllocConsole()) {
        FILE* unused;
        if (freopen_s(&unused, "CONOUT$", "w", stdout)) {
            _dup2(_fileno(stdout), 1);
        }
        if (freopen_s(&unused, "CONOUT$", "w", stderr)) {
            _dup2(_fileno(stdout), 2);
        }
        std::ios::sync_with_stdio();
        FlutterDesktopResyncOutputStreams();
    }
}

std::vector<std::string> GetCommandLineArguments() {
    // Convert the UTF-16 command line arguments to UTF-8 for the Engine to use.
    int argc;
    wchar_t** argv = ::CommandLineToArgvW(::GetCommandLineW(), &argc);
    if (argv == nullptr) {
        return std::vector<std::string>();
    }

    std::vector<std::string> command_line_arguments;

    // Skip the first argument as it's the binary name.
    for (int i = 1; i < argc; i++) {
        command_line_arguments.push_back(Utf8FromUtf16(argv[i]));
    }

    ::LocalFree(argv);

    return command_line_arguments;
}

std::string Utf8FromUtf16(const wchar_t* utf16_string) {
    if (utf16_string == nullptr) {
        return std::string();
    }
    int target_length =
        ::WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, utf16_string, -1, nullptr, 0, nullptr, nullptr) -
        1;  // remove the trailing null character
    int input_length = (int)wcslen(utf16_string);
    std::string utf8_string;
    if (target_length <= 0 || target_length > utf8_string.max_size()) {
        return utf8_string;
    }
    utf8_string.resize(target_length);
    int converted_length = ::WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, utf16_string, input_length,
                                                 utf8_string.data(), target_length, nullptr, nullptr);
    if (converted_length == 0) {
        return std::string();
    }
    return utf8_string;
}
