#include "VSTEditor.hpp"
#include "VSTBackend.hpp"
#include "FileOpenDialog.hpp"
#include <Windowsx.h>
#include <shellapi.h>
#include <algorithm>
#include <Shlwapi.h>

#undef min
#undef max

extern void* hInstance;
static WNDPROC OriginalListViewProc = 0;
static HBRUSH gGreyBorderBrush;

namespace amuse {

VSTEditor::VSTEditor(VSTBackend& backend) : AEffEditor(&backend), m_backend(backend) {}

bool VSTEditor::getRect(ERect** rect) {
  *rect = &m_windowRect;
  return true;
}

LRESULT CALLBACK VSTEditor::WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
  VSTEditor& editor = *reinterpret_cast<VSTEditor*>(GetWindowLongPtrW(hwnd, 0));
  switch (uMsg) {
  case WM_NOTIFY: {
    NMHDR& itemAct = *reinterpret_cast<LPNMHDR>(lParam);
    switch (itemAct.code) {
    case HDN_BEGINTRACK:
      return TRUE;
    case NM_CLICK: {
      NMITEMACTIVATE& itemAct = *reinterpret_cast<LPNMITEMACTIVATE>(lParam);
      if (itemAct.hdr.hwndFrom == editor.m_groupListView)
        editor.selectGroup(itemAct.iItem);
      else if (itemAct.hdr.hwndFrom == editor.m_pageListView)
        editor.selectPage(itemAct.iItem);
      return 0;
    }
    case TVN_SELCHANGED: {
      if (editor.m_deferredCollectionSel)
        return 0;
      NMTREEVIEW& itemAct = *reinterpret_cast<LPNMTREEVIEW>(lParam);
      if (itemAct.hdr.hwndFrom == editor.m_collectionTree)
        editor.selectCollection(itemAct.itemNew.lParam);
      return 0;
    }
    case TVN_GETDISPINFO: {
      NMTVDISPINFO& treeDispInfo = *reinterpret_cast<LPNMTVDISPINFO>(lParam);
      if (treeDispInfo.item.mask & TVIF_CHILDREN) {}
      return 0;
    }
    default:
      return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
  }
  case WM_COMMAND: {
    switch (HIWORD(wParam)) {
    case BN_CLICKED: {
      HWND button = HWND(lParam);
      if (button == editor.m_collectionAdd)
        editor.addAction();
      else if (button == editor.m_collectionRemove)
        editor.removeAction();
      return 0;
    }
    default:
      return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
  }
  case WM_ERASEBKGND: {
    RECT rect;
    GetClientRect(hwnd, &rect);
    FillRect(HDC(wParam), &rect, gGreyBorderBrush);
    return 1;
  }
  default:
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
  }
}

LRESULT CALLBACK VSTEditor::ColHeaderWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
  switch (uMsg) {
  case WM_SETCURSOR:
    return TRUE;
  case WM_LBUTTONDBLCLK:
    return 0;
  case WM_PAINT: {
    PAINTSTRUCT ps;
    HDC dc = BeginPaint(hwnd, &ps);
    RECT rect;
    GetClientRect(hwnd, &rect);

    TRIVERTEX verts[] = {{rect.left, rect.top, 0x6000, 0x6000, 0x7000, 0xff00},
                         {rect.right, rect.bottom, 0x2000, 0x2000, 0x2800, 0xff00}};
    GRADIENT_RECT grect = {0, 1};
    GradientFill(dc, verts, 2, &grect, 1, GRADIENT_FILL_RECT_V);

    SetTextColor(dc, RGB(255, 255, 255));
    SetBkMode(dc, TRANSPARENT);
    SelectObject(dc, GetStockObject(ANSI_VAR_FONT));
    rect.left += 6;

    LPWSTR str = LPWSTR(GetWindowLongPtrW(hwnd, GWLP_USERDATA));
    DrawText(dc, str, -1, &rect, DT_SINGLELINE | DT_VCENTER | DT_END_ELLIPSIS);

