package log

import (
	"context"
	"errors"
	"log/slog"
)

type MultiHandler struct {
	handlers []slog.Handler
}

func NewMultiHandler(handlers ...slog.Handler) slog.Handler {
	return &MultiHandler{handlers}
}

func (h *MultiHandler) Enabled(ctx context.Context, level slog.Level) bool {
	for _, handler := range h.handlers {
		if handler.Enabled(ctx, level) {
			return true
		}
	}
	return false
}

func (h *MultiHandler) Handle(ctx context.Context, record slog.Record) error {
	var errs []error
	for _, handler := range h.handlers {
		if handler.Enabled(ctx, record.Level) {
			ex := handler.Handle(ctx, record)
			if ex != nil {
				errs = append(errs, ex)
			}
		}
	}
	if len(errs) > 0 {
		return errors.Join(errs...)
	}
	return nil
}

func (h *MultiHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
	handlers := make([]slog.Handler, len(h.handlers))
	for i, handler := range h.handlers {
		handlers[i] = handler.WithAttrs(attrs)
	}
	return &MultiHandler{
		handlers: handlers,
	}
}

func (h *MultiHandler) WithGroup(name string) slog.Handler {
	handlers := make([]slog.Handler, len(h.handlers))
	for i, handler := range h.handlers {
		handlers[i] = handler.WithGroup(name)
	}
	return &MultiHandler{
		handlers: handlers,
	}
}