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/* Icecast
 *
 * This program is distributed under the GNU General Public License, version 2.
 * A copy of this license is included with this source.
 *
 * Copyright 2000-2004, Jack Moffitt <jack@xiph.org, 
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
 */

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/* -*- c-basic-offset: 4; indent-tabs-mode: nil; -*- */
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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
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#include <ogg/ogg.h>
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#include <errno.h>
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#ifndef _WIN32
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#else
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#include <winsock2.h>
#include <windows.h>
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#define snprintf _snprintf
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#endif
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#include "thread/thread.h"
#include "avl/avl.h"
#include "httpp/httpp.h"
#include "net/sock.h"
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#include "connection.h"
#include "global.h"
#include "refbuf.h"
#include "client.h"
#include "stats.h"
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#include "logging.h"
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#include "cfgfile.h"
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#include "util.h"
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#include "source.h"
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#include "format.h"
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#include "auth.h"
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#undef CATMODULE
#define CATMODULE "source"

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#define MAX_FALLBACK_DEPTH 10

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mutex_t move_clients_mutex;

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/* avl tree helper */
static int _compare_clients(void *compare_arg, void *a, void *b);
static int _free_client(void *key);
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static void _parse_audio_info (source_t *source, const char *s);
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/* Allocate a new source with the stated mountpoint, if one already
 * exists with that mountpoint in the global source tree then return
 * NULL.
 */
source_t *source_reserve (const char *mount)
{
    source_t *src = NULL;

    do
    {
        avl_tree_wlock (global.source_tree);
        src = source_find_mount_raw (mount);
        if (src)
        {
            src = NULL;
            break;
        }

        src = calloc (1, sizeof(source_t));
        if (src == NULL)
            break;

        src->client_tree = avl_tree_new(_compare_clients, NULL);
        src->pending_tree = avl_tree_new(_compare_clients, NULL);

        /* make duplicates for strings or similar */
        src->mount = strdup (mount);
        src->max_listeners = -1;

        avl_insert (global.source_tree, src);

    } while (0);

    avl_tree_unlock (global.source_tree);
    return src;
}


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/* Find a mount with this raw name - ignoring fallbacks. You should have the
 * global source tree locked to call this.
 */
source_t *source_find_mount_raw(const char *mount)
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{
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    source_t *source;
    avl_node *node;
    int cmp;

    if (!mount) {
        return NULL;
    }
    /* get the root node */
    node = global.source_tree->root->right;
    
    while (node) {
        source = (source_t *)node->key;
        cmp = strcmp(mount, source->mount);
        if (cmp < 0) 
            node = node->left;
        else if (cmp > 0)
            node = node->right;
        else
            return source;
    }
    
    /* didn't find it */
    return NULL;
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}

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/* Search for mount, if the mount is there but not currently running then
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 * check the fallback, and so on.  Must have a global source lock to call
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 * this function.
 */
source_t *source_find_mount (const char *mount)
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{
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    source_t *source = NULL;
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    ice_config_t *config;
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    mount_proxy *mountinfo;
    int depth = 0;

    config = config_get_config();
    while (mount != NULL)
    {
        /* limit the number of times through, maybe infinite */
        if (depth > MAX_FALLBACK_DEPTH)
        {
            source = NULL;
            break;
        }
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        source = source_find_mount_raw(mount);
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        if (source != NULL && source->running)
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            break;
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        /* source is not running, meaning that the fallback is not configured
           within the source, we need to check the mount list */
        mountinfo = config->mounts;
        source = NULL;
        while (mountinfo)
        {
            if (strcmp (mountinfo->mountname, mount) == 0)
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                break;
            mountinfo = mountinfo->next;
        }
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        if (mountinfo)
            mount = mountinfo->fallback_mount;
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        else
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            mount = NULL;
        depth++;
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    }

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    config_release_config();
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    return source;
}


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int source_compare_sources(void *arg, void *a, void *b)
{
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    source_t *srca = (source_t *)a;
    source_t *srcb = (source_t *)b;
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    return strcmp(srca->mount, srcb->mount);
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}

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void source_clear_source (source_t *source)
{
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    refbuf_t *refbuf;
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    DEBUG1 ("clearing source \"%s\"", source->mount);
    client_destroy(source->client);
    source->client = NULL;
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    source->parser = NULL;
    source->con = NULL;
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    if (source->dumpfile)
    {
        INFO1 ("Closing dumpfile for %s", source->mount);
        fclose (source->dumpfile);
        source->dumpfile = NULL;
    }

