package recipe

import (
	"errors"
	"fmt"
	"os"
	"path"
	"path/filepath"
	"sort"
	"strconv"
	"text/template"

	"coopcloud.tech/abra/catalogue"
	"coopcloud.tech/abra/cli/formatter"
	"coopcloud.tech/abra/cli/internal"
	loader "coopcloud.tech/abra/client/stack"
	"coopcloud.tech/abra/config"

	"github.com/docker/cli/cli/command/stack/options"
	"github.com/docker/distribution/reference"
	"github.com/go-git/go-git/v5"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli/v2"
)

var recipeListCommand = &cli.Command{
	Name:    "list",
	Usage:   "List all available recipes",
	Aliases: []string{"ls"},
	Action: func(c *cli.Context) error {
		catl, err := catalogue.ReadAppsCatalogue()
		if err != nil {
			logrus.Fatal(err.Error())
		}
		apps := catl.Flatten()
		sort.Sort(catalogue.ByAppName(apps))
		tableCol := []string{"Name", "Category", "Status"}
		table := formatter.CreateTable(tableCol)
		for _, app := range apps {
			status := fmt.Sprintf("%v", app.Features.Status)
			tableRow := []string{app.Name, app.Category, status}
			table.Append(tableRow)
		}
		table.Render()
		return nil
	},
}

var recipeVersionCommand = &cli.Command{
	Name:      "versions",
	Usage:     "List available versions for <recipe>",
	ArgsUsage: "<recipe>",
	Action: func(c *cli.Context) error {
		recipe := c.Args().First()
		if recipe == "" {
			internal.ShowSubcommandHelpAndError(c, errors.New("no recipe provided"))
		}

		catalogue, err := catalogue.ReadAppsCatalogue()
		if err != nil {
			logrus.Fatal(err)
			return nil
		}

		if app, ok := catalogue[recipe]; ok {
			tableCol := []string{"Version", "Service", "Image", "Digest"}
			table := formatter.CreateTable(tableCol)
			for version := range app.Versions {
				for service := range app.Versions[version] {
					meta := app.Versions[version][service]
					table.Append([]string{version, service, meta.Image, meta.Digest})
				}
			}
			table.SetAutoMergeCells(true)
			table.Render()
			return nil
		}

		logrus.Fatalf("'%s' recipe doesn't exist?", recipe)
		return nil
	},
}

var recipeCreateCommand = &cli.Command{
	Name:      "create",
	Usage:     "Create a new recipe",
	ArgsUsage: "<recipe>",
	Action: func(c *cli.Context) error {
		recipe := c.Args().First()
		if recipe == "" {
			internal.ShowSubcommandHelpAndError(c, errors.New("no recipe provided"))
		}

		directory := path.Join(config.APPS_DIR, recipe)
		if _, err := os.Stat(directory); !os.IsNotExist(err) {
			logrus.Fatalf("'%s' recipe directory already exists?", directory)
			return nil
		}

		url := fmt.Sprintf("%s/example.git", config.REPOS_BASE_URL)
		_, err := git.PlainClone(directory, false, &git.CloneOptions{URL: url, Tags: git.AllTags})
		if err != nil {
			logrus.Fatal(err)
			return nil
		}

		gitRepo := path.Join(config.APPS_DIR, recipe, ".git")
		if err := os.RemoveAll(gitRepo); err != nil {
			logrus.Fatal(err)
			return nil
		}

		toParse := []string{
			path.Join(config.APPS_DIR, recipe, "README.md"),
			path.Join(config.APPS_DIR, recipe, ".env.sample"),
			path.Join(config.APPS_DIR, recipe, ".drone.yml"),
		}
		for _, path := range toParse {
			file, err := os.OpenFile(path, os.O_RDWR, 0755)
			if err != nil {
				logrus.Fatal(err)
				return nil
			}

			tpl, err := template.ParseFiles(path)
			if err != nil {
				logrus.Fatal(err)
				return nil
			}

			// TODO: ask for description and probably other things so that the
			// template repository is more "ready" to go than the current best-guess
			// mode of templating
			if err := tpl.Execute(file, struct {
				Name        string
				Description string
			}{recipe, "TODO"}); err != nil {
				logrus.Fatal(err)
				return nil
			}
		}

		fmt.Printf(
			"New recipe '%s' created in %s, happy hacking!",
			recipe, path.Join(config.APPS_DIR, recipe),
		)

		return nil
	},
}

var recipeLintCommand = &cli.Command{
	Name:      "lint",
	Usage:     "Recipe configuration linter",
	ArgsUsage: "<recipe>",
	Action: func(c *cli.Context) error {
		recipe := c.Args().First()
		if recipe == "" {
			internal.ShowSubcommandHelpAndError(c, errors.New("no recipe provided"))
		}

		pattern := fmt.Sprintf("%s/%s/compose**yml", config.APPS_DIR, recipe)
		composeFiles, err := filepath.Glob(pattern)
		if err != nil {
			logrus.Fatal(err)
		}

		opts := options.Deploy{Composefiles: composeFiles}
		config, err := loader.LoadComposefile(opts)
		if err != nil {
			logrus.Fatal(err)
		}

		expectedVersion := false
		if config.Version == "3.8" {
			expectedVersion = true
		}

		serviceNamedApp := false
		traefikEnabled := false
		healthChecksForAllServices := true
		allImagesTagged := true
		noUnstableTags := true
		for _, service := range config.Services {
			if service.Name == "app" {
				serviceNamedApp = true
			}

			for label := range service.Deploy.Labels {
				if label == "traefik.enable" {
					if service.Deploy.Labels[label] == "true" {
						traefikEnabled = true
					}
				}
			}

			img, err := reference.ParseNormalizedNamed(service.Image)
			if err != nil {
				logrus.Fatal(err)
			}
			if reference.IsNameOnly(img) {
				allImagesTagged = false
			}

			if img.(reference.NamedTagged).Tag() == "latest" {
				noUnstableTags = false
			}

			if service.HealthCheck == nil {
				healthChecksForAllServices = false
			}
		}

		// TODO
		// check for .env.sample

		tableCol := []string{"Rule", "Satisfied"}
		table := formatter.CreateTable(tableCol)
		table.Append([]string{"Compose files have the expected version", strconv.FormatBool(expectedVersion)})
		table.Append([]string{"Recipe contains a service named 'app'", strconv.FormatBool(serviceNamedApp)})
		table.Append([]string{"Traefik routing enabled on at least one service", strconv.FormatBool(traefikEnabled)})
		table.Append([]string{"All services have a healthcheck enabled", strconv.FormatBool(healthChecksForAllServices)})
		table.Append([]string{"All images are using a tag", strconv.FormatBool(allImagesTagged)})
		table.Append([]string{"No usage of unstable 'latest' tags", strconv.FormatBool(noUnstableTags)})
		table.Render()

		return nil
	},
}

// RecipeCommand defines the `abra recipe` command and ets subcommands
var RecipeCommand = &cli.Command{
	Name:  "recipe",
	Usage: "Manage app recipes",
	Description: `
A recipe is a blueprint for an app. It is made up of two things:

- A libre software app (e.g. Nextcloud, Wordpress, Mastodon)
- A package configuration which describes how to deploy and maintain it

Recipes are developed, maintained and extended by the Co-op Cloud volunteer-run
community. Each recipe has a "level" which is intended as a way to quickly show
how reliable this app is to deploy and maintain in its current state.
`,
	Subcommands: []*cli.Command{
		recipeListCommand,
		recipeVersionCommand,
		recipeCreateCommand,
		recipeLintCommand,
	},
}