const c = @import("c.zig");
const Encoding = @import("types.zig").Encoding;

/// Maximum error message length.
pub const MAX_ERROR_LEN = c.ONIG_MAX_ERROR_MESSAGE_LEN;

/// Convert an Oniguruma error to an error.
pub fn convertError(code: c_int) !c_int {
    if (code >= 0) return code;
    inline for (error_code_map) |m| {
        if (m[1] == code) return m[0];
    }

    return Error.Unknown;
}

/// Convert an error code to a string. buf must be at least
/// MAX_ERROR_LEN bytes long.
pub fn errorString(buf: []u8, code: c_int) ![]u8 {
    const len = c.onig_error_code_to_str(buf.ptr, code);
    return buf[0..@intCast(len)];
}

/// The Oniguruma error info type, matching the C type exactly.
pub const ErrorInfo = extern struct {
    encoding: *Encoding,
    par: [*]u8,
    par_end: [*]u8,
};

/// All possible Oniguruma errors.
pub const Error = error{
    Mismatch,
    NoSupportConfig,
    Abort,
    Memory,
    TypeBug,
    ParserBug,
    StackBug,
    UndefinedBytecode,
    UnexpectedBytecode,
    MatchStackLimitOver,
    ParseDepthLimitOver,
    RetryLimitInMatchOver,
    RetryLimitInSearchOver,
    SubexpCallLimitInSearchOver,
    DefaultEncodingIsNotSet,
    SpecifiedEncodingCantConvertToWideChar,
    FailToInitialize,
    InvalidArgument,
    EndPatternAtLeftBrace,
    EndPatternAtLeftBracket,
    EmptyCharClass,
    PrematureEndOfCharClass,
    EndPatternAtEscape,
    EndPatternAtMeta,
    EndPatternAtControl,
    MetaCodeSyntax,
    ControlCodeSyntax,
    CharClassValueAtEndOfRange,
    CharClassValueAtStartOfRange,
    UnmatchedRangeSpecifierInCharClass,
    TargetOfRepeatOperatorNotSpecified,
    TargetOfRepeatOperatorInvalid,
    NestedRepeatOperator,
    UnmatchedCloseParenthesis,
    EndPatternWithUnmatchedParenthesis,
    EndPatternInGroup,
    UndefinedGroupOption,
    InvalidGroupOption,
    InvalidPosixBracketType,
    InvalidLookBehindPattern,
    InvalidRepeatRangePattern,
    TooBigNumber,
    TooBigNumberForRepeatRange,
    UpperSmallerThanLowerInRepeatRange,
    EmptyRangeInCharClass,
    MismatchCodeLengthInClassRange,
    TooManyMultiByteRanges,
    TooShortMultiByteString,
    TooBigBackrefNumber,
    InvalidBackref,
    NumberedBackrefOrCallNotAllowed,
    TooManyCaptures,
    TooLongWideCharValue,
    UndefinedOperator,
    EmptyGroupName,
    InvalidGroupName,
    InvalidCharInGroupName,
    UndefinedNameReference,
    UndefinedGroupReference,
    MultiplexDefinedName,
    MultiplexDefinitionNameCall,
    NeverEndingRecursion,
    GroupNumberOverForCaptureHistory,
    InvalidCharPropertyName,
    InvalidIfElseSyntax,
    InvalidAbsentGroupPattern,
    InvalidAbsentGroupGeneratorPattern,
    InvalidCalloutPattern,
    InvalidCalloutName,
    UndefinedCalloutName,
    InvalidCalloutBody,
    InvalidCalloutTagName,
    InvalidCalloutArg,
    InvalidCodePointValue,
    InvalidWideCharValue,
    TooBigWideCharValue,
    NotSupportedEncodingCombination,
    InvalidCombinationOfOptions,
    TooManyUserDefinedObjects,
    TooLongPropertyName,
    VeryInefficientPattern,
    LibraryIsNotInitialized,
    Unknown,
};

