// pdf2htmlEX.cc
//
// Copyright (C) 2012-2014 Lu Wang <coolwanglu@gmail.com>

#include <cstdio>
#include <cstdlib>
#include <cstddef>
#include <cstring>
#include <ctime>
#include <string>
#include <limits>
#include <iostream>
#include <memory>
#include <errno.h>

#include <getopt.h>

#include <poppler-config.h>
#include <goo/GooString.h>

#include <Object.h>
#include <PDFDoc.h>
#include <PDFDocFactory.h>
#include <GlobalParams.h>

#include "pdf2htmlEX-config.h"

#if ENABLE_SVG
#include <cairo.h>
#endif

#include "ArgParser.h"
#include "Param.h"
#include "HTMLRenderer/HTMLRenderer.h"

#include "util/path.h"
#include "util/ffw.h"

#ifdef __MINGW32__
#include "util/mingw.h"
#endif

using namespace std;
using namespace pdf2htmlEX;

Param param;
ArgParser argparser;

void show_usage_and_exit(const char * dummy = nullptr)
{
    cerr << "Usage: pdf2htmlEX [options] <input.pdf> [<output.html>]" << endl;
    argparser.show_usage(cerr);
    exit(EXIT_FAILURE);
}

void show_version_and_exit(const char * dummy = nullptr)
{
    cerr << "pdf2htmlEX version " << PDF2HTMLEX_VERSION << endl;
    cerr << "Copyright 2012-2014 Lu Wang <coolwanglu@gmail.com> and other contributers" << endl;
    cerr << "Libraries: " << endl;
    cerr << "  poppler " << POPPLER_VERSION << endl;
    cerr << "  libfontforge " << ffw_get_version() << endl;
#if ENABLE_SVG
    cerr << "  cairo " << cairo_version_string() << endl;
#endif
    cerr << "Default data-dir: " << param.data_dir << endl;
    cerr << "Supported image format:";
#ifdef ENABLE_LIBPNG
    cerr << " png";
#endif
#ifdef ENABLE_LIBJPEG
    cerr << " jpg";
#endif
#if ENABLE_SVG
    cerr << " svg";
#endif
    cerr << endl;

    // TODO: define constants
    if(ffw_get_version() < 20130101LL) 
    {
        cerr << endl 
             << "Warning: pdf2htmlEX has been built with a too old version of Fontforge, which is not supported." << endl;
    }
    
    cerr << endl;
    exit(EXIT_SUCCESS);
}

void embed_parser (const char * str)
{
    while(true)
    {
        switch(*str)
        {
            case '\0': return; break;
            case 'c': param.embed_css = 0; break;
            case 'C': param.embed_css = 1; break;
            case 'f': param.embed_font = 0; break;
            case 'F': param.embed_font = 1; break;
            case 'i': param.embed_image = 0; break;
            case 'I': param.embed_image = 1; break;
            case 'j': param.embed_javascript = 0; break;
            case 'J': param.embed_javascript = 1; break;
            case 'o': param.embed_outline = 0; break;
            case 'O': param.embed_outline = 1; break;
            default:
                cerr << "Unknown character `" << (*str) << "` for --embed" << endl;
                break;
        }
        ++ str;
    }
}

void prepare_directories()
{
    std::string tmp_dir = param.tmp_dir + "/pdf2htmlEX-XXXXXX";

    errno = 0;

    unique_ptr<char> pBuf(new char[tmp_dir.size() + 1]);
    strcpy(pBuf.get(), tmp_dir.c_str());
    auto p = mkdtemp(pBuf.get());
    if(p == nullptr)
    {
        const char * errmsg = strerror(errno);
        if(!errmsg)
        {
            errmsg = "unknown error";
        }
        cerr << "Cannot create temp directory: " << errmsg << endl;
        exit(EXIT_FAILURE);
    }
    param.tmp_dir = pBuf.get();
}

void parse_options (int argc, char **argv)
{
    argparser
        // pages
        .add("first-page,f", &param.first_page, 1, "first page to convert")
        .add("last-page,l", &param.last_page, numeric_limits<int>::max(), "last page to convert")

        // dimensions
        .add("zoom", &param.zoom, 0, "zoom ratio", true)
        .add("fit-width", &param.fit_width, 0, "fit width to <fp> pixels", true)
        .add("fit-height", &param.fit_height, 0, "fit height to <fp> pixels", true)
        .add("use-cropbox", &param.use_cropbox, 1, "use CropBox instead of MediaBox")
        .add("hdpi", &param.h_dpi, 144.0, "horizontal resolution for graphics in DPI")
        .add("vdpi", &param.v_dpi, 144.0, "vertical resolution for graphics in DPI")

