#include "CtrlLib.h"

namespace Upp {

struct KeyBinding : Moveable<KeyBinding> {
	KeyInfo    *key;
	const char *id;
	dword       def[4];
};

static VectorMap<String, Vector<KeyBinding> >& sKeys()
{
	static VectorMap<String, Vector<KeyBinding> > k;
	return k;
}

void RegisterKeyBinding(const char *group, const char *id, KeyInfo& (*info)())
{
	VectorMap<String, Vector<KeyBinding> >& keys = sKeys();
	KeyBinding& k = keys.GetAdd(group).Add();
	k.id = id;
	KeyInfo& f = (*info)();
	k.key = &f;
	memcpy(k.def, f.key, sizeof(f.key));
}

KeyInfo& AK_NULL()
{
	static KeyInfo x = { "" };
	return x;
}

void SetDefaultKeys() {
	VectorMap<String, Vector<KeyBinding> >& g = sKeys();
	for(int i = 0; i < g.GetCount(); i++) {
		Vector<KeyBinding>& k = g[i];
		for(int i = 0; i < k.GetCount(); i++) {
			KeyBinding& b = k[i];
			KeyInfo& f = *b.key;
			memcpy(f.key, b.def, sizeof(f.key));
		}
	}
}

struct KeyDisplay : Display {
	virtual void Paint(Draw& w, const Rect& r, const Value& q,
	                   Color ink, Color paper, dword flags) const {
		w.DrawRect(r, paper);
		String txt = GetKeyDesc(int(q));
		int tcy = GetTextSize(txt, StdFont()).cy;
		w.DrawText(r.left + 2, r.top + (r.Height() - tcy) / 2, txt, StdFont(), ink);
	}
};

struct KeyCtrl : Ctrl {
	int key;

	virtual void  SetData(const Value& v) { key = v; Refresh(); }
	virtual Value GetData() const         { return key; }
	virtual void  GotFocus()              { Refresh(); }
	virtual void  LostFocus()             { Refresh(); }

	virtual void  LeftDown(Point p, dword) { SetFocus(); }

	virtual void Paint(Draw& w) {
		Single<KeyDisplay>().Paint(w, GetSize(), key,
		                           HasFocus() ? SColorLight : SColorText,
		                           HasFocus() ? SColorHighlight : SColorPaper, 0);
	}

	virtual bool Key(dword _key, int) {
		if(_key == K_ENTER || _key == K_ESCAPE)
			return false;
		if((_key & K_KEYUP) || _key < 65536 || _key == K_SHIFT_KEY || _key == K_ALT_KEY || _key == K_CTRL_KEY)
			return true;
		if(_key == K_SPACE || _key == K_DELETE || _key == K_BACKSPACE)
			key = 0;
		else
			key = _key;
		UpdateActionRefresh();
		return true;
	}

	KeyCtrl() {
		Transparent();
		SetFrame(EditFieldFrame());
		key = 0;
	}
};

struct KeysDlg : WithKeysLayout<TopWindow> {
	virtual bool  Key(dword key, int);

	void EnterGroup();
	void KeyEdit();
	void Defaults();
	void CopyKeys();

	void Perform();

	typedef KeysDlg CLASSNAME;

	KeysDlg() {
		CtrlLayoutOKCancel(*this, t_("Configure keyboard shortcuts"));
		group.AddColumn(t_("Group"));
		group.WhenEnterRow = THISBACK(EnterGroup);
		group.NoGrid();
		keys.AddColumn(t_("Action"));
		keys.AddColumn(t_("Primary")).Ctrls<KeyCtrl>();
		keys.AddColumn(t_("Secondary")).Ctrls<KeyCtrl>();
		keys.SetLineCy(EditField::GetStdHeight() + 2);
		keys.NoHorzGrid().NoCursor().EvenRowColor();
		keys.ColumnWidths("182 132 133");
		keys.WhenCtrlsAction = THISBACK(KeyEdit);
		defaults <<= THISBACK(Defaults);
	}
};

