#ifndef PARCEL_LOGGER_H
#define PARCEL_LOGGER_H

#include <utility.h>

typedef enum
{
    PAC_SYNTAX_ERROR,
    PAC_NAMING_ERROR,
    PAC_VALIDATION_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_INVALID_ITEM

} pac_syntax_error_e;

typedef enum
{
    PAC_NAMING_ERROR_INVALID_REFERENCE_NAME,
    PAC_NAMING_ERROR_INVALID_RULE_NAME

} pac_naming_error_e;

typedef enum
{
    PAC_VALIDATION_ERROR_UNKNOWN_RULE,
    PAC_VALIDATION_ERROR_RULE_NAMING_CONFLICT,
    PAC_VALIDATION_ERROR_VARIANT_DUPLICATION,
    PAC_VALIDATION_ERROR_CIRCULAR_REFERENCE
    
} pac_validation_error_e;

typedef enum
{
    PAC_INTERNAL_ERROR_INVALID_ARGUMENTS,
    PAC_INTERNAL_ERROR_INVALID_RETURNED_STATUS,
    PAC_INTERNAL_ERROR_INVALID_FUNCTION_ENTRY,
    PAC_INTERNAL_ERROR_NOT_IMPLEMENTED

} pac_internal_error_e;

typedef struct pac_source_location
{
    char                       *file;
    usz_t                       line;
    usz_t                       column;

    char                       *rule;
    usz_t                       variant_index;
    usz_t                       item_index;

} pac_source_location_s;

typedef struct pac_syntax_error
{
    pac_source_location_s       location;
    
    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                       *present_token;
            char                       *hint;
        } odd_token;

        struct pac_syntax_error_invalid_item
        {
            char                       *present_construct;
            char                       *hint;

        } invalid_item;

    } 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_validation_error
{
    char                       *rule;
    usz_t                       variant;

    pac_validation_error_e      type;
    union pac_validation_error_specifics
    {
        struct pac_naming_error_unknown_rule
        {
            char                       *searched_name;

        } unknown_rule;

        struct pac_naming_error_rule_naming_conflict
        {
            char                       *rule_name;
            usz_t                       original_line;
            usz_t                       duplicate_line;

        } rule_naming_conflict;

        struct pac_naming_error_variant_duplication
        {
            char                       *rule_name;
            usz_t                       original;
            usz_t                       duplicate;

        } variant_doubling;

    } specifics;

} pac_validation_error_s;

typedef struct pac_internal_error
{
    pac_internal_error_e        type;
    union pac_internal_error_specifics
    {
        struct pac_internal_error_invalid_arguments
        {
            char                       *argument;
            char                       *value;
            char                       *error_description;

        } invalid_arguments;
        
        struct pac_internal_error_invalid_returned_status
        {
            char                       *function;
            char                       *immediate_returner;
            char                       *value;

        } invalid_returned_status;

        struct pac_internal_error_invalid_function_entry
        {
            char                       *function;
            char                       *error_description;

        } invalid_function_entry;

        struct pac_internal_error_not_implemented
        {
            char                       *feature_name;
            char                       *feature_description;

        } not_implemented;

    } specifics;

} pac_internal_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;
        pac_validation_error_s      validation_error;
        pac_internal_error_s        internal_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_delete_logger               (pac_logger_s 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_validation_error        (pac_logger_s *logger, pac_validation_error_s error);
void                        pac_log_internal_error          (pac_logger_s *logger, pac_internal_error_s error);

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

#endif // PARCEL_LOGGER_H