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// Copyright 2020-2021 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

mod output_id;
mod signature_locked_dust_allowance;
mod signature_locked_single;
mod treasury;

use bee_common::packable::{Packable, Read, Write};

pub use self::{
    output_id::{OutputId, OUTPUT_ID_LENGTH},
    signature_locked_dust_allowance::{
        dust_outputs_max, SignatureLockedDustAllowanceOutput, DUST_ALLOWANCE_DIVISOR, DUST_OUTPUTS_MAX, DUST_THRESHOLD,
        SIGNATURE_LOCKED_DUST_ALLOWANCE_OUTPUT_AMOUNT,
    },
    signature_locked_single::{SignatureLockedSingleOutput, SIGNATURE_LOCKED_SINGLE_OUTPUT_AMOUNT},
    treasury::{TreasuryOutput, TREASURY_OUTPUT_AMOUNT},
};
use crate::Error;

/// A generic output that can represent different types defining the deposit of funds.
#[derive(Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
#[cfg_attr(
    feature = "serde",
    derive(serde::Serialize, serde::Deserialize),
    serde(tag = "type", content = "data")
)]
pub enum Output {
    /// A signature locked single output.
    SignatureLockedSingle(SignatureLockedSingleOutput),
    /// A signature locked dust allowance output.
    SignatureLockedDustAllowance(SignatureLockedDustAllowanceOutput),
    /// A treasury output.
    Treasury(TreasuryOutput),
}

impl Output {
    /// Return the output kind of an `Output`.
    pub fn kind(&self) -> u8 {
        match self {
            Self::SignatureLockedSingle(_) => SignatureLockedSingleOutput::KIND,
            Self::SignatureLockedDustAllowance(_) => SignatureLockedDustAllowanceOutput::KIND,
            Self::Treasury(_) => TreasuryOutput::KIND,
        }
    }
}

impl From<SignatureLockedSingleOutput> for Output {
    fn from(output: SignatureLockedSingleOutput) -> Self {
        Self::SignatureLockedSingle(output)
    }
}

impl From<SignatureLockedDustAllowanceOutput> for Output {
    fn from(output: SignatureLockedDustAllowanceOutput) -> Self {
        Self::SignatureLockedDustAllowance(output)
    }
}

impl From<TreasuryOutput> for Output {
    fn from(output: TreasuryOutput) -> Self {
        Self::Treasury(output)
    }
}

impl Packable for Output {
    type Error = Error;

    fn packed_len(&self) -> usize {
        match self {
            Self::SignatureLockedSingle(output) => SignatureLockedSingleOutput::KIND.packed_len() + output.packed_len(),
            Self::SignatureLockedDustAllowance(output) => {
                SignatureLockedDustAllowanceOutput::KIND.packed_len() + output.packed_len()
            }
            Self::Treasury(output) => TreasuryOutput::KIND.packed_len() + output.packed_len(),
        }
    }

    fn pack<W: Write>(&self, writer: &mut W) -> Result<(), Self::Error> {
        match self {
            Self::SignatureLockedSingle(output) => {
                SignatureLockedSingleOutput::KIND.pack(writer)?;
                output.pack(writer)?;
            }
            Self::SignatureLockedDustAllowance(output) => {
                SignatureLockedDustAllowanceOutput::KIND.pack(writer)?;
                output.pack(writer)?;
            }
            Self::Treasury(output) => {
                TreasuryOutput::KIND.pack(writer)?;
                output.pack(writer)?;
            }
        }

        Ok(())
    }

    fn unpack_inner<R: Read + ?Sized, const CHECK: bool>(reader: &mut R) -> Result<Self, Self::Error> {
        Ok(match u8::unpack_inner::<R, CHECK>(reader)? {
            SignatureLockedSingleOutput::KIND => SignatureLockedSingleOutput::unpack_inner::<R, CHECK>(reader)?.into(),
            SignatureLockedDustAllowanceOutput::KIND => {
                SignatureLockedDustAllowanceOutput::unpack_inner::<R, CHECK>(reader)?.into()
            }
            TreasuryOutput::KIND => TreasuryOutput::unpack_inner::<R, CHECK>(reader)?.into(),
            k => return Err(Self::Error::InvalidOutputKind(k)),
        })
    }
}