// Bitcoin Dev Kit
// Written in 2020 by Alekos Filini <alekos.filini@gmail.com>
//
// Copyright (c) 2020-2021 Bitcoin Dev Kit Developers
//
// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
// or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
// You may not use this file except in accordance with one or both of these
// licenses.

use std::fmt;

use crate::bitcoin::Network;
use crate::{descriptor, wallet};
use bitcoin::{OutPoint, Txid};

/// Errors that can be thrown by the [`Wallet`](crate::wallet::Wallet)
#[derive(Debug)]
pub enum Error {
    /// Wrong number of bytes found when trying to convert to u32
    InvalidU32Bytes(Vec<u8>),
    /// Generic error
    Generic(String),
    /// This error is thrown when trying to convert Bare and Public key script to address
    ScriptDoesntHaveAddressForm,
    /// Cannot build a tx without recipients
    NoRecipients,
    /// `manually_selected_only` option is selected but no utxo has been passed
    NoUtxosSelected,
    /// Output created is under the dust limit, 546 satoshis
    OutputBelowDustLimit(usize),
    /// Wallet's UTXO set is not enough to cover recipient's requested plus fee
    InsufficientFunds {
        /// Sats needed for some transaction
        needed: u64,
        /// Sats available for spending
        available: u64,
    },
    /// Branch and bound coin selection possible attempts with sufficiently big UTXO set could grow
    /// exponentially, thus a limit is set, and when hit, this error is thrown
    BnBTotalTriesExceeded,
    /// Branch and bound coin selection tries to avoid needing a change by finding the right inputs for
    /// the desired outputs plus fee, if there is not such combination this error is thrown
    BnBNoExactMatch,
    /// Happens when trying to spend an UTXO that is not in the internal database
    UnknownUtxo,
    /// Thrown when a tx is not found in the internal database
    TransactionNotFound,
    /// Happens when trying to bump a transaction that is already confirmed
    TransactionConfirmed,
    /// Trying to replace a tx that has a sequence >= `0xFFFFFFFE`
    IrreplaceableTransaction,
    /// When bumping a tx the fee rate requested is lower than required
    FeeRateTooLow {
        /// Required fee rate (satoshi/vbyte)
        required: crate::types::FeeRate,
    },
    /// When bumping a tx the absolute fee requested is lower than replaced tx absolute fee
    FeeTooLow {
        /// Required fee absolute value (satoshi)
        required: u64,
    },
    /// Node doesn't have data to estimate a fee rate
    FeeRateUnavailable,
    /// In order to use the [`TxBuilder::add_global_xpubs`] option every extended
    /// key in the descriptor must either be a master key itself (having depth = 0) or have an
    /// explicit origin provided
    ///
    /// [`TxBuilder::add_global_xpubs`]: crate::wallet::tx_builder::TxBuilder::add_global_xpubs
    MissingKeyOrigin(String),
    /// Error while working with [`keys`](crate::keys)
    Key(crate::keys::KeyError),
    /// Descriptor checksum mismatch
    ChecksumMismatch,
    /// Spending policy is not compatible with this [`KeychainKind`](crate::types::KeychainKind)
    SpendingPolicyRequired(crate::types::KeychainKind),
    /// Error while extracting and manipulating policies
    InvalidPolicyPathError(crate::descriptor::policy::PolicyError),
    /// Signing error
    Signer(crate::wallet::signer::SignerError),
    /// Invalid network
    InvalidNetwork {
        /// requested network, for example what is given as bdk-cli option
        requested: Network,
        /// found network, for example the network of the bitcoin node
        found: Network,
    },
    #[cfg(feature = "verify")]
    /// Transaction verification error
    Verification(crate::wallet::verify::VerifyError),

    /// Progress value must be between `0.0` (included) and `100.0` (included)
    InvalidProgressValue(f32),
    /// Progress update error (maybe the channel has been closed)
    ProgressUpdateError,
    /// Requested outpoint doesn't exist in the tx (vout greater than available outputs)
    InvalidOutpoint(OutPoint),

    /// Error related to the parsing and usage of descriptors
    Descriptor(crate::descriptor::error::Error),
    /// Encoding error
    Encode(bitcoin::consensus::encode::Error),
    /// Miniscript error
    Miniscript(miniscript::Error),
    /// Miniscript PSBT error
    MiniscriptPsbt(MiniscriptPsbtError),
    /// BIP32 error
    Bip32(bitcoin::util::bip32::Error),
    /// A secp256k1 error
    Secp256k1(bitcoin::secp256k1::Error),
    /// Error serializing or deserializing JSON data
    Json(serde_json::Error),
    /// Hex decoding error
    Hex(bitcoin::hashes::hex::Error),
    /// Partially signed bitcoin transaction error
    Psbt(bitcoin::util::psbt::Error),
    /// Partially signed bitcoin transaction parse error
    PsbtParse(bitcoin::util::psbt::PsbtParseError),

