package server

import (
	"fmt"
	"log"
	"path/filepath"
	"sync"
	"time"

	"git.nevets.tech/Keys/CertManager/internal"
	"github.com/go-git/go-billy/v5/memfs"
	"github.com/go-git/go-git/v5/storage/memory"
)

var (
	tickMu sync.Mutex
	mgr    *internal.ACMEManager
	mgrMu  sync.Mutex
)

func getACMEManager() (*internal.ACMEManager, error) {
	mgrMu.Lock()
	defer mgrMu.Unlock()

	if mgr == nil {
		var err error
		mgr, err = internal.NewACMEManager()
		if err != nil {
			return nil, err
		}
	}
	return mgr, nil
}

func Init() {
	err := internal.LoadDomainConfigs()
	if err != nil {
		log.Fatalf("Error loading domain configs: %v", err)
	}

	Tick()
}

func Tick() {
	tickMu.Lock()
	defer tickMu.Unlock()
	fmt.Println("Tick!")

	var err error
	mgr, err = getACMEManager()
	if err != nil {
		fmt.Printf("Error getting acme manager: %v\n", err)
		return
	}

	now := time.Now().UTC()

	localDomainConfigs := internal.DomainStore().Snapshot()

	for domainStr, domainConfig := range localDomainConfigs {
		if !domainConfig.GetBool("Domain.enabled") {
			continue
		}
		renewPeriod := domainConfig.GetInt("Certificates.renew_period")
		lastIssued := time.Unix(domainConfig.GetInt64("Internal.last_issued"), 0).UTC()
		renewalDue := lastIssued.AddDate(0, 0, renewPeriod)
		if now.After(renewalDue) {
			//TODO extra check if certificate expiry (create cache?)
			_, err = mgr.RenewForDomain(domainStr)
			if err != nil {
				// if no existing cert, obtain instead
				_, err = mgr.ObtainForDomain(domainStr)
				if err != nil {
					fmt.Printf("Error obtaining domain certificates for domain %s: %v\n", domainStr, err)
					continue
				}
			}

			domainConfig.Set("Internal.last_issued", time.Now().UTC().Unix())
			err = internal.WriteDomainConfig(domainConfig)
			if err != nil {
				fmt.Printf("Error saving domain config %s: %v\n", domainStr, err)
				continue
			}

			err = internal.EncryptFileXChaCha(domainConfig.GetString("Certificates.crypto_key"), filepath.Join(mgr.CertsRoot, domainStr, domainStr+".crt"), filepath.Join(mgr.CertsRoot, domainStr, domainStr+".crt.crpt"), nil)
			if err != nil {
				fmt.Printf("Error encrypting domain cert for domain %s: %v\n", domainStr, err)
				continue
			}
			err = internal.EncryptFileXChaCha(domainConfig.GetString("Certificates.crypto_key"), filepath.Join(mgr.CertsRoot, domainStr, domainStr+".key"), filepath.Join(mgr.CertsRoot, domainStr, domainStr+".key.crpt"), nil)
			if err != nil {
				fmt.Printf("Error encrypting domain key for domain %s: %v\n", domainStr, err)
				continue
			}

			giteaClient := internal.CreateGiteaClient()
			if giteaClient == nil {
				fmt.Printf("Error creating gitea client for domain %s: %v\n", domainStr, err)
				continue
			}
			gitWorkspace := &internal.GitWorkspace{
				Storage: memory.NewStorage(),
				FS:      memfs.New(),
			}

			var repoUrl string
			if !domainConfig.GetBool("Internal.repo_exists") {
				repoUrl = internal.CreateGiteaRepo(domainStr, giteaClient)
				if repoUrl == "" {
					fmt.Printf("Error creating Gitea repo for domain %s\n", domainStr)
					continue
				}
				domainConfig.Set("Internal.repo_exists", true)
				err = internal.WriteDomainConfig(domainConfig)
				if err != nil {
					fmt.Printf("Error saving domain config %s: %v\n", domainStr, err)
					continue
				}

				err = internal.InitRepo(repoUrl, gitWorkspace)
				if err != nil {
					fmt.Printf("Error initializing repo for domain %s: %v\n", domainStr, err)
					continue
				}
			} else {
				repoUrl = internal.Config().GetString("Git.server") + "/" + internal.Config().GetString("Git.org_name") + "/" + domainStr + domainConfig.GetString("Repo.repo_suffix") + ".git"
				err = internal.CloneRepo(repoUrl, gitWorkspace, internal.Server)
				if err != nil {
					fmt.Printf("Error cloning repo for domain %s: %v\n", domainStr, err)
					continue
				}
			}

			err = internal.AddAndPushCerts(domainStr, gitWorkspace)
			if err != nil {
				fmt.Printf("Error pushing certificates for domain %s: %v\n", domainStr, err)
				continue
			}
			fmt.Printf("Successfully pushed certificates for domain %s\n", domainStr)
		}
	}
	err = internal.SaveDomainConfigs()
	if err != nil {
		fmt.Printf("Error saving domain configs: %v\n", err)
	}
}

func Reload() {
	fmt.Println("Reloading configs...")
	err := internal.LoadDomainConfigs()

	if err != nil {
		fmt.Printf("Error loading domain configs: %v\n", err)
		return
	}

	mgrMu.Lock()
	mgr = nil
	mgrMu.Unlock()

	fmt.Println("Successfully reloaded configs")
}

func Stop() {
	fmt.Println("Shutting down server")
}