#ifndef __KINGATE_CGI_GATEWAY_H
#define __KINGATE_CGI_GATEWAY_H

#include <map>
#include "kingate/cgi_interface.h"

/**
 * @file
 * @brief the cgi_gateway -- main interface to CGI.
 */

namespace kingate {
    using namespace std;

    /**
     * The main class interfacing with the CGI environment.
     */
    class cgi_gateway {
	public:
	    /**
	     * The interface to CGI environment (e.g. fastcgi).
	     */
	    cgi_interface& iface;
	    /**
	     * The type describing map holding parameters parsed from query string or input.
	     */
	    typedef multimap<string,string> params_t;
	    /**
	     * The GET-passed parameters.
	     */
	    params_t get;
	    /**
	     * The POST-passed parameters.
	     */
	    params_t post;
	    /**
	     * Was the stdin content parsed?
	     */
	    bool b_parsed_content;

	    /**
	     * @param ci the interface to use.
	     */
	    cgi_gateway(cgi_interface& ci);

	    /**
	     * Check whether there is an 'environment' meta-variable with specific name
	     * passed to CGI.
	     * @param n variable name.
	     * @return true if yes.
	     * @see cgi_interface::has_meta()
	     * @see get_meta()
	     */
	    bool has_meta(const string& n) const { return iface.has_meta(n); }
	    /**
	     * Retrieve the 'environment' meta-variable value.
	     * @param n variable name.
	     * @return variable contents.
	     * @see exception_notfound
	     * @see cgi_interface::get_meta()
	     */
	    string get_meta(const string& n) const { return iface.get_meta(n); }

	    /**
	     * fetch reference to the 'stdin' stream.
	     * @return the reference to the corresponding istream object.
	     * @see cgi_interface::in()
	     */
	    istream& in() { return iface.in(); }
	    /**
	     * fetch reference to the 'stdout' stream.
	     * @return the reference to the corresponding ostream object.
	     * @see cgi_interface::out()
	     */
	    ostream& out() { return iface.out(); }
	    /**
	     * fetch reference to the 'stderr' stream.
	     * @return the reference to the corresponding ostream object.
	     * @see cgi_interface::err()
	     */
	    ostream& err() { return iface.err(); }
	    /**
	     * cast to the ostream -- fetches the reference to the 'stdout'
	     * stream.
	     * @see out()
	     */
	    operator ostream& (void) { return out(); }

	    /**
	     * Check to see whether the parameter was passed via GET.
	     * @param n the parameter name.
	     * @return true if yes.
	     */
	    bool has_GET(const string& n) const;
	    /**
	     * Retrieve the parameter passed via GET.
	     * @param n the parameter name.
	     * @return the parameter contents.
	     * @see exception_notfound
	     */
	    string get_GET(const string& n) const;
	    /**
	     * Check to see whether the parameter was passed via POST.
	     * @param n the parameter name.
	     * @return true if yes.
	     */
	    bool has_POST(const string& n) const;
	    /**
	     * Retrieve the POST-parameter.
	     * @param n the parameter name.
	     * @return the parameter contents.
	     * @see exception_notfound
	     */
	    string get_POST(const string& n) const;
	    /**
	     * Check to see whether the parameter was passed either via POST or
	     * GET.
	     * @param n the parameter name.
	     * @return true if yes.
	     */
	    bool has_param(const string& n) const;
	    /**
	     * Retrieve the parameter passed either via POST or GET
	     * (GET-parameter takes precedence).
	     * @param n the parameter name.
	     * @return true if yes.
	     * @see exception_notfound.
	     */
	    string get_param(const string& n) const;

	    /**
	     * Retrieve the POST content-type (as passed via CONTENT_TYPE
	     * environment variable).
	     * @return the content type.
	     */
	    const string& get_content_type() const;
	    /**
	     * Retrieve the POST content length (as passed via the
	     * CONTENT_LENGTH environment variable).
	     * @return the content length.
	     */
	    unsigned long get_content_length() const;

	    /**
	     * Check to see whether the content from stdin stream was parsed.
	     * @return true if yes.
	     */
	    bool is_content_parsed() const { return b_parsed_content; }
	private:
	    /**
	     * Parse the query string, putting the parameters into the map
	     * specified.
	     * @param q the query string.
	     * @param p destination parameters map.
	     */
	    static void parse_query(string& q,params_t& p);
    };

}

#endif /* __KINGATE_CGI_GATEWAY_H */
/*
 * vim:set ft=cpp:
 */