//! Complete RAG workflow: Chunking -> Embedding -> Storage -> Retrieval
//!
//! This example demonstrates the full RAG pipeline including document
//! persistence in SurrealDB and similarity-based retrieval.
//!
//! Run with: `cargo run --example storage_integration`

#![allow(clippy::field_reassign_with_default)]

use provisioning_rag::{
    config::{EmbeddingConfig, IngestionConfig, VectorDbConfig},
    db::DbConnection,
    embeddings::EmbeddingEngine,
    ingestion::DocumentIngester,
};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Initialize logging
    tracing_subscriber::fmt::init();

    println!("🚀 Provisioning RAG System - Storage Integration Example\n");

    // Step 1: Setup database connection
    println!("Step 1: Connecting to SurrealDB...");
    let mut db_config = VectorDbConfig::default();
    db_config.url = "memory".to_string(); // Use in-memory for demo
    db_config.database = "rag_demo".to_string();

    let db = DbConnection::new(db_config).await?;
    db.initialize_schema().await?;
    println!("✓ Connected and schema initialized\n");

    // Step 2: Create embedding engine (local for demo)
    println!("Step 2: Creating embedding engine...");
    let mut embedding_config = EmbeddingConfig::default();
    embedding_config.provider = "local".to_string();
    let embedding_engine = EmbeddingEngine::new(embedding_config)?;
    println!("✓ Embedding engine ready (local mode)\n");

    // Step 3: Create document ingester
    println!("Step 3: Creating document ingester...");
    let ingestion_config = IngestionConfig::default();
    let ingester = DocumentIngester::new(ingestion_config, embedding_engine);
    println!("✓ Document ingester created\n");

    // Step 4: Prepare sample documents
    println!("Step 4: Processing sample documents...");
    let sample_markdown = r#"
# Provisioning Platform Architecture

## Overview
The provisioning platform provides unified infrastructure automation across multiple cloud providers.

## Key Components

### Orchestrator
Central task coordination service that manages all infrastructure operations.

### Control Center
Web-based management interface for monitoring and control.

### MCP Server
Model Context Protocol integration for AI-powered operations.

## Security
Enterprise-grade security with JWT authentication, Cedar authorization, and MFA support.
"#;

    // Chunk the document
    let chunks = ingester
        .chunking_engine()
        .chunk_markdown(sample_markdown, "architecture.md")?;

    println!("✓ Document chunked into {} chunks\n", chunks.len());

    // Step 5: Embed and store documents
    println!("Step 5: Embedding and storing documents...");
    let embedded_docs = ingester.embedding_engine().embed_batch(&chunks).await?;
    let stored_count = db.store_documents(&embedded_docs).await?;
    println!("✓ Stored {} documents\n", stored_count);

    // Step 6: Store deployment event
    println!("Step 6: Recording deployment event...");
    db.store_deployment_event(
        "librecloud",      // workspace
        "aws-prod",        // infrastructure
        "taskserv_create", // event_type
        "success",         // status
        "kubernetes",      // resource_name
        "aws",             // provider
    )
    .await?;
    println!("✓ Deployment event recorded\n");

    // Step 7: Get system statistics
    println!("Step 7: Retrieving system statistics...");
    let stats = db.get_statistics().await?;
    println!(
        "📊 RAG Statistics:\n   Documents: {}\n   Deployments: {}\n",
        stats.total_documents, stats.total_deployments
    );

    // Step 8: Demonstrate retrieval (mock similarity search)
    println!("Step 8: Performing similarity search...");
    if let Some(first_doc) = embedded_docs.first() {
        // Search for documents similar to the first document
        let similar_docs = db.search_similar(&first_doc.embedding, 5, 0.5).await?;

        println!("✓ Found {} similar documents", similar_docs.len());

        if let Some(result) = similar_docs.first() {
            println!(
                "\n📄 Top Result:\n   ID: {}\n   Type: {}\n   Size: {} chars\n",
                result.id,
                result.doc_type,
                result.content.len()
            );
        }
    }

    // Step 9: Demonstrate retrieval by ID
    println!("\nStep 9: Retrieving document by ID...");
    if let Some(first_doc) = embedded_docs.first() {
        if let Some(retrieved) = db.get_document(&first_doc.id).await? {
            println!(
                "✓ Retrieved: {} ({} bytes)",
                retrieved.id,
                retrieved.content.len()
            );
        }
    }

    println!("\n✅ Complete integration example finished!\n");
    println!("Key features demonstrated:");
    println!("  • Document chunking (heading-aware)");
    println!("  • Embedding generation");
    println!("  • Batch document storage");
    println!("  • Deployment event tracking");
    println!("  • Vector similarity search");
    println!("  • Document retrieval by ID");
    println!("  • System statistics");

    Ok(())
}