// Copyright (C) 2004-2022 Artifex Software, Inc.

//

// This file is part of MuPDF.

//

// MuPDF is free software: you can redistribute it and/or modify it under the

// terms of the GNU Affero General Public License as published by the Free

// Software Foundation, either version 3 of the License, or (at your option)

// any later version.

//

// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more

// details.

//

// You should have received a copy of the GNU Affero General Public License

// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>

//

// Alternative licensing terms are available from the licensor.

// For commercial licensing, see <https://www.artifex.com/> or contact

// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,

// CA 94129, USA, for further information.

#include "mupdf/fitz.h"

#include "html-imp.h"

#include <string.h>

#include <math.h>

enum { T, R, B, L };

enum { FORMAT_FB2, FORMAT_XHTML, FORMAT_HTML5, FORMAT_MOBI };

typedef struct

{

  fz_document super;

  fz_archive *zip;

  fz_html_font_set *set;

  fz_html *html;

  fz_outline *outline;

} html_document;

typedef struct

{

  fz_page super;

  html_document *doc;

  int number;

} html_page;

static void

htdoc_drop_document(fz_context *ctx, fz_document *doc_)

{

  html_document *doc = (html_document*)doc_;

  fz_drop_archive(ctx, doc->zip);

  fz_drop_html(ctx, doc->html);

  fz_drop_html_font_set(ctx, doc->set);

  fz_drop_outline(ctx, doc->outline);

}

static fz_link_dest

htdoc_resolve_link(fz_context *ctx, fz_document *doc_, const char *dest)

{

  html_document *doc = (html_document*)doc_;

  const char *s = strchr(dest, '#');

  if (s && s[1] != 0)

  {

    float y = fz_find_html_target(ctx, doc->html, s+1);

    if (y >= 0)

    {

      int page = y / doc->html->page_h;

      return fz_make_link_dest_xyz(0, page, 0, y - page * doc->html->page_h, 0);

    }

  }

  return fz_make_link_dest_none();

}

static int

htdoc_count_pages(fz_context *ctx, fz_document *doc_, int chapter)

{

  html_document *doc = (html_document*)doc_;

  if (doc->html->tree.root->s.layout.b > 0)

    return ceilf(doc->html->tree.root->s.layout.b / doc->html->page_h);

  return 1;

}

static void

htdoc_update_outline(fz_context *ctx, fz_document *doc, fz_outline *node)

{

  while (node)

  {

    fz_link_dest dest = htdoc_resolve_link(ctx, doc, node->uri);

    node->page = dest.loc;

    node->x = dest.x;

    node->y = dest.y;

    htdoc_update_outline(ctx, doc, node->down);

    node = node->next;

  }

}

static void

htdoc_layout(fz_context *ctx, fz_document *doc_, float w, float h, float em)

{

  html_document *doc = (html_document*)doc_;

  fz_layout_html(ctx, doc->html, w, h, em);

  htdoc_update_outline(ctx, doc_, doc->outline);

}

static void

htdoc_drop_page(fz_context *ctx, fz_page *page_)

{

}

static fz_rect

htdoc_bound_page(fz_context *ctx, fz_page *page_)

{

  html_page *page = (html_page*)page_;

  html_document *doc = page->doc;

  fz_rect bbox;

  bbox.x0 = 0;

  bbox.y0 = 0;

  bbox.x1 = doc->html->page_w + doc->html->page_margin[L] + doc->html->page_margin[R];

  bbox.y1 = doc->html->page_h + doc->html->page_margin[T] + doc->html->page_margin[B];

  return bbox;

}

static void

htdoc_run_page(fz_context *ctx, fz_page *page_, fz_device *dev, fz_matrix ctm, fz_cookie *cookie)

{

  html_page *page = (html_page*)page_;

  html_document *doc = page->doc;

  fz_draw_html(ctx, dev, ctm, doc->html, page->number);

}

static fz_link *

htdoc_load_links(fz_context *ctx, fz_page *page_)

{

  html_page *page = (html_page*)page_;

  html_document *doc = page->doc;

  return fz_load_html_links(ctx, doc->html, page->number, "");

}

static fz_bookmark

htdoc_make_bookmark(fz_context *ctx, fz_document *doc_, fz_location loc)

{

  html_document *doc = (html_document*)doc_;

  return fz_make_html_bookmark(ctx, doc->html, loc.page);

}

static fz_location

htdoc_lookup_bookmark(fz_context *ctx, fz_document *doc_, fz_bookmark mark)

{

  html_document *doc = (html_document*)doc_;

  return fz_make_location(0, fz_lookup_html_bookmark(ctx, doc->html, mark));

