package simplelog

import (
	"context"
	"encoding/json"
	"fmt"
	"log/slog"
	"os"
)

// JSONHandler writes each log record to stdout as a JSON document.
type JSONHandler struct{}

// NewJSONHandler returns a new JSONHandler.
func NewJSONHandler() *JSONHandler {
	return &JSONHandler{}
}

// Handle marshals the record to JSON and writes it to stdout.
func (j *JSONHandler) Handle(_ context.Context, record slog.Record) error {
	jsonData, err := json.Marshal(record)
	if err != nil {
		return err
	}

	_, _ = fmt.Fprintln(os.Stdout, string(jsonData))

	return nil
}

// Enabled reports whether the handler processes records at the given
// level; it always returns true.
func (j *JSONHandler) Enabled(_ context.Context, _ slog.Level) bool {
	return true
}

// WithAttrs returns the handler unchanged; attributes are not rendered.
func (j *JSONHandler) WithAttrs(_ []slog.Attr) slog.Handler {
	return j
}

// WithGroup returns the handler unchanged; groups are not rendered.
func (j *JSONHandler) WithGroup(_ string) slog.Handler {
	return j
}