/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2002-2003 M. Warner Losh <imp@FreeBSD.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef DEVD_HH
#define DEVD_HH

class config;

/**
 * var_list is a collection of variables.  These collections of variables
 * are stacked up and popped down for each event that we have to process.
 * We have multiple levels so that we can push variables that are unique
 * to the event in question, in addition to having global variables.  This
 * allows for future flexibility.
 */
class var_list
{
public:
        /** Set a variable in this var list.
         */
        void set_variable(const std::string &var, const std::string &val);
        /** Get the variable out of this, and no other, var_list.  If
         * no variable of %var is set, then %bogus will be returned.
         */
        const std::string &get_variable(const std::string &var) const;
        /** Is there a variable of %var set in this table?
         */
        bool is_set(const std::string &var) const;
        /** A completely bogus string.
         */
        static const std::string bogus;
        static const std::string nothing;

private:
        std::string fix_value(const std::string &val) const;

        std::map<std::string, std::string> _vars;
};

/**
 * eps is short for event_proc_single.  It is a single entry in an
 * event_proc.  Each keyword needs its own subclass from eps.
 */
struct eps
{
public:
        virtual ~eps() {}
        /** Does this eps match the current config?
         */
        virtual bool do_match(config &) = 0;
        /** Perform some action for this eps.
         */
        virtual bool do_action(config &) = 0;
};

/**
 * match is the subclass used to match an individual variable.  Its
 * actions are nops.
 */
class match : public eps
{
public:
        match(config &, const char *var, const char *re);
        virtual ~match();
        virtual bool do_match(config &);
        virtual bool do_action(config &) { return true; }
private:
        bool _inv;
        std::string _var;
        std::string _re;
        regex_t _regex;
};

/**
 * media is the subclass used to match an individual variable.  Its
 * actions are nops.
 */
class media : public eps
{
public:
        media(config &, const char *var, const char *type);
        virtual ~media();
        virtual bool do_match(config &);
        virtual bool do_action(config &) { return true; }
private:
        std::string _var;
        int _type;
};

/**
 * action is used to fork a process.  It matches everything.
 */
class action : public eps
{
public:
        action(const char *cmd);
        virtual ~action();
        virtual bool do_match(config &) { return true; }
        virtual bool do_action(config &);
private:
        std::string _cmd;
};

struct event_proc
{
public:
        event_proc();
        virtual ~event_proc();
        int get_priority() const { return (_prio); }
        void set_priority(int prio) { _prio = prio; }
        void add(eps *);
        bool matches(config &) const;
        bool run(config &) const;
private:
        int _prio;
        std::vector<eps *> _epsvec;
};

class config
{
public:
        config() { push_var_table(); }
        virtual ~config() { reset(); }
        void add_attach(int, event_proc *);
        void add_detach(int, event_proc *);
        void add_directory(const char *);
        void add_nomatch(int, event_proc *);
        void add_notify(int, event_proc *);
        void set_pidfile(const char *);
        void reset();
        void parse();
        void close_pidfile();
        void open_pidfile();
        void write_pidfile();
        void remove_pidfile();
        void push_var_table();
        void pop_var_table();
        void set_variable(const char *var, const char *val);
        const std::string &get_variable(const std::string &var);
        const std::string expand_string(const char * var, 
            const char * prepend = NULL, const char * append = NULL);
        char *set_vars(char *);
        void find_and_execute(char);
protected:
        void sort_vector(std::vector<event_proc *> &);
        void parse_one_file(const char *fn);
        void parse_files_in_dir(const char *dirname);
        void expand_one(const char *&src, std::string &dst, bool is_shell);
        std::string shell_quote(const std::string &s);
        bool is_id_char(char) const;
        bool chop_var(char *&buffer, char *&lhs, char *&rhs) const;
private:
        std::vector<std::string> _dir_list;
        std::string _pidfile;
        std::vector<var_list *> _var_list_table;
        std::vector<event_proc *> _attach_list;
        std::vector<event_proc *> _detach_list;
        std::vector<event_proc *> _nomatch_list;
        std::vector<event_proc *> _notify_list;
};

#endif /* DEVD_HH */