package cluster

import (
	"fmt"
	"net/http"
	"net/url"
	"os"
	"path/filepath"

	"github.com/spf13/cobra"

	"github.com/wild-cloud/wild-cli/internal/config"
	"github.com/wild-cloud/wild-cli/internal/environment"
	"github.com/wild-cloud/wild-cli/internal/external"
	"github.com/wild-cloud/wild-cli/internal/output"
)

func newNodesCommand() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "nodes",
		Short: "Manage cluster nodes",
		Long:  `Manage Kubernetes cluster nodes.`,
	}

	cmd.AddCommand(
		newNodesListCommand(),
		newNodesBootCommand(),
	)

	return cmd
}

func newNodesListCommand() *cobra.Command {
	return &cobra.Command{
		Use:   "list",
		Short: "List cluster nodes",
		Long: `List and show status of cluster nodes.

This command shows the status of both configured nodes and running cluster nodes.

Examples:
  wild cluster nodes list`,
		RunE: runNodesList,
	}
}

func newNodesBootCommand() *cobra.Command {
	return &cobra.Command{
		Use:   "boot",
		Short: "Boot cluster nodes",
		Long: `Boot and configure cluster nodes by downloading boot assets.

This command downloads Talos boot assets including kernel, initramfs, and ISO images
for PXE booting or USB creation.

Examples:
  wild cluster nodes boot`,
		RunE: runNodesBoot,
	}
}

func runNodesList(cmd *cobra.Command, args []string) error {
	output.Header("Cluster Nodes Status")

	// Initialize environment
	env := environment.New()
	if err := env.RequiresProject(); err != nil {
		return err
	}

	// Load configuration
	configMgr := config.NewManager(env.ConfigPath(), env.SecretsPath())

	// Show configured nodes
	output.Info("=== Configured Nodes ===")
	nodesConfig, err := configMgr.Get("cluster.nodes")
	if err != nil || nodesConfig == nil {
		output.Warning("No nodes configured")
		output.Info("Add nodes to config: wild config set cluster.nodes '[{\"ip\": \"192.168.1.10\", \"role\": \"controlplane\"}]'")
	} else {
		nodes, ok := nodesConfig.([]interface{})
		if !ok || len(nodes) == 0 {
			output.Warning("No nodes configured")
		} else {
			for i, nodeConfig := range nodes {
				nodeMap, ok := nodeConfig.(map[string]interface{})
				if !ok {
					output.Warning(fmt.Sprintf("Invalid node %d configuration", i))
					continue
				}

				nodeIP := nodeMap["ip"]
				nodeRole := nodeMap["role"]
				if nodeRole == nil {
					nodeRole = "worker"
				}

				output.Info(fmt.Sprintf("  Node %d: %v (%v)", i+1, nodeIP, nodeRole))
			}
		}
	}

	// Try to show running cluster nodes if kubectl is available
	toolManager := external.NewManager()
	if err := toolManager.CheckTools(cmd.Context(), []string{"kubectl"}); err == nil {
		kubectl := toolManager.Kubectl()
		if nodesOutput, err := kubectl.GetNodes(cmd.Context()); err == nil {
			output.Info("\n=== Running Cluster Nodes ===")
			output.Info(string(nodesOutput))
		} else {
			output.Info("\n=== Running Cluster Nodes ===")
			output.Warning("Could not connect to cluster: " + err.Error())
		}
	} else {
		output.Info("\n=== Running Cluster Nodes ===")
		output.Warning("kubectl not available - cannot show running cluster status")
	}

	return nil
}

func runNodesBoot(cmd *cobra.Command, args []string) error {
	output.Header("Talos Installer Image Generation and Asset Download")

	// Initialize environment
	env := environment.New()
	if err := env.RequiresProject(); err != nil {
		return err
	}

	// Load configuration
	configMgr := config.NewManager(env.ConfigPath(), env.SecretsPath())

