package cli

import (
	"context"
	"fmt"
	"os"
	"strconv"
	"strings"
	"text/tabwriter"

	"github.com/spf13/cobra"
)

func NewAccountCmd() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "account",
		Short: "Manage your TermCloud account",
		Long:  "Create, authenticate, and manage your TermCloud account",
	}

	cmd.AddCommand(newAccountCreateCmd())
	cmd.AddCommand(newAccountLoginCmd())
	cmd.AddCommand(newAccountInfoCmd())
	cmd.AddCommand(newAccountTopUpCmd())
	cmd.AddCommand(newAccountPaymentsCmd())
	cmd.AddCommand(newAccountUsageCmd())

	return cmd
}

func newAccountCreateCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "create",
		Short: "Create a new TermCloud account",
		RunE: func(cmd *cobra.Command, args []string) error {
			config, err := LoadConfig()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			client := NewClient(config.ServerURL, "")
			ctx := context.Background()

			account, err := client.CreateAccount(ctx)
			if err != nil {
				return fmt.Errorf("failed to create account: %w", err)
			}

			config.AccountNumber = account.AccountNumber
			config.AccessToken = account.AccessToken
			if err := config.Save(); err != nil {
				return fmt.Errorf("failed to save config: %w", err)
			}

			fmt.Printf("Account created successfully!\n")
			fmt.Printf("Account Number: %s\n", account.AccountNumber)
			fmt.Printf("Access Token: %s\n", account.AccessToken)
			fmt.Printf("Status: %s\n", getAccountStatus(account))
			fmt.Printf("\nIMPORTANT: Save your account number and access token!\n")
			fmt.Printf("You are now logged in. Add funds using: tcman account top-up 1\n")

			return nil
		},
	}
}

func newAccountLoginCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "login <account-number> <access-token>",
		Short: "Login to an existing account",
		Args:  cobra.ExactArgs(2),
		RunE: func(cmd *cobra.Command, args []string) error {
			accountNumber := args[0]
			accessToken := args[1]

			config, err := LoadConfig()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			client := NewClient(config.ServerURL, accessToken)
			ctx := context.Background()

			account, err := client.GetAccount(ctx)
			if err != nil {
				return fmt.Errorf("failed to authenticate: %w", err)
			}

			if account.AccountNumber != accountNumber {
				return fmt.Errorf("account number mismatch")
			}

			config.AccountNumber = accountNumber
			config.AccessToken = accessToken
			if err := config.Save(); err != nil {
				return fmt.Errorf("failed to save config: %w", err)
			}

			fmt.Printf("Successfully logged in!\n")
			fmt.Printf("Account: %s\n", account.AccountNumber)
			fmt.Printf("Status: %s\n", getAccountStatus(account))
			fmt.Printf("Balance: $%.2f USD\n", account.BalanceUSD)

			return nil
		},
	}
}

func newAccountInfoCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "info",
		Short: "Show account information",
		RunE: func(cmd *cobra.Command, args []string) error {
			config, err := LoadConfig()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			if !config.IsAuthenticated() {
				return fmt.Errorf("not logged in. Use 'tcman account login' or 'tcman account create'")
			}

			client := NewClient(config.ServerURL, config.AccessToken)
			ctx := context.Background()

			account, err := client.GetAccount(ctx)
			if err != nil {
				return fmt.Errorf("failed to get account info: %w", err)
			}

			fmt.Printf("Account Information:\n")
			fmt.Printf("  Number: %s\n", account.AccountNumber)
			fmt.Printf("  Status: %s\n", getAccountStatus(account))
			fmt.Printf("  Balance: $%.2f USD\n", account.BalanceUSD)
			fmt.Printf("  Created: %s\n", account.CreatedAt.Format("2006-01-02 15:04:05"))
			if account.ActivatedAt != nil {
				fmt.Printf("  Activated: %s\n", account.ActivatedAt.Format("2006-01-02 15:04:05"))
			}
			fmt.Printf("  Last Billing: %s\n", account.LastBillingDate.Format("2006-01-02"))

