import { Controller } from 'stimulus';

export default class DataUpdateScriptController extends Controller {

  forceRun(event) {
    event.preventDefault();
    const id         = event.target.dataset.value;
    let statusColumn = document.getElementById(`data_update_script_${id}_status`);
    let runAtColumn  = document.getElementById(`data_update_script_${id}_run_at`);

    this.displayLoadingIndicators(statusColumn, runAtColumn);
    this.forceRunScript(id, statusColumn, runAtColumn);
  }

  displayLoadingIndicators(statusColumn, runAtColumn) {
    runAtColumn.innerHTML  = 'loading..';
    statusColumn.innerHTML = '';
  }

  forceRunScript(id, statusColumn, runAtColumn) {
    fetch(`/admin/data_update_scripts/${id}/force_run`, {
      method: 'POST',
      headers: {
       'X-CSRF-Token': document.querySelector("meta[name='csrf-token']").content,
      },
      credentials: 'same-origin'
    })
    .then(response => {
      if(response.ok) {
        this.pollForScriptResponse(id, statusColumn, runAtColumn);
      } else {
        this.setErrorBanner(
          runAtColumn,
          statusColumn,
          `Data Script ${id} - Something went wrong`,
          'alert-danger'
        );
      }
    })
  }

  pollForScriptResponse(id, statusColumn, runAtColumn) {
    let counter = 0;
    let pollForStatus = setInterval(() => {
      counter++;
      this.checkForUpdatedDataScript(id, runAtColumn, statusColumn).then((updatedDataScript) => {
        if (updatedDataScript) {
          if(updatedDataScript.status) {
            // when we've stopped polling because we've received a status
            // and not because we've received an error.
            runAtColumn.innerHTML = updatedDataScript.run_at;
            statusColumn.innerHTML = `${updatedDataScript.status}`;
            if(updatedDataScript.error) {
              // we need to show the html as text instead of a parsed version,
              // hence we manipulate the DOM through this longer process.
              let errorElem = document.createElement('div');
              errorElem.setAttribute('class', 'fs-xs');
              errorElem.setAttribute('id', `data_update_script_${id}_error`);
              statusColumn.appendChild(errorElem);

              let completedErrorElem = document.getElementById(`data_update_script_${id}_error`);
              completedErrorElem.innerText = updatedDataScript.error;
            }
            if(updatedDataScript.status === "succeeded") {
              document.getElementById(`data_update_script_${id}_row`).classList.remove("alert-danger");
              if(document.getElementById(`data_update_script_${id}_button`)) {
                document.getElementById(`data_update_script_${id}_button`).remove();
              }
            }
          }
          clearInterval(pollForStatus);
        }
      });
      if ( counter > 0 ) {
        clearInterval(pollForStatus);
        this.setErrorBanner(
          runAtColumn,
          statusColumn,
          `Data Script with ${id} may take some time. Please refresh the page to check for the status.`,
          'alert-info'
        );
      }
    }, 1000)
  }

  checkForUpdatedDataScript(id, runAtColumn, statusColumn) {
    return fetch(`/admin/data_update_scripts/${id}`, {
      method: 'GET',
      headers: {
       'X-CSRF-Token': document.querySelector("meta[name='csrf-token']").content,
      },
      credentials: 'same-origin'
    }).then((response) => {
      if(response.ok) {
        return response.json().then(json => {
          let script = json.response;
          if(script.status === "succeeded" || script.status === "failed") {
            return script;
          } else {
            return false;
          }
        })
      } else {
        return response.json().then((response) => {
          this.setErrorBanner(
            runAtColumn,
            statusColumn,
            `Data Script ${id} - ${response.error}`,
            'alert-danger'
          );
          return true;
        });
      }
    })
  }

  setErrorBanner(runAtColumn, statusColumn, error, bannerClass) {
    let classList = document.getElementsByClassName('data-update-script__alert')[0].classList

    classList.add(bannerClass);
    classList.remove('hidden');
    document.getElementById('data-update-script__error').innerHTML = error;
    runAtColumn.innerHTML = '';
    statusColumn.innerHTML = '';
  }
}