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    /* lets kick off any clients that are left on here */
    avl_tree_rlock (source->client_tree);
    while (avl_get_first (source->client_tree))
    {
        avl_delete (source->client_tree,
                avl_get_first (source->client_tree)->key, _free_client);
    }
    avl_tree_unlock (source->client_tree);

    avl_tree_rlock (source->pending_tree);
    while (avl_get_first (source->pending_tree))
    {
        avl_delete (source->pending_tree,
                avl_get_first(source->pending_tree)->key, _free_client);
    }
    avl_tree_unlock (source->pending_tree);

    if (source->format && source->format->free_plugin)
    {
        source->format->free_plugin (source->format);
    }
    source->format = NULL;
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    if (source->yp_public)
        yp_remove (source->mount);
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    source->queue_size_limit = 0;
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    source->listeners = 0;
    source->no_mount = 0;
    source->max_listeners = -1;
    source->yp_public = 0;

    free(source->fallback_mount);
    source->fallback_mount = NULL;

    free(source->dumpfilename);
    source->dumpfilename = NULL;
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    /* Lets clear out the source queue too */
    while ((refbuf = refbuf_queue_remove(&source->queue)))
        refbuf_release(refbuf);
    source->queue = NULL;
    source->burst_on_connect = 1;
    thread_mutex_destroy(&source->queue_mutex);
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}


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/* Remove the provided source from the global tree and free it */
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void source_free_source (source_t *source)
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{
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    DEBUG1 ("freeing source \"%s\"", source->mount);
    avl_tree_wlock (global.source_tree);
    avl_delete (global.source_tree, source, NULL);
    avl_tree_unlock (global.source_tree);

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    avl_tree_free(source->pending_tree, _free_client);
    avl_tree_free(source->client_tree, _free_client);
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    free (source->mount);
    free (source);
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    return;
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}
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client_t *source_find_client(source_t *source, int id)
{
    client_t fakeclient;
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    void *result;
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    connection_t fakecon;

    fakeclient.con = &fakecon;
    fakeclient.con->id = id;

    avl_tree_rlock(source->client_tree);
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    if(avl_get_by_key(source->client_tree, &fakeclient, &result) == 0)
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    {
        avl_tree_unlock(source->client_tree);
        return result;
    }

    avl_tree_unlock(source->client_tree);
    return NULL;
}
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/* Move clients from source to dest provided dest is running
 * and that the stream format is the same.
 * The only lock that should be held when this is called is the
 * source tree lock
 */
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void source_move_clients (source_t *source, source_t *dest)
{
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    /* we don't want the two write locks to deadlock in here */
    thread_mutex_lock (&move_clients_mutex);

    /* if the destination is not running then we can't move clients */
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    if (dest->running == 0)
    {
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        WARN1 ("destination mount %s not running, unable to move clients ", dest->mount);
        thread_mutex_unlock (&move_clients_mutex);
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        return;
    }

    avl_tree_wlock (dest->pending_tree);
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    do
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    {
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        client_t *client;
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        /* we need to move the client and pending trees */
        avl_tree_wlock (source->pending_tree);
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        if (source->format == NULL)
        {
            INFO1 ("source mount %s is not available", source->mount);
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            break;
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        }
        if (source->format->type != dest->format->type)
        {
            WARN2 ("stream %s and %s are of different types, ignored", source->mount, dest->mount);
            break;
        }
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        while (1)
        {
            avl_node *node = avl_get_first (source->pending_tree);
            if (node == NULL)
                break;
            client = (client_t *)(node->key);
            avl_delete (source->pending_tree, client, NULL);
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            /* TODO: reset client local format data?  */
            avl_insert (dest->pending_tree, (void *)client);
        }

        avl_tree_wlock (source->client_tree);
        while (1)
        {
            avl_node *node = avl_get_first (source->client_tree);
            if (node == NULL)
                break;

            client = (client_t *)(node->key);
            avl_delete (source->client_tree, client, NULL);

            /* TODO: reset client local format data?  */
            avl_insert (dest->pending_tree, (void *)client);
        }
        source->listeners = 0;
        stats_event (source->mount, "listeners", "0");
        avl_tree_unlock (source->client_tree);