    EndPaint(hwnd, &ps);
    return 0;
  }
  }

  return CallWindowProc(OriginalListViewProc, hwnd, uMsg, wParam, lParam);
}

void VSTEditor::_reselectColumns() {
  if (m_deferredCollectionSel) {
    TreeView_SelectItem(m_collectionTree, m_deferredCollectionSel);
    m_deferredCollectionSel = 0;
  }
  if (m_selGroupIdx != -1)
    ListView_SetItemState(m_groupListView, m_selGroupIdx, LVIS_FOCUSED | LVIS_SELECTED, 0xf);
  if (m_selPageIdx != -1)
    ListView_SetItemState(m_pageListView, m_selPageIdx, LVIS_FOCUSED | LVIS_SELECTED, 0xf);
}

bool VSTEditor::open(void* ptr) {
  AEffEditor::open(ptr);
  HWND hostView = HWND(ptr);
  gGreyBorderBrush = CreateSolidBrush(RGB(100, 100, 100));

  WNDCLASSW notifyCls = {CS_HREDRAW | CS_VREDRAW,
                         WindowProc,
                         0,
                         8,
                         HINSTANCE(hInstance),
                         nullptr,
                         nullptr,
                         nullptr,
                         nullptr,
                         L"VSTNotify"};
  RegisterClassW(&notifyCls);

  m_rootView = CreateWindowW(L"VSTNotify", L"", WS_CHILD, 0, 0, m_windowRect.right, m_windowRect.bottom, hostView,
                             nullptr, HINSTANCE(hInstance), nullptr);
  SetWindowLongPtrW(m_rootView, 0, LONG_PTR(this));
  ShowWindow(m_rootView, SW_SHOW);

  TVINSERTSTRUCT treeItem = {};
  treeItem.hParent = TVI_ROOT;
  treeItem.hInsertAfter = TVI_LAST;

  treeItem.item.mask = TVIF_CHILDREN | TVIF_TEXT;
  treeItem.item.cChildren = 1;
  treeItem.item.pszText = L"Root A";

  LVCOLUMN column = {};
  column.mask = LVCF_FMT | LVCF_TEXT | LVCF_WIDTH;
  column.fmt = LVCFMT_LEFT | LVCFMT_FIXED_WIDTH;
  column.cx = 199;

  m_collectionTree =
      CreateWindowW(WC_TREEVIEW, L"",
                    WS_CHILD | WS_CLIPSIBLINGS | TVS_SHOWSELALWAYS | TVS_HASLINES | TVS_LINESATROOT | TVS_HASBUTTONS, 1,
                    25, 199, m_windowRect.bottom - m_windowRect.top - 26, m_rootView, nullptr, nullptr, nullptr);
  TreeView_SetBkColor(m_collectionTree, RGB(64, 64, 64));
  TreeView_SetTextColor(m_collectionTree, RGB(255, 255, 255));
  HTREEITEM rootItemA = TreeView_InsertItem(m_collectionTree, &treeItem);
  treeItem.item.pszText = L"Root B";
  HTREEITEM rootItemB = TreeView_InsertItem(m_collectionTree, &treeItem);
  treeItem.hParent = rootItemA;
  treeItem.item.cChildren = 0;
  treeItem.item.pszText = L"Child A";
  TreeView_InsertItem(m_collectionTree, &treeItem);
  treeItem.item.pszText = L"Child B";
  TreeView_InsertItem(m_collectionTree, &treeItem);
  treeItem.hParent = rootItemB;
  treeItem.item.pszText = L"Child A";
  TreeView_InsertItem(m_collectionTree, &treeItem);
  treeItem.item.pszText = L"Child B";
  TreeView_InsertItem(m_collectionTree, &treeItem);
  ShowWindow(m_collectionTree, SW_SHOW);

  HWND cHeader = CreateWindowW(WC_HEADER, L"", WS_CHILD, 1, 1, 199, 24, m_rootView, nullptr, nullptr, nullptr);
  SetWindowLongPtrW(cHeader, GWLP_USERDATA, LONG_PTR(L"Collection"));
  OriginalListViewProc = WNDPROC(SetWindowLongPtr(cHeader, GWLP_WNDPROC, LONG_PTR(ColHeaderWindowProc)));
  ShowWindow(cHeader, SW_SHOW);

  HWND gHeader = CreateWindowW(WC_HEADER, L"", WS_CHILD, 201, 1, 199, 24, m_rootView, nullptr, nullptr, nullptr);
  SetWindowLongPtrW(gHeader, GWLP_USERDATA, LONG_PTR(L"Group"));
  OriginalListViewProc = WNDPROC(SetWindowLongPtr(gHeader, GWLP_WNDPROC, LONG_PTR(ColHeaderWindowProc)));
  ShowWindow(gHeader, SW_SHOW);

