use crate::{H160, H256};
use ethrex_crypto::keccak::keccak_hash;
use ethrex_rlp::constants::RLP_NULL;
use std::{str::FromStr, sync::LazyLock};

/// SYSTEM_ADDRESS used for system contract calls and BAL filtering.
/// 0xfffffffffffffffffffffffffffffffffffffffe
pub const SYSTEM_ADDRESS: H160 = H160([
    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
    0xFF, 0xFF, 0xFF, 0xFE,
]);

// = Keccak256(RLP([])) as of EIP-3675
pub static DEFAULT_OMMERS_HASH: LazyLock<H256> = LazyLock::new(|| {
    H256::from_slice(
        &hex::decode("1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347")
            .expect("Failed to decode hex from string"),
    )
});

// = Sha256([])) as of EIP-7685
pub static DEFAULT_REQUESTS_HASH: LazyLock<H256> = LazyLock::new(|| {
    H256::from_slice(
        &hex::decode("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
            .expect("Failed to decode hex from string"),
    )
});

// = Root of empty Trie as of EIP-4895
pub static EMPTY_WITHDRAWALS_HASH: LazyLock<H256> = LazyLock::new(|| {
    H256::from_slice(
        &hex::decode("56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421")
            .expect("Failed to decode hex from string"),
    )
});

// Keccak256(""), represents the code hash for an account without code
pub static EMPTY_KECCAK_HASH: LazyLock<H256> = LazyLock::new(|| {
    H256::from_slice(
        &hex::decode("c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470")
            .expect("Failed to decode hex from string"),
    )
});

pub static EMPTY_TRIE_HASH: LazyLock<H256> = LazyLock::new(|| H256(keccak_hash([RLP_NULL])));

// Request related
pub static DEPOSIT_TOPIC: LazyLock<H256> = LazyLock::new(|| {
    H256::from_str("649bbc62d0e31342afea4e5cd82d4049e7e1ee912fc0889aa790803be39038c5")
        .expect("Failed to decode hex from string")
});

// = Keccak256(RLP([])) as of EIP-7928
pub static EMPTY_BLOCK_ACCESS_LIST_HASH: LazyLock<H256> = LazyLock::new(|| {
    H256::from_slice(
        &hex::decode("1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347")
            .expect("Failed to decode hex from string"),
    )
});

// === EIP-4844 constants ===

/// Gas consumption of a single data blob (== blob byte size).
pub const GAS_PER_BLOB: u32 = 1 << 17;

// Minimum base fee per blob
pub const MIN_BASE_FEE_PER_BLOB_GAS: u64 = 1;

// === EIP-7934 constants ===

pub const MAX_BLOCK_SIZE: u64 = 10_485_760;
pub const RLP_BLOCK_SIZE_SAFETY_MARGIN: u64 = 2_097_152;
pub const MAX_RLP_BLOCK_SIZE: u64 = MAX_BLOCK_SIZE - RLP_BLOCK_SIZE_SAFETY_MARGIN;
// Blob base cost defined in EIP-7918
pub const BLOB_BASE_COST: u64 = 8192;

// === EIP-7825 constants ===
// https://eips.ethereum.org/EIPS/eip-7825
pub const POST_OSAKA_GAS_LIMIT_CAP: u64 = 16777216;
pub const TX_MAX_GAS_LIMIT_AMSTERDAM: u64 = 1 << 24; // 16,777,216

// === EIP-7928 BAL size cap constants ===
/// GAS_BLOCK_ACCESS_LIST_ITEM = GAS_WARM_ACCESS (100) + TX_ACCESS_LIST_STORAGE_KEY_COST (1900)
pub const BAL_ITEM_COST: u64 = 2000;