const error_code_map: []const struct { Error, c_int } = &.{
    .{ Error.Mismatch, c.ONIG_MISMATCH },
    .{ Error.NoSupportConfig, c.ONIG_NO_SUPPORT_CONFIG },
    .{ Error.Abort, c.ONIG_ABORT },
    .{ Error.Memory, c.ONIGERR_MEMORY },
    .{ Error.TypeBug, c.ONIGERR_TYPE_BUG },
    .{ Error.ParserBug, c.ONIGERR_PARSER_BUG },
    .{ Error.StackBug, c.ONIGERR_STACK_BUG },
    .{ Error.UndefinedBytecode, c.ONIGERR_UNDEFINED_BYTECODE },
    .{ Error.UnexpectedBytecode, c.ONIGERR_UNEXPECTED_BYTECODE },
    .{ Error.MatchStackLimitOver, c.ONIGERR_MATCH_STACK_LIMIT_OVER },
    .{ Error.ParseDepthLimitOver, c.ONIGERR_PARSE_DEPTH_LIMIT_OVER },
    .{ Error.RetryLimitInMatchOver, c.ONIGERR_RETRY_LIMIT_IN_MATCH_OVER },
    .{ Error.RetryLimitInSearchOver, c.ONIGERR_RETRY_LIMIT_IN_SEARCH_OVER },
    .{ Error.SubexpCallLimitInSearchOver, c.ONIGERR_SUBEXP_CALL_LIMIT_IN_SEARCH_OVER },
    .{ Error.DefaultEncodingIsNotSet, c.ONIGERR_DEFAULT_ENCODING_IS_NOT_SET },
    .{ Error.SpecifiedEncodingCantConvertToWideChar, c.ONIGERR_SPECIFIED_ENCODING_CANT_CONVERT_TO_WIDE_CHAR },
    .{ Error.FailToInitialize, c.ONIGERR_FAIL_TO_INITIALIZE },
    .{ Error.InvalidArgument, c.ONIGERR_INVALID_ARGUMENT },
    .{ Error.EndPatternAtLeftBrace, c.ONIGERR_END_PATTERN_AT_LEFT_BRACE },
    .{ Error.EndPatternAtLeftBracket, c.ONIGERR_END_PATTERN_AT_LEFT_BRACKET },
    .{ Error.EmptyCharClass, c.ONIGERR_EMPTY_CHAR_CLASS },
    .{ Error.PrematureEndOfCharClass, c.ONIGERR_PREMATURE_END_OF_CHAR_CLASS },
    .{ Error.EndPatternAtEscape, c.ONIGERR_END_PATTERN_AT_ESCAPE },
    .{ Error.EndPatternAtMeta, c.ONIGERR_END_PATTERN_AT_META },
    .{ Error.EndPatternAtControl, c.ONIGERR_END_PATTERN_AT_CONTROL },
    .{ Error.MetaCodeSyntax, c.ONIGERR_META_CODE_SYNTAX },
    .{ Error.ControlCodeSyntax, c.ONIGERR_CONTROL_CODE_SYNTAX },
    .{ Error.CharClassValueAtEndOfRange, c.ONIGERR_CHAR_CLASS_VALUE_AT_END_OF_RANGE },
    .{ Error.CharClassValueAtStartOfRange, c.ONIGERR_CHAR_CLASS_VALUE_AT_START_OF_RANGE },
    .{ Error.UnmatchedRangeSpecifierInCharClass, c.ONIGERR_UNMATCHED_RANGE_SPECIFIER_IN_CHAR_CLASS },
    .{ Error.TargetOfRepeatOperatorNotSpecified, c.ONIGERR_TARGET_OF_REPEAT_OPERATOR_NOT_SPECIFIED },
    .{ Error.TargetOfRepeatOperatorInvalid, c.ONIGERR_TARGET_OF_REPEAT_OPERATOR_INVALID },
    .{ Error.NestedRepeatOperator, c.ONIGERR_NESTED_REPEAT_OPERATOR },
    .{ Error.UnmatchedCloseParenthesis, c.ONIGERR_UNMATCHED_CLOSE_PARENTHESIS },
    .{ Error.EndPatternWithUnmatchedParenthesis, c.ONIGERR_END_PATTERN_WITH_UNMATCHED_PARENTHESIS },
    .{ Error.EndPatternInGroup, c.ONIGERR_END_PATTERN_IN_GROUP },
    .{ Error.UndefinedGroupOption, c.ONIGERR_UNDEFINED_GROUP_OPTION },
    .{ Error.InvalidGroupOption, c.ONIGERR_INVALID_GROUP_OPTION },
    .{ Error.InvalidPosixBracketType, c.ONIGERR_INVALID_POSIX_BRACKET_TYPE },
    .{ Error.InvalidLookBehindPattern, c.ONIGERR_INVALID_LOOK_BEHIND_PATTERN },
    .{ Error.InvalidRepeatRangePattern, c.ONIGERR_INVALID_REPEAT_RANGE_PATTERN },
    .{ Error.TooBigNumber, c.ONIGERR_TOO_BIG_NUMBER },
