/*======================================================================
 FILE: icalmime.c
 CREATOR: eric 26 July 2000

 SPDX-FileCopyrightText: 2000, Eric Busboom <eric@civicknowledge.com>

 SPDX-License-Identifier: LGPL-2.1-only OR MPL-2.0

 The Original Code is eric. The Initial Developer of the Original
 Code is Eric Busboom
======================================================================*/

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

#include "icalmime.h"
#include "icalerror.h"
#include "icalmemory.h"
#include "icalparser.h"
#include "sspm.h"

#include <stdlib.h>

#define TMP_BUF_SIZE 1024
#define TMP_ERR_SIZE 256

/* These *_part routines are called by the MIME parser via the
   local_action_map */

struct text_part
{
    char *buf;
    char *buf_pos;
    size_t buf_size;
};

static void *icalmime_text_new_part(void)
{
#define BUF_SIZE 2048

    struct text_part *impl;

    if ((impl = (struct text_part *)icalmemory_new_buffer(sizeof(struct text_part))) == 0) {
        return 0;
    }

    impl->buf = icalmemory_new_buffer(BUF_SIZE);
    impl->buf_pos = impl->buf;
    impl->buf_size = BUF_SIZE;

    return impl;
}

static void icalmime_text_add_line(void *part,
                                   struct sspm_header *header, const char *line, size_t size)
{
    struct text_part *impl = (struct text_part *)part;

    _unused(header);
    _unused(size);

    icalmemory_append_string(&(impl->buf), &(impl->buf_pos), &(impl->buf_size), line);
}

static void *icalmime_textcalendar_end_part(void *part)
{
    struct text_part *impl = (struct text_part *)part;
    icalcomponent *c = icalparser_parse_string(impl->buf);

    icalmemory_free_buffer(impl->buf);
    icalmemory_free_buffer(impl);

    return c;
}

static void *icalmime_text_end_part_r(void *part)
{
    char *buf;
    struct text_part *impl = (struct text_part *)part;

    buf = impl->buf;
    icalmemory_free_buffer(impl);

    return buf;
}

void *icalmime_text_end_part(void *part)
{
    void *buf;

    buf = icalmime_text_end_part_r(part);
    icalmemory_add_tmp_buffer(buf);
    return buf;
}

static void icalmime_text_free_part(void *part)
{
    _unused(part);
}

/* Ignore Attachments for now */

static void *icalmime_attachment_new_part(void)
{
    return 0;
}

static void icalmime_attachment_add_line(void *part, struct sspm_header *header,
                                         const char *line, size_t size)
{
    _unused(part);
    _unused(header);
    _unused(line);
    _unused(size);
}

static void *icalmime_attachment_end_part(void *part)
{
    _unused(part);
    return 0;
}

static void icalmime_attachment_free_part(void *part)
{
    _unused(part);
}

static const struct sspm_action_map icalmime_local_action_map[] = {
    {SSPM_TEXT_MAJOR_TYPE, SSPM_CALENDAR_MINOR_TYPE, icalmime_text_new_part, icalmime_text_add_line,
     icalmime_textcalendar_end_part, icalmime_text_free_part},
    {SSPM_TEXT_MAJOR_TYPE, SSPM_ANY_MINOR_TYPE, icalmime_text_new_part, icalmime_text_add_line,
     icalmime_text_end_part_r, icalmime_text_free_part},
    {SSPM_TEXT_MAJOR_TYPE, SSPM_PLAIN_MINOR_TYPE, icalmime_text_new_part, icalmime_text_add_line,
     icalmime_text_end_part_r, icalmime_text_free_part},
    {SSPM_APPLICATION_MAJOR_TYPE, SSPM_CALENDAR_MINOR_TYPE, icalmime_attachment_new_part,
     icalmime_attachment_add_line, icalmime_attachment_end_part, icalmime_attachment_free_part},
    {SSPM_IMAGE_MAJOR_TYPE, SSPM_CALENDAR_MINOR_TYPE, icalmime_attachment_new_part,
     icalmime_attachment_add_line, icalmime_attachment_end_part, icalmime_attachment_free_part},
    {SSPM_AUDIO_MAJOR_TYPE, SSPM_CALENDAR_MINOR_TYPE, icalmime_attachment_new_part,
     icalmime_attachment_add_line, icalmime_attachment_end_part, icalmime_attachment_free_part},
    {SSPM_IMAGE_MAJOR_TYPE, SSPM_CALENDAR_MINOR_TYPE, icalmime_attachment_new_part,
     icalmime_attachment_add_line, icalmime_attachment_end_part, icalmime_attachment_free_part},
    {SSPM_UNKNOWN_MAJOR_TYPE, SSPM_UNKNOWN_MINOR_TYPE, NULL, NULL, NULL, NULL}
};

