package tui

import (
	"bufio"
	"encoding/json"
	"fmt"
	"os"
	"strings"
)

// App represents the TUI application
type App struct {
	client *APIClient
	reader *bufio.Reader
}

// NewApp creates a new TUI application
func NewApp(client *APIClient) *App {
	return &App{
		client: client,
		reader: bufio.NewReader(os.Stdin),
	}
}

// Run starts the TUI application
func (a *App) Run() error {
	// Check if authenticated
	if a.client.token == "" {
		if err := a.login(); err != nil {
			return fmt.Errorf("login failed: %w", err)
		}
	}

	// Main menu loop
	for {
		a.showMainMenu()
		choice := a.readInput("Select option: ")

		switch choice {
		case "1":
			a.handleZFSMenu()
		case "2":
			a.handleStorageMenu()
		case "3":
			a.handleSnapshotMenu()
		case "4":
			a.handleSystemMenu()
		case "5":
			a.handleBackupMenu()
		case "0", "q", "exit":
			fmt.Println("Goodbye!")
			return nil
		default:
			fmt.Println("Invalid option. Please try again.")
		}
	}
}

// Cleanup performs cleanup operations
func (a *App) Cleanup() {
	fmt.Println("\nCleaning up...")
}

// login handles user authentication
func (a *App) login() error {
	fmt.Println("=== AtlasOS Login ===")
	username := a.readInput("Username: ")
	password := a.readPassword("Password: ")

	token, err := a.client.Login(username, password)
	if err != nil {
		return err
	}

	fmt.Println("Login successful!")
	_ = token
	return nil
}

// readInput reads a line of input
func (a *App) readInput(prompt string) string {
	fmt.Print(prompt)
	input, _ := a.reader.ReadString('\n')
	return strings.TrimSpace(input)
}

// readPassword reads a password (without echoing)
func (a *App) readPassword(prompt string) string {
	fmt.Print(prompt)
	// Simple implementation - in production, use a library that hides input
	input, _ := a.reader.ReadString('\n')
	return strings.TrimSpace(input)
}

// showMainMenu displays the main menu
func (a *App) showMainMenu() {
	fmt.Println("\n=== AtlasOS Terminal Interface ===")
	fmt.Println("1. ZFS Management")
	fmt.Println("2. Storage Services")
	fmt.Println("3. Snapshots")
	fmt.Println("4. System Information")
	fmt.Println("5. Backup & Restore")
	fmt.Println("0. Exit")
	fmt.Println()
}

// handleZFSMenu handles ZFS management menu
func (a *App) handleZFSMenu() {
	for {
		fmt.Println("\n=== ZFS Management ===")
		fmt.Println("1. List Pools")
		fmt.Println("2. List Datasets")
		fmt.Println("3. List ZVOLs")
		fmt.Println("4. List Disks")
		fmt.Println("0. Back")
		fmt.Println()

		choice := a.readInput("Select option: ")

		switch choice {
		case "1":
			a.listPools()
		case "2":
			a.listDatasets()
		case "3":
			a.listZVOLs()
		case "4":
			a.listDisks()
		case "0":
			return
		default:
			fmt.Println("Invalid option.")
		}
	}
}

// handleStorageMenu handles storage services menu
func (a *App) handleStorageMenu() {
	for {
		fmt.Println("\n=== Storage Services ===")
		fmt.Println("1. SMB Shares")
		fmt.Println("2. NFS Exports")
		fmt.Println("3. iSCSI Targets")
		fmt.Println("0. Back")
		fmt.Println()

		choice := a.readInput("Select option: ")

		switch choice {
		case "1":
			a.handleSMBMenu()
		case "2":
			a.handleNFSMenu()
		case "3":
			a.handleISCSIMenu()
		case "0":
			return
		default:
			fmt.Println("Invalid option.")
		}
	}
}

// handleSnapshotMenu handles snapshot management menu
func (a *App) handleSnapshotMenu() {
	for {
		fmt.Println("\n=== Snapshot Management ===")
		fmt.Println("1. List Snapshots")
		fmt.Println("2. Create Snapshot")
		fmt.Println("3. List Snapshot Policies")
		fmt.Println("0. Back")
		fmt.Println()

		choice := a.readInput("Select option: ")

		switch choice {
		case "1":
			a.listSnapshots()
		case "2":
			a.createSnapshot()
		case "3":
			a.listSnapshotPolicies()
		case "0":
			return
		default:
			fmt.Println("Invalid option.")
		}
	}
}

