//
// PFont.cc for pekwm
// Copyright © 2003-2009 Nästén <me@pekdon.net>
//
// This program is licensed under the GNU GPL.
// See the LICENSE file for more information.
//

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

#include <iostream>
#include <cstring>

#include "PFont.hh"
#include "PScreen.hh"
#include "Util.hh"

using std::cerr;
using std::endl;
using std::string;
using std::vector;
using std::wstring;

wstring PFont::_trim_string = wstring();
const char *FALLBACK_FONT = "fixed";

// PFont

//! @brief PFont constructor
PFont::PFont(PScreen *scr) :
  _scr(scr),
  _height(0), _ascent(0), _descent(0),
  _offset_x(0), _offset_y(0), _justify(FONT_JUSTIFY_LEFT)
{
    _type = FONT_TYPE_NO;
}

//! @brief PFont destructor
PFont::~PFont(void)
{
    unload();
}

//! @brief Draws the text on the drawable.
//! @param dest destination Drawable
//! @param x x start position
//! @param y y start position
//! @param text text to draw
//! @param max_chars max nr of chars, defaults to 0 == strlen(text)
//! @param max_width max nr of pixels, defaults to 0 == infinity
//! @param trim_type how to trim title if not enough space, defaults to FONT_TRIM_END
void
PFont::draw(Drawable dest, int x, int y, const std::wstring &text,
            uint max_chars, uint max_width, PFont::TrimType trim_type)
{
    if (! text.size()) {
        return;
    }

    uint offset = x, chars = max_chars;
    wstring real_text(text);

    if (max_width > 0) {
        // If max width set, make sure text fits in max_width pixels.
        trim(real_text, trim_type, max_width);

        offset += justify(real_text, max_width, 0,
                      (chars == 0) ? real_text.size() : chars);
    } else if (chars == 0) {
        // Just set to complete string.
        chars = real_text.size();
    }

    // Draw shadowed font if x or y offset is specified
    if (_offset_x || _offset_y) {
        drawText(dest, offset + _offset_x, y + _ascent + _offset_y,
                real_text, chars, false); // false as in bg
    }

    // Draw main font
    drawText(dest, offset, y + _ascent, real_text, chars, true); // true as in fg
}

//! @brief Trims the text making it max max_width wide
//! @param text
//! @param trim_type
//! @param max_width
//! @param chars
void
PFont::trim(std::wstring &text, PFont::TrimType trim_type, uint max_width)
{
    if (getWidth(text) > max_width) {
        if ((_trim_string.size() > 0) && (trim_type == FONT_TRIM_MIDDLE)) {
            // Trim middle before end if trim string is set.
            trimMiddle(text, max_width);
        }

        trimEnd(text, max_width);
    }
}

//! @brief Figures how many charachters to have before exceding max_width
void
PFont::trimEnd(std::wstring &text, uint max_width)
{
    for (uint i = text.size(); i > 0; --i) {
        if (getWidth(text, i) <= max_width) {
            text = text.substr(0, i);
            break;
        }
    }
}

//! @brief Replace middle of string with _trim_string making it max_width wide
void
PFont::trimMiddle(std::wstring &text, uint max_width)
{
    // Get max and separator width
    uint max_side = (max_width / 2);
    uint sep_width = getWidth(_trim_string.c_str(),
                            _trim_string.size() / 2 + _trim_string.size() % 2);

    uint pos = 0;
    wstring dest;

    // If the trim string is too large, do nothing and let trimEnd handle this.
    if (max_side <= sep_width) {
        return;
    }
    // Add space for the trim string
    max_side -= sep_width;

    // Get numbers of chars before trim string (..)
    for (uint i = text.size(); i > 0; --i) {
        if (getWidth(text, i) < max_side) {
            pos = i;
            dest.insert(0, text.substr(0, i));
            break;
        }
    }
    
    // get numbers of chars after ...
    if (pos < text.size()) {
        for (uint i = pos; i < text.size(); ++i) {
            wstring second_part(text.substr(i, text.size() - i));
            if (getWidth(second_part, 0) < max_side) {
                dest.insert(dest.size(), second_part);
                break;
            }
        }

        // Got a char after and before, if not do nothing and trimEnd will handle
        // trimming after this call.
        if (dest.size() > 1) {
            if ((getWidth(dest) + getWidth(_trim_string)) < max_width) {
                dest.insert(pos, _trim_string);
            }

