#ifndef PARCEL_LOGGER_H
#define PARCEL_LOGGER_H

#include <utility.h>

typedef enum
{
    PAC_SYNTAX_ERROR,
    PAC_NAMING_ERROR,
    PAC_INTERNAL_ERROR

} pac_error_e;

typedef enum
{
    PAC_SYNTAX_ERROR_UNSPECIFIED,
    PAC_SYNTAX_ERROR_STRAY,
    PAC_SYNTAX_ERROR_MISSING_TOKEN,
    PAC_SYNTAX_ERROR_ODD_TOKEN

} pac_syntax_error_e;

typedef enum
{
    PAC_RESTRICTED_ERROR_INVALID_RULE_NAME

} pac_naming_error_e;

typedef struct pac_syntax_error
{
    usz_t                       line;
    usz_t                       column;
    
    pac_syntax_error_e          type;
    union pac_syntax_error_specifics
    {
        struct pac_syntax_error_stray
        {
            rune_t                      sign;
        } stray;

        struct pac_syntax_error_missing_token
        {
            char                       *wanted_token;
            char                       *hint;
        } missing_token;

        struct pac_syntax_error_odd_token
        {
            usz_t                       num_valid_options;
            char                       *valid_options[16];
            char                       *found_token;
            char                       *hint;
        } odd_token;

    } specifics;

} pac_syntax_error_s;

typedef struct pac_naming_error
{
    usz_t                       line;
    usz_t                       column;
    
    pac_naming_error_e          type;
    union pac_naming_error_specifics
    {
        struct pac_naming_error_invalid_rule_name
        {
            char                       *given_rule_name;
        } invalid_rule_name;
    } specifics;

} pac_naming_error_s;


typedef struct pac_error
{
    pac_error_e                 type;
    union pac_error_data
    {
        pac_syntax_error_s          syntax_error;
        pac_naming_error_s          naming_error;
    } specifics;

} pac_error_s;

typedef struct pac_logger
{
    usz_t                       allocated_errors;
    usz_t                       num_errors;
    pac_error_s                *errors;

    pac_arena_s                 string_arena;

} pac_logger_s;

pac_logger_s                pac_create_logger               ();
void                        pac_log_syntax_error            (pac_logger_s *logger, pac_syntax_error_s error);
void                        pac_log_naming_error            (pac_logger_s *logger, pac_naming_error_s error);

void *                      pac_log_alloc                   (pac_logger_s *logger, usz_t num_bytes);

#endif // PARCEL_LOGGER_H