//! Instruction types

// use crate::error::Error;
#![allow(dead_code)]

use solana_program::{
    instruction::{AccountMeta, Instruction as SolInstruction},
    program_error::ProgramError,
    program_pack::{Pack, Sealed},
    pubkey::Pubkey,
    sysvar,
};

// use std::convert::TryInto;
use borsh::{BorshDeserialize, BorshSchema, BorshSerialize};

/// Maximum number of oracles
pub const MAX_ORACLES: usize = 12;

/// The amount paid of TOKEN paid to each oracle per submission, in lamports (10e-10 SOL)
pub const PAYMENT_AMOUNT: u64 = 10;

/// Instructions supported by the program
#[derive(Clone, Debug, BorshSerialize, BorshDeserialize, BorshSchema, PartialEq)]
pub enum Instruction {
    /// Initializes a new Aggregator
    ///
    /// Accounts expected by this instruction:
    ///
    /// 0. `[]` Rent sysvar
    /// 1. `[writable]` The aggregator.
    /// 2. `[signer]` The aggregator's authority.
    Initialize {
        /// The interval(seconds) of an oracle's each submission
        submit_interval: u32,
        /// min submission value
        min_submission_value: u64,
        /// max submission value
        max_submission_value: u64,
        /// submission decimals
        submission_decimals: u8,
        /// A short description of what is being reported
        description: [u8; 32],
    },

    /// Add an oracle
    ///
    /// Accounts expected by this instruction:
    /// 0. `[writable]` The oracle
    /// 1. `[]` The oracle owner
    /// 2. `[]` Clock sysvar
    /// 3. `[writable]` The aggregator
    /// 4. `[signer]` The aggregator owner
    AddOracle {
        /// Is usually  the oracle name
        description: [u8; 32],
    },

    /// Remove an oracle
    ///
    /// Accounts expected by this instruction:
    /// 0. `[writable]` The aggregator.
    /// 1. `[signer]` The aggregator onwer.
    RemoveOracle {
        /// the oracle pubkey
        pubkey: [u8; 32],
    },

    /// Called by oracles when they have witnessed a need to update
    ///
    /// Accounts expected by this instruction:
    /// 0. `[writable]` The aggregator(key).
    /// 1. `[]` Clock sysvar
    /// 2. `[writable]` The oracle key.
    /// 3. `[signer]` The oracle owner.
    Submit {
        /// the updated data that the oracle is submitting
        submission: u64,
    },

    /// Oracle withdraw token
    ///
    /// Accounts expected by this instruction:
    /// 0. `[writable]` The aggregator (key).
    /// 1. `[writable]` The faucet (which token transfer from)
    /// 2. `[writable]` The recevier (which token withdraw to)
    /// 3. `[]` SPL Token program id
    /// 4. `[]` The faucet owner
    /// 5. `[signer, writable]` The oracle's authority.
    Withdraw {
        /// withdraw amount
        amount: u64,
        /// program account nonced seed
        seed: [u8; 32],
    },
}

impl Sealed for Instruction {}
impl Pack for Instruction {
    const LEN: usize = 54;

    fn pack_into_slice(&self, dst: &mut [u8]) {
        let data = self.pack_into_vec();
        dst[..data.len()].copy_from_slice(&data);
    }

    fn unpack_from_slice(src: &[u8]) -> Result<Self, ProgramError> {
        let mut mut_src: &[u8] = src;
        Self::deserialize(&mut mut_src).map_err(|_| ProgramError::InvalidInstructionData)
    }
}

impl Instruction {
    fn pack_into_vec(&self) -> Vec<u8> {
        self.try_to_vec().expect("try_to_vec")
    }
}

/// Below is for test

/// Creates a `intialize` instruction.
pub fn initialize(
    program_id: &Pubkey,
    aggregator_pubkey: &Pubkey,
    aggregator_owner_pubkey: &Pubkey,
    submit_interval: u32,
    min_submission_value: u64,
    max_submission_value: u64,
    submission_decimals: u8,
    description: [u8; 32],
) -> SolInstruction {
    let accounts = vec![
        AccountMeta::new_readonly(sysvar::rent::id(), false),
        AccountMeta::new(*aggregator_pubkey, false),
        AccountMeta::new_readonly(*aggregator_owner_pubkey, true),
    ];