            // Update original string
            text = dest;
        }
    }
}

//! @brief Justifies the string based on _justify property of the Font
uint
PFont::justify(const std::wstring &text, uint max_width,
               uint padding, uint chars)
{
    uint x;
    uint width = getWidth(text, chars);

    switch(_justify) {
    case FONT_JUSTIFY_CENTER:
        x = (max_width - width) / 2;
        break;
    case FONT_JUSTIFY_RIGHT:
        x = max_width - width - padding;
        break;
    default:
        x = padding;
        break;
    }

    return x;
}

// PFontX11

//! @brief PFontX11 constructor
PFontX11::PFontX11(PScreen *scr)
    : PFont(scr),
      _font(0), _gc_fg(None), _gc_bg(None)
{
    _type = FONT_TYPE_X11;
}

//! @brief PFontX11 destructor
PFontX11::~PFontX11(void)
{
    unload();
}

//! @brief Loads the X11 font font_name
bool
PFontX11::load(const std::string &font_name)
{
    unload();

    _font = XLoadQueryFont(_scr->getDpy(), font_name.c_str());
    if (! _font) {
        _font = XLoadQueryFont(_scr->getDpy(), FALLBACK_FONT);
        if (! _font) {
            return false;
        }
    }

    _height = _font->ascent + _font->descent;
    _ascent = _font->ascent;
    _descent = _font->descent;

    // create GC's
    XGCValues gv;

    uint mask = GCFunction|GCFont;
    gv.function = GXcopy;
    gv.font = _font->fid;
    _gc_fg = XCreateGC(_scr->getDpy(), _scr->getRoot(), mask, &gv);
    _gc_bg = XCreateGC(_scr->getDpy(), _scr->getRoot(), mask, &gv);

    return true;
}

//! @brief Unloads font resources
void
PFontX11::unload(void)
{
    if (_font) {
        XFreeFont(_scr->getDpy(), _font);
        _font = 0;
    }
    if (_gc_fg != None) {
        XFreeGC(_scr->getDpy(), _gc_fg);
        _gc_fg = None;
    }
    if (_gc_bg != None) {
        XFreeGC(_scr->getDpy(), _gc_bg);
        _gc_bg = None;
    }
}

//! @brief Gets the width the text would take using this font
uint
PFontX11::getWidth(const wstring &text, uint max_chars)
{
    if (! text.size()) {
        return 0;
    }

    // Make sure the max_chars has a decent value, if it's less than 1 wich it
    // defaults to set it to the numbers of chars in the string text
    if (! max_chars || (max_chars > text.size())) {
        max_chars = text.size();
    }
  
    uint width = 0;
    if (_font) {
        // No UTF8 support, convert to locale encoding.
        string mb_text(Util::to_mb_str(text.substr(0, max_chars)));
        width = XTextWidth(_font, mb_text.c_str(), mb_text.size());
    }

    return (width + _offset_x);
}

//! @brief Draws the text on dest
//! @param dest Drawable to draw on
//! @param chars Max numbers of characthers to print
//! @param fg Bool, to use foreground or background colors
void
PFontX11::drawText(Drawable dest, int x, int y,
                   const std::wstring &text, uint chars, bool fg)
{
    GC gc = fg ? _gc_fg : _gc_bg;

    if (_font && (gc != None)) {
        string mb_text;
        if (chars != 0) {
            mb_text = Util::to_mb_str(text.substr(0, chars));
        } else {
            mb_text = Util::to_mb_str(text);
        }

        XDrawString(_scr->getDpy(), dest, gc, x, y,
                mb_text.c_str(), mb_text.size());
    }
}

//! @brief Sets the color that should be used when drawing
void
PFontX11::setColor(PFont::Color *color)
{
    if (color->hasFg()) {
        XSetForeground(_scr->getDpy(), _gc_fg, color->getFg()->pixel);
    }

    if (color->hasBg()) {
        XSetForeground(_scr->getDpy(), _gc_bg, color->getBg()->pixel);
    }
}

// PFontXmb

const char* PFontXmb::DEFAULT_FONTSET = "fixed*";

//! @brief PFontXmb constructor
PFontXmb::PFontXmb(PScreen *scr)
  : PFont(scr),
    _fontset(0), _gc_fg(None), _gc_bg(None)
{
    _type = FONT_TYPE_XMB;
}

