#!/usr/bin/env tsx
/**
 * Bulk church website scraper
 * Scrapes mass schedules from church websites and updates the database.
 *
 * Usage:
 *   npx tsx scripts/scrape-churches.ts --limit 100
 *   npx tsx scripts/scrape-churches.ts --limit 50 --max-failures 3
 *   npx tsx scripts/scrape-churches.ts --all                  # Process ALL eligible churches
 *   npx tsx scripts/scrape-churches.ts --all --language english
 *   npx tsx scripts/scrape-churches.ts --all --max-failures 3
 *   npx tsx scripts/scrape-churches.ts --ids id1,id2,id3
 *   npx tsx scripts/scrape-churches.ts --all --job-id <uuid>  # Resume/track existing job
 */

import dotenv from 'dotenv';
import path from 'path';
dotenv.config({ path: path.resolve(process.cwd(), '.env') });

import { Pool } from 'pg';
import { PrismaPg } from '@prisma/adapter-pg';
import { PrismaClient } from '@prisma/client';
import { scrapeAllChurches, scrapeChurch, countEligibleChurches } from '../src/lib/scraper-service';
import type { ScrapeJobResult } from '../src/lib/scraper-service';

// Fresh DB connection for scripts
const pool = new Pool({ connectionString: process.env.DATABASE_URL });
const adapter = new PrismaPg(pool);
const jobPrisma = new PrismaClient({ adapter });

let shuttingDown = false;

function formatDuration(seconds: number): string {
  if (seconds < 60) return `${seconds.toFixed(0)}s`;
  if (seconds < 3600) return `${Math.floor(seconds / 60)}m ${Math.floor(seconds % 60)}s`;
  const h = Math.floor(seconds / 3600);
  const m = Math.floor((seconds % 3600) / 60);
  return `${h}h ${m}m`;
}

// --- Job Tracking ---

async function createOrResumeJob(args: string[]): Promise<string | null> {
  const jobIdIndex = args.indexOf('--job-id');
  if (jobIdIndex !== -1) {
    const jobId = args[jobIdIndex + 1];
    await jobPrisma.backgroundJob.update({
      where: { id: jobId },
      data: { status: 'running', startedAt: new Date() },
    });
    return jobId;
  }
  return null;
}

async function createNewJob(language: string | null, config: Record<string, unknown>): Promise<string> {
  const job = await jobPrisma.backgroundJob.create({
    data: {
      type: 'scraper',
      language: language || 'generic',
      status: 'running',
      startedAt: new Date(),
      config,
    },
  });
  return job.id;
}

async function updateJobProgress(jobId: string, processed: number, succeeded: number, failed: number, itemsFound: number, totalItems: number): Promise<void> {
  await jobPrisma.backgroundJob.update({
    where: { id: jobId },
    data: { processed, succeeded, failed, itemsFound, totalItems },
  });
}

async function checkJobStopping(jobId: string): Promise<boolean> {
  const job = await jobPrisma.backgroundJob.findUnique({ where: { id: jobId } });
  return job?.status === 'stopping';
}

async function completeJob(jobId: string, error?: string): Promise<void> {
  await jobPrisma.backgroundJob.update({
    where: { id: jobId },
    data: {
      status: error ? 'failed' : 'completed',
      error,
      completedAt: new Date(),
    },
  });
}

async function main() {
  const args = process.argv.slice(2);
  const limitIndex = args.indexOf('--limit');
  const maxFailIndex = args.indexOf('--max-failures');
  const idsIndex = args.indexOf('--ids');
  const allMode = args.includes('--all');
  const langIndex = args.indexOf('--language');

  const maxFailures = maxFailIndex !== -1 ? parseInt(args[maxFailIndex + 1]) : 5;
  const ids = idsIndex !== -1 ? args[idsIndex + 1].split(',') : null;
  const language = langIndex !== -1 ? args[langIndex + 1] : null;

  // --ids mode: scrape specific churches
  if (ids) {
    console.log('============================================================');
    console.log('Church Website Scraper — Targeted Mode');
    console.log('============================================================');
    console.log(`Targeting ${ids.length} specific churches`);
    console.log(`Max failures: ${maxFailures}`);
    console.log(`Started: ${new Date().toISOString()}`);
    console.log('============================================================\n');

    const startTime = Date.now();
    const results = await Promise.all(ids.map((id) => scrapeChurch(id.trim())));
    printSummary(results, startTime);
    return;
  }

  // --all mode: batch loop through ALL eligible churches
  if (allMode) {
    const BATCH_SIZE = 100;
    const totalEligible = await countEligibleChurches(maxFailures);

    console.log('============================================================');
    console.log('Church Website Scraper — Full Run');
    console.log('============================================================');
    console.log(`Language:          ${language || 'all'}`);
    console.log(`Eligible churches: ${totalEligible.toLocaleString()}`);
    console.log(`Batch size:        ${BATCH_SIZE}`);
    console.log(`Max failures:      ${maxFailures}`);
    console.log(`Started:           ${new Date().toISOString()}`);
    console.log('============================================================\n');

    if (totalEligible === 0) {
      console.log('No eligible churches to scrape. All done!');
      return;
    }

    // Job tracking
    let jobId = await createOrResumeJob(args);
    if (!jobId) {
      jobId = await createNewJob(language, { allMode: true, maxFailures, language });
    }
    console.log(`Job ID: ${jobId}\n`);

