package routing

import (
	"fmt"
	"net/url"
)

// Upstreams holds the base URL for each backend service.
type Upstreams struct {
	GameSession  string
	QuestionBank string
	User         string
	Leaderboard  string
	Admin        string
}

// Validate ensures all upstream URLs are present and valid absolute URLs.
func (u Upstreams) Validate() error {
	checks := map[string]string{
		"game-session":  u.GameSession,
		"question-bank": u.QuestionBank,
		"user":          u.User,
		"leaderboard":   u.Leaderboard,
		"admin":         u.Admin,
	}

	for name, raw := range checks {
		if raw == "" {
			return fmt.Errorf("%s upstream URL is required", name)
		}
		parsed, err := url.Parse(raw)
		if err != nil {
			return fmt.Errorf("invalid %s upstream URL: %w", name, err)
		}
		if parsed.Scheme == "" || parsed.Host == "" {
			return fmt.Errorf("invalid %s upstream URL: must include scheme and host", name)
		}
	}

	return nil
}