#!/bin/bash
# auto-rebuild-watcher.sh — inotifywait daemon for garden content/ changes
#
# Runs as a systemd service (garden-content-watcher.service).
# Watches ~/projects/garden/content/ recursively and triggers garden-build.sh
# on file create/modify/delete/move events.
#
# Debounce: waits 3 seconds after the last event before triggering rebuild,
# so rapid batch edits (e.g. `git pull`, bulk copy) cause one rebuild, not N.

set -euo pipefail

CONTENT_DIR="$HOME/projects/garden/content"
BUILD_SCRIPT="$HOME/pulse/garden-build.sh"

if [ ! -d "$CONTENT_DIR" ]; then
    echo "✗ Content dir not found: $CONTENT_DIR"
    exit 1
fi

if [ ! -x "$BUILD_SCRIPT" ]; then
    echo "✗ Build script not found/executable: $BUILD_SCRIPT"
    exit 1
fi

echo "=== Garden content watcher starting at $(date -u) ==="
echo "  Watching: $CONTENT_DIR"
echo "  Rebuild:  $BUILD_SCRIPT"

# Initial rebuild on startup (content may have changed while watcher was down)
bash "$BUILD_SCRIPT"

# Monitor with inotifywait — recursive, all file events in content/
inotifywait -m -r -e modify -e create -e delete -e move \
    --format '%e %w%f' \
    "$CONTENT_DIR" 2>/dev/null |
while IFS= read -r line; do
    EVENT_TYPE="${line%% *}"
    FILE_PATH="${line#* }"
    
    # Debounce flag: touch a temp flag, sleep 3 seconds, then rebuild if
    # the flag is still there (no newer event removed it)
    FLAG="${HOME}/projects/garden/.rebuild-pending"
    touch "$FLAG"
    sleep 3
    
    if [ -f "$FLAG" ]; then
        rm -f "$FLAG"
        echo "→ Content change detected: $EVENT_TYPE ${FILE_PATH##$HOME/projects/garden/content/}"
        bash "$BUILD_SCRIPT"
    fi
done