package setup

import (
	"fmt"
	"os"
	"strings"

	"charm.land/huh/v2"
	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/config"
	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/netbox"
)

// configureInstances edits a copy; nothing is written until the whole wizard succeeds.
func configureInstances(cfg *config.Config) ([]config.NetBoxConfig, error) {
	sources := append([]config.NetBoxConfig(nil), cfg.NetBoxes...)
	if len(sources) == 0 && cfg.NetBox.URL != "" {
		source := cfg.NetBox
		source.Name = "default"
		sources = append(sources, source)
	}
	for {
		if len(sources) == 0 {
			source, err := editInstance(config.NetBoxConfig{Name: "default"}, sources, "")
			if err != nil {
				return nil, err
			}
			sources = append(sources, source)
		}
		action := "done"
		var options []huh.Option[string]
		for _, source := range sources {
			options = append(options, huh.NewOption("Edit "+source.Name+" ("+source.URL+")", "edit:"+source.Name))
			options = append(options, huh.NewOption("Remove "+source.Name, "remove:"+source.Name))
		}
		options = append(options, huh.NewOption("Add another NetBox", "add"), huh.NewOption("Continue with these instances", "done"))
		err := huh.NewForm(huh.NewGroup(huh.NewSelect[string]().Title("NetBox instances").Description("All configured instances are searched together.").Options(options...).Value(&action))).Run()
		if err != nil {
			return nil, err
		}
		if action == "done" {
			return sources, nil
		}
		if action == "add" {
			source, err := editInstance(config.NetBoxConfig{}, sources, "")
			if err != nil {
				return nil, err
			}
			sources = append(sources, source)
			continue
		}
		verb, name, _ := strings.Cut(action, ":")
		for i, source := range sources {
			if source.Name != name {
				continue
			}
			if verb == "edit" {
				edited, err := editInstance(source, sources, name)
				if err != nil {
					return nil, err
				}
				sources[i] = edited
			} else {
				remove := false
				if err := huh.NewConfirm().Title("Remove " + name + "?").Value(&remove).Run(); err != nil {
					return nil, err
				}
				if remove {
					sources = append(sources[:i], sources[i+1:]...)
				}
			}
			break
		}
	}
}

func editInstance(source config.NetBoxConfig, sources []config.NetBoxConfig, original string) (config.NetBoxConfig, error) {
	err := huh.NewForm(huh.NewGroup(
		huh.NewInput().Title("Instance name").Description("Used in selectors such as office/web01.").Value(&source.Name).Validate(func(name string) error {
			name = strings.ToLower(strings.TrimSpace(name))
			candidate := config.Config{NetBoxes: []config.NetBoxConfig{{Name: name, URL: "https://example.invalid"}}}
			if err := candidate.ValidateNetBoxes(); err != nil {
				return err
			}
			for _, existing := range sources {
				if strings.EqualFold(existing.Name, name) && !strings.EqualFold(existing.Name, original) {
					return fmt.Errorf("instance name %q is already used", name)
				}
			}
			return nil
		}),
		huh.NewInput().Title("NetBox URL").Placeholder("https://netbox.example.com").Value(&source.URL).Validate(func(value string) error {
			return (&config.Config{NetBoxes: []config.NetBoxConfig{{Name: "instance", URL: strings.TrimSpace(value)}}}).ValidateNetBoxes()
		}),
		huh.NewInput().Title("NetBox API token").EchoMode(huh.EchoModePassword).Value(&source.Token).Validate(func(value string) error {
			if strings.TrimSpace(value) == "" {
				return fmt.Errorf("required")
			}
			return nil
		}),
	).Title("NetBox connection")).Run()
	if err != nil {
		return source, err
	}
	source.Name = strings.ToLower(strings.TrimSpace(source.Name))
	source.URL = strings.TrimRight(strings.TrimSpace(source.URL), "/")
	source.Token = strings.TrimSpace(source.Token)
	source.TokenVersion = netbox.TokenVersion(source.Token)
	if source.TokenVersion == 1 {
		fmt.Fprintf(os.Stderr, "Note: NetBox %s uses a legacy v1 token. A v2 token starts with nbt_.\n", source.Name)
	}
	return source, nil
}