/**
 * Debug configuration implementation
 * Runtime debug configuration system for flexible debug output control
 */

#include "debug_config.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>

/* Global debug configuration */
debug_config_t g_debug_config = {
    .level = DEBUG_LEVEL_ERROR,
    .categories = DEBUG_CATEGORY_ALL,
    .timestamp_enabled = 1,
    .function_name_enabled = 1,
    .file_line_enabled = 1,
    .color_enabled = 1,
    .max_output_per_second = 0,
    .output_file = NULL
};

/* Output file handle */
FILE* debug_output_file = NULL;

/* Rate limiting */
static size_t output_count = 0;
static time_t last_output_time = 0;
static pthread_mutex_t debug_mutex = PTHREAD_MUTEX_INITIALIZER;

/* ANSI color codes */
static const char* color_red = "\033[31m";
static const char* color_yellow = "\033[33m";
static const char* color_green = "\033[32m";
static const char* color_blue = "\033[34m";
static const char* color_magenta = "\033[35m";
static const char* color_cyan = "\033[36m";
static const char* color_reset = "\033[0m";

/* Initialize debug system with default settings */
void debug_config_init(void) {
    pthread_mutex_lock(&debug_mutex);
    
    g_debug_config.level = DEBUG_LEVEL_ERROR;
    g_debug_config.categories = DEBUG_CATEGORY_ALL;
    g_debug_config.timestamp_enabled = 1;
    g_debug_config.function_name_enabled = 1;
    g_debug_config.file_line_enabled = 1;
    g_debug_config.color_enabled = 1;
    g_debug_config.max_output_per_second = 0;
    g_debug_config.output_file = NULL;
    
    if (debug_output_file && debug_output_file != stderr && debug_output_file != stdout) {
        fclose(debug_output_file);
    }
    debug_output_file = stderr;
    
    output_count = 0;
    last_output_time = 0;
    
    pthread_mutex_unlock(&debug_mutex);
}

/* Set debug level */
void debug_set_level(debug_level_t level) {
    pthread_mutex_lock(&debug_mutex);
    g_debug_config.level = level;
    pthread_mutex_unlock(&debug_mutex);
}

/* Enable/disable specific categories */
void debug_enable_category(debug_category_t category) {
    pthread_mutex_lock(&debug_mutex);
    g_debug_config.categories |= category;
    pthread_mutex_unlock(&debug_mutex);
}

void debug_disable_category(debug_category_t category) {
    pthread_mutex_lock(&debug_mutex);
    g_debug_config.categories &= ~category;
    pthread_mutex_unlock(&debug_mutex);
}

void debug_set_categories(uint32_t categories) {
    pthread_mutex_lock(&debug_mutex);
    g_debug_config.categories = categories;
    pthread_mutex_unlock(&debug_mutex);
}

/* Configure output options */
void debug_enable_timestamp(int enable) {
    pthread_mutex_lock(&debug_mutex);
    g_debug_config.timestamp_enabled = enable;
    pthread_mutex_unlock(&debug_mutex);
}

void debug_enable_function_name(int enable) {
    pthread_mutex_lock(&debug_mutex);
    g_debug_config.function_name_enabled = enable;
    pthread_mutex_unlock(&debug_mutex);
}

void debug_enable_file_line(int enable) {
    pthread_mutex_lock(&debug_mutex);
    g_debug_config.file_line_enabled = enable;
    pthread_mutex_unlock(&debug_mutex);
}

void debug_enable_color(int enable) {
    pthread_mutex_lock(&debug_mutex);
    g_debug_config.color_enabled = enable;
    pthread_mutex_unlock(&debug_mutex);
}

void debug_set_rate_limit(size_t max_per_second) {
    pthread_mutex_lock(&debug_mutex);
    g_debug_config.max_output_per_second = max_per_second;
    pthread_mutex_unlock(&debug_mutex);
}

void debug_set_output_file(const char* file_path) {
    pthread_mutex_lock(&debug_mutex);
    
    if (file_path == NULL) {
        if (debug_output_file && debug_output_file != stderr && debug_output_file != stdout) {
            fclose(debug_output_file);
        }
        debug_output_file = stderr;
        g_debug_config.output_file = NULL;
    } else {
        FILE* new_file = fopen(file_path, "a");
        if (new_file) {
            if (debug_output_file && debug_output_file != stderr && debug_output_file != stdout) {
                fclose(debug_output_file);
            }
            debug_output_file = new_file;
            g_debug_config.output_file = file_path;
        }
    }
    
    pthread_mutex_unlock(&debug_mutex);
}

/* Check if debug output should be shown for given level and category */
int debug_should_output(debug_level_t level, debug_category_t category) {
    pthread_mutex_lock(&debug_mutex);
    
