package main

import (
	"bufio"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"os"
	"os/exec"
	"regexp"
	"slices"
	"strings"
	"sync"
	"time"

	"oc-monitord/conf"
	"oc-monitord/models"
	u "oc-monitord/utils"
	"oc-monitord/workflow_builder"

	oclib "cloud.o-forge.io/core/oc-lib"

	"cloud.o-forge.io/core/oc-lib/logs"
	"cloud.o-forge.io/core/oc-lib/models/booking"
	"cloud.o-forge.io/core/oc-lib/models/peer"
	"cloud.o-forge.io/core/oc-lib/models/utils"
	"cloud.o-forge.io/core/oc-lib/models/workflow_execution"
	"cloud.o-forge.io/core/oc-lib/tools"

	tools2 "oc-monitord/tools"

	"github.com/akamensky/argparse"
	"github.com/google/uuid"
	"github.com/goraz/onion"
	"github.com/rs/zerolog"
)

// Command-line args:
// - url: Loki URL (default: "http://127.0.0.1:3100")
// - execution: Workflow Execution ID (required) to identify the current execution, allows to retrieve Workflow
// - mongo: MongoDB URL (default: "mongodb://127.0.0.1:27017")
// - db: MongoDB database name (default: "DC_myDC")
// - timeout: Execution timeout (default: -1)

var logger zerolog.Logger
var wf_logger zerolog.Logger
var pods_logger zerolog.Logger
var parser argparse.Parser
var workflowName string

const defaultConfigFile = "/etc/oc/ocmonitord_conf.json"
const localConfigFile = "./conf/local_ocmonitord_conf.json"

func main() {

	os.Setenv("test_service", "true") // Only for service demo, delete before merging on main
	parser = *argparse.NewParser("oc-monitord", "Launch the execution of a workflow given as a parameter and sends the produced logs to a loki database")
	loadConfig(false, &parser)
	oclib.InitDaemon("oc-monitord")

	oclib.SetConfig(
		conf.GetConfig().MongoURL,
		conf.GetConfig().Database,
		conf.GetConfig().NatsURL,
		conf.GetConfig().LokiURL,
		conf.GetConfig().Logs,
	)

	logger = logs.CreateLogger("oc-monitord")

	logger.Debug().Msg("Loki URL : " + conf.GetConfig().LokiURL)
	logger.Debug().Msg("Workflow executed : " + conf.GetConfig().ExecutionID)
	exec := u.GetExecution(conf.GetConfig().ExecutionID)
	conf.GetConfig().WorkflowID = exec.WorkflowID

	logger.Debug().Msg("Starting construction of yaml argo for workflow :" + exec.WorkflowID)

	if _, err := os.Stat("./argo_workflows/"); os.IsNotExist(err) {
		os.Mkdir("./argo_workflows/", 0755)
		logger.Info().Msg("Created argo_workflows/")
	}

	// // create argo
	new_wf := workflow_builder.WorflowDB{}

	err := new_wf.LoadFrom(conf.GetConfig().WorkflowID, conf.GetConfig().PeerID)
	if err != nil {

		logger.Error().Msg("Could not retrieve workflow " + conf.GetConfig().WorkflowID + " from oc-catalog API")
	}

	builder, stepMax, err := new_wf.ExportToArgo(exec.ExecutionsID, conf.GetConfig().Timeout)
	if err != nil {
		logger.Error().Msg("Could not create the Argo file for " + conf.GetConfig().WorkflowID)
		logger.Error().Msg(err.Error())
	}

	argo_file_path, err := builder.CompleteBuild(exec.ExecutionsID)
	if err != nil {
		logger.Error().Msg(err.Error())
	}

	workflowName = getContainerName(argo_file_path)

	wf_logger = logger.With().Str("argo_name", workflowName).Str("workflow_id", conf.GetConfig().WorkflowID).Str("workflow_execution_id", conf.GetConfig().ExecutionID).Logger()
	wf_logger.Debug().Msg("Testing argo name")
	_ = stepMax

	if conf.GetConfig().KubeHost == "" {
		// Not in a k8s environment, get conf from parameters
		fmt.Println("Executes outside of k8s")
		executeOutside(argo_file_path, stepMax, builder.Workflow)
	} else {
		// Executed in a k8s environment
		fmt.Println("Executes inside a k8s")
		executeInside(exec.GetID(), "argo", argo_file_path, stepMax)
	}
}

