#!/bin/bash
# Dependencies module for Transmission RSS Manager Installation

function install_dependencies() {
  log "INFO" "Installing dependencies..."

  # Check for package manager
  if command -v apt-get &> /dev/null; then
    # Update package index
    apt-get update

    # Install Node.js and npm if not already installed
    if ! command_exists node; then
      log "INFO" "Installing Node.js and npm..."
      apt-get install -y ca-certificates curl gnupg
      mkdir -p /etc/apt/keyrings
      
      # Check if download succeeds
      if ! curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg; then
        log "ERROR" "Failed to download Node.js GPG key"
        exit 1
      fi
      
      echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_18.x nodistro main" > /etc/apt/sources.list.d/nodesource.list
      
      # Update again after adding repo
      apt-get update
      
      # Install nodejs
      if ! apt-get install -y nodejs; then
        log "ERROR" "Failed to install Node.js"
        exit 1
      fi
    else
      log "INFO" "Node.js is already installed."
    fi

    # Check if we need to install Transmission (only if local transmission was selected and not remote)
    if [ "$TRANSMISSION_REMOTE" = false ] && ([ "$TRANSMISSION_HOST" = "localhost" ] || [ "$TRANSMISSION_HOST" = "127.0.0.1" ]); then
      if ! command_exists transmission-daemon; then
        log "INFO" "Local Transmission installation selected, but transmission-daemon is not installed."
        read -p "Would you like to install Transmission now? (y/n): " install_transmission
        
        if [[ "$install_transmission" =~ ^[Yy]$ ]]; then
          log "INFO" "Installing Transmission..."
          if ! apt-get install -y transmission-daemon; then
            log "ERROR" "Failed to install Transmission"
            log "WARN" "You will need to install Transmission manually before using this application."
          else
            # Stop transmission-daemon to allow configuration changes
            systemctl stop transmission-daemon
            
            # Set default settings
            TRANSMISSION_SETTINGS_DIR="/var/lib/transmission-daemon/info"
            if [ -f "$TRANSMISSION_SETTINGS_DIR/settings.json" ]; then
              # Backup original settings
              cp "$TRANSMISSION_SETTINGS_DIR/settings.json" "$TRANSMISSION_SETTINGS_DIR/settings.json.bak"
              
              # Update RPC settings to allow our app to connect
              sed -i 's/"rpc-authentication-required": true,/"rpc-authentication-required": false,/g' "$TRANSMISSION_SETTINGS_DIR/settings.json"
              sed -i 's/"rpc-whitelist-enabled": true,/"rpc-whitelist-enabled": false,/g' "$TRANSMISSION_SETTINGS_DIR/settings.json"
              
              log "INFO" "Transmission has been configured for local access."
            else
              log "WARN" "Could not find Transmission settings file. You may need to configure Transmission manually."
            fi
            
            # Start transmission-daemon
            systemctl start transmission-daemon
            log "INFO" "Transmission has been installed and started."
          fi
        else
          log "WARN" "Transmission installation skipped. You will need to install it manually."
        fi
      else
        log "INFO" "Transmission is already installed."
      fi
    fi

    # Install additional dependencies
    log "INFO" "Installing additional dependencies..."
    # Try to install unrar-free if unrar is not available
    if ! apt-get install -y unrar 2>/dev/null; then
      log "INFO" "unrar not available, trying unrar-free instead..."
      apt-get install -y unrar-free
    fi
    
    # Install other dependencies
    apt-get install -y unzip p7zip-full
    
    # Try to install nginx
    apt-get install -y nginx || log "WARN" "Nginx installation failed, web interface may not be accessible"
  else
    log "ERROR" "This installer requires apt-get package manager"
    log "INFO" "Please install the following dependencies manually:"
    log "INFO" "- Node.js (v18.x)"
    log "INFO" "- npm"
    log "INFO" "- unrar"
    log "INFO" "- unzip"
    log "INFO" "- p7zip-full"
    log "INFO" "- nginx"
    if [ "$TRANSMISSION_HOST" = "localhost" ] || [ "$TRANSMISSION_HOST" = "127.0.0.1" ]; then
      log "INFO" "- transmission-daemon"
    fi
    exit 1
  fi

  # Check if all dependencies were installed successfully
  local dependencies=("node" "npm" "unzip" "nginx")
  local missing_deps=()
  
  # Add transmission to dependencies check if local installation was selected and not remote
  if [ "$TRANSMISSION_REMOTE" = false ] && ([ "$TRANSMISSION_HOST" = "localhost" ] || [ "$TRANSMISSION_HOST" = "127.0.0.1" ]); then
    dependencies+=("transmission-daemon")
  fi
  
  for dep in "${dependencies[@]}"; do
    if ! command_exists "$dep"; then
      missing_deps+=("$dep")
    fi
  done
  
  # Check for either unrar or unrar-free
  if ! command_exists "unrar" && ! command_exists "unrar-free"; then
    missing_deps+=("unrar")
  fi
  
  # Check for either 7z or 7za (from p7zip-full)
  if ! command_exists "7z" && ! command_exists "7za"; then
    missing_deps+=("p7zip")
  fi
  
  if [ ${#missing_deps[@]} -eq 0 ]; then
    log "INFO" "All dependencies installed successfully."
  else
    log "ERROR" "Failed to install some dependencies: ${missing_deps[*]}"
    log "WARN" "Please install them manually and rerun this script."
    
    # More helpful information based on which deps are missing
    if [[ " ${missing_deps[*]} " =~ " node " ]]; then
      log "INFO" "To install Node.js manually, visit: https://nodejs.org/en/download/"
    fi
    
    if [[ " ${missing_deps[*]} " =~ " nginx " ]]; then
      log "INFO" "To install nginx manually: sudo apt-get install nginx"
    fi
    
    if [[ " ${missing_deps[*]} " =~ " transmission-daemon " ]]; then
      log "INFO" "To install Transmission manually: sudo apt-get install transmission-daemon"
      log "INFO" "After installation, you may need to configure it by editing /var/lib/transmission-daemon/info/settings.json"
    fi
    
    exit 1
  fi
}

function create_directories() {
  log "INFO" "Creating installation directories..."
  
  # Check if INSTALL_DIR is defined
  if [ -z "$INSTALL_DIR" ]; then
    log "ERROR" "INSTALL_DIR is not defined"
    exit 1
  fi
  
  # Check if CONFIG_DIR is defined
  if [ -z "$CONFIG_DIR" ]; then
    log "ERROR" "CONFIG_DIR is not defined"
    exit 1
  fi
  
  # Create directories and check for errors
  DIRECTORIES=(
    "$INSTALL_DIR"
    "$INSTALL_DIR/logs"
    "$INSTALL_DIR/public/js"
    "$INSTALL_DIR/public/css"
    "$INSTALL_DIR/modules"
    "$INSTALL_DIR/data"
    "$CONFIG_DIR"
  )
  
  for dir in "${DIRECTORIES[@]}"; do
    if ! mkdir -p "$dir"; then
      log "ERROR" "Failed to create directory: $dir"
      exit 1
    fi
  done
  
  # Set permissions for configuration directory
  chown -R "$USER:$USER" "$CONFIG_DIR"
  chmod 755 "$CONFIG_DIR"
  
  log "INFO" "Directories created successfully."
}