/**
 * \file trans.C
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Lars Gullik Bjønnes
 * \author Matthias Ettrich
 *
 * Full author contact details are available in file CREDITS.
 */

#include <config.h>

#include "trans.h"
#include "support/filetools.h"
#include "support/lstrings.h"
#include "lyxlex.h"
#include "debug.h"
#include "trans_mgr.h"

using lyx::support::contains;
using lyx::support::LibFileSearch;

using std::endl;
using std::string;
using std::map;


// KmodInfo
KmodInfo::KmodInfo()
{
}


// Trans class

Trans::Trans()
{
}


Trans::~Trans()
{
	FreeKeymap();
}


void Trans::InsertException(KmodException & exclist, char c,
			    string const & data, bool flag, tex_accent accent)
{
	Keyexc p;
	p.c = c;
	p.data = data;
	p.combined = flag;
	p.accent = accent;
	exclist.insert(exclist.begin(), p);
	// or just
	// exclist.push_back(p);
}


void Trans::FreeException(KmodException & exclist)
{
	exclist.clear();
}


void Trans::FreeKeymap()
{
	kmod_list_.clear();
	keymap_.clear();
}


bool Trans::IsDefined() const
{
	return !name_.empty();
}


string const & Trans::GetName() const
{
	return name_;
}


enum kmaptags_ {
	KCOMB = 1,
	KMOD,
	KMAP,
	KXMOD,
	K_LAST
};


struct keyword_item kmapTags[K_LAST - 1] = {
	{"\\kcomb", KCOMB },
	{ "\\kmap", KMAP },
	{ "\\kmod", KMOD },
	{ "\\kxmod", KXMOD }
};


tex_accent getkeymod(string const &);


void Trans::AddDeadkey(tex_accent accent, string const & keys)
{
	KmodInfo tmp;
	tmp.data = keys;
	tmp.accent = accent;
	kmod_list_[accent] = tmp;

	for (string::size_type i = 0; i < keys.length(); ++i) {
		string tmp;
		tmp += char(0);
		tmp += char(accent);
		keymap_[keys[i]] = tmp;
	}
}


int Trans::Load(LyXLex & lex)
{
	bool error = false;

	while (lex.isOK() && !error) {
		switch (lex.lex()) {
		case KMOD:
		{
			if (lyxerr.debugging(Debug::KBMAP))
				lyxerr << "KMOD:\t" << lex.getString() << endl;
			if (lex.next(true)) {
				if (lyxerr.debugging(Debug::KBMAP))
					lyxerr << "key\t`" << lex.getString()
					       << '\'' << endl;
			} else
				return -1;

			string const keys = lex.getString();

			if (lex.next(true)) {
				if (lyxerr.debugging(Debug::KBMAP))
					lyxerr << "accent\t`" << lex.getString()
					       << '\'' << endl;
			} else
				return -1;

			tex_accent accent = getkeymod(lex.getString());

			if (accent == TEX_NOACCENT)
				return -1;

#if 1
//#warning This code should be removed...
			// But we need to fix up all the kmap files first
			// so that this field is not present anymore.
			if (lex.next(true)) {
				if (lyxerr.debugging(Debug::KBMAP))
					lyxerr << "allowed\t`" << lex.getString()
					       << '\'' << endl;
			} else
				return -1;

			/* string const allowed = lex.getString(); */
			AddDeadkey(accent, keys /*, allowed*/);
#else
			AddDeadkey(accent, keys);
#endif
			break;
		}
		case KCOMB: {
			string str;

			lyxerr[Debug::KBMAP] << "KCOMB:" << endl;
			if (lex.next(true)) {
				str = lex.getString();
				lyxerr[Debug::KBMAP] << str << endl;
			} else
				return -1;

			tex_accent accent_1 = getkeymod(str);
			if (accent_1 == TEX_NOACCENT) return -1;

			if (lex.next(true)) {
				str = lex.getString();
				lyxerr[Debug::KBMAP] << str << endl;
			} else
				return -1;

			tex_accent accent_2= getkeymod(str);
			if (accent_2 == TEX_NOACCENT) return -1;

			map<int, KmodInfo>::iterator it1 =
				kmod_list_.find(accent_1);
			map<int, KmodInfo>::iterator it2 =
				kmod_list_.find(accent_2);
			if (it1 == kmod_list_.end()
			    || it2 == kmod_list_.end()) {
				return -1;
			}

