// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 get

import (
	"encoding/json"
	"fmt"
	"github.com/apache/doris-operator/pkg/common/cmd/templates"
	cmdtypes "github.com/apache/doris-operator/pkg/common/cmd/types"
	"github.com/apache/doris-operator/pkg/common/cmd/util"
	"github.com/spf13/cobra"
	"github.com/tidwall/gjson"
	"io"
	"strings"
)

// GetOptions contains the input to the get command.
type GetOptions struct {
	out          io.Writer
	CmdParent    string
	dc           *cmdutil.DorisConfig
	OutputFormat string
}

// NewGetOptions returns  GetOptions.
func NewGetOptions(parent string, dc *cmdutil.DorisConfig, out io.Writer) *GetOptions {
	return &GetOptions{
		CmdParent: parent,
		out:       out,
		dc:        dc,
	}
}

// Run performs the get operation from doris.
func (o *GetOptions) Run(args []string) {
	if len(args) != 2 {
		fmt.Fprintf(o.out, "You must specify the type of resource to get. %s\n", cmdutil.SuggestAPIResources(o.CmdParent))
		return
	}

	metaType := args[0]
	node := args[1]
	switch metaType {
	case "node":
		o.getNode(node)
		return
	case "computegroup":

	default:
		fmt.Fprintf(o.out, "The type %s not supported.\n", metaType)
		return
	}
}

func (o *GetOptions) getComputeGroup(computeGroupName string) {

}

// getNode get the node details information.
func (o *GetOptions) getNode(node string) {
	c, err := cmdutil.NewDorisClient(o.dc)
	if err != nil {
		fmt.Fprintf(o.out, "%s\n", err.Error())
		return
	}

	frontends, err := c.ShowFrontends()
	if err != nil {
		fmt.Fprintf(o.out, "%s\n", err.Error())
		return
	}
	for _, f := range frontends {
		if f.Host == node {
			o.print(f)
			return
		}
	}

	backends, err := c.ShowBackends()
	if err != nil {
		fmt.Fprintf(o.out, "%s\n", err.Error())
		return
	}

	for _, b := range backends {
		if b.Host == node {
			o.print(b)
			return
		}
	}
}

func (o *GetOptions) print(i interface{}) {
	bytes, err := json.Marshal(i)
	if err != nil {
		fmt.Fprintf(o.out, "%s\n", err.Error())
		return
	}

	if strings.Contains(o.OutputFormat, "custom-columns") {
		a := strings.Split(o.OutputFormat, "=")
		if len(a) != 2 {
			fmt.Fprintf(o.out, "custom-columns not follow the format \"custom-columns=tags.compute_group_name\"%s\n", o.OutputFormat)
			return
		}

		column := a[1]
		//the tag is string, unmarshal to struct.
		if strings.Contains(column, "tag") {
			b := i.(*cmdtypes.Backend)
			tv := b.Tag
			var t cmdtypes.Tag
			err := json.Unmarshal([]byte(tv), &t)
			if err != nil {
				fmt.Fprintf(o.out, "unmarshal tag failed,%s\n", err.Error())
				return
			}
			subColumn, _ := strings.CutPrefix(column, "tag.")
			if subColumn != "" {
				t_str, _ := json.Marshal(&t)
				subV := gjson.GetBytes(t_str, subColumn)
				fmt.Fprintf(o.out, "%s\n", subV)
				return
			}
		} else {
			v := gjson.GetBytes(bytes, column)
			fmt.Fprintf(o.out, "%s\n", v.String())
		}
		return
	}

	f_bytes, err := json.MarshalIndent(i, "", "    ")
	if err != nil {
		fmt.Fprintf(o.out, "%s\n", err.Error())
		return
	}
	fmt.Fprintf(o.out, "%s\n", f_bytes)
}

var (
	getLong = templates.LongDesc(`
        Display one or many resource's meta information.

        Prints a table of the most information  about the specified resources. 
    `)

	getExample = templates.Examples(`
        # get compute group name.
        dorisctl get backend xxx  -o custom-columns=tags.compute_group_name
    `)
)

// NewCmdGet creates a command object for the generic "get" action.
func NewCmdGet(parent string, dc *cmdutil.DorisConfig, out io.Writer) *cobra.Command {
	o := NewGetOptions(parent, dc, out)
	cmd := &cobra.Command{
		Use:                   fmt.Sprintf("get [(-o|--output=)%s] (TYPE[.GROUP][.VERSION] [NAME| -l label]) [flags]", "json|yaml"),
		DisableFlagsInUseLine: true,
		Short:                 "Display one or many resources.",
		Long:                  getLong + "\n\n" + cmdutil.SuggestAPIResources(parent),
		Example:               getExample,
		Run: func(_ *cobra.Command, args []string) {
			o.Run(args)
		},
	}

	cmd.Flags().StringVarP(&o.OutputFormat, "output", "o", o.OutputFormat, "output format.")

	return cmd
}
