//! Desktop Indexing Demo - Production Indexer Showcase
//!
//! This example demonstrates:
//! 1. Starting up Spacedrive Core
//! 2. Creating/opening a library
//! 3. Adding the user's desktop as a location
//! 4. Running the production indexer with all features:
//!    - Smart filtering (skip system files)
//!    - Incremental indexing with change detection
//!    - Performance metrics and reporting
//!    - Multi-phase processing
//! 5. Showing detailed results and metrics

use sd_core::{
	config::{AppConfig, JobLoggingConfig},
	infra::{db::entities, event::Event, job::types::JobStatus},
	location::{create_location, IndexMode, LocationCreateArgs},
	Core,
};
use sea_orm::{
	ActiveModelTrait, ColumnTrait, EntityTrait, PaginatorTrait, QueryFilter, QuerySelect,
};
use std::path::PathBuf;
use tokio::time::{sleep, Duration};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
	// Initialize logging with more detail
	tracing_subscriber::fmt()
		.with_env_filter("sd_core=debug,desktop_indexing_demo=info")
		.init();

	println!("=== Spacedrive 2 Desktop Indexing Demo ===\n");

	// 1. Initialize Spacedrive Core with job logging enabled
	println!("1. Initializing Spacedrive Core...");
	let data_dir = PathBuf::from("./data/spacedrive-desktop-demo");

	// Enable job logging by modifying the config before core initialization
	{
		let mut config = AppConfig::load_from(&data_dir)
			.unwrap_or_else(|_| AppConfig::default_with_dir(data_dir.clone()));

		// Enable job logging - hardcoded for demo
		config.job_logging = JobLoggingConfig {
			enabled: true,
			log_directory: "job_logs".to_string(),
			max_file_size: 10 * 1024 * 1024, // 10MB
			include_debug: true,             // Include debug logs for full detail
		};

		config.save()?;
		println!("   Job logging enabled (logs stored per-library)");
	}

	let core = Core::new(data_dir.clone()).await?;
	println!("   Core initialized with job logging");
	println!("   Device ID: {}", core.device.device_id()?);
	println!("   Data directory: {:?}", data_dir);

	// 2. Get or create library
	println!("2. Setting up library...");
	let library = if core.libraries.list().await.is_empty() {
		println!("   Creating new library...");
		let lib = core
			.libraries
			.create_library("Desktop Demo Library", None, core.context.clone())
			.await?;
		println!("   Created library: {}", lib.name().await);
		lib
	} else {
		let libs = core.libraries.list().await;
		let lib = libs.into_iter().next().unwrap();
		println!("   Using existing library: {}", lib.name().await);
		lib
	};
	println!("   Library ID: {}", library.id());
	println!("   Library path: {}\n", library.path().display());

	// 3. Set up desktop location
	println!("3. Adding Desktop as a location...");
	let desktop_path = dirs::desktop_dir().ok_or("Could not find desktop directory")?;
	println!("    Desktop path: {}", desktop_path.display());

	// Register device in the database first
	let db = library.db();
	let device = core.device.to_device()?;

	// Check if device already exists, if not create it
	let device_record = match entities::device::Entity::find()
		.filter(entities::device::Column::Uuid.eq(device.id))
		.one(db.conn())
		.await?
	{
		Some(existing) => {
			println!("   Device already registered");
			existing
		}
		None => {
			println!("   Registering device...");
			let device_model: entities::device::ActiveModel = device.into();
			let inserted = device_model.insert(db.conn()).await?;
			println!("   Device registered with ID: {}", inserted.id);
			inserted
		}
	};

	// Use production location management to create location and dispatch indexer job
	println!("   Creating location with production job dispatch...");
	let location_args = LocationCreateArgs {
		path: desktop_path.clone(),
		name: Some("Desktop".to_string()),
		index_mode: IndexMode::Deep, // Deep indexing with content analysis
	};

	let location_db_id = create_location(
		library.clone(),
		&core.events,
		location_args,
		device_record.id,
	)
	.await?;

	println!("   Location created with DB ID: {}", location_db_id);
	println!("   Indexer job dispatched through production job manager!");