  HWND pHeader = CreateWindowW(WC_HEADER, L"", WS_CHILD, 401, 1, 198, 24, m_rootView, nullptr, nullptr, nullptr);
  SetWindowLongPtrW(pHeader, GWLP_USERDATA, LONG_PTR(L"Page"));
  OriginalListViewProc = WNDPROC(SetWindowLongPtr(pHeader, GWLP_WNDPROC, LONG_PTR(ColHeaderWindowProc)));
  ShowWindow(pHeader, SW_SHOW);

  m_collectionAdd =
      CreateWindowW(WC_BUTTON, L"+", WS_CHILD | WS_CLIPSIBLINGS | BS_PUSHBUTTON, 1,
                    m_windowRect.bottom - m_windowRect.top - 25, 25, 24, m_rootView, nullptr, nullptr, nullptr);
  SetWindowFont(m_collectionAdd, GetStockObject(ANSI_FIXED_FONT), FALSE);
  Button_Enable(m_collectionAdd, TRUE);
  SetWindowPos(m_collectionAdd, HWND_TOP, 1, m_windowRect.bottom - m_windowRect.top - 25, 25, 24, SWP_SHOWWINDOW);

  m_collectionRemove =
      CreateWindowW(WC_BUTTON, L"-", WS_CHILD | WS_CLIPSIBLINGS | BS_PUSHBUTTON, 26,
                    m_windowRect.bottom - m_windowRect.top - 25, 25, 24, m_rootView, nullptr, nullptr, nullptr);
  SetWindowFont(m_collectionRemove, GetStockObject(ANSI_FIXED_FONT), FALSE);
  Button_Enable(m_collectionRemove, FALSE);
  SetWindowPos(m_collectionRemove, HWND_TOP, 26, m_windowRect.bottom - m_windowRect.top - 25, 25, 24, SWP_SHOWWINDOW);

  m_groupListView =
      CreateWindowW(WC_LISTVIEW, L"",
                    WS_CHILD | LVS_REPORT | LVS_SINGLESEL | LVS_SHOWSELALWAYS | LVS_NOCOLUMNHEADER | LVS_NOSORTHEADER,
                    201, 25, 199, m_windowRect.bottom - m_windowRect.top - 26, m_rootView, nullptr, nullptr, nullptr);
  column.pszText = L"Group";
  HWND header = ListView_GetHeader(m_groupListView);
  SetWindowLongPtrW(header, GWLP_USERDATA, LONG_PTR(column.pszText));
  SetWindowLongPtr(header, GWLP_WNDPROC, LONG_PTR(ColHeaderWindowProc));
  ListView_SetBkColor(m_groupListView, RGB(64, 64, 64));
  ListView_SetTextBkColor(m_groupListView, CLR_NONE);
  ListView_SetTextColor(m_groupListView, RGB(255, 255, 255));
  ListView_InsertColumn(m_groupListView, 0, &column);
  ShowWindow(m_groupListView, SW_SHOW);

  m_pageListView =
      CreateWindowW(WC_LISTVIEW, L"",
                    WS_CHILD | LVS_REPORT | LVS_SINGLESEL | LVS_SHOWSELALWAYS | LVS_NOCOLUMNHEADER | LVS_NOSORTHEADER,
                    401, 25, 198, m_windowRect.bottom - m_windowRect.top - 26, m_rootView, nullptr, nullptr, nullptr);
  column.pszText = L"Page";
  column.cx = 198 - GetSystemMetrics(SM_CXVSCROLL);
  header = ListView_GetHeader(m_pageListView);
  SetWindowLongPtrW(header, GWLP_USERDATA, LONG_PTR(column.pszText));
  SetWindowLongPtr(header, GWLP_WNDPROC, LONG_PTR(ColHeaderWindowProc));
  ListView_SetBkColor(m_pageListView, RGB(64, 64, 64));
  ListView_SetTextBkColor(m_pageListView, CLR_NONE);
  ListView_SetTextColor(m_pageListView, RGB(255, 255, 255));
  ListView_InsertColumn(m_pageListView, 0, &column);
  ShowWindow(m_pageListView, SW_SHOW);

  update();
  return true;
}

void VSTEditor::close() {
  AEffEditor::close();
  UnregisterClassW(L"VSTNotify", HINSTANCE(hInstance));
}

