package internal

import (
	"errors"
	"fmt"
	"os"
	"strings"

	"coopcloud.tech/abra/pkg/app"
	"coopcloud.tech/abra/pkg/config"
	"coopcloud.tech/abra/pkg/recipe"
	"coopcloud.tech/abra/pkg/ssh"
	"github.com/AlecAivazis/survey/v2"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli"
)

// AppName is used for configuring app name programmatically
var AppName string

// ValidateRecipe ensures the recipe arg is valid.
func ValidateRecipe(c *cli.Context) recipe.Recipe {
	recipeName := c.Args().First()

	if recipeName == "" {
		ShowSubcommandHelpAndError(c, errors.New("no recipe name provided"))
	}

	chosenRecipe, err := recipe.Get(recipeName)
	if err != nil {
		if c.Command.Name == "generate" {
			if strings.Contains(err.Error(), "missing a compose") {
				logrus.Fatal(err)
			}
			logrus.Warn(err)
		} else {
			logrus.Fatal(err)
		}
	}

	logrus.Debugf("validated %s as recipe argument", recipeName)

	return chosenRecipe
}

// ValidateRecipeWithPrompt ensures a recipe argument is present before
// validating, asking for input if required.
func ValidateRecipeWithPrompt(c *cli.Context) recipe.Recipe {
	recipeName := c.Args().First()

	if recipeName == "" && !NoInput {
		var recipes []string

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

		knownRecipes := make(map[string]bool)
		for name := range catl {
			knownRecipes[name] = true
		}

		localRecipes, err := recipe.GetRecipesLocal()
		if err != nil {
			logrus.Fatal(err)
		}

		for _, recipeLocal := range localRecipes {
			if _, ok := knownRecipes[recipeLocal]; !ok {
				knownRecipes[recipeLocal] = true
			}
		}

		for recipeName := range knownRecipes {
			recipes = append(recipes, recipeName)
		}

		prompt := &survey.Select{
			Message: "Select recipe",
			Options: recipes,
		}
		if err := survey.AskOne(prompt, &recipeName); err != nil {
			logrus.Fatal(err)
		}
	}

	if RecipeName != "" {
		recipeName = RecipeName
		logrus.Debugf("programmatically setting recipe name to %s", recipeName)
	}

	if recipeName == "" {
		ShowSubcommandHelpAndError(c, errors.New("no recipe name provided"))
	}

	chosenRecipe, err := recipe.Get(recipeName)
	if err != nil {
		logrus.Fatal(err)
	}

	logrus.Debugf("validated %s as recipe argument", recipeName)

	return chosenRecipe
}

// ValidateApp ensures the app name arg is valid.
func ValidateApp(c *cli.Context) config.App {
	appName := c.Args().First()

	if AppName != "" {
		appName = AppName
		logrus.Debugf("programmatically setting app name to %s", appName)
	}

	if appName == "" {
		ShowSubcommandHelpAndError(c, errors.New("no app provided"))
	}

	app, err := app.Get(appName)
	if err != nil {
		logrus.Fatal(err)
	}

	if err := recipe.EnsureExists(app.Type); err != nil {
		logrus.Fatal(err)
	}

	if err := ssh.EnsureHostKey(app.Server); err != nil {
		logrus.Fatal(err)
	}

	logrus.Debugf("validated %s as app argument", appName)

	return app
}

// ValidateDomain ensures the domain name arg is valid.
func ValidateDomain(c *cli.Context) (string, error) {
	domainName := c.Args().First()

	if domainName == "" && !NoInput {
		prompt := &survey.Input{
			Message: "Specify a domain name",
			Default: "example.com",
		}
		if err := survey.AskOne(prompt, &domainName); err != nil {
			return domainName, err
		}
	}

	if domainName == "" {
		ShowSubcommandHelpAndError(c, errors.New("no domain provided"))
	}

	logrus.Debugf("validated %s as domain argument", domainName)

	return domainName, nil
}

// ValidateSubCmdFlags ensures flag order conforms to correct order
func ValidateSubCmdFlags(c *cli.Context) bool {
	for argIdx, arg := range c.Args() {
		if !strings.HasPrefix(arg, "--") {
			for _, flag := range c.Args()[argIdx:] {
				if strings.HasPrefix(flag, "--") {
					return false
				}
			}
		}
	}
	return true
}