}

static fz_page *

htdoc_load_page(fz_context *ctx, fz_document *doc_, int chapter, int number)

{

  html_document *doc = (html_document*)doc_;

  html_page *page = fz_new_derived_page(ctx, html_page, doc_);

  page->super.bound_page = htdoc_bound_page;

  page->super.run_page_contents = htdoc_run_page;

  page->super.load_links = htdoc_load_links;

  page->super.drop_page = htdoc_drop_page;

  page->doc = doc;

  page->number = number;

  return (fz_page*)page;

}

static fz_outline *

htdoc_load_outline(fz_context *ctx, fz_document *doc_)

{

  html_document *doc = (html_document*)doc_;

  return fz_keep_outline(ctx, doc->outline);

}

static int

fb2doc_lookup_metadata(fz_context *ctx, fz_document *doc_, const char *key, char *buf, int size)

{

  html_document *doc = (html_document*)doc_;

  if (!strcmp(key, FZ_META_FORMAT))

    return 1 + (int)fz_strlcpy(buf, "FictionBook2", size);

  if (!strcmp(key, FZ_META_INFO_TITLE) && doc->html->title)

    return 1 + (int)fz_strlcpy(buf, doc->html->title, size);

  return -1;

}

static int

htdoc_lookup_metadata(fz_context *ctx, fz_document *doc_, const char *key, char *buf, int size)

{

  html_document *doc = (html_document*)doc_;

  if (!strcmp(key, FZ_META_FORMAT))

    return (int)fz_strlcpy(buf, "HTML5", size);

  if (!strcmp(key, FZ_META_INFO_TITLE) && doc->html->title)

    return 1 + (int)fz_strlcpy(buf, doc->html->title, size);

  return -1;

}

static int

xhtdoc_lookup_metadata(fz_context *ctx, fz_document *doc_, const char *key, char *buf, int size)

{

  html_document *doc = (html_document*)doc_;

  if (!strcmp(key, FZ_META_FORMAT))

    return (int)fz_strlcpy(buf, "XHTML", size);

  if (!strcmp(key, FZ_META_INFO_TITLE) && doc->html->title)

    return 1 + (int)fz_strlcpy(buf, doc->html->title, size);

  return -1;

}

static int

mobi_lookup_metadata(fz_context *ctx, fz_document *doc_, const char *key, char *buf, int size)

{

  html_document *doc = (html_document*)doc_;

  if (!strcmp(key, FZ_META_FORMAT))

    return (int)fz_strlcpy(buf, "MOBI", size);

  if (!strcmp(key, FZ_META_INFO_TITLE) && doc->html->title)

    return 1 + (int)fz_strlcpy(buf, doc->html->title, size);

  return -1;

}

static fz_document *

htdoc_open_document_with_buffer(fz_context *ctx, fz_archive *zip, fz_buffer *buf, int format)

{

  html_document *doc = fz_new_derived_document(ctx, html_document);

  doc->super.drop_document = htdoc_drop_document;

  doc->super.layout = htdoc_layout;

  doc->super.load_outline = htdoc_load_outline;

  doc->super.resolve_link_dest = htdoc_resolve_link;

  doc->super.make_bookmark = htdoc_make_bookmark;

  doc->super.lookup_bookmark = htdoc_lookup_bookmark;

  doc->super.count_pages = htdoc_count_pages;

  doc->super.load_page = htdoc_load_page;

  switch (format)

  {

  case FORMAT_FB2: doc->super.lookup_metadata = fb2doc_lookup_metadata; break;

  case FORMAT_HTML5: doc->super.lookup_metadata = htdoc_lookup_metadata; break;

  case FORMAT_XHTML: doc->super.lookup_metadata = xhtdoc_lookup_metadata; break;

  case FORMAT_MOBI: doc->super.lookup_metadata = mobi_lookup_metadata; break;

  }

  doc->super.is_reflowable = 1;

  fz_try(ctx)

  {

    doc->zip = zip;

    doc->set = fz_new_html_font_set(ctx);

    switch (format)

    {

    case FORMAT_FB2: doc->html = fz_parse_fb2(ctx, doc->set, doc->zip, ".", buf, fz_user_css(ctx)); break;

    case FORMAT_HTML5: doc->html = fz_parse_html5(ctx, doc->set, doc->zip, ".", buf, fz_user_css(ctx)); break;

    case FORMAT_XHTML: doc->html = fz_parse_xhtml(ctx, doc->set, doc->zip, ".", buf, fz_user_css(ctx)); break;

    case FORMAT_MOBI: doc->html = fz_parse_mobi(ctx, doc->set, doc->zip, ".", buf, fz_user_css(ctx)); break;

    }

    doc->outline = fz_load_html_outline(ctx, doc->html);

