package main

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

	"github.com/b1tsblog/ai-disclosure-standard/internal/app"
)

func main() {
	if len(os.Args) > 1 && os.Args[1] == "--healthcheck" {
		url := os.Getenv("HEALTHCHECK_URL")
		if url == "" {
			url = "http://127.0.0.1:8080/healthz"
		}
		client := &http.Client{Timeout: 2 * time.Second}
		resp, err := client.Get(url)
		if err != nil || resp.StatusCode != http.StatusOK {
			os.Exit(1)
		}
		_ = resp.Body.Close()
		return
	}

	logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelInfo}))
	cfg := app.ConfigFromEnv()
	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	handler, err := app.New(ctx, cfg, logger)
	if err != nil {
		logger.Error("application initialization failed", "error", err)
		os.Exit(1)
	}

	server := &http.Server{
		Addr:              cfg.ListenAddress,
		Handler:           handler,
		ReadHeaderTimeout: 5 * time.Second,
		ReadTimeout:       10 * time.Second,
		WriteTimeout:      15 * time.Second,
		IdleTimeout:       60 * time.Second,
		MaxHeaderBytes:    1 << 20,
	}

	go func() {
		logger.Info("server started", "address", cfg.ListenAddress, "base_url", cfg.BaseURL)
		if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			logger.Error("server failed", "error", err)
			os.Exit(1)
		}
	}()

	<-ctx.Done()
	logger.Info("shutdown requested")

	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := server.Shutdown(shutdownCtx); err != nil {
		logger.Error("graceful shutdown failed", "error", err)
		os.Exit(1)
	}
	logger.Info("server stopped")
}