// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2009 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC.  If not, see <http://www.gnu.org/licenses/>.

#ifndef _CS_NOTICE_
#define _CS_NOTICE_

// Code related to "notices", which come from
// 1) RSS feeds specified by projects and account managers
// 2) Scheduler replies (high-priority messages)
// 3) the client (MSG_USER_ALERT messages)
//
// Classes:
//
// NOTICE represents a notice of any the above types.
// Attributes include an "arrival time"; for RSS items, this is the time it
// arrived at the client, not the create time.
//
// NOTICES represents the set of all current notices.
// Each notice has a unique seqno, which is a total ordering
// compatible with increasing arrival time.
// GUI RPC allow the enumerating of notices above a given seqno.
// Seqnos are not permanent.
//
// RSS_FEED represents an RSS feed.
// The client polls each feed periodically.
//
// The last successful reply from each feed is cached on disk.
//
// Two projects may request the same feed.
// So each PROJECT has its own list of feeds.
// There's also a merged list "rss_feeds" where seqno is stored.
//
// files:
// notices/feeds.xml                feed list
// notices/feeds_PROJ_URL.xml       list of project feeds
// notices/RSS_URL.xml              result of last fetch for a feed
// notices/archive_RSS_URL.xml      archive for a feed

#include <deque>
#include <vector>

#include "miofile.h"

#include "gui_http.h"
#include "client_types.h"
#include "gui_rpc_server.h"

#include "notice.h"

struct NOTICES {
    std::deque<NOTICE> notices;
        // stored newest (i.e. highest seqno) message first
    void write(int seqno, GUI_RPC_CONN&, bool public_only);
    bool append(NOTICE&);
    void init();
    void init_rss();
    int read_archive_file(const char* file, struct RSS_FEED*);
    void write_archive(struct RSS_FEED*);
    bool remove_dups(NOTICE&);
    void remove_network_msg();
    void remove_scheduler_notices(PROJECT*);
    void clear_keep();
        // prior to parsing an RSS feed, we mark all notices as "don't keep".
        // We clear this flag if the notice is present in the feed.
    void unkeep(const char* url);
        // called after parsing an RSS feed,
        // to remove notices that weren't in the feed.
    void clear() {
        notices.clear();
    }
};

extern NOTICES notices;

struct RSS_FEED {
    char url[256];
    char url_base[256];
    char project_name[256];
    double poll_interval;
    double next_poll_time;
    bool found;
        // temp used in garbage collection

    int fetch_start();
    int fetch_complete();

    void write(MIOFILE&);
    int parse_desc(XML_PARSER&);
    int parse_items(XML_PARSER&, int&);
    void feed_file_name(char*);
    void archive_file_name(char*);
    int read_archive_file();
};

struct RSS_FEED_OP: public GUI_HTTP_OP {
    int error_num;
    RSS_FEED* rfp;

    RSS_FEED_OP();
    virtual ~RSS_FEED_OP(){}
    virtual void handle_reply(int http_op_retval);
    bool poll();
};

extern RSS_FEED_OP rss_feed_op;

struct RSS_FEEDS {
    std::vector<RSS_FEED> feeds;
    void init();
    void trigger_fetch(struct PROJ_AM*);
    void update_feed_list();
    RSS_FEED* lookup_url(char*);
    void update_proj_am(PROJ_AM*);
    void write_feed_list();
    void clear() {
        feeds.clear();
    }
};

extern RSS_FEEDS rss_feeds;

int parse_rss_feed_descs(XML_PARSER&, std::vector<RSS_FEED>&);
void handle_sr_feeds(std::vector<RSS_FEED>&, struct PROJ_AM*);
    // process the feeds in a scheduler reply

#endif