anya-core 1.2.0

use std::error::Error;
// src/bitcoin/taproot/script.rs

use std::collections::HashMap;
use bitcoin::{ScriptBuf, Witness};
use miniscript::{Miniscript, Descriptor};

use crate::common::error::AnyaResult;

/// Types of Taproot scripts
///
/// # Compliance
/// - BIP-341/342 (Taproot)
/// - Miniscript support (future)
/// - See @AI labelling.md
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum TaprootScriptType {
    /// Raw Bitcoin script
    Raw,
    
    /// Miniscript-based script (more structured)
    Miniscript,
    
    /// Time-locked script (CSV/CLTV)
    TimeLock {
        /// Block height or timestamp
        lock_value: u32,
        /// Whether this is a relative or absolute timelock
        is_relative: bool,
    },
    
    /// Multi-signature script
    MultiSig {
        /// Required signatures
        threshold: usize,
        /// Total participants
        total: usize,
    },
    
    /// Hash lock script (preimage needed to spend)
    HashLock {
        /// Hash type (SHA256, etc.)
        hash_type: String,
    },
    
    /// Point lock script (signature needed to spend)
    PointLock,
    
    /// Custom script with description
    Custom {
        /// Description of the script
        description: String,
    },
}

/// Represents a Taproot script for inclusion in a Taproot output
///
/// # Compliance
/// - BIP-341/342 (Taproot)
/// - RGB compatibility
/// - See @AI labelling.md
#[derive(Debug, Clone)]
pub struct TaprootScript {
    /// Script type
    pub script_type: TaprootScriptType,
    
    /// The actual Bitcoin script
    pub script: ScriptBuf,
    
    /// Script version (default: 0xc0 for Tapscript)
    pub version: u8,
    
    /// Script metadata
    pub metadata: HashMap<String, String>,
    
    /// If this is a Miniscript, the parsed representation
    pub miniscript: Option<String>,
}

impl TaprootScript {
    /// Creates a new Taproot script from a Bitcoin script
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn new(script: ScriptBuf, script_type: TaprootScriptType) -> Self {
        Self {
            script_type,
            script,
            version: 0xc0, // Tapscript version
            metadata: HashMap::new(),
            miniscript: None,
        }
    }
    
    /// Creates a new Taproot script from a Miniscript
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - Miniscript support (future)
    /// - See @AI labelling.md
    pub fn from_miniscript(miniscript_str: &str) -> AnyaResult<Self> {
        // Implementation goes here
        // Parse miniscript, convert to Script
        
        // Placeholder for now
        Ok(Self {
            script_type: TaprootScriptType::Miniscript,
            script: ScriptBuf::new(),
            version: 0xc0,
            metadata: HashMap::new(),
            miniscript: Some(miniscript_str.to_string()),
        })
    }
    
    /// Creates a multi-signature script
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn create_multisig(threshold: usize, public_keys: &[&str]) -> AnyaResult<Self> {
        // Implementation goes here
        // Create a threshold signature script
        
        // Placeholder for now
        Ok(Self {
            script_type: TaprootScriptType::MultiSig {
                threshold,
                total: public_keys.len(),
            },
            script: ScriptBuf::new(),
            version: 0xc0,
            metadata: HashMap::new(),
            miniscript: None,
        })
    }
    
    /// Creates a time-locked script
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn create_timelock(base_script: &TaprootScript, lock_value: u32, is_relative: bool) -> AnyaResult<Self> {
        // Implementation goes here
        // Create a timelock wrapper around base_script
        
        // Placeholder for now
        Ok(Self {
            script_type: TaprootScriptType::TimeLock {
                lock_value,
                is_relative,
            },
            script: ScriptBuf::new(),
            version: 0xc0,
            metadata: HashMap::new(),
            miniscript: None,
        })
    }
    
    /// Creates a hash lock script
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn create_hashlock(hash_hex: &str, hash_type: &str) -> AnyaResult<Self> {
        // Implementation goes here
        // Create a hash lock script
        
        // Placeholder for now
        Ok(Self {
            script_type: TaprootScriptType::HashLock {
                hash_type: hash_type.to_string(),
            },
            script: ScriptBuf::new(),
            version: 0xc0,
            metadata: HashMap::new(),
            miniscript: None,
        })
    }
    
    /// Adds metadata to the script
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn add_metadata(&mut self, key: &str, value: &str) {
        self.metadata.insert(key.to_string(), value.to_string());
    }
    
    /// Gets the leaf hash of this script
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn leaf_hash(&self) -> AnyaResult<Vec<u8>> {
        // Implementation goes here
        // Calculate TapLeafHash
        
        // Placeholder for now
        Ok(vec![])
    }
    
    /// Converts this script to a witness
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn to_witness(&self, control_block: Vec<u8>) -> Witness {
        // Implementation goes here
        // Create a witness for spending this script
        
        // Placeholder for now
        Witness::new()
    }
}

/// Builder for Taproot scripts
///
/// # Compliance
/// - BIP-341/342 (Taproot)
/// - Extensible for RGB/Miniscript
/// - See @AI labelling.md
///
/// # Architecture
/// - Use via adapter/port layer for hexagonal architecture
pub struct TaprootScriptBuilder {
    script_type: TaprootScriptType,
    version: u8,
    metadata: HashMap<String, String>,
    operations: Vec<String>,
}

impl TaprootScriptBuilder {
    /// Creates a new Taproot script builder
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn new(script_type: TaprootScriptType) -> Self {
        Self {
            script_type,
            version: 0xc0, // Tapscript version
            metadata: HashMap::new(),
            operations: Vec::new(),
        }
    }
    
    /// Sets the script version
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn with_version(mut self, version: u8) -> Self {
        self.version = version;
        self
    }
    
    /// Adds an operation to the script
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn add_op(mut self, op: &str) -> Self {
        self.operations.push(op.to_string());
        self
    }
    
    /// Adds metadata to the script
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn add_metadata(mut self, key: &str, value: &str) -> Self {
        self.metadata.insert(key.to_string(), value.to_string());
        self
    }
    
    /// Builds the Taproot script
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    ///
    /// # TODO
    /// - Implement full Miniscript and script conversion
    pub fn build(self) -> AnyaResult<TaprootScript> {
        // Implementation goes here
        // Convert operations to ScriptBuf
        
        // Placeholder for now
        Ok(TaprootScript {
            script_type: self.script_type,
            script: ScriptBuf::new(),
            version: self.version,
            metadata: self.metadata,
            miniscript: None,
        })
    }
}

/// Helper for parsing scripts
pub struct ScriptParser;

impl ScriptParser {
    /// Parses a Bitcoin script
    ///
    /// # Compliance
    /// - BIP-341/342 (Taproot)
    /// - See @AI labelling.md
    pub fn parse_script(script: &ScriptBuf) -> AnyaResult<TaprootScriptType>  -> Result<(), Box<dyn Error>> {
        // Implementation goes here
        // Detect script type from script
        
        // Placeholder for now
        Ok(TaprootScriptType::Raw)
    }
    
    /// Parses a Miniscript
    ///
    /// # Compliance
    /// - Miniscript support (future)
    /// - See @AI labelling.md
    pub fn parse_miniscript(miniscript_str: &str) -> AnyaResult<Miniscript<String>>  -> Result<(), Box<dyn Error>> {
        // Implementation goes here
        
        // Placeholder for now
        Err("Miniscript parsing not yet implemented".into())
    }
}