/*======================================================================
 FILE: icalset.c
 CREATOR: eric 17 Jul 2000

 (C) COPYRIGHT 2000, Eric Busboom <eric@softwarestudio.org>

 Icalset is the "base class" for representations of a collection of
 iCal components. Derived classes (actually delegates) include:

    icalfileset   Store components in a single file
    icaldirset    Store components in multiple files in a directory
    icalheapset   Store components on the heap
    icalmysqlset  Store components in a mysql database.

 This library is free software; you can redistribute it and/or modify
 it under the terms of either:

    The LGPL as published by the Free Software Foundation, version
    2.1, available at: http://www.gnu.org/licenses/lgpl-2.1.html

 Or:

    The Mozilla Public License Version 2.0. You may obtain a copy of
    the License at http://www.mozilla.org/MPL/

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

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

#include "icalset.h"
#include "icaldirset.h"
#include "icaldirsetimpl.h"
#include "icalfileset.h"
#include "icalfilesetimpl.h"

#if defined(HAVE_BDB)
#include "icalbdbset.h"
#include "icalbdbsetimpl.h"
#endif

#include <errno.h>
#include <stdlib.h>

/* #define _DLOPEN_TEST */
#if defined(_DLOPEN_TEST)
#include <sys/types.h>
#include <dlfcn.h>
#include <dirent.h>
#endif

static icalset icalset_dirset_init = {
    ICAL_DIR_SET,
    sizeof(icaldirset),
    NULL,
    icaldirset_init,
    icaldirset_free,
    icaldirset_path,
    icaldirset_mark,
    icaldirset_commit,
    icaldirset_add_component,
    icaldirset_remove_component,
    icaldirset_count_components,
    icaldirset_select,
    icaldirset_clear,
    icaldirset_fetch,
    icaldirset_fetch_match,
    icaldirset_has_uid,
    icaldirset_modify,
    icaldirset_get_current_component,
    icaldirset_get_first_component,
    icaldirset_get_next_component,
    icaldirset_begin_component,
    icaldirsetiter_to_next,
    icaldirsetiter_to_prior
};

static icalset icalset_fileset_init = {
    ICAL_FILE_SET,
    sizeof(icalfileset),
    NULL,
    icalfileset_init,
    icalfileset_free,
    icalfileset_path,
    icalfileset_mark,
    icalfileset_commit,
    icalfileset_add_component,
    icalfileset_remove_component,
    icalfileset_count_components,
    icalfileset_select,
    icalfileset_clear,
    icalfileset_fetch,
    icalfileset_fetch_match,
    icalfileset_has_uid,
    icalfileset_modify,
    icalfileset_get_current_component,
    icalfileset_get_first_component,
    icalfileset_get_next_component,
    icalfileset_begin_component,
    icalfilesetiter_to_next,
    NULL
};

#if defined(HAVE_BDB)
static icalset icalset_bdbset_init = {
    ICAL_BDB_SET,
    sizeof(icalbdbset),
    NULL,
    icalbdbset_init,
    icalbdbset_free,
    icalbdbset_path,
    icalbdbset_mark,
    icalbdbset_commit,
    icalbdbset_add_component,
    icalbdbset_remove_component,
    icalbdbset_count_components,
    icalbdbset_select,
    icalbdbset_clear,
    icalbdbset_fetch,
    icalbdbset_fetch_match,
    icalbdbset_has_uid,
    icalbdbset_modify,
    icalbdbset_get_current_component,
    icalbdbset_get_first_component,
    icalbdbset_get_next_component,
    icalbdbset_begin_component,
    icalbdbsetiter_to_next,
    NULL
};
#endif

#if defined(_DLOPEN_TEST)
static int icalset_init_done = 0;
static pvl_list icalset_kinds = 0;

typedef icalset *(*fptr) (void);

/**
 * Try to load the file and register any icalset found within.
 */
static int load(const char *file)
{
    void *modh;
    fptr inith;
    char *dlerr;
    icalset *icalset_init_ptr;

    if ((modh = dlopen(file, RTLD_NOW)) == 0) {
        perror("dlopen");
        return 0;
    }

    (void)dlerror(); /* clear */
    inith = (fptr)dlsym(modh, "InitModule");
    dlerr = dlerror();
    if (dlerr != NULL) {
        fprintf(stderr, "dlsym error: %s\n", dlerr);
        dlclose(modh);
        return 0;
    }

    while ((icalset_init_ptr = ((inith) ())) != 0) {
        pvl_push(icalset_kinds, &icalset_init_ptr);
    }