	// Check for required configuration
	talosVersion, err := configMgr.Get("cluster.nodes.talos.version")
	if err != nil || talosVersion == nil {
		return fmt.Errorf("missing required configuration: cluster.nodes.talos.version")
	}

	schematicID, err := configMgr.Get("cluster.nodes.talos.schematicId")
	if err != nil || schematicID == nil {
		return fmt.Errorf("missing required configuration: cluster.nodes.talos.schematicId")
	}

	talosVersionStr := talosVersion.(string)
	schematicIDStr := schematicID.(string)

	if talosVersionStr == "" || schematicIDStr == "" {
		return fmt.Errorf("talos version and schematic ID cannot be empty")
	}

	output.Info("Creating custom Talos installer image...")
	output.Info("Talos version: " + talosVersionStr)
	output.Info("Schematic ID: " + schematicIDStr)

	// Show schematic extensions if available
	if extensions, err := configMgr.Get("cluster.nodes.talos.schematic.customization.systemExtensions.officialExtensions"); err == nil && extensions != nil {
		if extList, ok := extensions.([]interface{}); ok && len(extList) > 0 {
			output.Info("\nSchematic includes:")
			for _, ext := range extList {
				output.Info("  - " + fmt.Sprintf("%v", ext))
			}
			output.Info("")
		}
	}

	// Generate installer image URL
	installerURL := fmt.Sprintf("factory.talos.dev/metal-installer/%s:%s", schematicIDStr, talosVersionStr)
	output.Success("Custom installer image URL generated!")
	output.Info("")
	output.Info("Installer URL: " + installerURL)

	// Download and cache assets
	output.Header("Downloading and Caching PXE Boot Assets")

	// Create cache directories organized by schematic ID
	cacheDir := filepath.Join(env.WildCloudDir())
	schematicCacheDir := filepath.Join(cacheDir, "node-boot-assets", schematicIDStr)
	pxeCacheDir := filepath.Join(schematicCacheDir, "pxe")
	ipxeCacheDir := filepath.Join(schematicCacheDir, "ipxe")
	isoCacheDir := filepath.Join(schematicCacheDir, "iso")

	if err := os.MkdirAll(filepath.Join(pxeCacheDir, "amd64"), 0755); err != nil {
		return fmt.Errorf("creating cache directories: %w", err)
	}
	if err := os.MkdirAll(ipxeCacheDir, 0755); err != nil {
		return fmt.Errorf("creating cache directories: %w", err)
	}
	if err := os.MkdirAll(isoCacheDir, 0755); err != nil {
		return fmt.Errorf("creating cache directories: %w", err)
	}

	// Download Talos kernel and initramfs for PXE boot
	output.Info("Downloading Talos PXE assets...")
	kernelURL := fmt.Sprintf("https://pxe.factory.talos.dev/image/%s/%s/kernel-amd64", schematicIDStr, talosVersionStr)
	initramfsURL := fmt.Sprintf("https://pxe.factory.talos.dev/image/%s/%s/initramfs-amd64.xz", schematicIDStr, talosVersionStr)

	kernelPath := filepath.Join(pxeCacheDir, "amd64", "vmlinuz")
	initramfsPath := filepath.Join(pxeCacheDir, "amd64", "initramfs.xz")

	// Download assets
	if err := downloadAsset(kernelURL, kernelPath, "Talos kernel"); err != nil {
		return fmt.Errorf("downloading kernel: %w", err)
	}

	if err := downloadAsset(initramfsURL, initramfsPath, "Talos initramfs"); err != nil {
		return fmt.Errorf("downloading initramfs: %w", err)
	}

	// Download iPXE bootloader files
	output.Info("Downloading iPXE bootloader assets...")
	ipxeAssets := map[string]string{
		"http://boot.ipxe.org/ipxe.efi":           filepath.Join(ipxeCacheDir, "ipxe.efi"),
		"http://boot.ipxe.org/undionly.kpxe":      filepath.Join(ipxeCacheDir, "undionly.kpxe"),
		"http://boot.ipxe.org/arm64-efi/ipxe.efi": filepath.Join(ipxeCacheDir, "ipxe-arm64.efi"),
	}

	for downloadURL, path := range ipxeAssets {
		description := fmt.Sprintf("iPXE %s", filepath.Base(path))
		if err := downloadAsset(downloadURL, path, description); err != nil {
			output.Warning(fmt.Sprintf("Failed to download %s: %v", description, err))
		}
	}

