#include "debug.h"
#include <stdarg.h>
#include <string.h>

/**
 * @file debug.c
 * @brief Debug and logging system implementation
 *
 * Provides a configurable logging system with timestamp formatting,
 * level-based filtering, and optional file:line information.
 */

// Global debug level (default: no debug output)
debug_level_t g_debug_level = DEBUG_LEVEL_NONE;

/**
 * @brief Initialize the debug system with a specific level
 * @param level Debug level (0-5, clamped to valid range)
 */
void debug_init(int level) {
    if (level < 0) level = 0;
    if (level > 5) level = 5;
    g_debug_level = (debug_level_t)level;
}

/**
 * @brief Core logging function
 * @param level Debug level for this message
 * @param file Source file name (__FILE__)
 * @param line Source line number (__LINE__)
 * @param format printf-style format string
 * @param ... Variable arguments for format string
 */
void debug_log(debug_level_t level, const char* file, int line, const char* format, ...) {
    // Get timestamp
    time_t now = time(NULL);
    struct tm* tm_info = localtime(&now);
    char timestamp[32];
    strftime(timestamp, sizeof(timestamp), "%Y-%m-%d %H:%M:%S", tm_info);

    // Get level string
    const char* level_str = "UNKNOWN";
    switch (level) {
        case DEBUG_LEVEL_ERROR: level_str = "ERROR"; break;
        case DEBUG_LEVEL_WARN:  level_str = "WARN "; break;
        case DEBUG_LEVEL_INFO:  level_str = "INFO "; break;
        case DEBUG_LEVEL_DEBUG: level_str = "DEBUG"; break;
        case DEBUG_LEVEL_TRACE: level_str = "TRACE"; break;
        default: break;
    }

    // Print prefix with timestamp and level
    printf("[%s] [%s] ", timestamp, level_str);

    // Print source location when debug level is TRACE (5) or higher
    if (file && g_debug_level >= DEBUG_LEVEL_TRACE) {
        // Extract just the filename (not full path)
        const char* filename = strrchr(file, '/');
        filename = filename ? filename + 1 : file;
        printf("[%s:%d] ", filename, line);
    }

    // Print message
    va_list args;
    va_start(args, format);
    vprintf(format, args);
    va_end(args);

    printf("\n");
    fflush(stdout);
}