        // output files
        .add("embed", "specify which elements should be embedded into output", embed_parser, true)
        .add("embed-css", &param.embed_css, 1, "embed CSS files into output")
        .add("embed-font", &param.embed_font, 1, "embed font files into output")
        .add("embed-image", &param.embed_image, 1, "embed image files into output")
        .add("embed-javascript", &param.embed_javascript, 1, "embed JavaScript files into output")
        .add("embed-outline", &param.embed_outline, 1, "embed outlines into output")
        .add("split-pages", &param.split_pages, 0, "split pages into separate files")
        .add("dest-dir", &param.dest_dir, ".", "specify destination directory")
        .add("css-filename", &param.css_filename, "", "filename of the generated css file")
        .add("page-filename", &param.page_filename, "", "filename template for splitted pages ")
        .add("outline-filename", &param.outline_filename, "", "filename of the generated outline file")
        .add("process-nontext", &param.process_nontext, 1, "render graphics in addition to text")
        .add("process-outline", &param.process_outline, 1, "show outline in HTML")
        .add("printing", &param.printing, 1, "enable printing support")
        .add("fallback", &param.fallback, 0, "output in fallback mode")
        .add("tmp-file-size-limit", &param.tmp_file_size_limit, -1, "Maximum size (in KB) used by temporary files, -1 for no limit.")

        // fonts
        .add("embed-external-font", &param.embed_external_font, 1, "embed local match for external fonts")
        .add("font-format", &param.font_format, "woff", "suffix for embedded font files (ttf,otf,woff,svg)")
        .add("decompose-ligature", &param.decompose_ligature, 0, "decompose ligatures, such as \uFB01 -> fi")
        .add("auto-hint", &param.auto_hint, 0, "use fontforge autohint on fonts without hints")
        .add("external-hint-tool", &param.external_hint_tool, "", "external tool for hinting fonts (overrides --auto-hint)")
        .add("stretch-narrow-glyph", &param.stretch_narrow_glyph, 0, "stretch narrow glyphs instead of padding them")
        .add("squeeze-wide-glyph", &param.squeeze_wide_glyph, 1, "shrink wide glyphs instead of truncating them")
        .add("override-fstype", &param.override_fstype, 0, "clear the fstype bits in TTF/OTF fonts")
        .add("process-type3", &param.process_type3, 0, "convert Type 3 fonts for web (experimental)")

        // text
        .add("heps", &param.h_eps, 1.0, "horizontal threshold for merging text, in pixels")
        .add("veps", &param.v_eps, 1.0, "vertical threshold for merging text, in pixels")
        .add("space-threshold", &param.space_threshold, (1.0/8), "word break threshold (threshold * em)")
        .add("font-size-multiplier", &param.font_size_multiplier, 4.0, "a value greater than 1 increases the rendering accuracy")
        .add("space-as-offset", &param.space_as_offset, 0, "treat space characters as offsets")
        .add("tounicode", &param.tounicode, 0, "how to handle ToUnicode CMaps (0=auto, 1=force, -1=ignore)")
        .add("optimize-text", &param.optimize_text, 0, "try to reduce the number of HTML elements used for text")

        // background image
        .add("bg-format", &param.bg_format, "png", "specify background image format")

        // encryption
        .add("owner-password,o", &param.owner_password, "", "owner password (for encrypted files)", true)
        .add("user-password,u", &param.user_password, "", "user password (for encrypted files)", true)
        .add("no-drm", &param.no_drm, 0, "override document DRM settings")

        // misc.
        .add("clean-tmp", &param.clean_tmp, 1, "remove temporary files after conversion")
        .add("tmp-dir", &param.tmp_dir, param.tmp_dir, "specify the location of tempory directory.")
        .add("data-dir", &param.data_dir, param.data_dir, "specify data directory")
        // TODO: css drawings are hidden on print, for annot links, need to fix it for other drawings
//        .add("css-draw", &param.css_draw, 0, "[experimental and unsupported] CSS drawing")
        .add("debug", &param.debug, 0, "print debugging information")

        // meta
        .add("version,v", "print copyright and version info", &show_version_and_exit)
        .add("help,h", "print usage information", &show_usage_and_exit)

        // deprecated

        .add("", &param.input_filename, "", "")
        .add("", &param.output_filename, "", "")
        ;

    try
    {
        argparser.parse(argc, argv);
    }
    catch(const char * s)
    {
        // if s == "", getopt_long would have printed the error message
        if(s && s[0])
        {
            cerr << "Error when parsing the arguments:" << endl;
            cerr << s << endl;
        }
        exit(EXIT_FAILURE);
    }
    catch(const std::string & s)
    {
        // if s == "", getopt_long would have printed the error message
        if(s != "")
        {
            cerr << "Error when parsing the arguments:" << endl;
            cerr << s << endl;
        }
        exit(EXIT_FAILURE);
    }
}

void check_param()
{
    if (param.input_filename == "")
    {
        show_usage_and_exit();
    }

    if(param.output_filename.empty())
    {
        const string s = get_filename(param.input_filename);
        if(get_suffix(param.input_filename) == ".pdf")
        {
            param.output_filename = s.substr(0, s.size() - 4) + ".html";

