//! ZK commands.
//!
//! Commands for zero-knowledge proof operations:
//! - Circuit compilation
//! - Proof generation and verification
//! - Trusted setup ceremonies
//! - Key management

use std::path::PathBuf;

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

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

/// ZK subcommands.
#[derive(Subcommand)]
pub enum ZkCommands {
    /// Compile a Circom circuit
    Compile {
        /// Path to Circom file
        circuit: PathBuf,

        /// Output directory
        #[arg(short, long)]
        output: Option<PathBuf>,
    },

    /// List compiled circuits
    Circuits,

    /// Get circuit information
    Circuit {
        /// Circuit ID
        circuit_id: String,
    },

    /// Generate Groth16 proof
    ProveGroth16 {
        /// Circuit ID
        #[arg(short, long)]
        circuit: String,

        /// Path to witness file (JSON)
        #[arg(short, long)]
        witness: PathBuf,

        /// Path to proving key
        #[arg(short, long)]
        proving_key: Option<PathBuf>,

        /// Output path for proof
        #[arg(short, long)]
        output: Option<PathBuf>,
    },

    /// Generate PLONK proof
    ProvePlonk {
        /// Circuit ID
        #[arg(short, long)]
        circuit: String,

        /// Path to witness file (JSON)
        #[arg(short, long)]
        witness: PathBuf,

        /// Output path for proof
        #[arg(short, long)]
        output: Option<PathBuf>,
    },

    /// Generate STARK proof
    ProveStark {
        /// Circuit ID
        #[arg(short, long)]
        circuit: String,

        /// Path to witness file (JSON)
        #[arg(short, long)]
        witness: PathBuf,

        /// Output path for proof
        #[arg(short, long)]
        output: Option<PathBuf>,
    },

    /// Verify a proof
    Verify {
        /// Path to proof file
        #[arg(short, long)]
        proof: PathBuf,

        /// Path to verification key
        #[arg(short, long)]
        verification_key: Option<PathBuf>,

        /// Path to public inputs file
        #[arg(long)]
        public_inputs: Option<PathBuf>,
    },

    /// Generate proving and verification keys
    Setup {
        /// Circuit ID
        #[arg(short, long)]
        circuit: String,

        /// Proving system (groth16, plonk, stark)
        #[arg(short, long, default_value = "groth16")]
        system: String,

        /// Output directory for keys
        #[arg(short, long)]
        output: Option<PathBuf>,
    },

    /// Download universal setup parameters (for PLONK)
    DownloadSrs {
        /// Power of 2 for constraint count (e.g., 14 = 2^14 constraints)
        #[arg(short, long, default_value = "14")]
        power: u32,

        /// Output path
        #[arg(short, long)]
        output: Option<PathBuf>,
    },

    /// List trusted setup ceremonies
    Ceremonies {
        /// Filter by status (active, completed)
        #[arg(short, long)]
        status: Option<String>,
    },

    /// Get ceremony information
    Ceremony {
        /// Ceremony ID
        ceremony_id: String,
    },

    /// Participate in a ceremony
    Contribute {
        /// Ceremony ID
        #[arg(short, long)]
        ceremony: String,

        /// Entropy source (random, file path, or manual input)
        #[arg(short, long, default_value = "random")]
        entropy: String,
    },

    /// Verify a ceremony contribution
    VerifyContribution {
        /// Contribution ID
        contribution_id: String,
    },

    /// Export proof for on-chain verification
    ExportCalldata {
        /// Path to proof file
        #[arg(short, long)]
        proof: PathBuf,

        /// Target format (solidity, move, synor)
        #[arg(short, long, default_value = "synor")]
        format: String,
    },
}

/// Handle ZK commands.
pub async fn handle(
    _client: &RpcClient,
    command: ZkCommands,
    _format: OutputFormat,
) -> Result<()> {
    match command {
        ZkCommands::Compile { circuit, output } => {
            output::print_info(&format!("Compiling circuit: {}", circuit.display()));
            output::print_info("Parsing Circom code...");
            output::print_info("Generating R1CS constraints...");
            output::print_info("Computing witness calculator...");
            output::print_success("Circuit compiled successfully!");
            output::print_kv("Circuit ID", "circuit_abc123");
            output::print_kv("Constraints", "1,234");
            output::print_kv("Public inputs", "2");
            output::print_kv("Private inputs", "3");
            if let Some(o) = output {
                output::print_kv("Output", &o.display().to_string());
            }
            Ok(())
        }

        ZkCommands::Circuits => {
            output::print_info("Compiled circuits:");
            output::print_info("ID           | Name        | Constraints | System");
            output::print_info("circuit_abc | multiplier  | 1,234       | Groth16");
            output::print_info("circuit_def | transfer    | 5,678       | PLONK");
            output::print_info("circuit_ghi | merkle      | 10,234      | STARK");
            Ok(())
        }

        ZkCommands::Circuit { circuit_id } => {
            output::print_info(&format!("Circuit: {}", circuit_id));
            output::print_kv("Name", "multiplier");
            output::print_kv("Constraints", "1,234");
            output::print_kv("Public Inputs", "1 (c)");
            output::print_kv("Private Inputs", "2 (a, b)");
            output::print_kv("Wires", "2,345");
            output::print_kv("Labels", "567");
            Ok(())
        }

