package commands

import (
	"fmt"
	"io"
	"os"
	"path/filepath"
	"strings"
	"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 mgr *internal.ACMEManager

func RenewCertCmd(domain string, noPush bool, certmanMode internal.CertManMode) error {
	err := internal.LoadConfig()
	if err != nil {
		return err
	}
	err = internal.LoadDomainConfigs()
	if err != nil {
		return err
	}
	switch internal.Config().GetString("App.mode") {
	case "server":
		mgr, err = internal.NewACMEManager()
		if err != nil {
			return err
		}
		err = renewCerts(domain, noPush, certmanMode)
		if err != nil {
			return err
		}
		return ReloadDaemonCmd()
	case "client":
		return pullCerts(domain, certmanMode)
	default:
		return fmt.Errorf("invalid operating mode %s", internal.Config().GetString("App.mode"))
	}
}

func renewCerts(domain string, noPush bool, certmanMode internal.CertManMode) error {
	_, err := mgr.RenewForDomain(domain)
	if err != nil {
		// if no existing cert, obtain instead
		_, err = mgr.ObtainForDomain(domain)
		if err != nil {
			return fmt.Errorf("error obtaining domain certificates for domain %s: %v", domain, err)
		}
	}

	domainConfig, exists := internal.DomainStore().Get(domain)
	if !exists {
		return fmt.Errorf("domain %s does not exist", domain)
	}

	domainConfig.Set("Internal.last_issued", time.Now().UTC().Unix())
	err = internal.WriteDomainConfig(domainConfig)
	if err != nil {
		return fmt.Errorf("error saving domain config %s: %v", domain, err)
	}

	err = internal.EncryptFileXChaCha(domainConfig.GetString("Certificates.crypto_key"), filepath.Join(mgr.CertsRoot, domain, domain+".crt"), filepath.Join(mgr.CertsRoot, domain, domain+".crt.crpt"), nil)
	if err != nil {
		return fmt.Errorf("error encrypting domain cert for domain %s: %v", domain, err)
	}
	err = internal.EncryptFileXChaCha(domainConfig.GetString("Certificates.crypto_key"), filepath.Join(mgr.CertsRoot, domain, domain+".key"), filepath.Join(mgr.CertsRoot, domain, domain+".key.crpt"), nil)
	if err != nil {
		return fmt.Errorf("error encrypting domain key for domain %s: %v", domain, err)
	}

	if !noPush {
		giteaClient := internal.CreateGiteaClient()
		if giteaClient == nil {
			return fmt.Errorf("error creating gitea client for domain %s: %v", domain, err)
		}
		gitWorkspace := &internal.GitWorkspace{
			Storage: memory.NewStorage(),
			FS:      memfs.New(),
		}

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

			err = internal.InitRepo(repoUrl, gitWorkspace)
			if err != nil {
				return fmt.Errorf("error initializing repo for domain %s: %v", domain, err)
			}
		} else {
			repoUrl = internal.Config().GetString("Git.server") + "/" + internal.Config().GetString("Git.org_name") + "/" + domain + domainConfig.GetString("Repo.repo_suffix") + ".git"
			err = internal.CloneRepo(repoUrl, gitWorkspace, certmanMode)
			if err != nil {
				return fmt.Errorf("error cloning repo for domain %s: %v", domain, err)
			}
		}

		err = internal.AddAndPushCerts(domain, gitWorkspace)
		if err != nil {
			return fmt.Errorf("error pushing certificates for domain %s: %v", domain, err)
		}
		fmt.Printf("Successfully pushed certificates for domain %s\n", domain)
	}

	return nil
}

func pullCerts(domain string, certmanMode internal.CertManMode) error {
	gitWorkspace := &internal.GitWorkspace{
		Storage: memory.NewStorage(),
		FS:      memfs.New(),
	}

	domainConfig, exists := internal.DomainStore().Get(domain)
	if !exists {
		return fmt.Errorf("domain %s does not exist", domain)
	}

	// Ex: https://git.example.com/Org/Repo-suffix.git
	// Clones repo and stores in gitWorkspace, skip if clone fails (doesn't exist?)
	repoUrl := internal.Config().GetString("Git.server") + "/" + internal.Config().GetString("Git.org_name") + "/" + domain + domainConfig.GetString("Repo.repo_suffix") + ".git"
	err := internal.CloneRepo(repoUrl, gitWorkspace, certmanMode)
	if err != nil {
		return fmt.Errorf("Error cloning domain repo %s: %v\n", domain, err)
	}

	certsDir, err := internal.DomainCertsDirWConf(domain, domainConfig)
	if err != nil {
		return fmt.Errorf("Error getting certificates dir for domain %s: %v\n", domain, err)
	}

