// Copyright 2025, IPng Networks GmbH, Pim van Pelt <pim@ipng.ch>

package main

import (
	"fmt"
	"log"
	"os"
	"path/filepath"

	"github.com/spf13/cobra"
)

const Version = "1.2.3"

// Config and SSH types are now in separate packages

// SSH connection methods are now in ssh.go

// YAML processing is now handled by the config package

// SSH helper functions are now in ssh.go

func main() {
	var yamlFiles []string
	var password string
	var keyFile string
	var port int
	var outputDir string
	var hostFilter []string

	var rootCmd = &cobra.Command{
		Use:     "ipng-router-backup",
		Short:   "SSH Router Backup Tool",
		Long:    "Connects to routers via SSH and runs commands, saving output to local files.",
		Version: Version,
		Run: func(cmd *cobra.Command, args []string) {
			fmt.Printf("IPng Networks Router Backup v%s\n", Version)

			// Expand glob patterns in YAML files
			var expandedYamlFiles []string
			for _, pattern := range yamlFiles {
				matches, err := filepath.Glob(pattern)
				if err != nil {
					log.Fatalf("Invalid glob pattern '%s': %v", pattern, err)
				}
				if len(matches) == 0 {
					log.Fatalf("No files matched pattern '%s'", pattern)
				}
				expandedYamlFiles = append(expandedYamlFiles, matches...)
			}

			// Load configuration
			cfg, err := ConfigRead(expandedYamlFiles)
			if err != nil {
				log.Fatalf("Failed to load config: %v", err)
			}

			// Check authentication setup
			if password == "" && keyFile == "" {
				if os.Getenv("SSH_AUTH_SOCK") != "" {
					fmt.Println("Using SSH agent for authentication")
				} else {
					keyFile = findDefaultSSHKey()
					if keyFile == "" {
						log.Fatal("No SSH key found and no password provided")
					}
				}
			}

			// Process devices
			if len(cfg.Devices) == 0 {
				log.Fatal("No devices found in config file")
			}

			// Filter devices if --host flags are provided
			devicesToProcess := cfg.Devices
			if len(hostFilter) > 0 {
				devicesToProcess = make(map[string]Device)
				for _, pattern := range hostFilter {
					patternMatched := false
					for hostname, deviceConfig := range cfg.Devices {
						if matched, _ := filepath.Match(pattern, hostname); matched {
							devicesToProcess[hostname] = deviceConfig
							patternMatched = true
						}
					}
					if !patternMatched {
						fmt.Printf("Warning: Host pattern '%s' did not match any devices\n", pattern)
					}
				}
			}

			successCount := 0
			totalCount := len(devicesToProcess)

			for hostname, deviceConfig := range devicesToProcess {
				fmt.Printf("\nProcessing device: %s (type: %s)\n", hostname, deviceConfig.Type)

				user := deviceConfig.User
				commands := deviceConfig.Commands
				deviceType := deviceConfig.Type

				// If device has a type, get commands from types section
				if deviceType != "" {
					if typeConfig, exists := cfg.Types[deviceType]; exists {
						commands = typeConfig.Commands
					}
				}

				if user == "" {
					fmt.Printf("No user specified for %s, skipping\n", hostname)
					continue
				}

				if len(commands) == 0 {
					fmt.Printf("No commands specified for %s, skipping\n", hostname)
					continue
				}

				// Create backup instance
				backup := NewRouterBackup(hostname, deviceConfig.Address, user, password, keyFile, port)

				// Connect and backup
				if err := backup.Connect(); err != nil {
					fmt.Printf("Failed to connect to %s: %v\n", hostname, err)
					continue
				}

				err = backup.BackupCommands(commands, outputDir)
				backup.Disconnect()

				if err != nil {
					fmt.Printf("Backup failed for %s: %v\n", hostname, err)
				} else {
					fmt.Printf("Backup completed for %s\n", hostname)
					successCount++
				}
			}

			fmt.Printf("\nOverall summary: %d/%d devices processed successfully\n", successCount, totalCount)

			// Set exit code based on results
			if successCount == 0 {
				os.Exit(11) // All devices failed
			} else if successCount < totalCount {
				os.Exit(10) // Some devices failed
			}
			// Exit code 0 (success) when all devices succeeded
		},
	}

	rootCmd.Flags().StringSliceVar(&yamlFiles, "yaml", []string{}, "YAML configuration file paths (required, can be repeated)")
	rootCmd.Flags().StringVar(&password, "password", "", "SSH password")
	rootCmd.Flags().StringVar(&keyFile, "key-file", "", "SSH private key file path")
	rootCmd.Flags().IntVar(&port, "port", 22, "SSH port")
	rootCmd.Flags().StringVar(&outputDir, "output-dir", "/tmp", "Output directory for command output files")
	rootCmd.Flags().StringSliceVar(&hostFilter, "host", []string{}, "Specific host(s) to process (can be repeated, processes all if not specified)")

	rootCmd.MarkFlagRequired("yaml")

	if err := rootCmd.Execute(); err != nil {
		log.Fatal(err)
	}
}