import { getActiveTransaction } from '@sentry/core';
import { browserPerformanceTimeOrigin, logger, htmlTreeAsString } from '@sentry/utils';
import { WINDOW } from '../types.js';
import { onCLS } from '../web-vitals/getCLS.js';
import { onFID } from '../web-vitals/getFID.js';
import { onLCP } from '../web-vitals/getLCP.js';
import { getVisibilityWatcher } from '../web-vitals/lib/getVisibilityWatcher.js';
import { observe } from '../web-vitals/lib/observe.js';
import { _startChild, isMeasurementValue } from './utils.js';

/**
 * Converts from milliseconds to seconds
 * @param time time in ms
 */
function msToSec(time) {
  return time / 1000;
}

function getBrowserPerformanceAPI() {
  // @ts-ignore we want to make sure all of these are available, even if TS is sure they are
  return WINDOW && WINDOW.addEventListener && WINDOW.performance;
}

let _performanceCursor = 0;

let _measurements = {};
let _lcpEntry;
let _clsEntry;

/**
 * Start tracking web vitals
 *
 * @returns A function that forces web vitals collection
 */
function startTrackingWebVitals() {
  const performance = getBrowserPerformanceAPI();
  if (performance && browserPerformanceTimeOrigin) {
    // @ts-ignore we want to make sure all of these are available, even if TS is sure they are
    if (performance.mark) {
      WINDOW.performance.mark('sentry-tracing-init');
    }
    _trackFID();
    const clsCallback = _trackCLS();
    const lcpCallback = _trackLCP();

    return () => {
      if (clsCallback) {
        clsCallback();
      }
      if (lcpCallback) {
        lcpCallback();
      }
    };
  }

  return () => undefined;
}

/**
 * Start tracking long tasks.
 */
function startTrackingLongTasks() {
  const entryHandler = (entries) => {
    for (const entry of entries) {
      const transaction = getActiveTransaction() ;
      if (!transaction) {
        return;
      }
      const startTime = msToSec((browserPerformanceTimeOrigin ) + entry.startTime);
      const duration = msToSec(entry.duration);

      transaction.startChild({
        description: 'Main UI thread blocked',
        op: 'ui.long-task',
        startTimestamp: startTime,
        endTimestamp: startTime + duration,
      });
    }
  };

  observe('longtask', entryHandler);
}

/**
 * Start tracking interaction events.
 */
function startTrackingInteractions() {
  const entryHandler = (entries) => {
    for (const entry of entries) {
      const transaction = getActiveTransaction() ;
      if (!transaction) {
        return;
      }

      if (entry.name === 'click') {
        const startTime = msToSec((browserPerformanceTimeOrigin ) + entry.startTime);
        const duration = msToSec(entry.duration);

        transaction.startChild({
          description: htmlTreeAsString(entry.target),
          op: `ui.interaction.${entry.name}`,
          startTimestamp: startTime,
          endTimestamp: startTime + duration,
        });
      }
    }
  };

  observe('event', entryHandler, { durationThreshold: 0 });
}

/** Starts tracking the Cumulative Layout Shift on the current page. */
function _trackCLS() {
  // See:
  // https://web.dev/evolving-cls/
  // https://web.dev/cls-web-tooling/
  return onCLS(metric => {
    const entry = metric.entries.pop();
    if (!entry) {
      return;
    }

    (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.log('[Measurements] Adding CLS');
    _measurements['cls'] = { value: metric.value, unit: '' };
    _clsEntry = entry ;
  });
}

/** Starts tracking the Largest Contentful Paint on the current page. */
function _trackLCP() {
  return onLCP(metric => {
    const entry = metric.entries.pop();
    if (!entry) {
      return;
    }

    (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.log('[Measurements] Adding LCP');
    _measurements['lcp'] = { value: metric.value, unit: 'millisecond' };
    _lcpEntry = entry ;
  });
}

/** Starts tracking the First Input Delay on the current page. */
function _trackFID() {
  onFID(metric => {
    const entry = metric.entries.pop();
    if (!entry) {
      return;
    }

    const timeOrigin = msToSec(browserPerformanceTimeOrigin );
    const startTime = msToSec(entry.startTime);
    (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.log('[Measurements] Adding FID');
    _measurements['fid'] = { value: metric.value, unit: 'millisecond' };
    _measurements['mark.fid'] = { value: timeOrigin + startTime, unit: 'second' };
  });
}

/** Add performance related spans to a transaction */
function addPerformanceEntries(transaction) {
  const performance = getBrowserPerformanceAPI();
  if (!performance || !WINDOW.performance.getEntries || !browserPerformanceTimeOrigin) {
    // Gatekeeper if performance API not available
    return;
  }

  (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.log('[Tracing] Adding & adjusting spans using Performance API');
  const timeOrigin = msToSec(browserPerformanceTimeOrigin);

  const performanceEntries = performance.getEntries();

  let responseStartTimestamp;
  let requestStartTimestamp;

