use crate::{
    common::SolanaRpcClient,
    instruction::utils::bonk_types::{pool_state_decode, PoolState},
};
use anyhow::anyhow;
use solana_sdk::pubkey::Pubkey;

/// Constants used as seeds for deriving PDAs (Program Derived Addresses)
pub mod seeds {
    pub const POOL_SEED: &[u8] = b"pool";
    pub const POOL_VAULT_SEED: &[u8] = b"pool_vault";
}

/// Constants related to program accounts and authorities
pub mod accounts {
    use solana_sdk::{pubkey, pubkey::Pubkey};

    pub const AUTHORITY: Pubkey = pubkey!("WLHv2UAZm6z4KyaaELi5pjdbJh6RESMva1Rnn8pJVVh");
    pub const GLOBAL_CONFIG: Pubkey = pubkey!("6s1xP3hpbAfFoNtUNF8mfHsjr2Bd97JxFJRWLbL6aHuX");
    pub const USD1_GLOBAL_CONFIG: Pubkey = pubkey!("EPiZbnrThjyLnoQ6QQzkxeFqyL5uyg9RzNHHAudUPxBz");
    pub const EVENT_AUTHORITY: Pubkey = pubkey!("2DPAtwB8L12vrMRExbLuyGnC7n2J5LNoZQSejeQGpwkr");
    pub const BONK: Pubkey = pubkey!("LanMV9sAd7wArD4vJFi2qDdfnVhFxYSUg6eADduJ3uj");

    pub const PLATFORM_FEE_RATE: u128 = 100; // 1%
    pub const PROTOCOL_FEE_RATE: u128 = 25; // 0.25%
    pub const SHARE_FEE_RATE: u128 = 0; // 0%

    // META
    pub const AUTHORITY_META: solana_sdk::instruction::AccountMeta =
        solana_sdk::instruction::AccountMeta {
            pubkey: AUTHORITY,
            is_signer: false,
            is_writable: false,
        };
    pub const GLOBAL_CONFIG_META: solana_sdk::instruction::AccountMeta =
        solana_sdk::instruction::AccountMeta {
            pubkey: GLOBAL_CONFIG,
            is_signer: false,
            is_writable: false,
        };

    pub const USD1_GLOBAL_CONFIG_META: solana_sdk::instruction::AccountMeta =
        solana_sdk::instruction::AccountMeta {
            pubkey: USD1_GLOBAL_CONFIG,
            is_signer: false,
            is_writable: false,
        };

    pub const EVENT_AUTHORITY_META: solana_sdk::instruction::AccountMeta =
        solana_sdk::instruction::AccountMeta {
            pubkey: EVENT_AUTHORITY,
            is_signer: false,
            is_writable: false,
        };
    pub const BONK_META: solana_sdk::instruction::AccountMeta =
        solana_sdk::instruction::AccountMeta { pubkey: BONK, is_signer: false, is_writable: false };
}

pub const BUY_EXECT_IN_DISCRIMINATOR: [u8; 8] = [250, 234, 13, 123, 213, 156, 19, 236];
pub const BUY_EXECT_OUT_DISCRIMINATOR: [u8; 8] = [24, 211, 116, 40, 105, 3, 153, 56];
pub const SELL_EXECT_IN_DISCRIMINATOR: [u8; 8] = [149, 39, 222, 155, 211, 124, 152, 26];
pub const SELL_EXECT_OUT_DISCRIMINATOR: [u8; 8] = [95, 200, 71, 34, 8, 9, 11, 166];

pub async fn fetch_pool_state(
    rpc: &SolanaRpcClient,
    pool_address: &Pubkey,
) -> Result<PoolState, anyhow::Error> {
    let account = rpc.get_account(pool_address).await?;
    if account.owner != accounts::BONK {
        return Err(anyhow!("Account is not owned by Bonk program"));
    }
    let pool_state = pool_state_decode(&account.data[8..])
        .ok_or_else(|| anyhow!("Failed to decode pool state"))?;
    Ok(pool_state)
}

pub fn get_amount_in_net(
    amount_in: u64,
    protocol_fee_rate: u128,
    platform_fee_rate: u128,
    share_fee_rate: u128,
) -> u64 {
    let amount_in_u128 = amount_in as u128;
    let protocol_fee = (amount_in_u128 * protocol_fee_rate / 10000) as u128;
    let platform_fee = (amount_in_u128 * platform_fee_rate / 10000) as u128;
    let share_fee = (amount_in_u128 * share_fee_rate / 10000) as u128;
    amount_in_u128
        .checked_sub(protocol_fee)
        .unwrap()
        .checked_sub(platform_fee)
        .unwrap()
        .checked_sub(share_fee)
        .unwrap() as u64
}

pub fn get_amount_in(
    amount_out: u64,
    protocol_fee_rate: u128,
    platform_fee_rate: u128,
    share_fee_rate: u128,
    virtual_base: u128,
    virtual_quote: u128,
    real_base: u128,
    real_quote: u128,
    slippage_basis_points: u128,
) -> u64 {
    let amount_out_u128 = amount_out as u128;

