#!/bin/bash

# ============================================
# sync.sh - Host-to-Container code sync script
# ============================================
# Syncs code from /var/www/source (bind mount from host)
# to /var/www/html (container-native filesystem, fast I/O).
#
# Usage:
#   sync.sh init   - Perform initial full sync, then exit
#   sync.sh watch  - Run periodic incremental sync (blocking)
#   sync.sh        - Same as: init + watch
#
# Environment variables:
#   SYNC_INTERVAL  - Polling interval in seconds (default: 3)
#   SYNC_EXTRAS    - Additional rsync exclude patterns (space-separated)
# ============================================

SOURCE_DIR="/var/www/source/"
TARGET_DIR="/var/www/html/"
SYNC_INTERVAL=${SYNC_INTERVAL:-3}

# Build rsync exclude patterns
build_exclude_args() {
    EXCLUDE_ARGS=(
        --exclude='.git'
        --exclude='.gitignore'
        --exclude='.sisyphus'
        --exclude='.opencode'
        --exclude='.agents'
        --exclude='.docker-dev-sync'
        --exclude='.docker-dev.env'
        --exclude='.docker-dev'
        --exclude='docker-dev'
        --exclude='docker-dev-sync'
        --exclude='node_modules'
        --exclude='runtime'
        --exclude='.idea'
        --exclude='.vscode'
        --exclude='*.sock'
        --exclude='.env'
        # vendor is managed by Docker build (composer install), do not overwrite
        --exclude='vendor'
    )

    # Add extra excludes if provided
    if [ -n "$SYNC_EXTRAS" ]; then
        for pattern in $SYNC_EXTRAS; do
            EXCLUDE_ARGS+=(--exclude="$pattern")
        done
    fi
}

# Sync .env separately (excluded from rsync to avoid overwriting on rebuild)
sync_env() {
    if [ -f "/var/www/source/.env" ]; then
        cp /var/www/source/.env /var/www/html/.env 2>/dev/null
    fi
}

# rsync common flags
# --no-perms --no-owner --no-group: don't preserve source permissions (Windows mounts have bad perms)
RSYNC_FLAGS="-a --no-perms --no-owner --no-group"

# ---- Initial full sync ----
do_init() {
    build_exclude_args

    echo "============================================"
    echo "[sync] Starting initial full sync..."
    echo "[sync] Source: ${SOURCE_DIR}"
    echo "[sync] Target: ${TARGET_DIR}"
    echo "============================================"

    rsync ${RSYNC_FLAGS} --delete "${EXCLUDE_ARGS[@]}" "$SOURCE_DIR" "$TARGET_DIR"

    if [ $? -eq 0 ]; then
        echo "[sync] Initial sync complete."
    else
        echo "[sync] WARNING: Initial sync had errors (source may not be mounted yet)."
    fi

    sync_env
}

# ---- Periodic incremental sync (blocking) ----
do_watch() {
    build_exclude_args

    echo "[sync] Starting periodic sync (interval: ${SYNC_INTERVAL}s)..."

    while true; do
        sleep "$SYNC_INTERVAL"

        # Check if source directory is mounted and accessible
        if [ ! -d "/var/www/source" ]; then
            continue
        fi

        # Incremental sync (only changed files)
        rsync ${RSYNC_FLAGS} --delete "${EXCLUDE_ARGS[@]}" "$SOURCE_DIR" "$TARGET_DIR" 2>/dev/null

        # Sync .env separately
        sync_env
    done
}

# ---- Main ----
MODE="${1:-all}"

case "$MODE" in
    init)
        do_init
        ;;
    watch)
        do_watch
        ;;
    all|"")
        do_init
        do_watch
        ;;
    *)
        echo "Usage: $0 [init|watch]"
        echo "  init  - Initial full sync, then exit"
        echo "  watch - Periodic incremental sync (blocking)"
        echo "  (no args) - init + watch"
        exit 1
        ;;
esac