package api

import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"coopcloud.tech/abra/pkg/client"
	"coopcloud.tech/abra/pkg/upstream/stack"

	appPkg "coopcloud.tech/abra/pkg/app"
	configPkg "coopcloud.tech/abra/pkg/config"
	deployPkg "coopcloud.tech/abra/pkg/deploy"

	"net/http"

	composetypes "github.com/docker/cli/cli/compose/types"

	"coop-cloud-backend/internal"
)

type abraHandler struct {
	mux *http.ServeMux
}

func newAbraHandler() *abraHandler {
	h := &abraHandler{
		mux: http.NewServeMux(),
	}
	h.mux.HandleFunc("/api/abra/apps", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Methods", "GET, OPTIONS")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
		if r.Method == http.MethodOptions {
			w.WriteHeader(http.StatusOK)
			return
		}
		switch r.Method {
		case http.MethodGet:
			h.handleListApps(w, r)
		default:
			http.Error(w, "Method not implemented", http.StatusMethodNotAllowed)
		}
	})
	h.mux.HandleFunc("/api/abra/apps/{serverId}/{appId}/deploy", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
		if r.Method == http.MethodOptions {
			w.WriteHeader(http.StatusOK)
			return
		}

		switch r.Method {
		case http.MethodPost:
			h.handleDeployApp(w, r, r.PathValue("appId"), r.PathValue("serverId"))
		default:
			http.Error(w, "Method not implemented", http.StatusMethodNotAllowed)
		}
	})
	h.mux.HandleFunc("/api/abra/servers", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Methods", "GET, OPTIONS")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
		if r.Method == http.MethodOptions {
			w.WriteHeader(http.StatusOK)
			return
		}
		switch r.Method {
		case http.MethodGet:
			h.handleListServers(w, r)
		default:
			http.Error(w, "Method not implemented", http.StatusMethodNotAllowed)
		}
	})
	return h
}
func StartAPI() {
	h := newAbraHandler()
	log.Println("Server started on port 3000")
	log.Fatal(http.ListenAndServe(":3000", h))
}

func (h *abraHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// Pre-processing: logging
	log.Printf("Incoming %s request: %s\n", r.Method, r.URL.Path)

	// Delegate to internal mux
	h.mux.ServeHTTP(w, r)
}

// func (h *appHandler) handleStartApp(w http.ResponseWriter, r *http.Request) {
// 	appName := r.PathValue("appName")
// 	w.Write([]byte("starting app: " + appName))

// }

func (h *abraHandler) handleDeployApp(w http.ResponseWriter, r *http.Request, appName string, serverId string) {
	log.Printf("App Id: %s | Server Id: %s", appName, serverId)
	app, err := GetApp(appName)
	if err != nil {
		log.Printf("Error getting app %s: %s\n", appName, err)
		InternalServerErrorHandler(w, r)
		return
	}
	cl, err := client.New(app.Server)
	if err != nil {
		log.Fatal(err)
		InternalServerErrorHandler(w, r)
		return
	}
	deployMeta, err := stack.IsDeployed(context.Background(), cl, app.StackName())
	if err != nil {
		log.Fatal(err)
		InternalServerErrorHandler(w, r)
		return
	}
	if deployMeta.IsDeployed {
		log.Fatalf("%s is already deployed", app.Name)
		InternalServerErrorHandler(w, r)
		return
	}

	// logic differs from CLI, we only want to take either
	// 1. the chaos version
	// 2. TODO: the version in the .env file
	// 3. the latest version
	// we never take: specific CLI verison (maybe will support this) or the deployed version
	internal.Chaos = false
	toDeployVersion, err := getDeployVersion(deployMeta, app)
	if err != nil {
		log.Fatal(err)
		InternalServerErrorHandler(w, r)
		return
	}

	if err := validateSecrets(cl, app); err != nil {
		log.Fatal(err)
		InternalServerErrorHandler(w, r)
		return
	}

	if err := deployPkg.MergeAbraShEnv(app.Recipe, app.Env); err != nil {
		log.Fatal(err)
		InternalServerErrorHandler(w, r)
		return
	}

	composeFiles, err := app.Recipe.GetComposeFiles(app.Env)
	if err != nil {
		log.Fatal(err)
		InternalServerErrorHandler(w, r)
		return
	}

