// @todo: On save rename files, delete files it should apply the changes
// Instead of toying with Reopen maybe it should actually detect changes in directory etc. on update

void CMD_OpenUpFolder() {
// @todo: Test this for weird cases
    BSet main = GetBSet(PrimaryWindowID);
    String name = ChopLastSlash(main.buffer->name);
    Open(name);
} RegisterCommand(CMD_OpenUpFolder, "ctrl-o", "Open current's file directory or up directory in other cases");

void CMD_OpenSystemFileBrowser() {
    Scratch scratch;
    String string = GetPrimaryDirectory();
#if OS_WINDOWS
    Open(Format(scratch, "!!explorer %S", string));
#else
    Open(Format(scratch, "!!xdg-open %S & disown", string));
#endif
} RegisterCommand(CMD_OpenSystemFileBrowser, "ctrl-alt-r", "Opens the directory of current file in the systems file browser");

void InsertDirectoryNavigation(Buffer *buffer) {
    Assert(buffer->is_dir);
    Scratch scratch;
    ResetBuffer(buffer);
    RawAppendf(buffer, "\n");
    RawAppendf(buffer, "..\n");
    for (FileIter it = IterateFiles(scratch, buffer->name); IsValid(it); Advance(&it)) {
        RawAppendf(buffer, "%S\n", it.filename);
    }
}

void UpdateDirectoryNavigation() {
#if 0
    ProfileFunction();
    BSet active = GetBSet(ActiveWindowID);
    Buffer *buffer = active.buffer;

    Scratch scratch;
    Array<String> existing_lines = Split(scratch, AllocCharString(scratch, buffer), "\n");
    bool modified = false;
    for (FileIter it = IterateFiles(scratch, buffer->name); IsValid(it); Advance(&it)) {
        bool found = false;
        ForItem (existing, existing_lines) {
            if (existing == it.filename) {
                found = true;
                UnorderedRemove(&existing_lines, existing);
                break;
            }
        }

        if (found == false) {
            modified = true;
            break;
        }
    }

    if (existing_lines.len > 1) {
        modified = true;
    }

    if (modified) {
        ReopenBuffer(buffer);
    }

    UpdateFuzzySearchView();
#endif
}

void OpenDirectoryNavigation(View *view) {
    SetFuzzy(view);
    // view->update_hook = UpdateDirectoryNavigation;
    Buffer *buffer = GetBuffer(view->active_buffer);
    InsertDirectoryNavigation(buffer);
    SelectRange(view, Range{});
}

#if 0

typedef struct {
    HANDLE dir;
    OVERLAPPED ov;
    HANDLE event;
    BYTE buffer[4096];
    BOOL pending;
} DirectoryWatcher;

BOOL InitDirectoryWatcher(DirectoryWatcher *w, const wchar_t *path)
{
    ZeroMemory(w, sizeof(*w));

    w->dir = CreateFileW(
        path,
        FILE_LIST_DIRECTORY,
        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
        NULL,
        OPEN_EXISTING,
        FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED,
        NULL
    );

    if (w->dir == INVALID_HANDLE_VALUE)
        return FALSE;

    w->event = CreateEventW(NULL, TRUE, FALSE, NULL);
    if (!w->event)
        return FALSE;

    w->ov.hEvent = w->event;
    w->pending = FALSE;
    return TRUE;
}

BOOL WasDirectoryModified(DirectoryWatcher *w)
{
    DWORD bytes;

    if (!w->pending) {
        ResetEvent(w->event);
        w->pending = ReadDirectoryChangesW(
            w->dir,
            w->buffer,
            sizeof(w->buffer),
            TRUE,
            FILE_NOTIFY_CHANGE_FILE_NAME |
            FILE_NOTIFY_CHANGE_DIR_NAME  |
            FILE_NOTIFY_CHANGE_SIZE      |
            FILE_NOTIFY_CHANGE_LAST_WRITE,
            NULL,
            &w->ov,
            NULL
        );
        if (!w->pending)
            return FALSE;
    }

    if (WaitForSingleObject(w->event, 0) == WAIT_OBJECT_0) {
        GetOverlappedResult(w->dir, &w->ov, &bytes, FALSE);
        w->pending = FALSE;
        return TRUE;
    }

    return FALSE;
}

void DestroyDirectoryWatcher(DirectoryWatcher *w)
{
    if (w->dir != INVALID_HANDLE_VALUE)
        CloseHandle(w->dir);
    if (w->event)
        CloseHandle(w->event);
}

//
DirectoryWatcher w;
InitDirectoryWatcher(&w, L"C:\\mydir");

if (WasDirectoryModified(&w)) {
    // something changed
}

#if OS_LINUX
#include <sys/inotify.h>
#include <unistd.h>
#include <fcntl.h>

typedef struct {
    int fd;
    int wd;
} DirectoryWatcher;

int InitDirectoryWatcher(DirectoryWatcher *w, const char *path)
{
    w->fd = inotify_init1(IN_NONBLOCK);
    if (w->fd < 0)
        return 0;

    w->wd = inotify_add_watch(
        w->fd,
        path,
        IN_CREATE | IN_DELETE | IN_MOVE | IN_MODIFY
    );

    return w->wd >= 0;
}

int WasDirectoryModified(DirectoryWatcher *w)
{
    char buffer[4096];
    ssize_t len = read(w->fd, buffer, sizeof(buffer));

    if (len > 0)
        return 1;

    return 0;  // no data = no changes
}

void DestroyDirectoryWatcher(DirectoryWatcher *w)
{
    if (w->wd >= 0)
        inotify_rm_watch(w->fd, w->wd);
    if (w->fd >= 0)
        close(w->fd);
}
#endif

#endif