package main

import (
	"context"
	"flag"
	"fmt"
	"go.unistack.org/unistack-org/pkgdash/internal"
	"io"
	"net/url"
	"os"
	"sort"
	"strings"

	"github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing/filemode"
	"github.com/go-git/go-git/v5/plumbing/object"
	"github.com/go-git/go-git/v5/storage/memory"
	flagconfig "go.unistack.org/micro-config-flag/v4"
	"go.unistack.org/micro/v4/config"
	"go.unistack.org/micro/v4/logger"
	"golang.org/x/mod/modfile"
	"golang.org/x/mod/module"
)

type Config struct {
	Action        string `flag:"name=action,desc='action to run',default='add'"`
	Url           string `flag:"name=url,desc='url or repo',default=''"`
	CheckInterval string `default:"*/10 * * * *"`
}

func main() {
	var err error

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	cfg := &Config{}

	if err = config.Load(ctx, []config.Config{
		config.NewConfig(config.Struct(cfg)),
		flagconfig.NewConfig(config.Struct(cfg)),
	}); err != nil {
		logger.Fatal(ctx, err)
	}

	flagUrl := flag.Arg(0)

	u, err := url.Parse(flagUrl)
	if err != nil {
		logger.Fatal(ctx, err)
	}

	var rev string
	if idx := strings.Index(u.Path, "@"); idx > 0 {
		rev = u.Path[idx+1:]
	}

	cloneOpts := &git.CloneOptions{
		URL:      flagUrl,
		Progress: os.Stdout,
	}

	if len(rev) == 0 {
		cloneOpts.SingleBranch = true
		cloneOpts.Depth = 1
	}

	if err := cloneOpts.Validate(); err != nil {
		logger.Fatal(ctx, err)
	}

	repo, err := git.CloneContext(ctx, memory.NewStorage(), nil, cloneOpts)
	if err != nil {
		logger.Fatal(ctx, err)
	}

	ref, err := repo.Head()
	if err != nil {
		logger.Fatalf(ctx, "failed to get head: %v", err)
	}

	commit, err := repo.CommitObject(ref.Hash())
	if err != nil {
		logger.Fatalf(ctx, "failed to get commit: %v", err)
	}

	tree, err := commit.Tree()
	if err != nil {
		logger.Fatal(ctx, err)
	}

	err = tree.Files().ForEach(func(file *object.File) error {
		if file == nil {
			return fmt.Errorf("file pointer is nil")
		}

		switch file.Mode {
		case filemode.Regular:
			if strings.HasSuffix(file.Name, "go.mod") {
				mvs, err := Direct(file)
				if err != nil {
					return err
				}
				internal.Updates(internal.UpdateOptions{
					Pre:     false,
					Major:   false,
					Cached:  false,
					Modules: mvs,
					OnUpdate: func(u internal.Update) {
						if u.Err != nil {
							fmt.Fprintf(os.Stderr, "%s: failed: %v\n", u.Module.Path, u.Err)
						} else {
							fmt.Printf("%s current:%s => latest:%v\n", u.Module.Path, u.Module.Version, u.Version)
						}
					},
				})
			}
			return nil
		default:
			return nil
		}
	})

	if err != nil {
		logger.Fatal(ctx, "failed to exctract file: %v", err)
	}
}

func Direct(file *object.File) ([]module.Version, error) {
	r, err := file.Reader()
	if err != nil {
		return nil, err
	}
	defer r.Close()
	data, err := io.ReadAll(r)
	if err != nil {
		return nil, err
	}
	modfile, err := modfile.ParseLax("go.mod", data, nil)
	if err != nil {
		return nil, err
	}
	var mods []module.Version
	for _, req := range modfile.Require {
		// if !req.Indirect {
		mods = append(mods, req.Mod)
		//}
	}
	sort.Slice(mods, func(i, j int) bool {
		return mods[i].Path < mods[j].Path
	})
	return mods, nil
}

/*
func Periodic(ctx context.Context, db *sqlx.DB) error {

	db.
	return nil
}


*/