// handleSystemMenu handles system information menu
func (a *App) handleSystemMenu() {
	for {
		fmt.Println("\n=== System Information ===")
		fmt.Println("1. System Info")
		fmt.Println("2. Health Check")
		fmt.Println("3. Dashboard")
		fmt.Println("0. Back")
		fmt.Println()

		choice := a.readInput("Select option: ")

		switch choice {
		case "1":
			a.showSystemInfo()
		case "2":
			a.showHealthCheck()
		case "3":
			a.showDashboard()
		case "0":
			return
		default:
			fmt.Println("Invalid option.")
		}
	}
}

// handleBackupMenu handles backup and restore menu
func (a *App) handleBackupMenu() {
	for {
		fmt.Println("\n=== Backup & Restore ===")
		fmt.Println("1. List Backups")
		fmt.Println("2. Create Backup")
		fmt.Println("3. Restore Backup")
		fmt.Println("0. Back")
		fmt.Println()

		choice := a.readInput("Select option: ")

		switch choice {
		case "1":
			a.listBackups()
		case "2":
			a.createBackup()
		case "3":
			a.restoreBackup()
		case "0":
			return
		default:
			fmt.Println("Invalid option.")
		}
	}
}

// listPools lists all ZFS pools
func (a *App) listPools() {
	data, err := a.client.Get("/api/v1/pools")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var pools []map[string]interface{}
	if err := json.Unmarshal(data, &pools); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== ZFS Pools ===")
	if len(pools) == 0 {
		fmt.Println("No pools found.")
		return
	}

	for i, pool := range pools {
		fmt.Printf("%d. %s\n", i+1, pool["name"])
		if size, ok := pool["size"].(string); ok {
			fmt.Printf("   Size: %s\n", size)
		}
		if used, ok := pool["used"].(string); ok {
			fmt.Printf("   Used: %s\n", used)
		}
		fmt.Println()
	}
}

// listDatasets lists all datasets
func (a *App) listDatasets() {
	data, err := a.client.Get("/api/v1/datasets")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var datasets []map[string]interface{}
	if err := json.Unmarshal(data, &datasets); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== Datasets ===")
	if len(datasets) == 0 {
		fmt.Println("No datasets found.")
		return
	}

	for i, ds := range datasets {
		fmt.Printf("%d. %s\n", i+1, ds["name"])
		if mountpoint, ok := ds["mountpoint"].(string); ok && mountpoint != "" {
			fmt.Printf("   Mountpoint: %s\n", mountpoint)
		}
		fmt.Println()
	}
}

// listZVOLs lists all ZVOLs
func (a *App) listZVOLs() {
	data, err := a.client.Get("/api/v1/zvols")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var zvols []map[string]interface{}
	if err := json.Unmarshal(data, &zvols); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== ZVOLs ===")
	if len(zvols) == 0 {
		fmt.Println("No ZVOLs found.")
		return
	}

	for i, zvol := range zvols {
		fmt.Printf("%d. %s\n", i+1, zvol["name"])
		if size, ok := zvol["size"].(float64); ok {
			fmt.Printf("   Size: %.2f bytes\n", size)
		}
		fmt.Println()
	}
}

// listDisks lists available disks
func (a *App) listDisks() {
	data, err := a.client.Get("/api/v1/disks")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var disks []map[string]interface{}
	if err := json.Unmarshal(data, &disks); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== Available Disks ===")
	if len(disks) == 0 {
		fmt.Println("No disks found.")
		return
	}

	for i, disk := range disks {
		fmt.Printf("%d. %s\n", i+1, disk["name"])
		if size, ok := disk["size"].(string); ok {
			fmt.Printf("   Size: %s\n", size)
		}
		if model, ok := disk["model"].(string); ok {
			fmt.Printf("   Model: %s\n", model)
		}
		fmt.Println()
	}
}