    } while (0);

    avl_tree_unlock (source->pending_tree);
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    avl_tree_unlock (dest->pending_tree);
    thread_mutex_unlock (&move_clients_mutex);
}

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static void source_init (source_t *source)
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{
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    ice_config_t *config = config_get_config();
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    char *listenurl, *str;
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    int listen_url_size;

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    /* 6 for max size of port */
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    listen_url_size = strlen("http://") + strlen(config->hostname) +
        strlen(":") + 6 + strlen(source->mount) + 1;

    listenurl = malloc (listen_url_size);
    memset (listenurl, '\000', listen_url_size);
    snprintf (listenurl, listen_url_size, "http://%s:%d%s",
            config->hostname, config->port, source->mount);
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    source->burst_on_connect = config->burst_on_connect;
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    config_release_config();

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    /* maybe better in connection.c */
    if ((str = httpp_getvar(source->parser, "ice-public")))
        source->yp_public = atoi(str);
    if ((str = httpp_getvar(source->parser, "icy-pub")))
        source->yp_public = atoi(str);
    if (str == NULL)
       str = "0";
    stats_event (source->mount, "public", str);

    str = httpp_getvar(source->parser, "ice-audio-info");
    source->audio_info = util_dict_new();
    if (str)
    {
        _parse_audio_info (source, str);
        stats_event (source->mount, "audio_info", str);
    }

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    stats_event (source->mount, "listenurl", listenurl);

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    if (listenurl) {
        free(listenurl);
    }
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    if (source->dumpfilename != NULL)
    {
        source->dumpfile = fopen (source->dumpfilename, "ab");
        if (source->dumpfile == NULL)
        {
            WARN2("Cannot open dump file \"%s\" for appending: %s, disabling.",
                    source->dumpfilename, strerror(errno));
        }
    }

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    /* grab a read lock, to make sure we get a chance to cleanup */
    thread_rwlock_rlock (source->shutdown_rwlock);

    /* start off the statistics */
    source->listeners = 0;
    stats_event_inc (NULL, "sources");
    stats_event_inc (NULL, "source_total_connections");
    stats_event (source->mount, "listeners", "0");
    stats_event (source->mount, "type", source->format->format_description);
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    sock_set_blocking (source->con->sock, SOCK_NONBLOCK);
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    thread_mutex_create(&source->queue_mutex);

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    DEBUG0("Source creation complete");
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    source->running = 1;
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    /*
    ** Now, if we have a fallback source and override is on, we want
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    ** to steal its clients, because it means we've come back online
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    ** after a failure and they should be gotten back from the waiting
    ** loop or jingle track or whatever the fallback is used for
    */

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    if (source->fallback_override && source->fallback_mount)
    {
        source_t *fallback_source;

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        avl_tree_rlock(global.source_tree);
        fallback_source = source_find_mount(source->fallback_mount);

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        if (fallback_source)
            source_move_clients (fallback_source, source);
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        avl_tree_unlock(global.source_tree);
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    }
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    if (source->yp_public)
        yp_add (source);
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}


void source_main (source_t *source)
{
    char buffer[4096];
    long bytes, sbytes;
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    int ret, i;
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    client_t *client;
    avl_node *client_node;

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    refbuf_t *refbuf, *abuf, *stale_refbuf;
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    int data_done;

