import { normalize_columns_array } from "./normalize_columns_array.js";
import { init_state } from "./init_state.js";
import { normalize_options } from "./normalize_options.js";
import { CsvError } from "./CsvError.js";

const isRecordEmpty = function (record) {
  return record.every(
    (field) =>
      field == null || (field.toString && field.toString().trim() === ""),
  );
};

const cr = 13; // `\r`, carriage return, 0x0D in hexadécimal, 13 in decimal
const nl = 10; // `\n`, newline, 0x0A in hexadecimal, 10 in decimal

const boms = {
  // Note, the following are equals:
  // Buffer.from("\ufeff")
  // Buffer.from([239, 187, 191])
  // Buffer.from('EFBBBF', 'hex')
  utf8: Buffer.from([239, 187, 191]),
  // Note, the following are equals:
  // Buffer.from "\ufeff", 'utf16le
  // Buffer.from([255, 254])
  utf16le: Buffer.from([255, 254]),
};

const transform = function (original_options = {}) {
  const info = {
    bytes: 0,
    bytes_records: 0,
    comment_lines: 0,
    empty_lines: 0,
    invalid_field_length: 0,
    lines: 1,
    records: 0,
  };
  const options = normalize_options(original_options);
  return {
    info: info,
    original_options: original_options,
    options: options,
    state: init_state(options),
    __needMoreData: function (i, bufLen, end) {
      if (end) return false;
      const { encoding, escape, quote } = this.options;
      const { quoting, needMoreDataSize, recordDelimiterMaxLength } =
        this.state;
      const numOfCharLeft = bufLen - i - 1;
      const requiredLength = Math.max(
        needMoreDataSize,
        // Skip if the remaining buffer smaller than record delimiter
        // If "record_delimiter" is yet to be discovered:
        // 1. It is equals to `[]` and "recordDelimiterMaxLength" equals `0`
        // 2. We set the length to windows line ending in the current encoding
        // Note, that encoding is known from user or bom discovery at that point
        // recordDelimiterMaxLength,
        recordDelimiterMaxLength === 0
          ? Buffer.from("\r\n", encoding).length
          : recordDelimiterMaxLength,
        // Skip if remaining buffer can be an escaped quote
        quoting ? (escape === null ? 0 : escape.length) + quote.length : 0,
        // Skip if remaining buffer can be record delimiter following the closing quote
        quoting ? quote.length + recordDelimiterMaxLength : 0,
      );
      return numOfCharLeft < requiredLength;
    },
    // Central parser implementation
    parse: function (nextBuf, end, push, close) {
      const {
        bom,
        comment_no_infix,
        encoding,
        from_line,
        ltrim,
        max_record_size,
        raw,
        relax_quotes,
        rtrim,
        skip_empty_lines,
        to,
        to_line,
      } = this.options;
      let { comment, escape, quote, record_delimiter } = this.options;
      const { bomSkipped, previousBuf, rawBuffer, escapeIsQuote } = this.state;
      let buf;
      if (previousBuf === undefined) {
        if (nextBuf === undefined) {
          // Handle empty string
          close();
          return;
        } else {
          buf = nextBuf;
        }
      } else if (previousBuf !== undefined && nextBuf === undefined) {
        buf = previousBuf;
      } else {
        buf = Buffer.concat([previousBuf, nextBuf]);
      }
      // Handle UTF BOM
      if (bomSkipped === false) {
        if (bom === false) {
          this.state.bomSkipped = true;
        } else if (buf.length < 3) {
          // No enough data
          if (end === false) {
            // Wait for more data
            this.state.previousBuf = buf;
            return;
          }
        } else {
          for (const encoding in boms) {
            if (boms[encoding].compare(buf, 0, boms[encoding].length) === 0) {
              // Skip BOM
              const bomLength = boms[encoding].length;
              this.state.bufBytesStart += bomLength;
              buf = buf.slice(bomLength);
              // Renormalize original options with the new encoding
              const options = normalize_options({
                ...this.original_options,
                encoding: encoding,
              });
              // Properties are merged with the existing options instance
              for (const key in options) {
                this.options[key] = options[key];
              }
              // Options will re-evaluate the Buffer with the new encoding
              ({ comment, escape, quote } = this.options);
              break;
            }
          }
          this.state.bomSkipped = true;