    //KeyMismatch(bitcoin::secp256k1::PublicKey, bitcoin::secp256k1::PublicKey),
    //MissingInputUTXO(usize),
    //InvalidAddressNetwork(Address),
    //DifferentTransactions,
    //DifferentDescriptorStructure,
    //Uncapable(crate::blockchain::Capability),
    //MissingCachedAddresses,
    /// [`crate::blockchain::WalletSync`] sync attempt failed due to missing scripts in cache which
    /// are needed to satisfy `stop_gap`.
    MissingCachedScripts(MissingCachedScripts),

    #[cfg(feature = "electrum")]
    /// Electrum client error
    Electrum(electrum_client::Error),
    #[cfg(feature = "esplora")]
    /// Esplora client error
    Esplora(Box<crate::blockchain::esplora::EsploraError>),
    #[cfg(feature = "compact_filters")]
    /// Compact filters client error)
    CompactFilters(crate::blockchain::compact_filters::CompactFiltersError),
    #[cfg(feature = "key-value-db")]
    /// Sled database error
    Sled(sled::Error),
    #[cfg(feature = "rpc")]
    /// Rpc client error
    Rpc(bitcoincore_rpc::Error),
    #[cfg(feature = "sqlite")]
    /// Rusqlite client error
    Rusqlite(rusqlite::Error),
}

/// Errors returned by miniscript when updating inconsistent PSBTs
#[derive(Debug, Clone)]
pub enum MiniscriptPsbtError {
    Conversion(miniscript::descriptor::ConversionError),
    UtxoUpdate(miniscript::psbt::UtxoUpdateError),
    OutputUpdate(miniscript::psbt::OutputUpdateError),
}

impl fmt::Display for MiniscriptPsbtError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Conversion(err) => write!(f, "Conversion error: {}", err),
            Self::UtxoUpdate(err) => write!(f, "UTXO update error: {}", err),
            Self::OutputUpdate(err) => write!(f, "Output update error: {}", err),
        }
    }
}

impl std::error::Error for MiniscriptPsbtError {}

/// Represents the last failed [`crate::blockchain::WalletSync`] sync attempt in which we were short
/// on cached `scriptPubKey`s.
#[derive(Debug)]
pub struct MissingCachedScripts {
    /// Number of scripts in which txs were requested during last request.
    pub last_count: usize,
    /// Minimum number of scripts to cache more of in order to satisfy `stop_gap`.
    pub missing_count: usize,
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::InvalidU32Bytes(_) => write!(
                f,
                "Wrong number of bytes found when trying to convert to u32"
            ),
            Self::Generic(err) => write!(f, "Generic error: {}", err),
            Self::ScriptDoesntHaveAddressForm => write!(f, "Script doesn't have address form"),
            Self::NoRecipients => write!(f, "Cannot build tx without recipients"),
            Self::NoUtxosSelected => write!(f, "No UTXO selected"),
            Self::OutputBelowDustLimit(limit) => {
                write!(f, "Output below the dust limit: {}", limit)
            }
            Self::InsufficientFunds { needed, available } => write!(
                f,
                "Insufficient funds: {} sat available of {} sat needed",
                available, needed
            ),
            Self::BnBTotalTriesExceeded => {
                write!(f, "Branch and bound coin selection: total tries exceeded")
            }
            Self::BnBNoExactMatch => write!(f, "Branch and bound coin selection: not exact match"),
            Self::UnknownUtxo => write!(f, "UTXO not found in the internal database"),
            Self::TransactionNotFound => {
                write!(f, "Transaction not found in the internal database")
            }
            Self::TransactionConfirmed => write!(f, "Transaction already confirmed"),
            Self::IrreplaceableTransaction => write!(f, "Transaction can't be replaced"),
            Self::FeeRateTooLow { required } => write!(
                f,
                "Fee rate too low: required {} sat/vbyte",
                required.as_sat_per_vb()
            ),
            Self::FeeTooLow { required } => write!(f, "Fee to low: required {} sat", required),
            Self::FeeRateUnavailable => write!(f, "Fee rate unavailable"),
            Self::MissingKeyOrigin(err) => write!(f, "Missing key origin: {}", err),
            Self::Key(err) => write!(f, "Key error: {}", err),
            Self::ChecksumMismatch => write!(f, "Descriptor checksum mismatch"),
            Self::SpendingPolicyRequired(keychain_kind) => {
                write!(f, "Spending policy required: {:?}", keychain_kind)
            }
            Self::InvalidPolicyPathError(err) => write!(f, "Invalid policy path: {}", err),
            Self::Signer(err) => write!(f, "Signer error: {}", err),
            Self::InvalidNetwork { requested, found } => write!(
                f,
                "Invalid network: requested {} but found {}",
                requested, found
            ),
            #[cfg(feature = "verify")]
            Self::Verification(err) => write!(f, "Transaction verification error: {}", err),
            Self::InvalidProgressValue(progress) => {
                write!(f, "Invalid progress value: {}", progress)
            }
            Self::ProgressUpdateError => write!(
                f,
                "Progress update error (maybe the channel has been closed)"
            ),
            Self::InvalidOutpoint(outpoint) => write!(
                f,
                "Requested outpoint doesn't exist in the tx: {}",
                outpoint
            ),
            Self::Descriptor(err) => write!(f, "Descriptor error: {}", err),
            Self::Encode(err) => write!(f, "Encoding error: {}", err),
            Self::Miniscript(err) => write!(f, "Miniscript error: {}", err),
            Self::MiniscriptPsbt(err) => write!(f, "Miniscript PSBT error: {}", err),
            Self::Bip32(err) => write!(f, "BIP32 error: {}", err),
            Self::Secp256k1(err) => write!(f, "Secp256k1 error: {}", err),
            Self::Json(err) => write!(f, "Serialize/Deserialize JSON error: {}", err),
            Self::Hex(err) => write!(f, "Hex decoding error: {}", err),
            Self::Psbt(err) => write!(f, "PSBT error: {}", err),
            Self::PsbtParse(err) => write!(f, "Impossible to parse PSBT: {}", err),
            Self::MissingCachedScripts(missing_cached_scripts) => {
                write!(f, "Missing cached scripts: {:?}", missing_cached_scripts)
            }
            #[cfg(feature = "electrum")]
            Self::Electrum(err) => write!(f, "Electrum client error: {}", err),
            #[cfg(feature = "esplora")]
            Self::Esplora(err) => write!(f, "Esplora client error: {}", err),
            #[cfg(feature = "compact_filters")]
            Self::CompactFilters(err) => write!(f, "Compact filters client error: {}", err),
            #[cfg(feature = "key-value-db")]
            Self::Sled(err) => write!(f, "Sled database error: {}", err),
            #[cfg(feature = "rpc")]
            Self::Rpc(err) => write!(f, "RPC client error: {}", err),
            #[cfg(feature = "sqlite")]
            Self::Rusqlite(err) => write!(f, "SQLite error: {}", err),
        }
    }
}

