#!/usr/bin/env bash
#
# Post-Commit Hook for Stream Worktrees
#
# Purpose: Track commit count and trigger dashboard sync every 3-5 commits
# Location: Installed to each worktree's .git/hooks/post-commit by start_stream
#
# This hook automatically:
# 1. Increments commit counter
# 2. Triggers dashboard sync when threshold reached (default: 3 commits)
# 3. Resets counter after sync
#
# The dashboard sync runs in the background (non-blocking) and updates
# STATUS_DASHBOARD.md in the main project with current progress.
#

set -e

# ============================================================================
# Configuration
# ============================================================================

WORKTREE_DIR="$(git rev-parse --show-toplevel)"
COUNT_FILE="${WORKTREE_DIR}/.git/info/commit-count"
HOOK_DIR="$(cd "$(dirname "$0")" && pwd)"

# Get sync threshold from git config (default: 3)
SYNC_THRESHOLD="$(git config --get stream-workflow.sync-threshold || echo "3")"

# ============================================================================
# Commit Counter
# ============================================================================

# Read current count
if [ -f "$COUNT_FILE" ]; then
  COUNT=$(cat "$COUNT_FILE")
else
  COUNT=0
fi

# Increment
COUNT=$((COUNT + 1))
echo "$COUNT" > "$COUNT_FILE"

echo "[post-commit] Commit #${COUNT} since last dashboard sync"

# ============================================================================
# Dashboard Sync Trigger
# ============================================================================

if [ "$COUNT" -ge "$SYNC_THRESHOLD" ]; then
  echo "[post-commit] Threshold reached (${COUNT}/${SYNC_THRESHOLD}) - syncing dashboard..."

  # Reset counter immediately (before sync to avoid race conditions)
  echo "0" > "$COUNT_FILE"

  # Trigger dashboard sync in background (non-blocking)
  # This allows the commit to complete immediately
  if [ -x "${HOOK_DIR}/sync-dashboard.sh" ]; then
    "${HOOK_DIR}/sync-dashboard.sh" &
    SYNC_PID=$!
    echo "[post-commit] Dashboard sync started (PID: ${SYNC_PID})"
  else
    echo "[post-commit] Warning: sync-dashboard.sh not found or not executable"
    echo "[post-commit] Expected: ${HOOK_DIR}/sync-dashboard.sh"
  fi
else
  REMAINING=$((SYNC_THRESHOLD - COUNT))
  echo "[post-commit] ${REMAINING} more commit(s) until next dashboard sync"
fi

# Exit successfully (don't block commit)
exit 0