	stackName := app.StackName()
	deployOpts := stack.Deploy{
		Composefiles: composeFiles,
		Namespace:    stackName,
		Prune:        false,
		ResolveImage: stack.ResolveImageAlways,
		Detach:       false,
	}
	compose, err := appPkg.GetAppComposeConfig(app.Name, deployOpts, app.Env)
	if err != nil {
		log.Fatal(err)
		InternalServerErrorHandler(w, r)
		return
	}

	appPkg.SetRecipeLabel(compose, stackName, app.Recipe.Name)
	appPkg.SetChaosLabel(compose, stackName, internal.Chaos)
	if internal.Chaos {
		appPkg.SetChaosVersionLabel(compose, stackName, toDeployVersion)
	}

	versionLabel := toDeployVersion
	if internal.Chaos {
		for _, service := range compose.Services {
			if service.Name == "app" {
				labelKey := fmt.Sprintf("coop-cloud.%s.version", stackName)
				// NOTE(d1): keep non-chaos version labbeling when doing chaos ops
				versionLabel = service.Deploy.Labels[labelKey]
			}
		}
	}
	appPkg.SetVersionLabel(compose, stackName, versionLabel)

	newRecipeWithDeployVersion := fmt.Sprintf("%s:%s", app.Recipe.Name, toDeployVersion)
	appPkg.ExposeAllEnv(stackName, compose, app.Env, newRecipeWithDeployVersion)

	envVars, err := appPkg.CheckEnv(app)
	if err != nil {
		log.Fatal(err)
		InternalServerErrorHandler(w, r)
		return
	}
	// doesn't really get used at all right now
	deployWarnMessages := []string{}
	for _, envVar := range envVars {
		if !envVar.Present {
			deployWarnMessages = append(deployWarnMessages,
				fmt.Sprintf("%s missing from %s.env", envVar.Name, app.Domain),
			)
		}
	}

	//skipping domain checks like crazy
	//commented code is to show deploy overview before deploy

	/*
		deployedVersion := configPkg.MISSING_DEFAULT
		if deployMeta.IsDeployed {
			deployedVersion = deployMeta.Version
			if deployMeta.IsChaos {
				deployedVersion = deployMeta.ChaosVersion
			}
		}
		ShowUnchanged := false
		secretInfo, err := deployPkg.GatherSecretsForDeploy(cl, app, ShowUnchanged)
		if err != nil {
			log.Fatal(err)
			InternalServerErrorHandler(w, r)
			return
		}

		// Gather configs
		configInfo, err := deployPkg.GatherConfigsForDeploy(cl, app, compose, app.Env, ShowUnchanged)
		if err != nil {
			log.Fatal(err)
			InternalServerErrorHandler(w, r)
			return
		}

		// Gather images
		imageInfo, err := deployPkg.GatherImagesForDeploy(cl, app, compose, ShowUnchanged)
		if err != nil {
			log.Fatal(err)
			InternalServerErrorHandler(w, r)
			return
		}*/

	stack.WaitTimeout, err = appPkg.GetTimeoutFromLabel(compose, stackName)
	if err != nil {
		log.Fatal(err)
	}

	serviceNames, err := appPkg.GetAppServiceNames(app.Name)
	if err != nil {
		log.Fatal(err)
	}

	f, err := app.Filters(true, false, serviceNames...)
	if err != nil {
		log.Fatal(err)
	}

	// in future allow user input?
	DontWaitConverge := true
	NoInput := true
	if err := stack.RunDeploy(
		cl,
		deployOpts,
		compose,
		app.Name,
		app.Server,
		DontWaitConverge,
		NoInput,
		f,
	); err != nil {
		log.Fatal(err)
		InternalServerErrorHandler(w, r)
		return
	}

	w.WriteHeader(http.StatusOK)
}
func (h *abraHandler) handleListApps(w http.ResponseWriter, r *http.Request) {
	appNames, err := GetAppNames()
	if err != nil {
		log.Printf("Error getting app names: %s\n", err)
		InternalServerErrorHandler(w, r)
		return
	}
	// counts the number of apps in a server to initialize slices later
	serverAppCount := make(map[string]int)

	remoteApps := make([]appPkg.App, 0, len(appNames))
	for _, appName := range appNames {
		remoteApp, err := GetApp(appName)
		serverAppCount[remoteApp.Server] += 1
		if err != nil {
			log.Printf("Error getting app %s: %s\n", appName, err)
			InternalServerErrorHandler(w, r)
			return
		}
		remoteApps = append(remoteApps, remoteApp)
	}

