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/***************************************************************************
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section_list.h - description
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-------------------
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Copyright : (C) 2004-2025 by Leaflet
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Email : leaflet@leafok.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef _SECTION_LIST_H_
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#define _SECTION_LIST_H_
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#include "common.h"
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#include "bbs.h"
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#include <time.h>
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#define BBS_article_title_max_len 80
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#define BBS_article_limit_per_section 50000
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#define BBS_article_limit_per_page 20
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#define ARTICLE_PER_BLOCK 1000
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struct article_t
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{
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int32_t aid;
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int32_t tid;
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int32_t sid;
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int32_t cid;
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int32_t uid;
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struct article_t *p_prior; // prior article
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struct article_t *p_next; // next article
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struct article_t *p_topic_prior; // same topic
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struct article_t *p_topic_next; // same topic
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int8_t visible;
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int8_t excerption;
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int8_t ontop;
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int8_t lock;
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int8_t transship;
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char username[BBS_username_max_len + 1];
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char nickname[BBS_nickname_max_len + 1];
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char title[BBS_article_title_max_len + 1];
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time_t sub_dt;
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};
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typedef struct article_t ARTICLE;
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struct section_list_t
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{
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int32_t sid;
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int32_t class_id;
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int8_t enable;
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char sname[BBS_section_name_max_len + 1];
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char stitle[BBS_section_title_max_len + 1];
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char master_name[BBS_username_max_len + 1];
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int read_user_level;
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int write_user_level;
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int32_t article_count;
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int32_t topic_count;
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int32_t visible_article_count;
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int32_t visible_topic_count;
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ARTICLE *p_article_head;
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ARTICLE *p_article_tail;
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ARTICLE *p_page_first_article[BBS_article_limit_per_section / BBS_article_limit_per_page];
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int32_t page_count;
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int32_t last_page_visible_article_count;
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};
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typedef struct section_list_t SECTION_LIST;
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// article_block_count * ARTICLE_PER_BLOCK should be
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// no less than BBS_article_limit_per_section * BBS_max_section,
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// in order to allocate enough memory for blocks
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extern int article_block_init(const char *filename, int block_count);
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extern void article_block_cleanup(void);
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extern int set_article_block_shm_readonly(void);
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extern int detach_article_block_shm(void);
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extern int article_block_reset(void);
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extern ARTICLE *article_block_find_by_aid(int32_t aid);
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extern ARTICLE *article_block_find_by_index(int index);
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extern int32_t article_block_last_aid(void);
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extern int article_block_article_count(void);
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extern int article_count_of_topic(int32_t aid);
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extern int section_list_init(const char *filename);
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extern void section_list_cleanup(void);
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extern int set_section_list_shm_readonly(void);
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extern int detach_section_list_shm(void);
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extern SECTION_LIST *section_list_create(int32_t sid, const char *sname, const char *stitle, const char *master_name);
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extern void section_list_reset_articles(SECTION_LIST *p_section);
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extern SECTION_LIST *section_list_find_by_name(const char *sname);
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extern SECTION_LIST *section_list_find_by_sid(int32_t sid);
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extern int get_section_index(SECTION_LIST *p_section);
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extern int section_list_append_article(SECTION_LIST *p_section, const ARTICLE *p_article_src);
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extern int section_list_set_article_visible(SECTION_LIST *p_section, int32_t aid, int8_t visible);
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// *p_page, *p_offset will be set as page / offset of the article with aid in *p_section (including both visible and invisible articles)
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// *pp_next will be set as pointer to the next article of the article with aid
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// *pp_next will be set as head article of the section if the article with aid locates at the tail of the section
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extern ARTICLE *section_list_find_article_with_offset(SECTION_LIST *p_section, int32_t aid, int32_t *p_page, int32_t *p_offset, ARTICLE **pp_next);
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extern int section_list_calculate_page(SECTION_LIST *p_section, int32_t start_aid);
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extern int section_list_move_topic(SECTION_LIST *p_section_src, SECTION_LIST *p_section_dest, int32_t aid);
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extern int section_list_try_rd_lock(SECTION_LIST *p_section, int wait_sec);
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extern int section_list_try_rw_lock(SECTION_LIST *p_section, int wait_sec);
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extern int section_list_rd_unlock(SECTION_LIST *p_section);
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extern int section_list_rw_unlock(SECTION_LIST *p_section);
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extern int section_list_rd_lock(SECTION_LIST *p_section);
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extern int section_list_rw_lock(SECTION_LIST *p_section);
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#endif //_SECTION_LIST_H_
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