    (void)dlerror(); /* clear */
    dlclose(modh);
    return 1;
}

/**
 * Look in the given directory for files called mod_*.o and try to
 * load them.
 */
int icalset_loaddir(const char *path)
{
    DIR *d;
    struct dirent *dp;
    char buf[PATH_MAX], *bufptr;
    int tot = 0;

    strcpy(buf, path);
    bufptr = buf + strlen(buf);

    if (*(bufptr - 1) != '/') {
        *bufptr++ = '/';
    }

    if ((d = opendir(path)) == 0) {
        perror("opendir");
        return 0;
    }

    while ((dp = readdir(d)) != 0) {
        if (strncmp(dp->d_name, "mod_", 4)) {
            continue;
        }

        strcpy(bufptr, dp->d_name);

        load(buf);
        tot++;
    }
    (void)closedir(d);

    return 1;
}

int icalset_register_class(icalset *set);

static void icalset_init(void)
{
    assert(icalset_kinds == 0);
    icalset_kinds = pvl_newlist();

    pvl_push(icalset_kinds, &icalset_fileset_init);
    pvl_push(icalset_kinds, &icalset_dirset_init);
#if defined(HAVE_BDB)
    pvl_push(icalset_kinds, &icalset_bdb4set_init);
#endif

    icalset_init_done++;
}

int icalset_register_class(icalset *set)
{
    if (!icalset_init_done) {
        icalset_init();
    }

    pvl_push(icalset_kinds, set);
    return 1;
}

#endif

icalset *icalset_new(icalset_kind kind, const char *dsn, void *options)
{
    icalset *data = NULL;
    icalset *ret = NULL;

#if defined(_DLOPEN_TEST)
    pvl_elem e;
    icalset *impl;

    if (!icalset_init_done) {
        icalset_init();
    }

    for (e = pvl_head(icalset_kinds); e != 0; e = pvl_next(e)) {
        impl = (icalset *)pvl_data(e);
        if (impl->kind == kind) {
            break;
        }
    }
    if (e == 0) {
        icalerror_set_errno(ICAL_UNIMPLEMENTED_ERROR);
        return (NULL);
    }

    data = (icalset *)malloc(impl->size);
    if (data == (icalset *)NULL) {
        icalerror_set_errno(ICAL_NEWFAILED_ERROR);
        errno = ENOMEM;
        return 0;
    }

    /* The first member of the derived class must be an icalset. */
    memset(data, 0, impl->size);
    /* *data = *impl; */
    memcpy(data, impl, sizeof(icalset));

    data->dsn = strdup(dsn);
#else
    switch (kind) {
    case ICAL_FILE_SET: {
        icalfileset *fdata;
        fdata = (icalfileset *)malloc(sizeof(icalfileset));
        data = (icalset *)fdata;
        if (data == 0) {
            icalerror_set_errno(ICAL_NEWFAILED_ERROR);
            errno = ENOMEM;
            return 0;
        }
        memset(data, 0, sizeof(icalfileset));
        *data = icalset_fileset_init;
        break;
    }
    case ICAL_DIR_SET: {
        icaldirset *ddata;
        ddata = (icaldirset *)malloc(sizeof(icaldirset));
        data = (icalset *)ddata;
        if (data == 0) {
            icalerror_set_errno(ICAL_NEWFAILED_ERROR);
            errno = ENOMEM;
            return 0;
        }
        memset(data, 0, sizeof(icaldirset));
        *data = icalset_dirset_init;
        break;
    }
#if defined(HAVE_BDB)
    case ICAL_BDB_SET: {
        icalbdbset *bdata;
        bdata = (icalbdbset *)malloc(sizeof(icalbdbset));
        data = (icalset *)bdata;
        if (data == 0) {
            icalerror_set_errno(ICAL_NEWFAILED_ERROR);
            errno = ENOMEM;
            return 0;
        }
        memset(data, 0, sizeof(icalbdbset));
        *data = icalset_bdbset_init;
        break;
    }
#endif

    default:
        icalerror_set_errno(ICAL_UNIMPLEMENTED_ERROR);
        /** unimplemented **/
        return (NULL);
    }

    data->kind = kind;
    data->dsn = strdup(dsn);
#endif

    /** call the implementation specific initializer **/
    if ((ret = data->init(data, dsn, options)) == NULL) {
        icalset_free(data);
    }

