package main

import (
	"crypto/rand"
	"database/sql"
	"encoding/hex"
	"fmt"
	"log"
	"os"
	"strings"
	"time"

	_ "github.com/mattn/go-sqlite3"
	"github.com/oklog/ulid/v2"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var (
	tokenUsername string
	tokenDuration int64
)

var tokenCmd = &cobra.Command{
	Use:   "token",
	Short: "Manage tokens",
	Long:  `Commands for managing authentication tokens in the MCIAS system.`,
}

var addTokenCmd = &cobra.Command{
	Use:   "add",
	Short: "Add a new token for a user",
	Long: `Add a new authentication token for a user in the MCIAS system.
This command requires a username and optionally a duration in hours.`,
	Run: func(cmd *cobra.Command, args []string) {
		addToken()
	},
}

var listTokensCmd = &cobra.Command{
	Use:   "list",
	Short: "List all tokens",
	Long:  `List all authentication tokens in the MCIAS system.`,
	Run: func(cmd *cobra.Command, args []string) {
		listTokens()
	},
}

func init() {
	rootCmd.AddCommand(tokenCmd)
	tokenCmd.AddCommand(addTokenCmd)
	tokenCmd.AddCommand(listTokensCmd)

	addTokenCmd.Flags().StringVarP(&tokenUsername, "username", "u", "", "Username to create token for")
	addTokenCmd.Flags().Int64VarP(&tokenDuration, "duration", "d", 24, "Token duration in hours (default 24)")
	if err := addTokenCmd.MarkFlagRequired("username"); err != nil {
		fmt.Fprintf(os.Stderr, "Error marking username flag as required: %v\n", err)
	}
}

func addToken() {
	dbPath := viper.GetString("db")

	logger := log.New(os.Stdout, "MCIAS: ", log.LstdFlags)

	db, err := sql.Open("sqlite3", dbPath)
	if err != nil {
		logger.Fatalf("Failed to open database: %v", err)
	}
	defer db.Close()

	var userID string
	err = db.QueryRow("SELECT id FROM users WHERE user = ?", tokenUsername).Scan(&userID)
	if err != nil {
		if err == sql.ErrNoRows {
			logger.Fatalf("User %s does not exist", tokenUsername)
		}
		logger.Fatalf("Failed to check if user exists: %v", err)
	}

	// Generate 16 bytes of random data
	tokenBytes := make([]byte, 16)
	if _, err := rand.Read(tokenBytes); err != nil {
		logger.Fatalf("Failed to generate random token: %v", err)
	}

	// Hex encode the random bytes to get a 32-character string
	token := hex.EncodeToString(tokenBytes)

	expires := time.Now().Add(time.Duration(tokenDuration) * time.Hour).Unix()

	query := `INSERT INTO tokens (id, uid, token, expires) VALUES (?, ?, ?, ?)`
	tokenID := ulid.Make().String()
	_, err = db.Exec(query, tokenID, userID, token, expires)
	if err != nil {
		logger.Fatalf("Failed to insert token into database: %v", err)
	}

	expiresTime := time.Unix(expires, 0).Format(time.RFC3339)

	fmt.Printf("Token created successfully for user %s\n", tokenUsername)
	fmt.Printf("Token: %s\n", token)
	fmt.Printf("Expires: %s\n", expiresTime)
}

func listTokens() {
	dbPath := viper.GetString("db")

	logger := log.New(os.Stdout, "MCIAS: ", log.LstdFlags)

	db, err := sql.Open("sqlite3", dbPath)
	if err != nil {
		logger.Fatalf("Failed to open database: %v", err)
	}
	defer db.Close()

	query := `
		SELECT t.id, t.token, t.expires, u.user
		FROM tokens t
		JOIN users u ON t.uid = u.id
		ORDER BY t.expires DESC
	`
	rows, err := db.Query(query)
	if err != nil {
		logger.Fatalf("Failed to query tokens: %v", err)
	}
	defer rows.Close()

	fmt.Printf("%-24s %-30s %-20s %-20s %-10s\n", "ID", "TOKEN", "USERNAME", "EXPIRES", "STATUS")
	fmt.Println(strings.Repeat("-", 100))

	now := time.Now().Unix()
	for rows.Next() {
		var id, token, username string
		var expires int64
		if err := rows.Scan(&id, &token, &expires, &username); err != nil {
			logger.Fatalf("Failed to scan token row: %v", err)
		}

		expiresTime := time.Unix(expires, 0).Format(time.RFC3339)

		status := "ACTIVE"
		if expires > 0 && expires < now {
			status = "EXPIRED"
		}

		fmt.Printf("%-24s %-30s %-20s %-20s %-10s\n", id, token, username, expiresTime, status)
	}

	if err := rows.Err(); err != nil {
		logger.Fatalf("Error iterating token rows: %v", err)
	}
}