package sinks

import (
	"context"
	"encoding/json"
	"fmt"

	"gitea.maximumdirect.net/ejr/feedkit/event"
)

type StdoutSink struct{ name string }

func NewStdoutSink(name string) *StdoutSink {
	return &StdoutSink{name: name}
}

func (s *StdoutSink) Name() string { return s.name }

func (s *StdoutSink) Consume(ctx context.Context, e event.Event) error {
	_ = ctx

	// Boundary validation: if something upstream violated invariants,
	// surface it loudly rather than printing partial nonsense.
	if err := e.Validate(); err != nil {
		return fmt.Errorf("stdout sink: invalid event: %w", err)
	}

	// Generic default: one JSON line per event.
	// This makes stdout useful across all domains and easy to pipe into jq / logs.
	b, err := json.Marshal(e)
	if err != nil {
		return fmt.Errorf("stdout sink: marshal event: %w", err)
	}
	fmt.Println(string(b))
	return nil
}