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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 "objconf.h"

#include <string.h>

/* dev notes:
 *
 * to free ObjectConfig, free:
 *    line dlist
 *    mempool
 *    object
 */

ObjectConfig *load_object_config(char *file) {
    FILE *in = fopen(file, "r");
    if(in == NULL) {
        return NULL;
    }

    ObjectConfig *conf = malloc(sizeof(ObjectConfig));
    conf->parser.parse = objconf_parse;
    conf->file = file;
    conf->conditions = NULL;
    conf->levels = NULL;
    conf->objects = NULL;
    //conf->lines = NULL;

    int r = cfg_parse_basic_file((ConfigParser*)conf, in);
    if(r != 0) {
        // TODO: free
        return NULL;
    }
    
    fclose(in);

    return conf;
}

void free_object_config(ObjectConfig *conf) {
    // free other lists
    if(conf->levels) {
        //ucx_list_free(conf->levels);
    }

    // free mempool
    ucx_mempool_destroy(conf->parser.mp->pool);
    free(conf);
}



int objconf_parse(void *p, ConfigLine *begin, ConfigLine *end, sstr_t line) {
    ObjectConfig *conf = p;

    begin->type = cfg_get_line_type(line);
    switch(begin->type) {
        case LINE_BEGIN_TAG: {
            ConfigTag *tag = cfg_parse_begin_tag(line, conf->parser.mp);
            if(tag == NULL) {
                fprintf(stderr, "Parse error!\n");
                exit(-1); // TODO: better error handling
            }
            tag->begin = begin;
            tag->end = end;
            tag->type_num = cfg_get_tag_type(tag->name);
            //printf("line {%s}\n", sstrdub(ll).ptr);
            if(objconf_on_begin_tag(conf, tag) != 0) {
                fprintf(stderr, "1error\n");
                exit(-1);
            }
            break;
        }
        case LINE_END_TAG: {
            sstr_t tag = cfg_get_end_tag_name(line);
            if(objconf_on_end_tag(conf, tag) != 0) {
                fprintf(stderr, "2error\n");
                exit(-1);
            }

            break;
        }
        case LINE_DIRECTIVE: {
            ConfigDirective *dir = cfg_parse_directive(
                    line,
                    conf->parser.mp);
            dir->begin = begin;
            dir->end = end;
            if(objconf_on_directive(conf, dir) != 0) {
                fprintf(stderr, "3error\n");
                exit(-1);
            }
        }
    }
    return 0;
}

int objconf_on_begin_tag(ObjectConfig *conf, ConfigTag *tag) {
    UcxAllocator *mp = conf->parser.mp;
    if(tag->type_num != TAG_OBJECT) {
        ConfigParserLevel *l = conf->levels->data;
        if(l->tag->type_num != TAG_OBJECT) {
            tag->parent = l->tag;
        }
    }
    

    switch(tag->type_num) {
        case TAG_OBJECT: {
            ConfigObject *obj = OBJ_NEW_N(mp, ConfigObject);
            obj->begin = tag->begin;
            obj->end = tag->end;
            
            obj->name = cfg_param_get(tag->param, sstr("name"));
            obj->ppath = cfg_param_get(tag->param, sstr("ppath"));

            conf->obj = obj;
            conf->objects = ucx_list_append_a(mp, conf->objects, obj);

            // create tree level object
            ConfigParserLevel *lvl = OBJ_NEW(mp, ConfigParserLevel);
            lvl->iftag = NULL;
            lvl->levelnum = 1;
            lvl->tag = tag;
            conf->levels = ucx_list_prepend_a(mp, conf->levels, lvl);

            break;
        }
        case TAG_IF: {
            // create tree level object
            ConfigParserLevel *last_lvl = conf->levels->data;

            ConfigParserLevel *lvl = OBJ_NEW(mp, ConfigParserLevel);
            
            lvl->iftag = NULL;
            lvl->levelnum = last_lvl->levelnum + 1;
            lvl->tag = tag;
            conf->levels = ucx_list_prepend_a(mp, conf->levels, lvl);
            last_lvl->iftag = tag;

            break;
        }
        case TAG_ELSEIF: {
        }
        case TAG_ELSE: {
            // create tree level object
            ConfigParserLevel *last_lvl = conf->levels->data;
            tag->iftag = last_lvl->iftag;

            ConfigParserLevel *lvl = OBJ_NEW(
                    conf->parser.mp,
                    ConfigParserLevel);
            
            lvl->iftag = last_lvl->tag;
            lvl->levelnum = last_lvl->levelnum + 1;
            lvl->tag = tag;
            conf->levels = ucx_list_prepend(conf->levels, lvl);

            break;
        }
        case TAG_CLIENT: {
            // create tree level object
            
            // TODO
            
            break;
        }
        default: {
            printf("unknown tag\n");
            return 1;
        }
    }

    return 0;
}

int objconf_on_end_tag(ObjectConfig *conf, sstr_t tagname) {
    int type = cfg_get_tag_type(tagname);
    if(type == -1) {
        fprintf(stderr, "unknown tag\n");
        return 1;
    } else {
        if(type == TAG_OBJECT) {
            conf->obj = NULL;
        }

        // remove level
        conf->levels = ucx_list_remove_a(
                conf->parser.mp,
                conf->levels,
                conf->levels);
    }
    
    return 0;
}

int objconf_on_directive(ObjectConfig *conf, ConfigDirective *dir) {
    ConfigParserLevel *lvl = conf->levels->data;

    // check if we have a condition for the directive
    // if the level tag is not an object tag, use it as condition
    if(lvl->tag->type_num != TAG_OBJECT) {
        dir->condition = lvl->tag;
    }

    // add directive to current object
    conf->obj->directives[dir->type_num] = ucx_list_append_a(
            conf->parser.mp,
            conf->obj->directives[dir->type_num],
            dir);

    return 0;
}