//
// xemu User Interface
//
// Copyright (C) 2026 Matt Borgerson
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
#include "misc.hh"
#include <SDL3/SDL_init.h>
#include <SDL3/SDL_filesystem.h>
#include <SDL3/SDL_platform_defines.h>
#include <filesystem>
#include <string>

static void RunOnMainThread(std::function<void()> &&func)
{
    auto p = new std::function<void()>(std::move(func));
    if (!SDL_RunOnMainThread(
            [](void *userdata) {
                std::unique_ptr<std::function<void()>> f(
                    static_cast<std::function<void()> *>(userdata));
                xemu_main_loop_lock();
                (*f)();
                xemu_main_loop_unlock();
            },
            p, false)) {
        delete p;
    }
}

static void FileDialogCallbackWrapper(void *userdata,
                                      const char *const *filelist, int filter)
{
    std::unique_ptr<FileDialogCallback> callback(
        static_cast<FileDialogCallback *>(userdata));
    if (filelist && filelist[0]) {
        std::string path = filelist[0];
        RunOnMainThread([callback = std::move(*callback),
                         path = std::move(path)]() { callback(path.c_str()); });
    }
}

// Workaround SDL3 default_location handling:
// - Linux: only supports folder paths, not file paths as documented
// - Windows/macOS: directories need trailing separator for proper display
static std::string NormalizeDefaultLocation(const char *default_location)
{
    if (!default_location || !*default_location) {
        return {};
    }

    try {
        std::filesystem::path path(default_location);
#if defined(SDL_PLATFORM_LINUX)
        if (std::filesystem::is_regular_file(path)) {
            return path.parent_path().string();
        }
#elif defined(SDL_PLATFORM_WINDOWS) || defined(SDL_PLATFORM_MACOS)
        if (std::filesystem::is_directory(path)) {
            return (path / "").string();
        }
        // Prevent a crash in SDL3 file dialog
        if (!std::filesystem::exists(path)) {
            return {};
        }
#endif
    } catch (...) {
        // Fall through to return original path
    }
    return default_location;
}

void ShowOpenFileDialog(const SDL_DialogFileFilter *filters, int nfilters,
                        const char *default_location,
                        FileDialogCallback callback)
{
    auto *cb = new FileDialogCallback(std::move(callback));
    std::string normalized = NormalizeDefaultLocation(default_location);
    SDL_ShowOpenFileDialog(FileDialogCallbackWrapper, cb, xemu_get_window(),
                           filters, nfilters,
                           normalized.empty() ? nullptr : normalized.c_str(),
                           false);
}

void ShowSaveFileDialog(const SDL_DialogFileFilter *filters, int nfilters,
                        const char *default_location,
                        FileDialogCallback callback)
{
    auto *cb = new FileDialogCallback(std::move(callback));
    SDL_ShowSaveFileDialog(FileDialogCallbackWrapper, cb, xemu_get_window(),
                           filters, nfilters, default_location);
}

void ShowOpenFolderDialog(const char *default_location,
                          FileDialogCallback callback)
{
    auto *cb = new FileDialogCallback(std::move(callback));
    SDL_ShowOpenFolderDialog(FileDialogCallbackWrapper, cb,
                             xemu_get_window(), default_location, false);
}