impl std::error::Error for Error {}

macro_rules! impl_error {
    ( $from:ty, $to:ident ) => {
        impl_error!($from, $to, Error);
    };
    ( $from:ty, $to:ident, $impl_for:ty ) => {
        impl std::convert::From<$from> for $impl_for {
            fn from(err: $from) -> Self {
                <$impl_for>::$to(err)
            }
        }
    };
}

impl_error!(descriptor::error::Error, Descriptor);
impl_error!(descriptor::policy::PolicyError, InvalidPolicyPathError);
impl_error!(wallet::signer::SignerError, Signer);

impl From<crate::keys::KeyError> for Error {
    fn from(key_error: crate::keys::KeyError) -> Error {
        match key_error {
            crate::keys::KeyError::Miniscript(inner) => Error::Miniscript(inner),
            crate::keys::KeyError::Bip32(inner) => Error::Bip32(inner),
            crate::keys::KeyError::InvalidChecksum => Error::ChecksumMismatch,
            e => Error::Key(e),
        }
    }
}

impl_error!(bitcoin::consensus::encode::Error, Encode);
impl_error!(miniscript::Error, Miniscript);
impl_error!(MiniscriptPsbtError, MiniscriptPsbt);
impl_error!(bitcoin::util::bip32::Error, Bip32);
impl_error!(bitcoin::secp256k1::Error, Secp256k1);
impl_error!(serde_json::Error, Json);
impl_error!(bitcoin::hashes::hex::Error, Hex);
impl_error!(bitcoin::util::psbt::Error, Psbt);
impl_error!(bitcoin::util::psbt::PsbtParseError, PsbtParse);

#[cfg(feature = "electrum")]
impl_error!(electrum_client::Error, Electrum);
#[cfg(feature = "key-value-db")]
impl_error!(sled::Error, Sled);
#[cfg(feature = "rpc")]
impl_error!(bitcoincore_rpc::Error, Rpc);
#[cfg(feature = "sqlite")]
impl_error!(rusqlite::Error, Rusqlite);

#[cfg(feature = "compact_filters")]
impl From<crate::blockchain::compact_filters::CompactFiltersError> for Error {
    fn from(other: crate::blockchain::compact_filters::CompactFiltersError) -> Self {
        match other {
            crate::blockchain::compact_filters::CompactFiltersError::Global(e) => *e,
            err => Error::CompactFilters(err),
        }
    }
}

#[cfg(feature = "verify")]
impl From<crate::wallet::verify::VerifyError> for Error {
    fn from(other: crate::wallet::verify::VerifyError) -> Self {
        match other {
            crate::wallet::verify::VerifyError::Global(inner) => *inner,
            err => Error::Verification(err),
        }
    }
}

#[cfg(feature = "esplora")]
impl From<crate::blockchain::esplora::EsploraError> for Error {
    fn from(other: crate::blockchain::esplora::EsploraError) -> Self {
        Error::Esplora(Box::new(other))
    }
}