    source_init (source);
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    while (global.running == ICE_RUNNING && source->running) {
        ret = source->format->get_buffer(source->format, NULL, 0, &refbuf);
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        if(ret < 0) {
            WARN0("Bad data from source");
            break;
        }
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        if (source->burst_on_connect) {
            thread_mutex_lock(&source->queue_mutex);
            /* Add to the source buffer */
            if (refbuf) {
                refbuf_addref(refbuf);
                refbuf_queue_add(&(source->queue), refbuf);
                /* We derive the size of the source buffer queue based off the 
                   setting for queue_size_limit (client buffer queue size).  
                   This is because the source buffer queue size should be a
                   percentage of the client buffer size (definately cannot
                   be larger). Why 50% ? Because > 75% does not give the
                   client enough leeway for lagging on initial connection
                   and < 25% does not provide a good enough burst on connect. */
                if (refbuf_queue_length(&(source->queue)) > 
                    source->queue_size_limit/2) {
                    stale_refbuf = refbuf_queue_remove(&(source->queue));
                    refbuf_release(stale_refbuf);
                }
            }
            thread_mutex_unlock(&source->queue_mutex);
        }
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        bytes = 1; /* Set to > 0 so that the post-loop check won't be tripped */
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        while (refbuf == NULL) {
            bytes = 0;
            while (bytes <= 0) {
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                ret = util_timed_wait_for_fd(source->con->sock, source->timeout*1000);
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                if (ret < 0 && sock_recoverable (sock_error()))
                   continue;
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                if (ret <= 0) { /* timeout expired */
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                    WARN1("Disconnecting source: socket timeout (%d s) expired",
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                           source->timeout);
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                    bytes = 0;
                    break;
                }
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                bytes = sock_read_bytes(source->con->sock, buffer, 4096);
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                if (bytes == 0 || 
                        (bytes < 0 && !sock_recoverable(sock_error()))) 
                {
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                    DEBUG1("Disconnecting source due to socket read error: %s",
                            strerror(sock_error()));
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                    break;
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                }
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            }
            if (bytes <= 0) break;
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            source->client->con->sent_bytes += bytes;
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            ret = source->format->get_buffer(source->format, buffer, bytes, 
                    &refbuf);
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            if(ret < 0) {
                WARN0("Bad data from source");
                goto done;
            }
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            if (source->burst_on_connect) {
                /* Add to the source buffer */
                thread_mutex_lock(&source->queue_mutex);
                if (refbuf) {
                    refbuf_addref(refbuf);
                    refbuf_queue_add(&(source->queue), refbuf);
                    if (refbuf_queue_length(&(source->queue)) > 
                        source->queue_size_limit/2) {
                        stale_refbuf = refbuf_queue_remove(&(source->queue));
                        refbuf_release(stale_refbuf);
                    }
                }
                thread_mutex_unlock(&source->queue_mutex);
            }
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        }

        if (bytes <= 0) {
            INFO0("Removing source following disconnection");
            break;
        }

        /* we have a refbuf buffer, which a data block to be sent to 
        ** all clients.  if a client is not able to send the buffer
        ** immediately, it should store it on its queue for the next
        ** go around.
        **
        ** instead of sending the current block, a client should send
        ** all data in the queue, plus the current block, until either
        ** it runs out of data, or it hits a recoverable error like
        ** EAGAIN.  this will allow a client that got slightly lagged
        ** to catch back up if it can
        */
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        /* First, stream dumping, if enabled */
        if(source->dumpfile) {
            if(fwrite(refbuf->data, 1, refbuf->len, source->dumpfile) !=
                    refbuf->len) 
            {
                WARN1("Write to dump file failed, disabling: %s", 
                        strerror(errno));
                fclose(source->dumpfile);
                source->dumpfile = NULL;
            }
        }

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        /* acquire read lock on client_tree */
        avl_tree_rlock(source->client_tree);
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        client_node = avl_get_first(source->client_tree);
        while (client_node) {
            /* acquire read lock on node */
            avl_node_wlock(client_node);
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            client = (client_t *)client_node->key;
            
            data_done = 0;
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            /* do we have any old buffers? */
            abuf = refbuf_queue_remove(&client->queue);
            while (abuf) {
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                bytes = abuf->len - client->pos;
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                sbytes = source->format->write_buf_to_client(source->format,
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                        client, &abuf->data[client->pos], bytes);
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                if (sbytes < bytes) {
                    if (client->con->error) {
                        refbuf_release (abuf);
                    }
                    else {
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                        /* We didn't send the entire buffer. Leave it for
                         * the moment, handle it in the next iteration.
                         */
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                        client->pos += sbytes<0?0:sbytes;
                        refbuf_queue_insert (&client->queue, abuf);
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                    }
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                    data_done = 1;
                    break;
                }
                /* we're done with that refbuf, release it and reset the pos */
                refbuf_release(abuf);
                client->pos = 0;

                abuf = refbuf_queue_remove(&client->queue);
            }
            
            /* now send or queue the new data */
            if (data_done) {
                refbuf_addref(refbuf);
                refbuf_queue_add(&client->queue, refbuf);
            } else {
                sbytes = source->format->write_buf_to_client(source->format,
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                        client, refbuf->data, refbuf->len);
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                if (client->con->error == 0 && sbytes < refbuf->len) {
                    /* Didn't send the entire buffer, queue it */
                    client->pos = sbytes<0?0:sbytes;
                    refbuf_addref(refbuf);
                    refbuf_queue_insert(&client->queue, refbuf);
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                }
            }