    /* Check if category is enabled */
    if (!(g_debug_config.categories & category)) {
        pthread_mutex_unlock(&debug_mutex);
        return 0;
    }
    
    /* Check if level is sufficient */
    if (level > g_debug_config.level) {
        pthread_mutex_unlock(&debug_mutex);
        return 0;
    }
    
    /* Rate limiting check */
    if (g_debug_config.max_output_per_second > 0) {
        time_t current_time = time(NULL);
        if (current_time != last_output_time) {
            output_count = 0;
            last_output_time = current_time;
        }
        
        if (output_count >= g_debug_config.max_output_per_second) {
            pthread_mutex_unlock(&debug_mutex);
            return 0;
        }
        output_count++;
    }
    
    pthread_mutex_unlock(&debug_mutex);
    return 1;
}

/* Get current debug level for a category */
debug_level_t debug_get_effective_level(debug_category_t category) {
    pthread_mutex_lock(&debug_mutex);
    debug_level_t level = g_debug_config.level;
    pthread_mutex_unlock(&debug_mutex);
    return level;
}

/* Get color for debug level */
static const char* get_level_color(debug_level_t level) {
    if (!g_debug_config.color_enabled) {
        return "";
    }
    
    switch (level) {
        case DEBUG_LEVEL_ERROR: return color_red;
        case DEBUG_LEVEL_WARN:  return color_yellow;
        case DEBUG_LEVEL_INFO:  return color_green;
        case DEBUG_LEVEL_DEBUG: return color_blue;
        case DEBUG_LEVEL_TRACE: return color_magenta;
        default: return "";
    }
}

/* Get level name */
static const char* get_level_name(debug_level_t level) {
    switch (level) {
        case DEBUG_LEVEL_ERROR: return "ERROR";
        case DEBUG_LEVEL_WARN:  return "WARN";
        case DEBUG_LEVEL_INFO:  return "INFO";
        case DEBUG_LEVEL_DEBUG: return "DEBUG";
        case DEBUG_LEVEL_TRACE: return "TRACE";
        default: return "UNKNOWN";
    }
}

/* Format and output debug message */
void debug_output(debug_level_t level, debug_category_t category, 
                 const char* function, const char* file, int line,
                 const char* format, ...) {
    
    pthread_mutex_lock(&debug_mutex);
    
    va_list args;
    FILE* output = debug_output_file ? debug_output_file : stderr;
    
    /* Print timestamp if enabled */
    if (g_debug_config.timestamp_enabled) {
        time_t now = time(NULL);
        struct tm* tm_info = localtime(&now);
        char time_str[32];
        strftime(time_str, sizeof(time_str), "%Y-%m-%d %H:%M:%S", tm_info);
        fprintf(output, "[%s] ", time_str);
    }
    
    /* Print level and color */
    if (g_debug_config.color_enabled) {
        fprintf(output, "%s[%s]%s ", get_level_color(level), get_level_name(level), color_reset);
    } else {
        fprintf(output, "[%s] ", get_level_name(level));
    }
    
    /* Print category */
    fprintf(output, "[%d] ", category);
    
    /* Print function name if enabled */
    if (g_debug_config.function_name_enabled && function) {
        fprintf(output, "%s() ", function);
    }
    
    /* Print file:line if enabled */
    if (g_debug_config.file_line_enabled && file) {
        fprintf(output, "(%s:%d) ", file, line);
    }
    
    /* Print the actual message */
    va_start(args, format);
    vfprintf(output, format, args);
    va_end(args);
    
    fprintf(output, "\n");
    fflush(output);
    
    pthread_mutex_unlock(&debug_mutex);
}

/* Stub implementations for advanced features */
int debug_parse_config(const char* config_string) {
    /* Simple parser - for now just return success */
    return 0;
}

int debug_parse_config_file(const char* file_path) {
    /* Stub implementation */
    return 0;
}

int debug_enable_config_reload(const char* file_path, int interval_seconds) {
    /* Stub implementation */
    return 0;
}