/*
Copyright © 2025 maxtheweb
*/
package cmd

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"

	"github.com/spf13/cobra"
)

// loginCmd represents the login command
var loginCmd = &cobra.Command{
	Use:   "login",
	Short: "Set up your X API credentials easily",
	Long: `Opens your editor to configure your X API credentials.

The configuration will be saved to ~/.config/xapi/config.toml
Get your credentials from: https://developer.x.com/en/portal/dashboard

You'll need:
  - OAuth 1.0a credentials (Consumer Key/Secret, Access Token/Secret)
  - OAuth 2.0 credentials (Client ID/Secret - optional, for future features)

Usage:
  xapi login  # Edit credentials in your editor`,
	Run: func(cmd *cobra.Command, args []string) {
		runLogin()
	},
}

func init() {
	rootCmd.AddCommand(loginCmd)
}

// findEditor searches for an available text editor
func findEditor() string {
	// First, check if EDITOR is set
	if editor := os.Getenv("EDITOR"); editor != "" {
		// Verify it exists
		if _, err := exec.LookPath(editor); err == nil {
			return editor
		}
	}

	// Check for VISUAL (some systems use this)
	if visual := os.Getenv("VISUAL"); visual != "" {
		if _, err := exec.LookPath(visual); err == nil {
			return visual
		}
	}

	// Try common editors in order of preference
	editors := []string{
		"nvim",    // Neovim (power users)
		"vim",     // Vim (widely available)
		"vi",      // Vi (almost always there)
		"nano",    // Nano (beginner-friendly)
		"emacs",   // Emacs (for the enlightened)
		"micro",   // Micro (modern terminal editor)
		"code",    // VS Code (if they have it in terminal)
		"subl",    // Sublime Text
		"gedit",   // GNOME editor
		"kate",    // KDE editor
	}

	for _, editor := range editors {
		if _, err := exec.LookPath(editor); err == nil {
			return editor
		}
	}

	return "" // No editor found
}

func runLogin() {
	// Get config directory
	homeDir, err := os.UserHomeDir()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error getting home directory: %v\n", err)
		os.Exit(1)
	}

	configDir := filepath.Join(homeDir, ".config", "xapi")
	configFile := filepath.Join(configDir, "config.toml")

	// Create config directory if it doesn't exist
	if err := os.MkdirAll(configDir, 0755); err != nil {
		fmt.Fprintf(os.Stderr, "Error creating config directory: %v\n", err)
		os.Exit(1)
	}

	// Check if config file exists, if not create template
	if _, err := os.Stat(configFile); os.IsNotExist(err) {
		template := `# X API Configuration
# Get your credentials from: https://developer.x.com/en/portal/dashboard
#
# SECURITY NOTE: Never share this file or commit it to version control!

# OAuth 1.0a Credentials (required for posting and searching)
[oauth]
consumer_key = ""
consumer_secret = ""
access_token = ""
access_token_secret = ""

# OAuth 2.0 Credentials (optional, for future features)
[oauth2]
client_id = ""
client_secret = ""
`
		if err := os.WriteFile(configFile, []byte(template), 0600); err != nil {
			fmt.Fprintf(os.Stderr, "Error creating config file: %v\n", err)
			os.Exit(1)
		}
	}

	// Get editor using smart detection
	editor := findEditor()
	if editor == "" {
		fmt.Fprintf(os.Stderr, "Error: No text editor found!\n\n")
		fmt.Println("Please install one of: nvim, vim, vi, nano, emacs")
		fmt.Println("Or set your preferred editor: export EDITOR=nvim")
		os.Exit(1)
	}

	// Open editor
	fmt.Printf("Opening %s with %s...\n", configFile, editor)
	cmd := exec.Command(editor, configFile)
	cmd.Stdin = os.Stdin
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	if err := cmd.Run(); err != nil {
		fmt.Fprintf(os.Stderr, "Error opening editor: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("\nCredentials saved!")
	fmt.Println("\nNext step:")
	fmt.Println("  xapi status  # Test your authentication")
	fmt.Println("\nThen you can use:")
	fmt.Println("  xapi search  # Search tweets")
	fmt.Println("  xapi create  # Create posts")
}