  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  performanceEntries.slice(_performanceCursor).forEach((entry) => {
    const startTime = msToSec(entry.startTime);
    const duration = msToSec(entry.duration);

    if (transaction.op === 'navigation' && timeOrigin + startTime < transaction.startTimestamp) {
      return;
    }

    switch (entry.entryType) {
      case 'navigation': {
        _addNavigationSpans(transaction, entry, timeOrigin);
        responseStartTimestamp = timeOrigin + msToSec(entry.responseStart);
        requestStartTimestamp = timeOrigin + msToSec(entry.requestStart);
        break;
      }
      case 'mark':
      case 'paint':
      case 'measure': {
        _addMeasureSpans(transaction, entry, startTime, duration, timeOrigin);

        // capture web vitals
        const firstHidden = getVisibilityWatcher();
        // Only report if the page wasn't hidden prior to the web vital.
        const shouldRecord = entry.startTime < firstHidden.firstHiddenTime;

        if (entry.name === 'first-paint' && shouldRecord) {
          (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.log('[Measurements] Adding FP');
          _measurements['fp'] = { value: entry.startTime, unit: 'millisecond' };
        }
        if (entry.name === 'first-contentful-paint' && shouldRecord) {
          (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.log('[Measurements] Adding FCP');
          _measurements['fcp'] = { value: entry.startTime, unit: 'millisecond' };
        }
        break;
      }
      case 'resource': {
        const resourceName = (entry.name ).replace(WINDOW.location.origin, '');
        _addResourceSpans(transaction, entry, resourceName, startTime, duration, timeOrigin);
        break;
      }
      // Ignore other entry types.
    }
  });

  _performanceCursor = Math.max(performanceEntries.length - 1, 0);

  _trackNavigator(transaction);

  // Measurements are only available for pageload transactions
  if (transaction.op === 'pageload') {
    // Generate TTFB (Time to First Byte), which measured as the time between the beginning of the transaction and the
    // start of the response in milliseconds
    if (typeof responseStartTimestamp === 'number') {
      (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.log('[Measurements] Adding TTFB');
      _measurements['ttfb'] = {
        value: (responseStartTimestamp - transaction.startTimestamp) * 1000,
        unit: 'millisecond',
      };

      if (typeof requestStartTimestamp === 'number' && requestStartTimestamp <= responseStartTimestamp) {
        // Capture the time spent making the request and receiving the first byte of the response.
        // This is the time between the start of the request and the start of the response in milliseconds.
        _measurements['ttfb.requestTime'] = {
          value: (responseStartTimestamp - requestStartTimestamp) * 1000,
          unit: 'millisecond',
        };
      }
    }

    ['fcp', 'fp', 'lcp'].forEach(name => {
      if (!_measurements[name] || timeOrigin >= transaction.startTimestamp) {
        return;
      }
      // The web vitals, fcp, fp, lcp, and ttfb, all measure relative to timeOrigin.
      // Unfortunately, timeOrigin is not captured within the transaction span data, so these web vitals will need
      // to be adjusted to be relative to transaction.startTimestamp.
      const oldValue = _measurements[name].value;
      const measurementTimestamp = timeOrigin + msToSec(oldValue);

      // normalizedValue should be in milliseconds
      const normalizedValue = Math.abs((measurementTimestamp - transaction.startTimestamp) * 1000);
      const delta = normalizedValue - oldValue;

      (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) &&
        logger.log(`[Measurements] Normalized ${name} from ${oldValue} to ${normalizedValue} (${delta})`);
      _measurements[name].value = normalizedValue;
    });

    const fidMark = _measurements['mark.fid'];
    if (fidMark && _measurements['fid']) {
      // create span for FID
      _startChild(transaction, {
        description: 'first input delay',
        endTimestamp: fidMark.value + msToSec(_measurements['fid'].value),
        op: 'ui.action',
        startTimestamp: fidMark.value,
      });

      // Delete mark.fid as we don't want it to be part of final payload
      delete _measurements['mark.fid'];
    }

    // If FCP is not recorded we should not record the cls value
    // according to the new definition of CLS.
    if (!('fcp' in _measurements)) {
      delete _measurements.cls;
    }

    Object.keys(_measurements).forEach(measurementName => {
      transaction.setMeasurement(
        measurementName,
        _measurements[measurementName].value,
        _measurements[measurementName].unit,
      );
    });

    _tagMetricInfo(transaction);
  }

  _lcpEntry = undefined;
  _clsEntry = undefined;
  _measurements = {};
}

/** Create measure related spans */
function _addMeasureSpans(
  transaction,
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  entry,
  startTime,
  duration,
  timeOrigin,
) {
  const measureStartTimestamp = timeOrigin + startTime;
  const measureEndTimestamp = measureStartTimestamp + duration;

