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

# Two roots (see src/shared/paths.ts):
#   DEN_ENGINE_ROOT  Den's own package: this script's parent directory, which
#                    in a distribution is node_modules/@monster-orange/den.
#   DEN_ROOT         the distribution: the directory holding den.yml. A
#                    distribution's bin/<cli> shim sets it; in Den's own
#                    checkout (where the engine dir holds den.yml) it is set
#                    here. Otherwise it is left unset and Den walks up from
#                    the entry script to find den.yml.
DEN_ENGINE_ROOT="$(cd "$(dirname "$(realpath "$0")")/.." && pwd)"
export DEN_ENGINE_ROOT
if [ -z "${DEN_ROOT:-}" ] && [ -f "$DEN_ENGINE_ROOT/den.yml" ]; then
  DEN_ROOT="$DEN_ENGINE_ROOT"
  export DEN_ROOT
fi
export DEN_INVOKE_CWD="$PWD"
export OP_ACCOUNT="${OP_ACCOUNT:-example.1password.com}"

# tsx: Den's own (a checkout) or hoisted into the distribution's node_modules.
find_tsx() {
  local dir="$DEN_ENGINE_ROOT"
  while :; do
    if [ -x "$dir/node_modules/.bin/tsx" ]; then
      printf '%s\n' "$dir/node_modules/.bin/tsx"
      return 0
    fi
    [ "$dir" = "/" ] && return 1
    dir="$(dirname "$dir")"
  done
}

# `create` scaffolds a new distribution: it needs no den.yml, so it runs on
# its own entry point rather than the full CLI.
entry="src/ui/cli/index.ts"
built="dist/src/ui/cli/index.js"
if [ "${1:-}" = "create" ]; then
  shift
  entry="src/ui/cli/create-main.ts"
  built="dist/src/ui/cli/create-main.js"
fi
# `mcp` speaks the MCP protocol on stdout: its own entry point, so nothing
# the full CLI prints can reach the protocol stream. Its setup subcommands
# (connect, disconnect, clients, config) are ordinary CLI commands.
if [ "${1:-}" = "mcp" ] && ! case "${2:-}" in connect|disconnect|clients|config) true ;; *) false ;; esac; then
  shift
  entry="src/ui/cli/mcp-main.ts"
  built="dist/src/ui/cli/mcp-main.js"
fi

# Escape hatch: force the compiled build (e.g. to test the prod artifact).
if [ "${DEN_USE_DIST:-}" = "1" ] && [ -f "$DEN_ENGINE_ROOT/$built" ]; then
  exec node "$DEN_ENGINE_ROOT/$built" "$@"
fi

# Prefer live TypeScript source (the package ships src/ and runs it with tsx).
# A built dist/ is gitignored and only refreshed by `npm run build`, so
# preferring it would silently shadow local source edits with a stale build.
if tsx="$(find_tsx)"; then
  exec "$tsx" "$DEN_ENGINE_ROOT/$entry" "$@"
fi

if [ -f "$DEN_ENGINE_ROOT/$built" ]; then
  exec node "$DEN_ENGINE_ROOT/$built" "$@"
fi

echo "den: no runnable entrypoint: run 'npm install'" >&2
exit 1