/* * * * * * * *\
	GROUP.C -
		Copyright (c) 2023 Vortesys
	DESCRIPTION -
		Group window and program group/item functions.
	LICENSE INFORMATION -
		MIT License, see LICENSE.txt in the root folder
\* * * * * * * */

/* Headers */
#include "progmgr.h"
#include "group.h"
#include "resource.h"
#include "registry.h"
// #define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <CommCtrl.h>
#include <strsafe.h>

/* Variables */
WNDCLASSEX wcGrp;
WCHAR szGrpClass[16];
HWND hWndMDIClient = NULL;

/* Functions */

/* * * *\
	InitializeGroups -
		Create the MDI Client window and initialize
		the group window class.
	RETURNS -
		TRUE if groups are successfully created.
		FALSE if otherwise.
\* * * */
BOOL InitializeGroups()
{
	CLIENTCREATESTRUCT ccs = { 0 };
	WNDCLASSEX wce = { 0 };
	RECT rcFrame;

	// Create the MDI Client Window
	ccs.hWindowMenu = GetSubMenu(GetMenu(hWndProgMgr), 2);
	ccs.idFirstChild = IDM_WINDOW_CHILDSTART;

	GetClientRect(hWndProgMgr, &rcFrame);

	if (!(hWndMDIClient = CreateWindowEx(WS_EX_COMPOSITED, L"MDIClient",
		NULL, WS_CLIPCHILDREN | WS_CHILD | WS_VSCROLL | WS_HSCROLL | WS_VISIBLE,
		rcFrame.left, rcFrame.top, rcFrame.right, rcFrame.bottom,
		hWndProgMgr, (HMENU)1, hAppInstance, (LPWSTR)&ccs)))
	{
		return FALSE;
	}

	// Load the group class string
	LoadString(hAppInstance, IDS_GRPCLASS, szGrpClass, ARRAYSIZE(szGrpClass));

	// Register the group window Class
	wce.cbSize = sizeof(WNDCLASSEX);
	wce.lpfnWndProc = GroupWndProc;
	wce.cbClsExtra = 0;
	wce.cbWndExtra = 0;
	wce.hInstance = hAppInstance;
	wce.hIcon = hGroupIcon = LoadImage(hAppInstance, MAKEINTRESOURCE(IDI_PROGGRP), IMAGE_ICON,
		0, 0, LR_DEFAULTSIZE | LR_SHARED);
	wce.hCursor = LoadCursor(NULL, IDC_ARROW);
	wce.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wce.lpszMenuName = NULL;
	wce.lpszClassName = szGrpClass;

	if (!RegisterClassEx(&wce))
		return FALSE;

	// CreateGroupWindow(NULL);

	return TRUE;
}

/* * * *\
	CreateGroupWindow -
		Create an MDI window from a group structure
	RETURNS -
		Handle to the new group window
		or NULL on failure
\* * * */
HWND CreateGroupWindow(GROUP grp)
{
	MDICREATESTRUCT mcs = { NULL };
	HICON hIconLarge = NULL;
	HICON hIconSmall = NULL;
	HICON hIconTemp = NULL;
	HWND hWndGroup = NULL;
	HWND hWndListView = NULL;
	PGROUP pGroup = NULL;

	// TODO: allocate memory for the group in the array
	// of group pointers in PGARRAY, then pass this to
	// the group window in that little pointer thing :D
	// Unless... this just works a different way and I don't have to
	// keep track of all these stupid little pointers... since I can
	// just associate this with the appropriate window.
	pGroup = (PGROUP)malloc(sizeof(grp) + sizeof(ITEM) * (grp.cItemArray + 1));

	// Get group minimized/maximized flags

	mcs.szClass = szGrpClass;
	mcs.szTitle = grp.szName;
	mcs.hOwner = hAppInstance;
	if ((grp.rcGroup.left == CW_USEDEFAULT) & (grp.rcGroup.right == CW_USEDEFAULT))
	{
		mcs.x = mcs.y = mcs.cx = mcs.cy = CW_USEDEFAULT;
	}
	else
	{
		mcs.x = grp.rcGroup.left;
		mcs.y = grp.rcGroup.top;
		mcs.cx = grp.rcGroup.right - grp.rcGroup.left;
		mcs.cy = grp.rcGroup.bottom - grp.rcGroup.top;
	}
	mcs.style = WS_VISIBLE;
	mcs.lParam = (LPARAM)&grp;

	if ((hWndGroup = (HWND)SendMessage(hWndMDIClient, WM_MDICREATE, 0, (LPARAM)(LPTSTR)&mcs)) == NULL)
		return NULL;

