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

use crate::types::{error::Error, TreasuryDiff};

use bee_common::packable::{Packable, Read, Write};
use bee_message::output::OutputId;

/// A type to record output and treasury changes that happened within a milestone.
#[derive(Debug, Eq, PartialEq)]
pub struct OutputDiff {
    created_outputs: Vec<OutputId>,
    consumed_outputs: Vec<OutputId>,
    treasury_diff: Option<TreasuryDiff>,
}

impl OutputDiff {
    /// Creates a new `OutputDiff`.
    pub fn new(
        created_outputs: Vec<OutputId>,
        consumed_outputs: Vec<OutputId>,
        treasury_diff: Option<TreasuryDiff>,
    ) -> Self {
        Self {
            created_outputs,
            consumed_outputs,
            treasury_diff,
        }
    }

    /// Returns the created outputs of the `OutputDiff`.
    pub fn created_outputs(&self) -> &[OutputId] {
        &self.created_outputs
    }

    /// Returns the consumed outputs of the `OutputDiff`.
    pub fn consumed_outputs(&self) -> &[OutputId] {
        &self.consumed_outputs
    }

    /// Returns the treasury diff of the `OutputDiff`.
    pub fn treasury_diff(&self) -> Option<&TreasuryDiff> {
        self.treasury_diff.as_ref()
    }
}

impl Packable for OutputDiff {
    type Error = Error;

    fn packed_len(&self) -> usize {
        self.created_outputs.packed_len() + self.consumed_outputs.packed_len() + self.treasury_diff.packed_len()
    }

    fn pack<W: Write>(&self, writer: &mut W) -> Result<(), Self::Error> {
        (self.created_outputs.len() as u32).pack(writer)?;
        for output in self.created_outputs.iter() {
            output.pack(writer)?;
        }

        (self.consumed_outputs.len() as u32).pack(writer)?;
        for output in self.consumed_outputs.iter() {
            output.pack(writer)?;
        }

        self.treasury_diff.pack(writer).map_err(|_| Error::PackableOption)?;

        Ok(())
    }

    fn unpack_inner<R: Read + ?Sized, const CHECK: bool>(reader: &mut R) -> Result<Self, Self::Error> {
        let created_outputs_len = u32::unpack_inner::<R, CHECK>(reader)? as usize;
        let mut created_outputs = Vec::with_capacity(created_outputs_len);
        for _ in 0..created_outputs_len {
            created_outputs.push(OutputId::unpack_inner::<R, CHECK>(reader)?);
        }

        let consumed_outputs_len = u32::unpack_inner::<R, CHECK>(reader)? as usize;
        let mut consumed_outputs = Vec::with_capacity(consumed_outputs_len);
        for _ in 0..consumed_outputs_len {
            consumed_outputs.push(OutputId::unpack_inner::<R, CHECK>(reader)?);
        }

        let treasury_diff =
            Option::<TreasuryDiff>::unpack_inner::<R, CHECK>(reader).map_err(|_| Error::PackableOption)?;

        Ok(Self {
            created_outputs,
            consumed_outputs,
            treasury_diff,
        })
    }
}