/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Michael Zucchi <notzed@ximian.com>
 *
 *  Copyright 2003 Ximian, Inc. (www.ximian.com)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <ctype.h>

#include <glib.h>
#include <gtk/gtk.h>
#ifdef G_OS_WIN32
/* Work around 'DATADIR' and 'interface' lossage in <windows.h> */
#define DATADIR crap_DATADIR
#include <windows.h>
#undef DATADIR
#undef interface
#endif

#include <libedataserver/e-iconv.h>
#include <libedataserver/e-data-server-util.h>  /* for e_utf8_strftime, what about e_time_format_time? */
#include <libedataserver/e-time-utils.h>
#include "e-util/e-icon-factory.h"
#include "e-util/e-util-private.h"

#include <gtkhtml/gtkhtml.h>
#include <gtkhtml/gtkhtml-embedded.h>
#include <gtkhtml/gtkhtml-stream.h>

#include <glib/gi18n.h>

#include <camel/camel-mime-message.h>
#include <camel/camel-stream.h>
#include <camel/camel-stream-filter.h>
#include <camel/camel-mime-filter.h>
#include <camel/camel-mime-filter-tohtml.h>
#include <camel/camel-mime-filter-enriched.h>
#include <camel/camel-mime-filter-basic.h>
#include <camel/camel-gpg-context.h>
#include <camel/camel-cipher-context.h>
#include <camel/camel-multipart.h>
#include <camel/camel-stream-mem.h>
#include <camel/camel-url.h>
#include <camel/camel-stream-fs.h>
#include <camel/camel-string-utils.h>
#include <camel/camel-http-stream.h>
#include <camel/camel-data-cache.h>
#include <camel/camel-file-utils.h>

#include <libedataserver/e-msgport.h>

#include "mail-component.h"
#include "mail-config.h"
#include "mail-mt.h"

#include "em-format-html.h"
#include "em-html-stream.h"
#include "em-utils.h"

#define d(x)

#define EFH_TABLE_OPEN "<table>"

struct _EMFormatHTMLCache {
    CamelMultipart *textmp;

    char partid[1];
};

struct _EMFormatHTMLPrivate {
    struct _CamelMimeMessage *last_part;    /* not reffed, DO NOT dereference */
    volatile int format_id;     /* format thread id */
    guint format_timeout_id;
    struct _format_msg *format_timeout_msg;

    /* Table that re-maps text parts into a mutlipart/mixed, EMFormatHTMLCache * */
    GHashTable *text_inline_parts;

    EDList pending_jobs;
    GMutex *lock;
};

static void efh_url_requested(GtkHTML *html, const char *url, GtkHTMLStream *handle, EMFormatHTML *efh);
static gboolean efh_object_requested(GtkHTML *html, GtkHTMLEmbedded *eb, EMFormatHTML *efh);
static void efh_gtkhtml_destroy(GtkHTML *html, EMFormatHTML *efh);

static void efh_format_message(EMFormat *emf, CamelStream *stream, CamelMimePart *part, const EMFormatHandler *info);

static void efh_format_clone(EMFormat *emf, CamelFolder *folder, const char *uid, CamelMimeMessage *msg, EMFormat *emfsource);
static void efh_format_error(EMFormat *emf, CamelStream *stream, const char *txt);
static void efh_format_source(EMFormat *, CamelStream *, CamelMimePart *);
static void efh_format_attachment(EMFormat *, CamelStream *, CamelMimePart *, const char *, const EMFormatHandler *);
static void efh_format_secure(EMFormat *emf, CamelStream *stream, CamelMimePart *part, CamelCipherValidity *valid);
static gboolean efh_busy(EMFormat *);

static void efh_builtin_init(EMFormatHTMLClass *efhc);

static void efh_write_image(EMFormat *emf, CamelStream *stream, EMFormatPURI *puri);

static EMFormatClass *efh_parent;
static CamelDataCache *emfh_http_cache;