	// Download Talos ISO
	output.Info("Downloading Talos ISO...")
	isoURL := fmt.Sprintf("https://factory.talos.dev/image/%s/%s/metal-amd64.iso", schematicIDStr, talosVersionStr)
	isoFilename := fmt.Sprintf("talos-%s-metal-amd64.iso", talosVersionStr)
	isoPath := filepath.Join(isoCacheDir, isoFilename)

	if err := downloadAsset(isoURL, isoPath, "Talos ISO"); err != nil {
		return fmt.Errorf("downloading ISO: %w", err)
	}

	output.Success("All assets downloaded and cached!")
	output.Info("")
	output.Info(fmt.Sprintf("Cached assets for schematic %s:", schematicIDStr))
	output.Info(fmt.Sprintf("  Talos kernel:     %s", kernelPath))
	output.Info(fmt.Sprintf("  Talos initramfs:  %s", initramfsPath))
	output.Info(fmt.Sprintf("  Talos ISO:        %s", isoPath))
	output.Info(fmt.Sprintf("  iPXE EFI:         %s", filepath.Join(ipxeCacheDir, "ipxe.efi")))
	output.Info(fmt.Sprintf("  iPXE BIOS:        %s", filepath.Join(ipxeCacheDir, "undionly.kpxe")))
	output.Info(fmt.Sprintf("  iPXE ARM64:       %s", filepath.Join(ipxeCacheDir, "ipxe-arm64.efi")))
	output.Info("")
	output.Info(fmt.Sprintf("Cache location: %s", schematicCacheDir))
	output.Info("")
	output.Info("Use these assets for:")
	output.Info("  - PXE boot: Use kernel and initramfs from cache")
	output.Info("  - USB creation: Use ISO file for dd or imaging tools")
	output.Info(fmt.Sprintf("    Example: sudo dd if=%s of=/dev/sdX bs=4M status=progress", isoPath))
	output.Info(fmt.Sprintf("  - Custom installer: https://%s", installerURL))

	output.Success("Installer image generation and asset caching completed!")
	return nil
}

// downloadAsset downloads a file with progress indication
func downloadAsset(downloadURL, path, description string) error {
	// Check if file already exists
	if _, err := os.Stat(path); err == nil {
		output.Info(fmt.Sprintf("%s already cached at %s", description, path))
		return nil
	}

	output.Info(fmt.Sprintf("Downloading %s...", description))
	output.Info(fmt.Sprintf("URL: %s", downloadURL))

	// Parse URL to validate
	parsedURL, err := url.Parse(downloadURL)
	if err != nil {
		return fmt.Errorf("invalid URL: %w", err)
	}

	// Create HTTP client
	client := &http.Client{}
	req, err := http.NewRequest("GET", parsedURL.String(), nil)
	if err != nil {
		return fmt.Errorf("creating request: %w", err)
	}

	resp, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("downloading: %w", err)
	}
	defer func() {
		_ = resp.Body.Close()
	}()

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("download failed with status: %s", resp.Status)
	}

	// Create destination file
	if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
		return fmt.Errorf("creating directory: %w", err)
	}

	file, err := os.Create(path)
	if err != nil {
		return fmt.Errorf("creating file: %w", err)
	}
	defer func() {
		_ = file.Close()
	}()

	// Copy data
	if _, err := file.ReadFrom(resp.Body); err != nil {
		return fmt.Errorf("writing file: %w", err)
	}

	// Verify download
	if stat, err := os.Stat(path); err != nil || stat.Size() == 0 {
		_ = os.Remove(path)
		return fmt.Errorf("download failed or file is empty")
	}

	output.Success(fmt.Sprintf("%s downloaded successfully", description))
	return nil
}