package main

import (
	"context"
	"errors"
	"fmt"
	"net/http"
	"os"
	"os/signal"
	"sync"

	"github.com/charmbracelet/log"
	"github.com/go-gandi/go-gandi/config"
	"gopkg.in/yaml.v2"
)

func loadConfig(filename string) (*Config, error) {
	u := &Config{}
	yamlFile, err := os.ReadFile(filename)
	if err != nil {
		return nil, err
	}
	err = yaml.Unmarshal(yamlFile, u)
	if err != nil {
		return nil, err
	}
	return u, nil
}

func main() {
	ctx, endFn := context.WithCancel(context.Background())
	domain, ok := os.LookupEnv("WATCH_DOMAIN")
	if !ok {
		log.Fatal("no domain specified")
	}
	apikey, ok := os.LookupEnv("WATCH_API")
	if !ok {
		log.Fatal("no Gandi api key")
	}
	port, ok := os.LookupEnv("WATCH_PORT")
	if !ok {
		port = "6283"
	}
	file, ok := os.LookupEnv("WATCH_FILE")
	if !ok {
		file = "./config.yaml"
	}

	debug := os.Getenv("WATCH_DEBUG")
	watchconf, err := loadConfig(file)
	if err != nil {
		log.Fatal(err)
	}

	conf := config.Config{
		APIKey: apikey,
	}

	a := &Tilde{
		debug:  debug != "",
		domain: domain,
		conf:   conf,
	}
	count := 0
	for _, v := range watchconf.Users {
		err := a.Add(&v)
		if err != nil {
			log.Fatal(err, "reg", count)
		}
		count++
	}
	count = 0
	for _, v := range watchconf.Hosts {
		err := a.Add(&v)
		if err != nil {
			log.Fatal(err, "reg", count)
		}
		count++
	}
	server := &http.Server{Addr: fmt.Sprintf("0.0.0.0:%v", port), Handler: a.server()}
	var wg sync.WaitGroup
	c := make(chan os.Signal, 1)
	signal.Notify(c, os.Interrupt)
	go func() {
		<-c
		log.Info("trying to shutdown cleanly")
		endFn()
		err := server.Shutdown(ctx)
		if err != nil {
			log.Warn("error shutting down tilde server", "error", err)
		}
	}()

	wg.Add(1)
	go func() {
		err := server.ListenAndServe()
		if err != nil && !errors.Is(err, http.ErrServerClosed) {
			log.Warn(err)
		}
		wg.Done()
		log.Info("watch web server shutdown")
	}()

	wg.Add(1)
	go func() {
		err := a.run(ctx)
		if err != nil {
			log.Warn("error shutting down update server", "error", err)
		}

		wg.Done()
		log.Info("watch updater shutdown")
	}()
	log.Info("watch running")
	wg.Wait()
	log.Info("shut down")
}