    // Consider slippage, actual required output amount is higher
    let amount_out_with_slippage = amount_out_u128 * 10000 / (10000 - slippage_basis_points);

    let input_reserve = virtual_quote.checked_add(real_quote).unwrap();
    let output_reserve = virtual_base.checked_sub(real_base).unwrap();

    // Reverse calculate using AMM formula: amount_in_net = (amount_out * input_reserve) / (output_reserve - amount_out)
    let numerator = amount_out_with_slippage.checked_mul(input_reserve).unwrap();
    let denominator = output_reserve.checked_sub(amount_out_with_slippage).unwrap();
    let amount_in_net = numerator.checked_div(denominator).unwrap();

    // Calculate total fee rate
    let total_fee_rate = protocol_fee_rate + platform_fee_rate + share_fee_rate;

    let amount_in = amount_in_net * 10000 / (10000 - total_fee_rate);

    amount_in as u64
}

pub fn get_amount_out(
    amount_in: u64,
    protocol_fee_rate: u128,
    platform_fee_rate: u128,
    share_fee_rate: u128,
    virtual_base: u128,
    virtual_quote: u128,
    real_base: u128,
    real_quote: u128,
    slippage_basis_points: u128,
) -> u64 {
    let amount_in_u128 = amount_in as u128;
    let protocol_fee = (amount_in_u128 * protocol_fee_rate / 10000) as u128;
    let platform_fee = (amount_in_u128 * platform_fee_rate / 10000) as u128;
    let share_fee = (amount_in_u128 * share_fee_rate / 10000) as u128;
    let amount_in_net = amount_in_u128
        .checked_sub(protocol_fee)
        .unwrap()
        .checked_sub(platform_fee)
        .unwrap()
        .checked_sub(share_fee)
        .unwrap();
    let input_reserve = virtual_quote.checked_add(real_quote).unwrap();
    let output_reserve = virtual_base.checked_sub(real_base).unwrap();
    let numerator = amount_in_net.checked_mul(output_reserve).unwrap();
    let denominator = input_reserve.checked_add(amount_in_net).unwrap();
    let mut amount_out = numerator.checked_div(denominator).unwrap();

    amount_out = amount_out - (amount_out * slippage_basis_points) / 10000;
    amount_out as u64
}

pub fn get_pool_pda(base_mint: &Pubkey, quote_mint: &Pubkey) -> Option<Pubkey> {
    crate::common::fast_fn::get_cached_pda(
        crate::common::fast_fn::PdaCacheKey::BonkPool(*base_mint, *quote_mint),
        || {
            let seeds: &[&[u8]; 3] = &[seeds::POOL_SEED, base_mint.as_ref(), quote_mint.as_ref()];
            let program_id: &Pubkey = &accounts::BONK;
            let pda: Option<(Pubkey, u8)> = Pubkey::try_find_program_address(seeds, program_id);
            pda.map(|pubkey| pubkey.0)
        },
    )
}

pub fn get_vault_pda(pool_state: &Pubkey, mint: &Pubkey) -> Option<Pubkey> {
    crate::common::fast_fn::get_cached_pda(
        crate::common::fast_fn::PdaCacheKey::BonkVault(*pool_state, *mint),
        || {
            let seeds: &[&[u8]; 3] = &[seeds::POOL_VAULT_SEED, pool_state.as_ref(), mint.as_ref()];
            let program_id: &Pubkey = &accounts::BONK;
            let pda: Option<(Pubkey, u8)> = Pubkey::try_find_program_address(seeds, program_id);
            pda.map(|pubkey| pubkey.0)
        },
    )
}

pub fn get_platform_associated_account(platform_config: &Pubkey) -> Option<Pubkey> {
    let seeds: &[&[u8]; 2] =
        &[platform_config.as_ref(), crate::constants::WSOL_TOKEN_ACCOUNT.as_ref()];
    let program_id: &Pubkey = &accounts::BONK;
    let pda: Option<(Pubkey, u8)> = Pubkey::try_find_program_address(seeds, program_id);
    pda.map(|pubkey| pubkey.0)
}

pub fn get_creator_associated_account(creator: &Pubkey) -> Option<Pubkey> {
    let seeds: &[&[u8]; 2] = &[creator.as_ref(), crate::constants::WSOL_TOKEN_ACCOUNT.as_ref()];
    let program_id: &Pubkey = &accounts::BONK;
    let pda: Option<(Pubkey, u8)> = Pubkey::try_find_program_address(seeds, program_id);
    pda.map(|pubkey| pubkey.0)
}