import { ISpreadsheetService } from "../interfaces/ISpreadsheetService";

export class GASSpreadsheetService implements ISpreadsheetService {
  private getSheet(sheetName: string): GoogleAppsScript.Spreadsheet.Sheet {
    const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName);
    if (!sheet) {
      throw new Error(`Sheet '${sheetName}' not found`);
    }
    return sheet;
  }

  private getColumnIndex(sheet: GoogleAppsScript.Spreadsheet.Sheet, columnName: string): number {
    const headers = sheet.getRange(1, 1, 1, sheet.getLastColumn()).getValues()[0];
    return headers.indexOf(columnName);
  }

  getHeaders(sheetName: string): string[] {
    const sheet = this.getSheet(sheetName);
    return sheet.getRange(1, 1, 1, sheet.getLastColumn()).getValues()[0];
  }

  getRowData(sheetName: string, row: number): any[] {
    const sheet = this.getSheet(sheetName);
    const lastCol = sheet.getLastColumn();
    // getRange(row, column, numRows, numColumns)
    return sheet.getRange(row, 1, 1, lastCol).getValues()[0];
  }

  getRowNumberByColumnValue(sheetName: string, columnName: string, value: any): number | undefined {
    const sheet = this.getSheet(sheetName);
    const colIndex = this.getColumnIndex(sheet, columnName);
    if (colIndex === -1) return undefined;

    // Get all values in the column. Note: calling getValues() on a large sheet might be slow,
    // but this matches the previous implementation's performance characteristics more or less.
    // Ideally we would cache this or use a more efficient find.
    // offset(1, colIndex) to skip header, but actually getColumnValuesByName usually gets everything including header or handles it.
    // Original implementation: getColumnValuesByName gets range from row 2.

    const data = sheet.getRange(2, colIndex + 1, sheet.getLastRow() - 1, 1).getValues();
    const flatData = data.map(r => r[0]);
    const index = flatData.indexOf(value);

    if (index === -1) return undefined;
    return index + 2; // +1 for 0-based index, +1 for header row
  }

  setCellValueByColumnName(sheetName: string, row: number, columnName: string, value: any): void {
    const sheet = this.getSheet(sheetName);
    const colIndex = this.getColumnIndex(sheet, columnName);
    if (colIndex !== -1) {
      sheet.getRange(row, colIndex + 1).setValue(value);
    }
  }

  getCellValueByColumnName(sheetName: string, row: number, columnName: string): any {
    const sheet = this.getSheet(sheetName);
    const colIndex = this.getColumnIndex(sheet, columnName);
    if (colIndex !== -1) {
      return sheet.getRange(row, colIndex + 1).getValue();
    }
    return null;
  }

  getCellHyperlink(sheetName: string, row: number, columnName: string): string | null {
    const sheet = this.getSheet(sheetName);
    const colIndex = this.getColumnIndex(sheet, columnName);
    if (colIndex !== -1) {
      return sheet.getRange(row, colIndex + 1).getRichTextValue().getLinkUrl();
    }
    return null;
  }

  setCellHyperlink(sheetName: string, row: number, columnName: string, displayText: string, url: string): void {
    const sheet = this.getSheet(sheetName);
    const colIndex = this.getColumnIndex(sheet, columnName);
    if (colIndex !== -1) {
      const richText = SpreadsheetApp.newRichTextValue()
        .setText(displayText)
        .setLinkUrl(url)
        .build();
      sheet.getRange(row, colIndex + 1).setRichTextValue(richText);
    }
  }
}