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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 <stdlib.h>
#include <cx/map.h>
#include <cx/hash_map.h>

#include "../public/nsapi.h"
#include "../util/pblock.h"

#include "func.h"

CxMap *function_map;

void func_init() {
    function_map = cxHashMapCreate(cxDefaultAllocator, 256);
}

void add_function(FuncStruct *func) {
    struct FuncStruct *f = malloc(sizeof(FuncStruct));
    *f = *func;
    char *name = strdup(func->name);
    for(int i=0;name[i]!='\0';i++) {
        if(name[i] == '_') {
            name[i] = '-';
        }
    }
    f->name = name;
    log_ereport(LOG_VERBOSE, "add_function %s", f->name);
    cxMapPut(function_map, cx_hash_key_str(f->name), f);
}

void add_functions(FuncStruct *funcs) {
    int i = 0;
    while(funcs[i].func != NULL) {  
        add_function(&funcs[i]);
        i++;
    }
}

FuncStruct* get_function(const char *name) {
    char *name_dup = strdup(name);
    for(int i=0;name_dup[i]!='\0';i++) {
        if(name_dup[i] == '_') {
            name_dup[i] = '-';
        }
    }
    void *ret = cxMapGet(function_map, cx_hash_key_str(name_dup));
    free(name_dup);
    return ret;
}

FuncStruct* func_resolve(pblock *pb, Session *sn, Request *rq) {
    char *name = pblock_findkeyval(pb_key_fn, pb);
    if(name == NULL) {
        // TODO: error
        return NULL;
    }

    FuncStruct *func = get_function(name);
    if(func == NULL) {
        // TODO: error
    }
    return func;
}

int func_exec(pblock *pb, Session *sn, Request *rq) {
    FuncStruct *func = func_resolve(pb, sn, rq);
    if(func == NULL) {
        return REQ_ABORTED;
    }
    return func->func(pb, sn, rq);
}




// public API

struct FuncStruct func_insert(char *name, FuncPtr fn) {
    struct FuncStruct fc;
    ZERO(&fc, sizeof(FuncStruct));
    fc.func = fn;
    fc.name = strdup(name);
    add_function(&fc);
    return *get_function(name);
}