#define EMFH_HTTP_CACHE_PATH "http"

static void
efh_init(GObject *o)
{
    EMFormatHTML *efh = (EMFormatHTML *)o;

    efh->priv = g_malloc0(sizeof(*efh->priv));

    e_dlist_init(&efh->pending_object_list);
    e_dlist_init(&efh->priv->pending_jobs);
    efh->priv->lock = g_mutex_new();
    efh->priv->format_id = -1;
    efh->priv->text_inline_parts = g_hash_table_new(g_str_hash, g_str_equal);

    efh->html = (GtkHTML *)gtk_html_new();
    gtk_html_set_blocking(efh->html, FALSE);
    g_object_ref_sink(efh->html);

    gtk_html_set_default_content_type(efh->html, "text/html; charset=utf-8");
    gtk_html_set_editable(efh->html, FALSE);
    
    g_signal_connect(efh->html, "destroy", G_CALLBACK(efh_gtkhtml_destroy), efh);
    g_signal_connect(efh->html, "url_requested", G_CALLBACK(efh_url_requested), efh);
    g_signal_connect(efh->html, "object_requested", G_CALLBACK(efh_object_requested), efh);

    efh->body_colour = 0xeeeeee;
    efh->text_colour = 0;
    efh->frame_colour = 0x3f3f3f;
    efh->content_colour = 0xffffff;
    efh->text_html_flags = CAMEL_MIME_FILTER_TOHTML_CONVERT_NL | CAMEL_MIME_FILTER_TOHTML_CONVERT_SPACES
        | CAMEL_MIME_FILTER_TOHTML_MARK_CITATION;
    efh->show_icon = TRUE;
}

static void
efh_gtkhtml_destroy(GtkHTML *html, EMFormatHTML *efh)
{
    if (efh->priv->format_timeout_id != 0) {
        g_source_remove(efh->priv->format_timeout_id);
        efh->priv->format_timeout_id = 0;
        mail_msg_free(efh->priv->format_timeout_msg);
        efh->priv->format_timeout_msg = NULL;
    }

    /* This probably works ... */
    if (efh->priv->format_id != -1)
        mail_msg_cancel(efh->priv->format_id);

    if (efh->html) {
        g_object_unref(efh->html);
        efh->html = NULL;
    }
}

static struct _EMFormatHTMLCache *
efh_insert_cache(EMFormatHTML *efh, const char *partid)
{
    struct _EMFormatHTMLCache *efhc;

    efhc = g_malloc0(sizeof(*efh) + strlen(partid));
    strcpy(efhc->partid, partid);
    g_hash_table_insert(efh->priv->text_inline_parts, efhc->partid, efhc);

    return efhc;
}


static void
efh_free_cache(void *key, void *val, void *dat)
{
    struct _EMFormatHTMLCache *efhc = val;

    if (efhc->textmp)
        camel_object_unref(efhc->textmp);
    g_free(efhc);
}

static void
efh_finalise(GObject *o)
{
    EMFormatHTML *efh = (EMFormatHTML *)o;

    /* FIXME: check for leaked stuff */

    em_format_html_clear_pobject(efh);

    efh_gtkhtml_destroy(efh->html, efh);

    g_hash_table_foreach(efh->priv->text_inline_parts, efh_free_cache, NULL);
    g_hash_table_destroy(efh->priv->text_inline_parts);

    g_free(efh->priv);

    ((GObjectClass *)efh_parent)->finalize(o);
}

static void
efh_base_init(EMFormatHTMLClass *efhklass)
{
    efh_builtin_init(efhklass);
}

static void
efh_class_init(GObjectClass *klass)
{
    ((EMFormatClass *)klass)->format_clone = efh_format_clone;
    ((EMFormatClass *)klass)->format_error = efh_format_error;
    ((EMFormatClass *)klass)->format_source = efh_format_source;
    ((EMFormatClass *)klass)->format_attachment = efh_format_attachment;
    ((EMFormatClass *)klass)->format_secure = efh_format_secure;
    ((EMFormatClass *)klass)->busy = efh_busy;
    
    klass->finalize = efh_finalise;
}

GType
em_format_html_get_type(void)
{
    static GType type = 0;

    if (type == 0) {
        static const GTypeInfo info = {
            sizeof(EMFormatHTMLClass),
            (GBaseInitFunc)efh_base_init, NULL,
            (GClassInitFunc)efh_class_init,
            NULL, NULL,
            sizeof(EMFormatHTML), 0,
            (GInstanceInitFunc)efh_init
        };
        const char *base_directory = mail_component_peek_base_directory (mail_component_peek ());
        char *path;

        efh_parent = g_type_class_ref(em_format_get_type());
        type = g_type_register_static(em_format_get_type(), "EMFormatHTML", &info, 0);

