package main

import (
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"os/exec"
	"runtime"
	"strings"

	"github.com/charmbracelet/bubbles/progress"
	"github.com/charmbracelet/bubbles/spinner"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/huh"
	"github.com/charmbracelet/lipgloss"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

func getLinuxDistribution() (string, error) {
	data, err := os.ReadFile("/etc/os-release")
	if err != nil {
		return "", err
	}

	lines := strings.Split(string(data), "\n")
	for _, line := range lines {
		if strings.HasPrefix(line, "ID=") {
			return strings.Trim(strings.TrimPrefix(line, "ID="), "\""), nil
		}
	}
	return "", fmt.Errorf("Linux distribution not found")
}

func getPackageManager(os string) (string, error) {
	switch os {
	case "debian", "ubuntu":
		return "apt", nil
	case "arch":
		return "pacman", nil
	case "fedora":
		return "dnf", nil
	default:
		return "", fmt.Errorf("no packagemanager found for os: %s", os)
	}
}

func getInstallCommand(pm string) (string, error) {
	switch pm {
	case "apt":
		return "apt install -y", nil
	case "pacman":
		return "pacman -S --noconfirm", nil
	case "dnf":
		return "dnf install -y", nil
	default:
		return "", fmt.Errorf("no install command found for package manager: %s", pm)
	}
}

func installPackage(cmd, pkg string) error {
	fullCmd := fmt.Sprintf("%s %s", cmd, pkg)
	command := exec.Command("sudo", "sh", "-c", fullCmd)
	output, err := command.CombinedOutput()
	if err != nil {
		return fmt.Errorf("failed to install %s: %v\n%s", pkg, err, string(output))
	}
	return nil
}

func downloadGolang(golangVersion string) error {
	var link string
	if runtime.GOARCH == "arm64" {
		link = "https://go.dev/dl/go" + golangVersion + ".linux-arm64.tar.gz"
	} else {
		link = "https://go.dev/dl/go" + golangVersion + ".linux-amd64.tar.gz"
	}
	resp, err := http.Get(link)
	if err != nil {
		return fmt.Errorf("Fehler beim Herunterladen von Go: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("Unerwarteter HTTP-Status: %s", resp.Status)
	}

	outFile, err := os.Create("go" + golangVersion + ".linux-" + runtime.GOARCH + ".tar.gz")
	if err != nil {
		return fmt.Errorf("Fehler beim Erstellen der Ausgabedatei: %v", err)
	}
	defer outFile.Close()

	_, err = io.Copy(outFile, resp.Body)
	if err != nil {
		return fmt.Errorf("Fehler beim Schreiben der Ausgabedatei: %v", err)
	}

	return nil
}

func installSpecialSoftware() error {
	if _, err := exec.LookPath("go"); err == nil {
		fmt.Println("Go ist bereits installiert.")
	} else {
		golangVersion := "1.23.4"
		if err := downloadGolang(golangVersion); err != nil {
			return fmt.Errorf("Fehler beim Herunterladen von Go: %v", err)
		}
		golangCommand := fmt.Sprintf("sudo rm -rf /usr/local/go && sudo tar -C /usr/local -xzf go%s.linux-%s.tar.gz", golangVersion, runtime.GOARCH)
		if err := installPackage(golangCommand, ""); err != nil {
			return err
		}
	}

	if _, err := exec.LookPath("rustc"); err == nil {
		fmt.Println("Rust ist bereits installiert.")
	} else {
		rustupCommand := "curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -- -q -y"
		if err := installPackage(rustupCommand, ""); err != nil {
			return err
		}
	}

	if _, err := exec.LookPath("pipx"); err == nil {
		fmt.Println("Pipx ist bereits installiert.")
	} else {
		pipXCommand := "python3 -m pip install --user pipx && python3 -m pipx ensurepath"
		if err := installPackage(pipXCommand, ""); err != nil {
			return err
		}
	}

