package main

import (
	"fmt"
	"os"
	"strings"

	tea "github.com/charmbracelet/bubbletea"
)

const version = "0.1.0"

func main() {
	// Parse command line arguments
	rootPath := "."
	themeOverride := ""

	for i := 1; i < len(os.Args); i++ {
		arg := os.Args[i]
		switch {
		case arg == "-h" || arg == "--help":
			printHelp()
			os.Exit(0)
		case arg == "-v" || arg == "--version":
			fmt.Printf("reader v%s\n", version)
			os.Exit(0)
		case arg == "--light":
			themeOverride = "light"
		case arg == "--dark":
			themeOverride = "dark"
		case strings.HasPrefix(arg, "--theme="):
			themeOverride = strings.TrimPrefix(arg, "--theme=")
		case arg == "--save-theme":
			// Save current detected theme
			theme := DetectTheme()
			if err := SaveThemePreference(theme.Name); err != nil {
				fmt.Fprintf(os.Stderr, "Error saving theme: %v\n", err)
				os.Exit(1)
			}
			fmt.Printf("Saved theme preference: %s\n", theme.Name)
			os.Exit(0)
		case !strings.HasPrefix(arg, "-"):
			rootPath = arg
		}
	}

	// Detect or set theme
	var theme Theme
	switch themeOverride {
	case "light":
		theme = LightTheme
	case "dark":
		theme = DarkTheme
	default:
		theme = DetectTheme()
	}
	SetTheme(theme)

	// Verify path exists
	info, err := os.Stat(rootPath)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
		os.Exit(1)
	}

	// If it's a file, use its parent directory
	if !info.IsDir() {
		rootPath = "."
	}

	// Create and run the program
	p := tea.NewProgram(
		NewModel(rootPath),
		tea.WithAltScreen(),
		tea.WithMouseCellMotion(),
	)

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

func printHelp() {
	help := `reader - A beautiful terminal file browser & markdown viewer

Usage:
  reader [path]     Open at path (default: current directory)
  reader --light    Force light theme
  reader --dark     Force dark theme
  reader --save-theme  Save detected theme as default

Options:
  -h, --help       Show this help
  -v, --version    Show version
  --light          Use light theme
  --dark           Use dark theme
  --save-theme     Detect and save theme preference

Keys:
  ↑/↓              Navigate / scroll
  Enter            Open file or folder
  ←/→              Collapse/expand folders
  Esc              Back to file browser
  ?                Show help
  q                Quit

Theme is auto-detected from your terminal. Override with flags
or save a preference with --save-theme.

Config: ~/.config/reader/theme`

	fmt.Println(help)
}