#!/usr/bin/env node
/**
 * Pulse CLI - RSS Feed Aggregator
 *
 * Commands:
 *   pulse start              Start the orchestrator (foreground mode)
 *   pulse add <url>          Add a new feed source
 *   pulse remove <id>        Remove a feed source
 *   pulse list               List all feed sources
 *   pulse fetch              One-shot fetch of all active feeds
 *   pulse status             Show feed health status
 *   pulse items [limit]      Show recent items (default: 20)
 */

import { Command } from 'commander';
import { getDatabase, migrate } from './infrastructure/db/index.js';
import { SqlStorage } from './modules/storage/index.js';
import { DatabaseDedup } from './modules/dedup/index.js';
import { HttpFetcher } from './modules/fetcher/index.js';
import { RssParser, AtomParser } from './modules/parser/index.js';
import { FeedOrchestrator } from './orchestrator/index.js';
import { Formatter } from './modules/formatter/formatter.js';
import { request } from 'undici';
import type { FeedSource } from './interfaces/feed.types.js';

const program = new Command();

program
  .name('pulse')
  .description('RSS feed aggregator')
  .version('0.1.0');

// Helper to create wired-up modules
async function createContext() {
  const db = getDatabase();

  // Auto-run migrations
  await migrate(db);

  const storage = new SqlStorage(db);
  const dedup = new DatabaseDedup(db);
  const fetcher = new HttpFetcher();
  const parser = {
    async parse(rawXml: string, source: string) {
      // Try RSS first, then Atom
      const rssParser = new RssParser();
      const atomParser = new AtomParser();

      try {
        return await rssParser.parse(rawXml, source);
      } catch {
        return await atomParser.parse(rawXml, source);
      }
    },
    supports() {
      return true;
    },
  };

  return { db, storage, dedup, fetcher, parser };
}

// Helper to generate feed ID from URL
function generateFeedId(url: string): string {
  let hash = 5381;
  for (let i = 0; i < url.length; i++) {
    hash = ((hash << 5) + hash) + url.charCodeAt(i);
  }
  return (hash >>> 0).toString(16);
}

// Helper to auto-detect feed format
async function detectFeedFormat(url: string): Promise<'rss' | 'atom'> {
  try {
    const { headers, body } = await request(url, {
      method: 'GET',
      headers: { 'User-Agent': 'Pulse-RSS-Fetcher/1.0' },
      signal: AbortSignal.timeout(10000),
    });

    const contentType = (headers['content-type'] as string | undefined) ?? '';
    const responseBody = await body.text();

    // Check content-type header
    if (contentType.toLowerCase().includes('atom')) {
      return 'atom';
    }

    // Check body content
    const trimmed = responseBody.trim().toLowerCase();
    if (trimmed.includes('<feed')) {
      return 'atom';
    }

    return 'rss';
  } catch {
    // Default to RSS if detection fails
    return 'rss';
  }
}

// Start command
program
  .command('start')
  .description('Start the orchestrator (runs in foreground)')
  .option('-c, --concurrency <number>', 'Number of concurrent fetches', '5')
  .action(async (options) => {
    try {
      const { db, storage, dedup, fetcher, parser } = await createContext();

      const orchestrator = new FeedOrchestrator({
        storage,
        fetcher,
        parser,
        dedup,
        concurrency: parseInt(options.concurrency, 10),
      });

      console.log('Starting Pulse orchestrator...');

      // Handle graceful shutdown
      const shutdown = async () => {
        console.log('\nShutting down gracefully...');
        await orchestrator.stop();
        // Note: Kysely doesn't have a close method, but we should clean up if needed
        console.log('Shutdown complete.');
        process.exit(0);
      };

      process.on('SIGINT', shutdown);
      process.on('SIGTERM', shutdown);

      await orchestrator.start();
      console.log('Orchestrator running. Press Ctrl+C to stop.');

      // Keep process alive
      await new Promise(() => {});
    } catch (error) {
      console.error('Failed to start orchestrator:', error instanceof Error ? error.message : error);
      process.exit(1);
    }
  });

// Add command
program
  .command('add <url>')
  .description('Add a new feed source')
  .option('-n, --name <name>', 'Display name for the feed')
  .option('-f, --format <format>', 'Feed format (rss or atom)', 'auto')
  .option('-i, --interval <ms>', 'Poll interval in milliseconds', '300000')
  .action(async (url, options) => {
    try {
      const { storage } = await createContext();

      const id = generateFeedId(url);

      // Check if already exists
      const existing = await storage.getFeedSourceById(id);
      if (existing) {
        console.error(`Feed already exists: ${url}`);
        process.exit(1);
      }

      // Auto-detect format if needed
      let format: 'rss' | 'atom';
      if (options.format === 'auto') {
        console.log('Detecting feed format...');
        format = await detectFeedFormat(url);
        console.log(`Detected format: ${format}`);
      } else if (options.format === 'rss' || options.format === 'atom') {
        format = options.format;
      } else {
        console.error(`Invalid format: ${options.format}. Use 'rss', 'atom', or 'auto'.`);
        process.exit(1);
      }

      const now = new Date();
      const source: FeedSource = {
        id,
        url,
        name: options.name ?? null,
        format,
        pollIntervalMs: parseInt(options.interval, 10),
        isActive: true,
        lastFetchedAt: null,
        lastSuccessAt: null,
        consecutiveFailures: 0,
        createdAt: now,
        updatedAt: now,
      };

      await storage.saveFeedSource(source);
      console.log(`Added feed: ${url}`);
      console.log(`  ID: ${id}`);
      console.log(`  Format: ${format}`);
      console.log(`  Interval: ${options.interval}ms`);
    } catch (error) {
      console.error('Failed to add feed:', error instanceof Error ? error.message : error);
      process.exit(1);
    }
  });

