import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';
import { execSync } from 'child_process';
import { SvelteKitPWA } from '@vite-pwa/sveltekit';
import compression from 'vite-plugin-compression';

export default defineConfig({
  plugins: [
    sveltekit(),
    compression({
      algorithm: 'gzip',
      ext: '.gz',
      threshold: 1024, // Compress files > 1KB
    }),
    compression({
      algorithm: 'brotliCompress',
      ext: '.br',
      threshold: 1024,
    }),
    SvelteKitPWA({
      strategies: 'generateSW',
      registerType: 'autoUpdate',
      workbox: {
        globPatterns: ['**/*.{js,css,html,ico,png,svg,woff,woff2,webp,avif}'],
        runtimeCaching: [
          {
            urlPattern: /^https:\/\/.*\.(?:png|jpg|jpeg|svg|gif|webp|avif)$/i,
            handler: 'CacheFirst',
            options: {
              cacheName: 'images-cache',
              expiration: {
                maxEntries: 200,
                maxAgeSeconds: 60 * 60 * 24 * 30 // 30 days
              }
            }
          },
          {
            // Cache API responses (relay responses) with cache-first strategy for slow connections
            urlPattern: /^wss?:\/\//i,
            handler: 'CacheFirst',
            options: {
              cacheName: 'api-cache',
              expiration: {
                maxEntries: 200, // Increased from 50
                maxAgeSeconds: 60 * 60 * 24 // 24 hours instead of 5 minutes (optimized for slow connections)
              }
            }
          },
          {
            // Cache static assets with stale-while-revalidate for better performance
            urlPattern: /\.(?:js|css|woff|woff2)$/i,
            handler: 'StaleWhileRevalidate',
            options: {
              cacheName: 'static-assets',
              expiration: {
                maxEntries: 100,
                maxAgeSeconds: 60 * 60 * 24 * 7 // 7 days
              }
            }
          },
          {
            // Cache HTML pages with network-first for freshness
            urlPattern: /\.html$/i,
            handler: 'NetworkFirst',
            options: {
              cacheName: 'html-cache',
              expiration: {
                maxEntries: 20,
                maxAgeSeconds: 60 * 60 * 24 // 1 day
              },
              networkTimeoutSeconds: 2
            }
          }
        ]
      },
      manifest: {
        name: 'aitherboard - Decentralized Messageboard on Nostr',
        short_name: 'aitherboard',
        description: 'A decentralized messageboard built on the Nostr protocol. Create threads, comment, react, and zap in a censorship-resistant environment.',
        theme_color: '#f1f5f9',
        background_color: '#ffffff',
        display: 'standalone',
        icons: [
          {
            src: 'favicon.ico',
            sizes: '64x64',
            type: 'image/x-icon'
          },
          {
            src: 'apple-touch-icon-180x180.png',
            sizes: '180x180',
            type: 'image/png',
            purpose: 'any maskable'
          },
          {
            src: 'apple-touch-icon-152x152.png',
            sizes: '152x152',
            type: 'image/png'
          },
          {
            src: 'apple-touch-icon-144x144.png',
            sizes: '144x144',
            type: 'image/png'
          },
          {
            src: 'apple-touch-icon-120x120.png',
            sizes: '120x120',
            type: 'image/png'
          },
          {
            src: 'apple-touch-icon-114x114.png',
            sizes: '114x114',
            type: 'image/png'
          }
        ]
      },
      devOptions: {
        enabled: false
      }
    }),
    {
      name: 'generate-healthz',
      buildStart() {
        try {
          execSync('node scripts/generate-healthz.js', { stdio: 'inherit' });
        } catch (error) {
          console.warn('Failed to generate healthz.json:', error);
        }
      }
    }
  ],
  server: {
    port: 5173,
    strictPort: false
  },
  build: {
    target: 'esnext',
    sourcemap: false,
    manifest: false,
    minify: 'terser',
    terserOptions: {
      compress: {
        drop_console: ['log', 'debug'], // Remove console.log and console.debug in production, keep error/warn
        passes: 2, // Multiple passes for better compression
      }
    },
    rollupOptions: {
      onwarn(warning, warn) {
        // Suppress warning about highlight.js default import - it's used in reactive contexts that Vite can't detect
        if (warning.message && 
            typeof warning.message === 'string' &&
            warning.message.includes('highlight.js') &&
            warning.message.includes('never used')) {
          return;
        }
        warn(warning);
      }
    }
  }
});