        }
      }
      const bufLen = buf.length;
      let pos;
      for (pos = 0; pos < bufLen; pos++) {
        // Ensure we get enough space to look ahead
        // There should be a way to move this out of the loop
        if (this.__needMoreData(pos, bufLen, end)) {
          break;
        }
        if (this.state.wasRowDelimiter === true) {
          this.info.lines++;
          this.state.wasRowDelimiter = false;
        }
        if (to_line !== -1 && this.info.lines > to_line) {
          this.state.stop = true;
          close();
          return;
        }
        // Auto discovery of record_delimiter, unix, mac and windows supported
        if (this.state.quoting === false && record_delimiter.length === 0) {
          const record_delimiterCount = this.__autoDiscoverRecordDelimiter(
            buf,
            pos,
          );
          if (record_delimiterCount) {
            record_delimiter = this.options.record_delimiter;
          }
        }
        const chr = buf[pos];
        if (raw === true) {
          rawBuffer.append(chr);
        }
        if (
          (chr === cr || chr === nl) &&
          this.state.wasRowDelimiter === false
        ) {
          this.state.wasRowDelimiter = true;
        }
        // Previous char was a valid escape char
        // treat the current char as a regular char
        if (this.state.escaping === true) {
          this.state.escaping = false;
        } else {
          // Escape is only active inside quoted fields
          // We are quoting, the char is an escape chr and there is a chr to escape
          // if(escape !== null && this.state.quoting === true && chr === escape && pos + 1 < bufLen){
          if (
            escape !== null &&
            this.state.quoting === true &&
            this.__isEscape(buf, pos, chr) &&
            pos + escape.length < bufLen
          ) {
            if (escapeIsQuote) {
              if (this.__isQuote(buf, pos + escape.length)) {
                this.state.escaping = true;
                pos += escape.length - 1;
                continue;
              }
            } else {
              this.state.escaping = true;
              pos += escape.length - 1;
              continue;
            }
          }
          // Not currently escaping and chr is a quote
          // TODO: need to compare bytes instead of single char
          if (this.state.commenting === false && this.__isQuote(buf, pos)) {
            if (this.state.quoting === true) {
              const nextChr = buf[pos + quote.length];
              const isNextChrTrimable =
                rtrim && this.__isCharTrimable(buf, pos + quote.length);
              const isNextChrComment =
                comment !== null &&
                this.__compareBytes(comment, buf, pos + quote.length, nextChr);
              const isNextChrDelimiter = this.__isDelimiter(
                buf,
                pos + quote.length,
                nextChr,
              );
              const isNextChrRecordDelimiter =
                record_delimiter.length === 0
                  ? this.__autoDiscoverRecordDelimiter(buf, pos + quote.length)
                  : this.__isRecordDelimiter(nextChr, buf, pos + quote.length);
              // Escape a quote
              // Treat next char as a regular character
              if (
                escape !== null &&
                this.__isEscape(buf, pos, chr) &&
                this.__isQuote(buf, pos + escape.length)
              ) {
                pos += escape.length - 1;
              } else if (
                !nextChr ||
                isNextChrDelimiter ||
                isNextChrRecordDelimiter ||
                isNextChrComment ||
                isNextChrTrimable
              ) {
                this.state.quoting = false;
                this.state.wasQuoting = true;
                pos += quote.length - 1;
                continue;
              } else if (relax_quotes === false) {
                const err = this.__error(
                  new CsvError(
                    "CSV_INVALID_CLOSING_QUOTE",
                    [
                      "Invalid Closing Quote:",
                      `got "${String.fromCharCode(nextChr)}"`,
                      `at line ${this.info.lines}`,
                      "instead of delimiter, record delimiter, trimable character",
                      "(if activated) or comment",
                    ],
                    this.options,
                    this.__infoField(),
                  ),
                );
                if (err !== undefined) return err;
