/*
    Copyright (c) 2014 Christian Schoenebeck
    
    This file is part of "gigedit" and released under the terms of the
    GNU General Public License version 2.
*/

#include "scripteditor.h"
#include "global.h"

static const std::string _keywords[] = {
    "on", "end", "declare", "while", "if", "or", "and", "not", "else", "case",
    "select", "to", "const", "polyphonic", "mod"
};
static int _keywordsSz = sizeof(_keywords) / sizeof(std::string);

static const std::string _eventNames[] = {
    "init", "note", "release", "controller"
};
static int _eventNamesSz = sizeof(_eventNames) / sizeof(std::string); 

static bool isKeyword(const Glib::ustring& s) {
    for (int i = 0; i < _keywordsSz; ++i)
        if (_keywords[i] == s) return true;
    return false;
}

static bool isEvent(const Glib::ustring& s) {
    for (int i = 0; i < _eventNamesSz; ++i)
        if (_eventNames[i] == s) return true;
    return false;
}

ScriptEditor::ScriptEditor() :
    m_applyButton(Gtk::Stock::APPLY), m_cancelButton(Gtk::Stock::CANCEL)
{
    m_script = NULL;

    add(m_vbox);

    m_tagTable = Gtk::TextBuffer::TagTable::create();
    m_keywordTag = Gtk::TextBuffer::Tag::create();
    m_keywordTag->property_weight() = PANGO_WEIGHT_BOLD;
    m_tagTable->add(m_keywordTag);
    m_eventTag = Gtk::TextBuffer::Tag::create();
    m_eventTag->property_foreground() = "blue";
    m_tagTable->add(m_eventTag);
    m_textBuffer = Gtk::TextBuffer::create(m_tagTable);
    m_textView.set_buffer(m_textBuffer);
    {
        Pango::FontDescription fdesc;
        fdesc.set_family("monospace");
        fdesc.set_size(10 * PANGO_SCALE);
#if GTKMM_MAJOR_VERSION < 3
        m_textView.modify_font(fdesc);
#else
        m_textView.override_font(fdesc);
#endif
    }
    m_scrolledWindow.add(m_textView);
    m_scrolledWindow.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
    m_vbox.pack_start(m_scrolledWindow);

    m_buttonBox.set_layout(Gtk::BUTTONBOX_END);
    m_buttonBox.pack_start(m_applyButton);
    m_buttonBox.pack_start(m_cancelButton);
    m_applyButton.set_can_default();
    m_applyButton.set_sensitive(false);
    m_applyButton.grab_focus();
    m_vbox.pack_start(m_buttonBox, Gtk::PACK_SHRINK);

    m_applyButton.signal_clicked().connect(
        sigc::mem_fun(*this, &ScriptEditor::onButtonApply)
    );

    m_cancelButton.signal_clicked().connect(
        sigc::mem_fun(*this, &ScriptEditor::onButtonCancel)
    );
    
    m_textBuffer->signal_insert().connect(
        sigc::mem_fun(*this, &ScriptEditor::onTextInserted)
    );
    
    m_textBuffer->signal_erase().connect(
        sigc::mem_fun(*this, &ScriptEditor::onTextErased)
    );
    
    m_textBuffer->signal_modified_changed().connect(
        sigc::mem_fun(*this, &ScriptEditor::onModifiedChanged)
    );
    
    signal_hide().connect(
        sigc::mem_fun(*this, &ScriptEditor::onWindowHide)
    );

    show_all_children();

    resize(460,300);
}

ScriptEditor::~ScriptEditor() {
    printf("ScriptEditor destruct\n");
}

void ScriptEditor::setScript(gig::Script* script) {
    m_script = script;
    if (!script) {
        set_title(_("No Script"));
        return;
    }

    set_title(std::string(_("Instrument Script")) + " - \"" + script->Name + "\"");
    
    std::string txt = script->GetScriptAsText();
    //printf("text : '%s'\n", txt.c_str());
    m_textBuffer->set_text(txt);
    m_textBuffer->set_modified(false);
}

void ScriptEditor::onTextInserted(const Gtk::TextBuffer::iterator& itEnd, const Glib::ustring& txt, int length) {
    printf("inserted %d\n", length);
    Gtk::TextBuffer::iterator itStart = itEnd;
    itStart.backward_chars(length);

    Gtk::TextBuffer::iterator it = itStart;
    it.backward_word_start();

    bool eofReached = false;
    while (it <= itEnd) {
        Gtk::TextBuffer::iterator itWordStart = it;
        if (!it.forward_word_end()) {
            eofReached = true;
            it = itEnd;
        }

        Glib::ustring s = m_textBuffer->get_text(itWordStart, it, false);
        printf("{%s}\n", s.c_str());
        if (isKeyword(s))
            m_textBuffer->apply_tag(m_keywordTag, itWordStart, it);
        else if (isEvent(s)) {
            // check if previous word is "on"
            Gtk::TextBuffer::iterator itPreviousWordStart = itWordStart;
            if (itPreviousWordStart.backward_word_start()) {
                Gtk::TextBuffer::iterator itPreviousWordEnd = itPreviousWordStart;
                itPreviousWordEnd.forward_word_end();
                if (m_textBuffer->get_text(itPreviousWordStart, itPreviousWordEnd, false) == "on") {
                    m_textBuffer->apply_tag(m_eventTag, itWordStart, it);
                }
            }
        }

        if (eofReached) break;

        while (!it.inside_word())
            if (!it.forward_char())
                goto EOF_REACHED;
    }
    
    EOF_REACHED:
    ;
}

void ScriptEditor::onTextErased(const Gtk::TextBuffer::iterator& itStart, const Gtk::TextBuffer::iterator& itEnd) {
    printf("erased\n");
    Gtk::TextBuffer::iterator itStart2 = itStart;
    if (itStart2.inside_word() || itStart2.ends_word())
        itStart2.backward_word_start();
    
    Gtk::TextBuffer::iterator itEnd2 = itEnd;
    if (itEnd2.inside_word()) itEnd2.forward_word_end();

    m_textBuffer->remove_all_tags(itStart2, itEnd2);
}

void ScriptEditor::onModifiedChanged() {
    m_applyButton.set_sensitive( m_textBuffer->get_modified() );
}

void ScriptEditor::onButtonCancel() {
    hide();
}

void ScriptEditor::onButtonApply() {
    m_script->SetScriptAsText(m_textBuffer->get_text());
    m_textBuffer->set_modified(false);
}

void ScriptEditor::onWindowHide() {
    delete this; // this is the end, my friend
}