/*
 * Copyright 2023 Oleg Borodin  <borodin@unix7.org>
 */

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

#include <cfparser.h>
#include <logger.h>


#define INIT_BSIZE 64


static char* strcopy(char* src) {
    size_t srcsize = strlen(src) + 1;
    char* dst = malloc(srcsize);

    memset(dst, '\0', srcsize);
    strcpy(dst, src);
    return dst;
}

#if 0
static char* strconcat(char** str, int num) {
    size_t tsize = 0;
    size_t size[num];

    for (int i = 0; i < num; i++) {
        size[i] = 0;
        if (str[i] != NULL) {
            size[i] = strlen(str[i]);
            tsize += size[i];
        }
    }
    tsize++;
    char* dst = malloc(tsize);

    memset(dst, '\0', tsize);
    int pos = 0;

    for (int i = 0; i < num; i++) {
        if (str[i] != NULL) {
            strcpy(&dst[pos], str[i]);
            pos += size[i];
        }
    }
    return dst;
}
#endif


void cfparser_init(cfparser_t * parser, cflexer_t * lexer) {
    parser->lexer = lexer;
    parser->kvalarr = malloc(sizeof(cfkval_t) * INIT_BSIZE);
    parser->kvalcapa = INIT_BSIZE;
    parser->kvalsize = 0;
}

int cfparser_bind(cfparser_t * parser, int type, char* key, void* ref) {
    for (int i = 0; i < parser->kvalsize; i++) {
            if (strcmp(key, parser->kvalarr[i].key) == 0) {
                char* key = parser->kvalarr[i].key;
                char* val = parser->kvalarr[i].val;
                switch (type) {
                    case CFVALTYPE_STR: {
                        *(char**)(ref) = strcopy(val);
                        break;
                    }
                    case CFVALTYPE_INT: {
                        for (size_t i = 0; i < strlen(val); i++) {
                            if (isdigit(val[i]) == 0 && val[i] != '-' ) {
                                log_error("wrong integer value: %s = %s", key, val);
                                return -1;
                            }
                        }
                        char* eptr = NULL;
                        *(int64_t*)(ref) = (int64_t)strtol(val, &eptr, 10);
                        break;
                    }
                    case CFVALTYPE_BOOL:{
                        *(bool*)(ref) = false;
                        if (strcmp(val, "true") == 0) {
                            *(bool*)(ref) = true;
                        } else if (strcmp(val, "false") == 0) {
                            *(bool*)(ref) = false;
                        } else {
                            log_error("wrong boolean key value: %s = %s", key, val);
                        }
                        break;
                    }

                }
            }
    }
    return 0;
}

#define MAX_TOKEN_SIZE 1024


int cfparser_parse(cfparser_t * parser) {
    cflexer_t* lex = parser->lexer;

    char token[MAX_TOKEN_SIZE];
    int type = 0;
    int pos = 0;

    char* key;
    //char* val;

    while ((type = cflexer_gettoken(lex, token)) != CFLEXTOK_END) {
        switch (pos) {
                // POS 0
            case 0:{
                if (type == CFLEXTOK_SPACE) continue;
                if (type == CFLEXTOK_COMM) continue;
                if (type == CFLEXTOK_NEXT) continue;
                if (type == CFLEXTOK_WORD) {
                    key = strcopy(token);
                    pos++;
                } else {
                    return -1;
                }
                break;
            }
                // POS 1
            case 1:{
                if (type == CFLEXTOK_SPACE) continue;
                 if (type == CFLEXTOK_SEPAR) {
                    pos++;
                } else {
                    return -1;
                }
                break;
            }
                // POS 2
            case 2:{
                if (type == CFLEXTOK_SPACE) continue;
                 if (type == CFLEXTOK_WORD) {
                    char* val = strcopy(token);
                    if (parser->kvalsize >= parser->kvalcapa) {
                        // TODO
                    }
                    parser->kvalarr[parser->kvalsize].key = key;
                    parser->kvalarr[parser->kvalsize].val = val;
                    parser->kvalsize++;
                    pos++;
                } else {
                    return -1;
                }
                break;
            }
            case 3:{
                if (type == CFLEXTOK_SPACE) continue;
                if (type == CFLEXTOK_COMM) continue;
                if (type == CFLEXTOK_NEXT) {
                    pos = 0;
                } else {
                    return -1;
                }
                break;
            }
            default:{
                return -1;
            }
        }
    }
    return 0;
}


void cfparser_destroy(cfparser_t * parser) {
    if (parser == NULL) return;
    if (parser->kvalarr != NULL) {
        for (int i = 0; i < parser->kvalsize; i++) {
            free(parser->kvalarr[i].key);
            free(parser->kvalarr[i].val);
        }
        free(parser->kvalarr);
    }
}