#!/usr/bin/env bash
#
# Copy channel-gated bundled skills into the app bundle.
#
# Usage:
#   copy_conditional_skills <channel> <gated_skills_src> <dest_skills_dir>
#
# Arguments:
#   channel:          Release channel (local, dev, preview, stable).
#   gated_skills_src: Path to resources/channel-gated-skills/.
#   dest_skills_dir:  Destination skills directory (e.g. .../bundled/skills/).
#
# Gating is progressive: earlier gates include all skills from later gates.
# For example, a dogfood build includes skills from both dogfood/ and
# preview/.  The stable channel has no gate — stable-ready skills belong
# in resources/bundled/skills/ (the always-bundled directory).

set -e

if [ $# -ne 3 ]; then
  echo "Usage: $0 <channel> <gated_skills_src> <dest_skills_dir>" >&2
  exit 1
fi

CHANNEL="$1"
GATED_SKILLS_SRC="$2"
DEST_SKILLS_DIR="$3"

# Gate labels ordered from most-inclusive to least-inclusive.
# A channel's gate includes all gates at or after its position.
GATE_ORDER=("dogfood" "preview")

if [ ! -d "$GATED_SKILLS_SRC" ]; then
  exit 0
fi

# Error out if a stable/ gate directory exists — stable skills should live
# in the always-bundled resources/bundled/skills/ directory instead.
if [ -d "$GATED_SKILLS_SRC/stable" ]; then
  echo "Error: found a 'stable/' directory in $GATED_SKILLS_SRC." >&2
  echo "The stable channel does not use gated skills. Move stable-ready skills to resources/bundled/skills/ (the always-bundled directory) instead." >&2
  exit 1
fi

# Map the release channel to its gate label.
case "$CHANNEL" in
  local|dev) GATE="dogfood" ;;
  preview)   GATE="preview" ;;
  *)
    echo "  Channel '$CHANNEL' has no gated skills, skipping"
    exit 0
    ;;
esac

# Build the set of included gates (progressive: this gate and all after it).
INCLUDED_GATES=()
FOUND=false
for g in "${GATE_ORDER[@]}"; do
  if [ "$g" = "$GATE" ]; then
    FOUND=true
  fi
  if [ "$FOUND" = true ]; then
    INCLUDED_GATES+=("$g")
  fi
done

# Helper: check if a value is in the included gates list.
is_included() {
  local needle="$1"
  for g in "${INCLUDED_GATES[@]}"; do
    if [ "$g" = "$needle" ]; then
      return 0
    fi
  done
  return 1
}

# Iterate over gate directories and copy matching skills.
for gate_dir in "$GATED_SKILLS_SRC"/*/; do
  # Skip if the glob didn't match anything.
  [ -d "$gate_dir" ] || continue

  gate_name="$(basename "$gate_dir")"

  if ! is_included "$gate_name"; then
    # List the skills that would have been included for the skip message.
    skills=""
    for skill_dir in "$gate_dir"/*/; do
      [ -d "$skill_dir" ] || continue
      if [ -n "$skills" ]; then
        skills="$skills, "
      fi
      skills="$skills$(basename "$skill_dir")"
    done
    echo "  Skipping gate '$gate_name' (channel '$CHANNEL') — would include: $skills"
    continue
  fi

  for skill_dir in "$gate_dir"/*/; do
    [ -d "$skill_dir" ] || continue

    skill_name="$(basename "$skill_dir")"
    dest="$DEST_SKILLS_DIR/$skill_name"
    echo "  Copying gated skill: $skill_name (gate: $gate_name)"
    mkdir -p "$dest"
    cp -R "$skill_dir"/. "$dest"/
  done
done