/**
 * Recording worker using PgBoss for asynchronous browser recording operations
 */
import PgBoss, { Job } from 'pg-boss';
import logger from './logger';
import {
  initializeRemoteBrowserForRecording,
  destroyRemoteBrowser,
  interpretWholeWorkflow,
  stopRunningInterpretation,
  createRemoteBrowserForRun
} from './browser-management/controller';
import { WorkflowFile } from 'maxun-core';
import Run from './models/Run';
import Robot from './models/Robot';
import { browserPool } from './server';
import { Page } from 'playwright';
import { BinaryOutputService } from './storage/mino';
import { capture } from './utils/analytics';
import { googleSheetUpdateTasks, processGoogleSheetUpdates } from './workflow-management/integrations/gsheet';
import { airtableUpdateTasks, processAirtableUpdates } from './workflow-management/integrations/airtable';
import { RemoteBrowser } from './browser-management/classes/RemoteBrowser';
import { io as serverIo } from "./server";

const pgBossConnectionString = `postgres://${process.env.DB_USER}:${process.env.DB_PASSWORD}@${process.env.DB_HOST}:${process.env.DB_PORT}/${process.env.DB_NAME}`;

interface InitializeBrowserData {
  userId: string;
}

interface InterpretWorkflow {
  userId: string;
}

interface StopInterpretWorkflow {
  userId: string;
}

interface DestroyBrowserData {
  browserId: string;
  userId: string;
}

interface ExecuteRunData {
  userId: string;
  runId: string;
  browserId: string;
}

const pgBoss = new PgBoss({connectionString: pgBossConnectionString, schema: 'public'});

/**
 * Extract data safely from a job (single job or job array)
 */
function extractJobData<T>(job: Job<T> | Job<T>[]): T {
  if (Array.isArray(job)) {
    if (job.length === 0) {
      throw new Error('Empty job array received');
    }
    return job[0].data;
  }
  return job.data;
}

function AddGeneratedFlags(workflow: WorkflowFile) {
  const copy = JSON.parse(JSON.stringify(workflow));
  for (let i = 0; i < workflow.workflow.length; i++) {
    copy.workflow[i].what.unshift({
      action: 'flag',
      args: ['generated'],
    });
  }
  return copy;
};

/**
 * Function to reset browser state without creating a new browser
 */
async function resetBrowserState(browser: RemoteBrowser): Promise<boolean> {
  try {
    const currentPage = browser.getCurrentPage();
    if (!currentPage) {
      logger.log('error', 'No current page available to reset browser state');
      return false;
    }
    
    // Navigate to blank page to reset state
    await currentPage.goto('about:blank');
    
    // Clear browser storage
    await currentPage.evaluate(() => {
      try {
        localStorage.clear();
        sessionStorage.clear();
      } catch (e) {
        // Ignore errors in cleanup
      }
    });
    
    // Clear cookies
    const context = currentPage.context();
    await context.clearCookies();
    
    return true;
  } catch (error) {
    logger.log('error', `Failed to reset browser state`);
    return false;
  }
}

/**
 * Modified checkAndProcessQueuedRun function - only changes browser reset logic
 */
async function checkAndProcessQueuedRun(userId: string, browserId: string): Promise<boolean> {
  try {
    // Find the oldest queued run for this specific browser
    const queuedRun = await Run.findOne({
      where: {
        browserId: browserId,
        status: 'queued'
      },
      order: [['startedAt', 'ASC']]
    });
    
    if (!queuedRun) {
      logger.log('info', `No queued runs found for browser ${browserId}`);
      return false;
    }
    
    // Reset the browser state before next run
    const browser = browserPool.getRemoteBrowser(browserId);
    if (browser) {
      logger.log('info', `Resetting browser state for browser ${browserId} before next run`);
      await resetBrowserState(browser);
    }
    