#define NUM_PARTS 100   /* HACK. Hard Limit */

struct sspm_part *icalmime_make_part(icalcomponent *comp)
{
    _unused(comp);
    return 0;
}

icalcomponent *icalmime_parse(char *(*get_string) (char *s, size_t size, void *d), void *data)
{
    struct sspm_part *parts;
    int i, last_level = 0;
    icalcomponent *root = 0, *parent = 0, *comp = 0, *last = 0;

    if ((parts = (struct sspm_part *)icalmemory_new_buffer(NUM_PARTS * sizeof(struct sspm_part))) == 0) {
        icalerror_set_errno(ICAL_NEWFAILED_ERROR);
        return 0;
    }

    memset(parts, 0, NUM_PARTS * sizeof(struct sspm_part));

    sspm_parse_mime(parts, NUM_PARTS, /* Max parts */
                    icalmime_local_action_map, /* Actions */
                    get_string, data, /* data for get_string */
                    0/* First header */);

    for (i = 0; i < NUM_PARTS && parts[i].header.major != SSPM_NO_MAJOR_TYPE; i++) {

        char mimetype[TMP_BUF_SIZE];
        const char *major = sspm_major_type_string(parts[i].header.major);
        const char *minor = sspm_minor_type_string(parts[i].header.minor);

        if (parts[i].header.minor == SSPM_UNKNOWN_MINOR_TYPE) {
            icalassert(parts[i].header.minor_text != 0);
            minor = parts[i].header.minor_text;
        }

        snprintf(mimetype, sizeof(mimetype), "%s/%s", major, minor);

        comp = icalcomponent_new(ICAL_XLICMIMEPART_COMPONENT);

        if (comp == 0) {
            /* HACK Handle Error */
            icalassert(0);
        }

        if (parts[i].header.error != SSPM_NO_ERROR) {
            const char *str = "Unknown error";
            char temp[TMP_ERR_SIZE];
            icalparameter *errParam;

            if (parts[i].header.error == SSPM_MALFORMED_HEADER_ERROR) {
                str = "Malformed header, possibly due to input not in MIME format";
            }

            if (parts[i].header.error == SSPM_UNEXPECTED_BOUNDARY_ERROR) {
                str = "Got an unexpected boundary, possibly due to a MIME header "
                      "for a MULTIPART part that is missing the Content-Type line";
            }

            if (parts[i].header.error == SSPM_WRONG_BOUNDARY_ERROR) {
                str = "Got the wrong boundary for the opening of a MULTIPART part.";
            }

            if (parts[i].header.error == SSPM_NO_BOUNDARY_ERROR) {
                str = "Got a multipart header that did not specify a boundary";
            }

            if (parts[i].header.error == SSPM_NO_HEADER_ERROR) {
                str = "Did not get a header for the part. Is there a blank "
                      "line between the header and the previous boundary\?";
            }

            if (parts[i].header.error_text != 0) {
                snprintf(temp, TMP_ERR_SIZE, "%s: %s", str, parts[i].header.error_text);
            } else {
                strcpy(temp, str);
            }

            errParam = icalparameter_new_xlicerrortype(ICAL_XLICERRORTYPE_MIMEPARSEERROR);
            icalcomponent_add_property(
                 comp,
                 icalproperty_vanew_xlicerror(temp, errParam, (void *)0));
            icalparameter_free(errParam);
        }

        if (parts[i].header.major != SSPM_NO_MAJOR_TYPE &&
            parts[i].header.major != SSPM_UNKNOWN_MAJOR_TYPE) {

