import * as fs from 'fs'
import { initConfig, loadConfig, migrateConfigIfNeeded } from '../lib/config'

// Command to initialize a new zzup.yaml file
export async function cmdInit() {
  try {
    const configPath = migrateConfigIfNeeded()
    console.log(`Initializing zzup configuration in ${configPath}...`)

    // Check if file already exists
    if (fs.existsSync(configPath)) {
      console.log(`Configuration file already exists: ${configPath}`)
      console.log(
        'Edit the configuration file directly to add or update images.'
      )
      return 0
    }

    // Create a new config file
    initConfig(configPath)
    console.log(`Created new configuration file: ${configPath}`)
    console.log(`Edit the file directly to add images in one of these formats:`)
    console.log(`
# Standard format (with explicit source and target directories):
image-name:
  tag: latest
  sourceDir: /source/dir/
  targetDir: /target/dir/

# Shorthand format (using manifest from the image):
image-name: "latest"    # Just specify the tag
    `)

    return 0
  } catch (error) {
    console.error(`Error initializing configuration: ${error}`)
    return 1
  }
}

// Command to list configured images
export async function cmdConfigList() {
  try {
    const configPath = migrateConfigIfNeeded()

    // Check if config file exists
    if (!fs.existsSync(configPath)) {
      console.log(`No configuration file found at ${configPath}`)
      console.log('Run "zzup init" to create a new configuration.')
      return 0
    }

    // Load config
    const config = loadConfig()

    // Get image names
    const imageNames = Object.keys(config)

    if (imageNames.length === 0) {
      console.log(`No images configured in ${configPath}`)
      console.log('Edit the configuration file to add images.')
      return 0
    }

    console.log(`Configured Images:`)
    console.log('')

    // Display each configured image
    imageNames.forEach((imageName, index) => {
      const imageConfig = config[imageName]
      console.log(`${imageName}:${imageConfig.tag}`)

      // Only show source and target if they exist
      if (imageConfig.sourceDir) {
        console.log(`   Source: ${imageConfig.sourceDir}`)
      }
      if (imageConfig.targetDir) {
        console.log(`   Target: ${imageConfig.targetDir}`)
      }

      // If neither source nor target is specified, show it's using manifest
      if (!imageConfig.sourceDir && !imageConfig.targetDir) {
        console.log(`   (Using manifest from image)`)
      }

      // Add spacing between items except the last one
      if (index < imageNames.length - 1) {
        console.log('')
      }
    })

    return 0
  } catch (error) {
    console.error(`Error listing configuration: ${error}`)
    return 1
  }
}