	return nil
}

type model struct {
	packages []string
	index    int
	width    int
	height   int
	spinner  spinner.Model
	progress progress.Model
	done     bool
}

var (
	currentPkgNameStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("211"))
	doneStyle           = lipgloss.NewStyle().Margin(1, 2)
	checkMark           = lipgloss.NewStyle().Foreground(lipgloss.Color("42")).SetString("✓")
)

func newModel(packages []string) model {
	p := progress.New(
		progress.WithDefaultGradient(),
		progress.WithWidth(40),
		progress.WithoutPercentage(),
	)
	s := spinner.New()
	s.Style = lipgloss.NewStyle().Foreground(lipgloss.Color("63"))
	return model{
		packages: packages,
		spinner:  s,
		progress: p,
	}
}

func (m model) Init() tea.Cmd {
	return tea.Batch(installPackageCmd(m.packages[m.index]), m.spinner.Tick)
}

func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		m.width, m.height = msg.Width, msg.Height
	case tea.KeyMsg:
		switch msg.String() {
		case "ctrl+c", "esc", "q":
			return m, tea.Quit
		}
	case installedPkgMsg:
		pkg := m.packages[m.index]
		if m.index >= len(m.packages)-1 {
			m.done = true
			return m, tea.Sequence(
				tea.Printf("%s %s", checkMark, pkg),
				tea.Quit,
			)
		}

		m.index++
		progressCmd := m.progress.SetPercent(float64(m.index) / float64(len(m.packages)))

		return m, tea.Batch(
			progressCmd,
			tea.Printf("%s %s", checkMark, pkg),
			installPackageCmd(m.packages[m.index]),
		)
	case spinner.TickMsg:
		var cmd tea.Cmd
		m.spinner, cmd = m.spinner.Update(msg)
		return m, cmd
	case progress.FrameMsg:
		newModel, cmd := m.progress.Update(msg)
		if newModel, ok := newModel.(progress.Model); ok {
			m.progress = newModel
		}
		return m, cmd
	}
	return m, nil
}

func (m model) View() string {
	n := len(m.packages)
	w := lipgloss.Width(fmt.Sprintf("%d", n))

	if m.done {
		return doneStyle.Render(fmt.Sprintf("Done! Installed %d packages.\n", n))
	}

	pkgCount := fmt.Sprintf(" %*d/%*d", w, m.index, w, n)

	spin := m.spinner.View() + " "
	prog := m.progress.View()
	cellsAvail := max(0, m.width-lipgloss.Width(spin+prog+pkgCount))

	pkgName := currentPkgNameStyle.Render(m.packages[m.index])
	info := lipgloss.NewStyle().MaxWidth(cellsAvail).Render("Installing " + pkgName)

	cellsRemaining := max(0, m.width-lipgloss.Width(spin+info+prog+pkgCount))
	gap := strings.Repeat(" ", cellsRemaining)

	return spin + info + gap + prog + pkgCount
}

type installedPkgMsg string

func installPackageCmd(pkg string) tea.Cmd {
	return func() tea.Msg {
		if err := installPackage(installCommand, pkg); err != nil {
			log.Printf("Fehler beim Installieren von %s: %v", pkg, err)
		}
		return installedPkgMsg(pkg)
	}
}

func max(a, b int) int {
	if a > b {
		return a
	}
	return b
}

var rootCmd = &cobra.Command{
	Use:   "package-installer",
	Short: "Installiert Pakete basierend auf TOML-Konfiguration",
	Run:   run,
}

type Packages struct {
	Headless    []string `mapstructure:"headless"`
	NonHeadless []string `mapstructure:"non_headless"`
}

type SpecialPackages struct {
	Go    []string `mapstructure:"go"`
	Cargo []string `mapstructure:"cargo"`
	Pipx  []string `mapstructure:"pipx"`
}