// ValidateServer ensures the server name arg is valid.
func ValidateServer(c *cli.Context) (string, error) {
	serverName := c.Args().First()

	serverNames, err := config.ReadServerNames()
	if err != nil {
		return serverName, err
	}

	if serverName == "" && !NoInput {
		prompt := &survey.Select{
			Message: "Specify a server name",
			Options: serverNames,
		}
		if err := survey.AskOne(prompt, &serverName); err != nil {
			return serverName, err
		}
	}

	if serverName == "" {
		ShowSubcommandHelpAndError(c, errors.New("no server provided"))
	}

	logrus.Debugf("validated %s as server argument", serverName)

	return serverName, nil
}

// EnsureDNSProvider ensures a DNS provider is chosen.
func EnsureDNSProvider() error {
	if DNSProvider == "" && !NoInput {
		prompt := &survey.Select{
			Message: "Select DNS provider",
			Options: []string{"gandi"},
		}

		if err := survey.AskOne(prompt, &DNSProvider); err != nil {
			return err
		}
	}

	if DNSProvider == "" {
		return fmt.Errorf("missing DNS provider?")
	}

	return nil
}

// EnsureDNSTypeFlag ensures a DNS type flag is present.
func EnsureDNSTypeFlag(c *cli.Context) error {
	if DNSType == "" && !NoInput {
		prompt := &survey.Input{
			Message: "Specify DNS record type",
			Default: "A",
		}
		if err := survey.AskOne(prompt, &DNSType); err != nil {
			return err
		}
	}

	if DNSType == "" {
		ShowSubcommandHelpAndError(c, errors.New("no record type provided"))
	}

	return nil
}

// EnsureDNSNameFlag ensures a DNS name flag is present.
func EnsureDNSNameFlag(c *cli.Context) error {
	if DNSName == "" && !NoInput {
		prompt := &survey.Input{
			Message: "Specify DNS record name",
			Default: "mysubdomain",
		}
		if err := survey.AskOne(prompt, &DNSName); err != nil {
			return err
		}
	}

	if DNSName == "" {
		ShowSubcommandHelpAndError(c, errors.New("no record name provided"))
	}

	return nil
}

// EnsureDNSValueFlag ensures a DNS value flag is present.
func EnsureDNSValueFlag(c *cli.Context) error {
	if DNSValue == "" && !NoInput {
		prompt := &survey.Input{
			Message: "Specify DNS record value",
			Default: "192.168.1.2",
		}
		if err := survey.AskOne(prompt, &DNSValue); err != nil {
			return err
		}
	}

	if DNSValue == "" {
		ShowSubcommandHelpAndError(c, errors.New("no record value provided"))
	}

	return nil
}

// EnsureZoneArgument ensures a zone argument is present.
func EnsureZoneArgument(c *cli.Context) (string, error) {
	zone := c.Args().First()

	if zone == "" && !NoInput {
		prompt := &survey.Input{
			Message: "Specify a domain name zone",
			Default: "example.com",
		}

		if err := survey.AskOne(prompt, &zone); err != nil {
			return zone, err
		}
	}

	if zone == "" {
		ShowSubcommandHelpAndError(c, errors.New("no zone value provided"))
	}

	return zone, nil
}

// EnsureServerProvider ensures a 3rd party server provider is chosen.
func EnsureServerProvider() error {
	if ServerProvider == "" && !NoInput {
		prompt := &survey.Select{
			Message: "Select server provider",
			Options: []string{"capsul", "hetzner-cloud"},
		}

		if err := survey.AskOne(prompt, &ServerProvider); err != nil {
			return err
		}
	}

	if ServerProvider == "" {
		return fmt.Errorf("missing server provider?")
	}

	return nil
}

// EnsureNewCapsulVPSFlags ensure all flags are present.
func EnsureNewCapsulVPSFlags(c *cli.Context) error {
	if CapsulName == "" && !NoInput {
		prompt := &survey.Input{
			Message: "specify capsul name",
		}
		if err := survey.AskOne(prompt, &CapsulName); err != nil {
			return err
		}
	}

	if !NoInput {
		prompt := &survey.Input{
			Message: "specify capsul instance URL",
			Default: CapsulInstanceURL,
		}
		if err := survey.AskOne(prompt, &CapsulInstanceURL); err != nil {
			return err
		}
	}