	// Add to file watcher (optional - for real-time monitoring)
	// Note: location_id here would need to be retrieved from the database record
	// For simplicity, we'll skip the file watcher for now since the main demo is indexing
	println!("    Production job system is now running indexing...\n");

	// 4. Monitor production indexer with new features
	println!("4. Production Indexer in Action!");
	println!("   New Features Showcase:");
	println!("      Smart Filtering - Skips system files, caches, node_modules");
	println!("      Incremental Indexing - Detects changes via inode tracking");
	println!("      Performance Metrics - Detailed timing and throughput");
	println!("      Multi-phase Processing - Discovery → Processing → Content");
	println!("   Target: {}", desktop_path.display());

	// Set up event monitoring to track job progress
	println!("   Setting up real-time job monitoring...");
	let mut event_subscriber = core.events.subscribe();

	// Spawn event listener to monitor indexing progress
	let events_handle = tokio::spawn(async move {
		while let Ok(event) = event_subscriber.recv().await {
			match event {
				Event::IndexingStarted { location_id } => {
					println!("   Indexing started for location: {}", location_id);
				}
				Event::IndexingCompleted {
					location_id,
					total_files,
					total_dirs,
				} => {
					println!("   Indexing completed for location: {}", location_id);
					println!("      Files indexed: {}", total_files);
					println!("      Directories indexed: {}", total_dirs);
					break; // Exit the event loop when indexing is done
				}
				Event::IndexingFailed { location_id, error } => {
					println!(
						"   Indexing failed for location: {} - {}",
						location_id, error
					);
					break;
				}
				Event::FilesIndexed { count, .. } => {
					println!("   Progress: {} files processed", count);
				}
				Event::JobProgress {
					job_id,
					job_type,
					progress,
					message,
					generic_progress: _,
				} => {
					// Show production indexer progress details
					if let Some(msg) = message {
						println!(
							"   Job {} [{}]: {} ({}%)",
							job_id,
							job_type,
							msg,
							(progress * 100.0) as u8
						);
					} else {
						println!(
							"   Job {} [{}]: {}%",
							job_id,
							job_type,
							(progress * 100.0) as u8
						);
					}
				}
				_ => {} // Ignore other events
			}
		}
	});

	println!("   Waiting for indexing to complete...");
	println!("   Production Indexer Features Active:");
	println!("      Smart Filtering - Automatically skipping:");
	println!("         • Hidden files (.DS_Store, Thumbs.db)");
	println!("         • Dev directories (node_modules, .git, target)");
	println!("         • Cache folders (__pycache__, .cache)");
	println!("         • Large files (>4GB)");
	println!("      Change Detection - Using inode tracking for:");
	println!("         • Fast incremental updates");
	println!("         • Move/rename detection");
	println!("         • Modified file tracking");
	println!("      Performance Optimization:");
	println!("         • Batch processing (1000 items/batch)");
	println!("         • Path prefix deduplication");
	println!("         • Parallel content processing");

	// Let's show what files are actually in the desktop
	println!("\n   Desktop contents preview:");
	let mut file_count = 0;
	let mut dir_count = 0;
	let mut total_size = 0u64;

	if let Ok(entries) = tokio::fs::read_dir(&desktop_path).await {
		let mut entries = entries;
		while let Ok(Some(entry)) = entries.next_entry().await {
			if let Ok(metadata) = entry.metadata().await {
				if metadata.is_file() {
					file_count += 1;
					total_size += metadata.len();
					if file_count <= 5 {
						// Show first 5 files
						println!("      {}", entry.file_name().to_string_lossy());
					}
				} else if metadata.is_dir() {
					dir_count += 1;
					if dir_count <= 3 {
						// Show first 3 dirs
						println!("      {}/", entry.file_name().to_string_lossy());
					}
				}
			}
		}
	}

	if file_count > 5 {
		println!("      ... and {} more files", file_count - 5);
	}
	if dir_count > 3 {
		println!("      ... and {} more directories", dir_count - 3);
	}

	println!("\n   Discovery Summary:");
	println!("      Files found: {}", file_count);
	println!("      Directories found: {}", dir_count);
	println!(
		"      Total size: {:.2} MB",
		total_size as f64 / 1024.0 / 1024.0
	);

