package zoopb

import (
	"bufio"
	"fmt"
	"os/exec"
	"strings"

	"go.wit.com/log"
)

// getPackageList returns the list of installed packages based on the distro
func getPackageList(distro string) (map[string]string, error) {
	var cmd *exec.Cmd

	// Run the appropriate command based on the detected distribution
	switch distro {
	case "ubuntu", "debian":
		return dpkgQuery()
	case "fedora", "centos", "rhel":
		cmd = exec.Command("rpm", "-qa")
	case "arch", "manjaro":
		cmd = exec.Command("pacman", "-Q")
	default:
		return nil, fmt.Errorf("unsupported distribution: %s", distro)
	}

	// Capture the command's output
	output, err := cmd.CombinedOutput()
	if err != nil {
		return nil, fmt.Errorf("error running command: %v", err)
	}

	// todo: Split the output into lines and return
	lines := strings.Split(string(output), "\n")
	log.Info("output had", len(lines), "lines")
	return nil, nil
}

func dpkgQuery() (map[string]string, error) {
	// Run the dpkg-query command to list installed packages and versions
	cmd := exec.Command("dpkg-query", "-W", "-f=${Package} ${Version}\n")
	stdout, err := cmd.StdoutPipe()
	if err != nil {
		return nil, err
	}

	// Start the command execution
	if err := cmd.Start(); err != nil {
		return nil, err
	}
	defer cmd.Wait()

	// Create a map to store package names and versions
	installedPackages := make(map[string]string)

	// Use a scanner to read the output of the command line by line
	scanner := bufio.NewScanner(stdout)
	for scanner.Scan() {
		line := scanner.Text()
		// Split each line into package name and version
		parts := strings.SplitN(line, " ", 2)
		if len(parts) == 2 {
			packageName := parts[0]
			version := parts[1]
			installedPackages[packageName] = version
		}
	}

	// Return the map with package names and versions
	return installedPackages, scanner.Err()
}