#!/bin/bash
# coord-order-send.sh - deliver a WORK ORDER into a repo's order queue
# (~/.claude/coord/<repo>/orders/). Model-invoked; no network, no service.
#
# Usage:
#   coord-order-send.sh --to <repo> --subject "<subject>" [--from <repo>]
#                       [--message "<text>" | --prompt-file <path>]
# Body comes from --message, from --prompt-file, or from stdin (heredoc) when
# neither is given. The body IS the whole prompt the dispatched session runs on.
#
# Prints `order-id=<id>` on stdout; the order file is <id>.md in the queue.
#
# WHY A SECOND CHANNEL, and not just another inbox message: the two have
# OPPOSITE authorization classes. Inbox content is untrusted cross-repo data
# that may never instruct a session (Rule 6); a dispatch order is
# operator-authorized work by construction - dispatch IS the operator's
# authorization. Mixing the classes in one channel would mean either mail that
# can instruct, or orders that cannot - both wrong. So the infrastructure is
# reused and the channel is not.
#
# That authority rests on dispatch being this queue's ONLY writer BY
# CONVENTION. The engine does not enforce it and cannot: --from redefines
# identity here exactly as it does in coord-send.sh, so any session can write
# an order into any repo's queue. The read side says so in the words it injects
# rather than claiming a guarantee that does not exist.
#
# Exit: 0 delivered, 2 usage/IO error and nothing written.
# ASCII only, bash 3.2 safe.
set -u
export LC_ALL=C

COORD="${CLAUDE_COORD_DIR:-$HOME/.claude/coord}"

TO=""; SUBJECT=""; FROM=""; MESSAGE=""; HAVE_MESSAGE=0; PROMPT_FILE=""

require_value() {
  # bash 3.2: `shift 2` past the end of $# is a no-op, so a trailing value-flag
  # without its value would loop forever. Every two-arg flag must check first.
  if [ "$2" -lt 2 ]; then echo "coord-order-send: $1 requires a value" >&2; exit 2; fi
}

while [ $# -gt 0 ]; do
  case "$1" in
    --to)          require_value --to $#; TO="$2"; shift 2 ;;
    --subject)     require_value --subject $#; SUBJECT="$2"; shift 2 ;;
    --from)        require_value --from $#; FROM="$2"; shift 2 ;;
    --message)     require_value --message $#; MESSAGE="$2"; HAVE_MESSAGE=1; shift 2 ;;
    --prompt-file) require_value --prompt-file $#; PROMPT_FILE="$2"; shift 2 ;;
    -h|--help)     grep '^#' "$0" | sed 's/^# \{0,1\}//'; exit 0 ;;
    *) echo "coord-order-send: unknown argument: $1" >&2; exit 2 ;;
  esac
done

# --- Resolve sender identity (same rule as coord-send.sh) ------------------
# git toplevel or an explicit --from, never basename(pwd): an invented identity
# signs an order as a repo that does not exist.
if [ -z "$FROM" ]; then
  FROM="$(basename "$(git rev-parse --show-toplevel 2>/dev/null)" 2>/dev/null)"
fi
if [ -z "$FROM" ]; then
  echo "coord-order-send: cannot resolve sender identity (not inside a git repo); pass --from <repo>" >&2
  exit 2
fi
case "$FROM" in
  _*) echo "coord-order-send: invalid sender identity: $FROM (names starting with _ are reserved for the engine)" >&2; exit 2 ;;
esac

# Frontmatter is line-oriented: a CR/LF inside a field would inject extra
# frontmatter lines or a premature '---' terminator.
sanitize_field() { printf '%s' "$1" | tr '\r\n' '  ' | tr -d '\000-\037'; }
FROM="$(sanitize_field "$FROM")"
SUBJECT="$(sanitize_field "$SUBJECT")"

