/*
Copyright 2022 The Karmada Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package interpret

import (
	"context"
	"fmt"
	"strings"
	"time"

	"k8s.io/cli-runtime/pkg/printers"
	"k8s.io/cli-runtime/pkg/resource"
	cmdutil "k8s.io/kubectl/pkg/cmd/util"

	"github.com/karmada-io/karmada/pkg/resourceinterpreter/customized/declarative/luavm"
)

func (o *Options) runCheck() error {
	w := printers.GetNewTabWriter(o.Out)
	defer w.Flush()

	failed := false

	err := o.CustomizationResult.Visit(func(info *resource.Info, _ error) error {
		var visitErr error
		fmt.Fprintln(w, "-----------------------------------")

		source := info.Source
		if info.Name != "" {
			source = info.Name
		}
		fmt.Fprintf(w, "SOURCE: %s\n", source)

		customization, visitErr := asResourceInterpreterCustomization(info.Object)
		if visitErr != nil {
			failed = true
			fmt.Fprintf(w, "%v\n", visitErr)
			return nil
		}

		kind := customization.Spec.Target.Kind
		if kind == "" {
			failed = true
			fmt.Fprintln(w, "target.kind no set")
			return nil
		}
		apiVersion := customization.Spec.Target.APIVersion
		if apiVersion == "" {
			failed = true
			fmt.Fprintln(w, "target.apiVersion no set")
			return nil
		}

		fmt.Fprintf(w, "TARGET: %s %s\t\n", apiVersion, kind)
		fmt.Fprintf(w, "RULERS:\n")
		for _, r := range o.Rules {
			fmt.Fprintf(w, "    %s:\t", r.Name())

			script := r.GetScript(customization)
			if script == "" {
				fmt.Fprintln(w, "UNSET")
				continue
			}
			checkErr := checkScript(script)
			if checkErr != nil {
				failed = true
				fmt.Fprintf(w, "%s: %s\t\n", "ERROR", strings.TrimSpace(checkErr.Error()))
				continue
			}

			fmt.Fprintln(w, "PASS")
		}
		return nil
	})
	if err != nil {
		return err
	}
	if failed {
		// As failed infos are printed above. So don't print it again.
		return cmdutil.ErrExit
	}
	return nil
}

func checkScript(script string) error {
	ctx, cancel := context.WithTimeout(context.TODO(), time.Second)
	defer cancel()
	l, err := luavm.NewWithContext(ctx)
	if err != nil {
		return err
	}
	defer l.Close()
	_, err = l.LoadString(script)
	return err
}