//! @brief PFontXmb destructor
PFontXmb::~PFontXmb(void)
{
    unload();
}

//! @brief Loads Xmb font font_name
bool
PFontXmb::load(const std::string &font_name)
{
    unload();

    string basename(font_name);
    if (font_name.rfind(",*") != (font_name.size() - 2)) {
        basename.append(",*");
    }

    // Create GC
    XGCValues gv;

    uint mask = GCFunction;
    gv.function = GXcopy;
    _gc_fg = XCreateGC(_scr->getDpy(), _scr->getRoot(), mask, &gv);
    _gc_bg = XCreateGC(_scr->getDpy(), _scr->getRoot(), mask, &gv);

    // Try to load font
    char *def_string;
    char **missing_list, **font_names;
    int missing_count;

    _fontset = XCreateFontSet(_scr->getDpy(), basename.c_str(), &missing_list, &missing_count, &def_string);
    if (! _fontset) {
        cerr << "PFontXmb::load(): Failed to create fontset for " << font_name << endl;
        _fontset = XCreateFontSet(_scr->getDpy(), DEFAULT_FONTSET, &missing_list, &missing_count, &def_string);
    }

    if (_fontset) {
        for (int i = 0; i < missing_count; ++i) {
            cerr <<  "PFontXmb::load(): Missing charset" <<  missing_list[i] << endl;
        }

        _ascent = _descent = 0;

        XFontStruct **fonts;
        int fnum = XFontsOfFontSet (_fontset, &fonts, &font_names);
        for (int i = 0; i < fnum; ++i) {
            if (signed(_ascent) < fonts[i]->ascent) {
                _ascent = fonts[i]->ascent;
            }
            if (signed(_descent) < fonts[i]->descent) {
                _descent = fonts[i]->descent;
            }
        }

        _height = _ascent + _descent;

    } else {
        return false;
    }

    return true;
}

//! @brief Unloads font resources
void
PFontXmb::unload(void)
{
    if (_fontset) {
        XFreeFontSet(_scr->getDpy(), _fontset);
        _fontset = 0;
    }
}

//! @brief Gets the width the text would take using this font
uint
PFontXmb::getWidth(const std::wstring &text, uint max_chars)
{
    if (! text.size()) {
        return 0;
    }

    // Make sure the max_chars has a decent value, if it's less than 1 wich it
    // defaults to set it to the numbers of chars in the string text
    if (! max_chars || (max_chars > text.size())) {
        max_chars = text.size();
    }

    uint width = 0;
    if (_fontset) {
        XRectangle ink, logical;
        XwcTextExtents(_fontset, text.c_str(), max_chars, &ink, &logical);
        width = logical.width;
    }

    return (width + _offset_x);
}

//! @brief Draws the text on dest
//! @param dest Drawable to draw on
//! @param chars Max numbers of characthers to print
//! @param fg Bool, to use foreground or background colors
void
PFontXmb::drawText(Drawable dest, int x, int y,
                   const std::wstring &text, uint chars, bool fg)
{
    GC gc = fg ? _gc_fg : _gc_bg;

    if (_fontset && (gc != None)) {
        XwcDrawString(_scr->getDpy(), dest, _fontset, gc,
                  x, y, text.c_str(), chars ? chars : text.size());
    }
}

//! @brief Sets the color that should be used when drawing
void
PFontXmb::setColor(PFont::Color *color)
{
    if (color->hasFg()) {
        XSetForeground(_scr->getDpy(), _gc_fg, color->getFg()->pixel);
    }

    if (color->hasBg()) {
        XSetForeground(_scr->getDpy(), _gc_bg, color->getBg()->pixel);
    }
}

// PFontXft

#ifdef HAVE_XFT

//! @brief PFontXft constructor
PFontXft::PFontXft(PScreen *scr)
    : PFont(scr),
      _draw(0), _font(0), _cl_fg(0), _cl_bg(0)
{
    _type = FONT_TYPE_XFT;
    _draw = XftDrawCreate(_scr->getDpy(), _scr->getRoot(),
                          _scr->getVisual()->getXVisual(), _scr->getColormap());
}

//! @brief PFontXft destructor
PFontXft::~PFontXft(void)
{
    unload();