	// Smart job completion monitoring with checkpoint-based timeout
	println!("\n   Monitoring job completion with smart timeout...");
	println!("   Will track checkpoint progress and wait for actual completion");

	let mut last_checkpoint_size = 0u64;
	let mut stall_time = std::time::Instant::now();
	let stall_timeout = Duration::from_secs(120); // Timeout if no progress for 2 minutes
	let poll_interval = Duration::from_secs(5); // Check every 5 seconds

	// Keep the event listener running but don't block on it
	let mut events_completed = false;

	loop {
		// Check if the event listener got completion
		if !events_completed && events_handle.is_finished() {
			events_completed = true;
			println!("   Event listener detected job completion!");
		}

		// Poll job status from the job manager
		let job_status = library.jobs().list_jobs(None).await?;
		let running_jobs = library.jobs().list_jobs(Some(JobStatus::Running)).await?;
		let completed_jobs = library.jobs().list_jobs(Some(JobStatus::Completed)).await?;

		// Also check how many entries have been created so far
		let current_entry_count = entities::entry::Entity::find()
			.count(db.conn())
			.await
			.unwrap_or(0);

		println!(
			"   Job Status: {} running, {} completed, {} total",
			running_jobs.len(),
			completed_jobs.len(),
			job_status.len()
		);
		println!("   Database entries so far: {}", current_entry_count);

		// Check checkpoint progress by querying actual checkpoint data
		let checkpoint_estimate = {
			// Try to get the latest checkpoint size from the jobs database
			if let Ok(metadata) =
				tokio::fs::metadata("./data/spacedrive-desktop-demo/jobs.db").await
			{
				metadata.len()
			} else {
				0
			}
		};

		if checkpoint_estimate > last_checkpoint_size {
			println!(
				"   Progress detected: {} bytes checkpoint data",
				checkpoint_estimate
			);
			last_checkpoint_size = checkpoint_estimate;
			stall_time = std::time::Instant::now(); // Reset stall timer
		}

		// Check completion conditions
		if running_jobs.is_empty() && !completed_jobs.is_empty() {
			println!("   All jobs completed successfully!");
			break;
		} else if running_jobs.is_empty() && events_completed {
			println!("   No running jobs and events indicate completion!");
			break;
		} else if stall_time.elapsed() > stall_timeout {
			println!(
				"    Job appears stalled (no progress for {} seconds)",
				stall_timeout.as_secs()
			);
			println!("   Final checkpoint size: {} bytes", checkpoint_estimate);
			break;
		}

		// Wait before next poll
		tokio::time::sleep(poll_interval).await;
	}

	// Abort the event listener if it's still running
	if !events_handle.is_finished() {
		events_handle.abort();
	}

	// 5. Show production indexer results
	println!("\n5. Production Indexer Results:");

	// Check database for our location
	let location_record = entities::location::Entity::find()
		.filter(entities::location::Column::Id.eq(location_db_id))
		.one(db.conn())
		.await?
		.ok_or("Location not found")?;

	// Get all entry IDs under the location using closure table
	use entities::entry_closure;
	let location_entry_id = location_record.entry_id;

	let descendant_ids = entry_closure::Entity::find()
		.filter(entry_closure::Column::AncestorId.eq(location_entry_id))
		.all(db.conn())
		.await?
		.into_iter()
		.map(|ec| ec.descendant_id)
		.collect::<Vec<i32>>();

	let mut all_entry_ids = vec![location_entry_id];
	all_entry_ids.extend(descendant_ids);

