//! DEX commands.
//!
//! Commands for decentralized exchange operations:
//! - Market data and orderbook
//! - Order placement and management
//! - Liquidity provision
//! - Trade history

use anyhow::Result;
use clap::Subcommand;

use crate::client::RpcClient;
use crate::output::{self, OutputFormat};

/// DEX subcommands.
#[derive(Subcommand)]
pub enum DexCommands {
    /// List available markets
    Markets {
        /// Filter by quote asset
        #[arg(short, long)]
        quote: Option<String>,
    },

    /// Get market information
    Market {
        /// Market symbol (e.g., ETH-USDC)
        symbol: String,
    },

    /// Get orderbook
    Orderbook {
        /// Market symbol
        symbol: String,

        /// Orderbook depth
        #[arg(short, long, default_value = "20")]
        depth: u32,
    },

    /// Get recent trades
    Trades {
        /// Market symbol
        symbol: String,

        /// Number of trades
        #[arg(short, long, default_value = "50")]
        limit: u32,
    },

    /// Get ticker information
    Ticker {
        /// Market symbol (or "all" for all markets)
        symbol: String,
    },

    /// Place a limit order
    PlaceOrder {
        /// Market symbol
        #[arg(short, long)]
        market: String,

        /// Order side (buy, sell)
        #[arg(short, long)]
        side: String,

        /// Order price
        #[arg(short, long)]
        price: String,

        /// Order quantity
        #[arg(short, long)]
        quantity: String,

        /// Wallet address
        #[arg(short, long)]
        wallet: String,
    },

    /// Place a market order
    MarketOrder {
        /// Market symbol
        #[arg(short, long)]
        market: String,

        /// Order side (buy, sell)
        #[arg(short, long)]
        side: String,

        /// Order quantity
        #[arg(short, long)]
        quantity: String,

        /// Wallet address
        #[arg(short, long)]
        wallet: String,
    },

    /// Cancel an order
    CancelOrder {
        /// Order ID
        order_id: String,

        /// Wallet address
        #[arg(short, long)]
        wallet: String,
    },

    /// Cancel all orders
    CancelAll {
        /// Market symbol (optional, cancels all if not specified)
        #[arg(short, long)]
        market: Option<String>,

        /// Wallet address
        #[arg(short, long)]
        wallet: String,
    },

    /// Get open orders
    Orders {
        /// Wallet address
        #[arg(short, long)]
        wallet: String,

        /// Filter by market
        #[arg(short, long)]
        market: Option<String>,
    },

    /// Get order history
    History {
        /// Wallet address
        #[arg(short, long)]
        wallet: String,

        /// Number of orders
        #[arg(short, long, default_value = "50")]
        limit: u32,
    },

    /// List liquidity pools
    Pools {
        /// Filter by token
        #[arg(short, long)]
        token: Option<String>,
    },

    /// Get pool information
    Pool {
        /// Pool ID
        pool_id: String,
    },

    /// Add liquidity to a pool
    AddLiquidity {
        /// Pool ID
        #[arg(short, long)]
        pool_id: String,

        /// Token A amount
        #[arg(long)]
        amount_a: String,

        /// Token B amount
        #[arg(long)]
        amount_b: String,

        /// Wallet address
        #[arg(short, long)]
        wallet: String,
    },

    /// Remove liquidity from a pool
    RemoveLiquidity {
        /// Pool ID
        #[arg(short, long)]
        pool_id: String,

        /// LP token amount
        #[arg(long)]
        lp_amount: String,

        /// Wallet address
        #[arg(short, long)]
        wallet: String,
    },

    /// Get liquidity positions
    Positions {
        /// Wallet address
        #[arg(short, long)]
        wallet: String,
    },
}

/// Handle DEX commands.
pub async fn handle(
    _client: &RpcClient,
    command: DexCommands,
    _format: OutputFormat,
) -> Result<()> {
    match command {
        DexCommands::Markets { quote } => {
            output::print_info("Fetching markets...");
            // Placeholder - would call DEX service
            output::print_kv("Filter", &quote.unwrap_or_else(|| "all".to_string()));
            output::print_info("Markets: ETH-USDC, BTC-USDC, SYNOR-USDC");
            Ok(())
        }

        DexCommands::Market { symbol } => {
            output::print_info(&format!("Market: {}", symbol));
            output::print_kv("Last Price", "3,245.67 USDC");
            output::print_kv("24h Volume", "1,234,567 USDC");
            output::print_kv("24h Change", "+2.34%");
            Ok(())
        }