            char *mimeTypeCopy = icalmemory_strdup(mimetype);
            icalcomponent_add_property(
                comp,
                icalproperty_new_xlicmimecontenttype(mimeTypeCopy));
            icalmemory_free_buffer(mimeTypeCopy);
        }

        if (parts[i].header.encoding != SSPM_NO_ENCODING) {

            icalcomponent_add_property(
                comp,
                icalproperty_new_xlicmimeencoding(sspm_encoding_string(parts[i].header.encoding)));
        }

        if (parts[i].header.filename != 0) {
            icalcomponent_add_property(
                comp,
                icalproperty_new_xlicmimefilename(parts[i].header.filename));
        }

        if (parts[i].header.content_id != 0) {
            icalcomponent_add_property(
                comp,
                icalproperty_new_xlicmimecid(parts[i].header.content_id));
        }

        if (parts[i].header.charset != 0) {
            icalcomponent_add_property(
                comp,
                icalproperty_new_xlicmimecharset(parts[i].header.charset));
        }

        /* Add iCal components as children of the component */
        if (parts[i].header.major == SSPM_TEXT_MAJOR_TYPE &&
            parts[i].header.minor == SSPM_CALENDAR_MINOR_TYPE && parts[i].data != 0) {

            icalcomponent_add_component(comp, (icalcomponent *) parts[i].data);
            parts[i].data = 0;

        } else if (parts[i].header.major == SSPM_TEXT_MAJOR_TYPE &&
                   parts[i].header.minor != SSPM_CALENDAR_MINOR_TYPE && parts[i].data != 0) {

            /* Add other text components as "DESCRIPTION" properties */
            char *descStr = icalmemory_strdup((char *)parts[i].data);
            icalcomponent_add_property(
                comp,
                icalproperty_new_description(descStr));
            icalmemory_free_buffer(descStr);
            parts[i].data = 0;
        }

        if (root != 0 && parts[i].level == 0) {
            /* We've already assigned the root, but there is another
               part at the root level. This is probably a parse
               error */
            icalcomponent_free(comp);
            continue;
        }

        if (parts[i].level == last_level && last_level != 0) {
            icalerror_assert(parent != 0, "No parent for adding component");

            icalcomponent_add_component(parent, comp);

        } else if (parts[i].level == last_level && last_level == 0 && root == 0) {

            root = comp;
            parent = comp;

        } else if (parts[i].level > last_level) {

            parent = last;
            icalcomponent_add_component(parent, comp);

        } else if (parts[i].level < last_level) {

            if (parent)
                parent = icalcomponent_get_parent(parent);

            icalcomponent_add_component(parent, comp);
        } else {
            icalassert(0);
        }

        last = comp;
        last_level = parts[i].level;
        icalassert(parts[i].data == 0);
    }

    sspm_free_parts(parts, NUM_PARTS);
    icalmemory_free_buffer(parts);

    return root;
}

int icalmime_test(char *(*get_string) (char *s, size_t size, void *d), void *data)
{
    char *out;
    struct sspm_part *parts;
    int i;

    if ((parts = (struct sspm_part *)icalmemory_new_buffer(NUM_PARTS * sizeof(struct sspm_part))) == 0) {
        icalerror_set_errno(ICAL_NEWFAILED_ERROR);
        return 0;
    }

    memset(parts, 0, NUM_PARTS * sizeof(struct sspm_part));

    sspm_parse_mime(parts, NUM_PARTS, /* Max parts */
                    icalmime_local_action_map, /* Actions */
                    get_string, data, /* data for get_string */
                    0/* First header */);

    for (i = 0; i < NUM_PARTS && parts[i].header.major != SSPM_NO_MAJOR_TYPE; i++) {
        if (parts[i].header.minor == SSPM_CALENDAR_MINOR_TYPE) {
            parts[i].data = icalcomponent_as_ical_string_r((icalcomponent *) parts[i].data);
        }
    }

    sspm_write_mime(parts, NUM_PARTS, &out, "To: bob@bob.org");

    printf("%s\n", out);
    icalmemory_free_buffer(out);

    return 0;
}