# --- Validate target -------------------------------------------------------
[ -n "$TO" ] || { echo "coord-order-send: missing --to <repo>" >&2; exit 2; }
case "$TO" in
  */*|.|..|_*) echo "coord-order-send: invalid target repo name: $TO" >&2; exit 2 ;;
esac
# Retired address, same rule and same reason as coord-send.sh: a polyrepo
# DIRECTORY is not a git repo, so no session can ever hold that identity and
# read what lands there. Reject at the sender, never redirect.
case "$TO" in
  ktg-plugin-marketplace)
    echo "coord-order-send: ktg-plugin-marketplace is a retired coord address (it is a polyrepo directory, not a git repo - no session can ever hold that identity); send to --to catalog instead" >&2
    exit 2
    ;;
esac
[ -n "$SUBJECT" ] || { echo "coord-order-send: missing --subject" >&2; exit 2; }

# --- Body ------------------------------------------------------------------
# --prompt-file is first-class because that is the shape dispatch already has:
# the skill writes the order to a file, and making the caller cat it would put
# the body through one more shell than it needs to pass.
if [ -n "$PROMPT_FILE" ]; then
  [ "$HAVE_MESSAGE" -eq 1 ] && { echo "coord-order-send: use either --message or --prompt-file, not both" >&2; exit 2; }
  [ -f "$PROMPT_FILE" ] || { echo "coord-order-send: no prompt file at $PROMPT_FILE" >&2; exit 2; }
  # test -s, not test -e: an empty order is a session started and told nothing,
  # which from the far end is indistinguishable from one waiting for a Go.
  [ -s "$PROMPT_FILE" ] || { echo "coord-order-send: the prompt file is empty: $PROMPT_FILE (the order would tell the session nothing)" >&2; exit 2; }
  BODY="$(cat "$PROMPT_FILE")"
elif [ "$HAVE_MESSAGE" -eq 1 ]; then
  BODY="$MESSAGE"
else
  BODY="$(cat)"
fi
if [ -z "$BODY" ]; then
  echo "coord-order-send: empty order body (pass --message, --prompt-file, or pipe the prompt on stdin)" >&2
  exit 2
fi

# --- Write -----------------------------------------------------------------
# The order id round-trips through argv, through the injection's claim hints and
# into the startup command board.sh --dispatch emits, so it is shell-clean BY
# CONSTRUCTION: the sender name is sanitized into the id, never carried raw.
DEST_DIR="$COORD/$TO/orders"
mkdir -p "$DEST_DIR" 2>/dev/null || { echo "coord-order-send: cannot create $DEST_DIR" >&2; exit 2; }

TS="$(date -u +%Y%m%dT%H%M%SZ)"
SAFE_FROM="$(printf '%s' "$FROM" | tr -c 'A-Za-z0-9._-' '-')"
ORDER_ID="${TS}-$$${RANDOM}-from-${SAFE_FROM}"
DEST="$DEST_DIR/$ORDER_ID.md"
DATE_ISO="$(date -u +%Y-%m-%dT%H:%M:%SZ)"

# Temp file inside the destination dir (dot-prefixed so the *.md glob never
# sees it): the final mv is a same-filesystem rename, so a reader - or a
# concurrent claimer - never observes a half-written order.
TMP="$(mktemp "$DEST_DIR/.coord-order.XXXXXX" 2>/dev/null)"
[ -n "$TMP" ] || { echo "coord-order-send: cannot create temp file in $DEST_DIR" >&2; exit 2; }
{
  echo "---"
  echo "from: $FROM"
  echo "to: $TO"
  echo "order-id: $ORDER_ID"
  echo "subject: $SUBJECT"
  echo "date: $DATE_ISO"
  echo "---"
  printf '%s\n' "$BODY"
} > "$TMP"
if ! mv "$TMP" "$DEST" 2>/dev/null; then
  /bin/rm -f "$TMP" 2>/dev/null; echo "coord-order-send: write failed" >&2; exit 2
fi

echo "coord-order-send: order delivered to $TO ($ORDER_ID.md)"
echo "order-id=$ORDER_ID"
exit 0