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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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../ucx/string.h"
#include "../ucx/dlist.h"
#include "../util/pool.h"

#include "saxhandler.h"

using namespace std;

void xstack_push(UcxDlist **stack, XmlElement *elm) {
    *stack = ucx_dlist_prepend(*stack, elm);
}

XmlElement* xstack_pop(UcxDlist **stack) {
    if(*stack == NULL) {
        return NULL;
    }
    XmlElement* ret = (XmlElement*)(*stack)->data;
    UcxDlist *newstack = ucx_dlist_remove(*stack, *stack);
    *stack = newstack;
    return ret;
}



PropfindHandler::PropfindHandler(PropfindRequest *rq, pool_handle_t *p) {
    davrq = rq;
    pool  = p;

    davPropTag = false;
    property = NULL;
}

PropfindHandler::~PropfindHandler() {
    
}

void PropfindHandler::startElement(
        const XMLCh *const uri,
        const XMLCh* const localname,
        const XMLCh* const qname,
        const Attributes& attrs)
{
    char *ns  = XMLString::transcode(uri);
    char *name = XMLString::transcode(localname);
    
    if(!strcmp(ns, "DAV:") && !strcmp(name, "prop")) {
        davPropTag = true;
    } else if(davPropTag && property == NULL) {
        //property = (DavProperty*)pool_malloc(pool, sizeof(DavProperty));
        property = (DavProperty*)malloc(sizeof(DavProperty));
        /* Ultra TODO: pool_malloc makes big mistakes!! */

        size_t nslen = strlen(ns);
        size_t namelen = strlen(name);
        if(nslen > 0) {
            property->xmlns = (char*)pool_malloc(pool, nslen + 1);
            property->xmlns[nslen] = 0;
            memcpy(property->xmlns, ns, nslen);
        } else {
            property->xmlns = NULL;
        }

        if(namelen > 0) {
            property->name = (char*)pool_malloc(pool, namelen + 1);
            property->name[namelen] = 0;
            memcpy(property->name, name, namelen);
        } else {
            property->name = NULL;
        }
    }

    XMLString::release(&ns);
    XMLString::release(&name);
}


void PropfindHandler::endElement(
        const XMLCh* const   uri,
        const XMLCh* const   localname,
        const XMLCh* const   qname)
{
    char *ns  = XMLString::transcode(uri);
    char *name = XMLString::transcode(localname);

    if(property != NULL) {
        const char *xmlns = (property->xmlns) ? property->xmlns : "";
        
        if(!strcmp(ns, xmlns) && !strcmp(name, property->name)) {
            // add property to DavRequest
            UcxDlist *elm = (UcxDlist*)pool_malloc(pool, sizeof(UcxDlist));
            elm->prev = NULL;
            elm->next = NULL;
            elm->data = property;
            //printf("saxhandler: add property: {%s}\n", property->name);
            davrq->properties = ucx_dlist_concat(davrq->properties, elm);
            
            property = NULL;
        }
    }

    XMLString::release(&ns);
    XMLString::release(&name);
}

void PropfindHandler::startDocument() {
    
}

void PropfindHandler::endDocument() {

}


/************* PropPatch Handler **************/

ProppatchHandler::ProppatchHandler(ProppatchRequest *rq, pool_handle_t *p) {
    davrq = rq;
    pool  = p;
    
    davPropTag = false;
    rootElement = NULL;
    xmlStack = NULL;
    newElement = NULL;
    
    updateMode = -1;
}

ProppatchHandler::~ProppatchHandler() {
    
}

void ProppatchHandler::startElement(
        const XMLCh *const uri,
        const XMLCh* const localname,
        const XMLCh* const qname,
        const Attributes& attrs)
{
    char *ns  = XMLString::transcode(uri);
    char *name = XMLString::transcode(localname);
    
    if(!strcmp(ns, "DAV:") && !strcmp(name, "set")) {
        updateMode = 0;
    } else if(!strcmp(ns, "DAV:") && !strcmp(name, "remove")) {
        updateMode = 1;
    } else if(!strcmp(ns, "DAV:") && !strcmp(name, "prop")) {
        davPropTag = true;
    } else if(davPropTag) {
        newElement = (XmlElement*)pool_calloc(pool, 1, sizeof(XmlElement));
        newElement->name = sstr(pool_strdup(pool, name));
        newElement->xmlns = xmlnsmap_put(davrq->nsmap, ns);
        
        /*
         * the xml stack manages the xml hierarchy
         * new elements will be added to the top element on the stack
         */
        
        XmlElement *currentElm = XSTACK_CUR();
        if(currentElm) {
            xmlelm_add_child(currentElm, newElement);
        }
        
        /* newElement is now the parent for future elements */
        XSTACK_PUSH(newElement);
        
        /* if the root element isn't set, the first new element is the root */
        if(!rootElement) {
            rootElement = newElement;
        }
    }

    XMLString::release(&ns);
    XMLString::release(&name);
}


void ProppatchHandler::endElement(
        const XMLCh* const   uri,
        const XMLCh* const   localname,
        const XMLCh* const   qname)
{
    char *ns  = XMLString::transcode(uri);
    char *name = XMLString::transcode(localname);

    if(!strcmp(ns, "DAV:") && !strcmp(name, "set")) {
        updateMode = -1;
    } else if(!strcmp(ns, "DAV:") && !strcmp(name, "remove")) {
        updateMode = -1;
    } else if(!strcmp(ns, "DAV:") && !strcmp(name, "prop")) {
        davPropTag = false;
    } else if(davPropTag) {
        XmlElement *elm = XSTACK_POP();
        if(xmlStack == NULL) {
            /* property complete */
            
            /*
            XmlElement *r = rootElement;
            printf("<%s>\n", sstrdup(r->name).ptr);
            printf("%s\n", r->content);
            printf("</%s>\n", sstrdup(r->name).ptr);
            */
            
            /* add the property to the proppatch request */
            switch(updateMode) {
                case 0: {
                    davrq->setProps = ucx_dlist_append(
                            davrq->setProps,
                            rootElement);
                    break;
                }
                case 1: {
                    davrq->removeProps = ucx_dlist_append(
                            davrq->removeProps,
                            rootElement);
                    break;
                }
            }
            
            rootElement = NULL;
            
        }
    }
    

    XMLString::release(&ns);
    XMLString::release(&name);
}

void ProppatchHandler::characters(
        const XMLCh *const chars,
        const XMLSize_t length)
{
    
    XMLString::trim((XMLCh *const)chars);
    if(chars[0] == 0) {
        return;
    }
    
    XmlElement *currentElm = XSTACK_CUR();
    if(currentElm) {
        xmlch_t *str = (xmlch_t*)pool_calloc(pool, sizeof(xmlch_t), length + 1);
        for(int i=0;i<length;i++) {
            str[i] = chars[i];
        }
        
        currentElm->content = str;
        currentElm->ctlen = length;
    }
}

void ProppatchHandler::startDocument() {
    
}

void ProppatchHandler::endDocument() {

}