#!/usr/bin/env tsx
/**
 * Check database permissions and provide helpful error messages
 * This script checks if the read-only user has SELECT permissions on required tables
 */

import { PrismaClient } from '@prisma/client';
import { prisma } from '../lib/db';

const REQUIRED_TABLES = [
  'photos',
  'people',
  'faces',
  'person_encodings',
  'tags',
  'phototaglinkage',
  'photo_favorites',
];

async function checkPermissions() {
  console.log('🔍 Checking database permissions...\n');

  // Extract username from DATABASE_URL
  const dbUrl = process.env.DATABASE_URL;
  if (!dbUrl) {
    console.error('❌ DATABASE_URL not found in environment variables');
    console.log('\nPlease add DATABASE_URL to your .env file:');
    console.log('DATABASE_URL="postgresql://username:password@localhost:5432/punimtag"');
    process.exit(1);
  }

  const match = dbUrl.match(/postgresql:\/\/([^:]+):/);
  if (!match) {
    console.error('❌ Could not parse username from DATABASE_URL');
    process.exit(1);
  }

  const username = match[1];
  console.log(`📋 Checking permissions for user: ${username}\n`);

  const errors: string[] = [];
  const successes: string[] = [];

  // Test each required table
  for (const table of REQUIRED_TABLES) {
    try {
      // Try to query the table
      let query: any;
      switch (table) {
        case 'photos':
          query = prisma.photo.findFirst();
          break;
        case 'people':
          query = prisma.person.findFirst();
          break;
        case 'faces':
          query = prisma.face.findFirst();
          break;
        case 'person_encodings':
          // Skip person_encodings if not in schema
          try {
            query = (prisma as any).personEncoding?.findFirst();
            if (!query) continue;
          } catch {
            continue;
          }
          break;
        case 'tags':
          query = prisma.tag.findFirst();
          break;
        case 'phototaglinkage':
          query = prisma.photoTagLinkage.findFirst();
          break;
        case 'photo_favorites':
          query = prisma.photoFavorite.findFirst();
          break;
        default:
          continue;
      }

      if (query) {
        await query;
        successes.push(`✅ ${table} - SELECT permission OK`);
      }
    } catch (error: any) {
      if (error.message?.includes('permission denied')) {
        errors.push(`❌ ${table} - Permission denied`);
      } else if (error.message?.includes('does not exist')) {
        errors.push(`⚠️  ${table} - Table does not exist (may be OK if not used)`);
      } else {
        errors.push(`❌ ${table} - ${error.message}`);
      }
    }
  }

  console.log('\n📊 Permission Check Results:\n');
  successes.forEach((msg) => console.log(msg));
  if (errors.length > 0) {
    console.log('');
    errors.forEach((msg) => console.log(msg));
  }

  if (errors.some((e) => e.includes('Permission denied'))) {
    console.log('\n❌ Permission errors detected!\n');
    console.log('To fix this, run the following SQL as a PostgreSQL superuser:\n');
    console.log('```bash');
    console.log(`psql -U postgres -d punimtag -f grant_readonly_permissions.sql`);
    console.log('```\n');
    console.log('Or manually run:\n');
    console.log('```sql');
    console.log(`-- Connect to database`);
    console.log(`\\c punimtag`);
    console.log('');
    console.log(`-- Grant permissions`);
    REQUIRED_TABLES.forEach((table) => {
      console.log(`GRANT SELECT ON TABLE ${table} TO ${username};`);
    });
    console.log(`GRANT USAGE ON SCHEMA public TO ${username};`);
    console.log(`GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA public TO ${username};`);
    console.log('```\n');
    process.exit(1);
  }

  console.log('\n✅ All required permissions are granted!');
  process.exit(0);
}

checkPermissions().catch((error) => {
  console.error('Error checking permissions:', error);
  process.exit(1);
});