// FbRun.cc
// Copyright (c) 2002 - 2006 Henrik Kinnunen (fluxgen at fluxbox dot org)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

#include "FbRun.hh"

#include "App.hh"
#include "EventManager.hh"
#include "Color.hh"
#include "KeyUtil.hh"
#include "FileUtil.hh"

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif // HAVE_CONFIG_H

#ifdef HAVE_XPM
#include <X11/xpm.h>
#include "fbrun.xpm"
#endif // HAVE_XPM

#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/Xutil.h>
#include <X11/cursorfont.h>
#include <unistd.h>

#include <iostream>
#include <iterator>
#include <fstream>
#include <algorithm>

using std::cerr;
using std::endl;
using std::string;
using std::fstream;
using std::ifstream;
using std::ofstream;
using std::ios;

FbRun::FbRun(int x, int y, size_t width):
    FbTk::TextBox(DefaultScreen(FbTk::App::instance()->display()),
                  m_font, ""),
    m_font("fixed"),
    m_display(FbTk::App::instance()->display()),
    m_bevel(4),
    m_gc(*this),
    m_end(false),
    m_current_history_item(0),
    m_last_completion_prefix(""),
    m_current_apps_item(0),
    m_cursor(XCreateFontCursor(FbTk::App::instance()->display(), XC_xterm)) {

    setGC(m_gc.gc());
    setCursor(m_cursor);
    // setting nomaximize in local resize
    resize(width, font().height() + m_bevel);

    // setup class name
    XClassHint *class_hint = XAllocClassHint();
    if (class_hint == 0)
        throw string("Out of memory");
    class_hint->res_name = const_cast<char *>("fbrun");
    class_hint->res_class = const_cast<char *>("FbRun");
    XSetClassHint(m_display, window(), class_hint);

    XFree(class_hint);
#ifdef HAVE_XPM
    Pixmap mask = 0;
    Pixmap pm;
    XpmCreatePixmapFromData(m_display,
                            window(),
                            const_cast<char **>(fbrun_xpm),
                            &pm,
                            &mask,
                            0); // attribs
    if (mask != 0)
        XFreePixmap(m_display, mask);

    m_pixmap = pm;
#endif // HAVE_XPM

    if (m_pixmap.drawable()) {
        XWMHints wmhints;
        wmhints.flags = IconPixmapHint;
        wmhints.icon_pixmap = m_pixmap.drawable();
        XSetWMHints(m_display, window(), &wmhints);
    }

}


FbRun::~FbRun() {
    hide();
}

void FbRun::run(const std::string &command) {
    FbTk::App::instance()->end(); // end application
    m_end = true; // mark end of processing

    // fork and execute program
    if (!fork()) {

        const char *shell = getenv("SHELL");
        if (!shell)
            shell = "/bin/sh";

        setsid();
        execl(shell, shell, "-c", command.c_str(), static_cast<void*>(NULL));
        exit(0); //exit child
    }

    hide(); // hide gui

    // save command history to file
    if (text().size() != 0) { // no need to save empty command

        // don't allow duplicates into the history file, first
        // look for a duplicate
        if (m_current_history_item < m_history.size()
            && text() == m_history[m_current_history_item]) {
            // m_current_history_item is the duplicate
        } else {
            m_current_history_item = 0;
            for (; m_current_history_item < m_history.size();
                 ++m_current_history_item) {
                if (m_history[m_current_history_item] == text())
                    break;
            }
        }

        fstream inoutfile(m_history_file.c_str(), ios::in|ios::out);
        if (inoutfile) {
            // now m_current_history_item points at the duplicate, or
            // at m_history.size() if no duplicate
            if (m_current_history_item != m_history.size()) {
                unsigned int i = 0;
                // read past history items before current
                for (; inoutfile.good() && i < m_current_history_item; i++)
                    inoutfile.ignore(1, '\n');

                // write the history items that come after current
                for (i++; i < m_history.size(); i++)
                    inoutfile<<m_history[i]<<endl;

            } else {
                // set put-pointer at end of file
                inoutfile.seekp(0, ios::end);
            }
            // append current command to the file
            inoutfile<<command<<endl;

        } else
            cerr<<"FbRun Warning: Can't write command history to file: "<<m_history_file<<endl;
    }

