package simplelog

import (
	"context"
	"log"
	"log/slog"
	"os"

	"github.com/mattn/go-isatty"
)

var (
	relpServerURL = os.Getenv("LOGGER_RELP_URL")
	webhookURL    = os.Getenv("LOGGER_WEBHOOK_URL")
)

var ourCustomLogger *slog.Logger
var ourCustomHandler slog.Handler

func init() {
	ourCustomHandler = NewCustomHandler()
	ourCustomLogger = slog.New(ourCustomHandler)
	slog.SetDefault(ourCustomLogger)
}

type CustomHandler struct {
	handlers []ExtendedHandler
}

func NewCustomHandler() slog.Handler {
	cl := &CustomHandler{}
	if isatty.IsTerminal(os.Stdout.Fd()) {
		cl.handlers = append(cl.handlers, NewConsoleHandler())
	} else {
		cl.handlers = append(cl.handlers, NewJSONHandler())
	}
	if relpServerURL != "" {
		handler, err := NewRELPHandler(relpServerURL)
		if err != nil {
			log.Fatalf("Failed to initialize RELP handler: %v", err)
		}
		cl.handlers = append(cl.handlers, handler)
	}
	if webhookURL != "" {
		handler, err := NewWebhookHandler(webhookURL)
		if err != nil {
			log.Fatalf("Failed to initialize Webhook handler: %v", err)
		}
		cl.handlers = append(cl.handlers, handler)
	}
	return cl
}

func (cl *CustomHandler) Handle(ctx context.Context, record slog.Record) error {
	for _, handler := range cl.handlers {
		if err := handler.Handle(ctx, record); err != nil {
			return err
		}
	}
	return nil
}

func (cl *CustomHandler) Enabled(ctx context.Context, level slog.Level) bool {
	// send us all events
	return true
}

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

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