              } else {
                this.state.quoting = false;
                this.state.wasQuoting = true;
                this.state.field.prepend(quote);
                pos += quote.length - 1;
              }
            } else {
              if (this.state.field.length !== 0) {
                // In relax_quotes mode, treat opening quote preceded by chrs as regular
                if (relax_quotes === false) {
                  const info = this.__infoField();
                  const bom = Object.keys(boms)
                    .map((b) =>
                      boms[b].equals(this.state.field.toString()) ? b : false,
                    )
                    .filter(Boolean)[0];
                  const err = this.__error(
                    new CsvError(
                      "INVALID_OPENING_QUOTE",
                      [
                        "Invalid Opening Quote:",
                        `a quote is found on field ${JSON.stringify(info.column)} at line ${info.lines}, value is ${JSON.stringify(this.state.field.toString(encoding))}`,
                        bom ? `(${bom} bom)` : undefined,
                      ],
                      this.options,
                      info,
                      {
                        field: this.state.field,
                      },
                    ),
                  );
                  if (err !== undefined) return err;
                }
              } else {
                this.state.quoting = true;
                pos += quote.length - 1;
                continue;
              }
            }
          }
          if (this.state.quoting === false) {
            const recordDelimiterLength = this.__isRecordDelimiter(
              chr,
              buf,
              pos,
            );
            if (recordDelimiterLength !== 0) {
              // Do not emit comments which take a full line
              const skipCommentLine =
                this.state.commenting &&
                this.state.wasQuoting === false &&
                this.state.record.length === 0 &&
                this.state.field.length === 0;
              if (skipCommentLine) {
                this.info.comment_lines++;
                // Skip full comment line
              } else {
                // Activate records emission if above from_line
                if (
                  this.state.enabled === false &&
                  this.info.lines +
                    (this.state.wasRowDelimiter === true ? 1 : 0) >=
                    from_line
                ) {
                  this.state.enabled = true;
                  this.__resetField();
                  this.__resetRecord();
                  pos += recordDelimiterLength - 1;
                  continue;
                }
                // Skip if line is empty and skip_empty_lines activated
                if (
                  skip_empty_lines === true &&
                  this.state.wasQuoting === false &&
                  this.state.record.length === 0 &&
                  this.state.field.length === 0
                ) {
                  this.info.empty_lines++;
                  pos += recordDelimiterLength - 1;
                  continue;
                }
                this.info.bytes = this.state.bufBytesStart + pos;
                const errField = this.__onField();
                if (errField !== undefined) return errField;
                this.info.bytes =
                  this.state.bufBytesStart + pos + recordDelimiterLength;
                const errRecord = this.__onRecord(push);
                if (errRecord !== undefined) return errRecord;
                if (to !== -1 && this.info.records >= to) {
                  this.state.stop = true;
                  close();
                  return;
                }
              }
              this.state.commenting = false;
              pos += recordDelimiterLength - 1;
              continue;
            }
            if (this.state.commenting) {
              continue;
            }
            if (
              comment !== null &&
              (comment_no_infix === false ||
                (this.state.record.length === 0 &&
                  this.state.field.length === 0))
            ) {
              const commentCount = this.__compareBytes(comment, buf, pos, chr);
              if (commentCount !== 0) {
                this.state.commenting = true;
                continue;
              }
            }
            const delimiterLength = this.__isDelimiter(buf, pos, chr);
            if (delimiterLength !== 0) {