bool KeysDlg::Key(dword key, int count)
{
	if(key == K_F3) { // 'hidden trick' to retrieve the document
		String qtf;
		for(int i = 0; i < sKeys().GetCount(); i++) {
			qtf << "&&&" << DeQtf(sKeys().GetKey(i)) << "&&{{1:1 ";
			const Vector<KeyBinding>& b = sKeys()[i];
			for(int i = 0; i < b.GetCount(); i++) {
				const KeyInfo& a = *b[i].key;
				const char *text = a.name;
				if(*text == '\3')
					text++;
				if(a.key[0]) {
					if(i)
						qtf << ":: ";
					qtf << DeQtf(GetKeyDesc(a.key[0]));
					if(a.key[1])
						qtf << ", " << DeQtf(GetKeyDesc(a.key[1]));
					qtf << ":: " << DeQtf(text);
				}
			}
			qtf << "}}";
		}
		WriteClipboard("QTF", qtf);
		BeepExclamation();
		return true;
	}
	return TopWindow::Key(key, count);
}

void KeysDlg::EnterGroup()
{
	keys.Clear();
	String g = group.GetKey();
	int q = sKeys().Find(g);
	if(q < 0)
		return;
	const Vector<KeyBinding>& b = sKeys()[q];
	for(int i = 0; i < b.GetCount(); i++) {
		const KeyInfo& a = *b[i].key;
		const char *text = a.name;
		if(*text == '\3')
			text = t_GetLngString(text + 1);
		keys.Add(text, (int)a.key[0], (int)a.key[1], (int)a.key[2]);
	}
	keys.GoBegin();
}

void KeysDlg::KeyEdit()
{
	String g = group.GetKey();
	int q = sKeys().Find(g);
	if(q < 0)
		return;
	for(int i = 0; i < keys.GetCount(); i++) {
		KeyInfo& a = *(sKeys()[q][i].key);
		a.key[0] = (dword)(int)keys.Get(i, 1);
		a.key[1] = (dword)(int)keys.Get(i, 2);
	}
}

void KeysDlg::Defaults()
{
	if(PromptYesNo("Restore default keys?")) {
		SetDefaultKeys();
		EnterGroup();
	}
}

void KeysDlg::Perform()
{
	String bkup = StoreKeys();
	for(int i = 0; i < sKeys().GetCount(); i++)
		group.Add(sKeys().GetKey(i));
	group.Sort();
	group.GoBegin();
	if(Run() != IDOK)
		RestoreKeys(bkup);
}

void EditKeys()
{
	KeysDlg().Perform();
}

int CharFilterNoSpace(int c)
{
	return c == ' ' ? 0 : c;
}

String StoreKeys()
{
	String out;
	const VectorMap<String, Vector<KeyBinding> >& g = sKeys();
	for(int i = 0; i < g.GetCount(); i++) {
		out << "- " << AsCString(g.GetKey(i)) << ";\r\n";
		const Vector<KeyBinding>& k = g[i];
		for(int i = 0; i < k.GetCount(); i++) {
			const KeyBinding& b = k[i];
			const KeyInfo& f = *b.key;
			for(int i = 0; i < 4; i++)
				if(f.key[i]) {
					out << Format("%-25s", b.id);
					bool b = false;
					for(int i = 0; i < 4; i++)
						if(f.key[i]) {
							if(b)
								out << ", ";
							out << ' ' << Filter(GetKeyDesc(f.key[i]), CharFilterNoSpace);
							b = true;
						}
					out << ";\r\n";
					break;
				}
		}
		out << "\r\n";
	}
	return out;
}