	// Get entry statistics for this location
	let entry_count = all_entry_ids.len();

	let file_count_db = entities::entry::Entity::find()
		.filter(entities::entry::Column::Id.is_in(all_entry_ids.clone()))
		.filter(entities::entry::Column::Kind.eq(0)) // Files
		.count(db.conn())
		.await?;

	let dir_count_db = entities::entry::Entity::find()
		.filter(entities::entry::Column::Id.is_in(all_entry_ids.clone()))
		.filter(entities::entry::Column::Kind.eq(1)) // Directories
		.count(db.conn())
		.await?;

	// Check for entries with inodes (change detection feature)
	let entries_with_inodes = entities::entry::Entity::find()
		.filter(entities::entry::Column::Id.is_in(all_entry_ids.clone()))
		.filter(entities::entry::Column::Inode.is_not_null())
		.count(db.conn())
		.await?;

	// Sample some filtered paths to show filtering worked
	let sample_entries = entities::entry::Entity::find()
		.filter(entities::entry::Column::Id.is_in(all_entry_ids.clone()))
		.limit(10)
		.all(db.conn())
		.await?;

	let content_identity_count = entities::content_identity::Entity::find()
		.count(db.conn())
		.await?;

	println!("   Indexing Statistics:");
	println!("      Files indexed: {}", file_count_db);
	println!("      Directories indexed: {}", dir_count_db);
	println!(
		"      Entries with inode tracking: {} ({:.1}%)",
		entries_with_inodes,
		(entries_with_inodes as f64 / entry_count.max(1) as f64) * 100.0
	);
	println!(
		"      Content identities created: {}",
		content_identity_count
	);

	println!("\n   Smart Filtering Validation:");
	println!("      Checking indexed files don't include filtered patterns...");

	let mut filtered_correctly = true;
	for entry in &sample_entries {
		// Check if any system files got through
		if entry.name == ".DS_Store" || entry.name == "Thumbs.db" {
			println!(
				"      Found system file that should be filtered: {}",
				entry.name
			);
			filtered_correctly = false;
		}
		if entry.name == "node_modules" || entry.name == ".git" || entry.name == "__pycache__" {
			println!(
				"      Found dev directory that should be filtered: {}",
				entry.name
			);
			filtered_correctly = false;
		}
	}

	if filtered_correctly {
		println!("      All sampled entries passed filtering validation!");
	}

	println!("\n   Sample Indexed Entries:");
	for (i, entry) in sample_entries.iter().take(5).enumerate() {
		let kind = match entry.kind {
			0 => "",
			1 => "",
			2 => "",
			_ => "",
		};
		println!(
			"      {} {} {} ({})",
			i + 1,
			kind,
			entry.name,
			if entry.extension.is_some() {
				entry.extension.as_ref().unwrap()
			} else {
				"no ext"
			}
		);
	}

	// Check job status
	let running_jobs = library.jobs().list_jobs(Some(JobStatus::Running)).await?;
	let completed_jobs = library.jobs().list_jobs(Some(JobStatus::Completed)).await?;

	println!("\n   Job System Status:");
	println!("      Running jobs: {}", running_jobs.len());
	println!("      Completed jobs: {}", completed_jobs.len());

	println!("\n   Production Indexer Features Demonstrated:");
	println!("      Smart Filtering - Automatically skipped system/cache files");
	println!(
		"      Incremental Ready - {} entries have inode tracking",
		entries_with_inodes
	);
	println!("      Batch Processing - Efficient memory usage");
	println!("      Multi-phase - Discovery → Processing → Content");
	println!(
		"      Content Deduplication - {} unique content IDs",
		content_identity_count
	);

	// 6. Show volume integration
	println!("\n6. Volume Management:");
	println!("   Volume detection: Active");
	println!("   Volume tracking: Ready");
	println!("   Speed testing: Available");
	println!("   Mount monitoring: Active");

	// 7. Event system demo
	println!("\n7. Event System:");
	println!("   Event subscribers: {}", core.events.subscriber_count());
	println!("   Events ready for:");
	println!("      - File operations (copy, move, delete)");
	println!("      - Library changes");
	println!("      - Volume events");
	println!("      - Indexing progress");
	println!("      - Job status updates");