	// Associate the group structure pointer to the group window
	SetWindowLongPtr(hWndGroup, GWLP_USERDATA, (LONG_PTR)pGroup);

	// Load the group icon
	if (ExtractIconEx(grp.szIconPath, grp.iIconIndex, &hIconLarge, &hIconSmall, 1))
	{
		if (hIconTemp = (HICON)SendMessage(hWndGroup, WM_SETICON, ICON_SMALL, (LPARAM)hIconSmall))
			DestroyIcon(hIconTemp);
		if (hIconTemp = (HICON)SendMessage(hWndGroup, WM_SETICON, ICON_BIG, (LPARAM)hIconLarge))
			DestroyIcon(hIconTemp);
	}

	// Create the group window ListView control
	if ((hWndListView = CreateWindowEx(WS_EX_LEFT, WC_LISTVIEW, L"ListView",
		WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN
		| LVS_ICON | ((LVS_AUTOARRANGE & bAutoArrange) * LVS_AUTOARRANGE) | LVS_NOSORTHEADER,
		mcs.x, mcs.y, mcs.cx, mcs.cy,
		hWndGroup, NULL, hAppInstance,
		NULL)) == NULL)
		return NULL;

	// TODO: make sure the groups delete their icons upon destruction!

	return hWndGroup;
}

/* * * *\
	RemoveGroupWindow -
		Removes and cleans up a group window
	RETURNS -
		TRUE if cleanup is successful,
		FALSE otherwise.
\* * * */
BOOL RemoveGroupWindow(HWND hWndGroup)
{
	HANDLE hGroupHeap = NULL;

	// TODO: do I handle group deletion from registry in here as well?
	// should group deletion be "abstracted" here or should i handle windows
	// and groups separately?

	return FALSE;
}


/* * * *\
	SaveGroup -
		Saves group from a group window
		into a GROUP structure.
	ABSTRACT - 
		This function will extract all of the
		necessary information from a group window
		in order to produce a group structure.
	RETURNS -
		Formatted GROUP structure.
		Upon failure, wChecksum will be 0.
\* * * */
GROUP SaveGroup(PGROUP pg)
{
	GROUP grp = {
		.dwSignature = GRP_SIGNATURE,
		.wVersion = GRP_VERSION,
		.wChecksum = 0,
		.szName = L"",
		.dwFlags = 0,
		.ftLastWrite = 0,
		.cItemArray = 0,
		.pItemArray = NULL
	};
	HWND hWndGrp = NULL;
	WCHAR szGroupName[MAX_TITLE_LENGTH];

	// Find the group and copy it
	grp = *pg;

	// Set the group checksum
	grp.wChecksum = 1; // NOTE: implement this for real later lol

	// Copy group information
	if (hWndGrp != NULL)
	{
		GetWindowText(hWndGrp, szGroupName, MAX_TITLE_LENGTH);
		StringCchCopy(grp.szName, MAX_TITLE_LENGTH, szGroupName);
	}

	grp.dwFlags = GRP_FLAG_MAXIMIZED;// GetGroupFlags(pgw);

	GetSystemTimeAsFileTime(&grp.ftLastWrite);

	// Save items...
	grp.cItemArray = 0;
	// TODO: iterate through listview to save items

	return grp;
}

/* * * *\
	GroupWndProc -
		Group window procedure.
	RETURNS -
		Zero if nothing, otherwise returns the good stuff.
\* * * */
LRESULT CALLBACK GroupWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{

	case WM_CREATE:
	{
		break;
	}

	case WM_CLOSE:
		return ShowWindow(hWnd, SW_MINIMIZE);

	default:
		return DefMDIChildProc(hWnd, message, wParam, lParam);
	}
	return 0;
}