#!/usr/bin/env bash
set -euo pipefail

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)
workspace=${WEALTH_LEDGER_WORKSPACE:-$(cd "$script_dir/../.." && pwd -P)}
source_root="$workspace/specs/agent-projection/opencode"
projection_root="$workspace/.opencode"

for tree in commands skills; do
  if [[ ! -d "$source_root/$tree" ]]; then
    printf 'Missing canonical projection tree: %s\n' "${source_root#$workspace/}/$tree" >&2
    exit 1
  fi
done

mkdir -p "$projection_root"
stage=$(mktemp -d "$projection_root/.projection-stage.XXXXXX")
backup=$(mktemp -d "$projection_root/.projection-backup.XXXXXX")
commands_existed=0
skills_existed=0
cutover_started=0

cleanup_temporary() {
  rm -rf "$stage" "$backup"
}

rollback() {
  if [[ $cutover_started -eq 1 ]]; then
    rm -rf "$projection_root/commands" "$projection_root/skills"
    if [[ $commands_existed -eq 1 && -d "$backup/commands" ]]; then
      mv "$backup/commands" "$projection_root/commands"
    fi
    if [[ $skills_existed -eq 1 && -d "$backup/skills" ]]; then
      mv "$backup/skills" "$projection_root/skills"
    fi
  fi
  cleanup_temporary
}
trap rollback EXIT

cp -R "$source_root/commands" "$stage/commands"
cp -R "$source_root/skills" "$stage/skills"

if [[ -d "$projection_root/commands" ]]; then
  commands_existed=1
  cp -R "$projection_root/commands" "$backup/commands"
fi
if [[ "${WEALTH_LEDGER_SYNC_FAIL_DURING_BACKUP:-0}" == '1' ]]; then
  printf 'Injected projection backup failure; local projection was not modified.\n' >&2
  exit 1
fi
if [[ -d "$projection_root/skills" ]]; then
  skills_existed=1
  cp -R "$projection_root/skills" "$backup/skills"
fi
cutover_started=1
rm -rf "$projection_root/commands" "$projection_root/skills"

if ! mv "$stage/commands" "$projection_root/commands"; then
  printf 'Projection sync failed while installing commands; previous state will be restored.\n' >&2
  exit 1
fi
if [[ "${WEALTH_LEDGER_SYNC_FAIL_AFTER_COMMANDS:-0}" == '1' ]]; then
  printf 'Injected projection sync failure after commands; previous state will be restored.\n' >&2
  exit 1
fi
if ! mv "$stage/skills" "$projection_root/skills"; then
  printf 'Projection sync failed while installing skills; previous state will be restored.\n' >&2
  exit 1
fi

if ! WEALTH_LEDGER_WORKSPACE="$workspace" bash "$script_dir/verify-agent-projection.sh"; then
  printf 'Projection verification failed after cutover; previous state will be restored.\n' >&2
  exit 1
fi

cutover_started=0
trap - EXIT
cleanup_temporary
printf 'Agent projection synchronized from specs authority.\n'