  }

  fz_always(ctx)

    fz_drop_buffer(ctx, buf);

  fz_catch(ctx)

  {

    fz_drop_document(ctx, &doc->super);

    fz_rethrow(ctx);

  }

  return (fz_document*)doc;

}

static fz_document *

htdoc_open_document_with_stream(fz_context *ctx, fz_stream *file)

{

  return htdoc_open_document_with_buffer(ctx, fz_open_directory(ctx, "."), fz_read_all(ctx, file, 0), FORMAT_HTML5);

}

static fz_document *

htdoc_open_document(fz_context *ctx, const char *filename)

{

  char dirname[2048];

  fz_dirname(dirname, filename, sizeof dirname);

  return htdoc_open_document_with_buffer(ctx, fz_open_directory(ctx, dirname), fz_read_file(ctx, filename), FORMAT_HTML5);

}

static const char *htdoc_extensions[] =

{

  "htm",

  "html",

  NULL

};

static const char *htdoc_mimetypes[] =

{

  "text/html",

  NULL

};

fz_document_handler html_document_handler =

{

  NULL,

  htdoc_open_document,

  htdoc_open_document_with_stream,

  htdoc_extensions,

  htdoc_mimetypes,

  NULL,

  NULL,

};

static fz_document *

xhtdoc_open_document_with_stream(fz_context *ctx, fz_stream *file)

{

  return htdoc_open_document_with_buffer(ctx, fz_open_directory(ctx, "."), fz_read_all(ctx, file, 0), FORMAT_XHTML);

}

static fz_document *

xhtdoc_open_document(fz_context *ctx, const char *filename)

{

  char dirname[2048];

  fz_dirname(dirname, filename, sizeof dirname);

  return htdoc_open_document_with_buffer(ctx, fz_open_directory(ctx, dirname), fz_read_file(ctx, filename), FORMAT_XHTML);

}

static const char *xhtdoc_extensions[] =

{

  "xhtml",

  NULL

};

static const char *xhtdoc_mimetypes[] =

{

  "application/xhtml+xml",

  NULL

};

fz_document_handler xhtml_document_handler =

{

  NULL,

  xhtdoc_open_document,

  xhtdoc_open_document_with_stream,

  xhtdoc_extensions,

  xhtdoc_mimetypes

};

static fz_document *

fb2doc_open_document_with_stream(fz_context *ctx, fz_stream *file)

{

  return htdoc_open_document_with_buffer(ctx, NULL, fz_read_all(ctx, file, 0), FORMAT_FB2);

}

static fz_document *

fb2doc_open_document(fz_context *ctx, const char *filename)

{

  return htdoc_open_document_with_buffer(ctx, NULL, fz_read_file(ctx, filename), FORMAT_FB2);

}

static const char *fb2doc_extensions[] =

{

  "fb2",

  "xml",

  NULL

};

static const char *fb2doc_mimetypes[] =

{

  "application/x-fictionbook",

  "application/xml",

  "text/xml",

  NULL

};

fz_document_handler fb2_document_handler =

{

  NULL,

  fb2doc_open_document,

  fb2doc_open_document_with_stream,

  fb2doc_extensions,

  fb2doc_mimetypes

};

static fz_document *

mobi_open_document_with_buffer(fz_context *ctx, fz_buffer *mobi)

{

  fz_archive *zip = NULL;

  fz_buffer *html;

  fz_var(zip);

  fz_try(ctx)

  {

    zip = fz_extract_html_from_mobi(ctx, mobi);

    html = fz_read_archive_entry(ctx, zip, "index.html");

  }

  fz_always(ctx)

  {

    fz_drop_buffer(ctx, mobi);

  }

  fz_catch(ctx)

  {

    fz_drop_archive(ctx, zip);

    fz_rethrow(ctx);

  }

  return htdoc_open_document_with_buffer(ctx, zip, html, FORMAT_MOBI);

}

static fz_document *

mobi_open_document_with_stream(fz_context *ctx, fz_stream *file)

{

  return mobi_open_document_with_buffer(ctx, fz_read_all(ctx, file, 0));

}

static fz_document *

mobi_open_document(fz_context *ctx, const char *filename)

{

  return mobi_open_document_with_buffer(ctx, fz_read_file(ctx, filename));

}

static const char *mobi_extensions[] =

{

  "mobi",

  "prc",

  "pdb",

  NULL

};

static const char *mobi_mimetypes[] =

{

  "application/x-mobipocket-ebook",

  NULL

};

fz_document_handler mobi_document_handler =

{

  NULL,

  mobi_open_document,

  mobi_open_document_with_stream,

  mobi_extensions,

  mobi_mimetypes

};