    return ret;
}

icalset *icalset_new_file(const char *path)
{
    return icalset_new(ICAL_FILE_SET, path, NULL);
}

icalset *icalset_new_file_writer(const char *path)
{
    return icalfileset_new_writer(path);
}

icalset *icalset_new_file_reader(const char *path)
{
    return icalfileset_new_reader(path);
}

icalset *icalset_new_dir(const char *path)
{
    return icalset_new(ICAL_DIR_SET, path, NULL);
}

icalset *icalset_new_dir_writer(const char *path)
{
    return icaldirset_new_writer(path);
}

icalset *icalset_new_dir_reader(const char *path)
{
    return icaldirset_new_reader(path);
}

/* Functions for built-in methods */

/**
 *  free memory associated with this icalset
 *  automatically calls the implementation specific free routine
 */

void icalset_free(icalset *set)
{
    if (set->free) {
        set->free(set);
    }

    if (set->dsn) {
        free(set->dsn);
    }

    free(set);
}

const char *icalset_path(icalset *set)
{
    return set->path(set);
}

void icalset_mark(icalset *set)
{
    set->mark(set);
}

icalerrorenum icalset_commit(icalset *set)
{
    return set->commit(set);
}

icalerrorenum icalset_add_component(icalset *set, icalcomponent *comp)
{
    return set->add_component(set, comp);
}

icalerrorenum icalset_remove_component(icalset *set, icalcomponent *comp)
{
    return set->remove_component(set, comp);
}

int icalset_count_components(icalset *set, icalcomponent_kind kind)
{
    return set->count_components(set, kind);
}

icalerrorenum icalset_select(icalset *set, icalgauge *gauge)
{
    return set->select(set, gauge);
}

void icalset_clear(icalset *set)
{
    set->clear(set);
}

icalcomponent *icalset_fetch(icalset *set, const char *uid)
{
    return set->fetch(set, 0, uid);
}

icalcomponent *icalset_fetch_match(icalset *set, icalcomponent *comp)
{
    return set->fetch_match(set, comp);
}

int icalset_has_uid(icalset *set, const char *uid)
{
    return set->has_uid(set, uid);
}

icalerrorenum icalset_modify(icalset *set, icalcomponent *old, icalcomponent *new)
{
    return set->modify(set, old, new);
}

icalcomponent *icalset_get_current_component(icalset *set)
{
    return set->get_current_component(set);
}

icalcomponent *icalset_get_first_component(icalset *set)
{
    return set->get_first_component(set);
}

icalcomponent *icalset_get_next_component(icalset *set)
{
    return set->get_next_component(set);
}

icalsetiter icalsetiter_null = { {ICAL_NO_COMPONENT, 0}
, 0, 0, 0, 0 };

icalsetiter icalset_begin_component(icalset *set,
                                    icalcomponent_kind kind, icalgauge *gauge, const char *tzid)
{
    return set->icalset_begin_component(set, kind, gauge, tzid);
}

icalcomponent *icalsetiter_next(icalsetiter *itr)
{
    icalcomponent *c = 0;

    icalerror_check_arg_rz((itr != NULL), "i");

    do {
        c = icalcompiter_next(&(itr->iter));
        if (c != 0 && (itr->gauge == 0 || icalgauge_compare(itr->gauge, c) == 1)) {
            return c;
        }
    } while (c != 0);

    return 0;
}

icalcomponent *icalsetiter_prior(icalsetiter *i)
{
    icalcomponent *c = 0;

    icalerror_check_arg_rz((i != NULL), "i");

    do {
        c = icalcompiter_prior(&(i->iter));
        if (c != 0 && (i->gauge == 0 || icalgauge_compare(i->gauge, c) == 1)) {
            return c;
        }
    } while (c != 0);

    return 0;
}

icalcomponent *icalsetiter_deref(icalsetiter *i)
{
    icalerror_check_arg_rz((i != NULL), "i");
    return (icalcompiter_deref(&(i->iter)));
}

/* for subclasses that use multiple clusters that require specialized cluster traversal */
icalcomponent *icalsetiter_to_next(icalset *set, icalsetiter *i)
{
    return set->icalsetiter_to_next(set, i);
}

icalcomponent *icalsetiter_to_prior(icalset *set, icalsetiter *i)
{
    return set->icalsetiter_to_prior(set, i);
}
