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use anchor_lang::prelude::*;
use solana_program::{
    program::invoke_signed,
    program_memory::sol_memcmp,
    program_pack::{IsInitialized, Pack},
    pubkey::PUBKEY_BYTES,
};
use spl_associated_token_account::get_associated_token_address;

use crate::errors::CandyGuardError;

/// TokenBurnParams
pub struct TokenBurnParams<'a: 'b, 'b> {
    /// mint
    /// CHECK: account checked in CPI
    pub mint: AccountInfo<'a>,
    /// source
    /// CHECK: account checked in CPI
    pub source: AccountInfo<'a>,
    /// amount
    pub amount: u64,
    /// authority
    /// CHECK: account checked in CPI
    pub authority: AccountInfo<'a>,
    /// authority_signer_seeds
    pub authority_signer_seeds: Option<&'b [&'b [u8]]>,
    /// token_program
    /// CHECK: account checked in CPI
    pub token_program: AccountInfo<'a>,
}

///TokenTransferParams
pub struct TokenTransferParams<'a: 'b, 'b> {
    /// source
    /// CHECK: account checked in CPI
    pub source: AccountInfo<'a>,
    /// destination
    /// CHECK: account checked in CPI
    pub destination: AccountInfo<'a>,
    /// amount
    pub amount: u64,
    /// authority
    /// CHECK: account checked in CPI
    pub authority: AccountInfo<'a>,
    /// authority_signer_seeds
    pub authority_signer_seeds: &'b [&'b [u8]],
    /// token_program
    /// CHECK: account checked in CPI
    pub token_program: AccountInfo<'a>,
}

pub fn cmp_pubkeys(a: &Pubkey, b: &Pubkey) -> bool {
    sol_memcmp(a.as_ref(), b.as_ref(), PUBKEY_BYTES) == 0
}

pub fn assert_initialized<T: Pack + IsInitialized>(account_info: &AccountInfo) -> Result<T> {
    let account: T = T::unpack_unchecked(&account_info.data.borrow())?;
    if !account.is_initialized() {
        err!(CandyGuardError::Uninitialized)
    } else {
        Ok(account)
    }
}

pub fn assert_is_ata(
    ata: &AccountInfo,
    wallet: &Pubkey,
    mint: &Pubkey,
) -> core::result::Result<spl_token::state::Account, ProgramError> {
    assert_owned_by(ata, &spl_token::id())?;
    let ata_account: spl_token::state::Account = assert_initialized(ata)?;
    assert_keys_equal(&ata_account.owner, wallet)?;
    assert_keys_equal(&ata_account.mint, mint)?;
    assert_keys_equal(&get_associated_token_address(wallet, mint), ata.key)?;
    Ok(ata_account)
}

pub fn assert_is_token_account(
    ta: &AccountInfo,
    wallet: &Pubkey,
    mint: &Pubkey,
) -> core::result::Result<spl_token::state::Account, ProgramError> {
    assert_owned_by(ta, &spl_token::id())?;
    let token_account: spl_token::state::Account = assert_initialized(ta)?;
    assert_keys_equal(&token_account.owner, wallet)?;
    assert_keys_equal(&token_account.mint, mint)?;
    Ok(token_account)
}

pub fn assert_keys_equal(key1: &Pubkey, key2: &Pubkey) -> Result<()> {
    if !cmp_pubkeys(key1, key2) {
        err!(CandyGuardError::PublicKeyMismatch)
    } else {
        Ok(())
    }
}

pub fn assert_owned_by(account: &AccountInfo, owner: &Pubkey) -> Result<()> {
    if !cmp_pubkeys(account.owner, owner) {
        err!(CandyGuardError::IncorrectOwner)
    } else {
        Ok(())
    }
}

pub fn spl_token_burn(params: TokenBurnParams) -> Result<()> {
    let TokenBurnParams {
        mint,
        source,
        authority,
        token_program,
        amount,
        authority_signer_seeds,
    } = params;
    let mut seeds: Vec<&[&[u8]]> = vec![];
    if let Some(seed) = authority_signer_seeds {
        seeds.push(seed);
    }
    let result = invoke_signed(
        &spl_token::instruction::burn(
            token_program.key,
            source.key,
            mint.key,
            authority.key,
            &[],
            amount,
        )?,
        &[source, mint, authority, token_program],
        seeds.as_slice(),
    );
    result.map_err(|_| CandyGuardError::TokenBurnFailed.into())
}

pub fn spl_token_transfer(params: TokenTransferParams<'_, '_>) -> Result<()> {
    let TokenTransferParams {
        source,
        destination,
        authority,
        token_program,
        amount,
        authority_signer_seeds,
    } = params;

    let mut signer_seeds = vec![];
    if !authority_signer_seeds.is_empty() {
        signer_seeds.push(authority_signer_seeds)
    }

    let result = invoke_signed(
        &spl_token::instruction::transfer(
            token_program.key,
            source.key,
            destination.key,
            authority.key,
            &[],
            amount,
        )?,
        &[source, destination, authority, token_program],
        &signer_seeds,
    );

    result.map_err(|_| CandyGuardError::TokenTransferFailed.into())
}