			return nil
		},
	}
}

func newAccountTopUpCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "top-up <amount> [account-number]",
		Short: "Add funds to your account via Bitcoin",
		Long:  "Add funds to your account. If logged in, uses your account. If not logged in, provide account number.",
		Args:  cobra.RangeArgs(1, 2),
		RunE: func(cmd *cobra.Command, args []string) error {
			amount, err := strconv.ParseFloat(args[0], 64)
			if err != nil {
				return fmt.Errorf("invalid amount: %w", err)
			}

			if amount < 1.0 {
				return fmt.Errorf("minimum top-up amount is $1.00 USD")
			}

			config, err := LoadConfig()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			var accountNumber string

			if len(args) == 2 {
				accountNumber = args[1]
			} else if config.IsAuthenticated() {
				accountNumber = config.AccountNumber
			} else if config.AccountNumber != "" {
				accountNumber = config.AccountNumber
			} else {
				return fmt.Errorf("account number required. Usage: tcman account top-up <amount> <account-number>")
			}

			client := NewClient(config.ServerURL, "")
			ctx := context.Background()

			payment, err := client.CreatePaymentByAccountNumber(ctx, accountNumber, amount)
			if err != nil {
				return fmt.Errorf("failed to create payment: %w", err)
			}

			fmt.Printf("Bitcoin Payment Created:\n")
			fmt.Printf("  Payment ID: %d\n", payment.ID)
			fmt.Printf("  Account: %s\n", accountNumber)
			fmt.Printf("  Amount: $%.2f USD (%.8f BTC)\n", payment.USDAmount, payment.BTCAmount)
			fmt.Printf("  Address: %s\n", payment.BTCAddress)
			fmt.Printf("  Status: %s\n", strings.ToUpper(payment.Status))
			if payment.ExpiresAt != nil {
				fmt.Printf("  Expires: %s\n", payment.ExpiresAt.Format("2006-01-02 15:04:05"))
			}
			fmt.Printf("\nSend exactly %.8f BTC to the address above.\n", payment.BTCAmount)
			fmt.Printf("Your payment will be confirmed manually after Bitcoin is received.\n")

			return nil
		},
	}
}

func newAccountPaymentsCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "payments",
		Short: "List payment history",
		RunE: func(cmd *cobra.Command, args []string) error {
			config, err := LoadConfig()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			if !config.IsAuthenticated() {
				return fmt.Errorf("not logged in. Use 'tcman account login' or 'tcman account create'")
			}

			client := NewClient(config.ServerURL, config.AccessToken)
			ctx := context.Background()

			payments, err := client.GetPayments(ctx)
			if err != nil {
				return fmt.Errorf("failed to get payments: %w", err)
			}

			if len(payments) == 0 {
				fmt.Printf("No payments found.\n")
				return nil
			}

			w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
			fmt.Fprintln(w, "ID\tAmount\tBTC Amount\tStatus\tCreated\tConfirmed")
			fmt.Fprintln(w, "---\t------\t----------\t------\t-------\t---------")

			for _, payment := range payments {
				confirmedStr := "N/A"
				if payment.ConfirmedAt != nil {
					confirmedStr = payment.ConfirmedAt.Format("2006-01-02 15:04")
				}

				fmt.Fprintf(w, "%d\t$%.2f\t%.8f\t%s\t%s\t%s\n",
					payment.ID,
					payment.USDAmount,
					payment.BTCAmount,
					strings.ToUpper(payment.Status),
					payment.CreatedAt.Format("2006-01-02 15:04"),
					confirmedStr,
				)
			}
			w.Flush()

			return nil
		},
	}
}

func newAccountUsageCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "usage",
		Short: "Show billing and usage history",
		RunE: func(cmd *cobra.Command, args []string) error {
			fmt.Printf("Usage tracking is handled automatically.\n")
			fmt.Printf("You are charged monthly based on peak storage usage.\n")
			fmt.Printf("Current rate: $0.50 per GB per month.\n")
			fmt.Printf("\nUse 'tcman account info' to see your current balance.\n")
			return nil
		},
	}
}

func getAccountStatus(account *Account) string {
	if !account.IsActive {
		return "INACTIVE (needs funds)"
	}
	if account.BalanceUSD <= 0 {
		return "LOW BALANCE"
	}
	return "ACTIVE"
}