package cli

import (
	"bufio"
	"fmt"
	"os"
	"strings"

	"golang.org/x/term"

	"git.morlana.online/f.weber/vault-tui/internal/auth"
)

// promptMissing fills in any of m's still-missing required fields by
// prompting on the controlling TTY. It never blocks when stdin is not a
// terminal (e.g. CI/pipes) — callers should check IsInteractive first and
// treat a non-empty Missing() list as a hard error in that case instead of
// calling this.
func promptMissing(m auth.Method, creds auth.Credentials) error {
	missing := auth.Missing(m, creds)
	if len(missing) == 0 {
		return nil
	}
	reader := bufio.NewReader(os.Stdin)
	for _, f := range missing {
		if f.Kind == auth.FieldSecret {
			v, err := readPassword(f.Label)
			if err != nil {
				return err
			}
			creds[f.Name] = v
			continue
		}
		fmt.Fprintf(os.Stderr, "%s: ", f.Label)
		line, err := reader.ReadString('\n')
		if err != nil {
			return fmt.Errorf("reading %s: %w", f.Label, err)
		}
		creds[f.Name] = strings.TrimSpace(line)
	}
	return nil
}

func readPassword(label string) (string, error) {
	fmt.Fprintf(os.Stderr, "%s (will be hidden): ", label)
	b, err := term.ReadPassword(int(os.Stdin.Fd()))
	fmt.Fprintln(os.Stderr)
	if err != nil {
		return "", fmt.Errorf("reading %s: %w", label, err)
	}
	return strings.TrimSpace(string(b)), nil
}

// IsInteractive reports whether stdin is a terminal we can prompt on.
func IsInteractive() bool {
	return term.IsTerminal(int(os.Stdin.Fd()))
}