// So far we only log the output from
func executeInside(execID string, ns string, argo_file_path string, stepMax int) {
	t, err := tools2.NewService(conf.GetConfig().Mode)
	if err != nil {
		logger.Error().Msg("Could not create KubernetesTool")
	}
	name, err := t.CreateArgoWorkflow(argo_file_path, ns)
	if err != nil {
		logger.Error().Msg("Could not create argo workflow : " + err.Error())
	} else {
		split := strings.Split(argo_file_path, "_")
		argoLogs := models.NewArgoLogs(split[0], "argo", stepMax)
		argoLogs.StartStepRecording(argoLogs.NewWatch(), wf_logger)
		err := t.LogWorkflow(execID, ns, name, argo_file_path, stepMax, argoLogs.NewWatch(), argoLogs.NewWatch(), argoLogs, []string{}, logWorkflow)
		if err != nil {
			logger.Error().Msg("Could not log workflow : " + err.Error())
		}
	}

}

func executeOutside(argo_file_path string, stepMax int, workflow workflow_builder.Workflow) {
	// var stdoutSubmit, stderrSubmit, stdout_logs, stderr_logs 	io.ReadCloser
	var stdoutSubmit, stderrSubmit io.ReadCloser
	var stdoutLogs, stderrLogs io.ReadCloser
	// var stderr 	io.ReadCloser
	var wg sync.WaitGroup
	var err error

	logger.Debug().Msg("executing :" + "argo submit --watch " + argo_file_path + " --serviceaccount sa-" + conf.GetConfig().ExecutionID + " -n " + conf.GetConfig().ExecutionID )

	cmdSubmit := exec.Command("argo", "submit", "--watch", argo_file_path, "--serviceaccount", "sa-"+conf.GetConfig().ExecutionID, "-n", conf.GetConfig().ExecutionID)
	if stdoutSubmit, err = cmdSubmit.StdoutPipe(); err != nil {
		wf_logger.Error().Msg("Could not retrieve stdoutpipe " + err.Error())
		return
	}

	// //======== Code block that implemented a method that logs both locally and container executed wf
	// // Need to be improved, did not log well for local executions
	// split := strings.Split(argo_file_path, "_")
	// argoLogs := models.NewArgoLogs(split[0], conf.GetConfig().ExecutionID, stepMax)
	// argoLogs.StartStepRecording(argoLogs.NewWatch(), wf_logger)
	// argoLogs.IsStreaming = true	// Used to determine wether or not the logs are read from a docker container or on localhost
	// // go logWorkflow(argo_file_path, stepMax, stdout, argoLogs.NewWatch(), argoLogs.NewWatch(), argoLogs, []string{}, &wg)
	// // =======

	var steps []string
	for _, template := range workflow.Spec.Templates {
		steps = append(steps, template.Name)
	}

	cmdLogs := exec.Command("argo", "logs", "oc-monitor-"+workflowName, "-n", conf.GetConfig().ExecutionID, "--follow","--no-color")
	if stdoutLogs, err = cmdLogs.StdoutPipe(); err != nil {
		wf_logger.Error().Msg("Could not retrieve stdoutpipe for 'argo logs'" + err.Error())
		return
	}

	go models.LogLocalWorkflow(workflowName, stdoutSubmit, &wg)
	go models.LogPods(workflowName, stdoutLogs, steps, &wg)

	fmt.Println("Starting argo submit")
	if err := cmdSubmit.Start(); err != nil {
		wf_logger.Error().Msg("Could not start argo submit")
		wf_logger.Error().Msg(err.Error() + bufio.NewScanner(stderrSubmit).Text())
		updateStatus("fatal", "")
	}

	time.Sleep(5 * time.Second)

	fmt.Println("Running argo logs")
	if err := cmdLogs.Run(); err != nil {
		wf_logger.Error().Msg("Could not run '" + strings.Join(cmdLogs.Args, " ") + "'")
		
		wf_logger.Fatal().Msg(err.Error() + bufio.NewScanner(stderrLogs).Text())

	}

	fmt.Println("Waiting argo submit")
	if err := cmdSubmit.Wait(); err != nil {
		wf_logger.Error().Msg("Could not execute argo submit")
		wf_logger.Error().Msg(err.Error() + bufio.NewScanner(stderrSubmit).Text())
		updateStatus("fatal", "")
	}

	wg.Wait()
}

// !!!! BUGGED !!!!
// Should be refactored to create a function dedicated to logging output from execution in a container
// LogLocalWorkflow() has been implemented to be used when oc-monitord is executed locally