    SolInstruction {
        program_id: *program_id,
        accounts,
        data: Instruction::Initialize {
            submit_interval,
            min_submission_value,
            max_submission_value,
            submission_decimals,
            description,
        }
        .pack_into_vec(),
    }
}

/// Creates a `add_oracle` instruction
pub fn add_oracle(
    program_id: &Pubkey,
    oracle_pubkey: &Pubkey,
    oracle_owner_pubkey: &Pubkey,
    aggregator_pubkey: &Pubkey,
    aggregator_owner_pubkey: &Pubkey,
    description: [u8; 32],
) -> SolInstruction {
    let accounts = vec![
        AccountMeta::new(*oracle_pubkey, false),
        AccountMeta::new(*oracle_owner_pubkey, false),
        AccountMeta::new_readonly(sysvar::clock::id(), false),
        AccountMeta::new(*aggregator_pubkey, false),
        AccountMeta::new_readonly(*aggregator_owner_pubkey, true),
    ];

    SolInstruction {
        program_id: *program_id,
        accounts,
        data: Instruction::AddOracle { description }.pack_into_vec(),
    }
}

/// Creates a `remove_oracle` instruction
pub fn remove_oracle(
    program_id: &Pubkey,
    aggregator_pubkey: &Pubkey,
    aggregator_owner_pubkey: &Pubkey,
    pubkey: &Pubkey,
) -> SolInstruction {
    let accounts = vec![
        AccountMeta::new(*aggregator_pubkey, false),
        AccountMeta::new_readonly(*aggregator_owner_pubkey, true),
    ];

    SolInstruction {
        program_id: *program_id,
        accounts,
        data: Instruction::RemoveOracle {
            pubkey: pubkey.to_bytes(),
        }
        .pack_into_vec(),
    }
}

/// Creates a `submit` instruction
pub fn submit(
    program_id: &Pubkey,
    aggregator_pubkey: &Pubkey,
    oracle_pubkey: &Pubkey,
    oracle_owner_pubkey: &Pubkey,
    submission: u64,
) -> SolInstruction {
    let accounts = vec![
        AccountMeta::new(*aggregator_pubkey, false),
        AccountMeta::new_readonly(sysvar::clock::id(), false),
        AccountMeta::new(*oracle_pubkey, false),
        AccountMeta::new_readonly(*oracle_owner_pubkey, true),
    ];

    SolInstruction {
        program_id: *program_id,
        accounts,
        data: Instruction::Submit { submission }.pack_into_vec(),
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::borsh_utils;
    use anyhow::Result;
    use hex;

    #[test]
    fn test_get_packed_len() {
        assert_eq!(
            Instruction::get_packed_len(),
            borsh_utils::get_packed_len::<Instruction>()
        )
    }

    #[test]
    fn test_serialize_bytes() -> Result<()> {
        let test_instruction = Instruction::Initialize {
            submit_interval: 0x11221122,
            min_submission_value: 0xaabbaabbaabbaabb,
            max_submission_value: 0xccddccddccddccdd,
            submission_decimals: 6,
            description: [0xff; 32],
        };

        let bytes = test_instruction.try_to_vec()?;

        assert_eq!(
            "0022112211bbaabbaabbaabbaaddccddccddccddcc06ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
            hex::encode(bytes),
        );

        Ok(())
    }

    #[test]
    fn state_deserialize_invalid() -> Result<()> {
        assert_eq!(
            Instruction::unpack_from_slice(&hex::decode("0022112211bbaabbaabbaabbaaddccddccddccddcc06ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")?),
            Ok(Instruction::Initialize {
                submit_interval: 0x11221122,
                min_submission_value: 0xaabbaabbaabbaabb,
                max_submission_value: 0xccddccddccddccdd,
                submission_decimals: 6,
                description: [0xff; 32],
            }),
        );

        // assert_eq!(
        //     Instruction::unpack_from_slice(&[
        //         4,
        //         15, 39, 0, 0, 0, 0, 0, 0,
        //         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
        //     ]),
        //     Ok(Instruction::Withdraw {
        //         amount: 9999u64,
        //         seed: [1u8; 32],
        //     }),
        // );

        Ok(())
    }
}