    // Update the queued run to running status
    await queuedRun.update({
      status: 'running',
      log: 'Run started - using browser from previous run'
    });
    
    // Schedule the run execution
    await pgBoss.createQueue('execute-run');
    const executeJobId = await pgBoss.send('execute-run', {
      userId: userId,
      runId: queuedRun.runId,
      browserId: browserId
    });
    
    logger.log('info', `Scheduled queued run ${queuedRun.runId} to use browser ${browserId}, job ID: ${executeJobId}`);
    return true;
  } catch (error: unknown) {
    const errorMessage = error instanceof Error ? error.message : String(error);
    logger.log('error', `Error checking for queued runs: ${errorMessage}`);
    return false;
  }
}

/**
 * Modified processRunExecution function - only add browser reset
 */
async function processRunExecution(job: Job<ExecuteRunData>) {
  try {
    const data = job.data;
    logger.log('info', `Processing run execution job for runId: ${data.runId}, browserId: ${data.browserId}`);
    
    // Find the run
    const run = await Run.findOne({ where: { runId: data.runId } });
    if (!run) {
      logger.log('error', `Run ${data.runId} not found in database`);
      return { success: false };
    }

    const plainRun = run.toJSON();

    // Find the recording
    const recording = await Robot.findOne({ where: { 'recording_meta.id': plainRun.robotMetaId }, raw: true });
    if (!recording) {
      logger.log('error', `Recording for run ${data.runId} not found`);
      
      // Update run status to failed
      await run.update({
        status: 'failed',
        finishedAt: new Date().toLocaleString(),
        log: 'Failed: Recording not found',
      });
      
      // Check for queued runs even if this one failed
      await checkAndProcessQueuedRun(data.userId, data.browserId);
      
      return { success: false };
    }

    // Get the browser and execute the run
    const browser = browserPool.getRemoteBrowser(plainRun.browserId);
    let currentPage = browser?.getCurrentPage();
    
    if (!browser || !currentPage) {
      logger.log('error', `Browser or page not available for run ${data.runId}`);
      
      await pgBoss.fail(job.id, "Failed to get browser or page for run");
      
      // Even if this run failed, check for queued runs
      await checkAndProcessQueuedRun(data.userId, data.browserId);
      
      return { success: false };
    }

    try {
      // Reset the browser state before executing this run
      await resetBrowserState(browser);
      
      // Execute the workflow
      const workflow = AddGeneratedFlags(recording.recording);
      const interpretationInfo = await browser.interpreter.InterpretRecording(
        workflow, 
        currentPage, 
        (newPage: Page) => currentPage = newPage, 
        plainRun.interpreterSettings
      );
      
      // Process the results
      const binaryOutputService = new BinaryOutputService('maxun-run-screenshots');
      const uploadedBinaryOutput = await binaryOutputService.uploadAndStoreBinaryOutput(run, interpretationInfo.binaryOutput);
      
      // Update the run record with results
      await run.update({
        ...run,
        status: 'success',
        finishedAt: new Date().toLocaleString(),
        browserId: plainRun.browserId,
        log: interpretationInfo.log.join('\n'),
        serializableOutput: interpretationInfo.serializableOutput,
        binaryOutput: uploadedBinaryOutput,
      });

      // Track extraction metrics
      let totalRowsExtracted = 0;
      let extractedScreenshotsCount = 0;
      let extractedItemsCount = 0;

      if (run.dataValues.binaryOutput && run.dataValues.binaryOutput["item-0"]) {
        extractedScreenshotsCount = 1;
      }

      if (run.dataValues.serializableOutput && run.dataValues.serializableOutput["item-0"]) {
        const itemsArray = run.dataValues.serializableOutput["item-0"];
        extractedItemsCount = itemsArray.length;

        totalRowsExtracted = itemsArray.reduce((total, item) => {
          return total + Object.keys(item).length;
        }, 0);
      }

      console.log(`Extracted Items Count: ${extractedItemsCount}`);
      console.log(`Extracted Screenshots Count: ${extractedScreenshotsCount}`);
      console.log(`Total Rows Extracted: ${totalRowsExtracted}`);
      
