#!/usr/bin/env bash
set -Eeuo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
VAULT_PATH="${VAULT_PATH:-$PROJECT_DIR/content-forge}"
LOG_FILE="${LOG_FILE:-$PROJECT_DIR/logs/vault-sync.log}"

log() {
    echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" >> "$LOG_FILE"
}

# Verify vault directory exists
if [[ ! -d "$VAULT_PATH" ]]; then
    log "ERROR: Vault directory does not exist: $VAULT_PATH"
    exit 1
fi

cd "$VAULT_PATH" || {
    log "ERROR: Failed to cd into vault: $VAULT_PATH"
    exit 1
}

# Remove stale index.lock if no git process is actively using it
LOCK_FILE="$VAULT_PATH/.git/index.lock"
if [[ -f "$LOCK_FILE" ]]; then
    if ! fuser "$LOCK_FILE" >/dev/null 2>&1; then
        log "WARN: Removing stale index.lock (no process holding it)"
        rm -f "$LOCK_FILE"
    else
        log "ERROR: index.lock held by active process, skipping sync"
        exit 1
    fi
fi

# Skip if no changes
if git diff --quiet && git diff --cached --quiet && [ -z "$(git ls-files --others --exclude-standard)" ]; then
    log "No changes to sync"
    exit 0
fi

# Get current branch dynamically
BRANCH=$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo "main")

# Stage all changes
if ! git add -A; then
    log "ERROR: git add failed"
    exit 1
fi

# Commit with timestamp
if ! git commit -m "vault: auto-sync $(date '+%Y-%m-%d %H:%M')"; then
    log "ERROR: git commit failed"
    exit 1
fi

# Push with error handling
if ! git push origin "$BRANCH"; then
    log "ERROR: git push failed (branch: $BRANCH)"
    exit 1
fi

log "Sync successful: pushed to $BRANCH"