// We could improve this function by creating an object with the same attribute as the output
// and only send a new log if the current object has different values than the previous
func logWorkflow(argo_file_path string, stepMax int, pipe io.ReadCloser,
	current_watch *models.ArgoWatch, previous_watch *models.ArgoWatch,
	argoLogs *models.ArgoLogs, seen []string, wg *sync.WaitGroup) {
	scanner := bufio.NewScanner(pipe)
	count := 0
	see := ""
	seeit := 0
	for scanner.Scan() {
		log := scanner.Text()
		if strings.Contains(log, "capturing logs") && count == 0 {
			if !argoLogs.IsStreaming {
				wg.Add(1)
			}
			seeit++
		} else if count == 0 && !argoLogs.IsStreaming {
			break
		}
		if count == 1 {
			see = log
			if slices.Contains(argoLogs.Seen, see) && !argoLogs.IsStreaming {
				wg.Done()
				seeit--
				break
			}
		}
		if !slices.Contains(current_watch.Logs, log) {
			current_watch.Logs = append(current_watch.Logs, strings.ReplaceAll(log, "\"", ""))
		}
		count++
		if strings.Contains(log, "sub-process exited") || argoLogs.IsStreaming {
			current_watch = argoLogs.StopStepRecording(current_watch)
			argoLogs.Seen = append(argoLogs.Seen, see)
			if checkStatus(current_watch, previous_watch, argoLogs) {
				count = 0
				if !argoLogs.IsStreaming {
					wg.Done()
				}
				seeit--
			}
			jsonified, err := json.Marshal(current_watch)
			if err != nil {
				logger.Error().Msg("Could not create watch log")
			}
			if current_watch.Status == "Failed" {
				wf_logger.Error().Msg(string(jsonified))
			} else {
				wf_logger.Info().Msg(string(jsonified))
			}
			previous_watch = current_watch
			current_watch = &models.ArgoWatch{}
			if argoLogs.IsStreaming {
				current_watch.Logs = []string{}
			}
		}
	}
}

func loadConfig(is_k8s bool, parser *argparse.Parser) {
	var o *onion.Onion
	o = initOnion(o)
	setConf(is_k8s, o, parser)

	// if !IsValidUUID(conf.GetConfig().ExecutionID) {
	// 	logger.Fatal().Msg("Provided ID is not an UUID")
	// }
}

func setConf(is_k8s bool, o *onion.Onion, parser *argparse.Parser) {
	url := parser.String("u", "url", &argparse.Options{Required: true, Default: "http://127.0.0.1:3100", Help: "Url to the Loki database logs will be sent to"})
	mode := parser.String("M", "mode", &argparse.Options{Required: false, Default: "", Help: "Mode of the execution"})
	execution := parser.String("e", "execution", &argparse.Options{Required: true, Help: "Execution ID of the workflow to request from oc-catalog API"})
	peer := parser.String("p", "peer", &argparse.Options{Required: false, Default: "", Help: "Peer ID of the workflow to request from oc-catalog API"})
	mongo := parser.String("m", "mongo", &argparse.Options{Required: true, Default: "mongodb://127.0.0.1:27017", Help: "URL to reach the MongoDB"})
	db := parser.String("d", "database", &argparse.Options{Required: true, Default: "DC_myDC", Help: "Name of the database to query in MongoDB"})
	timeout := parser.Int("t", "timeout", &argparse.Options{Required: false, Default: -1, Help: "Timeout for the execution of the workflow"})

	ca := parser.String("c", "ca", &argparse.Options{Required: false, Default: "", Help: "CA file for the Kubernetes cluster"})
	cert := parser.String("C", "cert", &argparse.Options{Required: false, Default: "", Help: "Cert file for the Kubernetes cluster"})
	data := parser.String("D", "data", &argparse.Options{Required: false, Default: "", Help: "Data file for the Kubernetes cluster"})

	host := parser.String("H", "host", &argparse.Options{Required: false, Default: "", Help: "Host for the Kubernetes cluster"})
	port := parser.String("P", "port", &argparse.Options{Required: false, Default: "6443", Help: "Port for the Kubernetes cluster"})

	err := parser.Parse(os.Args)
	if err != nil {
		fmt.Println(parser.Usage(err))
		os.Exit(1)
	}
	conf.GetConfig().Logs = "debug"
	conf.GetConfig().LokiURL = *url
	conf.GetConfig().MongoURL = *mongo
	conf.GetConfig().Database = *db
	conf.GetConfig().Timeout = *timeout
	conf.GetConfig().Mode = *mode
	conf.GetConfig().ExecutionID = *execution
	conf.GetConfig().PeerID = *peer

