domain

type HandlerParams struct {
	Recorder  Recorder
	Messages  MessageChecker
	Decorator MessageDecorator
	Logger    *slog.Logger
	Now       func() time.Time
}

type MessageChecker interface {
	HasMessages(ctx context.Context, repository string, prNumber int) (bool, error)
}

type MessageDecorator interface {
	AppendReviewingMarker(ctx context.Context, message MessageRef, reviewer Reviewer, since time.Time) error
}

type MessageRef struct {
	Channel   string
	TS        string
	RawBlocks json.RawMessage
	Fallback  string
}

type Recorder interface {
	// HasActiveReview reports whether the user already has an in-progress review
	// on the PR (a repeat click is a no-op).
	HasActiveReview(ctx context.Context, repository string, prNumber int, userID string) (bool, error)
	// Start records the user as a reviewer. It returns ErrActiveReviewExists when
	// a concurrent click already recorded them.
	Start(ctx context.Context, repository string, prNumber int, userID, userName string) error
}

type Reviewer struct {
	UserID   string
	UserName string
}

type StartReview interface {
	Handle(ctx context.Context, command StartReviewCommand) error
}

type StartReviewCommand struct {
	Repository string
	PRNumber   int
	Reviewer   Reviewer
	Message    MessageRef
}