// listSnapshots lists all snapshots
func (a *App) listSnapshots() {
	data, err := a.client.Get("/api/v1/snapshots")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var snapshots []map[string]interface{}
	if err := json.Unmarshal(data, &snapshots); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== Snapshots ===")
	if len(snapshots) == 0 {
		fmt.Println("No snapshots found.")
		return
	}

	for i, snap := range snapshots {
		fmt.Printf("%d. %s\n", i+1, snap["name"])
		if dataset, ok := snap["dataset"].(string); ok {
			fmt.Printf("   Dataset: %s\n", dataset)
		}
		fmt.Println()
	}
}

// createSnapshot creates a new snapshot
func (a *App) createSnapshot() {
	dataset := a.readInput("Dataset name: ")
	name := a.readInput("Snapshot name: ")

	reqBody := map[string]interface{}{
		"dataset": dataset,
		"name":    name,
	}

	data, err := a.client.Post("/api/v1/snapshots", reqBody)
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var result map[string]interface{}
	if err := json.Unmarshal(data, &result); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("Snapshot created successfully!")
	if name, ok := result["name"].(string); ok {
		fmt.Printf("Snapshot: %s\n", name)
	}
}

// listSnapshotPolicies lists snapshot policies
func (a *App) listSnapshotPolicies() {
	data, err := a.client.Get("/api/v1/snapshot-policies")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var policies []map[string]interface{}
	if err := json.Unmarshal(data, &policies); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== Snapshot Policies ===")
	if len(policies) == 0 {
		fmt.Println("No policies found.")
		return
	}

	for i, policy := range policies {
		fmt.Printf("%d. Dataset: %s\n", i+1, policy["dataset"])
		fmt.Printf("   Frequent: %v, Hourly: %v, Daily: %v\n",
			policy["frequent"], policy["hourly"], policy["daily"])
		fmt.Println()
	}
}

// handleSMBMenu handles SMB shares menu
func (a *App) handleSMBMenu() {
	for {
		fmt.Println("\n=== SMB Shares ===")
		fmt.Println("1. List Shares")
		fmt.Println("2. Create Share")
		fmt.Println("0. Back")
		fmt.Println()

		choice := a.readInput("Select option: ")

		switch choice {
		case "1":
			a.listSMBShares()
		case "2":
			a.createSMBShare()
		case "0":
			return
		default:
			fmt.Println("Invalid option.")
		}
	}
}

// listSMBShares lists SMB shares
func (a *App) listSMBShares() {
	data, err := a.client.Get("/api/v1/shares/smb")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var shares []map[string]interface{}
	if err := json.Unmarshal(data, &shares); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== SMB Shares ===")
	if len(shares) == 0 {
		fmt.Println("No shares found.")
		return
	}

	for i, share := range shares {
		fmt.Printf("%d. %s\n", i+1, share["name"])
		if path, ok := share["path"].(string); ok {
			fmt.Printf("   Path: %s\n", path)
		}
		fmt.Println()
	}
}

// createSMBShare creates a new SMB share
func (a *App) createSMBShare() {
	name := a.readInput("Share name: ")
	dataset := a.readInput("Dataset: ")
	path := a.readInput("Path (optional, press Enter to auto-detect): ")
	description := a.readInput("Description (optional): ")

	reqBody := map[string]interface{}{
		"name":    name,
		"dataset": dataset,
	}

	if path != "" {
		reqBody["path"] = path
	}
	if description != "" {
		reqBody["description"] = description
	}

	data, err := a.client.Post("/api/v1/shares/smb", reqBody)
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	fmt.Println("SMB share created successfully!")
	var result map[string]interface{}
	if err := json.Unmarshal(data, &result); err == nil {
		if name, ok := result["name"].(string); ok {
			fmt.Printf("Share: %s\n", name)
		}
	}
}

// handleNFSMenu handles NFS exports menu
func (a *App) handleNFSMenu() {
	for {
		fmt.Println("\n=== NFS Exports ===")
		fmt.Println("1. List Exports")
		fmt.Println("2. Create Export")
		fmt.Println("0. Back")
		fmt.Println()

		choice := a.readInput("Select option: ")

		switch choice {
		case "1":
			a.listNFSExports()
		case "2":
			a.createNFSExport()
		case "0":
			return
		default:
			fmt.Println("Invalid option.")
		}
	}
}

