#!/bin/bash

#
# Rsync Deployment Script for markusgraf.ch
#
# This script deploys the Hugo-built static site to the production server
# via rsync over SSH, mirroring the content (including deletions).
#
# Prerequisites:
#   - Hugo site must be built (public/ directory exists)
#   - SSH access to the server must be configured
#   - SSH_USER, SSH_HOST environment variables must be set
#
# Usage:
#   export SSH_USER='your-username'
#   export SSH_HOST='your-server.com'
#   export SSH_PORT='22'  # optional, defaults to 22
#   export REMOTE_ROOT='/httpsdocs'  # optional, defaults to /httpsdocs
#   ./scripts/deploy.sh
#
# Server Details:
#   - Default Target Directory: /httpsdocs
#   - Default Port: 22
#   - Source Directory: public/
#

set -e  # Exit on error
set -u  # Exit on undefined variable

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

# Configuration
SSH_PORT="${SSH_PORT:-22}"
REMOTE_ROOT="${REMOTE_ROOT:-/httpsdocs}"
SOURCE_DIR="public"

#
# Print error message in red and exit
#
error() {
    echo -e "${RED}ERROR: $1${NC}" >&2
    exit 1
}

#
# Print warning message in yellow
#
warn() {
    echo -e "${YELLOW}WARNING: $1${NC}" >&2
}

#
# Print success message in green
#
success() {
    echo -e "${GREEN}$1${NC}"
}

#
# Print info message
#
info() {
    echo "$1"
}

#
# Check all prerequisites before deployment
#
check_prerequisites() {
    info "Checking prerequisites..."

    # Check if public/ directory exists and is not empty
    if [ ! -d "$SOURCE_DIR" ]; then
        error "Directory '$SOURCE_DIR' does not exist. Please run 'hugo build' first."
    fi

    if [ ! "$(ls -A $SOURCE_DIR)" ]; then
        error "Directory '$SOURCE_DIR' is empty. Please run 'hugo build' first."
    fi

    # Check if rsync is installed
    if ! command -v rsync &> /dev/null; then
        error "rsync is not installed. Please install rsync:
    Ubuntu/Debian: sudo apt-get install rsync
    macOS: rsync is pre-installed
    Fedora: sudo dnf install rsync"
    fi

    # Check if SSH_USER is set
    if [ -z "${SSH_USER:-}" ]; then
        error "SSH_USER environment variable is not set.
    Please set it before running this script:
    export SSH_USER='your-username'"
    fi

    # Check if SSH_HOST is set
    if [ -z "${SSH_HOST:-}" ]; then
        error "SSH_HOST environment variable is not set.
    Please set it before running this script:
    export SSH_HOST='your-server.com'"
    fi

    success "All prerequisites met."
}

#
# Deploy site to server via rsync
#
deploy() {
    info "Starting deployment to $SSH_HOST..."
    info "Connecting as user: $SSH_USER"
    info "Port: $SSH_PORT"
    info "Syncing from: $SOURCE_DIR/"
    info "Target directory: $REMOTE_ROOT/"

    # Use rsync to mirror the content
    # -a: archive mode (preserves permissions, timestamps, etc.)
    # -v: verbose output
    # -z: compress data during transfer
    # --delete: delete files on remote that don't exist locally (mirror behavior)
    # -e: specify SSH with custom port
    rsync -avz --delete -e "ssh -p $SSH_PORT" "$SOURCE_DIR/" "$SSH_USER@$SSH_HOST:$REMOTE_ROOT/"

    local exit_code=$?

    if [ $exit_code -eq 0 ]; then
        success "Deployment completed successfully!"
        info "Files have been synced to $SSH_HOST:$REMOTE_ROOT"
        return 0
    else
        error "Deployment failed with exit code $exit_code.

Troubleshooting:
  - Verify SSH credentials and key-based authentication is set up
  - Check network connectivity to $SSH_HOST
  - Ensure the target directory '$REMOTE_ROOT' exists on the server
  - Verify SSH_USER has write permissions to $REMOTE_ROOT
  - Try connecting manually: ssh -p $SSH_PORT $SSH_USER@$SSH_HOST"
    fi
}

#
# Main execution
#
main() {
    info "=== Rsync Deployment Script ==="
    info ""

    check_prerequisites
    info ""

    deploy
}

# Run main function
main