        }
        else
        {
            param.output_filename = s + ".html";
        }
    }

    if(param.page_filename.empty())
    {
        const string s = get_filename(param.input_filename);
        if(get_suffix(param.input_filename) == ".pdf")
        {
            param.page_filename = s.substr(0, s.size() - 4) + "%d.page";
        }
        else
        {
            param.page_filename = s + "%d.page";
        }
        sanitize_filename(param.page_filename);
    }

    else
    {
        // Need to make sure we have a page number placeholder in the filename
        if(!sanitize_filename(param.page_filename))
        {
            // Inject the placeholder just before the file extension
            const string suffix = get_suffix(param.page_filename);
            param.page_filename = param.page_filename.substr(0, param.page_filename.size() - suffix.size()) + "%d" + suffix;
            sanitize_filename(param.page_filename);
        }
    }
    if(param.css_filename.empty())
    {
        const string s = get_filename(param.input_filename);

        if(get_suffix(param.input_filename) == ".pdf")
        {
            param.css_filename = s.substr(0, s.size() - 4) + ".css";
        }
        else
        {
            if(!param.split_pages)
                param.css_filename = s + ".css";
        }
    }
    if(param.outline_filename.empty())
    {
        const string s = get_filename(param.input_filename);

        if(get_suffix(param.input_filename) == ".pdf")
        {
            param.outline_filename = s.substr(0, s.size() - 4) + ".outline";
        }
        else
        {
            if(!param.split_pages)
                param.outline_filename = s + ".outline";
        }
    }

    if(false) { }
#ifdef ENABLE_LIBPNG
    else if (param.bg_format == "png") { }
#endif
#ifdef ENABLE_LIBJPEG
    else if (param.bg_format == "jpg") { }
#endif
#if ENABLE_SVG
    else if(param.bg_format == "svg") { }
#endif
    else
    {
        cerr << "Image format not supported: " << param.bg_format << endl;
        exit(EXIT_FAILURE);
    }

#if not ENABLE_SVG
    if(param.process_type3)
    {
        cerr << "process-type3 is enabled, however SVG support is not built in this version of pdf2htmlEX." << endl;
        exit(EXIT_FAILURE);
    }
#endif

    if((param.font_format == "ttf") && (param.external_hint_tool == ""))
    {
        cerr << "Warning: No hint tool is specified for truetype fonts, the result may be rendered poorly in some circumstances." << endl;
    }
}

int main(int argc, char **argv)
{
    // We need to adjust these directories before parsing the options.
#if defined(__MINGW32__)
    param.data_dir = get_exec_dir(argv[0]);
    param.tmp_dir  = get_tmp_dir();
#else
    param.tmp_dir = "/tmp";
    param.data_dir = PDF2HTMLEX_DATA_PATH;
#endif

    parse_options(argc, argv);
    check_param();

    //prepare the directories
    prepare_directories();

    if(param.debug)
        cerr << "temporary dir: " << (param.tmp_dir) << endl;

    try
    {
        create_directories(param.dest_dir);
    }
    catch (const string & s)
    {
        cerr << s << endl;
        exit(EXIT_FAILURE);
    }

    bool finished = false;
    // read config file
    globalParams = new GlobalParams();
    // open PDF file
    PDFDoc * doc = nullptr;
    try
    {
        {
            GooString * ownerPW = (param.owner_password == "") ? (nullptr) : (new GooString(param.owner_password.c_str()));
            GooString * userPW = (param.user_password == "") ? (nullptr) : (new GooString(param.user_password.c_str()));
            GooString fileName(param.input_filename.c_str());

            doc = PDFDocFactory().createPDFDoc(fileName, ownerPW, userPW);

            delete userPW;
            delete ownerPW;
        }

        if (!doc->isOk())
            throw "Cannot read the file";

        // check for copy permission
        if (!doc->okToCopy())
        {
            if (param.no_drm == 0)
                throw "Copying of text from this document is not allowed.";
            cerr << "Document has copy-protection bit set." << endl;
        }

        param.first_page = min<int>(max<int>(param.first_page, 1), doc->getNumPages());
        param.last_page = min<int>(max<int>(param.last_page, param.first_page), doc->getNumPages());


        unique_ptr<HTMLRenderer>(new HTMLRenderer(param))->process(doc);

        finished = true;
    }
    catch (const char * s)
    {
        cerr << "Error: " << s << endl;
    }
    catch (const string & s)
    {
        cerr << "Error: " << s << endl;
    }

    // clean up
    delete doc;
    delete globalParams;

    // check for memory leaks
    Object::memCheck(stderr);
    gMemReport(stderr);

    exit(finished ? (EXIT_SUCCESS) : (EXIT_FAILURE));

    return 0;
}
