// Original definitions in https://github.com/DefinitelyTyped/DefinitelyTyped by: David Muller <https://github.com/davidm77>

/// <reference types="node" />

import * as stream from "stream";

export type Callback = (err: CsvError | undefined, records: any | undefined, info: Info) => void;

export interface Parser extends stream.Transform {}

export class Parser {
    constructor(options: Options);
    
    __push(line: any): any;
    
    __write(chars: any, end: any, callback: any): any;
    
    readonly options: Options
    
    readonly info: Info;
}

export interface CastingContext {
    readonly column: number | string;
    readonly empty_lines: number;
    readonly error: CsvError;
    readonly header: boolean;
    readonly index: number;
    readonly quoting: boolean;
    readonly lines: number;
    readonly records: number;
    readonly invalid_field_length: number;
}

export type CastingFunction = (value: string, context: CastingContext) => any;

export type CastingDateFunction = (value: string, context: CastingContext) => Date;

export type ColumnOption = string | undefined | null | false | { name: string };

/*
Note, could not `extends stream.TransformOptions` because encoding can be
BufferEncoding and undefined as well as null which is not defined in the
extended type.
*/
export interface Options {
    /**
     * If true, the parser will attempt to convert read data types to native types.
     * @deprecated Use {@link cast}
     */
    auto_parse?: boolean | CastingFunction;
    autoParse?: boolean | CastingFunction;
    /**
     * If true, the parser will attempt to convert read data types to dates. It requires the "auto_parse" option.
     * @deprecated Use {@link cast_date}
     */
    auto_parse_date?: boolean | CastingDateFunction;
    autoParseDate?: boolean | CastingDateFunction;
    /**
     * If true, detect and exclude the byte order mark (BOM) from the CSV input if present.
     */
    bom?: boolean;
    /**
     * If true, the parser will attempt to convert input string to native types.
     * If a function, receive the value as first argument, a context as second argument and return a new value. More information about the context properties is available below.
     */
    cast?: boolean | CastingFunction;
    /**
     * If true, the parser will attempt to convert input string to dates.
     * If a function, receive the value as argument and return a new value. It requires the "auto_parse" option. Be careful, it relies on Date.parse.
     */
    cast_date?: boolean | CastingDateFunction;
    castDate?: boolean | CastingDateFunction;
    /**
     * List of fields as an array,
     * a user defined callback accepting the first line and returning the column names or true if autodiscovered in the first CSV line,
     * default to null,
     * affect the result data set in the sense that records will be objects instead of arrays.
     */
    columns?: ColumnOption[] | boolean | ((record: any) => ColumnOption[]);
    /**
     * Convert values into an array of values when columns are activated and
     * when multiple columns of the same name are found.
     */
    group_columns_by_name?: boolean;
    groupColumnsByName?: boolean;
    /**
     * Treat all the characters after this one as a comment, default to '' (disabled).
     */
    comment?: string;
    /**
     * Set the field delimiter. One character only, defaults to comma.
     */
    delimiter?: string | string[] | Buffer;
    /**
     * Set the source and destination encoding, a value of `null` returns buffer instead of strings.
     */
    encoding?: BufferEncoding | undefined;
    /**
     * Set the escape character, one character only, defaults to double quotes.
     */
    escape?: string | null | false | Buffer;
    /**
     * Start handling records from the requested number of records.
     */
    from?: number;
    /**
     * Start handling records from the requested line number.
     */
    from_line?: number;
    fromLine?: number;
    /**
     * Don't interpret delimiters as such in the last field according to the number of fields calculated from the number of columns, the option require the presence of the `column` option when `true`.
     */
    ignore_last_delimiters?: boolean | number;
    /**
     * Generate two properties `info` and `record` where `info` is a snapshot of the info object at the time the record was created and `record` is the parsed array or object.
     */
    info?: boolean;
    /**
     * If true, ignore whitespace immediately following the delimiter (i.e. left-trim all fields), defaults to false.
     * Does not remove whitespace in a quoted field.
     */
    ltrim?: boolean;
    /**
     * Maximum numer of characters to be contained in the field and line buffers before an exception is raised,
     * used to guard against a wrong delimiter or record_delimiter,
     * default to 128000 characters.
     */
    max_record_size?: number;
    maxRecordSize?: number;
    /**
     * Name of header-record title to name objects by.
     */
    objname?: string;
    /**
     * Alter and filter records by executing a user defined function.
     */
    on_record?: (record: any, context: CastingContext) => any;
    onRecord?: (record: any, context: CastingContext) => any;
    /**
     * Optional character surrounding a field, one character only, defaults to double quotes.
     */
    quote?: string | boolean | Buffer | null;
    /**
     * Generate two properties raw and row where raw is the original CSV row content and row is the parsed array or object.
     */
    raw?: boolean;
    /**
     * Discard inconsistent columns count, default to false.
     */
    relax_column_count?: boolean;
    relaxColumnCount?: boolean;
    /**
     * Discard inconsistent columns count when the record contains less fields than expected, default to false.
     */
    relax_column_count_less?: boolean;
    relaxColumnCountLess?: boolean;
    /**
     * Discard inconsistent columns count when the record contains more fields than expected, default to false.
     */
    relax_column_count_more?: boolean;
    relaxColumnCountMore?: boolean;
    /**
     * Preserve quotes inside unquoted field.
     */
    relax_quotes?: boolean;
    relaxQuotes?: boolean;
    /**
     * One or multiple characters used to delimit record rows; defaults to auto discovery if not provided.
     * Supported auto discovery method are Linux ("\n"), Apple ("\r") and Windows ("\r\n") row delimiters.
     */
    record_delimiter?: string | string[] | Buffer | Buffer[];
    recordDelimiter?: string | string[] | Buffer | Buffer[];
    /**
     * If true, ignore whitespace immediately preceding the delimiter (i.e. right-trim all fields), defaults to false.
     * Does not remove whitespace in a quoted field.
     */
    rtrim?: boolean;
    /**
     * Dont generate empty values for empty lines.
     * Defaults to false
     */
    skip_empty_lines?: boolean;
    skipEmptyLines?: boolean;
    /**
     * Skip a line with error found inside and directly go process the next line.
     */
    skip_records_with_error?: boolean;
    skipRecordsWithError?: boolean;
    /**
     * Don't generate records for lines containing empty column values (column matching /\s*\/), defaults to false.
     */
    skip_records_with_empty_values?: boolean;
    skipRecordsWithEmptyValues?: boolean;
    /**
     * Stop handling records after the requested number of records.
     */
    to?: number;
    /**
     * Stop handling records after the requested line number.
     */
    to_line?: number;
    toLine?: number;
    /**
     * If true, ignore whitespace immediately around the delimiter, defaults to false.
     * Does not remove whitespace in a quoted field.
     */
    trim?: boolean;
}