      // Capture metrics
      capture(
        'maxun-oss-run-created-manual',
        {
          runId: data.runId,
          user_id: data.userId,
          created_at: new Date().toISOString(),
          status: 'success',
          totalRowsExtracted,
          extractedItemsCount,
          extractedScreenshotsCount,
        }
      );

      // Schedule updates for Google Sheets and Airtable
      try {
        googleSheetUpdateTasks[plainRun.runId] = {
          robotId: plainRun.robotMetaId,
          runId: plainRun.runId,
          status: 'pending',
          retries: 5,
        };

        airtableUpdateTasks[plainRun.runId] = {
          robotId: plainRun.robotMetaId,
          runId: plainRun.runId,
          status: 'pending',
          retries: 5,
        };

        processAirtableUpdates();
        processGoogleSheetUpdates();
      } catch (err: any) {
        logger.log('error', `Failed to update Google Sheet for run: ${plainRun.runId}: ${err.message}`);
      }

      serverIo.of(plainRun.browserId).emit('run-completed', {
        runId: data.runId,
        robotMetaId: plainRun.robotMetaId,
        robotName: recording.recording_meta.name,
        status: 'success',
        finishedAt: new Date().toLocaleString()
      });;
      
      // Check for and process queued runs before destroying the browser
      const queuedRunProcessed = await checkAndProcessQueuedRun(data.userId, plainRun.browserId);
      
      // Only destroy the browser if no queued run was found
      if (!queuedRunProcessed) {
        await destroyRemoteBrowser(plainRun.browserId, data.userId);
        logger.log('info', `No queued runs found for browser ${plainRun.browserId}, browser destroyed`);
      }
      
      return { success: true };
    } catch (executionError: any) {
      logger.log('error', `Run execution failed for run ${data.runId}: ${executionError.message}`);
      
      await run.update({
        status: 'failed',
        finishedAt: new Date().toLocaleString(),
        log: `Failed: ${executionError.message}`,
      });
      
      // Check for queued runs before destroying the browser
      const queuedRunProcessed = await checkAndProcessQueuedRun(data.userId, plainRun.browserId);
      
      // Only destroy the browser if no queued run was found
      if (!queuedRunProcessed) {
        try {
          await destroyRemoteBrowser(plainRun.browserId, data.userId);
          logger.log('info', `No queued runs found for browser ${plainRun.browserId}, browser destroyed`);
        } catch (cleanupError: any) {
          logger.log('warn', `Failed to clean up browser for failed run ${data.runId}: ${cleanupError.message}`);
        }
      }

      // Capture failure metrics
      capture(
        'maxun-oss-run-created-manual',
        {
          runId: data.runId,
          user_id: data.userId,
          created_at: new Date().toISOString(),
          status: 'failed',
          error_message: executionError.message,
        }
      );
      
      return { success: false };
    }
    
  } catch (error: unknown) {
    const errorMessage = error instanceof Error ? error.message : String(error);
    logger.log('error', `Failed to process run execution job: ${errorMessage}`);
    return { success: false };
  }
}


async function registerRunExecutionWorker() {
  try {
    // Worker for executing runs
    await pgBoss.work('execute-run', async (job: Job<ExecuteRunData> | Job<ExecuteRunData>[]) => {
      try {
        const singleJob = Array.isArray(job) ? job[0] : job;
        return await processRunExecution(singleJob);
      } catch (error: unknown) {
        const errorMessage = error instanceof Error ? error.message : String(error);
        logger.log('error', `Run execution job failed: ${errorMessage}`);
        throw error;
      }
    });

