package cli

import (
	"context"
	"flag"
	"strings"

	"github.com/peterbourgon/ff/v3/ffcli"

	dashmgr "edge-infra.dev/pkg/lib/gcp/monitoring/dashboardmanager"
)

type deleteArgsT struct {
	labels string
	name   string
}

var deleteArgs deleteArgsT
var deleteFlagSet = newDeleteFlagSet(&deleteArgs)

func newDeleteFlagSet(deleteArgs *deleteArgsT) *flag.FlagSet {
	deletef := newFlagSet("delete")
	deletef.StringVar(&deleteArgs.labels, "labels", "", "Deletes all dashboards that match the specified label(s). Multiple labels can be specified using a comma between each value.")
	deletef.StringVar(&deleteArgs.name, "name", "", "Dashboard Name or Display Name to delete.\nNOTE: If a Display Name is used and multiple dashboards exist with the same name, all will be deleted.")
	return deletef
}

var deleteCmd = &ffcli.Command{
	Name:       "delete",
	ShortUsage: "delete [flags]",
	ShortHelp:  "Delete dashboard(s) from project",
	LongHelp: strings.TrimSpace(`
Deletes dashboards in the project using either the specified dashboard name, display name, labels.
`),
	FlagSet: withGlobalFlags(deleteFlagSet),
	Exec:    runDelete,
}

func runDelete(ctx context.Context, args []string) error {
	if len(args) > 0 {
		Fatalf("too many non-flag arguments: %q", args)
	}
	if !checkDeleteFlags() {
		Println()
		return flag.ErrHelp
	}

	client, err := dashmgr.New(ctx, projectID)
	if err != nil {
		return err
	}

	// Delete dashboards matching labels
	if len(deleteArgs.labels) > 0 {
		labels := strArray(deleteArgs.labels)
		for i := 0; i < len(labels); i++ {
			err = client.DeleteDashboardsByLabel(labels[i])
			if err != nil {
				return err
			}
		}
		return nil
	}

	// Delete dashboards that match specified name
	if len(deleteArgs.name) > 0 {
		return client.DeleteDashboard(deleteArgs.name)
	}

	return nil
}

// validates the required delete subcommand flags have been provided
func checkDeleteFlags() bool {
	if len(projectID) == 0 {
		Println("Error: no value specified for [project] - a valid project-id is required")
		return false
	}

	if len(deleteArgs.name) == 0 && len(deleteArgs.labels) == 0 {
		Println("Error: no value specified for [name] or [labels] - please provide a value for one of the delete action parameters")
		return false
	}

	if len(deleteArgs.name) > 0 && len(deleteArgs.labels) > 0 {
		Println("Error: values provided for both [name] and [labels] - please specify dashboard [name] or [labels] to perform a delete action on, not both")
	}

	return true
}