export interface Info {
    /**
     * Count the number of lines being fully commented.
     */
    readonly comment_lines: number;
    /**
     * Count the number of processed empty lines.
     */
    readonly empty_lines: number;
    /**
     * The number of lines encountered in the source dataset, start at 1 for the first line.
     */
    readonly lines: number;
    /**
     * Count the number of processed records.
     */
    readonly records: number;
    /**
     * Count of the number of processed bytes.
     */
    readonly bytes: number;
    /**
     * Number of non uniform records when `relax_column_count` is true.
     */
    readonly invalid_field_length: number;
}

export type CsvErrorCode = 
    'CSV_INVALID_OPTION_BOM'
    | 'CSV_INVALID_OPTION_CAST'
    | 'CSV_INVALID_OPTION_CAST_DATE'
    | 'CSV_INVALID_OPTION_COLUMNS'
    | 'CSV_INVALID_OPTION_GROUP_COLUMNS_BY_NAME'
    | 'CSV_INVALID_OPTION_COMMENT'
    | 'CSV_INVALID_OPTION_DELIMITER'
    | 'CSV_INVALID_OPTION_ON_RECORD'
    | 'CSV_INVALID_CLOSING_QUOTE'
    | 'INVALID_OPENING_QUOTE'
    | 'CSV_INVALID_COLUMN_MAPPING'
    | 'CSV_INVALID_ARGUMENT'
    | 'CSV_INVALID_COLUMN_DEFINITION'
    | 'CSV_MAX_RECORD_SIZE'
    | 'CSV_NON_TRIMABLE_CHAR_AFTER_CLOSING_QUOTE'
    | 'CSV_QUOTE_NOT_CLOSED'
    | 'CSV_RECORD_INCONSISTENT_FIELDS_LENGTH'
    | 'CSV_RECORD_INCONSISTENT_COLUMNS'
    | 'CSV_OPTION_COLUMNS_MISSING_NAME'

export class CsvError extends Error {
    readonly code: CsvErrorCode;
    [key: string]: any;

    constructor(code: CsvErrorCode, message: string | string[], options?: Options, ...contexts: any[]);
}

declare function parse(input: Buffer | string, options?: Options, callback?: Callback): Parser;
declare function parse(input: Buffer | string, callback?: Callback): Parser;
declare function parse(options?: Options, callback?: Callback): Parser;
declare function parse(callback?: Callback): Parser;

// export default parse;
export { parse }