	appStatuses, err := GetAppStatuses(remoteApps)
	if err != nil {
		log.Printf("GetAppStatuses Falied\n")
		log.Println("Error: ", err)
		InternalServerErrorHandler(w, r)
		return
	}
	abraAppResponse := ServerAppsResponse{}
	for _, app := range remoteApps {
		serverApps, ok := abraAppResponse[app.Server]
		if !ok { // create the slice
			// ever other field initializes to 0
			serverApps = ServerApps{
				Apps: make([]AbraApp, 0, serverAppCount[app.Server]),
			}
		}
		appInfo, ok := appStatuses[app.StackName()]
		if ok {
			log.Printf("app %s is deployed\n", app.Name)
			serverApps.Apps = append(serverApps.Apps, appTranspose(app, appInfo))
			serverApps.AppCount += 1
			// assume these are true rn idk
			serverApps.VersionCount += 1
			serverApps.LatestCount += 1
		} else {
			log.Printf("app %s is undeployed\n", app.Name)
			serverApps.Apps = append(serverApps.Apps, appTransposeUndeployed(app))
			serverApps.AppCount += 1
			// assume these are true rn idk
			serverApps.VersionCount += 1
			serverApps.LatestCount += 1
		}
		abraAppResponse[app.Server] = serverApps
	}
	jsonBytes, err := json.Marshal(abraAppResponse)
	if err != nil {
		log.Printf("Error converting to json: %s\n", err)
		InternalServerErrorHandler(w, r)
		return
	}
	w.WriteHeader(http.StatusOK)
	w.Write(jsonBytes)
}
func appTransposeUndeployed(app appPkg.App) AbraApp {
	config, err := app.Recipe.GetComposeConfig(app.Env)
	if err != nil {
		log.Fatal(err)
	}
	version := GetLabel(config, app.StackName(), "version")
	if version == "" {
		version = "unknown"
	}
	return AbraApp{
		AppName:      app.Name,
		Server:       app.Server,
		Recipe:       app.Recipe.Name,
		Domain:       app.Domain,
		Chaos:        "false",
		Status:       "undeployed",
		ChaosVersion: "unknown",
		Version:      version,
		Upgrade:      "latest",
	}
}
func appTranspose(app appPkg.App, psInfo map[string]string) AbraApp {
	return AbraApp{
		AppName:      app.Name,
		Server:       app.Server,
		Recipe:       app.Recipe.Name,
		Domain:       app.Domain,
		Chaos:        psInfo["chaos"],
		Status:       psInfo["status"],
		ChaosVersion: getOrDefault(psInfo, "chaosVersion", "unknown"),
		Version:      psInfo["version"],
		Upgrade:      "latest",
	}
}

func getOrDefault(m map[string]string, key, def string) string {
	if v, ok := m[key]; ok {
		return v
	}
	return def
}

func (h *abraHandler) handleListServers(w http.ResponseWriter, r *http.Request) {
	servers, err := GetServers()
	if err != nil {
		InternalServerErrorHandler(w, r)
		return
	}
	serverNames, err := ReadServerNames()
	if err != nil {
		InternalServerErrorHandler(w, r)
		return
	}
	abraServers := make([]AbraServer, 0, len(servers))
	for i := range len(servers) {
		abraServers = append(abraServers,
			AbraServer{
				Name: serverNames[i],
				Host: servers[i],
			},
		)
	}
	jsonBytes, err := json.Marshal(abraServers)
	if err != nil {
		InternalServerErrorHandler(w, r)
		return
	}
	w.WriteHeader(http.StatusOK)
	w.Write(jsonBytes)
}
func GetLabel(compose *composetypes.Config, stackName string, label string) string {
	return appPkg.GetLabel(compose, stackName, label)
}

func GetAppStatuses(apps []appPkg.App) (map[string]map[string]string, error) {
	return appPkg.GetAppStatuses(apps, true)
}
func GetApp(appName string) (appPkg.App, error) {
	return appPkg.Get(appName)
}

func GetAppNames() ([]string, error) {
	return appPkg.GetAppNames()
}

func GetAppServiceNames(appName string) ([]string, error) {
	return appPkg.GetAppServiceNames(appName)
}

func GetServers() ([]string, error) {
	return configPkg.GetServers()
}

func ReadServerNames() ([]string, error) {
	return configPkg.ReadServerNames()
}