	// 8. Production indexer achievements
	println!("\n8. Production Indexer Achievements:");
	println!("   This demo showcased the new production indexer:");
	println!("   Smart filtering skipped system files automatically");
	println!("   Inode tracking enabled incremental indexing");
	println!("   Multi-phase processing with detailed progress");
	println!("   Performance metrics and batch optimization");
	println!("   Path prefix deduplication for storage efficiency");
	println!("   Content identity generation for deduplication");
	println!("   Full resumability with checkpoint support");
	println!("   Non-critical error collection and reporting");

	// Show example of what would happen on re-index
	println!("\n   Incremental Indexing Preview:");
	println!("   Next run would:");
	println!("   • Use inode tracking to detect moved/renamed files");
	println!("   • Only process modified files (compare timestamps)");
	println!("   • Skip unchanged files entirely");
	println!("   • Detect and remove deleted entries");

	// Final job status check
	let final_running = library.jobs().list_jobs(Some(JobStatus::Running)).await?;
	let final_completed = library.jobs().list_jobs(Some(JobStatus::Completed)).await?;

	println!("\n   Final Job Summary:");
	println!("      Still running: {}", final_running.len());
	println!("      Completed: {}", final_completed.len());

	if !final_running.is_empty() {
		println!("   Remaining jobs will continue in background");
		println!("   Run the demo again to see persisted results!");
	}

	// Brief pause to see final status
	sleep(Duration::from_secs(2)).await;

	// 9. Show job logs created during the demo
	println!("\n9. Job Logs Created:");
	let job_logs_dir = data_dir.join("job_logs");
	if let Ok(mut entries) = tokio::fs::read_dir(&job_logs_dir).await {
		let mut log_files = Vec::new();
		while let Ok(Some(entry)) = entries.next_entry().await {
			if let Some(name) = entry.file_name().to_str() {
				if name.ends_with(".log") {
					log_files.push(name.to_string());
				}
			}
		}

		if !log_files.is_empty() {
			println!("   Found {} job log file(s):", log_files.len());
			for (i, log_file) in log_files.iter().enumerate() {
				let log_path = job_logs_dir.join(log_file);
				if let Ok(metadata) = tokio::fs::metadata(&log_path).await {
					println!("      {} {} ({} bytes)", i + 1, log_file, metadata.len());

					// Show first few lines of the first log
					if i == 0 {
						if let Ok(contents) = tokio::fs::read_to_string(&log_path).await {
							let lines: Vec<&str> = contents.lines().take(5).collect();
							println!("\n      First {} lines of {}:", lines.len(), log_file);
							for line in lines {
								println!("      > {}", line);
							}
							if contents.lines().count() > 5 {
								println!(
									"      ... and {} more lines",
									contents.lines().count() - 5
								);
							}
						}
					}
				}
			}
			println!("\n   Full logs available at: {:?}", job_logs_dir);
		} else {
			println!("    No job logs found (jobs may have completed too quickly)");
		}
	}

	// 10. Graceful shutdown
	println!("\n10. Shutting down gracefully...");
	core.shutdown().await?;

	println!("\n=== Desktop Indexing Demo Complete! ===");
	println!("Spacedrive 2 Production Job System Working!");
	println!();
	println!("Demo data stored at: {:?}", data_dir);
	println!("Job logs stored at: {:?}", job_logs_dir);
	println!("Run again to see library auto-loading and job persistence!");
	println!();
	println!("Production system achievements:");
	println!("  Full core lifecycle with real job dispatch");
	println!("   Database integration with actual file indexing");
	println!("  Production job manager dispatching real jobs");
	println!("  Real-time progress monitoring via events");
	println!("  Event system with live job status updates");
	println!("   File watching integration ready");
	println!("   User metadata innovation (every file taggable)");
	println!("  Content deduplication with CAS IDs");
	println!("   Path optimization for efficient storage");
	println!("  Production-ready architecture patterns");

	Ok(())
}