    // setInterval(checkForStuckQueuedRuns, 30000);
    
    logger.log('info', 'Run execution worker registered successfully');
  } catch (error: unknown) {
    const errorMessage = error instanceof Error ? error.message : String(error);
    logger.log('error', `Failed to register run execution worker: ${errorMessage}`);
  }
}


/**
 * Initialize PgBoss and register all workers
 */
async function startWorkers() {
  try {
    logger.log('info', 'Starting PgBoss worker...');
    await pgBoss.start();
    logger.log('info', 'PgBoss worker started successfully');

    // Worker for initializing browser recording
    await pgBoss.work('initialize-browser-recording', async (job: Job<InitializeBrowserData> | Job<InitializeBrowserData>[]) => {
      try {
        const data = extractJobData(job);
        const userId = data.userId;
        
        logger.log('info', `Starting browser initialization job for user: ${userId}`);
        const browserId = initializeRemoteBrowserForRecording(userId);
        logger.log('info', `Browser recording job completed with browserId: ${browserId}`);
        return { browserId };
      } catch (error: unknown) {
        const errorMessage = error instanceof Error ? error.message : String(error);
        logger.log('error', `Browser recording job failed: ${errorMessage}`);
        throw error;
      }
    });

    // Worker for stopping a browser
    await pgBoss.work('destroy-browser', async (job: Job<DestroyBrowserData> | Job<DestroyBrowserData>[]) => {
      try {
        const data = extractJobData(job);
        const { browserId, userId } = data;
        
        logger.log('info', `Starting browser destruction job for browser: ${browserId}`);
        const success = await destroyRemoteBrowser(browserId, userId);
        logger.log('info', `Browser destruction job completed with result: ${success}`);
        return { success };
      } catch (error: unknown) {
        const errorMessage = error instanceof Error ? error.message : String(error);
        logger.log('error', `Destroy browser job failed: ${errorMessage}`);
        throw error;
      }
    });

    // Worker for interpreting workflow
    await pgBoss.work('interpret-workflow', async (job: Job<InterpretWorkflow> | Job<InterpretWorkflow>[]) => {
      try {
        const data = extractJobData(job);
        const userId = data.userId;

        logger.log('info', 'Starting workflow interpretation job');
        await interpretWholeWorkflow(userId);
        logger.log('info', 'Workflow interpretation job completed');
        return { success: true };
      } catch (error: unknown) {
        const errorMessage = error instanceof Error ? error.message : String(error);
        logger.log('error', `Interpret workflow job failed: ${errorMessage}`);
        throw error;
      }
    });

    // Worker for stopping workflow interpretation
    await pgBoss.work('stop-interpretation', async (job: Job<StopInterpretWorkflow> | Job<StopInterpretWorkflow>[]) => {
      try {
        const data = extractJobData(job);
        const userId = data.userId;

        logger.log('info', 'Starting stop interpretation job');
        await stopRunningInterpretation(userId);
        logger.log('info', 'Stop interpretation job completed');
        return { success: true };
      } catch (error: unknown) {
        const errorMessage = error instanceof Error ? error.message : String(error);
        logger.log('error', `Stop interpretation job failed: ${errorMessage}`);
        throw error;
      }
    });
    
    // Register the run execution worker
    await registerRunExecutionWorker();

    logger.log('info', 'All recording workers registered successfully');
  } catch (error: unknown) {
    const errorMessage = error instanceof Error ? error.message : String(error);
    logger.log('error', `Failed to start PgBoss workers: ${errorMessage}`);
    process.exit(1);
  }
}

// Start all workers
startWorkers();

// Handle graceful shutdown
process.on('SIGTERM', async () => {
  logger.log('info', 'SIGTERM received, shutting down PgBoss...');
  await pgBoss.stop();
  process.exit(0);
});

process.on('SIGINT', async () => {
  logger.log('info', 'SIGINT received, shutting down PgBoss...');
  await pgBoss.stop();
  process.exit(0);
});

// For use in other files
export { pgBoss };