	conf.GetConfig().KubeHost = *host
	conf.GetConfig().KubePort = *port

	decoded, err := base64.StdEncoding.DecodeString(*ca)
	if err == nil {
		conf.GetConfig().KubeCA = string(decoded)
	}
	decoded, err = base64.StdEncoding.DecodeString(*cert)
	if err == nil {
		conf.GetConfig().KubeCert = string(decoded)
	}
	decoded, err = base64.StdEncoding.DecodeString(*data)
	if err == nil {
		conf.GetConfig().KubeData = string(decoded)
	}
}

func initOnion(o *onion.Onion) *onion.Onion {
	logger = logs.CreateLogger("oc-monitord")
	configFile := ""

	l3 := onion.NewEnvLayerPrefix("_", "OCMONITORD")
	l2, err := onion.NewFileLayer(defaultConfigFile, nil)
	if err == nil {
		logger.Info().Msg("Config file found : " + defaultConfigFile)
		configFile = defaultConfigFile
	}
	l1, err := onion.NewFileLayer(localConfigFile, nil)
	if err == nil {
		logger.Info().Msg("Local config file found " + localConfigFile + ", overriding default file")
		configFile = localConfigFile
	}
	if configFile == "" {
		logger.Info().Msg("No config file found, using env")
		o = onion.New(l3)
	} else if l1 == nil && l2 == nil {
		o = onion.New(l1, l2, l3)
	} else if l1 == nil {
		o = onion.New(l2, l3)
	} else if l2 == nil {
		o = onion.New(l1, l3)
	}
	return o
}

func IsValidUUID(u string) bool {
	_, err := uuid.Parse(u)
	return err == nil
}

func getContainerName(argo_file string) string {
	regex := "([a-zA-Z]+-[a-zA-Z]+)"
	re := regexp.MustCompile(regex)

	container_name := re.FindString(argo_file)

	return container_name
}

// Uses the ArgoWatch object to update status of the workflow execution object
func checkStatus(current *models.ArgoWatch, previous *models.ArgoWatch, argoLogs *models.ArgoLogs) bool {
	if previous == nil || current.Status != previous.Status || argoLogs.IsStreaming {
		argoLogs.StepCount += 1
		if len(current.Logs) > 0 {
			newLogs := []string{}
			for _, log := range current.Logs {
				if !slices.Contains(argoLogs.Logs, log) {
					newLogs = append(newLogs, log)
				}
			}
			updateStatus(current.Status, strings.Join(newLogs, "\n"))
			current.Logs = newLogs
			argoLogs.Logs = append(argoLogs.Logs, newLogs...)
		} else {
			updateStatus(current.Status, "")
		}
	}
	return previous == nil || current.Status != previous.Status || argoLogs.IsStreaming
}

func updateStatus(status string, log string) {
	exec_id := conf.GetConfig().ExecutionID

	wf_exec := &workflow_execution.WorkflowExecution{AbstractObject: utils.AbstractObject{UUID: conf.GetConfig().ExecutionID}}
	wf_exec.ArgoStatusToState(status)
	exec, _, err := workflow_execution.NewAccessor(&tools.APIRequest{
		PeerID: conf.GetConfig().PeerID,
	}).UpdateOne(wf_exec, exec_id)
	if err != nil {
		logger.Error().Msg("Could not update status for workflow execution " + exec_id + err.Error())
	}
	splitted := strings.Split(log, "-")
	if len(splitted) > 1 {
		we := exec.(*workflow_execution.WorkflowExecution)
		itemID := splitted[len(splitted)-1] // TODO: in logs found item ID
		caller := &tools.HTTPCaller{
			URLS: map[tools.DataType]map[tools.METHOD]string{
				tools.PEER: {
					tools.POST: "/status/",
				},
				tools.BOOKING: {
					tools.PUT: "http://localhost:8080/booking/:id",
				},
			},
		}
		if we.PeerBookByGraph != nil {
			for peerID, val := range we.PeerBookByGraph {
				if val[itemID] == nil {
					continue
				}
				for _, log := range val[itemID] {
					(&peer.Peer{}).LaunchPeerExecution(peerID, log, tools.BOOKING, tools.PUT, &booking.Booking{
						State: we.State,
					}, caller)
				}
			}
		}
	}
}