package app

import (
	"fmt"
	"sort"
	"strings"

	"coopcloud.tech/abra/cli/internal"
	"coopcloud.tech/abra/pkg/config"
	"coopcloud.tech/abra/pkg/formatter"
	"coopcloud.tech/abra/pkg/recipe"
	"coopcloud.tech/abra/pkg/ssh"
	"coopcloud.tech/tagcmp"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli"
)

var status bool
var statusFlag = &cli.BoolFlag{
	Name:        "status, S",
	Usage:       "Show app deployment status",
	Destination: &status,
}

var appType string
var typeFlag = &cli.StringFlag{
	Name:        "type, t",
	Value:       "",
	Usage:       "Show apps of a specific type",
	Destination: &appType,
}

var listAppServer string
var listAppServerFlag = &cli.StringFlag{
	Name:        "server, s",
	Value:       "",
	Usage:       "Show apps of a specific server",
	Destination: &listAppServer,
}

type appStatus struct {
	server  string
	recipe  string
	appName string
	domain  string
	status  string
	version string
	upgrade string
}

type serverStatus struct {
	apps             []appStatus
	appCount         int
	versionCount     int
	unversionedCount int
	latestCount      int
	upgradeCount     int
}

var appListCommand = cli.Command{
	Name:    "list",
	Aliases: []string{"ls"},
	Usage:   "List all managed apps",
	Description: `
This command looks at your local file system listing of apps and servers (e.g.
in ~/.abra/) to generate a report of all your apps.

By passing the "--status/-S" flag, you can query all your servers for the
actual live deployment status. Depending on how many servers you manage, this
can take some time.
	`,
	Flags: []cli.Flag{
		internal.DebugFlag,
		internal.NoInputFlag,
		statusFlag,
		listAppServerFlag,
		typeFlag,
	},
	Before: internal.SubCommandBefore,
	Action: func(c *cli.Context) error {
		appFiles, err := config.LoadAppFiles(listAppServer)
		if err != nil {
			logrus.Fatal(err)
		}

		apps, err := config.GetApps(appFiles)
		if err != nil {
			logrus.Fatal(err)
		}

		sort.Sort(config.ByServerAndType(apps))

		statuses := make(map[string]map[string]string)
		var catl recipe.RecipeCatalogue
		if status {
			alreadySeen := make(map[string]bool)
			for _, app := range apps {
				if _, ok := alreadySeen[app.Server]; !ok {
					if err := ssh.EnsureHostKey(app.Server); err != nil {
						logrus.Fatal(fmt.Sprintf(internal.SSHFailMsg, app.Server))
					}
					alreadySeen[app.Server] = true
				}
			}

			statuses, err = config.GetAppStatuses(appFiles)
			if err != nil {
				logrus.Fatal(err)
			}

			var err error
			catl, err = recipe.ReadRecipeCatalogue()
			if err != nil {
				logrus.Fatal(err)
			}
		}

		var totalServersCount int
		var totalAppsCount int
		allStats := make(map[string]serverStatus)
		for _, app := range apps {
			var stats serverStatus
			var ok bool
			if stats, ok = allStats[app.Server]; !ok {
				stats = serverStatus{}
				if appType == "" {
					// count server, no filtering
					totalServersCount++
				}
			}

			if app.Type == appType || appType == "" {
				if appType != "" {
					// only count server if matches filter
					totalServersCount++
				}

				appStats := appStatus{}
				stats.appCount++
				totalAppsCount++

				if status {
					status := "unknown"
					version := "unknown"
					if statusMeta, ok := statuses[app.StackName()]; ok {
						if currentVersion, exists := statusMeta["version"]; exists {
							version = currentVersion
						}
						if statusMeta["status"] != "" {
							status = statusMeta["status"]
						}
						stats.versionCount++
					} else {
						stats.unversionedCount++
					}

					appStats.status = status
					appStats.version = version

					var newUpdates []string
					if version != "unknown" {
						updates, err := recipe.GetRecipeCatalogueVersions(app.Type, catl)
						if err != nil {
							logrus.Fatal(err)
						}

						parsedVersion, err := tagcmp.Parse(version)
						if err != nil {
							logrus.Fatal(err)
						}

						for _, update := range updates {
							parsedUpdate, err := tagcmp.Parse(update)
							if err != nil {
								logrus.Fatal(err)
							}

							if update != version && parsedUpdate.IsGreaterThan(parsedVersion) {
								newUpdates = append(newUpdates, update)
							}
						}
					}

					if len(newUpdates) == 0 {
						if version == "unknown" {
							appStats.upgrade = "unknown"
						} else {
							appStats.upgrade = "latest"
							stats.latestCount++
						}
					} else {
						newUpdates = internal.ReverseStringList(newUpdates)
						appStats.upgrade = strings.Join(newUpdates, "\n")
						stats.upgradeCount++
					}
				}

				appStats.server = app.Server
				appStats.recipe = app.Type
				appStats.appName = app.Name
				appStats.domain = app.Domain

				stats.apps = append(stats.apps, appStats)
			}

			allStats[app.Server] = stats
		}

		alreadySeen := make(map[string]bool)
		for _, app := range apps {
			if _, ok := alreadySeen[app.Server]; ok {
				continue
			}

			serverStat := allStats[app.Server]

			tableCol := []string{"recipe", "domain", "app name"}
			if status {
				tableCol = append(tableCol, []string{"status", "version", "upgrade"}...)
			}

			table := formatter.CreateTable(tableCol)

			for _, appStat := range serverStat.apps {
				tableRow := []string{appStat.recipe, appStat.domain, appStat.appName}
				if status {
					tableRow = append(tableRow, []string{appStat.status, appStat.version, appStat.upgrade}...)
				}
				table.Append(tableRow)
			}

			if table.NumLines() > 0 {
				table.Render()

				if status {
					fmt.Println(fmt.Sprintf(
						"server: %s | total apps: %v | versioned: %v | unversioned: %v | latest: %v | upgrade: %v",
						app.Server,
						serverStat.appCount,
						serverStat.versionCount,
						serverStat.unversionedCount,
						serverStat.latestCount,
						serverStat.upgradeCount,
					))
				} else {
					fmt.Println(fmt.Sprintf("server: %s | total apps: %v", app.Server, serverStat.appCount))
				}
			}

			if len(allStats) > 1 && table.NumLines() > 0 {
				fmt.Println() // newline separator for multiple servers
			}

			alreadySeen[app.Server] = true
		}

		if len(allStats) > 1 {
			fmt.Println(fmt.Sprintf("total servers: %v | total apps: %v ", totalServersCount, totalAppsCount))
		}

		return nil
	},
}