package main

import (
	"flag"
	"fmt"
	"os"
	"strings"

	"go.jolheiser.com/eget/disk"
	"go.jolheiser.com/eget/forge"
	"go.jolheiser.com/eget/meta"
	"go.jolheiser.com/eget/shell"
)

var Version = "develop"

func main() {
	fs := flag.NewFlagSet("eget", flag.ExitOnError)
	fs.Usage = func() {
		fmt.Fprintln(fs.Output(), "eget <package>")
		fs.PrintDefaults()
	}
	updateFlag := fs.Bool("update", false, "Update package")
	fs.BoolVar(updateFlag, "u", *updateFlag, "--update")
	deleteFlag := flag.Bool("delete", false, "Delete package")
	fs.BoolVar(deleteFlag, "d", *deleteFlag, "--delete")
	nuFlag := fs.Bool("nu", false, "Write out Nu environment")
	if err := fs.Parse(os.Args[1:]); err != nil {
		fs.Usage()
		return
	}

	if *nuFlag {
		nu, err := shell.Nu()
		if err != nil {
			panic(err)
		}
		fmt.Println(nu)
		return
	}

	if fs.NArg() < 1 {
		fs.Usage()
		return
	}

	var f forge.Forger
	var err error
	uri := fs.Arg(0)

	f, err = forge.NewGitea(uri)
	if strings.HasPrefix(uri, "github") {
		f, err = forge.NewGitHub(uri)
	}
	if err != nil {
		panic(err)
	}

	name := uriName(uri)
	if *deleteFlag {
		if err := os.RemoveAll(disk.Path(name)); err != nil {
			panic(err)
		}
		if err := meta.Remove(name); err != nil {
			panic(err)
		}
		fmt.Printf("removed %q\n", name)
		return
	}

	asset, err := forge.Latest(f)
	if err != nil {
		panic(err)
	}

	if *updateFlag {
		m, err := meta.Read()
		if err != nil {
			panic(err)
		}
		if strings.EqualFold(asset.Name, m.Packages[name]) {
			fmt.Printf("%q is up-to-date\n", name)
			return
		}
		if err := os.RemoveAll(disk.Path(name)); err != nil {
			panic(err)
		}
	}

	if err := disk.Install(name, asset); err != nil {
		panic(err)
	}

	if err := meta.Upsert(name, asset.Name); err != nil {
		panic(err)
	}

	verb := "installed"
	if *updateFlag {
		verb = "updated"
	}
	fmt.Printf("%s %q\n", verb, uri)
}

func uriName(uri string) string {
	parts := strings.FieldsFunc(uri, func(r rune) bool { return r == '/' })
	return parts[len(parts)-1]
}