#!/bin/bash

# Configuration
LOCAL_PATH="/path/to/your/local/project"
REMOTE_USER="your_ssh_user"
REMOTE_HOST="your.remote.dev.server"
REMOTE_PATH="/var/www/remote/project"

# SSH Key (optional, if not using ssh-agent or password auth)
# SSH_KEY="~/.ssh/id_rsa_your_project"

# Exclude list for rsync (paths relative to LOCAL_PATH)
EXCLUDE_LIST=(
    ".git/"
    "node_modules/"
    "vendor/" # For PHP projects
    "dist/"
    "build/"
    "*.log"
    ".env"
    ".DS_Store"
)

# --- Functions ---

# Function to display script usage
usage() {
    echo "Usage: $0 [OPTIONS]"
    echo "  Syncs local project directory to a remote development server using rsync."
    echo ""
    echo "Options:"
    echo "  -n, --dry-run    Perform a dry run (show what would be synced without making changes)"
    echo "  -v, --verbose    Enable verbose output for rsync"
    echo "  -h, --help       Show this help message"
    exit 0
}

# --- Main Script Logic ---

DRY_RUN=""
VERBOSE_FLAG=""

# Parse command-line arguments
while (( "$#" )); do
    case "$1" in
        -n|--dry-run)
            DRY_RUN="-n"
            echo "Performing a dry run. No actual files will be transferred."
            ;;
        -v|--verbose)
            VERBOSE_FLAG="-v"
            echo "Verbose output enabled."
            ;;
        -h|--help)
            usage
            ;;
        *)
            echo "Error: Invalid argument '$1'."
            usage
            ;;
    esac
    shift
done

echo "Starting rsync synchronization..."
echo "  Local: $LOCAL_PATH"
echo "  Remote: $REMOTE_USER@$REMOTE_HOST:$REMOTE_PATH"

# Build the exclude arguments for rsync
RSYNC_EXCLUDE_ARGS=""
for item in "${EXCLUDE_LIST[@]}"; do
    RSYNC_EXCLUDE_ARGS+="--exclude='$item' "
done

# Rsync command explanation:
# -a: archive mode (preserves permissions, ownership, timestamps, recursive)
# -z: compress file data during transfer
# -h: human-readable output
# -P: show progress during transfer and allow resuming (equivalent to --partial --progress)
# $DRY_RUN: -n for dry run, empty otherwise
# $VERBOSE_FLAG: -v for verbose, empty otherwise
# --delete: delete extraneous files from destination (dry run will show these)
# --rsh="ssh -p 22 -i $SSH_KEY": specify SSH command if custom key/port needed (commented out by default)

# Check if LOCAL_PATH exists
if [ ! -d "$LOCAL_PATH" ]; then
    echo "Error: Local path '$LOCAL_PATH' does not exist or is not a directory."
    exit 1
}

# Execute rsync command
# Using eval to correctly parse the RSYNC_EXCLUDE_ARGS with quotes
eval rsync -azhP "$DRY_RUN" "$VERBOSE_FLAG" $RSYNC_EXCLUDE_ARGS \
    --delete \
    "$LOCAL_PATH/" "$REMOTE_USER@$REMOTE_HOST:$REMOTE_PATH"

if [ $? -eq 0 ]; then
    echo "Rsync synchronization finished successfully."
    if [ -n "$DRY_RUN" ]; then
        echo "This was a DRY RUN. No files were actually changed on the remote server."
    fi
else
    echo "Rsync synchronization failed."
    exit 1
fi