#!/bin/bash
# chezmoi-auto-sync.sh — watches ~/.claude/ and ~/.local/share/chezmoi/docs/ for changes
# and syncs to chezmoi source + git. Called by the launchd WatchPaths agent.
#
# IMPORTANT: Do NOT sync ~/.claude/skills/ here — skills managed by .chezmoiexternal.toml
# (ffmpeg-usage, swift-front, etc.) are cloned from their own repos. Adding them here
# flattens their .git/ dirs into the dotfiles repo and causes conflicts.

set -euo pipefail

LOCKFILE="/tmp/chezmoi-sync.lock"
LOG="/tmp/chezmoi-sync.log"

# Prevent concurrent runs
if [ -f "$LOCKFILE" ]; then
    pid=$(cat "$LOCKFILE" 2>/dev/null)
    if kill -0 "$pid" 2>/dev/null; then
        exit 0
    fi
fi
echo $$ > "$LOCKFILE"
trap 'rm -f "$LOCKFILE"' EXIT

log() {
    echo "$(date '+%Y-%m-%d %H:%M:%S') $1" >> "$LOG"
}

# Debounce — wait 2 seconds for batch changes to settle
sleep 2

log "Change detected in watched paths, syncing..."

# Purge .DS_Store files from ~/.claude/ BEFORE chezmoi sees them
# (Finder creates these constantly; they're noise)
find ~/.claude -name ".DS_Store" -delete 2>/dev/null || true

# Pull first to avoid conflicts (rebase local changes on top)
cd "$(chezmoi source-path)"
git pull --rebase --quiet origin main 2>> "$LOG" || {
    log "WARNING: git pull --rebase failed, attempting merge"
    git rebase --abort 2>/dev/null
    git pull --quiet origin main 2>> "$LOG" || log "ERROR: git pull failed"
}

# Remove any .DS_Store from source before adding new files
find "$(chezmoi source-path)" -name ".DS_Store" -o -name "dot_DS_Store" | xargs rm -f 2>/dev/null

# Only sync files we explicitly manage — NOT skills (managed by .chezmoiexternal.toml)
chezmoi add ~/.claude/CLAUDE.md 2>> "$LOG" || true
chezmoi add ~/.claude/agents/ 2>> "$LOG" || true
chezmoi add ~/.claude/settings.json 2>> "$LOG" || true
chezmoi add ~/.claude/commands/ 2>> "$LOG" || true
chezmoi add ~/.claude/hooks/ 2>> "$LOG" || true
chezmoi add ~/.claude/statusline-command.sh 2>> "$LOG" || true
chezmoi add ~/.claude/scripts/task-durations/extract.py 2>> "$LOG" || true
chezmoi add ~/.claude/scripts/task-durations/estimate.sh 2>> "$LOG" || true
chezmoi add ~/.claude/scripts/task-durations/pull-fleet.sh 2>> "$LOG" || true
chezmoi add ~/.local/bin/chezmoi-auto-sync.sh 2>> "$LOG" || true

# Clean up any .DS_Store that chezmoi added
cd "$(chezmoi source-path)"
git rm --cached -r --quiet $(git ls-files --cached | grep -i "DS_Store") 2>/dev/null || true

# Catch any uncommitted changes in the source dir that chezmoi's autoCommit missed
# (e.g., direct edits to ~/.local/share/chezmoi/docs/, which is the same git repo
# but not under chezmoi's "managed" tree). When chezmoi add was a no-op, autoCommit
# doesn't fire, so those edits sit uncommitted without this fallback.
if ! git diff --quiet || ! git diff --cached --quiet || [ -n "$(git ls-files --others --exclude-standard)" ]; then
    git add -A 2>> "$LOG"
    git commit -m "Auto-sync from $(hostname -s)" 2>> "$LOG" || true
    git push 2>> "$LOG" || true
    log "Pushed uncommitted source changes (e.g. docs/)"
fi

log "Sync complete"