	if !NoInput {
		prompt := &survey.Input{
			Message: "specify capsul type",
			Default: CapsulType,
		}
		if err := survey.AskOne(prompt, &CapsulType); err != nil {
			return err
		}
	}

	if !NoInput {
		prompt := &survey.Input{
			Message: "specify capsul image",
			Default: CapsulImage,
		}
		if err := survey.AskOne(prompt, &CapsulImage); err != nil {
			return err
		}
	}

	if len(CapsulSSHKeys.Value()) == 0 && !NoInput {
		var sshKeys string
		prompt := &survey.Input{
			Message: "specify capsul SSH keys (e.g. me@foo.com)",
			Default: "",
		}
		if err := survey.AskOne(prompt, &CapsulSSHKeys); err != nil {
			return err
		}
		CapsulSSHKeys = cli.StringSlice(strings.Split(sshKeys, ","))
	}

	if CapsulAPIToken == "" && !NoInput {
		token, ok := os.LookupEnv("CAPSUL_TOKEN")
		if !ok {
			prompt := &survey.Input{
				Message: "specify capsul API token",
			}
			if err := survey.AskOne(prompt, &CapsulAPIToken); err != nil {
				return err
			}
		} else {
			CapsulAPIToken = token
		}
	}

	if CapsulName == "" {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing capsul name?"))
	}
	if CapsulInstanceURL == "" {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing capsul instance url?"))
	}
	if CapsulType == "" {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing capsul type?"))
	}
	if CapsulImage == "" {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing capsul image?"))
	}
	if len(CapsulSSHKeys.Value()) == 0 {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing capsul ssh keys?"))
	}
	if CapsulAPIToken == "" {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing capsul API token?"))
	}

	return nil
}

// EnsureNewHetznerCloudVPSFlags ensure all flags are present.
func EnsureNewHetznerCloudVPSFlags(c *cli.Context) error {
	if HetznerCloudName == "" && !NoInput {
		prompt := &survey.Input{
			Message: "specify hetzner cloud VPS name",
		}
		if err := survey.AskOne(prompt, &HetznerCloudName); err != nil {
			return err
		}
	}

	if !NoInput {
		prompt := &survey.Input{
			Message: "specify hetzner cloud VPS type",
			Default: HetznerCloudType,
		}
		if err := survey.AskOne(prompt, &HetznerCloudType); err != nil {
			return err
		}
	}

	if !NoInput {
		prompt := &survey.Input{
			Message: "specify hetzner cloud VPS image",
			Default: HetznerCloudImage,
		}
		if err := survey.AskOne(prompt, &HetznerCloudImage); err != nil {
			return err
		}
	}

	if len(HetznerCloudSSHKeys.Value()) == 0 && !NoInput {
		var sshKeys string
		prompt := &survey.Input{
			Message: "specify hetzner cloud SSH keys (e.g. me@foo.com)",
			Default: "",
		}
		if err := survey.AskOne(prompt, &sshKeys); err != nil {
			return err
		}
		HetznerCloudSSHKeys = cli.StringSlice(strings.Split(sshKeys, ","))
	}

	if !NoInput {
		prompt := &survey.Input{
			Message: "specify hetzner cloud VPS location",
			Default: HetznerCloudLocation,
		}
		if err := survey.AskOne(prompt, &HetznerCloudLocation); err != nil {
			return err
		}
	}

	if HetznerCloudAPIToken == "" && !NoInput {
		token, ok := os.LookupEnv("HCLOUD_TOKEN")
		if !ok {
			prompt := &survey.Input{
				Message: "specify hetzner cloud API token",
			}
			if err := survey.AskOne(prompt, &HetznerCloudAPIToken); err != nil {
				return err
			}
		} else {
			HetznerCloudAPIToken = token
		}
	}

	if HetznerCloudName == "" {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing hetzner cloud VPS name?"))
	}
	if HetznerCloudType == "" {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing hetzner cloud VPS type?"))
	}
	if HetznerCloudImage == "" {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing hetzner cloud image?"))
	}
	if HetznerCloudLocation == "" {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing hetzner cloud VPS location?"))
	}
	if HetznerCloudAPIToken == "" {
		ShowSubcommandHelpAndError(c, fmt.Errorf("missing hetzner cloud API token?"))
	}

	return nil
}