use redstone_rust_sdk;
use std::convert::TryInto;
use std::{fmt::Write, num::ParseIntError};

const REDSTONE_PAYLOAD_HEX_STR: &str = "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";
const BTC_BYTES_32_HEX_STR: &str =
  "4254430000000000000000000000000000000000000000000000000000000000";
const SIGNER_1_PUB_KEY: &str = "034f355bdcb7cc0af728ef3cceb9615d90684bb5b2ca5f859ab0f0b704075871aa";
const SIGNER_2_PUB_KEY: &str = "02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27";

// ========================== RedStone payload structure (hex) ==========================
//   "4254430000000000000000000000000000000000000000000000000000000000" + // bytes32("BTC")
//   "000000000000000000000000000000000000000000000000000003d1e3821000" + // 42000 * 10^8
//   "4554480000000000000000000000000000000000000000000000000000000000" + // bytes32("ETH")
//   "0000000000000000000000000000000000000000000000000000002e90edd000" + // 2000 * 10^8
//   "01812f2590c0" + // timestamp (1654353400000 in hex)
//   "00000020" + // data points value byte size (32 in hex)
//   "000002" + // data points count
//   "c1296a449f5d353c8b04eb389f33a583ee79449cca6e366900042f19f2521e722a410929223231905839c00865af68738f1a202478d87dc33675ea5824f343901b" + // signature of the first signer
//   "4254430000000000000000000000000000000000000000000000000000000000" + // bytes32("BTC")
//   "000000000000000000000000000000000000000000000000000003d1e3821000" + // 42000 * 10^8
//   "4554480000000000000000000000000000000000000000000000000000000000" + // bytes32("ETH")
//   "0000000000000000000000000000000000000000000000000000002e90edd000" + // 2000 * 10^8
//   "01812f2590c0" + // timestamp (1654353400000 in hex)
//   "00000020" + // data points value byte size (32 in hex)
//   "000002" + // data points count
//   "dbbf8a0e6b1c9a56a4a0ef7089ef2a3f74fbd21fbd5c7c8192b70084004b4f6d37427507c4fff835f74fd4d000b6830ed296e207f49831b96f90a4f4e60820ee1c" + // signature of the second signer
//   "0002" + // data packages count
//   "312e312e3223746573742d646174612d66656564" + // unsigned metadata toUtf8Bytes("1.1.2#test-data-feed")
//   "000014" + // unsigned metadata byte size (20 in hex)
//   "000002ed57011e0000" // RedStone marker

pub fn decode_hex(s: &str) -> Result<Vec<u8>, ParseIntError> {
  (0..s.len())
    .step_by(2)
    .map(|i| u8::from_str_radix(&s[i..i + 2], 16))
    .collect()
}

pub fn encode_hex(bytes: &[u8]) -> String {
  let mut s = String::with_capacity(bytes.len() * 2);
  for &b in bytes {
    write!(&mut s, "{:02x}", b).unwrap();
  }
  s
}

fn get_pub_key(hex_pub_key: &str) -> [u8; 33] {
  let pub_key_vec = decode_hex(hex_pub_key).unwrap();
  pub_key_vec.try_into().unwrap()
}

#[test]
fn it_gets_oracle_value() {
  let redstone_payload_vec = decode_hex(REDSTONE_PAYLOAD_HEX_STR).unwrap();
  let data_feed_id_vec = decode_hex(BTC_BYTES_32_HEX_STR).unwrap();
  let data_feed_id: [u8; 32] = data_feed_id_vec.try_into().unwrap();
  let authorised_signers: Vec<[u8; 33]> =
    vec![get_pub_key(SIGNER_1_PUB_KEY), get_pub_key(SIGNER_2_PUB_KEY)];
  let unique_signers_threshold = 1;
  let current_timestamp_milliseconds = 1654353400000;
  let oracle_value = redstone_rust_sdk::get_oracle_value(
    &data_feed_id,
    unique_signers_threshold,
    &authorised_signers,
    current_timestamp_milliseconds,
    &redstone_payload_vec,
  );
  assert_eq!(42_000 * 100_000_000, oracle_value);
}