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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2013 Olaf Wintermann. All rights reserved.
 *
 * 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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 WS_WEBDAV_H
#define	WS_WEBDAV_H

#include "nsapi.h"

#include <sys/file.h>
#include <sys/stat.h>
#include <inttypes.h>

#ifdef	__cplusplus
extern "C" {
#endif

typedef struct DavCollection          DavCollection;
    
typedef struct PropfindResponse       PropfindResponse;
typedef struct PersistenceManager     PersistenceManager;

typedef struct PropfindRequest        PropfindRequest;
typedef struct ProppatchRequest       ProppatchRequest;
typedef struct DavProperty            DavProperty;

typedef struct Propstat               Propstat;

typedef struct XmlNs                  XmlNs;
typedef struct XmlNsMap               XmlNsMap;

typedef struct XmlData                XmlData;
typedef struct XmlElement             XmlElement;

typedef uint8_t                       xmlch_t;

typedef struct UcxList                List;
typedef struct UcxMap                 Map;

typedef struct _strbuf                Buffer;

struct DavCollection {
    PersistenceManager *mgr;
    // callbacks
};

struct PropfindRequest {
    Session            *sn;
    Request            *rq;
    
    XmlNsMap           *nsmap;
    
    List               *properties; /* DavProperty list, requested props */
    int8_t             allprop;
    int8_t             propname;
    
    int8_t             prop;
    int8_t             isdir;
    List               *notFoundProps;
    List               *forbiddenProps;
    PersistenceManager *persistencemgr;
    void               *mgrdata;

    char               *path;
    char               *uri;

    Buffer             *out;
};

struct ProppatchRequest {
    Session            *sn;
    Request            *rq;
    
    List               *setProps;    /* XmlElement list, set props */
    List               *removeProps; /* DavProperty list, remove props */
    
    Propstat           *propstat;
    XmlNsMap           *nsmap;
    
    PersistenceManager *backend;
    
    char               *path;
    
    Buffer             *out;
};

struct Propstat {
    List           *okprop; /* properties with status 200 OK */
    Map            *map;    /* all other properties */
    pool_handle_t  *pool;
};

struct DavProperty {
    XmlNs *xmlns;
    char  *name;
};

struct XmlData {
    XmlNsMap   *nsmap;
    XmlElement *elm;
};

struct XmlElement {
    XmlNs  *xmlns;
    char   *name;
    void   *content; /* xmlch* or UcxDlist* */
    size_t ctlen;    /* content string length. If 0, content is a UcxDlist */
};

struct XmlNs {
    char *xmlns;
    char *prefix;
    int  nslen;
    int  prelen;
};

struct XmlNsMap {
    Map           *map;
    pool_handle_t *pool;
    int num;
};

typedef void(*dav_propfind_begin_f)(PersistenceManager*, PropfindRequest*);
typedef void(*dav_propfind_end_f)(PersistenceManager*, PropfindRequest*);
typedef void(*dav_propfind_f)(PersistenceManager*,PropfindRequest*,char*);
typedef void(*dav_proppatch_f)(PersistenceManager*,ProppatchRequest*);
struct PersistenceManager {
    void(*propfind_begin)(PersistenceManager *mgr, PropfindRequest *rq);
    void(*propfind_end)(PersistenceManager *mgr, PropfindRequest *rq);
    
    /*
     * void propfind(PersistenceManager *mgr, PropfindRequest *rq, char *path)
     * 
     * Gets all requested properties for a WebDAV resource(file). This function
     * should add properties with dav_propfind_add_str_prop or
     * dav_prop_add_xml_prop. Unavailable properties should be added with
     * dav_propfind_add_prop_error
     * 
     * 
     * mgr:  WebDAV Persistence Manager
     * rq:   current PropfindRequest object
     * path: the webdav resource path
     */
    void(*propfind)(PersistenceManager *mgr, PropfindRequest *rq, char *path);
    
    /*
     * void proppatch(PersistenceManager *mgr, ProppatchRequest *rq)
     * 
     * Sets properties for a WebDAV resource. It should add all properties to
     * the propstat object (member of the ProppatchRequest).
     * 
     * mgr:  WebDAV backend
     * path: current ProppatchRequest object
     */
    void(*proppatch)(PersistenceManager *mgr, ProppatchRequest *rq);
    
    /*
     * bool
     * if true, some properties are get from the VFS and not from this
     * persistence manager
     */
    int vfs_props;
};

void webdav_add_persistence_manager(char *name, PersistenceManager *mgr);

int webdav_service(pblock *pb, Session *sn, Request *rq);
int webdav_put(pblock *pb, Session *sn, Request *rq);
int webdav_delete(pblock *pb, Session *sn, Request *rq);
int webdav_mkcol(pblock *pb, Session *sn, Request *rq);
int webdav_copy(pblock *pb, Session *sn, Request *rq);
int webdav_move(pblock *pb, Session *sn, Request *rq);
int webdav_propfind(pblock *pb, Session *sn, Request *rq);
int webdav_proppatch(pblock *pb, Session *sn, Request *rq);


/*
 * dav_propfind_add_str_prop
 * 
 * Adds a string property to the current WebDAV resource response
 */
void dav_propfind_add_str_prop(
        PropfindRequest *rq,
        DavProperty* prop,
        char *str,
        size_t len);

//void dav_propfind_add_xml_prop();

/*
 * dav_propfind_add_prop_error
 * 
 * Adds a unavailable property to the response
 * 
 * rq:    propfind request object
 * prop:  unavailable property
 * error: HTTP status code
 */
void dav_propfind_add_prop_error(
        PropfindRequest *rq,
        DavProperty *prop,
        int error);



/*---------------------------------- utils ----------------------------------*/

/*
 * XmlNsMap
 * 
 * a map containing xml namespaces
 * 
 * key:    namespace uri
 * value:  XmlNs object, containing namespace uri and the prefix
 */

XmlNsMap* xmlnsmap_create(pool_handle_t *pool);

void xmlnsmap_free(XmlNsMap *map);

/*
 * Puts a namespace in the map. If the namespace is already in the map, the
 * available XmlNs object is returned
 */
XmlNs* xmlnsmap_put(XmlNsMap *map, char *ns);

/*
 * Gets a namespace from the map. Returns NULL if the namespace is not in the
 * map
 */
XmlNs* xmlnsmap_get(XmlNsMap *map, char *ns);



/*
 * XmlElement
 * 
 * representing a xml element
 */

/*
 * adds a xml element to a parent element
 */
void xmlelm_add_child(XmlElement *parent, XmlElement *child);

/*
 * writes an xml element to an output buffer
 * if wv is true, it writes the complete value of the element
 */
void xmlelm_write(XmlElement *elm, Buffer *out, int wv);


/*
 * PropstatMap
 * 
 * A map containing multiple propstat objects
 * 
 * key:    status code:  int
 * value:  prop list:    UcxDlist* (list of XmlElement*)
 */


/*
 * creates a new Propstat
 */
Propstat* propstat_create(pool_handle_t *pool);


/*
 * adds a property to the propstat map
 * 
 * propstat:  propstat object
 * status:    http status code
 * prop:      WebDAV property
 */
void propstat_add(Propstat *propstat, int status, XmlElement *prop);

/*
 * writes the propstat object to an output buffer
 * if wv is true, it writes the values of the 'OK' properties
 * 
 * propstat:  propstat object
 * out:       output buffer
 * wv:        property output mode
 */
void propstat_write(Propstat *propstat, Buffer *out, int wv);



#ifdef	__cplusplus
}
#endif

#endif	/* WS_WEBDAV_H */