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use {
    anchor_lang::{
        prelude::borsh::BorshSchema, prelude::*, solana_program::instruction::Instruction,
        AnchorDeserialize,
    },
    std::{convert::TryFrom, hash::Hash},
};

/// The data needed execute an instruction on Solana.
#[derive(AnchorDeserialize, AnchorSerialize, BorshSchema, Clone, Debug, Hash, PartialEq)]
pub struct InstructionData {
    /// Pubkey of the instruction processor that executes this instruction
    pub program_id: Pubkey,
    /// Metadata for what accounts should be passed to the instruction processor
    pub accounts: Vec<AccountMetaData>,
    /// Opaque data passed to the instruction processor
    pub data: Vec<u8>,
}

impl From<Instruction> for InstructionData {
    fn from(instruction: Instruction) -> Self {
        InstructionData {
            program_id: instruction.program_id,
            accounts: instruction
                .accounts
                .iter()
                .map(|a| AccountMetaData {
                    pubkey: a.pubkey,
                    is_signer: a.is_signer,
                    is_writable: a.is_writable,
                })
                .collect(),
            data: instruction.data,
        }
    }
}

impl From<&InstructionData> for Instruction {
    fn from(instruction: &InstructionData) -> Self {
        Instruction {
            program_id: instruction.program_id,
            accounts: instruction
                .accounts
                .iter()
                .map(|a| AccountMeta {
                    pubkey: a.pubkey,
                    is_signer: a.is_signer,
                    is_writable: a.is_writable,
                })
                .collect(),
            data: instruction.data.clone(),
        }
    }
}

impl TryFrom<Vec<u8>> for InstructionData {
    type Error = Error;
    fn try_from(data: Vec<u8>) -> std::result::Result<Self, Self::Error> {
        Ok(
            borsh::try_from_slice_with_schema::<InstructionData>(data.as_slice())
                .map_err(|_err| ErrorCode::AccountDidNotDeserialize)?,
        )
    }
}

/// Account metadata needed to execute an instruction on Solana.
#[derive(AnchorDeserialize, AnchorSerialize, BorshSchema, Clone, Debug, Hash, PartialEq)]
pub struct AccountMetaData {
    /// An account's public key
    pub pubkey: Pubkey,
    /// True if an Instruction requires a Transaction signature matching `pubkey`.
    pub is_signer: bool,
    /// True if the `pubkey` can be loaded as a read-write account.
    pub is_writable: bool,
}