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package main

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

	"go.jolheiser.com/go-spectre"
)

func main() {
	pw, err := maine(os.Args[1:])
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println(pw)
}

func maine(args []string) (string, error) {
	fs := flag.NewFlagSet("spectre", flag.ExitOnError)
	fs.Usage = func() {
		fmt.Fprintln(fs.Output(), "spectre [FLAGS] [site]")
		fs.PrintDefaults()
	}
	usernameFlag := fs.String("username", "", "username")
	fs.StringVar(usernameFlag, "u", *usernameFlag, "--username")
	secretFlag := fs.String("secret", "", "secret")
	fs.StringVar(secretFlag, "s", *secretFlag, "--secret")
	secretFileFlag := fs.String("secret-file", "", "Path to a file containing --secret")
	fs.StringVar(secretFileFlag, "f", *secretFileFlag, "--secret-file")
	counterFlag := fs.Int("counter", 1, "counter")
	fs.IntVar(counterFlag, "c", *counterFlag, "--counter")
	baseFlag := fs.String("base", "com.lyndir.masterpassword", "scoper base")
	fs.StringVar(baseFlag, "b", *baseFlag, "--base")
	scopeFlag := spectre.Authentication
	scopeFn := func(s string) (err error) {
		scopeFlag, err = spectre.ParseScope(s)
		return
	}
	fs.Func("scope", "scope [authentication, identification, recovery]", scopeFn)
	fs.Func("S", "--scope", scopeFn)
	var templateFlag spectre.Template
	templateFn := func(s string) (err error) {
		templateFlag, err = spectre.ParseTemplate(s)
		return
	}
	fs.Func("template", "template [maximum, long, medium, short, pin, name, phrase, basic]", templateFn)
	fs.Func("t", "--template", templateFn)

	if err := fs.Parse(args); err != nil {
		return "", err
	}
	if err := checkEnv(fs); err != nil {
		return "", err
	}

	if templateFlag == "" {
		templateFlag = scopeFlag.DefaultTemplate()
	}

	if *secretFileFlag != "" {
		secret, err := os.ReadFile(*secretFileFlag)
		if err != nil {
			return "", err
		}
		*secretFlag = strings.TrimSpace(string(secret))
	}

	if *usernameFlag == "" || *secretFlag == "" || fs.NArg() < 1 {
		return "", requiredArgs{
			missingUsername: *usernameFlag == "",
			missingSecret:   *secretFlag == "",
			missingSite:     fs.NArg() < 1,
		}
	}

	s, err := spectre.New(*usernameFlag, *secretFlag, spectre.WithScoper(spectre.SimpleScoper{
		Key: *baseFlag,
	}))
	if err != nil {
		return "", err
	}

	return s.Site(fs.Arg(0),
		spectre.WithScope(scopeFlag),
		spectre.WithTemplate(templateFlag),
		spectre.WithCounter(*counterFlag),
	), nil
}

type requiredArgs struct {
	missingUsername bool
	missingSecret   bool
	missingSite     bool
}

func (r requiredArgs) Error() string {
	s := "--username, --secret, and <site-name> are required, missing: "
	if r.missingUsername {
		s += "\n- username"
	}
	if r.missingSecret {
		s += "\n- secret"
	}
	if r.missingSite {
		s += "\n- site name"
	}
	return s
}

func checkEnv(fs *flag.FlagSet) error {
	provided := map[string]struct{}{}
	fs.Visit(func(f *flag.Flag) {
		provided[f.Name] = struct{}{}
	})
	var visitErr error
	fs.VisitAll(func(f *flag.Flag) {
		if visitErr != nil {
			return
		}
		if _, ok := provided[f.Name]; ok {
			return
		}
		env := os.Getenv(fmt.Sprintf("SPECTRE_%s", strings.ToUpper(f.Name)))
		if env == "" {
			return
		}
		if err := fs.Set(f.Name, env); err != nil {
			visitErr = fmt.Errorf("could not set flag %q to %q", f.Name, env)
		}
	})
	return nil
}