use anyhow::{Context, Result};
use chrono::Utc;
use clap::Parser;
use image_api::ai::ollama::OllamaClient;
use image_api::database::calendar_dao::{InsertCalendarEvent, SqliteCalendarEventDao};
use image_api::parsers::ical_parser::parse_ics_file;
use log::{error, info};
use std::sync::{Arc, Mutex};

// Import the trait to use its methods
use image_api::database::CalendarEventDao;

#[derive(Parser, Debug)]
#[command(author, version, about = "Import Google Takeout Calendar data", long_about = None)]
struct Args {
    /// Path to the .ics calendar file
    #[arg(short, long)]
    path: String,

    /// Generate embeddings for calendar events (slower but enables semantic search)
    #[arg(long, default_value = "false")]
    generate_embeddings: bool,

    /// Skip events that already exist in the database
    #[arg(long, default_value = "true")]
    skip_existing: bool,

    /// Batch size for embedding generation
    #[arg(long, default_value = "128")]
    batch_size: usize,
}

#[tokio::main]
async fn main() -> Result<()> {
    dotenv::dotenv().ok();
    env_logger::init();

    let args = Args::parse();

    info!("Parsing calendar file: {}", args.path);
    let events = parse_ics_file(&args.path).context("Failed to parse .ics file")?;

    info!("Found {} calendar events", events.len());

    let context = opentelemetry::Context::current();

    let ollama = if args.generate_embeddings {
        let primary_url = dotenv::var("OLLAMA_PRIMARY_URL")
            .or_else(|_| dotenv::var("OLLAMA_URL"))
            .unwrap_or_else(|_| "http://localhost:11434".to_string());
        let fallback_url = dotenv::var("OLLAMA_FALLBACK_URL").ok();
        let primary_model = dotenv::var("OLLAMA_PRIMARY_MODEL")
            .or_else(|_| dotenv::var("OLLAMA_MODEL"))
            .unwrap_or_else(|_| "nomic-embed-text:v1.5".to_string());
        let fallback_model = dotenv::var("OLLAMA_FALLBACK_MODEL").ok();

        Some(OllamaClient::new(
            primary_url,
            fallback_url,
            primary_model,
            fallback_model,
        ))
    } else {
        None
    };

    let inserted_count = Arc::new(Mutex::new(0));
    let skipped_count = Arc::new(Mutex::new(0));
    let error_count = Arc::new(Mutex::new(0));

    // Process events in batches
    // Can't use rayon with async, so process sequentially
    for event in &events {
        let mut dao_instance = SqliteCalendarEventDao::new();

        // Check if event exists
        if args.skip_existing
            && let Ok(exists) = dao_instance.event_exists(
                &context,
                event.event_uid.as_deref().unwrap_or(""),
                event.start_time,
            )
            && exists
        {
            *skipped_count.lock().unwrap() += 1;
            continue;
        }

        // Generate embedding if requested (blocking call)
        let embedding = if let Some(ref ollama_client) = ollama {
            let text = format!(
                "{} {} {}",
                event.summary,
                event.description.as_deref().unwrap_or(""),
                event.location.as_deref().unwrap_or("")
            );

            match tokio::task::block_in_place(|| {
                tokio::runtime::Handle::current()
                    .block_on(async { ollama_client.generate_embedding(&text).await })
            }) {
                Ok(emb) => Some(emb),
                Err(e) => {
                    error!(
                        "Failed to generate embedding for event '{}': {}",
                        event.summary, e
                    );
                    None
                }
            }
        } else {
            None
        };

        // Insert into database
        let insert_event = InsertCalendarEvent {
            event_uid: event.event_uid.clone(),
            summary: event.summary.clone(),
            description: event.description.clone(),
            location: event.location.clone(),
            start_time: event.start_time,
            end_time: event.end_time,
            all_day: event.all_day,
            organizer: event.organizer.clone(),
            attendees: if event.attendees.is_empty() {
                None
            } else {
                Some(serde_json::to_string(&event.attendees).unwrap_or_default())
            },
            embedding,
            created_at: Utc::now().timestamp(),
            source_file: Some(args.path.clone()),
        };

        match dao_instance.store_event(&context, insert_event) {
            Ok(_) => {
                *inserted_count.lock().unwrap() += 1;
                if *inserted_count.lock().unwrap() % 100 == 0 {
                    info!("Imported {} events...", *inserted_count.lock().unwrap());
                }
            }
            Err(e) => {
                error!("Failed to store event '{}': {:?}", event.summary, e);
                *error_count.lock().unwrap() += 1;
            }
        }
    }

    let final_inserted = *inserted_count.lock().unwrap();
    let final_skipped = *skipped_count.lock().unwrap();
    let final_errors = *error_count.lock().unwrap();

    info!("\n=== Import Summary ===");
    info!("Total events found: {}", events.len());
    info!("Successfully inserted: {}", final_inserted);
    info!("Skipped (already exist): {}", final_skipped);
    info!("Errors: {}", final_errors);

    if args.generate_embeddings {
        info!("Embeddings were generated for semantic search");
    } else {
        info!("No embeddings generated (use --generate-embeddings to enable semantic search)");
    }

    Ok(())
}