	// Get files in repo
	fileInfos, err := gitWorkspace.FS.ReadDir("/")
	if err != nil {
		return fmt.Errorf("Error reading directory in memFS on domain %s: %v\n", domain, err)
	}
	// Iterate over files, filtering by .crpt (encrypted) files in case other files were accidentally added
	for _, fileInfo := range fileInfos {
		if strings.HasSuffix(fileInfo.Name(), ".crpt") {
			filename, _ := strings.CutSuffix(fileInfo.Name(), ".crpt")
			file, err := gitWorkspace.FS.Open(fileInfo.Name())
			if err != nil {
				fmt.Printf("Error opening file in memFS on domain %s: %v\n", domain, err)
				continue
			}
			fileBytes, err := io.ReadAll(file)
			if err != nil {
				fmt.Printf("Error reading file in memFS on domain %s: %v\n", domain, err)
				file.Close()
				continue
			}
			err = file.Close()
			if err != nil {
				fmt.Printf("Error closing file on domain %s: %v\n", domain, err)
				continue
			}

			err = internal.DecryptFileFromBytes(domainConfig.GetString("Certificates.crypto_key"), fileBytes, filepath.Join(certsDir, filename), nil)
			if err != nil {
				fmt.Printf("Error decrypting file %s in domain %s: %v\n", filename, domain, err)
				continue
			}

			headRef, err := gitWorkspace.Repo.Head()
			if err != nil {
				fmt.Printf("Error getting head reference for domain %s: %v\n", domain, err)
				continue
			}

			err = internal.WriteCommitHash(headRef.Hash().String(), domainConfig)
			if err != nil {
				fmt.Printf("Error writing commit hash: %v\n", err)
				continue
			}

			certLinks := domainConfig.GetStringSlice("Certificates.cert_symlinks")
			for _, certLink := range certLinks {
				if certLink == "" {
					continue
				}
				linkInfo, err := os.Stat(certLink)
				if err != nil {
					if !os.IsNotExist(err) {
						fmt.Printf("Error stating cert link %s: %v\n", certLink, err)
						continue
					}
				}
				if linkInfo.IsDir() {
					certLink = filepath.Join(certLink, domain+".crt")
				}

				err = os.Link(filepath.Join(certsDir, domain+".crt"), certLink)
				if err != nil {
					fmt.Printf("Error linking cert %s to %s: %v\n", certLink, domain, err)
					continue
				}
			}

			keyLinks := domainConfig.GetStringSlice("Certificates.key_symlinks")
			for _, keyLink := range keyLinks {
				if keyLink == "" {
					continue
				}
				linkInfo, err := os.Stat(keyLink)
				if err != nil {
					if !os.IsNotExist(err) {
						fmt.Printf("Error stating key link %s: %v\n", keyLink, err)
						continue
					}
				}
				if linkInfo.IsDir() {
					keyLink = filepath.Join(keyLink, domain+".crt")
				}

				err = os.Link(filepath.Join(certsDir, domain+".crt"), keyLink)
				if err != nil {
					fmt.Printf("Error linking cert %s to %s: %v\n", keyLink, domain, err)
					continue
				}
			}
		}
	}
	return nil
}

func UpdateLinksCmd(domain string) error {
	domainConfig, exists := internal.DomainStore().Get(domain)
	if !exists {
		return fmt.Errorf("domain %s does not exist", domain)
	}

	certsDir, err := internal.DomainCertsDirWConf(domain, domainConfig)
	if err != nil {
		return fmt.Errorf("error getting certificates dir for domain %s: %v", domain, err)
	}

	certLinks := domainConfig.GetStringSlice("Certificates.cert_symlinks")
	for _, certLink := range certLinks {
		err = internal.LinkFile(filepath.Join(certsDir, domain+".crt"), certLink, domain, ".crt")
		if err != nil {
			fmt.Printf("Error linking cert %s to %s: %v", certLink, domain, err)
			continue
		}
	}

	keyLinks := domainConfig.GetStringSlice("Certificates.key_symlinks")
	for _, keyLink := range keyLinks {
		err = internal.LinkFile(filepath.Join(certsDir, domain+".crt"), keyLink, domain, ".key")
		if err != nil {
			fmt.Printf("Error linking cert %s to %s: %v", keyLink, domain, err)
			continue
		}
	}
	return nil
}