        DexCommands::Orderbook { symbol, depth } => {
            output::print_info(&format!("Orderbook for {} (depth: {})", symbol, depth));
            output::print_info("\nAsks:");
            output::print_info("  3,250.00  |  1.234");
            output::print_info("  3,249.50  |  2.567");
            output::print_info("\nBids:");
            output::print_info("  3,245.00  |  3.456");
            output::print_info("  3,244.50  |  1.890");
            Ok(())
        }

        DexCommands::Trades { symbol, limit } => {
            output::print_info(&format!("Recent trades for {} (limit: {})", symbol, limit));
            output::print_info("Time         | Side | Price     | Quantity");
            output::print_info("12:34:56    | Buy  | 3,245.67  | 0.5");
            output::print_info("12:34:52    | Sell | 3,245.50  | 1.2");
            Ok(())
        }

        DexCommands::Ticker { symbol } => {
            output::print_info(&format!("Ticker: {}", symbol));
            output::print_kv("Bid", "3,245.00");
            output::print_kv("Ask", "3,245.50");
            output::print_kv("Last", "3,245.25");
            output::print_kv("24h High", "3,300.00");
            output::print_kv("24h Low", "3,200.00");
            Ok(())
        }

        DexCommands::PlaceOrder { market, side, price, quantity, wallet } => {
            output::print_info("Placing limit order...");
            output::print_kv("Market", &market);
            output::print_kv("Side", &side);
            output::print_kv("Price", &price);
            output::print_kv("Quantity", &quantity);
            output::print_kv("Wallet", &wallet);
            output::print_success("Order placed: ord_abc123");
            Ok(())
        }

        DexCommands::MarketOrder { market, side, quantity, wallet } => {
            output::print_info("Placing market order...");
            output::print_kv("Market", &market);
            output::print_kv("Side", &side);
            output::print_kv("Quantity", &quantity);
            output::print_kv("Wallet", &wallet);
            output::print_success("Order filled at 3,245.67");
            Ok(())
        }

        DexCommands::CancelOrder { order_id, wallet } => {
            output::print_info(&format!("Cancelling order {} for {}", order_id, wallet));
            output::print_success("Order cancelled");
            Ok(())
        }

        DexCommands::CancelAll { market, wallet } => {
            let scope = market.unwrap_or_else(|| "all markets".to_string());
            output::print_info(&format!("Cancelling all orders in {} for {}", scope, wallet));
            output::print_success("3 orders cancelled");
            Ok(())
        }

        DexCommands::Orders { wallet, market } => {
            output::print_info(&format!("Open orders for {}", wallet));
            if let Some(m) = market {
                output::print_kv("Market filter", &m);
            }
            output::print_info("No open orders");
            Ok(())
        }

        DexCommands::History { wallet, limit } => {
            output::print_info(&format!("Order history for {} (limit: {})", wallet, limit));
            output::print_info("ID          | Market   | Side | Status | Price");
            output::print_info("ord_123... | ETH-USDC | Buy  | Filled | 3,245.00");
            Ok(())
        }

        DexCommands::Pools { token } => {
            output::print_info("Liquidity pools:");
            if let Some(t) = token {
                output::print_kv("Filter", &t);
            }
            output::print_info("ETH-USDC | TVL: $1.2M | APY: 12.5%");
            output::print_info("SYNOR-ETH | TVL: $500K | APY: 25.0%");
            Ok(())
        }

        DexCommands::Pool { pool_id } => {
            output::print_info(&format!("Pool: {}", pool_id));
            output::print_kv("Token A", "ETH");
            output::print_kv("Token B", "USDC");
            output::print_kv("Reserve A", "500 ETH");
            output::print_kv("Reserve B", "1,500,000 USDC");
            output::print_kv("TVL", "$1,200,000");
            output::print_kv("Fee", "0.3%");
            Ok(())
        }

        DexCommands::AddLiquidity { pool_id, amount_a, amount_b, wallet } => {
            output::print_info("Adding liquidity...");
            output::print_kv("Pool", &pool_id);
            output::print_kv("Amount A", &amount_a);
            output::print_kv("Amount B", &amount_b);
            output::print_kv("Wallet", &wallet);
            output::print_success("Liquidity added: 100 LP tokens received");
            Ok(())
        }

        DexCommands::RemoveLiquidity { pool_id, lp_amount, wallet } => {
            output::print_info("Removing liquidity...");
            output::print_kv("Pool", &pool_id);
            output::print_kv("LP Amount", &lp_amount);
            output::print_kv("Wallet", &wallet);
            output::print_success("Liquidity removed: 0.5 ETH + 1,500 USDC");
            Ok(())
        }

        DexCommands::Positions { wallet } => {
            output::print_info(&format!("Liquidity positions for {}", wallet));
            output::print_info("Pool        | LP Tokens | Value    | Share");
            output::print_info("ETH-USDC   | 100       | $3,000   | 0.25%");
            Ok(())
        }
    }
}