              this.info.bytes = this.state.bufBytesStart + pos;
              const errField = this.__onField();
              if (errField !== undefined) return errField;
              pos += delimiterLength - 1;
              continue;
            }
          }
        }
        if (this.state.commenting === false) {
          if (
            max_record_size !== 0 &&
            this.state.record_length + this.state.field.length > max_record_size
          ) {
            return this.__error(
              new CsvError(
                "CSV_MAX_RECORD_SIZE",
                [
                  "Max Record Size:",
                  "record exceed the maximum number of tolerated bytes",
                  `of ${max_record_size}`,
                  `at line ${this.info.lines}`,
                ],
                this.options,
                this.__infoField(),
              ),
            );
          }
        }
        const lappend =
          ltrim === false ||
          this.state.quoting === true ||
          this.state.field.length !== 0 ||
          !this.__isCharTrimable(buf, pos);
        // rtrim in non quoting is handle in __onField
        const rappend = rtrim === false || this.state.wasQuoting === false;
        if (lappend === true && rappend === true) {
          this.state.field.append(chr);
        } else if (rtrim === true && !this.__isCharTrimable(buf, pos)) {
          return this.__error(
            new CsvError(
              "CSV_NON_TRIMABLE_CHAR_AFTER_CLOSING_QUOTE",
              [
                "Invalid Closing Quote:",
                "found non trimable byte after quote",
                `at line ${this.info.lines}`,
              ],
              this.options,
              this.__infoField(),
            ),
          );
        } else {
          if (lappend === false) {
            pos += this.__isCharTrimable(buf, pos) - 1;
          }
          continue;
        }
      }
      if (end === true) {
        // Ensure we are not ending in a quoting state
        if (this.state.quoting === true) {
          const err = this.__error(
            new CsvError(
              "CSV_QUOTE_NOT_CLOSED",
              [
                "Quote Not Closed:",
                `the parsing is finished with an opening quote at line ${this.info.lines}`,
              ],
              this.options,
              this.__infoField(),
            ),
          );
          if (err !== undefined) return err;
        } else {
          // Skip last line if it has no characters
          if (
            this.state.wasQuoting === true ||
            this.state.record.length !== 0 ||
            this.state.field.length !== 0
          ) {
            this.info.bytes = this.state.bufBytesStart + pos;
            const errField = this.__onField();
            if (errField !== undefined) return errField;
            const errRecord = this.__onRecord(push);
            if (errRecord !== undefined) return errRecord;
          } else if (this.state.wasRowDelimiter === true) {
            this.info.empty_lines++;
          } else if (this.state.commenting === true) {
            this.info.comment_lines++;
          }
        }
      } else {
        this.state.bufBytesStart += pos;
        this.state.previousBuf = buf.slice(pos);
      }
      if (this.state.wasRowDelimiter === true) {
        this.info.lines++;
        this.state.wasRowDelimiter = false;
      }
    },
    __onRecord: function (push) {
      const {
        columns,
        group_columns_by_name,
        encoding,
        info,
        from,
        relax_column_count,
        relax_column_count_less,
        relax_column_count_more,
        raw,
        skip_records_with_empty_values,
      } = this.options;
      const { enabled, record } = this.state;
      if (enabled === false) {
        return this.__resetRecord();
      }
      // Convert the first line into column names
      const recordLength = record.length;
      if (columns === true) {
        if (skip_records_with_empty_values === true && isRecordEmpty(record)) {
          this.__resetRecord();
          return;
        }
        return this.__firstLineToColumns(record);
      }
      if (columns === false && this.info.records === 0) {
        this.state.expectedRecordLength = recordLength;
      }
      if (recordLength !== this.state.expectedRecordLength) {
        const err =
          columns === false
            ? new CsvError(
                "CSV_RECORD_INCONSISTENT_FIELDS_LENGTH",
                [
                  "Invalid Record Length:",
                  `expect ${this.state.expectedRecordLength},`,
