/*
 * BoltClam portable Windows launcher.
 *
 * This is a tiny GUI-subsystem bootstrap for the portable package. It finds
 * the runtime beside itself, starts pythonw.exe with the bundled app, and
 * exits immediately. It contains no product logic; the Qt application lives
 * in app/boltclam.
 *
 * Build (from the repository root):
 *   zig cc -target x86_64-windows-gnu -O2 -mwindows packaging/launcher.c \
 *       -o build/portable/BoltClam.exe
 */
#define UNICODE
#define _UNICODE
#include <windows.h>
#include <wchar.h>

static void fail(const wchar_t *message) {
    MessageBoxW(NULL, message, L"BoltClam", MB_OK | MB_ICONERROR);
}

int WINAPI WinMain(HINSTANCE instance, HINSTANCE previous, LPSTR command_line, int show) {
    (void)instance;
    (void)previous;
    (void)command_line;
    (void)show;

    wchar_t exe[MAX_PATH];
    DWORD length = GetModuleFileNameW(NULL, exe, MAX_PATH);
    if (length == 0 || length >= MAX_PATH) {
        fail(L"BoltClam could not locate its own executable.");
        return 1;
    }
    wchar_t *slash = wcsrchr(exe, L'\\');
    if (slash == NULL) {
        fail(L"BoltClam could not locate its runtime folder.");
        return 1;
    }
    *slash = L'\0';

    wchar_t pythonw[MAX_PATH * 2];
    _snwprintf(pythonw, MAX_PATH * 2, L"%s\\pythonw.exe", exe);
    if (GetFileAttributesW(pythonw) == INVALID_FILE_ATTRIBUTES) {
        fail(L"BoltClam's runtime is incomplete: pythonw.exe is missing.\n\n"
             L"Extract the whole portable folder, not just BoltClam.exe.");
        return 1;
    }

    wchar_t appdir[MAX_PATH * 2];
    _snwprintf(appdir, MAX_PATH * 2, L"%s\\app", exe);
    if (GetFileAttributesW(appdir) == INVALID_FILE_ATTRIBUTES) {
        fail(L"BoltClam's runtime is incomplete: the app folder is missing.\n\n"
             L"Extract the whole portable folder, not just BoltClam.exe.");
        return 1;
    }
    SetCurrentDirectoryW(appdir);

    wchar_t cmdline[MAX_PATH * 4];
    _snwprintf(cmdline, MAX_PATH * 4, L"\"%s\" -m boltclam", pythonw);

    STARTUPINFOW startup;
    PROCESS_INFORMATION process;
    ZeroMemory(&startup, sizeof(startup));
    ZeroMemory(&process, sizeof(process));
    startup.cb = sizeof(startup);
    if (!CreateProcessW(pythonw, cmdline, NULL, NULL, FALSE,
                        CREATE_UNICODE_ENVIRONMENT, NULL, appdir,
                        &startup, &process)) {
        wchar_t error[512];
        _snwprintf(error, 512,
                   L"BoltClam could not start its runtime (error %lu).",
                   (unsigned long)GetLastError());
        fail(error);
        return 1;
    }
    CloseHandle(process.hThread);
    CloseHandle(process.hProcess);
    return 0;
}