    // Graceful shutdown handlers
    process.on('SIGINT', () => {
      if (shuttingDown) {
        console.log('\nForce quit.');
        process.exit(1);
      }
      console.log('\nShutting down gracefully (finishing current batch)...');
      shuttingDown = true;
    });
    process.on('SIGTERM', () => {
      console.log('\nSIGTERM received, shutting down after current batch...');
      shuttingDown = true;
    });

    const allResults: ScrapeJobResult[] = [];
    const globalStart = Date.now();
    let batchNum = 0;
    let totalSchedulesFound = 0;

    try {
      while (!shuttingDown) {
        batchNum++;
        const batchStart = Date.now();

        const batchResults = await scrapeAllChurches({ limit: BATCH_SIZE, maxFailures, language: language || undefined });

        if (batchResults.length === 0) {
          console.log('\nNo more eligible churches. All done!');
          break;
        }

        allResults.push(...batchResults);

        // Batch summary
        const batchElapsed = (Date.now() - batchStart) / 1000;
        const batchSuccess = batchResults.filter((r) => r.success).length;
        const batchSchedules = batchResults.reduce((sum, r) => sum + r.schedulesFound, 0);
        totalSchedulesFound += batchSchedules;

        // Overall progress
        const totalElapsed = (Date.now() - globalStart) / 1000;
        const rate = allResults.length / (totalElapsed / 3600);
        const remaining = totalEligible - allResults.length;
        const etaSeconds = remaining > 0 && rate > 0 ? (remaining / rate) * 3600 : 0;

        console.log(`\n--- Batch ${batchNum} (${batchResults.length} churches) ---`);
        console.log(`  Success: ${batchSuccess}/${batchResults.length} | Schedules: ${batchSchedules} | Time: ${formatDuration(batchElapsed)}`);
        console.log(`  Progress: ${allResults.length.toLocaleString()}/${totalEligible.toLocaleString()} (${((allResults.length / totalEligible) * 100).toFixed(1)}%)`);
        console.log(`  Rate: ${rate.toFixed(0)}/hr | ETA: ~${formatDuration(etaSeconds)}`);

        // Update job progress
        const succeeded = allResults.filter(r => r.success).length;
        const failed = allResults.filter(r => !r.success).length;
        await updateJobProgress(jobId, allResults.length, succeeded, failed, totalSchedulesFound, totalEligible);

        // Check if job was requested to stop (every 10 items)
        if (allResults.length % 10 === 0) {
          const stopping = await checkJobStopping(jobId);
          if (stopping) {
            console.log('\nJob stop requested via admin dashboard.');
            shuttingDown = true;
          }
        }

        if (shuttingDown) {
          console.log('\nGraceful shutdown: batch completed.');
          break;
        }
      }

      await completeJob(jobId);
    } catch (error) {
      await completeJob(jobId, error instanceof Error ? error.message : 'Unknown error');
      throw error;
    }

    printSummary(allResults, globalStart);
    return;
  }

  // Default mode: single batch with --limit
  const limit = limitIndex !== -1 ? parseInt(args[limitIndex + 1]) : 100;

  console.log('============================================================');
  console.log('Church Website Scraper');
  console.log('============================================================');
  console.log(`Language: ${language || 'all'}`);
  console.log(`Limit: ${limit}`);
  console.log(`Max failures: ${maxFailures}`);
  console.log(`Started: ${new Date().toISOString()}`);
  console.log('============================================================\n');

  // Job tracking for single batch mode too
  let jobId = await createOrResumeJob(args);
  if (!jobId) {
    jobId = await createNewJob(language, { limit, maxFailures, language });
  }
  console.log(`Job ID: ${jobId}\n`);

  const startTime = Date.now();
  try {
    const results = await scrapeAllChurches({ limit, maxFailures, language: language || undefined });
    const succeeded = results.filter(r => r.success).length;
    const failed = results.filter(r => !r.success).length;
    const totalSchedules = results.reduce((sum, r) => sum + r.schedulesFound, 0);
    await updateJobProgress(jobId, results.length, succeeded, failed, totalSchedules, limit);
    await completeJob(jobId);
    printSummary(results, startTime);
  } catch (error) {
    await completeJob(jobId, error instanceof Error ? error.message : 'Unknown error');
    throw error;
  }
}

function printSummary(results: ScrapeJobResult[], startTime: number) {
  const elapsed = (Date.now() - startTime) / 1000;
  const succeeded = results.filter((r) => r.success);
  const failed = results.filter((r) => !r.success);
  const totalSchedules = results.reduce((sum, r) => sum + r.schedulesFound, 0);
  const rate = results.length / (elapsed / 3600);

  console.log('\n============================================================');
  console.log('Scraping Summary');
  console.log('============================================================');
  console.log(`Churches processed:    ${results.length.toLocaleString()}`);
  console.log(`Succeeded:             ${succeeded.length.toLocaleString()}`);
  console.log(`Failed:                ${failed.length.toLocaleString()}`);
  console.log(`Total schedules found: ${totalSchedules.toLocaleString()}`);
  console.log(`Elapsed time:          ${formatDuration(elapsed)}`);
  console.log(`Average rate:          ${rate.toFixed(0)}/hr`);
  console.log(`Finished:              ${new Date().toISOString()}`);
  console.log('============================================================');

  if (failed.length > 0) {
    console.log(`\nFailed churches (${failed.length}):`);
    // Show first 50 failures to avoid overwhelming output
    const toShow = failed.slice(0, 50);
    for (const f of toShow) {
      console.log(`  - ${f.churchName}: ${f.error}`);
    }
    if (failed.length > 50) {
      console.log(`  ... and ${failed.length - 50} more`);
    }
  }
}

main().catch((error) => {
  console.error('Fatal error:', error);
  process.exit(1);
}).finally(async () => {
  await jobPrisma.$disconnect();
  await pool.end();
});