const TX_OVERHEAD_NVERSION = 4;
const TX_OVERHEAD_INPUT_COUNT = 1;
const TX_OVERHEAD_OUTPUT_COUNT = 1;
const TX_OVERHEAD_NLOCKTIME = 4;
const TX_INPUT_OUTPOINT = 36;
// scriptPubKey length (compactSize) The length of the scriptPubKey field. 1 vbyte for a script up to 252 vbytes. Maximum of 3 vbytes for a maximum-length script (10,000 vbytes).
const TX_INPUT_SCRIPTSIGLENGTH = 1;
const TX_INPUT_NSEQUENCE = 4;
const TX_OUTPUT_NVALUE = 8;
// scriptPubKey length (compactSize) The length of the scriptPubKey field. 1 vbyte for a script up to 252 vbytes. Maximum of 3 vbytes for a maximum-length script (10,000 vbytes).
const TX_OUTPUT_SCRIPTPUBKEYLENGTH = 1;

export const GLOBAL_VARS = {
    TX_OVERHEAD_BASE: TX_OVERHEAD_NVERSION + TX_OVERHEAD_INPUT_COUNT + TX_OVERHEAD_OUTPUT_COUNT + TX_OVERHEAD_NLOCKTIME,
    TX_OVERHEAD_NVERSION: TX_OVERHEAD_NVERSION,
    TX_OVERHEAD_INPUT_COUNT: TX_OVERHEAD_INPUT_COUNT,

    TX_INPUT_BASE: TX_INPUT_OUTPOINT + TX_INPUT_SCRIPTSIGLENGTH + TX_INPUT_NSEQUENCE,
    TX_INPUT_OUTPOINT: TX_INPUT_OUTPOINT,
    TX_INPUT_SCRIPTSIGLENGTH: TX_INPUT_SCRIPTSIGLENGTH,
    TX_INPUT_NSEQUENCE: TX_INPUT_NSEQUENCE,

    TX_OVERHEAD_OUTPUT_COUNT: TX_OVERHEAD_OUTPUT_COUNT,

    // ecdsa_signature (72) (about half of all signatures generated with a random nonce are this size, about half are one byte smaller, and a small percentage are smaller than that)
    TX_INPUT_SCRIPTSIG_P2PK: 73,
    TX_INPUT_SCRIPTSIG_P2PKH: 107,
    TX_INPUT_SCRIPTSIG_P2SH2OF3: 254,

    TX_OUTPUT_BASE: TX_OUTPUT_NVALUE + TX_OUTPUT_SCRIPTPUBKEYLENGTH,
    TX_OUTPUT_NVALUE: TX_OUTPUT_NVALUE,
    TX_OUTPUT_SCRIPTPUBKEYLENGTH: TX_OUTPUT_SCRIPTPUBKEYLENGTH,

    TX_OVERHEAD_NLOCKTIME: TX_OVERHEAD_NLOCKTIME,

    // Output scripts
    // OP_DUP OP_HASH160 OP_PUSH20 <public_key_hash> OP_EQUALVERIFY OP_CHECKSIG
    TX_OUTPUT_SCRIPTPUBKEY_P2PKH: 25,
    // OP_0 OP_PUSH20 <public_key_hash>
    TX_OUTPUT_SCRIPTPUBKEY_P2WPKH: 22,
    // OP_HASH160 OP_PUSH20 <script_hash> OP_EQUAL
    TX_OUTPUT_SCRIPTPUBKEY_P2SH2OF3: 23,
    // OP_0 OP_PUSH32 <script_hash>
    TX_OUTPUT_SCRIPTPUBKEY_P2WSH2OF3: 34,
    // OP_1 OP_PUSH32 <schnorr_public_key>
    TX_OUTPUT_SCRIPTPUBKEY_P2TR: 34,

    HASH_TYPE: 0x01,
    MAX_FEE_RATE: 0.4,
    AVG_FEE_RATE: 0.002,
    // transaction types
    CONTRACT_CALL: 1,
    CONTRACT_CREATION: 2,
    P2PKH: 3,
    DEPLOY_ERROR: 4,
    // vsize witness scale
    WITNESS_SCALE_FACTOR: 4,
    UTXO_VINDEX: 0
  }