                  `got ${recordLength} on line ${this.info.lines}`,
                ],
                this.options,
                this.__infoField(),
                {
                  record: record,
                },
              )
            : new CsvError(
                "CSV_RECORD_INCONSISTENT_COLUMNS",
                [
                  "Invalid Record Length:",
                  `columns length is ${columns.length},`, // rename columns
                  `got ${recordLength} on line ${this.info.lines}`,
                ],
                this.options,
                this.__infoField(),
                {
                  record: record,
                },
              );
        if (
          relax_column_count === true ||
          (relax_column_count_less === true &&
            recordLength < this.state.expectedRecordLength) ||
          (relax_column_count_more === true &&
            recordLength > this.state.expectedRecordLength)
        ) {
          this.info.invalid_field_length++;
          this.state.error = err;
          // Error is undefined with skip_records_with_error
        } else {
          const finalErr = this.__error(err);
          if (finalErr) return finalErr;
        }
      }
      if (skip_records_with_empty_values === true && isRecordEmpty(record)) {
        this.__resetRecord();
        return;
      }
      if (this.state.recordHasError === true) {
        this.__resetRecord();
        this.state.recordHasError = false;
        return;
      }
      this.info.records++;
      if (from === 1 || this.info.records >= from) {
        const { objname } = this.options;
        // With columns, records are object
        if (columns !== false) {
          const obj = {};
          // Transform record array to an object
          for (let i = 0, l = record.length; i < l; i++) {
            if (columns[i] === undefined || columns[i].disabled) continue;
            // Turn duplicate columns into an array
            if (
              group_columns_by_name === true &&
              obj[columns[i].name] !== undefined
            ) {
              if (Array.isArray(obj[columns[i].name])) {
                obj[columns[i].name] = obj[columns[i].name].concat(record[i]);
              } else {
                obj[columns[i].name] = [obj[columns[i].name], record[i]];
              }
            } else {
              obj[columns[i].name] = record[i];
            }
          }
          // Without objname (default)
          if (raw === true || info === true) {
            const extRecord = Object.assign(
              { record: obj },
              raw === true
                ? { raw: this.state.rawBuffer.toString(encoding) }
                : {},
              info === true ? { info: this.__infoRecord() } : {},
            );
            const err = this.__push(
              objname === undefined ? extRecord : [obj[objname], extRecord],
              push,
            );
            if (err) {
              return err;
            }
          } else {
            const err = this.__push(
              objname === undefined ? obj : [obj[objname], obj],
              push,
            );
            if (err) {
              return err;
            }
          }
          // Without columns, records are array
        } else {
          if (raw === true || info === true) {
            const extRecord = Object.assign(
              { record: record },
              raw === true
                ? { raw: this.state.rawBuffer.toString(encoding) }
                : {},
              info === true ? { info: this.__infoRecord() } : {},
            );
            const err = this.__push(
              objname === undefined ? extRecord : [record[objname], extRecord],
              push,
            );
            if (err) {
              return err;
            }
          } else {
            const err = this.__push(
              objname === undefined ? record : [record[objname], record],
              push,
            );
            if (err) {
              return err;
            }
          }
        }
      }
      this.__resetRecord();
    },
    __firstLineToColumns: function (record) {
      const { firstLineToHeaders } = this.state;
      try {
        const headers =
          firstLineToHeaders === undefined
            ? record
            : firstLineToHeaders.call(null, record);
        if (!Array.isArray(headers)) {
          return this.__error(
            new CsvError(
              "CSV_INVALID_COLUMN_MAPPING",
              [
                "Invalid Column Mapping:",
