// Package racenameintents adapts the per-game capability evaluator's
// RaceNameIntents interface to the shared galaxy/notificationintent
// publisher. introduced a NoopRaceNameIntents shim while the
// notification catalog lacked the lobby.race_name.* types; lands
// those types and this adapter replaces the shim in production wiring.
package racenameintents

import (
	"context"
	"errors"
	"fmt"
	"log/slog"
	"time"

	"galaxy/lobby/internal/ports"
	"galaxy/lobby/internal/service/capabilityevaluation"
	"galaxy/notificationintent"
)

// Publisher implements capabilityevaluation.RaceNameIntents by composing
// the type-specific notificationintent constructors with the shared
// IntentPublisher port.
type Publisher struct {
	publisher ports.IntentPublisher
	clock     func() time.Time
	logger    *slog.Logger
}

// Config groups the dependencies required to construct a Publisher.
type Config struct {
	// Publisher receives every constructed notification intent. The
	// adapter never falls back to a noop; transport errors are wrapped
	// and returned so the evaluator's logging path can record them.
	Publisher ports.IntentPublisher

	// Clock supplies the wall-clock used for log timestamps. The
	// adapter copies FinishedAt from the inbound event into the intent
	// metadata, so the clock is currently unused inside Publish*; it is
	// retained on the struct for parity with other lobby adapters and
	// for forthcoming tracing hooks.
	Clock func() time.Time

	// Logger receives optional adapter-level structured logs. Defaults
	// to slog.Default() if nil.
	Logger *slog.Logger
}

// NewPublisher constructs one Publisher.
func NewPublisher(cfg Config) (*Publisher, error) {
	if cfg.Publisher == nil {
		return nil, errors.New("new race name intents publisher: nil intent publisher")
	}
	clock := cfg.Clock
	if clock == nil {
		clock = time.Now
	}
	logger := cfg.Logger
	if logger == nil {
		logger = slog.Default()
	}
	return &Publisher{
		publisher: cfg.Publisher,
		clock:     clock,
		logger:    logger.With("adapter", "lobby.racenameintents"),
	}, nil
}

// PublishEligible builds a lobby.race_name.registration_eligible intent
// from ev and forwards it to the underlying intent publisher. Idempotency
// is scoped by (game_id, user_id) so retries of the same evaluator pass
// collapse to a single notification at the consumer.
func (publisher *Publisher) PublishEligible(ctx context.Context, ev capabilityevaluation.EligibleEvent) error {
	if publisher == nil {
		return errors.New("publish race name eligible intent: nil publisher")
	}
	if ctx == nil {
		return errors.New("publish race name eligible intent: nil context")
	}
	gameID := ev.GameID.String()
	intent, err := notificationintent.NewLobbyRaceNameRegistrationEligibleIntent(
		notificationintent.Metadata{
			IdempotencyKey: "game-lobby:race-name-eligible:" + gameID + ":" + ev.UserID,
			OccurredAt:     ev.FinishedAt,
		},
		ev.UserID,
		notificationintent.LobbyRaceNameRegistrationEligiblePayload{
			GameID:          gameID,
			GameName:        ev.GameName,
			RaceName:        ev.RaceName,
			EligibleUntilMs: ev.EligibleUntil.UnixMilli(),
		},
	)
	if err != nil {
		return fmt.Errorf("publish race name eligible intent: build intent: %w", err)
	}
	if _, err := publisher.publisher.Publish(ctx, intent); err != nil {
		return fmt.Errorf("publish race name eligible intent: %w", err)
	}
	return nil
}

// PublishDenied builds a lobby.race_name.registration_denied intent from
// ev and forwards it to the underlying intent publisher.
func (publisher *Publisher) PublishDenied(ctx context.Context, ev capabilityevaluation.DeniedEvent) error {
	if publisher == nil {
		return errors.New("publish race name denied intent: nil publisher")
	}
	if ctx == nil {
		return errors.New("publish race name denied intent: nil context")
	}
	gameID := ev.GameID.String()
	intent, err := notificationintent.NewLobbyRaceNameRegistrationDeniedIntent(
		notificationintent.Metadata{
			IdempotencyKey: "game-lobby:race-name-denied:" + gameID + ":" + ev.UserID,
			OccurredAt:     ev.FinishedAt,
		},
		ev.UserID,
		notificationintent.LobbyRaceNameRegistrationDeniedPayload{
			GameID:   gameID,
			GameName: ev.GameName,
			RaceName: ev.RaceName,
			Reason:   ev.Reason,
		},
	)
	if err != nil {
		return fmt.Errorf("publish race name denied intent: build intent: %w", err)
	}
	if _, err := publisher.publisher.Publish(ctx, intent); err != nil {
		return fmt.Errorf("publish race name denied intent: %w", err)
	}
	return nil
}

// Compile-time interface assertion.
var _ capabilityevaluation.RaceNameIntents = (*Publisher)(nil)