/**
 * @file debug.c
 * @brief Debug and logging implementation for Baba Yaga
 * @author eli_oat
 * @version 0.0.1
 * @date 2025
 * 
 * This file implements debug and logging functionality for the Baba Yaga language.
 */

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

#include "baba_yaga.h"

/* ============================================================================
 * Debug State
 * ============================================================================ */

static DebugLevel current_debug_level = DEBUG_NONE;

/* ============================================================================
 * Debug Functions
 * ============================================================================ */

/**
 * @brief Set debug level
 * 
 * @param level Debug level to set
 */
void baba_yaga_set_debug_level(DebugLevel level) {
    current_debug_level = level;
}

/**
 * @brief Get current debug level
 * 
 * @return Current debug level
 */
DebugLevel baba_yaga_get_debug_level(void) {
    return current_debug_level;
}

/**
 * @brief Get debug level name
 * 
 * @param level Debug level
 * @return String representation of debug level
 */
static const char* debug_level_name(DebugLevel level) {
    switch (level) {
    case DEBUG_NONE: return "NONE";
    case DEBUG_ERROR: return "ERROR";
    case DEBUG_WARN: return "WARN";
    case DEBUG_INFO: return "INFO";
    case DEBUG_DEBUG: return "DEBUG";
    case DEBUG_TRACE: return "TRACE";
    default: return "UNKNOWN";
    }
}

/**
 * @brief Get current timestamp
 * 
 * @return Current timestamp as string
 */
static const char* get_timestamp(void) {
    static char timestamp[32];
    time_t now = time(NULL);
    struct tm* tm_info = localtime(&now);
    strftime(timestamp, sizeof(timestamp), "%H:%M:%S", tm_info);
    return timestamp;
}

/**
 * @brief Debug logging function
 * 
 * @param level Debug level for this message
 * @param file Source file name
 * @param line Line number
 * @param func Function name
 * @param format Format string
 * @param ... Variable arguments
 */
void baba_yaga_debug_log(DebugLevel level, const char* file, int line, 
                        const char* func, const char* format, ...) {
    if (level > current_debug_level) {
        return;
    }
    
    /* Get file name without path */
    const char* filename = strrchr(file, '/');
    if (filename == NULL) {
        filename = file;
    } else {
        filename++; /* Skip the '/' */
    }
    
    /* Print timestamp and level */
    fprintf(stderr, "[%s] %-5s ", get_timestamp(), debug_level_name(level));
    
    /* Print location */
    fprintf(stderr, "%s:%d:%s(): ", filename, line, func);
    
    /* Print message */
    va_list args;
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
    
    fprintf(stderr, "\n");
    fflush(stderr);
}