package server

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

	appShared "git.nevets.tech/Steven/certman/app/shared"
	"git.nevets.tech/Steven/certman/common"
	"git.nevets.tech/Steven/certman/server"
	"github.com/go-git/go-billy/v5/memfs"
	"github.com/go-git/go-git/v5/storage/memory"
)

type Daemon struct {
	ACMEManager *server.ACMEManager
	TickMu      sync.Mutex
	MgrMu       sync.Mutex
}

func (d *Daemon) loadACMEManager() error {
	d.MgrMu.Lock()
	defer d.MgrMu.Unlock()

	if d.ACMEManager == nil {
		var err error
		d.ACMEManager, err = server.NewACMEManager(appShared.Config())
		if err != nil {
			return err
		}
	}
	return nil
}

func (d *Daemon) Init() {
	fmt.Println("Starting CertManager in server mode...")
	err := appShared.LoadDomainConfigs()
	if err != nil {
		log.Fatalf("Error loading domain configs: %v", err)
	}

	d.Tick()
}

func (d *Daemon) Tick() {
	d.TickMu.Lock()
	defer d.TickMu.Unlock()
	fmt.Println("Tick!")

	if err := d.loadACMEManager(); err != nil {
		fmt.Printf("Error getting acme manager: %v\n", err)
		return
	}

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

	config := appShared.Config()
	localDomainConfigs := appShared.DomainStore().Snapshot()

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

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

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

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

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

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

			err = common.AddAndPushCerts(domainStr, gitWorkspace, config, domainConfig)
			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)
		}
	}
	if err := appShared.SaveDomainConfigs(); err != nil {
		fmt.Printf("Error saving domain configs: %v\n", err)
	}
}

func (d *Daemon) Reload() {
	fmt.Println("Reloading configs...")
	err := appShared.LoadDomainConfigs()

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

	d.MgrMu.Lock()
	d.ACMEManager = nil
	d.MgrMu.Unlock()

	fmt.Println("Successfully reloaded configs")
}

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