// listNFSExports lists NFS exports
func (a *App) listNFSExports() {
	data, err := a.client.Get("/api/v1/exports/nfs")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var exports []map[string]interface{}
	if err := json.Unmarshal(data, &exports); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== NFS Exports ===")
	if len(exports) == 0 {
		fmt.Println("No exports found.")
		return
	}

	for i, export := range exports {
		fmt.Printf("%d. Path: %s\n", i+1, export["path"])
		if clients, ok := export["clients"].([]interface{}); ok {
			fmt.Printf("   Clients: %v\n", clients)
		}
		fmt.Println()
	}
}

// createNFSExport creates a new NFS export
func (a *App) createNFSExport() {
	dataset := a.readInput("Dataset: ")
	path := a.readInput("Path (optional, press Enter to auto-detect): ")
	clientsStr := a.readInput("Clients (comma-separated, e.g., 192.168.1.0/24,*): ")

	clients := []string{}
	if clientsStr != "" {
		clients = strings.Split(clientsStr, ",")
		for i := range clients {
			clients[i] = strings.TrimSpace(clients[i])
		}
	}

	reqBody := map[string]interface{}{
		"dataset": dataset,
		"clients": clients,
	}

	if path != "" {
		reqBody["path"] = path
	}

	data, err := a.client.Post("/api/v1/exports/nfs", reqBody)
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	fmt.Println("NFS export created successfully!")
	var result map[string]interface{}
	if err := json.Unmarshal(data, &result); err == nil {
		if path, ok := result["path"].(string); ok {
			fmt.Printf("Export: %s\n", path)
		}
	}
}

// handleISCSIMenu handles iSCSI targets menu
func (a *App) handleISCSIMenu() {
	for {
		fmt.Println("\n=== iSCSI Targets ===")
		fmt.Println("1. List Targets")
		fmt.Println("2. Create Target")
		fmt.Println("0. Back")
		fmt.Println()

		choice := a.readInput("Select option: ")

		switch choice {
		case "1":
			a.listISCSITargets()
		case "2":
			a.createISCSITarget()
		case "0":
			return
		default:
			fmt.Println("Invalid option.")
		}
	}
}

// listISCSITargets lists iSCSI targets
func (a *App) listISCSITargets() {
	data, err := a.client.Get("/api/v1/iscsi/targets")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var targets []map[string]interface{}
	if err := json.Unmarshal(data, &targets); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== iSCSI Targets ===")
	if len(targets) == 0 {
		fmt.Println("No targets found.")
		return
	}

	for i, target := range targets {
		fmt.Printf("%d. %s\n", i+1, target["iqn"])
		if luns, ok := target["luns"].([]interface{}); ok {
			fmt.Printf("   LUNs: %d\n", len(luns))
		}
		fmt.Println()
	}
}

// createISCSITarget creates a new iSCSI target
func (a *App) createISCSITarget() {
	iqn := a.readInput("IQN (e.g., iqn.2024-12.com.atlas:target1): ")

	reqBody := map[string]interface{}{
		"iqn": iqn,
	}

	data, err := a.client.Post("/api/v1/iscsi/targets", reqBody)
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	fmt.Println("iSCSI target created successfully!")
	var result map[string]interface{}
	if err := json.Unmarshal(data, &result); err == nil {
		if iqn, ok := result["iqn"].(string); ok {
			fmt.Printf("Target: %s\n", iqn)
		}
	}
}

// showSystemInfo displays system information
func (a *App) showSystemInfo() {
	data, err := a.client.Get("/api/v1/system/info")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var info map[string]interface{}
	if err := json.Unmarshal(data, &info); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== System Information ===")
	if version, ok := info["version"].(string); ok {
		fmt.Printf("Version: %s\n", version)
	}
	if uptime, ok := info["uptime"].(string); ok {
		fmt.Printf("Uptime: %s\n", uptime)
	}
	if goVersion, ok := info["go_version"].(string); ok {
		fmt.Printf("Go Version: %s\n", goVersion)
	}
	if numGoroutines, ok := info["num_goroutines"].(float64); ok {
		fmt.Printf("Goroutines: %.0f\n", numGoroutines)
	}

	if services, ok := info["services"].(map[string]interface{}); ok {
		fmt.Println("\nServices:")
		for name, service := range services {
			if svc, ok := service.(map[string]interface{}); ok {
				if status, ok := svc["status"].(string); ok {
					fmt.Printf("  %s: %s\n", name, status)
				}
			}
		}
	}
}