type Config struct {
	Headless        bool            `mapstructure:"headless"`
	Packages        Packages        `mapstructure:"packages"`
	SpecialPackages SpecialPackages `mapstructure:"special_packages"`
}

var installCommand string

func init() {
	cobra.OnInitialize(initConfig)
	rootCmd.PersistentFlags().StringP("config", "c", "", "Pfad zur Konfigurationsdatei")
	viper.BindPFlag("config", rootCmd.PersistentFlags().Lookup("config"))
}

func initConfig() {
	if cfgFile := viper.GetString("config"); cfgFile != "" {
		viper.SetConfigFile(cfgFile)
	} else {
		viper.SetConfigName("config")
		viper.AddConfigPath(".")
	}

	if err := viper.ReadInConfig(); err != nil {
		fmt.Println("Fehler beim Lesen der Konfigurationsdatei:", err)
		os.Exit(1)
	}
}

func installSpecialPackages(sp SpecialPackages) error {
	for _, pkg := range sp.Go {
		cmd := exec.Command("go", "install", pkg+"@latest")
		if err := cmd.Run(); err != nil {
			return fmt.Errorf("Fehler bei der Installation von %s: %v", pkg, err)
		}
	}

	for _, pkg := range sp.Cargo {
		cmd := exec.Command("cargo", "install", pkg)
		if err := cmd.Run(); err != nil {
			return fmt.Errorf("Fehler bei der Installation von %s: %v", pkg, err)
		}
	}

	for _, pkg := range sp.Pipx {
		cmd := exec.Command("pipx", "install", pkg)
		if err := cmd.Run(); err != nil {
			return fmt.Errorf("Fehler bei der Installation von %s: %v", pkg, err)
		}
	}

	return nil
}

func run(cmd *cobra.Command, args []string) {
	os, err := getLinuxDistribution()
	if err != nil {
		log.Fatal(err)
	}
	pm, err := getPackageManager(os)
	if err != nil {
		log.Fatal(err)
	}
	installCommand, err = getInstallCommand(pm)
	if err != nil {
		log.Fatal(err)
	}

	var cfg Config
	if err := viper.Unmarshal(&cfg); err != nil {
		log.Fatalf("Fehler beim Lesen der Konfiguration: %v", err)
	}

	form := huh.NewForm(
		huh.NewGroup(
			huh.NewConfirm().
				Title("Möchten Sie eine headless Installation durchführen?").
				Value(&cfg.Headless),
		),
	).WithTheme(huh.ThemeCatppuccin())

	if err := form.Run(); err != nil {
		log.Fatalf("Fehler bei der Benutzerabfrage: %v", err)
	}

	var packages []string
	packages = append(packages, cfg.Packages.Headless...)
	if !cfg.Headless {
		packages = append(packages, cfg.Packages.NonHeadless...)
	}

	m := newModel(packages)
	p := tea.NewProgram(m)
	if _, err := p.Run(); err != nil {
		log.Fatal(err)
	}

	var installSpecial bool
	form = huh.NewForm(
		huh.NewGroup(
			huh.NewConfirm().
				Title("Möchten Sie die speziellen Pakete (Go, Rust, Pipx) installieren?").
				Value(&installSpecial),
		),
	).WithTheme(huh.ThemeCatppuccin())

	err = form.Run()
	if err != nil {
		log.Fatal(err)
	}

	if installSpecial {
		if err := installSpecialSoftware(); err != nil {
			log.Printf("Fehler beim Installieren der speziellen Software: %v", err)
		} else {
			fmt.Println("Spezielle Software erfolgreich installiert")
		}
	} else {
		fmt.Println("Installation der speziellen Pakete übersprungen")
	}

	if err := installSpecialPackages(cfg.SpecialPackages); err != nil {
		log.Printf("Fehler bei der Installation spezieller Pakete: %v", err)
	}
}

func main() {
	if err := rootCmd.Execute(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}