package cmd

import (
	"fmt"
	"io"
	"io/fs"
	"net/url"
	"os"
	"strings"

	"github.com/Snider/Borg/pkg/compress"
	"github.com/Snider/Borg/pkg/datanode"
	"github.com/Snider/Borg/pkg/github"
	"github.com/Snider/Borg/pkg/matrix"
	"github.com/Snider/Borg/pkg/ui"
	"github.com/Snider/Borg/pkg/vcs"
	"github.com/spf13/cobra"
)

// allCmd represents the all command
var allCmd = &cobra.Command{
	Use:   "all [url]",
	Short: "Collect all resources from a URL",
	Long:  `Collect all resources from a URL, dispatching to the appropriate collector based on the URL type.`,
	Args:  cobra.ExactArgs(1),
	RunE: func(cmd *cobra.Command, args []string) error {
		url := args[0]
		outputFile, _ := cmd.Flags().GetString("output")
		format, _ := cmd.Flags().GetString("format")
		compression, _ := cmd.Flags().GetString("compression")

		owner, err := parseGithubOwner(url)
		if err != nil {
			return err
		}

		repos, err := GithubClient.GetPublicRepos(cmd.Context(), owner)
		if err != nil {
			return err
		}

		prompter := ui.NewNonInteractivePrompter(ui.GetVCSQuote)
		prompter.Start()
		defer prompter.Stop()

		var progressWriter io.Writer
		if prompter.IsInteractive() {
			bar := ui.NewProgressBar(len(repos), "Cloning repositories")
			progressWriter = ui.NewProgressWriter(bar)
		}

		cloner := vcs.NewGitCloner()
		allDataNodes := datanode.New()

		for _, repoURL := range repos {
			dn, err := cloner.CloneGitRepository(repoURL, progressWriter)
			if err != nil {
				// Log the error and continue
				fmt.Fprintln(cmd.ErrOrStderr(), "Error cloning repository:", err)
				continue
			}
			// This is not an efficient way to merge datanodes, but it's the only way for now
			// A better approach would be to add a Merge method to the DataNode
			repoName := strings.TrimSuffix(repoURL, ".git")
			parts := strings.Split(repoName, "/")
			repoName = parts[len(parts)-1]

			err = dn.Walk(".", func(path string, de fs.DirEntry, err error) error {
				if err != nil {
					return err
				}
				if !de.IsDir() {
					err := func() error {
						file, err := dn.Open(path)
						if err != nil {
							return err
						}
						defer file.Close()
						data, err := io.ReadAll(file)
						if err != nil {
							return err
						}
						allDataNodes.AddData(repoName+"/"+path, data)
						return nil
					}()
					if err != nil {
						return err
					}
				}
				return nil
			})
			if err != nil {
				fmt.Fprintln(cmd.ErrOrStderr(), "Error walking datanode:", err)
				continue
			}
		}

		var data []byte
		if format == "matrix" {
			matrix, err := matrix.FromDataNode(allDataNodes)
			if err != nil {
				return fmt.Errorf("error creating matrix: %w", err)
			}
			data, err = matrix.ToTar()
			if err != nil {
				return fmt.Errorf("error serializing matrix: %w", err)
			}
		} else {
			data, err = allDataNodes.ToTar()
			if err != nil {
				return fmt.Errorf("error serializing DataNode: %w", err)
			}
		}

		compressedData, err := compress.Compress(data, compression)
		if err != nil {
			return fmt.Errorf("error compressing data: %w", err)
		}

		err = os.WriteFile(outputFile, compressedData, 0644)
		if err != nil {
			return fmt.Errorf("error writing DataNode to file: %w", err)
		}

		fmt.Fprintln(cmd.OutOrStdout(), "All repositories saved to", outputFile)

		return nil
	},
}

func init() {
	RootCmd.AddCommand(allCmd)
	allCmd.PersistentFlags().String("output", "all.dat", "Output file for the DataNode")
	allCmd.PersistentFlags().String("format", "datanode", "Output format (datanode or matrix)")
	allCmd.PersistentFlags().String("compression", "none", "Compression format (none, gz, or xz)")
}

func parseGithubOwner(u string) (string, error) {
	owner, _, err := github.ParseRepoFromURL(u)
	if err == nil {
		return owner, nil
	}

	parsedURL, err := url.Parse(u)
	if err != nil {
		return "", fmt.Errorf("invalid URL: %w", err)
	}

	path := strings.Trim(parsedURL.Path, "/")
	parts := strings.Split(path, "/")
	if len(parts) != 1 {
		return "", fmt.Errorf("invalid owner URL: %s", u)
	}
	return parts[0], nil
}