// Remove command
program
  .command('remove <id>')
  .description('Remove a feed source by ID')
  .action(async (id) => {
    try {
      const { storage } = await createContext();

      const existing = await storage.getFeedSourceById(id);
      if (!existing) {
        console.error(`Feed not found: ${id}`);
        process.exit(1);
      }

      await storage.deleteFeedSource(id);
      console.log(`Removed feed: ${existing.name ?? existing.url} (${id})`);
    } catch (error) {
      console.error('Failed to remove feed:', error instanceof Error ? error.message : error);
      process.exit(1);
    }
  });

// List command
program
  .command('list')
  .description('List all feed sources')
  .action(async () => {
    try {
      const { storage } = await createContext();

      const sources = await storage.getFeedSources();

      if (sources.length === 0) {
        console.log('No feed sources configured.');
        return;
      }

      console.log(`\n  ${sources.length} feed source(s):\n`);

      sources.forEach((source) => {
        const status = source.isActive ? '✓' : '✗';
        const health = source.consecutiveFailures > 0 ? ` (${source.consecutiveFailures} failures)` : '';
        console.log(`  ${status} ${source.name ?? source.url}`);
        console.log(`    ID: ${source.id}`);
        console.log(`    URL: ${source.url}`);
        console.log(`    Format: ${source.format}`);
        console.log(`    Interval: ${source.pollIntervalMs}ms`);
        if (source.lastSuccessAt) {
          console.log(`    Last success: ${source.lastSuccessAt.toLocaleString()}`);
        }
        console.log(`    ${health}`);
        console.log();
      });
    } catch (error) {
      console.error('Failed to list feeds:', error instanceof Error ? error.message : error);
      process.exit(1);
    }
  });

// Fetch command
program
  .command('fetch')
  .description('One-shot fetch of all active feeds')
  .action(async () => {
    try {
      const { db, storage, dedup, fetcher, parser } = await createContext();

      const orchestrator = new FeedOrchestrator({
        storage,
        fetcher,
        parser,
        dedup,
      });

      console.log('Fetching all active feeds...\n');

      const results = await orchestrator.processAllFeeds();

      let totalFound = 0;
      let totalNew = 0;

      for (const [sourceId, result] of results) {
        const source = await storage.getFeedSourceById(sourceId);
        const name = source?.name ?? source?.url ?? sourceId;

        if (result.success) {
          console.log(`✓ ${name}`);
          console.log(`  Found: ${result.itemsFound} items`);
          console.log(`  New: ${result.itemsNew} items`);
          totalFound += result.itemsFound;
          totalNew += result.itemsNew;
        } else {
          console.log(`✗ ${name}`);
          console.log(`  Error: ${result.error?.reason ?? 'Unknown error'}`);
        }
        console.log();
      }

      console.log(`Total: ${totalFound} items found, ${totalNew} new items`);
    } catch (error) {
      console.error('Failed to fetch feeds:', error instanceof Error ? error.message : error);
      process.exit(1);
    }
  });

// Status command
program
  .command('status')
  .description('Show feed health status')
  .action(async () => {
    try {
      const { db, storage, dedup, fetcher, parser } = await createContext();

      const orchestrator = new FeedOrchestrator({
        storage,
        fetcher,
        parser,
        dedup,
      });

      const health = await orchestrator.getFeedHealth();

      if (health.length === 0) {
        console.log('No feed sources configured.');
        return;
      }

      console.log(`\n  Feed Health Status:\n`);

      const healthy = health.filter((h) => h.isHealthy);
      const unhealthy = health.filter((h) => !h.isHealthy);

      if (healthy.length > 0) {
        console.log(`  Healthy (${healthy.length}):`);
        healthy.forEach((h) => {
          console.log(`    ✓ ${h.name ?? h.url}`);
        });
        console.log();
      }

      if (unhealthy.length > 0) {
        console.log(`  Unhealthy (${unhealthy.length}):`);
        unhealthy.forEach((h) => {
          console.log(`    ✗ ${h.name ?? h.url}`);
          console.log(`      Failures: ${h.consecutiveFailures}`);
          if (h.lastSuccessAt) {
            console.log(`      Last success: ${h.lastSuccessAt.toLocaleString()}`);
          } else {
            console.log(`      Never successfully fetched`);
          }
        });
        console.log();
      }
    } catch (error) {
      console.error('Failed to get status:', error instanceof Error ? error.message : error);
      process.exit(1);
    }
  });

// Items command
program
  .command('items [limit]')
  .description('Show recent items (default: 20)')
  .action(async (limitStr) => {
    try {
      const { storage } = await createContext();
      const formatter = new Formatter();

      const limit = parseInt(limitStr ?? '20', 10);
      const items = await storage.getRecent(limit);

      if (items.length === 0) {
        console.log('No items found.');
        return;
      }

      const output = await formatter.format(items, 'terminal');
      console.log(output);
    } catch (error) {
      console.error('Failed to get items:', error instanceof Error ? error.message : error);
      process.exit(1);
    }
  });

program.parse();