            /* if the client is too slow, its queue will slowly build up.
            ** we need to make sure the client is keeping up with the
            ** data, so we'll kick any client who's queue gets to large.
            */
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            if (refbuf_queue_length(&client->queue) > source->queue_size_limit) {
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                DEBUG0("Client has fallen too far behind, removing");
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                client->con->error = 1;
            }

            /* release read lock on node */
            avl_node_unlock(client_node);

            /* get the next node */
            client_node = avl_get_next(client_node);
        }
        /* release read lock on client_tree */
        avl_tree_unlock(source->client_tree);

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        /* Only release the refbuf if we didn't add it to the source queue */
        if (!source->burst_on_connect) {
            refbuf_release(refbuf);
        }
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        /* acquire write lock on client_tree */
        avl_tree_wlock(source->client_tree);

        /** delete bad clients **/
        client_node = avl_get_first(source->client_tree);
        while (client_node) {
            client = (client_t *)client_node->key;
            if (client->con->error) {
                client_node = avl_get_next(client_node);
                avl_delete(source->client_tree, (void *)client, _free_client);
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                source->listeners--;
                stats_event_args(source->mount, "listeners", "%d", 
                        source->listeners);
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                DEBUG0("Client removed");
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                continue;
            }
            client_node = avl_get_next(client_node);
        }

        /* acquire write lock on pending_tree */
        avl_tree_wlock(source->pending_tree);

        /** add pending clients **/
        client_node = avl_get_first(source->pending_tree);
        while (client_node) {
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            if(source->max_listeners != -1 && 
                    source->listeners >= source->max_listeners) 
            {
                /* The common case is caught in the main connection handler,
                 * this deals with rarer cases (mostly concerning fallbacks)
                 * and doesn't give the listening client any information about
                 * why they were disconnected
                 */
                client = (client_t *)client_node->key;
                client_node = avl_get_next(client_node);
                avl_delete(source->pending_tree, (void *)client, _free_client);

                INFO0("Client deleted, exceeding maximum listeners for this "
                        "mountpoint.");
                continue;
            }
            
            /* Otherwise, the client is accepted, add it */
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            avl_insert(source->client_tree, client_node->key);
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            source->listeners++;
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            DEBUG0("Client added");
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            stats_event_inc(NULL, "clients");
            stats_event_inc(source->mount, "connections");
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            stats_event_args(source->mount, "listeners", "%d", 
                    source->listeners);
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            /* we have to send cached headers for some data formats
            ** this is where we queue up the buffers to send
            */
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            client = (client_t *)client_node->key;
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            if (source->format->has_predata) {
                client->queue = source->format->get_predata(source->format);
            }
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            if (source->burst_on_connect) {
                /* here is where we fill up the new client with refbufs from
                   the source buffer.  this will allow an initial burst of
                   audio data to be sent to the client, and allow for a faster
                   startup time (from listener perspective) for the stream */ 
                if (!client->burst_sent) {
                    thread_mutex_lock(&source->queue_mutex);
                    for (i=0;i<refbuf_queue_size(&(source->queue));i++) {
                        refbuf_queue_add(&(client->queue),
                            refbuf_queue_get(&(source->queue), i));
                    }
                    thread_mutex_unlock(&source->queue_mutex);
                    client->burst_sent = 1;
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                    DEBUG1("Added %d buffers to initial client queue", 
                            refbuf_queue_length(&(source->queue)));
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                }
            }
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            client_node = avl_get_next(client_node);
        }

        /** clear pending tree **/
        while (avl_get_first(source->pending_tree)) {
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            avl_delete(source->pending_tree, 
                    avl_get_first(source->pending_tree)->key, 
                    source_remove_client);
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        }

        /* release write lock on pending_tree */
        avl_tree_unlock(source->pending_tree);

        /* release write lock on client_tree */
        avl_tree_unlock(source->client_tree);
    }
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done:

