package main

import (
	"context"
	"fmt"
	"github.com/anytypeio/go-anytype-infrastructure-experiments/common/app/logger"
	"github.com/spf13/cobra"
	"go.uber.org/zap"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"sync"
)

var log = logger.NewNamed("cmd.deploy")

type absolutePaths struct {
	configPath       string
	nodePkgPath      string
	nodeBinaryPath   string
	clientPkgPath    string
	clientBinaryPath string
	dbPath           string
	initialPath      string

	nodePkgName   string
	clientPkgName string
}

type appPath struct {
	wdPath     string
	binaryPath string
	configPath string
	logPath    string
}

const (
	anytypeClientBinaryName = "anytype-client"
	anytypeNodeBinaryName   = "anytype-node"
)

var rootCmd = &cobra.Command{
	Use: "deploy",
	PersistentPreRun: func(cmd *cobra.Command, args []string) {
		absolute := absolutePaths{}

		// checking package names
		nodePkgName, err := cmd.Flags().GetString("node-pkg")
		if err != nil {
			log.With(zap.Error(err)).Fatal("node package is not specified")
		}
		absolute.nodePkgName = nodePkgName

		clientPkgName, err := cmd.Flags().GetString("client-pkg")
		if err != nil {
			log.With(zap.Error(err)).Fatal("client package is not specified")
		}
		absolute.clientPkgName = clientPkgName

		// checking configs
		cfgPath, err := cmd.Flags().GetString("config-dir")
		if err != nil {
			log.With(zap.Error(err)).Fatal("no config-dir flag is registered")
		}

		if _, err := os.Stat(cfgPath); os.IsNotExist(err) {
			log.With(zap.Error(err)).Fatal("the config directory doesn't exist")
		}
		absolute.configPath, _ = filepath.Abs(cfgPath)

		// checking node package
		nodePath, err := cmd.Flags().GetString("node-path")
		if err != nil {
			log.With(zap.Error(err)).Fatal("no node-path flag is registered")
		}

		if _, err := os.Stat(path.Join(nodePath, "go.mod")); os.IsNotExist(err) {
			log.With(zap.Error(err)).Fatal("the path to node does not contain a go module")
		}
		absolute.nodePkgPath, _ = filepath.Abs(nodePath)

		// checking client package
		clientPath, err := cmd.Flags().GetString("client-path")
		if err != nil {
			log.With(zap.Error(err)).Fatal("no client-path flag is registered")
		}

		if _, err := os.Stat(path.Join(clientPath, "go.mod")); os.IsNotExist(err) {
			log.With(zap.Error(err)).Fatal("the path to client does not contain a go module")
		}
		absolute.clientPkgPath, _ = filepath.Abs(clientPath)

		// checking binary path
		binaryPath, err := cmd.Flags().GetString("bin")
		if err != nil {
			log.With(zap.Error(err)).Fatal("no bin flag is registered")
		}

		err = createDirectoryIfNotExists(binaryPath)
		if err != nil {
			log.With(zap.Error(err)).Fatal("failed to create directory")
		}
		absoluteBinPath, _ := filepath.Abs(binaryPath)
		absolute.clientBinaryPath = path.Join(absoluteBinPath, anytypeClientBinaryName)
		absolute.nodeBinaryPath = path.Join(absoluteBinPath, anytypeNodeBinaryName)

		// checking db path
		dbPath, err := cmd.Flags().GetString("db-path")
		if err != nil {
			log.With(zap.Error(err)).Fatal("no db-path flag is registered")
		}
		err = createDirectoryIfNotExists(dbPath)
		if err != nil {
			log.With(zap.Error(err)).Fatal("failed to create directory")
		}
		absolute.dbPath, _ = filepath.Abs(dbPath)

		ctx := context.WithValue(context.Background(), "paths", absolute)
		cmd.SetContext(ctx)
	},
}

var buildRunAllCmd = &cobra.Command{
	Use:  "build-and-run",
	Long: "build and then run all clients and nodes",
	Run: func(cmd *cobra.Command, args []string) {
		paths, ok := cmd.Context().Value("paths").(absolutePaths)
		if !ok {
			log.Fatal("did not get context")
		}

