import fs from 'node:fs';
import path from 'node:path';
import type { NextConfig } from 'next';

const isStaticExportBuild = process.env.NEXT_EXPORT === '1';
const runtimeConfigOrigin = process.env.FUNNEL_RUNTIME_CONFIG_ORIGIN?.trim().replace(/\/+$/, '') || '';

// Inside the funnelsgrove monorepo, alias @funnelsgrove/* to the package
// sources so changes there rebuild live. Standalone copies (funnels created
// from this template) resolve the published packages from node_modules.
const insideMonorepo = fs.existsSync(path.resolve(__dirname, '../funnel-runtime/src/index.ts'));

const sourcePackageAliases: Record<string, string> = insideMonorepo
  ? {
      '@funnelsgrove/runtime/config/env.config': path.resolve(__dirname, '../funnel-runtime/src/config/env.config.ts'),
      '@funnelsgrove/runtime': path.resolve(__dirname, '../funnel-runtime/src/index.ts'),
      '@funnelsgrove/analytics': path.resolve(__dirname, '../funnel-analytics/src/index.ts'),
      '@funnelsgrove/payments': path.resolve(__dirname, '../funnel-payments/src/index.ts'),
    }
  : {};
const turbopackSourcePackageAliases: Record<string, string> = insideMonorepo
  ? {
      '@funnelsgrove/runtime/config/env.config': '../funnel-runtime/src/config/env.config.ts',
      '@funnelsgrove/runtime': '../funnel-runtime/src/index.ts',
      '@funnelsgrove/analytics': '../funnel-analytics/src/index.ts',
      '@funnelsgrove/payments': '../funnel-payments/src/index.ts',
    }
  : {};

const nextConfig: NextConfig = {
  ...(isStaticExportBuild
    ? { output: 'export' as const }
    : {
        rewrites: async () => [
          ...(runtimeConfigOrigin
            ? [{
                source: '/api/funnel-config/:path*',
                destination: `${runtimeConfigOrigin}/api/funnel-config/:path*`,
              }]
            : []),
          {
            source: '/ingest/static/:path*',
            destination: 'https://us-assets.i.posthog.com/static/:path*',
          },
          {
            source: '/ingest/array/:path*',
            destination: 'https://us-assets.i.posthog.com/array/:path*',
          },
          {
            source: '/ingest/:path*',
            destination: 'https://us.i.posthog.com/:path*',
          },
        ],
      }),
  compress: true,
  transpilePackages: ['@funnelsgrove/runtime', '@funnelsgrove/analytics', '@funnelsgrove/payments'],
  turbopack: {
    resolveAlias: turbopackSourcePackageAliases,
  },
  webpack: (config) => {
    config.resolve ??= {};
    config.resolve.alias = {
      ...(config.resolve.alias ?? {}),
      ...sourcePackageAliases,
    };

    return config;
  },
  images: {
    unoptimized: isStaticExportBuild,
    formats: ['image/avif', 'image/webp'],
    minimumCacheTTL: 60 * 60 * 24 * 30,
    dangerouslyAllowSVG: true,
  },
};

export default nextConfig;