        /* cache expiry - 2 hour access, 1 day max */
        path = alloca(strlen(base_directory)+16);
        sprintf(path, "%s/cache", base_directory);
        emfh_http_cache = camel_data_cache_new(path, 0, NULL);
        if (emfh_http_cache) {
            camel_data_cache_set_expire_age(emfh_http_cache, 24*60*60);
            camel_data_cache_set_expire_access(emfh_http_cache, 2*60*60);
        }
    }

    return type;
}

EMFormatHTML *em_format_html_new(void)
{
    EMFormatHTML *efh;

    efh = g_object_new(em_format_html_get_type(), 0);

    return efh;
}

/* force loading of http images */
void em_format_html_load_http(EMFormatHTML *emfh)
{
    if (emfh->load_http == MAIL_CONFIG_HTTP_ALWAYS)
        return;

    /* This will remain set while we're still rendering the same message, then it wont be */
    emfh->load_http_now = TRUE;
    d(printf("redrawing with images forced on\n"));
    em_format_redraw((EMFormat *)emfh);
}

void
em_format_html_set_load_http(EMFormatHTML *emfh, int style)
{
    if (emfh->load_http != style) {
        emfh->load_http = style;
        em_format_redraw((EMFormat *)emfh);
    }
}

void
em_format_html_set_mark_citations(EMFormatHTML *emfh, int state, guint32 citation_colour)
{
    if (emfh->mark_citations ^ state || emfh->citation_colour != citation_colour) {
        emfh->mark_citations = state;
        emfh->citation_colour = citation_colour;
        em_format_redraw((EMFormat *)emfh);
    }
}

CamelMimePart *
em_format_html_file_part(EMFormatHTML *efh, const char *mime_type, const char *filename)
{
    CamelMimePart *part;
    CamelStream *stream;
    CamelDataWrapper *dw;
    char *basename;

    stream = camel_stream_fs_new_with_name(filename, O_RDONLY, 0);
    if (stream == NULL)
        return NULL;

    part = camel_mime_part_new();
    dw = camel_data_wrapper_new();
    camel_data_wrapper_construct_from_stream(dw, stream);
    camel_object_unref(stream);
    if (mime_type)
        camel_data_wrapper_set_mime_type(dw, mime_type);
    part = camel_mime_part_new();
    camel_medium_set_content_object((CamelMedium *)part, dw);
    camel_object_unref(dw);
    basename = g_path_get_basename (filename);
    camel_mime_part_set_filename(part, basename);
    g_free (basename);

    return part;
}

/* all this api is a pain in the bum ... */

EMFormatHTMLPObject *
em_format_html_add_pobject(EMFormatHTML *efh, size_t size, const char *classid, CamelMimePart *part, EMFormatHTMLPObjectFunc func)
{
    EMFormatHTMLPObject *pobj;

    g_assert(size >= sizeof(EMFormatHTMLPObject));

    pobj = g_malloc0(size);
    if (classid)
        pobj->classid = g_strdup(classid);
    else
        pobj->classid = g_strdup_printf("e-object:///%s", ((EMFormat *)efh)->part_id->str);

    pobj->format = efh;
    pobj->func = func;
    pobj->part = part;

    e_dlist_addtail(&efh->pending_object_list, (EDListNode *)pobj);

    return pobj;
}

EMFormatHTMLPObject *
em_format_html_find_pobject(EMFormatHTML *emf, const char *classid)
{
    EMFormatHTMLPObject *pw;

    pw = (EMFormatHTMLPObject *)emf->pending_object_list.head;
    while (pw->next) {
        if (!strcmp(pw->classid, classid))
            return pw;
        pw = pw->next;
    }

    return NULL;
}

EMFormatHTMLPObject *
em_format_html_find_pobject_func(EMFormatHTML *emf, CamelMimePart *part, EMFormatHTMLPObjectFunc func)
{
    EMFormatHTMLPObject *pw;

    pw = (EMFormatHTMLPObject *)emf->pending_object_list.head;
    while (pw->next) {
        if (pw->func == func && pw->part == part)
            return pw;
        pw = pw->next;
    }