		// checking number of nodes to deploy
		numNodes, err := cmd.Flags().GetUint("nodes")
		if err != nil {
			log.With(zap.Error(err)).Fatal("number of nodes is not specified")
		}

		// checking number of clients to deploy
		numClients, err := cmd.Flags().GetUint("clients")
		if err != nil {
			log.With(zap.Error(err)).Fatal("number of clients is not specified")
		}

		// running the script
		err = buildRunAll(paths, numClients, numNodes)
		if err != nil {
			log.With(zap.Error(err)).Fatal("failed to run the command")
		}
	},
}

var buildAllCmd = &cobra.Command{
	Use:  "build-all",
	Long: "builds both the clients and nodes",
	Run: func(cmd *cobra.Command, args []string) {
		paths, ok := cmd.Context().Value("paths").(absolutePaths)
		if !ok {
			log.Fatal("did not get context")
		}

		err := buildAll(paths)
		if err != nil {
			log.With(zap.Error(err)).Fatal("failed to run the command")
			return
		}
	},
}

var runAllCmd = &cobra.Command{
	Use:  "run-all",
	Long: "runs all clients and nodes",
	Run: func(cmd *cobra.Command, args []string) {
		paths, ok := cmd.Context().Value("paths").(absolutePaths)
		if !ok {
			log.Fatal("did not get context")
		}

		// checking number of nodes to deploy
		numNodes, err := cmd.Flags().GetUint("nodes")
		if err != nil {
			log.With(zap.Error(err)).Fatal("number of nodes is not specified")
		}

		// checking number of clients to deploy
		numClients, err := cmd.Flags().GetUint("clients")
		if err != nil {
			log.With(zap.Error(err)).Fatal("number of clients is not specified")
		}

		err = runAll(paths, numClients, numNodes)
		if err != nil {
			log.With(zap.Error(err)).Fatal("failed to run the command")
			return
		}
	},
}

func init() {
	rootCmd.PersistentFlags().String("config-dir", "etc/configs", "generated configs")
	rootCmd.PersistentFlags().String("node-pkg", "github.com/anytypeio/go-anytype-infrastructure-experiments/node/cmd", "node package")
	rootCmd.PersistentFlags().String("client-pkg", "github.com/anytypeio/go-anytype-infrastructure-experiments/client/cmd", "client package")
	rootCmd.PersistentFlags().String("node-path", "node", "path to node go.mod")
	rootCmd.PersistentFlags().String("client-path", "client", "path to client go.mod")
	rootCmd.PersistentFlags().String("bin", "bin", "path to folder where all the binaries are")
	rootCmd.PersistentFlags().String("db-path", "db", "path to folder where the working directories should be placed")

	buildRunAllCmd.Flags().UintP("nodes", "n", 3, "number of nodes to be generated")
	buildRunAllCmd.Flags().UintP("clients", "c", 2, "number of clients to be generated")
	runAllCmd.Flags().UintP("nodes", "n", 3, "number of nodes to be generated")
	runAllCmd.Flags().UintP("clients", "c", 2, "number of clients to be generated")

	rootCmd.AddCommand(buildRunAllCmd)
	rootCmd.AddCommand(buildAllCmd)
	rootCmd.AddCommand(runAllCmd)
}

func main() {
	err := rootCmd.Execute()
	if err != nil {
		log.With(zap.Error(err)).Fatal("failed to execute the command")
	}
}

func createDirectoryIfNotExists(dirPath string) (err error) {
	if _, err = os.Stat(dirPath); !os.IsNotExist(err) {
		return
	}
	return os.Mkdir(dirPath, os.ModePerm)
}

