// Command api serves the TravelHub multi-tenant flight booking API.
package main

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

	"github.com/travelswitch/travelhub/backend/internal/config"
	"github.com/travelswitch/travelhub/backend/internal/database"
	"github.com/travelswitch/travelhub/backend/internal/handlers"
	"github.com/travelswitch/travelhub/backend/internal/httpapi"
	"github.com/travelswitch/travelhub/backend/internal/repository"
)

func main() {
	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
		Level: slog.LevelInfo,
	}))

	if err := run(logger); err != nil {
		logger.Error("fatal", "error", err)
		os.Exit(1)
	}
}

func run(logger *slog.Logger) error {
	cfg, err := config.Load()
	if err != nil {
		return err
	}

	// Interrupt cancels this context, which unwinds both the pool and the
	// server below.
	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
	defer stop()

	pool, err := database.Connect(ctx, cfg.DatabaseURL)
	if err != nil {
		return err
	}
	defer pool.Close()
	logger.Info("connected to postgres")

	repo := repository.New(pool)
	h := handlers.New(repo, logger)

	srv := &http.Server{
		Addr:              ":" + cfg.Port,
		Handler:           httpapi.New(h, repo, logger, cfg.CORSOrigins),
		ReadHeaderTimeout: 10 * time.Second,
		ReadTimeout:       30 * time.Second,
		WriteTimeout:      30 * time.Second,
		IdleTimeout:       60 * time.Second,
	}

	errCh := make(chan error, 1)
	go func() {
		logger.Info("listening", "addr", srv.Addr, "cors", cfg.CORSOrigins)
		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			errCh <- err
		}
	}()

	select {
	case err := <-errCh:
		return err
	case <-ctx.Done():
		logger.Info("shutting down")
	}

	shutdownCtx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
	defer cancel()
	return srv.Shutdown(shutdownCtx)
}