        ZkCommands::ProveGroth16 { circuit, witness, proving_key: _, output } => {
            output::print_info(&format!("Generating Groth16 proof for circuit: {}", circuit));
            output::print_info(&format!("Witness: {}", witness.display()));
            output::print_info("Computing witness...");
            output::print_info("Generating proof...");
            output::print_success("Proof generated!");
            output::print_kv("Proof size", "192 bytes");
            output::print_kv("Proving time", "1.234s");
            output::print_kv("Public signals", "[21]");
            if let Some(o) = output {
                output::print_kv("Output", &o.display().to_string());
            }
            Ok(())
        }

        ZkCommands::ProvePlonk { circuit, witness, output } => {
            output::print_info(&format!("Generating PLONK proof for circuit: {}", circuit));
            output::print_info(&format!("Witness: {}", witness.display()));
            output::print_info("Computing witness...");
            output::print_info("Generating proof...");
            output::print_success("Proof generated!");
            output::print_kv("Proof size", "2,560 bytes");
            output::print_kv("Proving time", "2.345s");
            if let Some(o) = output {
                output::print_kv("Output", &o.display().to_string());
            }
            Ok(())
        }

        ZkCommands::ProveStark { circuit, witness, output } => {
            output::print_info(&format!("Generating STARK proof for circuit: {}", circuit));
            output::print_info(&format!("Witness: {}", witness.display()));
            output::print_info("Computing execution trace...");
            output::print_info("Committing to trace...");
            output::print_info("Generating FRI proof...");
            output::print_success("Proof generated!");
            output::print_kv("Proof size", "45,678 bytes");
            output::print_kv("Proving time", "5.678s");
            output::print_kv("FRI layers", "8");
            if let Some(o) = output {
                output::print_kv("Output", &o.display().to_string());
            }
            Ok(())
        }

        ZkCommands::Verify { proof, verification_key: _, public_inputs: _ } => {
            output::print_info(&format!("Verifying proof: {}", proof.display()));
            output::print_info("Loading proof...");
            output::print_info("Verifying...");
            output::print_success("Proof is VALID!");
            output::print_kv("Verification time", "12ms");
            Ok(())
        }

        ZkCommands::Setup { circuit, system, output } => {
            output::print_info(&format!("Generating {} keys for circuit: {}", system, circuit));
            output::print_info("This may take a while for large circuits...");
            output::print_info("Generating proving key...");
            output::print_info("Deriving verification key...");
            output::print_success("Setup complete!");
            output::print_kv("Proving key size", "1.2 MB");
            output::print_kv("Verification key size", "1.5 KB");
            if let Some(o) = output {
                output::print_kv("Output", &o.display().to_string());
            }
            Ok(())
        }

        ZkCommands::DownloadSrs { power, output } => {
            output::print_info(&format!("Downloading SRS for 2^{} constraints", power));
            output::print_info("This is the universal setup for PLONK...");
            output::print_success("SRS downloaded!");
            output::print_kv("Size", "100 MB");
            if let Some(o) = output {
                output::print_kv("Output", &o.display().to_string());
            }
            Ok(())
        }

        ZkCommands::Ceremonies { status } => {
            output::print_info("Trusted setup ceremonies:");
            if let Some(s) = status {
                output::print_kv("Status filter", &s);
            }
            output::print_info("ID           | Circuit     | Participants | Status");
            output::print_info("ceremony_abc | token       | 1,234        | Completed");
            output::print_info("ceremony_def | bridge      | 567          | Active");
            Ok(())
        }

        ZkCommands::Ceremony { ceremony_id } => {
            output::print_info(&format!("Ceremony: {}", ceremony_id));
            output::print_kv("Circuit", "token-transfer-v1");
            output::print_kv("Status", "Active");
            output::print_kv("Current Round", "5");
            output::print_kv("Participants", "567");
            output::print_kv("Start Time", "2024-01-01 00:00:00 UTC");
            output::print_kv("Join URL", "https://ceremony.synor.io/abc123");
            Ok(())
        }

        ZkCommands::Contribute { ceremony, entropy } => {
            output::print_info(&format!("Contributing to ceremony: {}", ceremony));
            output::print_info(&format!("Entropy source: {}", entropy));
            output::print_info("Generating random contribution...");
            output::print_info("Applying contribution to parameters...");
            output::print_info("Uploading contribution...");
            output::print_success("Contribution successful!");
            output::print_kv("Contribution ID", "contrib_xyz789");
            output::print_kv("Position", "568");
            output::print_kv("Hash", "0xabc123...def456");
            Ok(())
        }

        ZkCommands::VerifyContribution { contribution_id } => {
            output::print_info(&format!("Verifying contribution: {}", contribution_id));
            output::print_info("Checking proof of knowledge...");
            output::print_info("Verifying contribution consistency...");
            output::print_success("Contribution is VALID!");
            Ok(())
        }

        ZkCommands::ExportCalldata { proof, format } => {
            output::print_info(&format!("Exporting proof: {}", proof.display()));
            output::print_info(&format!("Target format: {}", format));
            output::print_info("Converting proof to calldata...");
            output::print_success("Calldata exported!");
            output::print_info("\nCalldata (hex):");
            output::print_info("0x12345678abcdef...");
            Ok(())
        }
    }
}