                "expect an array from column function,",
                `got ${JSON.stringify(headers)}`,
              ],
              this.options,
              this.__infoField(),
              {
                headers: headers,
              },
            ),
          );
        }
        const normalizedHeaders = normalize_columns_array(headers);
        this.state.expectedRecordLength = normalizedHeaders.length;
        this.options.columns = normalizedHeaders;
        this.__resetRecord();
        return;
      } catch (err) {
        return err;
      }
    },
    __resetRecord: function () {
      if (this.options.raw === true) {
        this.state.rawBuffer.reset();
      }
      this.state.error = undefined;
      this.state.record = [];
      this.state.record_length = 0;
    },
    __onField: function () {
      const { cast, encoding, rtrim, max_record_size } = this.options;
      const { enabled, wasQuoting } = this.state;
      // Short circuit for the from_line options
      if (enabled === false) {
        return this.__resetField();
      }
      let field = this.state.field.toString(encoding);
      if (rtrim === true && wasQuoting === false) {
        field = field.trimRight();
      }
      if (cast === true) {
        const [err, f] = this.__cast(field);
        if (err !== undefined) return err;
        field = f;
      }
      this.state.record.push(field);
      // Increment record length if record size must not exceed a limit
      if (max_record_size !== 0 && typeof field === "string") {
        this.state.record_length += field.length;
      }
      this.__resetField();
    },
    __resetField: function () {
      this.state.field.reset();
      this.state.wasQuoting = false;
    },
    __push: function (record, push) {
      const { on_record } = this.options;
      if (on_record !== undefined) {
        const info = this.__infoRecord();
        try {
          record = on_record.call(null, record, info);
        } catch (err) {
          return err;
        }
        if (record === undefined || record === null) {
          return;
        }
      }
      this.info.bytes_records += this.info.bytes;
      push(record);
    },
    // Return a tuple with the error and the casted value
    __cast: function (field) {
      const { columns, relax_column_count } = this.options;
      const isColumns = Array.isArray(columns);
      // Dont loose time calling cast
      // because the final record is an object
      // and this field can't be associated to a key present in columns
      if (
        isColumns === true &&
        relax_column_count &&
        this.options.columns.length <= this.state.record.length
      ) {
        return [undefined, undefined];
      }
      if (this.state.castField !== null) {
        try {
          const info = this.__infoField();
          return [undefined, this.state.castField.call(null, field, info)];
        } catch (err) {
          return [err];
        }
      }
      if (this.__isFloat(field)) {
        return [undefined, parseFloat(field)];
      } else if (this.options.cast_date !== false) {
        const info = this.__infoField();
        return [undefined, this.options.cast_date.call(null, field, info)];
      }
      return [undefined, field];
    },
    // Helper to test if a character is a space or a line delimiter
    __isCharTrimable: function (buf, pos) {
      const isTrim = (buf, pos) => {
        const { timchars } = this.state;
        loop1: for (let i = 0; i < timchars.length; i++) {
          const timchar = timchars[i];
          for (let j = 0; j < timchar.length; j++) {
            if (timchar[j] !== buf[pos + j]) continue loop1;
          }
          return timchar.length;
        }
        return 0;
      };
      return isTrim(buf, pos);
    },
    // Keep it in case we implement the `cast_int` option
    // __isInt(value){
    //   // return Number.isInteger(parseInt(value))
    //   // return !isNaN( parseInt( obj ) );
    //   return /^(\-|\+)?[1-9][0-9]*$/.test(value)
    // }
    __isFloat: function (value) {
      return value - parseFloat(value) + 1 >= 0; // Borrowed from jquery
    },
    __compareBytes: function (sourceBuf, targetBuf, targetPos, firstByte) {
      if (sourceBuf[0] !== firstByte) return 0;
      const sourceLength = sourceBuf.length;
      for (let i = 1; i < sourceLength; i++) {
        if (sourceBuf[i] !== targetBuf[targetPos + i]) return 0;
      }
      return sourceLength;
    },
    __isDelimiter: function (buf, pos, chr) {
      const { delimiter, ignore_last_delimiters } = this.options;
