const { createClient } = require('@supabase/supabase-js');
const fs = require('fs');
const path = require('path');

// Load environment variables
require('dotenv').config();

const supabaseUrl = process.env.SUPABASE_URL;
const supabaseServiceKey = process.env.SUPABASE_SERVICE_KEY;

if (!supabaseUrl || !supabaseServiceKey) {
    console.error('❌ Missing Supabase credentials');
    console.error('Make sure SUPABASE_URL and SUPABASE_SERVICE_KEY are set in .env');
    process.exit(1);
}

const supabase = createClient(supabaseUrl, supabaseServiceKey);

async function setupVectorDatabase() {
    try {
        console.log('🚀 Setting up Supabase vector database...');
        
        // Read the SQL setup script
        const sqlScript = fs.readFileSync(path.join(__dirname, 'supabase_vector_setup.sql'), 'utf8');
        
        // Split the script into individual statements
        const statements = sqlScript
            .split(';')
            .map(stmt => stmt.trim())
            .filter(stmt => stmt.length > 0 && !stmt.startsWith('--'));
        
        console.log(`📝 Executing ${statements.length} SQL statements...`);
        
        // Execute each statement
        for (let i = 0; i < statements.length; i++) {
            const statement = statements[i];
            if (statement.trim()) {
                console.log(`   Executing statement ${i + 1}/${statements.length}...`);
                
                const { data, error } = await supabase.rpc('exec_sql', {
                    sql: statement
                });
                
                if (error) {
                    console.error(`❌ Error executing statement ${i + 1}:`, error);
                    // Don't exit, continue with other statements
                } else {
                    console.log(`   ✅ Statement ${i + 1} executed successfully`);
                }
            }
        }
        
        // Test the setup by checking if the table exists
        console.log('🔍 Verifying table structure...');
        const { data: columns, error: tableError } = await supabase
            .from('document_chunks')
            .select('*')
            .limit(0);
            
        if (tableError) {
            console.error('❌ Error verifying table:', tableError);
        } else {
            console.log('✅ document_chunks table verified successfully');
        }
        
        // Test the search function
        console.log('🔍 Testing vector search function...');
        const testEmbedding = new Array(1536).fill(0.1); // Test embedding
        
        const { data: searchResult, error: searchError } = await supabase
            .rpc('match_document_chunks', {
                query_embedding: testEmbedding,
                match_threshold: 0.5,
                match_count: 5
            });
            
        if (searchError) {
            console.error('❌ Error testing search function:', searchError);
        } else {
            console.log('✅ Vector search function working correctly');
            console.log(`   Found ${searchResult ? searchResult.length : 0} results`);
        }
        
        console.log('🎉 Supabase vector database setup completed successfully!');
        
    } catch (error) {
        console.error('❌ Setup failed:', error);
        process.exit(1);
    }
}

// Alternative approach using direct SQL execution
async function setupVectorDatabaseDirect() {
    try {
        console.log('🚀 Setting up Supabase vector database (direct approach)...');
        
        // First, enable vector extension
        console.log('📦 Enabling pgvector extension...');
        const { error: extError } = await supabase.rpc('exec_sql', {
            sql: 'CREATE EXTENSION IF NOT EXISTS vector;'
        });
        
        if (extError) {
            console.log('⚠️  Extension error (might already exist):', extError.message);
        }
        
        // Create the table
        console.log('🏗️  Creating document_chunks table...');
        const createTableSQL = `
            CREATE TABLE IF NOT EXISTS document_chunks (
                id UUID DEFAULT gen_random_uuid() PRIMARY KEY,
                document_id TEXT NOT NULL,
                content TEXT NOT NULL,
                embedding VECTOR(1536),
                metadata JSONB DEFAULT '{}',
                chunk_index INTEGER NOT NULL,
                created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
                updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
            );
        `;
        
        const { error: tableError } = await supabase.rpc('exec_sql', {
            sql: createTableSQL
        });
        
        if (tableError) {
            console.error('❌ Error creating table:', tableError);
        } else {
            console.log('✅ Table created successfully');
        }
        
        // Test simple insert and select
        console.log('🧪 Testing basic operations...');
        
        const { data, error } = await supabase
            .from('document_chunks')
            .select('count', { count: 'exact' });
            
        if (error) {
            console.error('❌ Error testing table:', error);
        } else {
            console.log('✅ Table is accessible');
        }
        
        console.log('🎉 Basic vector database setup completed!');
        
    } catch (error) {
        console.error('❌ Setup failed:', error);
    }
}

// Run the setup
setupVectorDatabaseDirect();