package main

import (
	"context"
	"errors"
	"fmt"
	"log/slog"
	"net/http"
	"os"
	"os/signal"
	"strconv"
	"syscall"
	"time"

	"data-terminal-cloud/internal/mockprovider"
)

func main() {
	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
	defer stop()
	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil)).With("service", "mock-provider")
	if err := run(ctx, logger); err != nil {
		logger.Error("mock provider stopped", "error", err)
		os.Exit(1)
	}
}

func run(ctx context.Context, logger *slog.Logger) error {
	duplicates, err := strconv.Atoi(env("MOCK_PROVIDER_DUPLICATE_CALLBACKS", "2"))
	if err != nil {
		return fmt.Errorf("invalid duplicate callback count: %w", err)
	}
	delay, err := time.ParseDuration(env("MOCK_PROVIDER_START_DELAY", "100ms"))
	if err != nil {
		return fmt.Errorf("invalid start delay: %w", err)
	}
	provider, err := mockprovider.New(mockprovider.Options{
		APIKey:         env("MOCK_PROVIDER_API_KEY", "local-mock-provider-key"),
		CallbackURL:    env("MOCK_PROVIDER_CALLBACK_URL", "http://localhost:58081/callbacks/v1/vertc/voice-chat"),
		CallbackSecret: env("PROVIDER_CALLBACK_SECRET", "local-provider-callback-secret-32-bytes-minimum"),
		StartDelay:     delay, DuplicateCallbacks: duplicates,
	}, logger)
	if err != nil {
		return fmt.Errorf("create mock provider: %w", err)
	}
	server := &http.Server{
		Addr: env("HTTP_ADDR", "0.0.0.0:59200"), Handler: provider.Handler(),
		ReadHeaderTimeout: 5 * time.Second, ReadTimeout: 10 * time.Second,
		WriteTimeout: 10 * time.Second, IdleTimeout: 30 * time.Second,
	}
	serverError := make(chan error, 1)
	go func() {
		logger.Info("mock provider listening", "address", server.Addr)
		serverError <- server.ListenAndServe()
	}()
	select {
	case <-ctx.Done():
		shutdownContext, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		if err := server.Shutdown(shutdownContext); err != nil {
			return fmt.Errorf("shutdown mock provider: %w", err)
		}
	case err := <-serverError:
		if err != nil && !errors.Is(err, http.ErrServerClosed) {
			return err
		}
	}
	return nil
}

func env(key, fallback string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	return fallback
}