import { defineConfig } from 'vite';
import vue from '@vitejs/plugin-vue';
import { fileURLToPath, URL } from 'node:url';

export default defineConfig({
  plugins: [vue()],
  resolve: {
    alias: {
      '@': fileURLToPath(new URL('./src', import.meta.url))
    }
  },
  build: {
    // Production build optimizations
    target: 'es2015',
    minify: 'terser',
    sourcemap: true, // Enable source maps for production debugging
    rollupOptions: {
      output: {
        manualChunks: {
          // Split vendor chunks for better caching
          'vue-vendor': ['vue', 'vue-router'],
          highlight: ['highlight.js'],
          'virtual-scroller': ['vue-virtual-scroller']
        }
      }
    },
    // Increase chunk size warning limit (default is 500kb)
    chunkSizeWarningLimit: 600,
    // Enable CSS code splitting
    cssCodeSplit: true,
    // Asset inlining threshold (10kb)
    assetsInlineLimit: 10240
  },
  server: {
    host: '0.0.0.0',
    port: 5173,
    strictPort: true, // Fail if port is already in use instead of trying next available port
    proxy: {
      // API v1 proxy (legacy)
      '/api/challonge/v1': {
        target: 'https://api.challonge.com/v1',
        changeOrigin: true,
        rewrite: path => path.replace(/^\/api\/challonge\/v1/, ''),
        secure: true,
        headers: {
          Accept: 'application/json',
          'Content-Type': 'application/json'
        }
      },
      // API v2.1 proxy (current)
      '/api/challonge/v2.1': {
        target: 'https://api.challonge.com/v2.1',
        changeOrigin: true,
        rewrite: path => path.replace(/^\/api\/challonge\/v2\.1/, ''),
        secure: true,
        headers: {
          Accept: 'application/json',
          'Content-Type': 'application/vnd.api+json'
        }
      },
      // OAuth proxy (token exchange)
      '/api/oauth': {
        target: 'http://localhost:3001',
        changeOrigin: true,
        rewrite: path => path.replace(/^\/api\/oauth/, '/oauth'),
        secure: false
      },
      // Gamemaster API proxy
      '/api/gamemaster': {
        target: 'http://localhost:3001',
        changeOrigin: true,
        rewrite: path => path,
        secure: false
      }
    }
  }
});