			// Find what key accent_2 is on - should
			// check about accent_1 also
			map<int, string>::iterator it = keymap_.begin();
			map<int, string>::iterator end = keymap_.end();
			for (; it != end; ++it) {
				if (!it->second.empty()
				    && it->second[0] == 0
				    && it->second[1] == accent_2)
					break;
			}
			string allowed;
			if (lex.next()) {
				allowed = lex.getString();
				lyxerr[Debug::KBMAP] << "allowed: "
						     << allowed << endl;
			} else {
				return -1;
			}

			InsertException(kmod_list_[accent_1].exception_list,
					static_cast<char>(it->first), allowed,
					true, accent_2);
		}
		break;
		case KMAP: {
			unsigned char key_from;

			if (lyxerr.debugging(Debug::KBMAP))
				lyxerr << "KMAP:\t" << lex.getString() << endl;
			if (lex.next(true)) {
				key_from = lex.getString()[0];
				if (lyxerr.debugging(Debug::KBMAP))
					lyxerr << "\t`" << lex.getString() << '\''
					       << endl;
			} else
				return -1;

			if (lex.next(true)) {
				string const string_to = lex.getString();
				keymap_[key_from] = string_to;
				if (lyxerr.debugging(Debug::KBMAP))
					lyxerr << "\t`" << string_to << '\''
					       << endl;
			} else
				return -1;

			break;
		}
		case KXMOD: {
			tex_accent accent;
			char key;
			string str;

			if (lyxerr.debugging(Debug::KBMAP))
				lyxerr << "KXMOD:\t" << lex.getString() << endl;
			if (lex.next(true)) {
				if (lyxerr.debugging(Debug::KBMAP))
					lyxerr << "\t`" << lex.getString() << '\''
					       << endl;
				accent = getkeymod(lex.getString());
			} else
				return -1;

			if (lex.next(true)) {
				if (lyxerr.debugging(Debug::KBMAP))
					lyxerr << "\t`" << lex.getString() << '\''
					       << endl;
				key = lex.getString()[0];
			} else
				return -1;

			if (lex.next(true)) {
				if (lyxerr.debugging(Debug::KBMAP))
					lyxerr << "\t`" << lex.getString() << '\''
					       << endl;
				str = lex.getString();
			} else
				return -1;

			InsertException(kmod_list_[accent].exception_list,
					key, str);
			break;
		}
		case LyXLex::LEX_FEOF:
			lyxerr[Debug::PARSER] << "End of parsing" << endl;
			break;
		default:
			lex.printError("ParseKeymapFile: "
				       "Unknown tag: `$$Token'");
			return -1;
		}
	}
	return 0;
}


bool Trans::isAccentDefined(tex_accent accent, KmodInfo & i) const
{
	map<int, KmodInfo>::const_iterator cit = kmod_list_.find(accent);
	if (cit != kmod_list_.end()) {
		i = cit->second;
		return true;
	}
	return false;
}


string const Trans::process(char c, TransManager & k)
{
	string const t = Match(static_cast<unsigned char>(c));

	if (t.empty() && c != 0) {
		return k.normalkey(c);
	} else if (!t.empty() && t[0] != char(0)) {
		//return k.normalkey(c);
		return t;
	} else {
		return k.deadkey(c,
				 kmod_list_[static_cast<tex_accent>(t[1])]);
	}
}


int Trans::Load(string const & language)
{
	string const filename = LibFileSearch("kbd", language, "kmap");
	if (filename.empty())
		return -1;

	FreeKeymap();
	LyXLex lex(kmapTags, K_LAST - 1);
	lex.setFile(filename);

	int const res = Load(lex);

	if (res == 0) {
		name_ = language;
	} else
		name_.erase();

	return res;
}


tex_accent getkeymod(string const & p)
	/* return modifier - decoded from p and update p */
{
	for (int i = 1; i <= TEX_MAX_ACCENT; ++i) {
		if (lyxerr.debugging(Debug::KBMAP))
			lyxerr << "p = " << p
			       << ", lyx_accent_table[" << i
			       << "].name = `" << lyx_accent_table[i].name
			       << '\'' << endl;

		if (lyx_accent_table[i].name
		     && contains(p, lyx_accent_table[i].name)) {
			lyxerr[Debug::KBMAP] << "Found it!" << endl;
			return static_cast<tex_accent>(i);
		}
	}
	return TEX_NOACCENT;
}