import { NextResponse } from 'next/server';
import { query } from '@/lib/db-postgres';
import { execInDevContainer } from '@/lib/dev-container';

/**
 * Builds a fast, high-level summary of the active project's codebase
 * to inject into the system prompt. This prevents the AI from having
 * to blind-search the repo to figure out the tech stack on every turn.
 */
export async function buildCodebaseSummary(projectId: string, projectSlug: string): Promise<string> {
  if (!projectId || !projectSlug) return "";

  try {
    // We run a fast bash script inside the dev container that finds package.json,
    // checks for Prisma/Drizzle schemas, and lists the root folders.
    // Time to execute: ~50ms.
    const bashScript = `
      cd /workspace/${projectSlug} 2>/dev/null || exit 0
      
      echo "=== DEPENDENCIES ==="
      if [ -f package.json ]; then
        node -e "const pkg=require('./package.json'); console.log('Dependencies:', Object.keys(pkg.dependencies||{}).join(', ')); console.log('DevDependencies:', Object.keys(pkg.devDependencies||{}).join(', '));" 2>/dev/null || echo "Found package.json"
      else
        echo "No package.json found"
      fi
      
      echo -e "\n=== ARCHITECTURE ==="
      if [ -d src/app ] || [ -d app ]; then echo "- Next.js App Router"; fi
      if [ -f prisma/schema.prisma ]; then echo "- Prisma ORM (prisma/schema.prisma)"; fi
      if [ -f drizzle.config.ts ]; then echo "- Drizzle ORM"; fi
      if [ -d .svelte-kit ]; then echo "- SvelteKit"; fi
      if [ -f vite.config.ts ] || [ -f vite.config.js ]; then echo "- Vite SPA"; fi
      if [ -f docker-compose.yml ]; then echo "- Docker Compose deployed"; fi
      
      echo -e "\n=== ROOT STRUCTURE ==="
      ls -la | awk '{print $9}' | grep -v "^$" | grep -v "^.$" | grep -v "^..$" | head -n 15 | tr '\n' ', '
    `;

    const result = await execInDevContainer(projectId, bashScript);
    
    if (result.code !== 0 || !result.stdout.trim()) {
      return "";
    }

    return `\n## CODEBASE SUMMARY (Auto-detected)
This is a quick summary of what currently exists in \`/workspace/${projectSlug}/\`:
\`\`\`text
${result.stdout.trim().slice(0, 1000)}
\`\`\`
Use this to orient yourself. Do not guess the stack; if it says Next.js and Prisma, use Next.js and Prisma.`;

  } catch (error) {
    console.warn("[Codebase Summary] Failed to generate summary:", error);
    return "";
  }
}