#!/bin/bash
# Switch the C-Chain EVM implementation.
# Usage: ./switch-evm.sh [evm|evmgpu|revm|cpp]

set -e

CCHAIN_VMID="mgj786NP7uDwBCcq6YwThhaN8FLyybkCa4zBWTQbNgmK6k9A6"
PLUGIN_DIR="${HOME}/.lux/plugins/current"

case "${1:-}" in
  evm|go|default)
    TARGET="${HOME}/work/lux/evm/build/evm"
    LABEL="Go EVM (geth/coreth, sequential)"
    ;;
  evmgpu|gpu|parallel)
    TARGET="${HOME}/work/lux/evmgpu/build/evmgpu"
    LABEL="Go EVM-GPU (Block-STM parallel)"
    ;;
  revm|rust|reth)
    TARGET="${HOME}/work/hanzo/evm/target/release/revm"
    LABEL="Rust EVM (reth/revm)"
    ;;
  cpp|evmone|c++)
    echo "C++ EVM requires EVMC→ZAP adapter (not yet available as standalone plugin)"
    echo "Use the C++ benchmark directly: cd ~/work/luxcpp/evm/build && ./bin/evm-bench-block"
    exit 1
    ;;
  status|"")
    CURRENT=$(readlink "${PLUGIN_DIR}/${CCHAIN_VMID}" 2>/dev/null || echo "binary (not symlinked)")
    echo "Current C-Chain EVM: ${CURRENT}"
    echo ""
    echo "Available:"
    echo "  evm      Go EVM (geth/coreth, sequential)"
    echo "  evmgpu   Go EVM-GPU (Block-STM parallel)"
    echo "  revm     Rust EVM (reth/revm)"
    echo "  cpp      C++ EVM (evmone, benchmark only)"
    echo ""
    echo "Usage: $0 <evm|evmgpu|revm|cpp>"
    exit 0
    ;;
  *)
    echo "Unknown EVM: $1"
    echo "Options: evm, evmgpu, revm, cpp"
    exit 1
    ;;
esac

if [ ! -f "${TARGET}" ]; then
  echo "Binary not found: ${TARGET}"
  echo "Build it first."
  exit 1
fi

# Back up current binary if it's not a symlink
if [ -f "${PLUGIN_DIR}/${CCHAIN_VMID}" ] && [ ! -L "${PLUGIN_DIR}/${CCHAIN_VMID}" ]; then
  mv "${PLUGIN_DIR}/${CCHAIN_VMID}" "${PLUGIN_DIR}/${CCHAIN_VMID}.bak"
  echo "Backed up original binary"
fi

ln -sf "${TARGET}" "${PLUGIN_DIR}/${CCHAIN_VMID}"
echo "C-Chain EVM switched to: ${LABEL}"
echo "  ${TARGET}"
echo ""
echo "Restart luxd for changes to take effect."