dword ParseKeyDesc(CParser& p)
{
	dword f = 0;
	for(;;) {
		if(p.Id("Ctrl"))
			f |= K_CTRL;
		else
		if(p.Id("Shift"))
			f |= K_SHIFT;
		else
		if(p.Id("Alt"))
			f |= K_ALT;
		else
			break;
		p.PassChar('+');
	}
	if(p.IsNumber()) {
		uint32 q = p.ReadNumber(16);
		if(q <= 9)
			return f | (K_0 + q);
		return f | q;
	}
	if(p.Char('[')) {
		int q = p.GetChar();
		p.PassChar(']');
		switch(q) {
		case '`':  return f | K_CTRL_GRAVE;
		case '-':  return f | K_CTRL_MINUS;
		case '=':  return f | K_CTRL_EQUAL;
		case '\\': return f | K_CTRL_BACKSLASH;
		case ';':  return f | K_CTRL_SEMICOLON;
		case '\'': return f | K_CTRL_APOSTROPHE;
		case ',':  return f | K_CTRL_COMMA;
		case '.':  return f | K_CTRL_PERIOD;
		case '/':  return f | K_CTRL_SLASH;
		case '[':  return f | K_CTRL_LBRACKET;
		case ']':  return f | K_CTRL_RBRACKET;
		}
		throw CParser::Error("");
	}
	String kid = p.ReadId();
	if(kid.GetLength() == 1 && *kid >= 'A' && *kid <= 'Z')
		return f | (K_A + *kid - 'A');
	if(kid.GetLength() == 2 && kid[0] == 'F' && IsDigit(kid[1]) && kid[1] != '0')
		return f | (K_F1 + (kid[1] - '1'));
	static struct {
		int key;
		const char *name;
	} nkey[] = {
		{ K_TAB, "Tab" }, { K_SPACE, "Space" }, { K_RETURN, "Enter" }, { K_BACKSPACE, "Backspace" },
		{ K_CAPSLOCK, "Caps Lock" }, { K_ESCAPE, "Esc" },
		{ K_END, "End" }, { K_HOME, "Home" },
		{ K_LEFT, "Left" }, { K_UP, "Up" }, { K_RIGHT, "Right" }, { K_DOWN, "Down" },
		{ K_INSERT, "Insert" }, { K_DELETE, "Delete" },
		{ K_ALT_KEY, "Alt" }, { K_SHIFT_KEY, "Shift" }, { K_CTRL_KEY, "Ctrl" },
		{ K_F10, "F10" }, { K_F11, "F11" }, { K_F12, "F12" }, { K_PAGEUP, "PageUp" }, { K_PAGEDOWN, "PageDown" },
		{ 0, NULL }
	};
	static VectorMap<String, int> map;
	if(map.GetCount() == 0) {
		for(int i = 0; i < __countof(nkey); i++)
			map.Add(nkey[i].name, nkey[i].key);
	}
	int q = map.Find(kid);
	if(q >= 0)
		return f | map[q];
	if(kid == "Num") {
		p.PassChar('[');
		int q = p.GetChar();
		p.PassChar(']');
		if(q == '*') return f | K_MULTIPLY;
		if(q == '+') return f | K_ADD;
		if(q == '-') return f | K_SUBTRACT;
		if(q == '/') return f | K_DIVIDE;
		throw CParser::Error("");
	}
	return f | p.ReadNumber(16);
}

void RestoreKeys(const String& data)
{
	SetDefaultKeys();
	CParser p(data);
	try {
		while(!p.IsEof()) {
			try {
				p.PassChar('-');
				String group;
				if(p.IsId())
				 	group = p.ReadId();
				else
					group = p.ReadString();
				p.PassChar(';');
				int q = sKeys().Find(group);
				if(q < 0)
					return;
				const Vector<KeyBinding>& b = sKeys()[q];
				while(!p.IsEof() && p.IsId())
					try {
						String id = p.ReadId();
						int i;
						for(i = 0; i < b.GetCount(); i++)
							if(b[i].id == id)
								break;
						int q = 0;
						do {
							dword key = ParseKeyDesc(p);
							if(i < b.GetCount() && q < 4)
								b[i].key->key[q++] = key;
						}
						while(p.Char(','));
						p.PassChar(';');
					}
					catch(CParser::Error) {
						while(!p.IsEof() && !p.Char(';'))
							p.SkipTerm();
					}
			}
			catch(CParser::Error) {
				while(!p.IsEof() && !p.Char(';'))
					p.SkipTerm();
			}
		}
	}
	catch(CParser::Error) {}
}

String GetDesc(const KeyInfo& f, bool parenthesis)
{
	return f.key[0] ? parenthesis ? "(" + GetKeyDesc(f.key[0]) + ")" : GetKeyDesc(f.key[0]) : String();
}

bool Match(const KeyInfo& k, dword key)
{
	return findarg(key, k.key[0], k.key[1], k.key[2], k.key[3]) >= 0;
}

}
