use anyhow::Result;
use brewlog::application::{ServerConfig, serve};
use brewlog::infrastructure::backup::BackupData;
use brewlog::infrastructure::client::BrewlogClient;
use brewlog::presentation::cli::{
    Cli, Commands, ServeCommand, bags, brews, cafes, cups, gear, roasters, roasts, tokens,
};
use clap::Parser;
use tracing::{Subscriber, subscriber::set_global_default};
use tracing_bunyan_formatter::{BunyanFormattingLayer, JsonStorageLayer};
use tracing_log::LogTracer;
use tracing_subscriber::fmt::MakeWriter;
use tracing_subscriber::{EnvFilter, Registry, layer::SubscriberExt};

#[tokio::main]
async fn main() -> Result<()> {
    // Load .env file if present (before clap parses env vars)
    let _ = dotenvy::dotenv();

    let subscriber = get_subscriber("brewlog".into(), "info".into(), std::io::stdout);
    init_subscriber(subscriber);

    let cli = Cli::parse();

    match cli.command {
        Commands::Serve(cmd) => run_server(cmd).await,
        Commands::Roaster { command } => {
            let client = BrewlogClient::from_base_url(&cli.api_url)?;
            roasters::run(&client, command).await
        }
        Commands::Roast { command } => {
            let client = BrewlogClient::from_base_url(&cli.api_url)?;
            roasts::run(&client, command).await
        }
        Commands::Bag { command } => {
            let client = BrewlogClient::from_base_url(&cli.api_url)?;
            bags::run(&client, command).await
        }
        Commands::Gear { command } => {
            let client = BrewlogClient::from_base_url(&cli.api_url)?;
            gear::run(&client, command).await
        }
        Commands::Brew { command } => {
            let client = BrewlogClient::from_base_url(&cli.api_url)?;
            brews::run(&client, command).await
        }
        Commands::Cafe { command } => {
            let client = BrewlogClient::from_base_url(&cli.api_url)?;
            cafes::run(&client, command).await
        }
        Commands::Cup { command } => {
            let client = BrewlogClient::from_base_url(&cli.api_url)?;
            cups::run(&client, command).await
        }
        Commands::Token { command } => {
            let client = BrewlogClient::from_base_url(&cli.api_url)?;
            tokens::run(&client, command).await
        }
        Commands::Backup(_cmd) => {
            let client = BrewlogClient::from_base_url(&cli.api_url)?;
            let data = client.backup().export().await?;
            let json = serde_json::to_string_pretty(&data)?;
            println!("{json}");
            Ok(())
        }
        Commands::Restore(cmd) => {
            let contents = std::fs::read_to_string(&cmd.file)?;
            let data: BackupData = serde_json::from_str(&contents)?;
            let client = BrewlogClient::from_base_url(&cli.api_url)?;
            client.backup().restore(&data).await?;
            eprintln!("Restore complete.");
            Ok(())
        }
    }
}

async fn run_server(command: ServeCommand) -> Result<()> {
    let rp_id = command.rp_id.ok_or_else(|| {
        anyhow::anyhow!(
            "BREWLOG_RP_ID is required. Set this to the domain where the app is hosted \
             (e.g. 'brewlog.example.com' or 'localhost')."
        )
    })?;

    let rp_origin = command.rp_origin.ok_or_else(|| {
        anyhow::anyhow!(
            "BREWLOG_RP_ORIGIN is required. Set this to the full origin URL \
             (e.g. 'https://brewlog.example.com' or 'http://localhost:3000')."
        )
    })?;

    let openrouter_api_key = command.openrouter_api_key.ok_or_else(|| {
        anyhow::anyhow!(
            "BREWLOG_OPENROUTER_API_KEY is required. Set this environment variable \
             to your OpenRouter API key for AI-powered extraction features."
        )
    })?;

    let foursquare_api_key = command.foursquare_api_key.ok_or_else(|| {
        anyhow::anyhow!(
            "BREWLOG_FOURSQUARE_API_KEY is required. Set this environment variable \
             to your Foursquare API key for nearby cafe search."
        )
    })?;

    let config = ServerConfig {
        bind_address: command.bind_address,
        database_url: command.database_url,
        rp_id,
        rp_origin,
        openrouter_api_key,
        openrouter_model: command.openrouter_model,
        foursquare_api_key,
    };

    serve(config).await
}

pub fn get_subscriber<Sink>(
    name: String,
    env_filter: String,
    sink: Sink,
) -> impl Subscriber + Send + Sync
where
    Sink: for<'a> MakeWriter<'a> + Send + Sync + 'static,
{
    let env_filter =
        EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(env_filter));
    let formatting_layer = BunyanFormattingLayer::new(name, sink);

    Registry::default()
        .with(env_filter)
        .with(JsonStorageLayer)
        .with(formatting_layer)
}

/// Register a subscriber as global default to process span data.
///
/// This should only be called once!
#[allow(clippy::expect_used)] // Startup: panicking is appropriate if logging cannot be initialized
pub fn init_subscriber(subscriber: impl Subscriber + Send + Sync) {
    LogTracer::init().expect("Failed to set logger");
    set_global_default(subscriber).expect("Failed to set subscriber");
}