#pragma once

#include <math.trait.hfa>


// *********************************** initial declarations ***********************************


struct config_entry {
	const char * key;
	void * variable;
	bool (*parse)( const char *, void * );
	bool (*validate)( void * );
};

bool null_validator( void * ) { return true; }

static inline void ?{}( config_entry & this ) {}

forall(T & | { bool parse( const char *, T & ); })
static inline void ?{}( config_entry & this, const char * key, T & variable ) {
	this.key      = key;
	this.variable = (void *)&variable;
	this.parse    = (bool (*)(const char *, void *))(bool (*)(const char *, T &))parse;
	this.validate = null_validator;
}

forall(T & | { bool parse( const char *, T & ); })
static inline void ?{}( config_entry & this, const char * key, T & variable, bool (*validate)(T &) ) {
	this.key      = key;
	this.variable = (void *)&variable;
	this.parse    = (bool (*)(const char *, void *))(bool (*)(const char *, T &))parse;
	this.validate = (bool (*)(void *))(bool (*)(T &))validate;
}

forall(T &)
static inline void ?{}( config_entry & this, const char * key, T & variable, bool (*parse)(const char *, T &) ) {
	this.key      = key;
	this.variable = (void *)&variable;
	this.parse    = (bool (*)(const char *, void *))(bool (*)(const char *, T &))parse;
	this.validate = null_validator;
}

forall(T &)
static inline void ?{}( config_entry & this, const char * key, T & variable, bool (*parse)(const char *, T &), bool (*validate)(T &) ) {
	this.key      = key;
	this.variable = (void *)&variable;
	this.parse    = (bool (*)(const char *, void *))(bool (*)(const char *, T &))parse;
	this.validate = (bool (*)(void *))(bool (*)(T &))validate;
}

// TODO: Replace KVPairs with vector2 when it's fully functional
struct KVPairs {
	size_t size, max_size;
	* [ * char, * char ] data;
};

[ void ] add_kv_pair( & KVPairs kv_pairs, [] char key, [] char value );


// *********************************** exceptions ***********************************


exception Missing_Config_Entries {
	unsigned int num_missing;
};

[ void ] msg( * Missing_Config_Entries ex );

exception Parse_Failure {
	* char failed_key;
	* char failed_value;
};

[ void ] msg( * Parse_Failure ex );

exception Validation_Failure {
	* char failed_key;
	* char failed_value;
};

[ void ] msg( * Validation_Failure ex );


// *********************************** main code ***********************************


[ * KVPairs ] parse_tabular_config_format( [] const char config_file, size_t num_entries );

[ void ] parse_config(
	[] const char config_file,
	[] config_entry entries,
	size_t num_entries,
	KVPairs * (*parser)(const char [], size_t)  // TODO: add sensible default parser when resolver bug is fixed
);

bool parse( const char *, const char * & );
bool parse( const char *, int & );
bool parse( const char *, unsigned & );
bool parse( const char *, unsigned long & );
bool parse( const char *, unsigned long long & );
bool parse( const char *, float & );
bool parse( const char *, double & );


// *********************************** validation ***********************************


forall(T | Relational( T ))
[ bool ] is_nonnegative( & T );

forall(T | Relational( T ))
[ bool ] is_positive( & T );

forall(T | Relational( T ))
[ bool ] is_nonpositive( & T );

forall(T | Relational( T ))
[ bool ] is_negative( & T );


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