// showHealthCheck displays health check information
func (a *App) showHealthCheck() {
	data, err := a.client.Get("/health")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var health map[string]interface{}
	if err := json.Unmarshal(data, &health); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== Health Check ===")
	if status, ok := health["status"].(string); ok {
		fmt.Printf("Status: %s\n", status)
	}

	if checks, ok := health["checks"].(map[string]interface{}); ok {
		fmt.Println("\nComponent Checks:")
		for name, status := range checks {
			fmt.Printf("  %s: %v\n", name, status)
		}
	}
}

// showDashboard displays dashboard information
func (a *App) showDashboard() {
	data, err := a.client.Get("/api/v1/dashboard")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var dashboard map[string]interface{}
	if err := json.Unmarshal(data, &dashboard); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== Dashboard ===")
	if pools, ok := dashboard["pools"].([]interface{}); ok {
		fmt.Printf("Pools: %d\n", len(pools))
	}
	if datasets, ok := dashboard["datasets"].([]interface{}); ok {
		fmt.Printf("Datasets: %d\n", len(datasets))
	}
	if smbShares, ok := dashboard["smb_shares"].([]interface{}); ok {
		fmt.Printf("SMB Shares: %d\n", len(smbShares))
	}
	if nfsExports, ok := dashboard["nfs_exports"].([]interface{}); ok {
		fmt.Printf("NFS Exports: %d\n", len(nfsExports))
	}
	if iscsiTargets, ok := dashboard["iscsi_targets"].([]interface{}); ok {
		fmt.Printf("iSCSI Targets: %d\n", len(iscsiTargets))
	}
}

// listBackups lists all backups
func (a *App) listBackups() {
	data, err := a.client.Get("/api/v1/backups")
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	var backups []map[string]interface{}
	if err := json.Unmarshal(data, &backups); err != nil {
		fmt.Printf("Error parsing response: %v\n", err)
		return
	}

	fmt.Println("\n=== Backups ===")
	if len(backups) == 0 {
		fmt.Println("No backups found.")
		return
	}

	for i, backup := range backups {
		fmt.Printf("%d. %s\n", i+1, backup["id"])
		if createdAt, ok := backup["created_at"].(string); ok {
			fmt.Printf("   Created: %s\n", createdAt)
		}
		if desc, ok := backup["description"].(string); ok && desc != "" {
			fmt.Printf("   Description: %s\n", desc)
		}
		fmt.Println()
	}
}

// createBackup creates a new backup
func (a *App) createBackup() {
	description := a.readInput("Description (optional): ")

	reqBody := map[string]interface{}{}
	if description != "" {
		reqBody["description"] = description
	}

	data, err := a.client.Post("/api/v1/backups", reqBody)
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	fmt.Println("Backup created successfully!")
	var result map[string]interface{}
	if err := json.Unmarshal(data, &result); err == nil {
		if id, ok := result["id"].(string); ok {
			fmt.Printf("Backup ID: %s\n", id)
		}
	}
}

// restoreBackup restores a backup
func (a *App) restoreBackup() {
	a.listBackups()
	backupID := a.readInput("Backup ID: ")

	confirm := a.readInput("Restore backup? This will overwrite current configuration. (yes/no): ")
	if confirm != "yes" {
		fmt.Println("Restore cancelled.")
		return
	}

	reqBody := map[string]interface{}{
		"dry_run": false,
	}

	data, err := a.client.Post("/api/v1/backups/"+backupID+"/restore", reqBody)
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	fmt.Println("Backup restored successfully!")
	var result map[string]interface{}
	if err := json.Unmarshal(data, &result); err == nil {
		if msg, ok := result["message"].(string); ok {
			fmt.Printf("%s\n", msg)
		}
	}
}