package health

import (
	"context"
	"fmt"
)

// Checker allows plugging external dependency checks into readiness.
type Checker interface {
	Name() string
	Check(ctx context.Context) error
}

// ReadinessUsecase executes dependency checks used by /readyz.
type ReadinessUsecase struct {
	checkers []Checker
}

func NewReadinessUsecase(checkers []Checker) *ReadinessUsecase {
	return &ReadinessUsecase{checkers: checkers}
}

func (u *ReadinessUsecase) Check(ctx context.Context) error {
	// TODO: add concrete dependency checkers (DB, cache, third-party APIs) as needed.
	for _, checker := range u.checkers {
		if err := checker.Check(ctx); err != nil {
			return fmt.Errorf("%s check failed: %w", checker.Name(), err)
		}
	}
	return nil
}