#!/bin/bash
set -euo pipefail

# sync_skills.sh — Install/sync IPA Workflow skills from source repos
# Usage: ./scripts/sync_skills.sh [--global|--workspace] [--source <name>]

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(dirname "$SCRIPT_DIR")"

GLOBAL_DIR="$HOME/.gemini/antigravity/skills"
WORKSPACE_DIR=".agent/skills"
INSTALL_MODE="global"
SOURCE_FILTER=""

usage() {
  echo "Usage: $0 [--global|--workspace] [--source <name>]"
  echo ""
  echo "Options:"
  echo "  --global     Install to $GLOBAL_DIR (default)"
  echo "  --workspace  Install to $WORKSPACE_DIR (relative to cwd)"
  echo "  --source     Only sync skills from named source in skills_sources.json"
  echo ""
  exit 1
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --global) INSTALL_MODE="global"; shift ;;
    --workspace) INSTALL_MODE="workspace"; shift ;;
    --source) SOURCE_FILTER="$2"; shift 2 ;;
    -h|--help) usage ;;
    *) echo "Unknown option: $1"; usage ;;
  esac
done

if [[ "$INSTALL_MODE" == "global" ]]; then
  DEST="$GLOBAL_DIR"
else
  DEST="$WORKSPACE_DIR"
fi

echo "==> Installing skills to: $DEST"
mkdir -p "$DEST"

# 1. Copy local skills from this repo
if [[ -d "$REPO_ROOT/skills" ]]; then
  echo "==> Syncing local skills..."
  if command -v rsync &>/dev/null; then
    rsync -av --exclude='.gitkeep' "$REPO_ROOT/skills/" "$DEST/"
  else
    cp -r "$REPO_ROOT/skills/"* "$DEST/" 2>/dev/null || true
  fi
  echo "==> Local skills synced."
fi

# 2. Copy project templates if --workspace
if [[ "$INSTALL_MODE" == "workspace" && -d "$REPO_ROOT/templates" ]]; then
  echo "==> Copying project templates..."
  if [[ -d "$REPO_ROOT/templates/docs" ]]; then
    mkdir -p "./docs"
    for tmpl in "$REPO_ROOT/templates/docs/"*.template; do
      [[ -f "$tmpl" ]] || continue
      base="$(basename "$tmpl" .template)"
      if [[ ! -f "./docs/$base" ]]; then
        cp "$tmpl" "./docs/$base"
        echo "    Created docs/$base"
      else
        echo "    Skipped docs/$base (already exists)"
      fi
    done
  fi
fi

# 3. Sync external sources from skills_sources.json
SOURCES_FILE="$REPO_ROOT/skills_sources.json"
if [[ -f "$SOURCES_FILE" ]]; then
  ENTRIES=$(python3 -c "
import json, sys
with open('$SOURCES_FILE') as f:
    sources = json.load(f)
for s in sources:
    if '$SOURCE_FILTER' and s.get('name') != '$SOURCE_FILTER':
        continue
    print(f\"{s['name']}|{s['url']}|{s.get('path', 'skills')}\")
" 2>/dev/null || true)

  if [[ -n "$ENTRIES" ]]; then
    while IFS='|' read -r name url path; do
      echo "==> Syncing external source: $name ($url)"
      TMP_DIR="/tmp/ag-sync-$name"
      rm -rf "$TMP_DIR"
      git clone --depth 1 "$url" "$TMP_DIR" 2>/dev/null
      if [[ -d "$TMP_DIR/$path" ]]; then
        if command -v rsync &>/dev/null; then
          rsync -av --exclude='.gitkeep' "$TMP_DIR/$path/" "$DEST/"
        else
          cp -r "$TMP_DIR/$path/"* "$DEST/" 2>/dev/null || true
        fi
      fi
      rm -rf "$TMP_DIR"
      echo "==> Source '$name' synced."
    done <<< "$ENTRIES"
  fi
fi

echo "==> Done. Skills installed to: $DEST"