}

bool FbRun::loadHistory(const char *filename) {
    if (filename == 0)
        return false;
    ifstream infile(filename);
    if (!infile) {
        //even though we fail to load file, we should try save to it
        ofstream outfile(filename);
        if (outfile) {
            m_history_file = filename;
            return true;
        }
        return false;
    }
    // clear old history and load new one from file
    m_history.clear();
    // each line is a command
    string line;
    while (!infile.eof()) {
        getline(infile, line);
        if (line.size()) // don't add empty lines
            m_history.push_back(line);
    }
    // set no current histor to display
    m_current_history_item = m_history.size();
    // set history file
    m_history_file = filename;
    return true;
}

bool FbRun::loadFont(const string &fontname) {
    if (!m_font.load(fontname.c_str()))
        return false;

    // resize to fit new font height
    resize(width(), font().height() + m_bevel);
    return true;
}

void FbRun::setForegroundColor(const FbTk::Color &color) {
    m_gc.setForeground(color);
}

void FbRun::setTitle(const string &title) {
    setName(title.c_str());
}

void FbRun::resize(unsigned int width, unsigned int height) {
    FbTk::TextBox::resize(width, height);
}

void FbRun::redrawLabel() {
    clear();
}

void FbRun::keyPressEvent(XKeyEvent &ke) {
    // reset last completion prefix if we don't do a tab completion thing
    bool did_tab_complete = false;

    ke.state = FbTk::KeyUtil::instance().cleanMods(ke.state);

    FbTk::TextBox::keyPressEvent(ke);
    KeySym ks;
    char keychar[1];
    XLookupString(&ke, keychar, 1, &ks, 0);
    // a modifier key by itself doesn't do anything
    if (IsModifierKey(ks))
        return;

    if (FbTk::KeyUtil::instance().isolateModifierMask(ke.state)) { // a modifier key is down
        if ((ke.state & ControlMask) == ControlMask) {
            switch (ks) {
            case XK_p:
                did_tab_complete = true;
                prevHistoryItem();
                break;
            case XK_n:
                did_tab_complete = true;
                nextHistoryItem();
                break;
            case XK_Tab:
                did_tab_complete = true;
                tabCompleteHistory();
                break;
            }
        } else if ((ke.state & (Mod1Mask|ShiftMask)) == (Mod1Mask | ShiftMask)) {
            switch (ks) {
            case XK_less:
                did_tab_complete = true;
                firstHistoryItem();
                break;
            case XK_greater:
                did_tab_complete = true;
                lastHistoryItem();
                break;
            }
        }
    } else { // no modifier key
        switch (ks) {
        case XK_Escape:
            m_end = true;
            hide();
            FbTk::App::instance()->end(); // end program
            break;
        case XK_KP_Enter:
        case XK_Return:
            run(text());
            break;
        case XK_Up:
            prevHistoryItem();
            break;
        case XK_Down:
            nextHistoryItem();
            break;
        case XK_Tab:
            did_tab_complete = true;
            tabCompleteApps();
            break;
        }
    }
    clear();
    if (!did_tab_complete)
        m_last_completion_prefix = "";
}

void FbRun::lockPosition(bool size_too) {
    // we don't need to maximize this window
    XSizeHints sh;
    sh.flags = PMaxSize | PMinSize;
    sh.max_width = width();
    sh.max_height = height();
    sh.min_width = width();
    sh.min_height = height();
    if (size_too) {
        sh.flags |= USPosition;
        sh.x = x();
        sh.y = y();
    }
    XSetWMNormalHints(m_display, window(), &sh);
}

void FbRun::prevHistoryItem() {
    if (m_history.size() == 0 || m_current_history_item == 0) {
        XBell(m_display, 0);
    } else {
        m_current_history_item--;
        setText(m_history[m_current_history_item]);
    }
}

void FbRun::nextHistoryItem() {
    if (m_current_history_item == m_history.size()) {
        XBell(m_display, 0);
    } else {
        m_current_history_item++;
        if (m_current_history_item == m_history.size()) {
            m_current_history_item = m_history.size();
            setText("");
         } else
            setText(m_history[m_current_history_item]);
    }
}

void FbRun::firstHistoryItem() {
    if (m_history.size() == 0 || m_current_history_item == 0) {
        XBell(m_display, 0);
    } else {
        m_current_history_item = 0;
        setText(m_history[m_current_history_item]);
    }
}

void FbRun::lastHistoryItem() {
    // actually one past the end
    if (m_history.size() == 0) {
        XBell(m_display, 0);
    } else {
        m_current_history_item = m_history.size();
        setText("");
    }
}