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    source->running = 0;
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    INFO1("Source \"%s\" exiting", source->mount);
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    /* we have de-activated the source now, so no more clients will be
     * added, now move the listeners we have to the fallback (if any)
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     */
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    if (source->fallback_mount)
    {
        source_t *fallback_source;
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        avl_tree_rlock(global.source_tree);
        fallback_source = source_find_mount (source->fallback_mount);
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        if (fallback_source != NULL)
            source_move_clients (source, fallback_source);

        avl_tree_unlock (global.source_tree);
    }
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    /* delete this sources stats */
    stats_event_dec(NULL, "sources");
    stats_event(source->mount, "listeners", NULL);
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    /* we don't remove the source from the tree here, it may be a relay and
       therefore reserved */
    source_clear_source (source);

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    global_lock();
    global.sources--;
    global_unlock();
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    /* release our hold on the lock so the main thread can continue cleaning up */
    thread_rwlock_unlock(source->shutdown_rwlock);
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    return;
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}

static int _compare_clients(void *compare_arg, void *a, void *b)
{
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    client_t *clienta = (client_t *)a;
    client_t *clientb = (client_t *)b;

    connection_t *cona = clienta->con;
    connection_t *conb = clientb->con;
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    if (cona->id < conb->id) return -1;
    if (cona->id > conb->id) return 1;
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    return 0;
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}

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int source_remove_client(void *key)
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{
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    return 1;
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}

static int _free_client(void *key)
{
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    client_t *client = (client_t *)key;

    global_lock();
    global.clients--;
    global_unlock();
    stats_event_dec(NULL, "clients");
    
    client_destroy(client);
    
    return 1;
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}
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static void _parse_audio_info (source_t *source, const char *s)
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{
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    const char *start = s;
    unsigned len;

    while (start != NULL && *start != '\0')
    {
        if ((s = strchr (start, ';')) == NULL)
            len = strlen (start);
        else
        {
            len = (int)(s - start);
            s++; /* skip passed the ';' */
        }
        if (len)
        {
            char name[100], value[100];
            char *esc;

            sscanf (start, "%199[^=]=%199[^;\r\n]", name, value);
            esc = util_url_unescape (value);
            if (esc)
            {
                util_dict_set (source->audio_info, name, esc);
                stats_event (source->mount, name, value);
                free (esc);
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            }
        }
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        start = s;
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    }
}
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void source_apply_mount (source_t *source, mount_proxy *mountinfo)
{
    DEBUG1("Applying mount information for \"%s\"", source->mount);
    source->max_listeners = mountinfo->max_listeners;
    source->fallback_override = mountinfo->fallback_override;
    source->no_mount = mountinfo->no_mount;
    if (mountinfo->fallback_mount)
    {
        source->fallback_mount = strdup (mountinfo->fallback_mount);
        DEBUG1 ("fallback %s", mountinfo->fallback_mount);
    }
    if (mountinfo->auth_type != NULL)
    {
        source->authenticator = auth_get_authenticator(
                mountinfo->auth_type, mountinfo->auth_options);
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        stats_event(source->mount, "authenticator", mountinfo->auth_type);
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    }
    if (mountinfo->dumpfile)
    {
        DEBUG1("Dumping stream to %s", mountinfo->dumpfile);
        source->dumpfilename = strdup (mountinfo->dumpfile);
    }
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    if (mountinfo->queue_size_limit)
    {
        source->queue_size_limit = mountinfo->queue_size_limit;
        DEBUG1 ("queue size to %u", source->queue_size_limit);
    }
    if (mountinfo->source_timeout)
    {
        source->timeout = mountinfo->source_timeout;
        DEBUG1 ("source timeout to %u", source->timeout);
    }
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}


void *source_client_thread (void *arg)
{
    source_t *source = arg;
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    const char ok_msg[] = "HTTP/1.0 200 OK\r\n\r\n";
    int bytes;

    source->client->respcode = 200;
    bytes = sock_write_bytes (source->client->con->sock, ok_msg, sizeof (ok_msg)-1);
    if (bytes < sizeof (ok_msg)-1)
    {
        global_lock();
        global.sources--;
        global_unlock();
        WARN0 ("Error writing 200 OK message to source client");
    }
    else
    {
        source->client->con->sent_bytes += bytes;
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        stats_event_inc(NULL, "source_client_connections");
        source_main (source);
    }
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    source_free_source (source);
    return NULL;
}