func createAppPaths(paths absolutePaths, binaryPath, appName string, num int) (appPaths []appPath, err error) {
	appTypePath := path.Join(paths.dbPath, appName)
	err = createDirectoryIfNotExists(appTypePath)
	if err != nil {
		return
	}

	for i := 0; i < num; i++ {
		// checking if relevant config exists
		cfgPath := path.Join(paths.configPath, fmt.Sprintf("%s%d.yml", appName, i+1))
		if _, err = os.Stat(cfgPath); os.IsNotExist(err) {
			err = fmt.Errorf("not enough %s configs are generated: %w", appName, err)
			return
		}

		// creating directory for each app
		resPath := path.Join(appTypePath, fmt.Sprintf("%d", i+1))
		err = createDirectoryIfNotExists(resPath)
		if err != nil {
			return
		}

		appPaths = append(appPaths, appPath{
			wdPath:     resPath,
			binaryPath: binaryPath,
			configPath: cfgPath,
			logPath:    path.Join(resPath, "app.log"),
		})
	}
	return
}

func buildRunAll(paths absolutePaths, numClients, numNodes uint) (err error) {
	err = buildAll(paths)
	if err != nil {
		err = fmt.Errorf("failed to build all: %w", err)
		return
	}

	return runAll(paths, numClients, numNodes)
}

func runAll(paths absolutePaths, numClients uint, numNodes uint) (err error) {
	nodePaths, err := createAppPaths(paths, paths.nodeBinaryPath, "node", int(numNodes))
	if err != nil {
		err = fmt.Errorf("failed to create working directories for nodes: %w", err)
		return
	}

	clientPaths, err := createAppPaths(paths, paths.clientBinaryPath, "client", int(numClients))
	if err != nil {
		err = fmt.Errorf("failed to create working directories for clients: %w", err)
		return
	}
	wg := sync.WaitGroup{}
	for _, nodePath := range nodePaths {
		wg.Add(1)
		go func(path appPath) {
			err = runApp(path, &wg)
			if err != nil {
				log.With(zap.Error(err)).Error("running node failed with error")
			}
		}(nodePath)
	}
	for _, clientPath := range clientPaths {
		wg.Add(1)
		go func(path appPath) {
			err = runApp(path, &wg)
			if err != nil {
				log.With(zap.Error(err)).Error("running node failed with error")
			}
		}(clientPath)
	}
	wg.Wait()
	return
}

func buildAll(paths absolutePaths) (err error) {
	err = build(paths.nodePkgPath, paths.nodeBinaryPath, paths.nodePkgName)
	if err != nil {
		err = fmt.Errorf("failed to build node: %w", err)
		return
	}

	err = build(paths.clientPkgPath, paths.clientBinaryPath, paths.clientPkgName)
	if err != nil {
		err = fmt.Errorf("failed to build client: %w", err)
		return
	}
	return
}

func build(dirPath, binaryPath, packageName string) (err error) {
	cmd := exec.Command("go", "build", "-v", "-o", binaryPath, packageName)
	cmd.Dir = dirPath
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	err = cmd.Start()
	if err != nil {
		return
	}
	log.With(zap.String("binary path", binaryPath), zap.String("package name", packageName)).Info("building the app")
	return cmd.Wait()
}

func runApp(app appPath, wg *sync.WaitGroup) (err error) {
	cmd := exec.Command(app.binaryPath, "-c", app.configPath)
	cmd.Dir = app.wdPath
	file, err := os.OpenFile(app.logPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, os.ModePerm)
	if err != nil {
		return
	}
	defer file.Close()
	cmd.Stdout = file
	cmd.Stderr = file
	err = cmd.Start()
	log.With(zap.String("working directory", app.wdPath), zap.String("log path", app.logPath)).Info("running the app")
	if err != nil {
		return
	}

	err = cmd.Wait()
	wg.Done()
	return
}