void VSTEditor::update() {
  m_backend.getFilePresenter().populateCollectionColumn(*this);
  m_backend.loadGroupFile(m_selCollectionIdx, m_selFileIdx);
  m_backend.getFilePresenter().populateGroupColumn(*this, m_selCollectionIdx, m_selFileIdx);
  m_backend.setGroup(m_selGroupIdx, true);
  m_backend.getFilePresenter().populatePageColumn(*this, m_selCollectionIdx, m_selFileIdx, m_selGroupIdx);
  selectPage(m_selPageIdx);
  _reselectColumns();
}

void VSTEditor::addAction() {
  std::wstring path = openDB();
  if (path.size()) {
    amuse::ContainerRegistry::Type containerType;
    std::vector<std::pair<std::wstring, amuse::IntrusiveAudioGroupData>> data =
        amuse::ContainerRegistry::LoadContainer(path.c_str(), containerType);
    if (data.empty()) {
      std::wstring msg = fmt::format(L"Unable to load Audio Groups from {}", path);
      MessageBoxW(nullptr, msg.c_str(), L"Invalid Data File", MB_OK | MB_ICONERROR);
      return;
    }

    SystemString name(amuse::ContainerRegistry::TypeToName(containerType));
    if (containerType == amuse::ContainerRegistry::Type::Raw4) {
      size_t dotpos = path.rfind(L'.');
      if (dotpos != std::string::npos)
        name.assign(path.cbegin(), path.cbegin() + dotpos);
      size_t slashpos = name.rfind(L'\\');
      size_t fslashpos = name.rfind(L'/');
      if (slashpos == std::string::npos)
        slashpos = fslashpos;
      else if (fslashpos != std::string::npos)
        slashpos = std::max(slashpos, fslashpos);
      if (slashpos != std::string::npos)
        name.assign(name.cbegin() + slashpos + 1, name.cend());
    }

    m_backend.getFilePresenter().addCollection(name, std::move(data));
    update();
  }
}

void VSTEditor::removeAction() {
  if (m_selCollectionIdx == -1)
    return;
  m_backend.getFilePresenter().removeCollection(m_selCollectionIdx);
  m_backend.getFilePresenter().populateCollectionColumn(*this);
  m_selCollectionIdx = -1;
  m_selFileIdx = -1;
  m_selGroupIdx = -1;
  m_backend.getFilePresenter().populateGroupColumn(*this, m_selCollectionIdx, m_selFileIdx);
  m_backend.getFilePresenter().populatePageColumn(*this, m_selCollectionIdx, m_selFileIdx, m_selGroupIdx);
  Button_Enable(m_collectionRemove, FALSE);
}

void VSTEditor::selectCollection(LPARAM idx) {
  if (0x80000000 & idx) {
    /* Sub-item */
    int rootIdx = (idx >> 16) & 0x7fff;
    int subIdx = idx & 0xffff;
    Button_Enable(m_collectionRemove, FALSE);
    m_selCollectionIdx = rootIdx;
    m_selFileIdx = subIdx;
    m_backend.loadGroupFile(m_selCollectionIdx, m_selFileIdx);
    m_backend.getFilePresenter().populateGroupColumn(*this, rootIdx, subIdx);
  } else {
    /* Root-item */
    int rootIdx = (idx >> 16) & 0x7fff;
    m_selCollectionIdx = rootIdx;
    Button_Enable(m_collectionRemove, TRUE);
  }
}

void VSTEditor::selectGroup(int idx) {
  m_selGroupIdx = idx;
  m_backend.setGroup(m_selGroupIdx, false);
  m_backend.getFilePresenter().populatePageColumn(*this, m_selCollectionIdx, m_selFileIdx, m_selGroupIdx);
  m_lastLParam = -1;
}

void VSTEditor::selectPage(int idx) {
  m_selPageIdx = idx;
  LV_ITEM item = {};
  item.mask = LVIF_PARAM;
  item.iItem = idx;
  ListView_GetItem(m_pageListView, &item);
  m_lastLParam = item.lParam;
  if (item.lParam & 0x80000000)
    selectDrumPage(item.lParam & 0x7fffffff);
  else
    selectNormalPage(item.lParam & 0x7fffffff);
}

void VSTEditor::reselectPage() {
  if (m_lastLParam != -1) {
    if (m_lastLParam & 0x80000000)
      m_backend._setDrumProgram(m_lastLParam & 0x7fffffff);
    else
      m_backend._setNormalProgram(m_lastLParam & 0x7fffffff);
  }
}

void VSTEditor::selectNormalPage(int idx) { m_backend.setNormalProgram(idx); }

void VSTEditor::selectDrumPage(int idx) { m_backend.setDrumProgram(idx); }
} // namespace amuse