    .{ Error.TooBigNumberForRepeatRange, c.ONIGERR_TOO_BIG_NUMBER_FOR_REPEAT_RANGE },
    .{ Error.UpperSmallerThanLowerInRepeatRange, c.ONIGERR_UPPER_SMALLER_THAN_LOWER_IN_REPEAT_RANGE },
    .{ Error.EmptyRangeInCharClass, c.ONIGERR_EMPTY_RANGE_IN_CHAR_CLASS },
    .{ Error.MismatchCodeLengthInClassRange, c.ONIGERR_MISMATCH_CODE_LENGTH_IN_CLASS_RANGE },
    .{ Error.TooManyMultiByteRanges, c.ONIGERR_TOO_MANY_MULTI_BYTE_RANGES },
    .{ Error.TooShortMultiByteString, c.ONIGERR_TOO_SHORT_MULTI_BYTE_STRING },
    .{ Error.TooBigBackrefNumber, c.ONIGERR_TOO_BIG_BACKREF_NUMBER },
    .{ Error.InvalidBackref, c.ONIGERR_INVALID_BACKREF },
    .{ Error.NumberedBackrefOrCallNotAllowed, c.ONIGERR_NUMBERED_BACKREF_OR_CALL_NOT_ALLOWED },
    .{ Error.TooManyCaptures, c.ONIGERR_TOO_MANY_CAPTURES },
    .{ Error.TooLongWideCharValue, c.ONIGERR_TOO_LONG_WIDE_CHAR_VALUE },
    .{ Error.UndefinedOperator, c.ONIGERR_UNDEFINED_OPERATOR },
    .{ Error.EmptyGroupName, c.ONIGERR_EMPTY_GROUP_NAME },
    .{ Error.InvalidGroupName, c.ONIGERR_INVALID_GROUP_NAME },
    .{ Error.InvalidCharInGroupName, c.ONIGERR_INVALID_CHAR_IN_GROUP_NAME },
    .{ Error.UndefinedNameReference, c.ONIGERR_UNDEFINED_NAME_REFERENCE },
    .{ Error.UndefinedGroupReference, c.ONIGERR_UNDEFINED_GROUP_REFERENCE },
    .{ Error.MultiplexDefinedName, c.ONIGERR_MULTIPLEX_DEFINED_NAME },
    .{ Error.MultiplexDefinitionNameCall, c.ONIGERR_MULTIPLEX_DEFINITION_NAME_CALL },
    .{ Error.NeverEndingRecursion, c.ONIGERR_NEVER_ENDING_RECURSION },
    .{ Error.GroupNumberOverForCaptureHistory, c.ONIGERR_GROUP_NUMBER_OVER_FOR_CAPTURE_HISTORY },
    .{ Error.InvalidCharPropertyName, c.ONIGERR_INVALID_CHAR_PROPERTY_NAME },
    .{ Error.InvalidIfElseSyntax, c.ONIGERR_INVALID_IF_ELSE_SYNTAX },
    .{ Error.InvalidAbsentGroupPattern, c.ONIGERR_INVALID_ABSENT_GROUP_PATTERN },
    .{ Error.InvalidAbsentGroupGeneratorPattern, c.ONIGERR_INVALID_ABSENT_GROUP_GENERATOR_PATTERN },
    .{ Error.InvalidCalloutPattern, c.ONIGERR_INVALID_CALLOUT_PATTERN },
    .{ Error.InvalidCalloutName, c.ONIGERR_INVALID_CALLOUT_NAME },
    .{ Error.UndefinedCalloutName, c.ONIGERR_UNDEFINED_CALLOUT_NAME },
    .{ Error.InvalidCalloutBody, c.ONIGERR_INVALID_CALLOUT_BODY },
    .{ Error.InvalidCalloutTagName, c.ONIGERR_INVALID_CALLOUT_TAG_NAME },
    .{ Error.InvalidCalloutArg, c.ONIGERR_INVALID_CALLOUT_ARG },
    .{ Error.InvalidCodePointValue, c.ONIGERR_INVALID_CODE_POINT_VALUE },
    .{ Error.InvalidWideCharValue, c.ONIGERR_INVALID_WIDE_CHAR_VALUE },
    .{ Error.TooBigWideCharValue, c.ONIGERR_TOO_BIG_WIDE_CHAR_VALUE },
    .{ Error.NotSupportedEncodingCombination, c.ONIGERR_NOT_SUPPORTED_ENCODING_COMBINATION },
    .{ Error.InvalidCombinationOfOptions, c.ONIGERR_INVALID_COMBINATION_OF_OPTIONS },
    .{ Error.TooManyUserDefinedObjects, c.ONIGERR_TOO_MANY_USER_DEFINED_OBJECTS },
    .{ Error.TooLongPropertyName, c.ONIGERR_TOO_LONG_PROPERTY_NAME },
    .{ Error.VeryInefficientPattern, c.ONIGERR_VERY_INEFFICIENT_PATTERN },
    .{ Error.LibraryIsNotInitialized, c.ONIGERR_LIBRARY_IS_NOT_INITIALIZED },
};