      if (
        ignore_last_delimiters === true &&
        this.state.record.length === this.options.columns.length - 1
      ) {
        return 0;
      } else if (
        ignore_last_delimiters !== false &&
        typeof ignore_last_delimiters === "number" &&
        this.state.record.length === ignore_last_delimiters - 1
      ) {
        return 0;
      }
      loop1: for (let i = 0; i < delimiter.length; i++) {
        const del = delimiter[i];
        if (del[0] === chr) {
          for (let j = 1; j < del.length; j++) {
            if (del[j] !== buf[pos + j]) continue loop1;
          }
          return del.length;
        }
      }
      return 0;
    },
    __isRecordDelimiter: function (chr, buf, pos) {
      const { record_delimiter } = this.options;
      const recordDelimiterLength = record_delimiter.length;
      loop1: for (let i = 0; i < recordDelimiterLength; i++) {
        const rd = record_delimiter[i];
        const rdLength = rd.length;
        if (rd[0] !== chr) {
          continue;
        }
        for (let j = 1; j < rdLength; j++) {
          if (rd[j] !== buf[pos + j]) {
            continue loop1;
          }
        }
        return rd.length;
      }
      return 0;
    },
    __isEscape: function (buf, pos, chr) {
      const { escape } = this.options;
      if (escape === null) return false;
      const l = escape.length;
      if (escape[0] === chr) {
        for (let i = 0; i < l; i++) {
          if (escape[i] !== buf[pos + i]) {
            return false;
          }
        }
        return true;
      }
      return false;
    },
    __isQuote: function (buf, pos) {
      const { quote } = this.options;
      if (quote === null) return false;
      const l = quote.length;
      for (let i = 0; i < l; i++) {
        if (quote[i] !== buf[pos + i]) {
          return false;
        }
      }
      return true;
    },
    __autoDiscoverRecordDelimiter: function (buf, pos) {
      const { encoding } = this.options;
      // Note, we don't need to cache this information in state,
      // It is only called on the first line until we find out a suitable
      // record delimiter.
      const rds = [
        // Important, the windows line ending must be before mac os 9
        Buffer.from("\r\n", encoding),
        Buffer.from("\n", encoding),
        Buffer.from("\r", encoding),
      ];
      loop: for (let i = 0; i < rds.length; i++) {
        const l = rds[i].length;
        for (let j = 0; j < l; j++) {
          if (rds[i][j] !== buf[pos + j]) {
            continue loop;
          }
        }
        this.options.record_delimiter.push(rds[i]);
        this.state.recordDelimiterMaxLength = rds[i].length;
        return rds[i].length;
      }
      return 0;
    },
    __error: function (msg) {
      const { encoding, raw, skip_records_with_error } = this.options;
      const err = typeof msg === "string" ? new Error(msg) : msg;
      if (skip_records_with_error) {
        this.state.recordHasError = true;
        if (this.options.on_skip !== undefined) {
          try {
            this.options.on_skip(
              err,
              raw ? this.state.rawBuffer.toString(encoding) : undefined,
            );
          } catch (err) {
            return err;
          }
        }
        // this.emit('skip', err, raw ? this.state.rawBuffer.toString(encoding) : undefined);
        return undefined;
      } else {
        return err;
      }
    },
    __infoDataSet: function () {
      return {
        ...this.info,
        columns: this.options.columns,
      };
    },
    __infoRecord: function () {
      const { columns, raw, encoding } = this.options;
      return {
        ...this.__infoDataSet(),
        bytes_records: this.info.bytes,
        error: this.state.error,
        header: columns === true,
        index: this.state.record.length,
        raw: raw ? this.state.rawBuffer.toString(encoding) : undefined,
      };
    },
    __infoField: function () {
      const { columns } = this.options;
      const isColumns = Array.isArray(columns);
      // Bytes records are only incremented when all records'fields are parsed
      const bytes_records = this.info.bytes_records;
      return {
        ...this.__infoRecord(),
        bytes_records: bytes_records,
        column:
          isColumns === true
            ? columns.length > this.state.record.length
              ? columns[this.state.record.length].name
              : null
            : this.state.record.length,
        quoting: this.state.wasQuoting,
      };
    },
  };
};

export { transform, CsvError };