  _startChild(transaction, {
    description: entry.name ,
    endTimestamp: measureEndTimestamp,
    op: entry.entryType ,
    startTimestamp: measureStartTimestamp,
  });

  return measureStartTimestamp;
}

/** Instrument navigation entries */
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function _addNavigationSpans(transaction, entry, timeOrigin) {
  ['unloadEvent', 'redirect', 'domContentLoadedEvent', 'loadEvent', 'connect'].forEach(event => {
    _addPerformanceNavigationTiming(transaction, entry, event, timeOrigin);
  });
  _addPerformanceNavigationTiming(transaction, entry, 'secureConnection', timeOrigin, 'TLS/SSL', 'connectEnd');
  _addPerformanceNavigationTiming(transaction, entry, 'fetch', timeOrigin, 'cache', 'domainLookupStart');
  _addPerformanceNavigationTiming(transaction, entry, 'domainLookup', timeOrigin, 'DNS');
  _addRequest(transaction, entry, timeOrigin);
}

/** Create performance navigation related spans */
function _addPerformanceNavigationTiming(
  transaction,
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  entry,
  event,
  timeOrigin,
  description,
  eventEnd,
) {
  const end = eventEnd ? (entry[eventEnd] ) : (entry[`${event}End`] );
  const start = entry[`${event}Start`] ;
  if (!start || !end) {
    return;
  }
  _startChild(transaction, {
    op: 'browser',
    description: description || event,
    startTimestamp: timeOrigin + msToSec(start),
    endTimestamp: timeOrigin + msToSec(end),
  });
}

/** Create request and response related spans */
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function _addRequest(transaction, entry, timeOrigin) {
  _startChild(transaction, {
    op: 'browser',
    description: 'request',
    startTimestamp: timeOrigin + msToSec(entry.requestStart ),
    endTimestamp: timeOrigin + msToSec(entry.responseEnd ),
  });

  _startChild(transaction, {
    op: 'browser',
    description: 'response',
    startTimestamp: timeOrigin + msToSec(entry.responseStart ),
    endTimestamp: timeOrigin + msToSec(entry.responseEnd ),
  });
}

/** Create resource-related spans */
function _addResourceSpans(
  transaction,
  entry,
  resourceName,
  startTime,
  duration,
  timeOrigin,
) {
  // we already instrument based on fetch and xhr, so we don't need to
  // duplicate spans here.
  if (entry.initiatorType === 'xmlhttprequest' || entry.initiatorType === 'fetch') {
    return;
  }

  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  const data = {};
  if ('transferSize' in entry) {
    data['http.response_transfer_size'] = entry.transferSize;
  }
  if ('encodedBodySize' in entry) {
    data['http.response_content_length'] = entry.encodedBodySize;
  }
  if ('decodedBodySize' in entry) {
    data['http.decoded_response_content_length'] = entry.decodedBodySize;
  }
  if ('renderBlockingStatus' in entry) {
    data['resource.render_blocking_status'] = entry.renderBlockingStatus;
  }

  const startTimestamp = timeOrigin + startTime;
  const endTimestamp = startTimestamp + duration;

  _startChild(transaction, {
    description: resourceName,
    endTimestamp,
    op: entry.initiatorType ? `resource.${entry.initiatorType}` : 'resource.other',
    startTimestamp,
    data,
  });
}

/**
 * Capture the information of the user agent.
 */
function _trackNavigator(transaction) {
  const navigator = WINDOW.navigator ;
  if (!navigator) {
    return;
  }

  // track network connectivity
  const connection = navigator.connection;
  if (connection) {
    if (connection.effectiveType) {
      transaction.setTag('effectiveConnectionType', connection.effectiveType);
    }

    if (connection.type) {
      transaction.setTag('connectionType', connection.type);
    }

    if (isMeasurementValue(connection.rtt)) {
      _measurements['connection.rtt'] = { value: connection.rtt, unit: 'millisecond' };
    }
  }

  if (isMeasurementValue(navigator.deviceMemory)) {
    transaction.setTag('deviceMemory', `${navigator.deviceMemory} GB`);
  }

  if (isMeasurementValue(navigator.hardwareConcurrency)) {
    transaction.setTag('hardwareConcurrency', String(navigator.hardwareConcurrency));
  }
}

/** Add LCP / CLS data to transaction to allow debugging */
function _tagMetricInfo(transaction) {
  if (_lcpEntry) {
    (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.log('[Measurements] Adding LCP Data');

    // Capture Properties of the LCP element that contributes to the LCP.

    if (_lcpEntry.element) {
      transaction.setTag('lcp.element', htmlTreeAsString(_lcpEntry.element));
    }

    if (_lcpEntry.id) {
      transaction.setTag('lcp.id', _lcpEntry.id);
    }

    if (_lcpEntry.url) {
      // Trim URL to the first 200 characters.
      transaction.setTag('lcp.url', _lcpEntry.url.trim().slice(0, 200));
    }

    transaction.setTag('lcp.size', _lcpEntry.size);
  }

  // See: https://developer.mozilla.org/en-US/docs/Web/API/LayoutShift
  if (_clsEntry && _clsEntry.sources) {
    (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.log('[Measurements] Adding CLS Data');
    _clsEntry.sources.forEach((source, index) =>
      transaction.setTag(`cls.source.${index + 1}`, htmlTreeAsString(source.node)),
    );
  }
}

export { _addMeasureSpans, _addResourceSpans, addPerformanceEntries, startTrackingInteractions, startTrackingLongTasks, startTrackingWebVitals };
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