package logging

import (
	"io"
	"log/slog"
	"os"
)

// Setup initializes the global structured JSON logger.
// It replaces the default slog handler with a JSON handler writing to stdout.
func Setup() {
	handler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
		Level: slog.LevelInfo,
	})
	slog.SetDefault(slog.New(handler))
}

// SetupWithWriter initializes the global structured JSON logger writing to the given writer.
func SetupWithWriter(w io.Writer) {
	handler := slog.NewJSONHandler(w, &slog.HandlerOptions{
		Level: slog.LevelInfo,
	})
	slog.SetDefault(slog.New(handler))
}

// DeployContext returns a logger enriched with deploy-specific attributes.
func DeployContext(project, stage, tag, instanceID string) *slog.Logger {
	return slog.With(
		slog.String("project", project),
		slog.String("stage", stage),
		slog.String("tag", tag),
		slog.String("instance_id", instanceID),
	)
}