    return NULL;
}

void
em_format_html_remove_pobject(EMFormatHTML *emf, EMFormatHTMLPObject *pobject)
{
    e_dlist_remove((EDListNode *)pobject);
    if (pobject->free)
        pobject->free(pobject);
    g_free(pobject->classid);
    g_free(pobject);
}

void
em_format_html_clear_pobject(EMFormatHTML *emf)
{
    d(printf("clearing pending objects\n"));
    while (!e_dlist_empty(&emf->pending_object_list))
        em_format_html_remove_pobject(emf, (EMFormatHTMLPObject *)emf->pending_object_list.head);
}

struct _EMFormatHTMLJob *
em_format_html_job_new(EMFormatHTML *emfh, void (*callback)(struct _EMFormatHTMLJob *job, int cancelled), void *data)
{
    struct _EMFormatHTMLJob *job = g_malloc0(sizeof(*job));

    job->format = emfh;
    job->puri_level = ((EMFormat *)emfh)->pending_uri_level;
    job->callback = callback;
    job->u.data = data;
    if (((EMFormat *)emfh)->base)
        job->base = camel_url_copy(((EMFormat *)emfh)->base);

    return job;
}

void
em_format_html_job_queue(EMFormatHTML *emfh, struct _EMFormatHTMLJob *job)
{
    g_mutex_lock(emfh->priv->lock);
    e_dlist_addtail(&emfh->priv->pending_jobs, (EDListNode *)job);
    g_mutex_unlock(emfh->priv->lock);
}

/* ********************************************************************** */

static void emfh_getpuri(struct _EMFormatHTMLJob *job, int cancelled)
{
    d(printf(" running getpuri task\n"));
    if (!cancelled)
        job->u.puri->func((EMFormat *)job->format, job->stream, job->u.puri);
}

static void emfh_gethttp(struct _EMFormatHTMLJob *job, int cancelled)
{
    CamelStream *cistream = NULL, *costream = NULL, *instream = NULL;
    CamelURL *url;
    ssize_t n, total = 0;
    char buffer[1500];

    if (cancelled
        || (url = camel_url_new(job->u.uri, NULL)) == NULL)
        goto badurl;

    d(printf(" running load uri task: %s\n", job->u.uri));

    if (emfh_http_cache)
        instream = cistream = camel_data_cache_get(emfh_http_cache, EMFH_HTTP_CACHE_PATH, job->u.uri, NULL);

    if (instream == NULL) {
        char *proxy;


        if (!(job->format->load_http_now
              || job->format->load_http == MAIL_CONFIG_HTTP_ALWAYS
              || (job->format->load_http == MAIL_CONFIG_HTTP_SOMETIMES
              && em_utils_in_addressbook((CamelInternetAddress *)camel_mime_message_get_from(job->format->format.message))))) {
            /* TODO: Ideally we would put the http requests into another queue and only send them out
               if the user selects 'load images', when they do.  The problem is how to maintain this
               state with multiple renderings, and how to adjust the thread dispatch/setup routine to handle it */
            camel_url_free(url);
            goto done;
        }

        instream = camel_http_stream_new(CAMEL_HTTP_METHOD_GET, ((EMFormat *)job->format)->session, url);
        proxy = em_utils_get_proxy_uri();
        camel_http_stream_set_proxy((CamelHttpStream *)instream, proxy);
        g_free(proxy);
        camel_operation_start(NULL, _("Retrieving `%s'"), job->u.uri);
    } else
        camel_operation_start_transient(NULL, _("Retrieving `%s'"), job->u.uri);

    camel_url_free(url);

    if (instream == NULL)
        goto done;

    if (emfh_http_cache != NULL && cistream == NULL)
        costream = camel_data_cache_add(emfh_http_cache, EMFH_HTTP_CACHE_PATH, job->u.uri, NULL);

    do {
        /* FIXME: progress reporting in percentage, can we get the length always?  do we care? */
        n = camel_stream_read(instream, buffer, sizeof (buffer));
        if (n > 0) {
            camel_operation_progress_count(NULL, total);
            total += n;
            d(printf("  read %d bytes\n", n));
            if (costream && camel_stream_write(costream, buffer, n) == -1) {
                camel_data_cache_remove(emfh_http_cache, EMFH_HTTP_CACHE_PATH, job->u.uri, NULL);
                camel_object_unref(costream);
                costream = NULL;
            }

            camel_stream_write(job->stream, buffer, n);
        } else if (n < 0 && costream) {
            camel_data_cache_remove(emfh_http_cache, EMFH_HTTP_CACHE_PATH, job->u.uri, NULL);
            camel_object_unref(costream);
            costream = NULL;            
        }
    } while (n>0);