void FbRun::tabCompleteHistory() {
    if (m_current_history_item == 0 || m_history.empty() ) {
        XBell(m_display, 0);
    } else {
        unsigned int nr= 0;
        unsigned int history_item = m_current_history_item - 1;
        if (m_last_completion_prefix.empty())
            m_last_completion_prefix = text().substr(0, textStartPos() + cursorPosition());

        while (history_item != m_current_history_item && nr++ < m_history.size()) {
            if (m_history[history_item].find(m_last_completion_prefix) == 0) {
                m_current_history_item = history_item;
                setText(m_history[m_current_history_item]);
                cursorEnd();
                break;
            }
            if (history_item == 0) // loop
                history_item = m_history.size();
            history_item--;
        }
        if (history_item == m_current_history_item) XBell(m_display, 0);
    }
}

void FbRun::tabCompleteApps() {

    static bool first_run= true;
    if (m_last_completion_prefix.empty())
        m_last_completion_prefix = text().substr(0, textStartPos() + cursorPosition());
    string prefix = m_last_completion_prefix;
    FbTk::Directory dir;

    bool add_dirs= false;
    bool changed_prefix= false;

    // (re)build m_apps-container
    if (first_run || m_last_completion_prefix != prefix) {
        first_run= false;

        string path;

        if(!prefix.empty() &&
            string("/.~").find_first_of(prefix[0]) != string::npos) {
            size_t rseparator= prefix.find_last_of("/");
            path= prefix.substr(0, rseparator + 1) +  ":";
            add_dirs= true;
        } else {
            char* tmp_path = getenv("PATH");
            if (tmp_path)
                path = tmp_path;
        }
        m_apps.clear();

        unsigned int l;
        unsigned int r;

        for(l= 0, r= 0; r < path.size(); r++) {
            if ((path[r]==':' || r == path.size() - 1) && r - l > 0) {
                string filename;
                string fncomplete;
                dir.open(path.substr(l, r - l).c_str());
                int n= dir.entries();
                if (n >= 0) {
                    while(n--) {
                        filename= dir.readFilename();
                        fncomplete= dir.name() +
                                    (*dir.name().rbegin() != '/' ? "/" : "") +
                                    filename;

                        // directories in dirmode ?
                        if (add_dirs && FbTk::FileUtil::isDirectory(fncomplete.c_str()) &&
                            filename != ".." && filename != ".") {
                            m_apps.push_back(fncomplete);
                        // executables in dirmode ?
                        } else if (add_dirs && FbTk::FileUtil::isRegularFile(fncomplete.c_str()) &&
                                   FbTk::FileUtil::isExecutable(fncomplete.c_str()) &&
                                   (prefix == "" ||
                                    fncomplete.substr(0, prefix.size()) == prefix)) {
                            m_apps.push_back(fncomplete);
                        // executables in $PATH ?
                        } else if (FbTk::FileUtil::isRegularFile(fncomplete.c_str()) &&
                                   FbTk::FileUtil::isExecutable(fncomplete.c_str()) &&
                                   (prefix == "" ||
                                    filename.substr(0, prefix.size()) == prefix)) {
                            m_apps.push_back(filename);
                        }
                    }
                }
                l= r + 1;
                dir.close();
            }
        }
        sort(m_apps.begin(), m_apps.end());
        unique(m_apps.begin(), m_apps.end());

        m_last_completion_prefix = prefix;
        changed_prefix= true;
        m_current_apps_item= 0;
    }

    if (m_apps.empty() ) {
      XBell(m_display, 0);
    } else {
        size_t apps_item = m_current_apps_item + (changed_prefix ? 0 : 1);
        bool loop= false;

        while (true) {
            if (apps_item >= m_apps.size() ) {
                loop = true;
                apps_item = 0;
            }

            if ((!changed_prefix || loop) && apps_item == m_current_apps_item) {
                break;
            }
            if (m_apps[apps_item].find(prefix) == 0) {
                m_current_apps_item = apps_item;
                if (add_dirs && FbTk::FileUtil::isDirectory(m_apps[m_current_apps_item].c_str()))
                    setText(m_apps[m_current_apps_item] +  "/");
                else
                    setText(m_apps[m_current_apps_item]);
                cursorEnd();
                break;
            }
            apps_item++;
        }
        if (!changed_prefix && apps_item == m_current_apps_item)
            XBell(m_display, 0);
    }
}

void FbRun::insertCharacter(char keychar) {
    char val[2] = {keychar, 0};
    insertText(val);
}