import { google } from 'googleapis';
import { NextResponse } from 'next/server';

export async function GET() {
  const target = ['https://www.googleapis.com/auth/spreadsheets.readonly'];
  const jwt = new google.auth.JWT(
    process.env.API_EMAIL,
    undefined,
    (process.env.API_KEY || '').replace(/\\n/g, '\n'),
    target
  );

  const sheets = google.sheets({ version: 'v4', auth: jwt });
  const response = await sheets.spreadsheets.get({
    spreadsheetId: process.env.SPREADSHEET_ID,
    ranges: [
      'Overview!B22:R22',
      'Overview!B23:S23',
      'Overview!B24:R24',
      'Overview!B25:S25',
      'Overview!B26:S26',
      'Overview!B27:Q27',
      'Overview!B28:Q28',
      'Overview!B29:Q29',
      'Overview!B30:P30',
      'Overview!B31:P31',
      'Overview!B32:P32',
      'Overview!B33:P33',
      'Overview!B34:O34',
    ],
    includeGridData: true,
  });

  const sheetsData = response.data.sheets;
  if (sheetsData?.length) {

    const rows = sheetsData[0].data;
    const merges = sheetsData[0].merges;
    if (rows?.length) {
      let rowLenghts = new Array<any>;
      if (rows[0].rowData?.length) {
        rowLenghts = rows[0].rowData;
      }
      let speciesArray = new Array<number>;

      for (let i = 0; i < rows.length; i++) {
        let sRows = rows[i].rowData;
        if (sRows?.length) {
          let data = sRows[0].values;
          if (data?.length) {
            speciesArray[i] = 0;
            for (let j = 0; j < data.length; j++) {
              switch (data[j].userEnteredValue?.stringValue) {
                case ("Taken"): {
                  speciesArray[i] = speciesArray[i] + 2;
                  break;
                }
                case ("A"):
                case ("B"):
                case ("-"): {
                  speciesArray[i] = speciesArray[i] + 1;
                  break;
                }
              }
            }

            if (merges?.length) {
              merges.slice(1, merges.length).forEach(merge => {
                if (merge.startRowIndex && merge.startRowIndex - 21 == i) {
                  speciesArray[i] = speciesArray[i] + 2;
                }
              });
            }
          }
          else {
            speciesArray[i] = 0;
          }
        }
      }

      console.log("New Google Data loaded " + Intl.DateTimeFormat('en-UK', {hour: 'numeric', minute: 'numeric', hour12: false}).format(Date.now()));
      return NextResponse.json({ speciesArray });
    }
  }
  else {
    return NextResponse.json({ status: 500 })
  }
}