    /* indicates success */
    if (n == 0)
        camel_stream_close(job->stream);

    if (costream)
        camel_object_unref(costream);

    camel_object_unref(instream);
done:
    camel_operation_end(NULL);
badurl:
    g_free(job->u.uri);
}

/* ********************************************************************** */

static void
efh_url_requested(GtkHTML *html, const char *url, GtkHTMLStream *handle, EMFormatHTML *efh)
{
    EMFormatPURI *puri;
    struct _EMFormatHTMLJob *job = NULL;

    d(printf("url requested, html = %p, url '%s'\n", html, url));

    puri = em_format_find_visible_puri((EMFormat *)efh, url);
    if (puri) {
        CamelDataWrapper *dw = camel_medium_get_content_object((CamelMedium *)puri->part);
        CamelContentType *ct = dw?dw->mime_type:NULL;

        /* GtkHTML only handles text and images.
           application/octet-stream parts are the only ones
           which are snooped for other content.  So only try
           to pass these to it - any other types are badly
           formed or intentionally malicious emails.  They
           will still show as attachments anyway */

        if (ct && (camel_content_type_is(ct, "text", "*")
               || camel_content_type_is(ct, "image", "*")
               || camel_content_type_is(ct, "application", "octet-stream"))) {
            puri->use_count++;

            d(printf(" adding puri job\n"));
            job = em_format_html_job_new(efh, emfh_getpuri, puri);
        } else {
            d(printf(" part is unknown type '%s', not using\n", ct?camel_content_type_format(ct):"<unset>"));
            gtk_html_stream_close(handle, GTK_HTML_STREAM_ERROR);
        }
    } else if (g_ascii_strncasecmp(url, "http:", 5) == 0 || g_ascii_strncasecmp(url, "https:", 6) == 0) {
        d(printf(" adding job, get %s\n", url));
        job = em_format_html_job_new(efh, emfh_gethttp, g_strdup(url));
    } else if  (g_ascii_strncasecmp(url, "/", 1) == 0) {
        char *data = NULL;
        guint length = 0;
        gboolean status;
        
        status = g_file_get_contents (url, &data, &length, NULL);
        if (status)
            gtk_html_stream_write (handle, data, length);

        gtk_html_stream_close(handle, status? GTK_HTML_STREAM_OK : GTK_HTML_STREAM_ERROR);
        g_free (data);
    } else {
        d(printf("HTML Includes reference to unknown uri '%s'\n", url));
        gtk_html_stream_close(handle, GTK_HTML_STREAM_ERROR);
    }

    if (job) {
        job->stream = em_html_stream_new(html, handle);
        em_format_html_job_queue(efh, job);
    }
}

static gboolean
efh_object_requested(GtkHTML *html, GtkHTMLEmbedded *eb, EMFormatHTML *efh)
{
    EMFormatHTMLPObject *pobject;
    int res = FALSE;

    if (eb->classid == NULL)
        return FALSE;

    pobject = em_format_html_find_pobject(efh, eb->classid);
    if (pobject) {
        /* This stops recursion of the part */
        e_dlist_remove((EDListNode *)pobject);
        res = pobject->func(efh, eb, pobject);
        e_dlist_addhead(&efh->pending_object_list, (EDListNode *)pobject);
    } else {
        d(printf("HTML Includes reference to unknown object '%s'\n", eb->classid));
    }

    return res;
}

/* ********************************************************************** */
#include "em-inline-filter.h"
#include <camel/camel-stream-null.h>

