package config

import (
	"fmt"
	"log/slog"
	"net"
	"net/url"
	"strings"
)

// Validate reports whether cfg stores a usable Runtime Manager process
// configuration.
func (cfg Config) Validate() error {
	if cfg.ShutdownTimeout <= 0 {
		return fmt.Errorf("%s must be positive", shutdownTimeoutEnvVar)
	}
	if err := validateSlogLevel(cfg.Logging.Level); err != nil {
		return fmt.Errorf("%s: %w", logLevelEnvVar, err)
	}
	if err := cfg.InternalHTTP.Validate(); err != nil {
		return err
	}
	if err := cfg.Docker.Validate(); err != nil {
		return err
	}
	if err := cfg.Postgres.Validate(); err != nil {
		return err
	}
	if err := cfg.Redis.Validate(); err != nil {
		return err
	}
	if err := cfg.Streams.Validate(); err != nil {
		return err
	}
	if err := cfg.Container.Validate(); err != nil {
		return err
	}
	if err := cfg.Health.Validate(); err != nil {
		return err
	}
	if err := cfg.Cleanup.Validate(); err != nil {
		return err
	}
	if err := cfg.Coordination.Validate(); err != nil {
		return err
	}
	if err := cfg.Lobby.Validate(); err != nil {
		return err
	}
	if err := cfg.Telemetry.Validate(); err != nil {
		return err
	}

	return nil
}

func validateSlogLevel(level string) error {
	var slogLevel slog.Level
	if err := slogLevel.UnmarshalText([]byte(strings.TrimSpace(level))); err != nil {
		return fmt.Errorf("invalid slog level %q: %w", level, err)
	}

	return nil
}

func isTCPAddr(value string) bool {
	host, port, err := net.SplitHostPort(strings.TrimSpace(value))
	if err != nil {
		return false
	}

	if port == "" {
		return false
	}
	if host == "" {
		return true
	}

	return !strings.Contains(host, " ")
}

func isHTTPURL(value string) bool {
	parsed, err := url.Parse(strings.TrimSpace(value))
	if err != nil {
		return false
	}

	if parsed.Scheme != "http" && parsed.Scheme != "https" {
		return false
	}

	return parsed.Host != ""
}