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/* $Id$ */

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/** @file ai_error.cpp Implementation of AIError. */

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#include "ai_error.hpp"

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#include "table/strings.h"

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#include "../../core/bitmath_func.hpp"

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AIError::AIErrorMap AIError::error_map = AIError::AIErrorMap();

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AIError::AIErrorMapString AIError::error_map_string = AIError::AIErrorMapString();

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/* static */ AIErrorType AIError::GetLastError()

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{

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	return AIObject::GetLastError();

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}

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/* static */ const char *AIError::GetLastErrorString()

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{

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	return (*error_map_string.find(AIError::GetLastError())).second;

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}

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/* static */ AIErrorType AIError::StringToError(StringID internal_string_id)

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{

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	uint index = GB(internal_string_id, 11, 5);

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	switch (GB(internal_string_id, 11, 5)) {

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		case 26: case 28: case 29: case 30: // NewGRF strings.

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			return ERR_NEWGRF_SUPPLIED_ERROR;

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		/* DO NOT SWAP case 14 and 4 because that will break StringToError due

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		 * to the index dependency that relies on FALL THROUGHs. */

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		case 14: if (index < 0xE4) break; // Player name

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		case 4:  if (index < 0xC0) break; // Town name

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		case 15: // Custom name

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		case 31: // Dynamic strings

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			/* These strings are 'random' and have no meaning.

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			 * They actually shouldn't even be returned as error messages. */

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			return ERR_UNKNOWN;

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		default:

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			break;

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	}

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	AIErrorMap::iterator it = error_map.find(internal_string_id);

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	if (it == error_map.end()) return ERR_UNKNOWN;

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	return (*it).second;

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}

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/* static */ void AIError::RegisterErrorMap(StringID internal_string_id, AIErrorType ai_error_msg)

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{

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	error_map[internal_string_id] = ai_error_msg;

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}

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/* static */ void AIError::RegisterErrorMapString(AIErrorType ai_error_msg, const char *message)

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{

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	error_map_string[ai_error_msg] = message;

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}

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/* static */ AIError::ErrorCategories AIError::GetErrorCategory() {

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	return (AIError::ErrorCategories)(GetLastError() >> (uint)ERR_CAT_BIT_SIZE);

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}