/* FIXME: This is duplicated in em-format-html-display, should be exported or in security module */
static const struct {
    const char *icon, *shortdesc;
} smime_sign_table[4] = {
    { "stock_signature-bad", N_("Unsigned") },
    { "stock_signature-ok", N_("Valid signature") },
    { "stock_signature-bad", N_("Invalid signature") },
    { "stock_signature", N_("Valid signature but cannot verify sender") },
};

static const struct {
    const char *icon, *shortdesc;
} smime_encrypt_table[4] = {
    { "stock_lock-broken", N_("Unencrypted") },
    { "stock_lock", N_("Encrypted, weak"),},
    { "stock_lock-ok", N_("Encrypted") },
    { "stock_lock-ok", N_("Encrypted, strong") },
};

static const char *smime_sign_colour[4] = {
    "", " bgcolor=\"#88bb88\"", " bgcolor=\"#bb8888\"", " bgcolor=\"#e8d122\""
};

/* TODO: this could probably be virtual on em-format-html
   then we only need one version of each type handler */
static void
efh_format_secure(EMFormat *emf, CamelStream *stream, CamelMimePart *part, CamelCipherValidity *valid)
{
    efh_parent->format_secure(emf, stream, part, valid);

    /* To explain, if the validity is the same, then we are the
       base validity and now have a combined sign/encrypt validity
       we can display.  Primarily a new verification context is
       created when we have an embeded message. */
    if (emf->valid == valid
        && (valid->encrypt.status != CAMEL_CIPHER_VALIDITY_ENCRYPT_NONE
        || valid->sign.status != CAMEL_CIPHER_VALIDITY_SIGN_NONE)) {
        char *classid, *iconpath;
        const char *icon;
        CamelMimePart *iconpart;
        
        camel_stream_printf (stream, "<table border=0 width=\"100%%\" cellpadding=3 cellspacing=0%s><tr>",
                     smime_sign_colour[valid->sign.status]);
        
        classid = g_strdup_printf("smime:///em-format-html/%s/icon/signed", emf->part_id->str);
        camel_stream_printf(stream, "<td valign=\"top\"><img src=\"%s\"></td><td valign=\"top\" width=\"100%%\">", classid);
        
        if (valid->sign.status != 0)
            icon = smime_sign_table[valid->sign.status].icon;
        else
            icon = smime_encrypt_table[valid->encrypt.status].icon;
        iconpath = e_icon_factory_get_icon_filename(icon, E_ICON_SIZE_DIALOG);
        iconpart = em_format_html_file_part((EMFormatHTML *)emf, "image/png", iconpath);
        if (iconpart) {
            (void)em_format_add_puri(emf, sizeof(EMFormatPURI), classid, iconpart, efh_write_image);
            camel_object_unref(iconpart);
        }
        g_free (iconpath);
        g_free(classid);

        if (valid->sign.status != CAMEL_CIPHER_VALIDITY_SIGN_NONE) {
            camel_stream_printf(stream, "%s<br>", _(smime_sign_table[valid->sign.status].shortdesc));
        }

        if (valid->encrypt.status != CAMEL_CIPHER_VALIDITY_ENCRYPT_NONE) {
            camel_stream_printf(stream, "%s<br>", _(smime_encrypt_table[valid->encrypt.status].shortdesc));
        }

        camel_stream_printf(stream, "</td></tr></table>");
    }
}
    
static void
efh_text_plain(EMFormatHTML *efh, CamelStream *stream, CamelMimePart *part, EMFormatHandler *info)
{
    CamelStreamFilter *filtered_stream;
    CamelMimeFilter *html_filter;
    CamelMultipart *mp;
    CamelDataWrapper *dw;
    CamelContentType *type;
    const char *format;
    guint32 flags;
    int i, count, len;
    struct _EMFormatHTMLCache *efhc;

    flags = efh->text_html_flags;
    
    dw = camel_medium_get_content_object((CamelMedium *)part);

    /* Check for RFC 2646 flowed text. */
    if (camel_content_type_is(dw->mime_type, "text", "plain")
        && (format = camel_content_type_param(dw->mime_type, "format"))
        && !g_ascii_strcasecmp(format, "flowed"))
        flags |= CAMEL_MIME_FILTER_TOHTML_FORMAT_FLOWED;

    /* This scans the text part for inline-encoded data, creates
       a multipart of all the parts inside it. */

    /* FIXME: We should discard this multipart if it only contains