#!/usr/bin/env bash
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
SKILL_ROOT="$(dirname "$SCRIPT_DIR")"
source "$SCRIPT_DIR/_common.sh"

: "${BTC_NETWORK:=testnet}"
: "${BTC_FEE_RATE:=5}"
: "${OP_RETURN_PREFIX:=VM}"
: "${LABEL:=btc-anchor}"

main() {
  confirm_gate
  flag="$(net_flag)"
  mkdir -p "$SKILL_ROOT/outputs/runs"
  ts="$(date -Iseconds | tr ':' '-')"
  run_dir="$SKILL_ROOT/outputs/runs/${LABEL}_${ts}"
  mkdir -p "$run_dir"

  root_hex="$(read_root_hex)"
  echo "$root_hex" > "$run_dir/root_hex.txt"
  prefix_hex="$(ascii_to_hex "$OP_RETURN_PREFIX")"
  payload="${prefix_hex}${root_hex}"
  payload="${payload:0:160}"
  echo "$payload" > "$run_dir/op_return_hex.txt"

  # 1) create raw tx with single OP_RETURN output (no inputs yet)
  raw="$(bitcoin-cli $flag createrawtransaction "[]" "{\"data\":\"$payload\"}")"
  # 2) fund via PSBT
  funded="$(bitcoin-cli $flag walletcreatefundedpsbt "[]" "{\"data\":\"$payload\"}" 0 "{\"fee_rate\":$BTC_FEE_RATE}")"
  psbt="$(echo "$funded" | jq -r '.psbt')"
  [[ -n "$psbt" && "$psbt" != "null" ]] || die "walletcreatefundedpsbt did not return psbt"

  # 3) process (sign) psbt
  processed="$(bitcoin-cli $flag walletprocesspsbt "$psbt")"
  psbt2="$(echo "$processed" | jq -r '.psbt')"

  # 4) finalize
  finalized="$(bitcoin-cli $flag finalizepsbt "$psbt2")"
  hex="$(echo "$finalized" | jq -r '.hex')"
  complete="$(echo "$finalized" | jq -r '.complete')"
  [[ "$complete" == "true" ]] || die "finalizepsbt not complete"
  echo "$hex" > "$run_dir/rawtx.hex"

  # 5) send
  txid="$(bitcoin-cli $flag sendrawtransaction "$hex")"
  [[ -n "$txid" ]] || die "Failed to send tx"
  echo "$txid" > "$run_dir/txid.txt"

  # proof
  cat > "$run_dir/PROOF.json" <<EOF
{
  "skill": "btc-anchor",
  "version": "1.0.0",
  "timestamp": "$(date -Iseconds)",
  "network": "$BTC_NETWORK",
  "fee_rate_sat_vb": "$BTC_FEE_RATE",
  "op_return_prefix": "$(json_escape "$OP_RETURN_PREFIX")",
  "op_return_hex": "$(json_escape "$payload")",
  "root_hex": "$(json_escape "$root_hex")",
  "txid": "$(json_escape "$txid")",
  "artifacts": {
    "root_hex_file": "root_hex.txt",
    "op_return_hex_file": "op_return_hex.txt",
    "rawtx": "rawtx.hex",
    "txid_file": "txid.txt"
  }
}
EOF

  echo "$run_dir" > "$SKILL_ROOT/outputs/last_run_dir.txt"
  log_info "Anchored on BTC ($BTC_NETWORK). txid=$txid"
  log_info "Run dir: $run_dir"
}
main "$@"