package cli

import (
	"fmt"
	"net"
	"net/http"
	"time"

	"github.com/spf13/cobra"
)

var (
	webPort int
	webDate string
	webOpen bool
)

func init() {
	webCmd := &cobra.Command{
		Use:   "web",
		Short: "Start local web server with the heat dashboard",
		Long:  "Generates the heat report and serves it via a local HTTP server. Shortcut for 'heatwave report serve'.",
		RunE: func(cmd *cobra.Command, args []string) error {
			dateStr := webDate
			if dateStr == "" {
				dateStr = time.Now().Format("2006-01-02")
			}
			return runWebServer(dateStr, webPort, webOpen)
		},
	}
	webCmd.Flags().IntVar(&webPort, "port", 8080, "HTTP port to serve on")
	webCmd.Flags().StringVar(&webDate, "date", "", "date (YYYY-MM-DD, default: today)")
	webCmd.Flags().BoolVar(&webOpen, "open", true, "open browser automatically")

	rootCmd.AddCommand(webCmd)
}

// runWebServer starts the web server with dashboard + setup UI.
func runWebServer(dateStr string, port int, open bool) error {
	mux := http.NewServeMux()
	registerSetupRoutes(mux, dateStr)

	addr := fmt.Sprintf(":%d", port)
	ln, err := net.Listen("tcp", addr)
	if err != nil {
		return fmt.Errorf("listen %s: %w", addr, err)
	}

	url := fmt.Sprintf("http://localhost:%d", port)
	fmt.Printf("Serving heat dashboard at %s (Ctrl+C to stop)\n", url)

	if open {
		openBrowser(url)
	}

	return http.Serve(ln, mux)
}