#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "rifle/symbol.h"

int
symbol_table_init(struct symbol_table *table)
{
    if (table == NULL) {
        return -1;
    }

    table->symbol_count = 0;
    TAILQ_INIT(&table->entries);
    return 0;
}

void
symbol_table_destroy(struct symbol_table *table)
{
    struct symbol *symbol;

    if (table == NULL) {
        return;
    }

    symbol = TAILQ_FIRST(&table->entries);
    while (symbol != NULL) {
        TAILQ_REMOVE(&table->entries, symbol, link);
        free(symbol->name);
        free(symbol);
        symbol = TAILQ_FIRST(&table->entries);
    }
}

struct symbol *
symbol_from_name(struct symbol_table *table, const char *name)
{
    struct symbol *symbol;

    if (table == NULL || name == NULL) {
        return NULL;
    }

    TAILQ_FOREACH(symbol, &table->entries, link) {
        if (*symbol->name != *name) {
            continue;
        }

        if (strcmp(symbol->name, name) == 0) {
            return symbol;
        }
    }

    return NULL;
}

int
symbol_new(struct symbol_table *table, const char *name, symtype_t type,
    struct symbol **res)
{
    struct symbol *symbol;

    if (table == NULL || name == NULL) {
        return -1;
    }

    if ((symbol = malloc(sizeof(*symbol))) == NULL) {
        return -1;
    }

    /* Initialize the symbol itself */
    memset(symbol, 0, sizeof(*symbol));
    symbol->name = strdup(name);
    symbol->type = type;

    /* Add symbol to symbol table */
    ++table->symbol_count;
    TAILQ_INSERT_TAIL(&table->entries, symbol, link);

    if (res != NULL) {
        *res = symbol;
    }

    return 0;
}