    XftDrawDestroy(_draw);

    if (_cl_fg) {
        XftColorFree(_scr->getDpy(), _scr->getVisual()->getXVisual(),
                     _scr->getColormap(), _cl_fg);
        delete _cl_fg;
    }
    
    if (_cl_bg) {
        XftColorFree(_scr->getDpy(), _scr->getVisual()->getXVisual(),
                     _scr->getColormap(), _cl_bg);
        delete _cl_bg;
    }
}

//! @brief Loads the Xft font font_name
bool
PFontXft::load(const std::string &font_name)
{
    unload();

    _font = XftFontOpenName(_scr->getDpy(), _scr->getScreenNum(),
                            font_name.c_str());
    if (! _font) {
        _font = XftFontOpenXlfd(_scr->getDpy(), _scr->getScreenNum(),
                                font_name.c_str());
    }

    if (_font) {
        _ascent = _font->ascent;
        _descent = _font->descent;
        _height = _font->height;

        return true;
    }
    return false;
}

//! @brief Unloads font resources
void
PFontXft::unload(void)
{
    if (_font) {
        XftFontClose(_scr->getDpy(), _font);
        _font = 0;
    }
}

//! @brief Gets the width the text would take using this font
uint
PFontXft::getWidth(const std::wstring &text, uint max_chars)
{
    if (! text.size()) {
        return 0;
    }

    // Make sure the max_chars has a decent value, if it's less than 1 wich it
    // defaults to set it to the numbers of chars in the string text
    if (! max_chars || (max_chars > text.size())) {
        max_chars = text.size();
    }

    uint width = 0;
    if (_font) {
        string utf8_text(Util::to_utf8_str(text.substr(0, max_chars)));

        XGlyphInfo extents;
        XftTextExtentsUtf8(_scr->getDpy(), _font,
                         reinterpret_cast<const XftChar8*>(utf8_text.c_str()),
                         utf8_text.size(), &extents);

        width = extents.xOff;
    }

    return (width + _offset_x);
}

//! @brief Draws the text on dest
//! @param dest Drawable to draw on
//! @param chars Max numbers of characthers to print
//! @param fg Bool, to use foreground or background colors
void
PFontXft::drawText(Drawable dest, int x, int y,
                   const std::wstring &text, uint chars, bool fg)
{
    XftColor *cl = fg ? _cl_fg : _cl_bg;

    if (_font && cl) {
        string utf8_text;
        if (chars != 0) {
            utf8_text = Util::to_utf8_str(text.substr(0, chars));
        } else {
            utf8_text = Util::to_utf8_str(text);
        }

        XftDrawChange(_draw, dest);
        XftDrawStringUtf8(_draw, cl, _font, x, y,
                          reinterpret_cast<const XftChar8*>(utf8_text.c_str()),
                          utf8_text.size());
    }
}

//! @brief Sets the color that should be used when drawing
void
PFontXft::setColor(PFont::Color *color)
{
    if (_cl_fg) {
        XftColorFree(_scr->getDpy(), _scr->getVisual()->getXVisual(),
                     _scr->getColormap(), _cl_fg);
        delete _cl_fg;
        _cl_fg = 0;
    }
    if (_cl_bg) {
        XftColorFree(_scr->getDpy(), _scr->getVisual()->getXVisual(),
                     _scr->getColormap(), _cl_bg);
        delete _cl_bg;
        _cl_bg = 0;
    }

    if (color->hasFg()) {
        _xrender_color.red = color->getFg()->red;
        _xrender_color.green = color->getFg()->green;
        _xrender_color.blue = color->getFg()->blue;
        _xrender_color.alpha = color->getFgAlpha();

        _cl_fg = new XftColor;

        XftColorAllocValue(_scr->getDpy(), _scr->getVisual()->getXVisual(),
                           _scr->getColormap(), &_xrender_color, _cl_fg);
    }

    if (color->hasBg()) {
        _xrender_color.red = color->getBg()->red;
        _xrender_color.green = color->getBg()->green;
        _xrender_color.blue = color->getBg()->blue;
        _xrender_color.alpha = color->getBgAlpha();

        _cl_bg = new XftColor;

        XftColorAllocValue(_scr->getDpy(), _scr->getVisual()->getXVisual(),
                           _scr->getColormap(), &_xrender_color, _cl_bg);
    }
}

#endif // HAVE_XFT